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浙江大学何艳教授团队采用纳米零价铁（nZVI）与本地微生物的降解作用联合修复被六氯环己烷异构体高度污染的土壤。相关成果发表于Journal of Hazardous Materials（IF=9.038）。
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Abstract
Hexachlorocyclohexane (HCH) isomers pose potential threats to the environment and to public health due to their persistence and high toxicity. In this study, nanoscale zero-valent iron (nZVI) coupled with microbial degradation by indigenous microorganisms with and without biostimulation was employed to remediate soils highly polluted with HCH. The degradation efficiency of total HCHs in both the “nZVI-only” and “Nonamendment” treatments was approximately 50 %, while in the treatment amended with nZVI and acetate, 85 % of total HCHs was removed. Addition of nZVI and acetate resulted in enrichment of anaerobic microorganisms. The results of quantitative PCR (qPCR) and 16S rRNA gene amplicon sequencing revealed that Desulfotomaculum, Dehalobacter,Geobacter, and Desulfuromonas likely contributed to the depletion of HCH isomers. Moreover, some abiotic factors also favored this removal process, including pH, and the generation of iron sulfides as revealed by the result of Mssbauer spectrometer analysis. Our research provides an improved remediation strategy for soils polluted with HCH isomers and an understanding of the synergistic effect of nZVI and indigenous microorganisms.
六氯环己烷（HCH）异构体由于其持久性和高毒性而对环境和公共健康构成潜在威胁。本研究采用纳米零价铁（nZVI）与本地微生物的降解作用联合修复被HCH异构体高度污染的土壤。在“仅添加nZVI”处理和“无添加”处理中，总HCH的降解效率均约为50％，而添加nZVI和乙酸盐的处理中，总HCH的去除率为85％。nZVI和乙酸盐的添加导致厌氧微生物的富集。定量PCR（qPCR）和16S rRNA基因扩增子测序的结果表明，Desulfotomaculum、Dehalobacter、Geobacter和Desulfuromonas可能导致了HCH异构体的去除。此外，一些非生物因素也有利于该去除过程，包括pH值和铁硫化物的生成。本研究为被HCH异构体污染的土壤提供了一种改良的修复策略，并明晰了nZVI和本地微生物的协同效应。
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