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铁颗粒形成对饮用水分配系统中的转化的影响:对沉积控制的影响

Xinyi Qin¹, Yitian He¹, Xin Huang¹

¹Key Laboratory of Environmental Aquatic Chemistry, State Key Laboratory of Regional Environment and Sustainability, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.

|October 23, 2025

概括

在饮用水中,在管道腐蚀过程中形成的铁氧化物 (FeO_x) 通过将其纳入粒子来稳定 (Al). 这一过程显著减少了可溶性,与预制铁氧化物不同.

科学领域:

环境化学环境化学
水质管理水质管理
材料科学材料科学材料科学

背景情况:

(Al) 是饮用水分配系统 (DWDS) 中常见的污染物.
物种与铁氧化物 (FeO_x) 之间的相互作用,主要来自管道腐蚀,不太清楚.
了解这些相互作用对于保持水质稳定至关重要.

研究的目的:

研究不同氧化铁 (FeO_x) 形成过程和水化学条件下的转化.
阐明DWDS中Al固定和重新调动的机制.
评估有机复合对FeO_x形成和Al稳定性的影响.

主要方法:

在现场与预先形成的FeO_x相比,对Al转换的实验研究.
分析Al物种化和与FeO_x粒子的关联.
操纵水的化学条件 (pH,溶解的有机碳).
使用真实自来水样本进行验证.

主要成果:

现场FeO_x形成显著增强了无机Al转化为稳定的颗粒形式 (可溶性Al减少高达81.8%).
在in-situ形成过程中,无机Al被纳入FeO_x中,通过异构替代到分层双氧化物 (LDH) 结构中.
有机复杂的Al抵抗了转化,并抑制了FeO_x的形成.
酸性条件和升高的pH/DOC促进了从预先形成的FeO_x中提升Al的移动.

结论:

现场FeO_x形成是DWDS中固定无机的关键机制.
与FeO_x结合的稳定性在很大程度上取决于形成过程 (现场与预先形成).
了解Al-FeO_x相互作用可以为控制饮用水系统中积累和释放的策略提供信息.

关键词:

的转化过程中的.饮用水配送系统饮用水配送系统铁氧化物铁氧化物有层的双氧化物.有机物质是有机物质的组成部分.

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