生物硫化微米铁修复三氯乙烯污染地下水效能的研究：粒径和硫酸盐浓度的影响

鲁佳晖; 孟韦冉; 王祎涵; 周千一; 辛佳

doi:10.13205/j.hjgc.202602008

生物硫化微米铁修复三氯乙烯污染地下水效能的研究：粒径和硫酸盐浓度的影响

doi: 10.13205/j.hjgc.202602008

中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室山东省海洋环境地质工程重点实验室, 山东青岛 266100

基金项目:

国家自然科学基金面上项目（42477069）

详细信息

作者简介:
鲁佳晖（1999—），女，硕士研究生。llu_jiahui@163.com

通讯作者:
辛佳（1985—），女，教授，博导，主要从事土壤/地下水中有害物质的迁移转化行为与控制原理研究。xinj15@ouc.edu.cn

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出版历程
- 收稿日期: 2025-01-10
- 网络出版日期: 2026-04-11
- 刊出日期: 2026-02-01

Remediation of trichloroethylene-contaminated groundwater using bio-sulfidized micrometer-sized iron： roles of particle size and sulfate concentration

Key Lab of Marine Environment and Ecology, Ministry of Education & Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China

摘要

摘要: 采用生物硫化技术对不同粒径mZVI进行改性，系统考察了mZVI粒径和硫酸盐浓度对mZVI去除TCE效能的影响，并深入探讨了其作用机理。结果表明，mZVI粒径显著影响了生物硫化效果和TCE的去除效率。7 μ粒径的ZVI凭借其较大的比表面积，表现出最快的去除速率，其值为0.16 d^-1。但其易发生团聚且可能对微生物产生毒性抑制微生物生长，导致生物硫化程度最低。相比之下，40 μm粒径的ZVI生物硫化后，还原性S含量最高，达81.92%，且反应活性显著优于同粒径化学硫化组，即生物硫化对大粒径mZVI的改性效果更佳。此外，硫酸盐浓度对mZVI的脱氯性能影响显著。硫酸盐的增加为硫酸盐还原菌的生长创造了有利的环境条件，提高了mZVI表面还原性S的含量，从而增强了S-mZVI的脱氯效果。当硫酸盐浓度达到700 mg/L时，S-mZVI可在24 d内完全去除TCE。脱氯产物结果表明：硫酸盐浓度与脱氯清洁程度呈正相关，高浓度硫酸盐条件可促进TCE分子中氯原子的彻底脱除。研究可为TCE污染地下水开展生物硫化微米铁修复提供理论指导和技术支撑。
- 微米铁 /
- 微生物 /
- 粒径 /
- 硫酸盐浓度 /
- 三氯乙烯
Abstract: Trichloroethylene （TCE）， a typical halogenated organic pollutant in groundwater， poses a serious threat to groundwater ecosystem and human health. Micrometer-sized zero-valent iron （mZVI） has attracted considerable attention for its ability in removing TCE. To further enhance the reactivity of mZVI， sulfidation modification is often employed. While traditional chemical sulfidation can improve the reactivity of mZVI， it suffers from high chemical reagent consumption and environmental pollution. In contrast， biological sulfidation， which utilizes sulfide produced by microbial metabolism to modify mZVI， is more environmentally friendly and cost-effective. However， the mechanisms underlying the effects of mZVI particle size and sulfate concentration on the sulfidation efficiency and dechlorination performance of biologically sulfidated mZVI remain unclear. Therefore， this study investigated the effects of mZVI particle size and sulfate concentration on the efficiency of TCE removal by biologically sulfidated mZVI with different particle sizes， and explored the underlying mechanisms. The results showed that the mZVI particle size significantly affected the biological sulfidation efficiency and TCE removal rate. 7 μm ZVI exhibited the fastest removal rate （0.16 d^-1） due to its larger specific surface area. However， it was prone to agglomeration and might inhibit microbial growth， leading to the lowest degree of biological sulfidation. In contrast， 40 μm ZVI showed the highest content of reductive sulfur （81.92%） after biological sulfidation， and its reactivity was significantly better than that of the chemically sulfidated group with the same particle size， indicating that biological sulfidation was more effective for larger-sized mZVI. Additionally， sulfate concentration had a significant impact on the dechlorination performance of mZVI. The increase in sulfate concentration created a favorable environment for the growth of sulfate-reducing bacteria， increased the content of reductive sulfur on the mZVI surface， and thus enhanced the dechlorination efficiency of S-mZVI. When the sulfate concentration reached 700 mg/L， S-mZVI could completely remove TCE within 24 days. The dechlorination product results showed that the sulfate concentration was positively correlated with the degree of dechlorination， and high sulfate concentrations promoted the complete removal of chlorine atoms from TCE molecules. The findings can provide theoretical guidance and technical support for the bio-sulfidated mZVI remediation of TCE-contaminated groundwater.
- microscale zero-valent iron /
- microorganism /
- particle size /
- sulfate concentration /
- trichloroethylene

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