生物膜在地下水过器中的反应性MnOx涂层过砂上加速氧化
Roos Goedhart1, Emiel Kruisdijk1, Doris van Halem1
1Water Management Department, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands.
ACS ES&T water
|December 18, 2025
概括
在氧化过器中,化 (As-(III)) 到酸 (As-(V)) 的生物氧化比表面催化氧化要快得多. 这种生物途径加速了的去除,为安全的饮用水处理提供了新的策略.
科学领域:
- 环境科学 环境科学
- 水处理 处理水的方法
- 微生物学 微生物学
背景情况:
- 从地下水中去除 (As) 对安全饮用水至关重要.
- 化物 (As-(III)) 氧化为化物 (As-(V)) 提高了过器中去除效率.
- 氧化物 (MnOx) 在过器中使用,但主要的As-(III) 氧化途径 (表面催化与生物) 尚不清楚.
研究的目的:
- 在MnOx涂层过砂上区分表面催化和生物As-(III) 氧化.
- 在实验室尺度过器中研究As-(III) 氧化的主要路径和动力学.
- 评估微生物群落在去除中的作用.
主要方法:
- 运行实验室尺度过器与含有As-(III) 的水,使用全尺度过器中的MnOx涂层沙子.
- 在3周内监测了As-(III) 氧化率和释放.
- 利用微生物抑制测试和16S rRNA基因测序来识别微生物角色和社区变化.
主要成果:
- 观察到3周内从表面催化转向生物氧化.
- 与表面催化氧化 (CHEM = 0.318 分钟) 相比,生物氧化表现出 14 倍的加速 (k BIO = 4.64 分钟-1).
- 确定了A-氧化细菌的增加,特别是*Polaromonas* (Comamonadaceae),并通过抑制证实了生物活性.
结论:
- 微生物对As-(III) 的生物氧化在MnOx过器上的表面催化氧化中占主导地位.
- 微生物活动显著提高了去除的速度,超过了MnOx的内在氧化能力.
- 这项研究强调生物途径是开发先进去除技术的关键目标.
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