与PVC管道相比,腐蚀的铁管抑制了微生物介导的Mn2氧化和MnO积累
Guiwei Li1, Qi Chen2, Haibo Wang1
1Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Water research
|January 21, 2024
概括
溶解氧 (DO) 对于饮用水管道中的氧化至关重要. 新的PVC管道促进了微生物氧化,而腐蚀的铁管由于低DO水平而显示出有限的氧化.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 水处理 处理水的方法
背景情况:
- 饮用水配送管道中的氧化 (MnOx) 沉积会导致变色等审美问题.
- 管道材料对氧化和MnOx积累的影响尚不清楚.
研究的目的:
- 为了研究微生物介导的Mn2氧化和MnOx沉积物在不同的管道材料中的形成.
- 为了确定管道材料和溶解氧 (DO) 对转化的影响.
主要方法:
- 使用腐蚀的钢和新的聚乙烯 (PVC) 管道进行了为期300天的管道循环实验.
- 监测 (II) 度,溶解氧 (DO) 和微生物群落.
- 在铁管中进行受控的通风实验.
主要成果:
- 在带有生物膜和足够的DO (>8.0 mg/L) 的PVC管道中,在48小时内发生了完整的Mn(II) 氧化.
- 在低DO (<6.5 mg/L) 的铁管中,二氧化是有限的,早期去除是由于铁腐蚀产品的吸附.
- 在铁管中将DO增加到8.0 mg/L,导致完全的Mn2氧化.
结论:
- 管道材料显著影响微生物的Mn2氧化和MnO在饮用水系统中的积累.
- 溶解氧是控制分布管道中微生物氧化的关键因素.
- 保持适当的DO水平对于防止与有关的水质问题至关重要.
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