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.

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.

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.

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%）.

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.

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.

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.

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.

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.

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.