现场生物遗传硫化零价值铁的长期性能和机制,用于增强酸盐降解
Anqi Wang1, Jun Hou1, Lingzhan Miao1
1Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
Bioresource technology
|October 24, 2024
概括
使用硫酸盐减少细菌 (SRB) 生物遗传硫化零价值铁 (BS-ZVI) 显著提高了用于地下水整治的铁反应性. 这种增强的BS-ZVI有效地在长期内去除酸盐.
科学领域:
- 环境科学 环境科学
- 微生物生态学 微生物生态学
- 材料科学 材料科学 材料科学
背景情况:
- 零价值铁 (ZVI) 是有反应性的,但其长期性能和机制需要进一步研究.
- 使用降硫酸盐细菌 (SRB) 的生物遗传硫化 (BS-ZVI) 显示了增强ZVI反应性的潜力.
- 了解BS-ZVI的现场形成和长期影响对于其应用至关重要.
研究的目的:
- 在现场准备BS-ZVI并评估其在地下水整治方面的长期性能.
- 阐明 BS-ZVI. 的增强反应性背后的机制.
- 评估BS-ZVI在酸盐去除中的效率.
主要方法:
- 用海绵铁和SRB构建的柱子用于现场BS-ZVI制备.
- 在140天内监测酸盐 (NO3-) 降解为 (NH4+).
- 分析了ZVI和硫化铁 (FeSx) 的结合.
- 研究的SRB酶活性和代谢副产品.
主要成果:
- 在现场,BS-ZVI实现了超过80%的酸盐减少,明显优于单独的ZVI (40%-60%).
- 硫化铁 (FeSx) 在现场形成并与ZVI结合,改善了电子转移.
- BS-ZVI增强了SRB酶活性,促进了乳酸转化为酸.
- 积累的酸有助于被动化层溶解,提高了酸盐去除效率.
结论:
- 生物遗传硫化有效地提高ZVI的反应性,用于长期的地下水整治.
- 形成FeSx和增强SRB代谢是提高性能的关键机制.
- BS-ZVI为污染的地下水中有效的酸盐去除提供了一个有希望的替代方案.
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