Article(id=1320100097862520930, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320100076526097192, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20240162, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1709049600000, receivedDateStr=2024-02-28, revisedDate=1715788800000, revisedDateStr=2024-05-16, acceptedDate=null, acceptedDateStr=null, onlineDate=1792665989603, onlineDateStr=2026-10-22, pubDate=1729353600000, pubDateStr=2024-10-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792665989603, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792665989603, creator=13701087609, updateTime=1792665989603, updator=13701087609, issue=Issue{id=1320100076526097192, tenantId=1146029695717560320, journalId=1263187385517883426, year='2024', volume='52', issue='10', pageStart='3091', pageEnd='3348', issueExtLink='null', onlineDate='null', pubDate='1729353600000', pubDateStr='2024-10-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792665984517, creator='13701087609', updateTime=1792666283372, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320101330077733325, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320100076526097192, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320101330077733326, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320100076526097192, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=3115, endPage=3121, ext={EN=ArticleExt(id=1320100098118373475, articleId=1320100097862520930, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Microbial Remediation and Resource Utilization for Chromium Pollution in Sites, columnId=1321897876628816588, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Environmental Mineral Materials—Research Article, runingTitle=null, highlight=null, articleAbstract=
Introduction In China, thousands of tons of highly toxic hexavalent Cr slags are produced annually. The existing remediation technologies face challenges due to the facile oxidation, "re-yellowing" effects, and contamination from iron additives, hindering the achievement of sustained governance and resource recycling for Cr pollution. This study conducted microbial mineralization experiments on soil at actual Cr-contaminated sites, delving into the stability, recyclability, and reaction mechanisms of mineralization products. The results indicate that this method can efficiently reduce Cr6+ and Fe3+ in Cr slag to form precipitates. After 60 d extensive air exposure, the mineralized products exhibited little reoxidation or re-decomposition, and demonstrated weak magnetism, indicating a potential for recovery by magnetic separation. This paper was to investigate a low-cost, efficient in-situ, and long-term governance solution for treatment of Cr pollution on-site and facilitation of the recovery and reuse of Cr resources.
Methods Cr-contaminated soil samples were collected in Henan province, China. The pH value, total Cr, and total Fe concentrations of the soil were measured. Shewanella oneidensis MR-1 (S. MR-1) was cultured and acclimated to high concentrations of Cr6+ and alkaline conditions to enhance its reduction capabilities. In the microbial reduction experiments, S. MR-1 was added into Cr-contaminated soil at different concentrations of Cr6+, Cr3+, and Fe2+.
The microbial morphology and surface elemental composition of the samples were determined by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS). The microstructure of the samples was analyzed by transmission electron microscopy with energy dispersive X-ray spectroscopy (TEM-EDS). The concentrations of Cr6+ and Fe2+ were measured by ultraviolet-visible spectrophotometry (UV-Vis). The magnetic properties of the eaction products were characterized by vibrating sample Magnetometry (VSM). The Cr valence states before and after remediation were analyzed by X-ray photoelectron spectroscopy (XPS). The concentrations of Cr and Fe were determined by inductively coupled plasma emission spectroscopy (ICP).
Results and discussion The results show that S. MR-1 significantly reduces Cr6+ in the contaminated soi and the Cr6+ concentration decreases to detectable limits for 4 d treatment. Concurrently, the concentration of Cr3+ initially increases and then stabilizes, indicating the formation of stable Cr precipitates. The Fe2+ concentration increases after most of Cr6+ reduces, showing the simultaneous reduction of Fe3+ in the soil.
Based on the evaluation of the stability of the remediation products for 60 d, the treated soil has a minimal release of Cr3+ and no reoxidation to Cr6+, even when exposed to environmental conditions. This stability is attributed to the formation of stable mineral phases, which are confirmed by VSM and XPS.
The microbial reduction process results in the consumption of soil organic matter, which favors preventing the formation of soluble Cr3+ complexes that can be reoxidized. The mineralization control process of Cr-contaminated soil mediated by S. MR-1 can be divided into three stages, i.e., S. MR-1 decomposes soil organic matter, produces OH-, creates an alkaline environment, and transfers the obtained electrons to the solution and Cr6+ and Fe3+ in the soil, generating Cr3+ and Fe2+; Microorganisms inhibit the binding of Cr3+ with organic matter, engage in ion exchange with the environment, and Fe3+, Cr3+, and Fe2+ are adsorbed on the cell surface or enter the cell body, forming stable minerals under the control of microorganisms, which belongs to the microbial-controlled mineralization mechanism. Microbial secretion of extracellular polymeric substances (EPS) regulates the surrounding environment to achieve mineral precipitation conditions, inducing the mineralization of Cr3+, Fe3+, and Fe2+, which belongs to the microbial-induced mineralization mechanism. The minerals generated in the solution due to their higher density than water deposit at the bottom of the solution, forming a black mineral layer; and S. MR-1 continuously decomposes organic matter in the soil, reducing excess Fe3+ to produce Fe2+ and maintaining a reducing environment.
Conclusions This study introduced the use of the dissimilatory metal-reducing bacterium S. MR-1 for the treatment of substantial iron in the existing Cr-contaminated sites. The introduced microorganisms utilized soil organic matters to generate an alkaline environment favorable for mineralization. Within a short time frame, they reduced all Cr6+ to Cr3+ and some Fe3+ to Fe2+, thereby facilitating the controlled formation of stable phases of Cr3+, Fe3+, and Fe2+, intracellularly and extracellularly. The microbial treatment products exhibited the structural and valence state stability under prolonged oxidative conditions, preventing the release of Cr ions into the environment. Also, the product had a degree of magnetism, offering a cost-effective solution for subsequent resource recovery. This method could overcome the limitations of conventional microbial in-situ remediation technologies (i.e., extended treatment durations, intolerance to high Cr concentrations, and poor product stability). This work could address the challenge of unstable and easily re-oxidized products at Cr-contaminated sites, providing an economically viable solution for Cr pollution remediation in diverse environments, i.e., surface water, groundwater, and soil with varying pollution levels. Moreover, this work could give a basic foundation for low-cost Cr resource recovery.
, authors=Tianci HUA, Yan LI, Yanzhang LI, Anhuai LU, Hongrui DING, Changqiu WANG, Xiang JI, authorsList=Tianci HUA, Yan LI, Yanzhang LI, Anhuai LU, Hongrui DING, Changqiu WANG, Xiang JI, authorCompany=null, correspAuthors=Yan LI, authorNote=
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中国是世界最大的铬资源消耗和铬污染排放国，每年产生万吨级的高毒性六价铬铬渣。现有修复技术存在易氧化“返黄”、含铁添加剂污染等难题，无法实现铬污染的长效治理与资源化再利用。本工作对实际铬污染场地土壤开展了碱性条件下的微生物矿化实验，探讨了矿化产物的稳定性、可回收性与反应机理。结果表明，该方法能高效还原铬渣中的六价铬和三价铁产生含三价铬的矿化物。与空气充分接触长达60 d后，矿化产物仍未出现再氧化和再分解等现象，且具有弱磁性，具备磁选回收潜力。本工作为解决场地铬污染与铬资源回收再利用问题提供了一种低成本、高效率的原位、长效治理方案。
, authors=化天赐, 李艳, 黎晏彰, 鲁安怀, 丁竑瑞, 王长秋, 姬翔, authorsList=化天赐, 李艳, 黎晏彰, 鲁安怀, 丁竑瑞, 王长秋, 姬翔, authorCompany=null, correspAuthors=李艳, authorNote=
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李艳（1982—），女，博士，副教授。
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化天赐（1998—），男，博士研究生。
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