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对从地下水中长期去除Cr(VI) 的新见解,使用与硫酸盐减少细菌在位生物硫化零价值铁

Huichao Xu¹, Chuanyu Qin¹, Hui Zhang¹

¹Key Laboratory of Groundwater Resources and Environment of Ministry of Education, College of New Energy and Environment, Jilin University, Changchun, 130021, China; National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin University, Changchun, 130021, China; Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, China.

Journal of environmental management

|March 8, 2024

概括

使用硫酸盐减少细菌 (SRB) 和零价值铁 (ZVI) 的生物硫化为从地下水中去除 (VI) 提供了一种高度有效和可持续的方法. 这种新的方法显著优于传统的化学硫化,显示出增强的反应性和长期性能.

科学领域:

环境科学环境科学
环境工程环境工程
水处理技术水处理技术

背景情况:

零价值铁 (ZVI) 对于Cr (VI) 去除具有反应性,但其效率通常是有限的.
硫化增强ZVI反应性,但使用硫酸盐减少细菌 (SRB) 进行生物硫化研究很少.
现有的化学硫化方法在性能和环境影响方面存在局限性.

研究的目的:

为了评估SRB-生物硫化ZVI (SRB-ZVI) 对于Cr(VI) 去除的性能.
为了将SRB-ZVI与传统的Na2S硫化ZVI系统进行比较.
研究SRB-ZVI系统的长期稳定性和再生机制.

主要方法:

使用SRB进行了ZVI的生物硫化.
测试了SRB-ZVI系统的Cr(VI) 去除,并与Na2S硫化ZVI进行了比较.
进行了FeSx层的表征和SRB生存和再生的评估.

主要成果:

SRB-ZVI形成了一个更厚,更多孔的FeSx层,导致Cr (VI) 去除率比Na2S-ZVI高2.5倍.
SRB-ZVI系统在11个循环中证明了持续的Cr(VI) 清除,而Na2S-ZVI只持续了两个循环.
附在ZVI上的SRB由于结构保护而幸存于Cr(VI) 暴露,使FeSx再生和长期性能成为可能.

结论:

SRB-ZVI提供了一种更强大,更环保,更可持续的替代品,而不是化学硫化,用于Cr6的去除.
SRB和ZVI之间的协同作用促进了高效和持久的地下水整治.
这项研究提出了一个有希望的现场补救策略,利用基于ZVI的技术对地下水污染进行补救.

关键词:

生物硫化生物硫化六价的六价是一种长时间的去除持久的去除减少硫酸盐的细菌可以减少硫酸盐.没有价值的铁.

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