零价铁渗透反应屏障去除六价铬的新见解:硫酸盐还原菌在下游原位生成的 FeS 反应区的功能

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Journal of Hazardous Materials Pub Date : 2024-10-24 DOI:10.1016/j.jhazmat.2024.136282
Huichao Xu, Liming Ren, Chuanyu Qin, Hui Zhang, Xiaoyu Li, Yongsheng Zhao
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引用次数: 0

摘要

零价铁渗透反应屏障(ZVI-PRB)下游的生物地球化学行为在污染地下水的修复中发挥着巨大的积极作用,但长期以来却完全被忽视。因此,本研究进行了为期 240 天的 SRB 增强 ZVI-PRB 柱实验,重点研究 ZVI-PRB 下游到底发生了什么。结果表明,SRB 在 ZVI-PRB 内的生物硫化作用将 ZVI-PRB 完全去除六价铬的寿命从 38 天延长到至少 240 天。更重要的是,与以往侧重于提高 ZVI-PRB 本身性能的研究不同,本研究在 ZVI-PRB 下游发现了一个原位生成的 FeS 还原反应区。当 ZVI-PRB 失效时,下游反应区仍能继续发挥去除六价铬的作用。反应区含水层介质对六价铬的最大去除能力达到 155.1 mg/kg,是商用 ZVI 去除能力的 39.7%。进一步证实,还原区主要是 FeS 而不是 FeS2。ZVI-PRB 内部和下游发生的生物地球化学作用导致了 FeS 的形成。基因测序显示,ZVI-PRB 下游的 SRB 丰度明显高于 ZVI-PRB 内部。对下游 FeS 反应区的了解为利用 ZVI-PRB 进行更有效的修复提供了新的见解。
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New insights on zero-valent iron permeable reactive barrier for Cr(VI) removal: The function of FeS reaction zone downstream in-situ generated by sulfate-reducing bacteria
The biogeochemical behavior downstream of the zero-valent iron permeable reactive barrier (ZVI-PRB) plays an enormous positive role in the remediation of contaminated-groundwater, but has been completely neglected for a long time. Therefore, this study conducted a 240-day SRB-enhanced ZVI-PRB column experiment, focusing on what exactly happens downstream of ZVI-PRB. Results show that biosulfidation of SRB inside ZVI-PRB prolonged the complete Cr(VI) removal longevity of ZVI-PRB from 38 days to at least 240 days. More importantly, unlike previous studies that focused on improving the performance of ZVI-PRB itself, this study found an in-situ generated FeS reduction reaction zone downstream of the ZVI-PRB. When the ZVI-PRB fails, the downstream reaction zone can continue to play a role in Cr(VI) removal. The maximum Cr(VI) removal capacity of the aquifer media from the reaction zone reached 155.1 mg/kg, which was 39.7% of commercial ZVI capacity. The reduction zone was further confirmed to be predominantly FeS rather than FeS2. Biogeochemistry occurring within and downstream of ZVI-PRB leads to the formation of FeS. Gene sequencing revealed significantly higher SRB abundance downstream of ZVI-PRB than within the ZVI-PRB. The understanding of the downstream FeS reaction zone provides new insights for more effective remediation using ZVI-PRB.
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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