在低透性土壤中通过电动力学增强的生物修复技术进行三乙烯排毒:长期可行性和时空模式
Si-Ying Yang1, Chun-Yu Lai1, He-Ping Zhao2
1MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China.
Journal of hazardous materials
|December 5, 2024
概括
电动力学增强生物修复 (EK-BIO) 显示出清理三乙烯 (TCE) 污染的粘土土的前景. 长期研究表明,二次注射和有氧途径对于持续的TCE降解至关重要.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 受三乙烯 (TCE) 污染的低透性土壤在现场整治是困难的,因为质量转移和生物可用性差.
- 电动力学增强生物修复 (EK-BIO) 结合了电动力学和生物修复,以改善挑战性土壤类型中的污染物去除.
研究的目的:
- 调查EK-BIO对三乙烯 (TCE) 污染的低透性土壤的长期性能.
- 了解空间和时间脱模式以及长时间运行期间微生物群体的动态.
- 评估电极反应和潜在的有氧途径对无氧脱的影响.
主要方法:
- 为了模拟现场条件,五个一维柱子被运行了不同的时间 (28至138天).
- 随着时间的推移,对三乙烯 (TCE) 降解和脱产品进行了监测.
- 进行了微生物社区分析,包括检测Dehalococcoides,以及基因表达分析 (tceA,vcrA,Dhc16S).
主要成果:
- 实现了持续的TCE降解,观察到46.52%的TCE恢复.
- 长时间的电动力学操作增强了最初的脱化步骤 (TCE 到 DCE).
- 虽然Dehalococcoides存在,但氧气暴露造成了损伤,表明需要进行二次注射. 有氧细菌 (Comamonas,Pseudomonas) 建议使用其他有氧途径. 基因表达证实了随着时间的推移,后来的脱化步骤的下降.
结论:
- 该EK-BIO系统展示了TCE污染的低透性土壤持续整治的潜力.
- 二次注射和开发替代有氧途径对于长期生物降解的有效性至关重要.
- 研究结果支持将EK-BIO用于挑战性污染场地的现场整治的可行性.
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