Concurrent anaerobic chromate bio-reduction and pentachlorophenol bio-degradation in a synthetic aquifer

文献类型： 外文期刊

第一作者： Shi, Xinyue

作者： Shi, Xinyue;He, Chao;Wang, Ya'nan;Lu, Jianping;Guo, Huaming;Zhang, Baogang;He, Chao

作者机构：

关键词： Chromium; Pentachlorophenol; Microbial evolution; Co-metabolism; Synthetic aquifer

期刊名称：WATER RESEARCH （ 影响因子：13.4； 五年影响因子：13.847 ）

ISSN： 0043-1354

年卷期： 2022 年 216 卷

页码：

收录情况： SCI

摘要： Chromate [Cr(VI)] and pentachlorophenol (PCP) coexist widely in the environment and are highly toxic to public health. However, whether Cr(VI) bio-reduction is accompanied by PCP bio-degradation and how microbial communities can keep long-term stability to mediate these bioprocesses in aquifer remain elusive. Herein, we conducted a 365-day continuous column experiment, during which the concurrent removals of Cr(VI) and PCP were realized under anaerobic condition. This process allowed for complete Cr(VI) bio-reduction and PCP biodegradation at an efficiency of 92.8 +/- 4.2% using ethanol as a co-metabolic substrate. More specifically, Cr (VI) was reduced to insoluble chromium (III) and PCP was efficiently dechlorinated with chloride ion release. Collectively, Acinetobacter and Spirochaeta regulated Cr(VI) bio-reduction heterotrophically, while Pseudomonas mediated not only Cr(VI) bio-reduction but also PCP bio-dechlorination. The bio-dechlorinated products were further mineralized by Azospira and Longilinea. Genes encoding proteins for Cr(VI) bio-reduction (chrA and yieF) and PCP bio-degradation (pceA) were upregulated. Cytochrome c and intracellular nicotinamide adenine dinucleotide were involved in Cr(VI) and PCP detoxification by promoting electron transfer. Taken together, our findings provide a promising bioremediation strategy for concurrent removal of Cr(VI) and PCP in aquifers through bio-stimulation with supplementation of appropriate substrates.

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