Effects of Oxygenation Resuspension on DOM Composition and Its Role in Reducing Dissolved Manganese in Drinking Water Reservoirs

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摘要

水源沉积物厌氧环境是饮用水系统中锰释放的关键驱动因素。增强沉积物氧化可抑制锰释放，但不同氧化条件下锰的形态转化机制尚不明确。本研究通过实验室模拟，考察了沉积物在不同溶解氧水平（0、2、5、7 mg/L）含氧水层中的暴露情况。结果表明，锰释放量与溶解氧呈显著负相关（R²=0.93，p=0.034），氧气促使溶解性有机物（C2、C3组分）发生反应并形成羟基、羧基等功能基团，通过吸附或络合作用去除锰（C2：R²=0.57，p<0.001；C3：R²=0.53，p<0.001）。对六个水库的实地研究确定了沉积物再悬浮调控锰风险的运行阈值（补偿阈值：17.4 μg/L；风险阈值：中国标准95.5 μg/L；WHO标准70.8 μg/L）。这些发现阐明了锰与有机物的相互作用机制，可为水源系统锰与藻类协同去除提供实践指导。

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@Article{su2025effects,
    title       = {Effects of Oxygenation Resuspension on DOM Composition and Its Role in Reducing Dissolved Manganese in Drinking Water Reservoirs},
    author      = {Ming Su and Weiwei Li and Jiao Fang and Tengxin Cao and Yufan Ai and Changwei Lü and Jinbo Zhao and Ziyi Yang and Min Yang},
    year        = 2025,
    journal     = {Envoronmental Science \& Technology},
    publisher   = {American Chemical Society},
    pages       = 1-12,
    url         = {http://dx.doi.org/10.1021/acs.est.5c00235},
    doi         = {10.1021/acs.est.5c00235}
}