Volatile organic compounds（VOCs）were identified as chemicals that caused odor pollution in cars. Nanostructured water ion（EWNS）technology was demonstrated to be capable of producing large amounts of hydroxyl radicals to degrade VOCs, though systematic research on odor VOC removal had not been conducted. In this study, VOCs components from 9cars were first analyzed offline using TD-GC-MS, and the main odor VOCs in actual car interiors were determined through the comprehensive scoring method. A mixture gas containing the average concentration ratio of detected odor VOCs was then introduced into the experimental vehicle, where degradation efficiency was evaluated using EWNS technology. Human health risk assessment was also performed. The results revealed that aliphatic compounds were detected most frequently（7species）in car interior VOCs, while aromatic compounds were found to have the highest detection rate and concentration. Through odor identification scoring, xylene, toluene, ethyl acetate, o-xylene, n-butanol, and hexanal were selected as representative odor VOCs. After EWNS treatment, significant removal effects were observed for all representative odor VOCs, with toluene removal rate being recorded at 92.8%. However, EWNS degradation efficiency was found to vary with placement locations in the vehicle, where better removal effects were achieved in rear positions compared to front positions, potentially associated with hydroxyl radical diffusion efficiency. Meanwhile, the carcinogenic risks of benzene and ethylbenzene were significantly reduced, transitioning from carcinogenic risk to risk-free status.

Based on the high-density observation network of low-cost CO₂ analyzers deployed in Hangzhou, an analysis of CO₂ concentration spanning a complete one-year from April 2023 to March 2024 was conducted. The results showed that:（1）Under field observation conditions, low-cost instruments experience data gaps, with annual data collection rates at various stations ranging from 38.58% to 99.39%. The Mean Bias Error（MBE）for the two non-dispersive infrared（NDIR）instruments is（3.2±1.4）µmol/mol. Therefore, it is essential to enhance the data collection rate at stations when deploying high-density network.（2）Observation from NDIR-based low-cost instruments were highly sensitive to environmental variations, but could be effectively corrected by machine learning-based calibration schemes. After correction, the correlation coefficient R² between the network data and high-precision observation improved from 0.33 to 0.77, with the MBE of 1.2µmol/mol.（3）The high-density network of low-cost CO₂ analyzers was can effectively capture the spatio-temporal variability of CO₂ concentration. Diurnal variations and spatial distributions across stations reflected seasonal variations characteristics of urban CO₂ sources and sinks. The deployment of this network has demonstrated the feasibility of operating a low-cost, high-density monitoring system in cities with complex underlying surfaces, such as those in China. This approach provided a basis for estimating urban carbon emissions and evaluating the effectiveness of emission reduction measures.

Semi-volatile organic compounds（SVOCs）can be easily adsorbed by indoor surfaces and thus are difficult to be removed by ventilation or air purification. Photocatalytic oxidation technology has bright prospects in the field of indoor air purification, but its performance on removing indoor SVOCs is still unclear. In this study, we found that the commonly-used photocatalyst（P25titanium dioxide）could effectively degrade two typical indoor SVOCs（dibutyl phthalate（DnBP）and tri（2-chloropropyl）phosphate（TCPP））under the irradiation of both a 254 nm ultraviolet lamp and a fluorescent lamp, and the degradation process could be described by the first-order kinetic equation. Under the irradiation of fluorescent lamp, DnBP and TCPP were completely degraded within 120 and 42h, respectively, being significantly faster than the removal rate of ventilation and air purification for these two SVOCs. Furthermore, the degradation products and corresponding pathways of DnBP and TCPP were analyzed by gas chromatography-mass spectrometry coupled with proton transfer reaction time-of-flight mass spectrometer.

In this study, Jiangmen City was selected as a case study to investigate the characteristics and causes of heavy ozone（O₃）pollution days. Positive Matrix Factorization（PMF）and an observation-based model coupled with the CB06chemical mechanism（OBM-CB06）were employed as the analytical methods, integrating pollutant concentrations, meteorological data, photolysis data, and volatile organic compound（VOC）concentrations. The findings showed that heavy ozone pollution in Jiangmen resulted primarily from the early morning accumulation of precursors due to meteorological conditions, followed by enhanced photochemical reactions and poor dispersion after the O₃ concentration peaked. Notably, early morning concentrations of nitrogen oxides（NO_x）and carbon monoxide（CO）in Jiangmen were significantly higher than those in surrounding cities. VOCs source apportionment revealed that mobile sources（29.91% to 31.25%）and liquefied petroleum gas（LPG）usage（28.8% to 30.73%）were the major contributors. O₃ sensitivity analysis demonstrated that O₃ formation in Jiangmen was predominantly NO_x-sensitive under heavy pollution conditions. A 20% reduction in NO_x could effectively prevent heavy pollution, while a further 60% reduction might keep O₃ concentrations within the mild pollution range. The relative incremental reactivity（RIR）of precursors also highlighted the importance of NO_x control during heavy pollution days, as NO_x exhibited the highest RIR values（0.95~0.99）. O₃ budget analysis revealed regional influences. Except at year-end, when stringent control measures effectively reduced regional impacts on heavy pollution days, heavy pollution episodes in other periods were largely influenced by upwind areas, particularly the central PRD region（e.g., Guangzhou-Foshan）. Moreover, the regional contribution generally increased significantly after 15:00 on heavy pollution days, exceeding 60%. To mitigate heavy O₃ pollution in Jiangmen, stricter control of NO_x and other precursor emissions should be enforced. Furthermore, coordinated regional prevention and control measures should be implemented in collaboration with upwind cities, such as Foshan, Zhongshan, and Guangzhou.

This paper studied the characteristics and formation mechanisms of local photochemical pollution in Beijing during summer. Firstly, based on the meteorological observations, we obtained four typical meteorological clusters（M1~M4）based on the meteorological observations by using the K-means clustering algorithm and found the significant O₃ pollution difference among M1~M4. Then, under 2021 emissions of this city, we further simulated the local photochemical evolution of Beijing urban plumes respectively for four meteorological clusters, via a 0-D box model with the MCM（v3.3.1）. The simulation results showed the daytime-averaged net O₃ production rate was 7.91×10^-9（M1）, 7.58×10^-9（M2）, 7.18×10^-9（M3）, 3.55×10^-9（M4）·h^-1, but O₃ formation & loss pathways were very similar. O₃ formation was in the VOCs-limited regime, but its sensitivity to VOCs apparently decreased from M1 to M4. However, the simulated HCHO and CH₃CHO had a little differences between various meteorological conditions, as well as their production rates and formation & loss pathways. The linear response of HCHO to VOCs indicated it could be as the good tracer for VOCs level. Finally, we calculated the O₃ increment reactivity（IR）of 65 VOCs species for each meteorological cluster, and found the differences in IR between low-reactivity and high-reactivity VOCs became significantly smaller under the M1 compared to M4, implying the importance of strengthening the control of low-reactivity components VOCs in on O₃ pollution days.

We chose a petrochemical park in Beijing-Tianjin-Hebei as the research target, and five representative sites were selected for sampling and analysis. 85 volatile organic compounds（VOCs）were detected and their impacts on the environment and health were evaluated. The results showed that the concentration of total volatile organic compounds（TVOCs）were 546.0~4472.2µg/m³, in which alkanes and alkenes were the dominant group, followed by aromatics and halocarbons. Compared with the diurnal variation of VOCs components at each site, the time of peak and valley values appearing were different, and the typical species were different. Additionally, OFP in the synthetic rubber area was the richest（13239.8µg/m³）. The contribution of alkenes to OFP was the highest（62.8%~90.5%）, followed by alkanes（3.8%~34.8%）and aromatics（2.2%~22.1%）. Otherwise, only the synthetic rubber area was polluted by odor, 1,3-butadiene（0.68）and n-hexane（0.30）were the main VOCs species that produced odor. Moreover, the health risk associated with each site was assessed by the US EPA method, indicating that the non-cancer risk of synthetic rubber and cancer risk of oil refining were higher than those of other sites.

The adaptive resilience of microorganisms is crucial for maintaining the stable operation of Biotrickling filters under intermittent flow interruption. This process is intrinsically related to the ability of microorganism to store active substances as Extracellular Polymeric Substances（EPS）. To elucidate this mechanism, a comparative analysis was conducted on biofilm structural characteristics, EPS compositional variations, and functional group transformations during an operation cycle of Biotrickling filters. The correlation between EPS-mediated stress response mechanisms and microbial activity maintenance/recovery was investigated. The results revealed that the removal of COD and NH₄⁺-N reached（95.56±1.10）% and（87.06±2.08）% respectively in the biotrickling filter operated under intermittent flow. Under the regulation of EPS, the biofilm showed a loose and porous structure. During flow interruption phases, microorganisms activated starvation adaptation strategies by converting carbon sources adsorbed in SB-EPS and metabolizing polysaccharides stored in SB-EPS. The structure integrity of microorganisms was maintained via synergistic effects of hydrophobic functional groups within EPS and polymer bridging interactions. Accordingly, an EPS-mediated stress adaptation system responsive to starvation-recovery alternations was established, enabling sustainable operation of Biotrickling filters.

In this study, swine wastewater was treated using constructed wetland-microbial fuel cell（CW-MFC）technology. The pollutant removal efficiency, bioelectricity generation and microbial community structure were evaluated. The results showed that after treated the swine wastewater by the experimental system planted with umbrella grass（PCW-MFC）, the average removal efficiencies of NH₄⁺-N, TP and sulfadiazine（SDZ）were increased by approximately 5%, 10%, and 3% respectively, and the output voltage, coulombic efficiency, and maximum power density were recorded as 415.93mV, 49.10%, and 51.12mW/m³, respectively. The relative abundances of Proteobacteria, Bacteroidetes and Firmicutes were increased by umbrella grass, which played a key role in pollutant removal and bioelectricity generation.

Coke powder（CP）, a coking byproduct, was employed as an adsorbent to investigate the adsorption performance and mechanisms toward polycyclic aromatic hydrocarbons（PAHs）substituted with different functional groups—naphthalene, naphthol, and naphthoic acid. The potential of CP for removing PAHs from wastewater was further evaluated through systematic analyses. Adsorption performance tests demonstrated removal efficiencies of 97.4%, 86.6%, and 76.8% for naphthalene, naphthol, and naphthoic acid, respectively, within 120 min, with pseudo-second-order kinetic rate constants of 0.680, 0.532, and 0.183g/（mg⋅min）. The maximum adsorption capacities followed the order: naphthalene（23.8mg/g）>naphthol（8.04mg/g）>naphthoic acid（3.94 mg/g）. While pH exhibited minimal effects on the adsorption of naphthalene and naphthol, naphthoic acid adsorption was significantly enhanced under acidic conditions compared to neutral or alkaline environments. Results of FTIR, XPS, DRUV-Vis spectroscopy, and DFT calculation revealed that the adsorption of naphthalene on CP was multilayered, primarily driven by hydrophobic interactions, van der Waals forces, and π-π electron donor-acceptor（EDA）interactions. In contrast, the adsorption of naphthol and naphthoic acid involved monolayer chemisorption, attributed to strong π donors and the π-π EDA interactions with the polarized electron-depleted regions on the CP surface. The hydrophilic nature of the hydroxyl group in naphthol reduced the saturation adsorption capacity. While electrostatic repulsion between naphthoic acid and CP weakened the π-π EDA interaction, resulting in a slightly lower adsorption capacity.

A laboratory-scale AnMBR was established to investigate the methanogenic performance, organic matter removal efficiency, membrane fouling behavior, as well as the material flow and energy conservation and emission reduction under the optimal operating conditions during the treatment of methylamine wastewater. The results showed that as hydraulic retention time（HRT）decreased from 36h to 8h, average methane yield rose from 0.231L CH₄/g COD to 0.287L CH₄/g COD. COD removal was stable above 95%, methylamine removal hit 100%. But at 6h HRT, methylamine removal was only 44.3%, reactor performance dropped, and methane yield fell to 0.094L CH₄/g COD. Membrane flux rose from 1LMH to 6LMH, transmembrane pressure（TMP）growth was slow. At 12h HRT, long operation made TMP exceed 20kPa. After replacing the membrane module, analysis show irreversible fouling inside, relate to microbial extracellular polymers. Considering comprehensively the methanogenic performance and the growth rate of TMP in each stage, the optimal operating condition is determined as HRT=8h. More than 80% of the influent COD is converted into methane, the generated bioenergy is significantly higher than the power consumption of the system operation, the net energy potential reaches 4.142kW·h/m³, and it can reduce carbon emissions by 2.239kg CO₂/m³.

Employed a SBR to simulate municipal wastewater as the influent matrix and initiated the Nitritation-Enhanced Partial Denitrification-Complete Autotrophic Nitrogen Removal Over Nitrite（N-EPD-CANON）process. The anoxic duration within the EPD system was meticulously adjusted to scrutinize the impact on endogenous nitrite accumulation and the consequent performance alterations within the CANON system. The objective was to elucidate the influence of anoxic time on endogenous nitrite concentration and its subsequent effects on nitrogen removal efficiency, the activity of functional microbial groups, and the structure of microbial communities within the CANON process. The findings revealed that an anoxic duration of 40minutes within the EPD system was optimal for capturing influent organic matter while concurrently promoting the endogenous nitrite to accumulate at a favorable concentration of approximately 4mg/L. Under sustained operational conditions, the CANON reactor achieved a total nitrogen removal rate of 86.43%. The specific anammox activity（SAA）was determined to be 0.82gN/（gVSS·d）, the particular nitrate production rate（SNPR）was reduced to 0.28gN/（gVSS·d）, and the specific ammonium removal rate（SAOR）was recorded at 0.70gN/（g VSS·d）. Additionally, the application of 3D-EEM and PARAFAC techniques to analyze the fluorescence components of EPS in the sludge indicated that the intensification of endogenous nitrite had a beneficial effect on increasing the content of aromatic proteins within the EPS without altering its composition. Microbiota community analysis reveals that Candidatus_Competibacter is the dominant genus in the EPD system, accounting for 24.61%. In contrast, in the CANON system, the relative abundance of Nitrosomonas at 2.67% ensures the NO₂^--N supply for AnAOB, and Candidatus Brocadia, as the main genus of AnAOB, accounts for 13.34%.

The effects of three different influent strategies on the protein content of extracellular polymeric substances（EPS）were investigated to assess their impact on sludge retention capacity of the CANON process. R1was operated under conventional influent strategy as the control group, while R2 and R3 were subjected to different variable influent strategies. After 90 days of operation, the SVI values in R1, R2, and R3 were 62.93, 53.10, and 57.59mL/g respectively indicating that the variable influent strategies could improve sludge settleability. The PN/PS ratios were significantly higher in R2（8.21）and R3（7.61）compared to R1（5.56）. Three-dimensional fluorescence analysis revealed that the proportion of aromatic proteins in TB-EPS was highest in R2（32.47%）, much higher than in R1（11.58%）and R3（10.5%）. This indicated that the variable influent strategy promoted the formation of aromatic proteins in TB-EPS, enhancing the hydrophobicity of the sludge and improving settleability. The specific anaerobic ammonium oxidation activity（SAA）increased to 4.03, 4.68 and 4.36mg N/（g VSS· h）in R1, R2, and R3, respectively. Notably, the SAA in R2 and R3 exceeded that of the seed sludge, indicating the successful formation of mature CANON granular sludge. Although microbial activity in R2 and R3 was initially inhibited by loading fluctuations during early operation, the microbial communities gradually adapted to environmental fluctuations and regained stable metabolic activity, successfully operating the CANON process on day 54 and day 51, respectively. Total nitrogen removal efficiencies reached approximately 72.54%, 70.14%, and 73.75% in R1, R2 and R3 by day 90, demonstrating effective nitrogen removal performance.

A self-drive weak electric strengthening constructed wetland（SECW）, which was renovated from a hybrid subsurface constructed wetland（HCW）based on ANAMMOX, was established in this study, and its operational performance was thoroughly investigated. Further, the microbial characteristics in the system during the steady operational period were explored, and the nitrogen transformation pathways were also analyzed and elucidated. The results showed that, prefabrication of electroactive biofilms and appropriate layout of the electrodes not only simultaneously enhanced electrode-dependent ammonium oxidation and cathodic denitrification in the SECW, but also significantly increased the abundance and activity of anaerobic ammonium-oxidizing bacteria in its substrate layer. Consequently, a multi-path nitrogen removal system based on ANAMMOX was formed in the device, thereby significantly improving the nitrogen removal performance of the SECW. When the electrode configuration was adopted as “double cathode-single anode” and the hydraulic loading rate（HLR）was 0.08m³/（m²·d）, the SECW exhibited optimal performance. Specifically, its COD, TP, TN, and NH₄⁺-N removal rates could reach up to（91.39±3.09）%,（93.64±1.15）%,（91.67±2.77）%, and（94.34±2.72）%, respectively. Additionally, the mean output voltage and power density of the system respectively maintained at（816.45±8.44）mV and 651.96W/m³.

The scouring of sediment deposits in sewer system constitutes a critical factor in overflow pollution. By integrating rainfall intensity variations, stratified anti-scouring characteristics, and dynamic pollutant transport, a dynamic transport model was developed to evaluate stratified sediment scouring under different rainfall intensities and its impact on water quality transformation. Experimental results demonstrate significant disparities in sediment scouring efficacy across varying rainfall intensities. Under light rainfall conditions, the scouring rate measured 6.04m³/h, primarily removing superficial sediment layers. Moderate and heavy rainfall events induced substantial enhancement of flow shear forces, with pipe discharge reaching 71.08m³/h during intense precipitation, capable of mobilising larger particles from underlying sediment strata. A pronounced "initial phase effect" was observed across all rainfall intensities, characterised by rapid pollutant concentration peaking during precipitation onset. Under heavy rainfall, sulphate concentrations surged to 17.89mg/L within 1min before stabilising at 8.95mg/L, while Total Chemical Oxygen Demand（TCOD）exhibited a swift ascent to 2106.3mg/L followed by stabilisation at 1056.6mg/L. In contrast, light rainfall conditions yielded markedly lower peak values of 10.29mg/L for SO₄^2- and 1100.60mg/L for TCOD, though similarly demonstrating rapid initial concentration escalation followed by gradual stabilisation.

This research conducted an experiment on DNAPL contamination in a saturated porous medium within a three-dimensional sandbox and performed synchronized dynamic monitoring using electrical resistivity tomography（ERT）. The resistivity images obtained from ERT were used to determine the spatial distribution of DNAPL contaminants, which were then compared with the numerical simulation model established in the sandbox experiment. The absolute value of the relative error in the diameter of the DNAPL distribution area obtained from the numerical simulation and the DNAPL distribution area determined by the ERT monitoring ranged from 2.00% to 27.50% across different spatial locations. The absolute value of the relative error in the diameter of the DNAPL distribution area obtained from the numerical simulation and the DNAPL distribution area determined by the ERT monitoring ranged from 2.7% to 40.58% at different time points. The results demonstrate the feasibility of using the numerical simulation software Petrasim to predict the distribution range of DNAPL contamination in saturated sandy soil.

A total of 78 water samples from mesotrophic and eutrophic urban lakes in Nanjing, Jiangsu Province, China were systematically analysed using three-dimensional excitation-emission matrix（EEM）fluorescence spectroscopy coupled with parallel factor analysis（PARAFAC）to characterize dissolved organic matter（DOM）composition and sources as well as their links with water physiochemistry parameters. This study was designed to unravel the effects of eutrophication on the fluorescence characteristics of DOM and its influence pathway. Three distinct fluorescent components were identified: anthropogenic-derived humic-like substances（C1）, terrestrial humic-like substances（C2）, and microbial-produced protein-like substances（C3）. Eutrophic urban lakes exhibited significantly higher fluorescence intensities in both C2 and C3 relative to mesotrophic urban lakes. Fluorescence indices confirmed dual DOM sources-terrestrial inputs and autochthonous production. Meanwhile, although the humification index of DOM in mesotrophic urban lakes exceeded that in eutrophic urban lakes, the humification index of DOM was below 1.0 for all samples. Moreover, the biological index of DOM exhibited an increasing trend with the elevation of trophic status of water column. Additionally, significantly elevated Chla concentration were observed in eutrophic lakes compared to mesotrophic lakes. Strong positive correlations were identified between Chla concentration and the fluorescence intensity of C2 and C3 components alongside the biological index of DOM, suggesting that eutrophication may induced autochthonous DOM by stimulating algae reproduction.

The determination of environmental background values for groundwater was recognized as a prerequisite and key step for the scientific identification, evaluation, and prevention of groundwater pollution. In this paper, the development history of groundwater environmental background value research was reviewed both domestically and internationally. Existing calculation methods for groundwater environmental background values were discussed along with their respective advantages and disadvantages. The research paradigm for background value reasonableness validation analysis and cause analysis was systematically summarized. Finally, existing problems in current groundwater environmental background value research were identified, and future development trends were projected. It was observed that inconsistencies in naming and definitions of groundwater environmental background values persisted among scholars worldwide. Although the influence of human activities on groundwater chemical components had been considered, quantitative determination of the "low human activity impact" threshold in conceptual frameworks remained challenging. Methods for determining environmental background values were generally categorized into mathematical-statistical approaches, model-based methodologies, and other alternative techniques. Each method was found to possess distinct advantages and limitations. The combination of hydrochemical analysis with mathematical statistics was demonstrated to emerge as one of the representative integrated approaches for calculating groundwater environmental background values, though methodologies for trace and micro-component analysis were noted to require further development. The reasonableness of environmental background values was typically assessed through comprehensive evaluation of multiple factors including surrounding pollution sources, hydrogeological conditions, lithological characteristics, land use patterns, pollution percentage indices, and stable isotope results. Regional geological settings and hydrogeological conditions were identified as primary controllers of groundwater environmental background values, while biogeochemical processes were determined to dominate micro-enrichment mechanisms. Based on established environmental background values, groundwater pollution levels were effectively evaluated, pollution risk areas were scientifically delineated, and reference thresholds were provided for environmental regulation and remediation targets. Future priorities were emphasized to include the urgent establishment of a global groundwater environmental background value database, enhanced application of existing background value data, and strategic utilization of big data analytics. These measures were proposed to optimize global groundwater resource protection and pollution control strategies under combined pressures of climate change and anthropogenic impacts.

The discovery of complete ammonia-oxidizing bacteria（comammox）provided a novel direction for improving nitrification efficiency in wastewater treatment systems. The potential of their metabolic pathways and functional genes for efficient nitrogen an d carbon removal from wastewater was demonstrated. However, strategies to achieve robust comammox enrichment remained controversial. Further investigations were required to characterize the specific contributions to ammonia removal and nitrous oxide（N₂O）production during the nitrification process. The technical strategies for efficient comammox enrichment and the impacts of key factors including environmental substrate concentration, dissolved oxygen, operational processes, and temperature on the selective enrichment of comammox were summarized. Chlorate was employed as a specific inhibitor targeting comammox in combination with 1-octyne to construct a dual-inhibitor experimental system, which was capable of clarifying the nitrification contribution and N₂O emission potential of comammox in wastewater treatment systems.

This study focuses on a decommissioned mining area of acid in-situ leaching in Xinjiang. By analyzing long-term groundwater monitoring data, a three-dimensional transient groundwater flow and contaminant solute transport model was developed to simulate the migration of contaminant species（U（Ⅵ）and ）in the ore-bearing aquifer. The study aims to provide a reasonable hydraulic control strategy to ensure the groundwater environmental safety in the decommissioned mining area. The results indicate that the post-decommissioning groundwater flow field is generally consistent with the direction of the natural flow field. High concentrations of U（Ⅵ）and remains extensively in the mining area and gradually migrate and diffuse downstream under the influence of groundwater dynamics. The constructed model successfully reproduces the observed groundwater level trends in the decommissioned mining area and accurately simulates the downstream migration and diffusion of U（Ⅵ）and from within the mining area. This demonstrates that hydraulic control is a crucial measure for ensuring the ecological safety of the downstream groundwater environment in future conditions. Analysis of three hydraulic control pumping schemes revealed that a combined internal and external pumping strategy yielded the best control results. Using a comprehensive evaluation method to quantitatively assess each scenario, the optimal solution was determined to involve installing six pumping wells downstream and three pumping wells within the mining area, each operating at a pumping rate of 60m³/day. This approach achieves effective source reduction within the site and hydraulic containment downstream, keeping contaminant migration within a 50m range at relatively low cost. By employing the developed numerical model to compare and select hydraulic control strategies under future planning conditions, this study provides a scientific basis for decision-making on groundwater environmental safety in the mining area and offers valuable insights for the remediation of similar decommissioned in-situ leaching uranium mines.

To clarify the dissolution patterns of pathogenic microorganisms in rainwater runoff, a laboratory-simulated rainfall experiment was conducted to flush soil treated with earthworm castings. Propidium monoazide（PMA）combined with quantitative PCR（qPCR）was used to investigate changes in the abundance of viable fecal indicator bacteria（FIB）. The results exhibited that after rainfall, the concentrations of electrical conductivity, ammonia, nitrate, and total phosphorus（TP）in the mixed soil matrix decreased by 51.34%, 45.20%, 99.09%, and 26.22%, respectively. In runoff water, the concentrations of ammonia, total phosphorus, and chemical oxygen demand（COD）exhibited a trend of initially rising and then falling, with peak values occurring within the first 15minutes. The qPCR quantification results for four fecal indicator bacteria—total coliforms（TC）, fecal coliforms（FC）, Escherichia coli（EC）, and Enterococcus spp（ES）—also displayed a similar trend of increasing and then decreasing. A significant positive correlation was found between the PMA-qPCR results and the culture method（Spearman r=0.723, P<0.001）. The fecal coliform counts in all runoff samples exceeded the limits specified in the "Surface Water Quality Standard"（40000CFU/L）. The study indicates that viable pathogenic microorganisms can be washed into water bodies through rainfall and are widely dispersed during initial runoff, increasing the risk of their environmental transmission.

To enhance the acid production efficiency of sludge anaerobic fermentation, based on the established evidence that the inclusion of syngas improved waste activated sludge（WAS）fermentation performance, this study investigated the effects of different chemical pretreatments combined with a syngas-mediated WAS fermentation system. The results showed that the free nitrous acid combined with peracetic acid（FNA/PAA）experimental group had the highest production of short-chain fatty acids（SCFAs）（（5520.20±204.99）mg COD/L）. However, the FNA/PAA group exhibited only 50.4% and 35.8% utilization rates for H₂ and CO, respectively. In contrast, the TAP group demonstrated efficient utilization of syngas, with H₂ and CO utilization rates reaching 99.8%and 95.8%, respectively. Moreover, the production of SCFAs in the TAP group achieved a significant level of（4663.67±163.86）mg COD/L. At the same time, the three-dimensional fluorescence spectrum showed that TAP group had better extracellular polymer stripping and WAS lysis efficiency. TAP group also enhanced the enrichment of acid-producing functional bacteria in the anaerobic fermentation process, and significantly increased the abundance of Firmicutes to 59.0%. In addition, Romboutsia, which can metabolize acetic acid, ethanol and H₂, accounted for the highest proportion in alkali pretreatment（AP）and TAP groups（19.2% and 21.3%）.

Using Taihu algal mud as the research subject, two common flocculants, polymeric ferric sulfate（PFS）and polyacrylamide（PAM）, were selected to prepare different hydrochars at 180°C, 220°C, and 260°C. The results demonstrated that as the hydrothermal temperature increased, the carbon content in the algal mud hydrochar increased, while the hydrogen and nitrogen contents decreased. Decarboxylation and hydrolysis reactions were identified as the dominant processes during the hydrothermal conversion. The incorporation of PFS significantly enhanced the iron content in the hydrochar by 519.6% to 748.3%, and the rise in hydrothermal temperature facilitated the transformation of iron from Fe（III）to Fe（II）, thereby improving its reducibility. PAM exhibited degradation at lower temperatures, generating oxygen-containing functional groups, while PFS promoted the degradation and carbonization of organic matter. The hydrochar prepared at 180°C showed higher nutrient retention. Rice cultivation experiments indicated that the application of algal mud-based hydrochar did not adversely affect rice growth；notably, PAM-based hydrochars increased rice plant biomass by 9.0%. Based on field survey data, it was estimated that converting Taihu algal mud into hydrochar could annually recover 3077.7 tons of total nitrogen and 776.7 tons of total phosphorus. The recovered total phosphorus accounted for 43.1% of the external phosphorus load input into Taihu Lake.

In this study, a pot experiment was conducted to simulate soil contaminated with varying levels of cadmium（Cd）, arsenic（As）, and lead（Pb）to investigate the changes in biomass, the absorption and accumulation of mineral nutrients, as well as the accumulation characteristics of heavy metals under different contamination conditions. Furthermore, soil threshold for Cd, As, and Pb in acidic soil were derived to ensure the safe production of cherry radish. The results indicated that cherry radish exhibited significant toxic effects when heavy metals content added in soil reached the risk control threshold. The contents of iron（Fe）, copper（Cu）, and zinc（Zn）in root of cherry radish increased initially and then decreased as the level of heavy metals contamination increased, while manganese（Mn）content continuously increased. The root of cherry radish had the highest enrichment and translocation ability for Cd, with average bioconcentration factors（BCF）being 18.6 and 115 times higher than those for As and Pb, respectively. The average translocation factors（TF）for Cd were 4.02 and 2.41 times higher than those for Pb and As, respectively. Based on the National Food Safety Standard（GB2762—2022）, and considering the safety of both the roots and shoots of cherry radishes, the derived soil threshold values for safe cherry radish production in acidic soil were 0.30mg/kg for Cd, 171.1mg/kg for As, and 27.5mg/kg for Pb.

In this study, fly ash, blast furnace slag, desulfurization gypsum, sludge, straw, and sawdust were utilized as raw materials. These materials were mixed at varying ratios, and Solanum nigrum was selected as the experimental plant for indoor pot trials. Farmland soil and contaminated soil from a metal mining wasteland were employed as controls. Variance analysis and Mantel tests were employed to analyze the effects of substrate ratios on Solanum nigrum growth characteristics, physicochemical properties of reconstructed soil, and relationships between substrate materials. A minimum dataset（MDS）for soil quality evaluation and entropy-weighted TOPSIS were applied to identify optimal substrate ratios. The results demonstrated that reconstructed soils formed by different solid waste ratios exhibited loose textures and enhanced water retention. Organic matter content was measured within a range of 39.01~70.03g/kg. All solid waste-based reconstructed soils were found to support Solanum nigrum growth, with biomass ranging from 0.11 to 3.18g/pot. A minimum dataset for soil quality assessment was established based on four critical indicators: chlorophyll content, plant height, pH, and water stability of 0.5~1mm aggregates. Subsequently, the entropy-weighted TOPSIS model was applied to systematically evaluate the comprehensive quality of the reconstructed soils. The optimal combination ratio, identified as fly ash: blast furnace slag : desulfurization gypsum : sludge : straw at a mass ratio of 4:2:1:1:2, demonstrated superior performance in both plant growth and soil functionality.

The remediation effect of Robinia pseudoacacia L. intercropped with Solanum nigrum L. and Pteris vittate L. on Cd and As contaminated soil was studied through a pot experiment. The results showed that the intercropping of R. pseudoacacia L. could promote the growth and the uptake of Cd and As in S. nigrum L. and P. vittate L., and reduce the content of Cd and As in soil, as well as enhance soil enzyme activities. Compared with the monocultures of S. nigrum L. and P. vittate L., the whole biomass of S. nigrum L. and P. vittate L. was significantly enhanced（P<0.05）by 50.4% and 86.2% when intercropped with R. pseudoacacia L. Meanwhile, the contents of Cd and As in the leaves of S. nigrum L. were significantly enhanced（P<0.05）by 78.4% and 260.7%, respectively. The total accumulation of As in aboveground parts of all plants under the intercropping of R. pseudoacacia L. with S. nigrum L. and P. vittate L. was significantly enhanced（P<0.05）by 1.11 and 2.17 times compared with the monocultures of R. pseudoacacia L. or S. nigrum L., and the total accumulation of Cd was significantly enhanced（P<0.05）by 1.89 and 15.72 times compared with the monocultures of R. pseudoacacia L. or P. vittate L. Moreover, the contents of available Cd and As in soil under the intercropping of R. pseudoacacia L. with two hyperaccumulators were significantly reduced（P<0.05）by 23.6% and 17.0% compared with the control, respectively. Meanwhile, the contents of soil organic matter and alkaline hydrolysis nitrogen were significantly enhanced（P<0.05）by 46.2%~83.2% and 18.5%~26.4% as compared with the monocultures, the activities of soil catalase was significantly enhanced（P<0.05）by 43.7%~53.0% compared with the monocultures of R. pseudoacacia L. or P. vittate L., the soil sucrase and urease activities were also significantly enhanced（P<0.05）by 11.5%~28.4% and 20.6%~36.4% compared with the monocultures of R. pseudoacacia L. and S. nigrum L., respectively. The results suggested that the intercropping of R. pseudoacacia L. with two different types of hyperaccumulator could effectively uptake and accumulate Cd and As to reduce the bioavailability of Cd and As in the contaminated soil, and effectively improve the soil environmental quality, which could be considered as a promising intercropping model for the simultaneous remediation of Cd and As contaminated soil in mining areas.

This study investigated the functional characteristics of plant growth-promoting rhizobacteria（PGPR）isolated from the rhizosphere soil of Celosia argentea Linn., a Cd-hyperaccumulator. A strain with high tolerance to Cd^2-, Pb^2-, and Zn^2- was isolated. This strain was identified using physiological and biochemical characteristics analysis and sequence analysis of the 16S rDNA and nrdA functional genes. The effects of various culture conditions on the strain's growth and heavy metal removal capabilities, as well as its potential for promoting plant growth were examined. This strain was identified as Achromobacter sp., designated WL-37. The minimum inhibitory concentrations（MIC）of Cd^2-, Pb^2-, and Zn^2- for strain WL-37 were determined to be 600, 1800, and 1000mg/L, respectively. Under optimized conditions（e.g., pH values and inoculation amounts）, the strain achieved maximum removal rates of 69% for Cd²⁺, 95% for Pb²⁺, and 62% for Zn²⁺. Moreover, WL-37 exhibited multiple plant-promoting traits, including nitrogen fixation, ACC deaminase production, and siderophore production. In summary, the high-efficiency strain identified in this study represents a valuable resource for the remediation of multi-metal contaminated soils and supports the development of plant-microbe combined remediation technologies.

High-concentration areas of soil heavy metals exist in ecological functional protection zones of Southwest China. To investigate their potential pollution risks and influencing factors, this study selected soils in the Xuanwei region of Yunnan Province as the research subject. Combining geographical, geological, and anthropogenic activity data, the content characteristics of eight heavy metal elements were analyzed in 1487 surface soil samples and 374 deep soil samples. The geo-accumulation index and potential ecological risk index were used to assess the potential pollution risks of surface soils, while principal component analysis（PCA）and geographical detector methods were employed to identify influencing factors. The results revealed that heavy metals in both surface and deep soils were enriched compared to the A-layer and C-layer background values of Chinese soils. Most heavy metals also exhibited enrichment relative to the A-layer and C-layer background values of Yunnan Province. Cd, Hg, and Pb posed relatively high potential pollution risks, whereas Cu, Cr, Ni, Zn, and As showed lower risks. The main influencing factors for heavy metal enrichment included geological background, clay minerals, organic matter, mining activities, and topography. Synergistic effects of multiple factors could exacerbate heavy metal enrichment, while pH, CaO, Light（light index）, and WIG exhibited minimal impacts.

This study focused on the long-term AMD-contaminated paddy soils in the Dabaoshan mining area of Guangdong Province. The distribution characteristics of soil iron phases and iron-bound organic carbon were analysed, combining with high-throughput sequencing to examine the effects of AMD irrigation on soil organic carbon sequestration and the response of soil microbial community structure. The results indicated that: ① AMD irrigation led to soil acidification, with accumulation of iron, sulfur and heavy metals in paddy soils. The contents of TOC in paddy soils showed significant positive correlation with TFe, and OC_Fe. ② AMD irrigation resulted in decreases of soil microbial abundance and diversity. AMD irrigation led to a decrease in the relative abundance of Geobacter in paddy soils, whereas acid tolerant iron and/or sulfur metabolizing bacteria such as Thiobacillus and Thioifustis became the dominant bacteria in paddy soils with the most heavily AMD pollution. ③ RDA analysis identified Fe_p, TOC, and TFe were the most crucial factors influencing microbial community structure. In conclusion, AMD irrigation brought dissolved iron into paddy soils which was beneficial to soil organic carbon preservation. In addition, AMD irrigation resulted in the formation of microbial community structure that closely related to AMD pollution gradient, the form and content of iron and carbon.

This study was conducted in an agricultural irrigation area of reclaimed water in Suqian City. In the irrigation area, regions with long-term surface water irrigation（S1）, short-term reclaimed water irrigation（S2）, and long-term reclaimed water irrigation（S3）were selected. Undisturbed soil samples were collected from depths of 0~20cm and 20~40cm using plastic and metal rings. CT scanning and image processing technology were used to obtain the connected pores and their structural characteristics under different treatments, while the hydraulic properties of the soils were simultaneously tested. This study aimed to investigate the impact of reclaimed water irrigation on soil pore structure and hydraulic parameters and to analyze the key pore parameters that caused changes in hydraulic properties. The results showed short-term reclaimed water irrigation disrupted the soil pore structure, lending to a simplification of the pore architecture. After long-term reclaimed water irrigation, the soil pore structure improved compared to short-term irrigation, with no significantly difference observed when compared to the soil under long-term surface water irrigation. The use of reclaimed water for irrigation had no significant impact on the pore structure and hydraulic properties of both surface and subsurface soils. Reclaimed water irrigation significantly reduced soil hydraulic conductivity. Compared to the soil under long-term surface water irrigation, the hydraulic conductivity（K_S）for short-term and long-term reclaimed water irrigated soils decreased by 20.81% and 20.18%, respectively. Reclaimed water irrigation had little effect on soil water retention capacity. The changes in pore structure after reclaimed water irrigation significantly affected the soil's hydraulic properties. Redundancy analysis showed that pore parameters explained 83.30% of the variation in hydraulic properties, with surface fractal dimension having the greatest impact on hydraulic properties. Pore shape had no significant relationship with any hydraulic parameters.

Based on the monitoring data of 47 typical fine chemical in-process sites in Shanghai, the pollution of soil and groundwater in this industry was analyzed, the health risk of pollutants was evaluated, and high-priority pollutants were screened. The findings revealed that the industries with the highest pollution risk were those involved in basic chemical raw material manufacturing, pesticide manufacturing, paint and similar product manufacturing, and specialty chemical product manufacturing, collectively representing 70% of the contaminated sites. In comparison, the chemical raw material manufacturing industry exhibited a pollution risk of 54.55%, while the daily chemical products manufacturing industry showed the lowest pollution risk（0%）. The most frequently detected contaminants in the soil and groundwater included arsenic, lead, mercury, nickel, zinc and total petroleum hydrocarbons（TPH）, which were present at relatively low concentrations. In contrast, benzene derivatives（BTEXs）, polycyclic aromatic hydrocarbons（PAHs）, and most chlorinated hydrocarbons（CAHs）were detected in small areas of certain sites, indicating more severe contamination levels. Furthermore, cyanides, antimony, manganese, and tetrachloroethylene were found in larger areas of certain sites, representing the highest contamination levels. The pollution profile of the basic chemical raw material manufacturing industry was the most complex, involving cyanide, antimony, arsenic, manganese, mercury, CAHs, PAHs, and TPH. On the other hand, pesticide manufacturing, paint and similar product manufacturing, and specialty chemical product manufacturing industries were primarily contaminated by CAHs and BTEXs. A notable observation was the evident soil-water compound pollution phenomenon involving chlorinated hydrocarbons and benzenes. Through comprehensive environmental exposure and human health risk assessments, the following were identified as high-priority soil pollutants: arsenic, chloroform, 1,2-dichloroethane, benzo[a]pyrene, antimony, vanadium, trichloroethylene, lead, carbon tetrachloride, and naphthalene. For groundwater, the high-priority pollutants included trichloroethane, tetrachloroethylene, cyanide,1,2-dichloroethane, benzene, methylene chloride, nickel, antimony, manganese and trichloroethylene.

The impacts of dry-rewetting and freeze-thaw cycles on DTPA-extractable Pb（II）content and Pb speciation in soils and material structure of weathered coal-based immobilized microbial materials were investigated through a controlled simulated experiment. This study aimed to explore the mechanisms through which these two factors affect the effectiveness of lead-contaminated soil remediation using selected microbes. The results showed that after 35 dry-rewetting cycles, the DTPA-extractable Pb（II）content in low-concentration lead-contaminated soil（LS）and high-concentration lead-contaminated soil（HS）decreased by 46.41% and 29.42%, respectively, compared to the initial levels. After 35 freeze-thaw cycles, the content in LS and HS decreased by 40.06% and 32.77%, respectively. Additionally, the residual fraction of Pb in LS increased under both dry-rewetting and freeze-thaw treatments. Structural analysis revealed that the surface of weathered coal-became rougher, with increases in specific surface area, oxygen-containing functional groups, and Pb adsorption sites increased after dry-wet and freeze-thaw cycles. These changes enhanced complexation with functional groups thereby improving the stability of the passivation effect on lead contamination.

To comprehensively evaluate the reduction potential of diffuse nitrogen pollution under the field-ditch-pond system optimization, a watershed hydrological model was used to simulate the multi-scenario optimization of field ponding water level, ditch, and pond in a typical paddy field watershed. Results showed that different optimizations had different interception effects on diffuse nitrogen pollution, and that interception effects were different over distinct hydrological years. Under the optimization of field ponding water level, the total nitrogen loss from paddy fields after optimizing the drainage water level was reduced by 7.9% to 93.9% compared to conventional water level management, with the nitrogen interception effect being better in dry years than in wet years. Under ditch optimization, the reduction rate of nitrogen loss in the watershed increased from 0.8% to 26.7% after increasing the grass planting density of ditches, with the nitrogen interception effect being better in wet years than in dry years. Under pond optimization, the reduction rate of nitrogen loss in the watershed increased from 10.5% to 18.1% after increasing the catchment area of the pond, with the nitrogen interception effect being better in dry years than in wet years. Under the multi-optimization of the field-ditch-pond system, the interception effect of field ponding water level optimization on watershed nitrogen loss was better than that of pond optimization and ditch optimization. In summary, the multi-optimization of the field-ditch-pond system can effectively control the diffuse nitrogen pollution in paddy field watersheds and could promote the sustainable development of rice production.

To predict the long-term response of soil and surface water chemistry after the reduction in acid deposition, a dynamic MAGIC model combined with long-term monitoring data was conducted on a subtropical forest in Tieshanping, Chongqing, Southwest China. Under the “actual emission reduction” scenario based on China's “14th Five-Year Plan”（where the sulfur dioxide（SO₂）emissions remained at the 2020 level, and the nitrogen oxides（NO_x）and ammonia（NH₃）emissions were reduced by over 10%and 8%, respectively, by 2025）, the simulation results indicated that sulfate（SO₄²⁻）concentrations in soil water（S1and S2）and surface water（SW）initially increased, and stabilized after 2028 until 2050. The average SO₄²⁻ concentrations in S1, S2 and SW water from 2021 to 2050 were 1426, 1414, and 938µeq/L, respectively, which were still above the 1980levels. The decline of SO₄²⁻ concentrations in surface water was delayed by approximately 23 years. Soil water nitrate（NO₃⁻）concentrations showed a declining trend by 2050, but it remained above the threshold（443µeq/L）, whereas surface water NO₃⁻ concentrations had decreased below its threshold（411µeq/L）. The decline of NO₃⁻ concentrations in surface water was lagged approximately 13 years, compared to it in throughfall. Additionally, the concentrations of base cation（calcium, Ca²⁺）in both soil and surface water increased. The pH and Acid Neutralizing Capacity（ANC）in soil and surface water remained below their acidification thresholds. The acidification recovery showed a lag effect. The strong acidic anions in soil and surface water will decrease below their thresholds, pH will increase, and ANC will increase above 0µeq/L, when the stricter emission control policies were implemented, for example the SO₂ emissions decrease to 80% of 2021l evels by 2030 and 70% of 2021 levels by 2050, and the NH₃ emissions, NO_x emissions, and Ca²⁺ deposition decrease to 60% of 2021 levels by 2030 and 40% of 2021 levels by 2050. Moreover, further global temperature increases showed insignificant impact on the major strong acidic anions and acidification indicators in the highly acidic soils and surface waters of the subtropical forest.

The combination of ground remote sensing and UAV remote sensing was used to estimate the nitrogen content of typical grassland vegetation in Inner Mongolia. This experiment was carried out in the grassland ecology research base of Inner Mongolia University from August to September 2023, and the ground ASD spectral data and UAV Resonon data were collected. Based on ASD data, four spectral parameters of vegetation index, hyperspectral characteristic variable, continuum removal variable and wavelet coefficient were constructed, and LASSO was used to screen sensitive parameters. Five models of multiple linear, XGBoost, SVM, ANN and KNN were constructed to estimate the nitrogen content of vegetation. The results showed that the SVM method based on wavelet coefficients was the optimal model（validation set R²=0.72, RMSE and MAE were 0.26 and 0.18, respectively）. Finally, the model was used to estimate and map the UAV Resonon data（validation set R²=0.41, RMSE and MAE were 0.42 and 0.32, respectively）. The research showed that the combination of ASD and UAV images with machine learning algorithms could be used to realize the estimation of grassland vegetation nitrogen content, and was provided basic data and technical support for optimizing fertilization and improving forage quality.

To investigate the influence of microbial communities on arsenic speciation in lake sediments of the Hetao Basin in Inner Mongolia during the ice-bound period, the sediments from Wuliangsuhai（WLSH）were taken as the research object. Using 16SrRNA high-throughput sequencing technology, the structural characteristics of microbial communities in WLSH sediments during the ice-bound period were studied. Additionally, methods such as redundancy analysis（RDA）, correlation analysis, and co-occurrence network analysis were employed to explore the response relationship between sediment microbial communities and arsenic speciation during the ice-bound period. The results indicated that, apart from the residual arsenic, strongly adsorbed arsenic and arsenic co-precipitated with AVS（Acid-extractable sulfides in sediment）, carbonates, manganese oxides, and poorly crystalline Fe hydroxides accounted for a relatively high proportion in the sediments of WLSH during the ice-bound period. When the sedimentary environment was unstable during the ice-bound period, there was a risk of secondary release of arsenic in the sediments of WLSH. The microbial community in the WLSH sediments during the ice-bound period exhibited abundant diversity, and the richness and diversity of microbial community species showed obvious spatial distribution characteristics. There was a significant collinear relationship between microbial communities and arsenic speciation during the ice-bound period, with Thiobacillus, Bacillus, Steroidobacter, Desulfosarcinaceae, and Anaerolinea exhibiting the most pronounced effects on arsenic speciation. Furthermore, adsorbed As, As co-precipitated with AVS, carbonates, manganese oxides, and poorly crystalline Fe hydroxides, as well as As in pyrite, could mutually transform during the ice-bound period, and Thiobacillus and Steroidobacter played crucial roles in this transformation process. This study aims to explore the impact of microbial communities on arsenic speciation in sediments of WLSH during the ice-bound period, providing a microbial theoretical basis and scientific evidence for lake arsenic pollution control. It provides significant implications for the rational development and utilization of water resources, as well as the protection and restoration of aquatic ecological environments.

Based on core sampling, sequential extraction procedure in the laboratory, correlation analysis between sediments and groundwater, and mineral saturation index（SI）of groundwater, this paper explored the distribution, form and influencing factors of RIS in Quaternary sediments in the middle and lower reaches of Chaobai alluvial-proluvial fan, in Beijing. Results showed that the content of RIS in the study area followed a descending order of: Pyrite-S（CRS）>essential sulfur（ES）>acid volatile sulfide（AVS）, among which CRS accounting for 80.1%, ES and AVS accounting for 13.4% and 5.56% respectively. 67% of samples had CRS/AVS value higher than 3. The RIS content in sediments in the upper reaches was lower than that in the lower reaches, and RIS contents in the four aquifers from shallow to deep were 84.3, 37.4, 39.1 and 10.5mg/kg respectively, showing an overall decreasing trend. The results of RDA and correlation analysis indicated that the TOC content, CRS/AVS value and water content in sediments were crucial factors affecting the content and form of RIS in the study area. Specifically, the content of RIS was also affected by the groundwater pH value, iron/sulfur ratio and hydrogeological conditions, and the form of RIS was affected by the COD_Mn and ORP of groundwater. The SI value of FeS in groundwater fluctuated around 0, and the SI value of FeS₂>0. In summary, RIS in the sediments of the study area is basically unaffected by human disturbance, and the activity and bioavailability of sulfide are low. The sediments may affect the concentrations of sulfate, sulfide, iron and arsenic in groundwater mainly through AVS precipitation/dissolution and ES disproportionation reaction.

Poyang Lake is characterized by significant water level fluctuations, leading to complex transformation processes among precipitation, soil water, and groundwater. Due to the limitations of intricate wetland conditions and traditional monitoring methods, it is challenging to conduct quantitative studies on soil water movement and its interaction with groundwater. In this study, three vegetation communities at different elevations in Poyang Lake were investigated to analyze the isotopic composition of precipitation, lake water, groundwater, and soil water（0~80cm）. The characteristics of wetland soil water movement were examined across various hydrological periods. The results showed that the slope of the soil evaporation line（SEL）in the Artemisia capillaris community（5.91）was significantly lower than that of the local meteoric water line（LMWL, 7.60）. The lc-excess values of soil water in 0~60cm layer were negative, indicating strong evaporation, with a maximum impact depth of 60 cm. The slopes of the SEL in the Phragmites australis and Carex cinerascens communities（6.70 and 6.75, respectively）were slightly lower than the LMWL, and the lc-excess values of soil water were close to 0, indicating minimal evaporation. Regarding soil water movement, the δ¹⁸O values of soil water in the A. capillaris community increased with depth during spring（May）and summer（June to August）, indicating piston-flow dominated transport. During autumn（September and October）, soil water δ¹⁸O values became enriched and decreased with depth, indicating the dominant influence of evaporation. Furthermore, the soil water δ¹⁸O values in the A. capillaria community were significantly enriched compared to groundwater isotopes. No depleted isotope signals or evidence of groundwater supply were detected in the soil water, even when the groundwater table was at its shallowest（1.92m）. These results suggest that vertical hydrological connectivity between root-zone soil water and groundwater was blocked. In contrast, soil water movement in the P. australis and C. cinerascens communities was significantly influenced by groundwater level fluctuations. During the groundwater level rise period（April and May）, shallow soil water（0~40cm）in these two communities primarily originated from atmospheric precipitation, while deep soil water（40~80cm）was replenished by capillary rise of groundwater. Groundwater contributed more than 50% to the replenishment of root-zone soil water. During the shallow groundwater table period（June and August）, frequent exchanges occurred between soil water and groundwater in the P. australis community. In the groundwater table decline period（September and October）, the P. australis and C. cinerascens communities exhibited non-uniform soil water flow processes, characterized by noticeable preferential flow.

The Dongjiang River Basin was chosen as the study area to compare the nitrogen concentrations and isotopes in the river with different land uses, so as to provide a better understanding and evidence for impacts of urbanization on active nitrogen turnover. In this study, the distinct characteristics of nitrogen concentrations and isotopes were found in urbanized rivers compared to rivers with other land uses. Firstly, the nitrogen concentrations in urbanized rivers were gradually increased due to urbanization and nitrate has become a main nitrogen speciation. Secondly, based on the isotope Rayleigh fractionation model, it was found that the nitrification potential in urbanized river channels was enhanced and about 25.8% of nitrate nitrogen came from nitrification in situ. In addition, a positive correlation between ln（NO₃^--N）and δ¹⁵N-NO₃^- was recorded in urbanized rivers. Moreover, Δδ¹⁵N/Δδ¹⁸O in the dry and wet seasons were –2 and -6, respectively, indicating that the denitrification potential was weakened to provide evidence for nitrate accumulation in urbanized river channels. Likewise, a weak correlation between δ¹⁵N-PN and δ¹⁵N-NH₄⁺ was also recorded in urbanized rivers, and the ¹⁵N enrichment factor of nitrate assimilation also differed from the theoretical value, indicating a weak assimilation of ammonia and nitrate nitrogen. Finally, more input pathways and less sink processes of nitrogen in urbanized rivers have become a key mechanism for elevated riverine nitrogen concentrations in the lower reaches of Dongjiang river.

Using the Gansu section of the Yellow River Basin as the research object, Fragstats 3.3 software and Pearson correlation analysis method were used to calculate the landscape pattern index of the river buffer zone, analyze the correlation between water quality and landscape pattern indicators, and investigate the factors influencing the water quality of the Yellow River’s main stream and tributaries in Gansu Province. The data included the land use data with the resolution of 30m in 2020, water quality monitoring data, and socio-economic data from 2018 to 2021. The results indicated that:（1）From 2018 to 2021, the water quality of the main stream and tributaries of the Yellow River in Gansu Province were improving, except the Taohe River, where the concentration of water quality indicators was in the increasing trend；however, TN at more than 80% of monitoring sites remained above Class V water quality standards, with significant nitrogen pollution persisting in the Weihe River, Jinghe River, and Zhuanglang River. High concentrations of TN and NH₄⁺-N were mainly distributed in the central and eastern parts of the basin, TP levels were elevated across most areas, and COD was dispersed, with hotspots concentrated in parts of Lanzhou City and central Linxia Hui Autonomous Prefecture.（2）A significant correlation was observed between landscape patterns and water quality indicators. Higher aggregation and connectivity of landscape patches were associated with better water quality, whereas higher levels of fragmentation and dispersion increased the risk of water pollution.（3）Water quality indicators exhibited strong spatial heterogeneity. The driving factor analysis revealed that NH₄⁺-N, TP, permanganate index, and COD were primarily influenced by rural activities, while TN and DO were mainly affected by urban living and industrial production.

This study utilized natural red clay（RC）and 700°C calcined red clay（CRC-700）to form treatment groups combined with submerged macrophytes Vallisneria spiralis（VS）and Ceratophyllum demersum（CD）, aiming to develop a treatment technology effective in controlling sedimentary phosphorus（P）release. The results demonstrated that the VS+CRC-700 treatment group exhibited superior performance in reducing and removing sedimentary P compared to other treatments. Specifically, dissolved reactive phosphorus（SRP）in the overlying water of the VS+CRC-700 group was significantly reduced from 1.38 mg/L to 0.024 mg/L compared to the control group. Additionally, the concentrations of Fe（II）-P and iron-aluminum bound phosphorus（CDB-P）in different sediment layers were maximally decreased by 94 and 488.03 mg/kg, respectively. Meanwhile, the VS+CRC-700 treatment markedly enhanced P immobilization in sediments, with Ca-P content increasing by up to 182.78mg/kg across sediment layers. Furthermore, microbial community analysis revealed that VS+CRC-700 increased sediment microbial abundance by 5403 units, while reducing the relative abundances of Proteobacteria and Bacteroidetes by 16.56% and 33.33%, respectively. These findings collectively suggest that VS+CRC-700 represents a cost-effective and high-efficiency technology for improving water quality in P-polluted systems. Its application demonstrates significant potential in controlling sedimentary P release under weak hydrodynamic conditions.

The Taihangshan-Yanshan region serves as a crucial ecological barrier for the Beijing-Tianjin-Hebei area. Investigating the spatiotemporal patterns of vegetation growth and their influencing factors holds significant importance for implementing ecological conservation and restoration decisions. The MOD13A2.061NDVI dataset was obtained through the Google Earth Engine（GEE）platform, and the kernel Normalized Difference Vegetation Index（kNDVI）was further calculated. The spatiotemporal heterogeneity of vegetation cover was analyzed using the Theil-Sen Median method, coefficient of variation method, and Hurst index method. Subsequently, the optimal parameter geographical detector（OPGD）method was employed to identify the multivariate driving mechanisms behind its spatiotemporal differentiation. Results demonstrated that: From 2001 to 2020, the kNDVI in the study area showed a gradual increasing trend during spring, summer, and autumn, while exhibiting a decreasing trend in winter. The annual mean kNDVI displayed a spatial distribution pattern characterized by "higher values in northern and southern regions, lower in central areas", with significant spatial variability. The area with increased kNDVI（66.36%）was larger than that with decreased kNDVI（33.64%）. Weak anti-persistence and weak positive persistence coexisted, collectively accounting for 99.26% of the total area. Approximately 80% of the region maintained kNDVI fluctuations at moderate or lower levels. OPGD analysis revealed that the primary drivers of kNDVI changes included evapotranspiration, land surface temperature, land use type, soil type, and vegetation type（all with q-values greater than 0.20）. The interaction effects between land surface temperature and annual average temperature, and between land surface temperature and cumulative precipitation demonstrated particularly strong explanatory power, exceeding 0.50 and 0.47 respectively. Higher kNDVI values were observed when evapotranspiration ranged within（634mm, 814mm], land surface temperature fell within [5.2°C, 11.2°C], and urban population remained in（216000, 280000）.

Based on the analysis of the material composition and mercury（Hg）content in the surface sediments of the Yellow River subaqueous delta, the distribution characteristics and influencing factors of Hg in the region were examined. The results showed that the Hg content in the surface sediments ranged from 15.09 to 53.11µg/kg, with an average content of 36.32µg/kg, which was relatively low compared to other domestic and international marine areas. The Hg content in the sediments exhibited a'low-high-low-high' pattern from the shore to the sea, with peak concentrations observed at the shear front and in the fine-grained sediment areas offshore. Elevated Hg levels were also found in the sediments near Laizhou Bay in the southern region. Hg was primarily derived from natural sources but was also influenced by emissions from human activities. Hydrodynamic conditions played a crucial role in controlling the distribution of Hg, with a tendency for Hg to accumulate in fine-grained sediments. The 'filter' effect of the estuary, especially the shear front, significantly influenced the spatial distribution of Hg and its transport to the open sea. The distribution of Hg was also related to its carriers, such as organic carbon, carbonate minerals, and iron-manganese oxides. These carriers directly bound with Hg, affecting its distribution, and also influenced the properties of the sediments, thus indirectly influencing the distribution of Hg.

Hypoxia has become a prevalent phenomenon in the plain river network region. To reveal the causes of hypoxia in these regions, the Sihu Canal in the Hanjiang River Basin, one of China's most important freshwater aquaculture areas, was selected as a case study. The spatiotemporal variations in water quality, including dissolved oxygen（DO）and nutrients, were analyzed for the period 2010~2023, and the spatial distribution of nutrients in water and sediments were investigated. The impact of parameters such as water temperature, ammonia nitrogen, and flow on DO levels in the water was evaluated using a Random Forest model. The results indicated significant seasonal fluctuation in DO levels, which exhibited a 'V'-shaped pattern throughout the year. DO concentrations were relatively low during flood seasons, while during non-flood seasons the requirements for Class III surface water quality were generally satisfied. In 2021, severe hypoxia（DO<2mg/L）was observed, with the annual hypoxic days amounting to 79,116, and 96 at the Yunlianghu, Xinhecun, and Xintan sections respectively. Evident hypoxic zones were identified in the mid- and upstream sections of the Sihu Canal, where DO concentrations ranged from 2.61 to 3.22mg/L. From 2010 to 2023, the water quality of the Sihu Canal consistently ranged from Class IV to Class V, with occasional further deterioration recorded. The main parameters exceeding the standards were identified as DO, permanganate index, ammonia nitrogen, and total phosphorus. The total nitrogen and phosphorus contents in the sediments ranged from 857.70 to 2846.87mg/kg, and 545.99 to 2475.59mg/kg, respectively, indicating that the sediments were subjected to mild to moderate pollution, with tributaries being more polluted than the main canal. High accuracy in predicting DO levels was demonstrated by the Random Forest model, which yielded an R² of 0.995 and an RMSE of 0.2085. Water temperature had a relative importance exceeding 35% in influencing DO levels, followed by pH, ammonia nitrogen, conductivity, turbidity, and flow. To mitigate the hypoxic conditions during flood seasons, it was recommended that the systematic management of the basin be strengthened, the water quality of shrimp-rice and aquaculture drainage systems be improved, and the operation and scheduling of pump stations be optimized.

In response to the current limitations of the Fe²⁺/periodate（PI）system, which is difficult to sustain effective performance and is merely applicable under acidic conditions, a system of visible light（VL）and 3,4,5-Trihydroxybenzoic acid（TA）cooperating with Fe³⁺ for activating PI was constructed. The results indicate that the combination of VL and TA can accelerate the redox cycling between Fe³⁺/Fe²⁺, significantly enhancing the performance of activating PI. The VL/TA/Fe³⁺/PI system can achieve the complete degradation of sulfadiazine（SD）within 30min, with better efficacy under neutral and acidic conditions. Anions such as Cl⁻, NO₃⁻, and SO₄²⁻ have minimal effects on SD removal, whereas the existence of HCO₃⁻ significantly inhibits SD elimination. At the same time, humic acid（HA）exhibits a promoting effect. Quenching tests and electron paramagnetic resonance（EPR）analysis confirmed that hydroxyl radicals（HO•）and singlet oxygen（¹O₂）were the primary reactive species responsible for SD removal. Based on mass spectrometry analysis, 6degradation intermediates were verified, and 3 possible degradation pathways for SD were proposed. Using radish as a model organism for phytotoxicity assessment, it was demonstrated that the toxicity of SD-contaminated water was significantly reduced after treatment. Simultaneously, the system exhibited excellent treatment efficiency in various real water matrices. Furthermore, this system exhibits favourable degradation performance for multiple typical emerging contaminants prevalently existing in natural water bodies, indicating broad application prospects.

The study analyzed the effects of different mulching durations（4 to 19 years）on the characteristics of microplastics in the soil of peanut fields. The results showed that as the mulching duration increased, the abundance of microplastics in the soil tended to rise. Compared with a mulching duration of 4 years, the abundance of microplastics in the soil with a mulching duration of 19 years varied between 660 and 3150 pieces/kg. The abundance of microplastics with a small particle size（<2mm）increased with both the mulching duration and soil depth. Long-term continuous mulching promoted the penetration of microplastics into deeper soil layers, which was specifically reflected in the fact that microplastics with a small particle size accounted for 49.9% in the 20~30cm soil layer. In sampling points with different mulching durations and soil depths, the color of microplastics was predominantly transparent, followed by black, green, and purple, while other colors such as red had relatively lower proportions. The shapes of microplastics included fibrous, foamy, film-like, fragmental, and granular, with fibrous shapes being the most dominant. Moreover, the polymer types of microplastics were diverse, mainly consisting of PE（polyethylene, 34.2%）, PP（polypropylene, 17%）, and PS（polystyrene, 16.3%）. In summary, the increase in mulching duration significantly affected the proportion of transparent microplastics in the soil, but had no significant impact on the types of microplastics and polymers.

The UV/O₃/PS process was used for the degradation experiments of chloramphenicol, the degradation performance of the combined UV/O₃/PS process, UV/PS, O₃/PS and UV/O₃ processes was investigated, the contribution of major active free radicals to CAP degradation was analyzed for the reaction system, the effects of PS concentration, O₃ concentration, pH, and the common inorganic anions and natural organics on the degradation were examined respectively, the degradation pathway of CAP and the formation potential of disinfection by-products were clarified, also the calculation of energy consumption for the UV/O₃/PS process was discussed. The results showed that the CAP removal by the combined UV/O₃/PS process was 90.41% at 60min. ¹O₂, HO· and SO₄⋅^- were the three main active species in the reaction system, and their contributions to CAP degradation were 53.85%, 25.64% and 12.82% in turn. the increase of PS and O₃ concentrations favored the degradation of CAP, and alkaline conditions could promote the degradation of CAP, co-existing Cl^-, HCO₃^- and humic acid inhibited the degradation of CAP. the degradation mechanism of CAP by the UV/O₃/PS system mainly involved the hydroxylation, amino oxidation and C-N bond breaking or something. The formation potential of trichloromethane and trichloroacetonitrile was significantly increased through CAP pre-oxidation treatment, the formation potential for trichloromethane increased from 30.35µg/L to 48.08µg/L and that of trichloroacetonitrile from 12.31µg/L to 20.97µg/L. Energy consumption evaluation showed that the UV/O₃/PS process has a better overall efficiency.

Antibiotic resistance was recognized as one of the most critical public health challenges confronted by humanity in the 21 st century. Metal nanomaterials were regarded as potent alternatives in the post-antibiotic era, attributed to their exceptional biocidal efficacy and tunable properties. However, it was demonstrated through recent studies that not only could resistance to nanomaterials themselves be developed by bacteria, but the physiological characteristics of bacteria could also be altered, consequently leading to enhanced antibiotic resistance. The antibiotic resistance variations induced by metal nanomaterials were systematically reviewed, with underlying mechanisms being elucidated through three key aspects: the interfacial interactions between nanomaterials and bacterial membranes, the occurrence of bacterial genomic mutations, and the horizontal transfer of resistance genes. This investigation was designed to establish a theoretical framework for innovating next-generation nano-antimicrobial agents, while simultaneously promoting the application of nanomaterials in combating antimicrobial resistance on a global scale.

CoFe₂O₄@MoS₂ was prepared by the hydrothermal method and used to activate permonosulfate（PMS）for the degradation of ciprofloxacin（CIP）in water. The successful preparation of CoFe₂O₄@MoS₂ was confirmed by the characterization results obtained from SEM and XRD. Degradation results showed that the removal rate of CIP in the CoFe₂O₄@MoS₂/PMS system can reached 74.38% in 120minutes, which is higher than the sum of the individual CoFe₂O₄@MoS₂ and PMS systems, verifying the activation ability of CoFe₂O₄@MoS₂ on PMS. The quenching experiment results indicated that the main oxidative active species in the system are ^●OH、SO₄^●- and ¹O₂, with SO₄^●- and ¹O₂ playing a major role in the degradation of CIP. Based on density functional theory combined with HPLC analysis, eight possible products were obtained and two possible degradation pathways of CIP were proposed. The environmental risks of the degradation products were evaluated and predicted using the TEST program, and it was shown that, compared with the parent compound, most products exhibited reduced acute toxicity, weakened mutagenicity, decreased bioaccumulation and developmental toxicity, and significantly lower ecotoxicity. Additionally, the CIP removal rate of the CoFe₂O₄@MoS₂/PMS system can still reached 60.04% after four cycles, and the XRD results demonstrated that the crystal structure of the catalyst did not undergo significant changes before and after the reaction, indicating the high efficiency and stability of the catalyst.

To investigate the impact of density currents brought by the mainstream of Yangtze River on the distribution of dissolved CH₄ in its tributaries, three representative tributaries-Xiaojiang, Daning, and Shennong Rivers were selected as the study sites. Spatial measurements of dissolved methane（CH₄）concentrations in the surface water were conducted using a Fast-Response Automated Gas Equilibrator（FaRAGE）coupled with a greenhouse gas analyzer. The results were shown to vary in CH₄ concentrations among the tributaries, with average concentrations being（0.06±0.02）µmol/L in Xiaojiang,（0.17±0.12）µmol/L in Daning, and（0.16±0.14）µmol/L in Shennong Bays. The CH₄ concentrations in these three bays were also found to exhibit distinct spatial heterogeneities. In Xiaojiang Bay, a pattern was observed where high surface concentrations and low bottom concentrations were present in the midstream, while higher concentrations were found at the bottom compared to the surface in both the upstream and downstream areas. Comparable distribution patterns of CH₄ concentrations were noted in Daning Bay and Shennong Bay, characterized by higher concentrations upstream compared to downstream, and higher concentrations at the bottom layer relative to the surface layer. It was found that the distribution of dissolved CH₄ concentrations in the tributary bays was influenced by environmental factors. Furthermore, the density currents from the mainstream were not only found to dilute the dissolved CH₄ concentrations in the bays but also indirectly altered their distributions by influencing the hydrological and hydrodynamic processes within the tributary bays. The integrated effects revealed the complex dynamic processes of CH₄ production and consumption within the bay ecosystems, which were of great significance for understanding and predicting the greenhouse gas emissions from the bays of the Three Gorges Reservoir.

Under the synergistic advancement of global climate governance and China's "Dual Carbon" strategy, the development of forestry carbon sink systems urgently required breakthroughs in carbon quantification bottlenecks within seedling production. Edible raw material forests played an important role in improving the ecological environment and increasing economic growth, and estimating the carbon footprint of seedling production was crucial for assessing the carbon sink of forestry. By surveying existing star anise nursery operations for primary data in Guangxi, a new process-based life cycle inventory（LCI）dataset an 8cm×12cm star anise seedling of a typical edible raw material forest production system was created, covering three stages from seed collection to the transportation of seedlings to retailers. Incorporating the new LCI data into life cycle assessment（LCA）method, the total global warming（GW）impact of a star anise seedling was 0.145kgCO₂e, of which energy and materials consumption constituted 57.2% and 28.8% of total emissions. Electricity use is dominated by irrigation demands（75.9%）and water was estimated to be just over half of these emissions（60%）. Among the production activities, the total environmental impact of the product was dominated by the irrigation at the field container seedling stage, which contributed 0.07kgCO₂e/seedling. In this case, the change in energy consumption had a notable impact on the carbon footprint, with a sensitivity of 0.804. Among them, the input of diesel had the largest impact on carbon footprint（42.4%）. The results indicated that optimizing clean energy structures and implementing efficient water and nutrient management strategies could significantly reduce carbon emissions during seedling cultivation and offered practical guidance for advancing carbon labeling systems for edible forest products and supported forestry carbon neutrality progress.

The rapid detection of biological toxicity of Marine pollution is of great significance to the emergency monitoring of sudden Marine water pollution accidents, the rapid investigation and evaluation of Marine environment ecological risks, and the protection of Marine environment. However, existing biological toxicity detection methods have a long toxic response time, and it is difficult to realize the rapid response of Marine pollutants. In view of this, this study has taken the active marine microalgae, Platymonas subcordiformis, as the test organism to study its mobility response to typical heavy metal pollutants Mercury（Hg）and Chromium（Cr）in seawater, in order to provide a basis for establishing a rapid detection method for marine biological toxicity. The results ha showed that within 2h, the motion parameters of the Platymonas subcordiformis, including movement mode, movement ability, and swimming velocity, exhibited significant response characteristics to 0.075~2.5mg/L Hg and 0.1~3mg/L Cr, and there was a good dose-response relationship between the motion parameters and the concentrations of the two independent heavy metals；The 2h-EC₅₀ values of Hg and Cr obtained based on different motion parameters were 0.63~2.38mg/L and 0.60~2.49mg/L, respectively；Overall, among different motion parameters, the curve velocity（VSL）has the most sensitive response to the toxicity of heavy metals Hg and Cr. The 2h-EC₅₀ values of Hg and Cr obtained using VSL as the response index are 0.63 and 0.60mg/L respectively. The above results are comparable to traditional toxicity tests（including microalgae 72-hour growth inhibition test, 24~48 hours photosynthesis inhibition test, and 96-hour fish death test）, and the toxicity response time is significantly reduced, indicating that microalgae motility as a new biological testing indicator can quickly and effectively evaluate the toxicity of marine heavy metal pollutants.

This study investigated the relationship between Dicer expression levels and urinary arsenic metabolites both in vivo and in vitro, as well as examined the role of Dicer in cell proliferation. For the epidemiological analysis, workers from a high arsenic-polluted factory in Yunnan Province were selected as the arsenic-exposed group, while residents from nearby villages without arsenic exposure history were recruited as controls. Urinary arsenic species（inorganic arsenic, monomethylarsonic acid [MMA], and dimethylarsinic acid [DMA]）were quantified, and Dicer mRNA expression levels in peripheral blood were measured. It was found that the relative Dicer mRNA expression in the arsenic-exposed group was significantly elevated compared to controls. Furthermore, Dicer mRNA levels were positively correlated with urinary inorganic arsenic, MMA, and DMA concentrations. For in vitro experiments, human bronchial epithelial cells（16HBE）were treated with sodium arsenite（1.5, 3, 4.5µmol/L）or 4.5µmol/L MMA, DMA, or sodium arsenite. Dicer mRNA and protein expression were analyzed by RT-qPCR and Western blot. Additionally, Dicer expression was knocked down in 16HBE cells using siRNA, and cell viability and proliferation were assessed via CCK-8 and EdU assays. It was observed that Dicer mRNA and protein levels in 3 and 4.5µmol/L sodium arsenite-treated cells were significantly upregulated compared to untreated controls, whereas no changes were detected in MMA- or DMA-treated groups. Knockdown of Dicer was shown to suppress cell viability and proliferation. Notably, sodium arsenite exposure combined with Dicer knockdown resulted in a more pronounced reduction in cell proliferation rates.

To elucidate the potential ecological risks of carbon dots, a novel nanomaterial, this study investigated the physiological responses and underlying mechanisms of the freshwater microalgae Euglena gracilis following exposure to pristine carbon dots（CDs）and Cu-N-doped carbon dots（Cu-CDs）. The results demonstrated that both types of carbon dots initially promoted but subsequently inhibited the growth of E. gracilis over time. Compared to CDs, Cu-CDs exerted a more pronounced impact on key physiological processes, including photosynthesis and antioxidant defense. Exposure to 1mg/L and 10mg/L Cu-CDs resulted in the accumulation of photosynthetic pigments and a decline in photosystem II activity, whereas a significant change in photosynthetic pigment content was observed only at 10mg/L in the CDs-exposed group. The maximum inhibition rates of superoxide dismutase activity induced by CDs and Cu-CDs were 62.52% and 78.35%, respectively. Metabolomics analysis further confirmed that Cu-CDs triggered a stronger metabolic disturbances, with the most notable alterations observed in lipid metabolism pathways, indicating compromised membrane stability of E. gracilis. Disruptions in amino acid and photosynthetic metabolism pathways were primarily attributed to oxidative stress. Additionally, both CDs and Cu-CDs affected energy metabolism by altering in alanine, aspartate, and glutamate metabolism, as well as glycolysis/gluconeogenesis pathways. Overall, the impairment of photosynthetic and antioxidant system may represent the primary toxic mechanisms of carbon dots in E. gracilis.

Based on the methodology of life cycle assessment（LCA）, the carbon footprint of the typical wind power system with generation and electricity storage（WPSGES）in China was calculated, so as to identify the reduction potential of carbon emission from life cycle stages. The results showed that the carbon footprint of WPSGES was 8.44gCO₂/（kW·h）, which mainly came from the manufacturing process by 6.25gCO₂/（kW·h）（74.05%）. Such processes as construction, operation, and end of life only contributed 1.04, 1.91 and -0.74gCO₂/（kW·h）, respectively. It was also confirmed that expanding the system boundary, including power generation and storage, could reduce gross carbon footprint of WPSGES.

This study conducted a comprehensive life cycle assessment of the carbon footprint associated with the solidification/stabilization combined with barrier backfilling（SSB）technology through a typical heavy metal-contaminated site case in South China. Using the emission factor method and life cycle impact assessment approach, we quantified the environmental impacts across the entire remediation process. The results revealed that the SSB technology exhibited a carbon emission intensity of 0.190t CO₂/m³ contaminated soil. The most important carbon emission unit processes were primary treatment（33.7%）, site construction（32.7%）, and barrier backfilling（31.9%）. Material production emerged as the principal emission source, with concrete manufacturing contributing 51.9% and solidification/stabilization reagents accounting for 33.4% of total emissions. The comprehensive environmental impact score of this case reached 84.3kPt. The implementation process of risk control exerted the most significant human health impacts, which were primarily contributed by the formation of fine particulate matter during construction activities and the global warming potential.

Based on panel data of 284 cities at or above the prefecture level in China from 2012 to 2022, this paper studied the impact of new quality productivity on green innovation efficiency and the moderating effect of urbanization in this process by using fixed effect model, moderating effect model and general nesting spatial model. It was found that:（1）New quality productivity was confirmed to significantly enhance green innovation efficiency, a conclusion that still held after a series of robustness tests.（2）The promoting effect of new quality productivity on green innovation efficiency was most significant in the eastern region, followed by the central region, while no significant impact was observed in the western region.（3）Urbanization played a positive moderating role in the process of new quality productivity promoting green innovation efficiency.（4）New quality productivity was shown to generate positive spatial spillover effect that effectively improved green innovation efficiency of neighboring regions. Therefore, it was recommended to actively cultivate new quality productivity, optimize the innovation environment according to regional characteristics, vigorously promote the green urbanization process, and establish efficient regional cooperation mechanism to fully unleash the potential of new quality productivity and accelerate the green transformation of the economy and society.

In order to quantitatively analyze the impact of inspection and enforcement on the autonomous acceptance system towards regional environmental qualities, 47870public administrative penalty cases of illegal autonomous acceptance from 2018 to 2023 have been collected. Correlation analysis has been conducted on simulated environmental qualities based on penalty cases with real regional environmental qualities on 13 provinces that had been national warned for bad environmental qualities. Research found a significant correlation between combined autonomous acceptance and general enforcement with environmental qualities. A goodness of fit at R²=0.8051was found when bringing the percentage of autonomous acceptance cases over all administrative penalty cases as the second variable besides average penalty frequency. Yet found no significant correlation between general environmental enforcement and environmental qualities. Therefore, it was suggested that the inspection and enforcement on autonomous acceptance system leveraged more impact on environmental qualities than general environmental inspection and enforcement. The case analysis found that there was no significant difference in the fine amount for cases of "fraud" in autonomous acceptance compared to other cases. Legal analysis has found that there was a certain degree of functional overlap between autonomous acceptance and Pollutant discharge permit system, but there were still significant differences between the two in terms of regulatory objects and regulatory content.