S-ZVI@biochar constructs a directed electron transfer channel between dechlorinating bacteria, Shewanella oneidensis MR-1 and trichloroethylene

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL npj Clean Water Pub Date : 2024-08-31 DOI:10.1038/s41545-024-00376-9

Honghong Lyu, Hua Zhong, Zhilian Li, Zhiqiang Wang, Zhineng Wu, Jingchun Tang

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Abstract

The combination of micron zero-valent iron (mZVI) and microorganisms is an effective method for trichloroethylene (TCE) degradation, but electron transfer efficiency needs improvement. A new chem-bio hybrid process using a composite material (S-ZVI@biochar) was developed, consisting of sulfurized mZVI and biochar as a chemical remover, and Shewanella oneidensis MR-1 and dechlorinating bacteria (DB) as a biological agent for TCE degradation. S-ZVI@biochar showed improved stability, biocompatibility, and TCE removal compared to ZVI and S-ZVI. The hybrid system DB + MR-1 + S-ZVI@biochar exhibited the highest TCE removal efficiency at 96.5% after 30 days, which was 3.7 times higher than that of bare ZVI. The study revealed that the enhanced dechlorination performance was due to improved electron transfer efficiency, adjustment of microbial community structure, and iron recycling. S-ZVI@biochar constructed electron transport channels in the composite system, improving the overall dechlorination capacity. This system shows promise for long-term TCE removal in anaerobic environments.

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S-ZVI@biochar 在脱氯细菌 Shewanella oneidensis MR-1 和三氯乙烯之间构建定向电子传递通道

微米零价铁（mZVI）与微生物的结合是降解三氯乙烯（TCE）的有效方法，但电子传递效率有待提高。研究人员利用一种复合材料（S-ZVI@生物炭）开发了一种新的化学-生物混合工艺，该工艺由硫化的 mZVI 和生物炭（作为化学去除剂）以及 Shewanella oneidensis MR-1 和脱氯细菌（DB）（作为降解 TCE 的生物剂）组成。与 ZVI 和 S-ZVI 相比，S-ZVI@生物炭显示出更高的稳定性、生物相容性和 TCE 去除率。30 天后，DB + MR-1 + S-ZVI@biochar 混合系统对 TCE 的去除率最高，达到 96.5%，是裸 ZVI 的 3.7 倍。研究表明，脱氯性能的提高得益于电子传递效率的提高、微生物群落结构的调整以及铁的循环利用。S-ZVI@biochar 在复合系统中构建了电子传输通道，提高了整体脱氯能力。该系统有望在厌氧环境中长期去除三氯乙烷。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.