Due to the toxicity of bioaccumulative organohalides to human beings and ecosystems,a variety of biotic and abiotic remediation methods have been developed to remove organohalides from contaminated environments.Bioremediation employing organohalide-respiring bacteria (OHRB)-mediated microbial reductive dehalogenation (Bio-RD) represents a cost-effective and environmen-tally friendly approach to attenuate highly-halogenated organohalides,specifically organohalides in soil,sediment and other anoxic environments.Nonetheless,many factors severely restrict the implications of OHRB-based bioremediation,including incomplete dehalogenation,low abundance of OHRB and consequent low dechlorination activity.Recently,the development of in situ chemical oxidation (ISCO) based on sulfate radicals (SO4·-) via the persulfate activation and oxidation (PAO)process has attracted tremendous research interest for the remediation of lowly-halogenated organohalides due to its following advantages,e.g.,complete attenuation,high reactivity and no selectivity to organohalides.Therefore,integration of OHRB-mediated Bio-RD and subsequent PAO(Bio-RD-PAO) may provide a promising solution to the remediation of organohalides.In this review,we first provide an overview of current progress in Bio-RD and PAO and compare their limitations and advantages.We then critically discuss the integration of Bio-RD and PAO (Bio-RD-PAO) for complete attenuation of organohalides and its prospects for future remediation applications.Overall,Bio-RD-PAO opens up opportunities for complete attenuation and consequent effective in situ remediation of persistent organohalide pollution.

Rifeng Wu;Shanquan Wang

Environmental Microbiomics Research Center,School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Sun Yat-sen University,Guangzhou 510006,China

环境科学与工程前沿

[1]Rifeng Wu;Shanquan Wang-.Integration of microbial reductive dehalogenation with persulfate activation and oxidation (Bio-RD-PAO) for complete attenuation of organohalides)[J].环境科学与工程前沿,2022(02):86-107

organohalides,Bioremediation,organohalide,respiring,OHRB

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