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对TCE生物降解对H₂和O₂升高的反应:对电动力学增强生物修复的含义

Weiwei Ouyang¹, Yao Huang¹, Cui Li²

¹Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan, Hubei, 430078, PR China.

Environmental research

|February 5, 2024

概括

引入气显著增强了电动增强生物修复 (EK-Bio) 中的三乙烯 (TCE) 降解,通过促进无氧脱剂. 高氧水平抑制了TCE的分解,突出显示了污染水层中需要特定的微生物策略.

科学领域:

环境微生物学环境微生物学
生物修复技术生物修复技术
地质化学地质化学

背景情况:

电动力学增强生物修复 (EK-Bio) 在处理受污染的含水层方面表现有前景.
了解引入的气体 (H2和O2) 的作用及其对微生物群落的影响,对于优化EK-Bio至关重要.
三乙烯 (TCE) 是一种常见的地下水污染物,需要有效的补救策略.

研究的目的:

研究纯 (H2) 和氧 (O2) 对TCE降解的影响.
在EK-Bio.期间分析土著微生物群落的动态变化.
在不同的气体条件下阐明驱动TCE生物修复的机制.

主要方法:

模拟EK-Bio条件,控制溶解 (DH) 和溶解氧 (DO) 度.
16S rRNA基因测序用于微生物社区分析.
功能基因分析 (例如,pceA) 来评估脱潜力.

主要成果:

引入增强了TCE降解,在4周内达到90.4%的去除,总减少131.1μM,产生cis-dichloroethylene (cis-DCE) 作为唯一的副产品.
高DH降低了氧化降解电位 (ORP) 到-500mV,有利于无氧TCE脱.
DH促进了无氧脱剂 (例如,硫,硫) 的丰富,并增加了pceA基因丰度.
由于有氧功能降低,缺乏功能性细菌或竞争性溶解有机碳 (DOC) 消耗,高DO条件抑制了TCE生物修复.

结论:

在EK-Bio.内,是促进TCE在无氧条件下的生物降解的关键因素.
氧气通过干扰微生物活动并可能创造不利条件来抑制TCE生物修复.
优化EK-Bio用于TCE去除需要无氧脱剂或共同代谢基质的战略性输送,特别是在电化学阳极周围.

关键词:

同时发生的网络网络.电动力学增强的生物修复疗法微生物社区的微生物社区.纯气是一种纯气.纯粹的氧气是一种纯粹的氧气.三乙烯是三乙烯的一种.

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