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Simultaneous dissipation of trichloroethene and arsenic from co-contaminated groundwater by coupling biodechlorination and biodetoxification with assistance of biochar

引用

Biochar 2022年第1期4卷 42-55页

作者： Hao Chen Deping Li Ondřej Mašek Ying Zhai Guoqiang Rong Xiaoyun Xu Xinde Cao Ling Zhao School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China. UK Biochar Research Centre School of GeosciencesUniversity of EdinburghEdinburgh EH93JNUK. Baowu Group Environmental Resources Technology Co. Ltd.Shanghai 201999China

Co-contamination of groundwater with trichloroethene(TCE)and arsenic(As)is a widespread problem in industrial *** simultaneous biological removal of As and TCE has not yet been *** study incorporated biochar into anaerobic dechlorination system to achieve a greatly accelerated dissipation and co-removal of TCE and *** eliminated microbial lag(6 days)and achieved a 100%TCE removal within 12 days even at a relatively high initial concentration(TCE:30 mg L^(−1);As(V):4 mg L^(−1)),while without biochar,only 75%TCE was removed until day ***-char adsorbed TCE and the intermediate products allowing them to be degraded on its surface gradually,maintaining a high metabolic activity of *** facilitated the preferential colonization of its surfaces by dechlorinating microorganisms(Clostridium and Dehalococcoides)and suppressed hydrogen-competing microorganisms(Desulfo-vibrio)in *** itself cannot adsorb As,however,separation of biochar carrying the As-laden microorgan-isms achieved 50-70%As-removal from *** biochar-amended incubations were found to be enriched with microbes possessing more crucial As-transforming genes(K00537-arsC and K07755-AS3MT),and upregulated amino acid metabolism,thus enhancing the self-detoxification ability of microorganisms to transform As(Ⅴ)to As(Ⅲ)or volatile organic *** study proposes a strategy of regulating microbes’metabolic activity by biochar to achieve simultaneous removal of coexisting contaminations,which is an important step prior to examining the feasibility of biochar application for enhanced bioremediation.

关键词： Co-contamination complete dechlorination Microbes’self-detoxification As-transforming genes Spatial distribution of microbes

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