Synergistic Effect of Soil Organic Matter and Nanoscale Zero-ValentIron on Biodechlorination

文献类型： 外文期刊

第一作者： Liu, Yangzhi

作者： Liu, Yangzhi;Wang, Yanlong;Wu, Ting;Xu, Jiang;Lin, Daohui;Liu, Yangzhi;Lin, Daohui

作者机构：

关键词： nanoscale zero-valent iron;   soil organic matter;   pentachlorophenol;   electron transport capacity;   indigenous microorganism

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：11.357； 五年影响因子：12.154 ）

ISSN： 0013-936X

年卷期： 2022 年 56 卷 8 期

页码：

收录情况： SCI

摘要： Nanoscale zero-valent iron (nZVI) provides apromising solution for organochlorine (OC)-contaminated soilremediation. However, the interactions among nZVI, soil organicmatter (SOM), and indigenous dechlorinating bacteria are intricate,which may result in unascertained effects on the reductivedegradation of OCs and merits specific investigation. Herein, weisolated an indigenous dehalogenation bacterium (Burkholderiaambifariastrain L3) from a paddy soil and further investigated thebiodechlorination of pentachlorophenol (PCP) with individual anda combination of SOM and nZVI. In comparison with individual-strain L3 treatment, the cotreatment with nZVI or SOM increasedthe removal efficiency of PCP from 34.4 to 44.3-54.2% after 15 daycultivation. More importantly, a synergistic effect of SOM and nZVIwas observed on the PCP removal by strain L3, and the PCP removal efficiency reached up to 75.3-84.5%. Other than thebiodegradation through ortho- and meta-substitution under the individual application of SOM or nZVI, PCP was furtherbiodegraded to 2,4,6-trichlorophenol (TCP) through para-substitution by the isolated bacteria with the cotreatment of SOM andnZVI. The main roles of the nZVI-SOM cotreatment in the biodegradation included the SOM-facilitated microbial proliferation,the nZVI-promoted microbial transformation of SOM, and the induced higher electron transport capacity of redox Fe-PCPbiocycling. Thesefindings provide a novel insight into the action of nZVI in environmental remediations.

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