Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 400, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123298
Keywords
Hexachlorocyclohexanes; Nanoscale zerovalent iron particles; Soil microbial communities; Dechlorination
Categories
Funding
- Key Program for International S&T Cooperation Projects of China (Ontario-China Research and Innovation Fund) [2016YFE0101900]
- National Natural Science Foundation of China [41771269, 41721001]
- China Agriculture Research System [CARS-04]
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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 Non-amendment 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 Mossbauer 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.
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