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

IF 10.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

环境科学与技术 Pub Date : 2025-05-19 DOI:10.1021/acs.est.5c00235

Ming Su,Weiwei Li,Jiao Fang,Tengxin Cao,Yufan Ai,Changwei Lü,Jinbo Zhao,Ziyi Yang,Min Yang

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Abstract

Anaerobic conditions in source water sediments are a key driver of manganese (Mn) release in drinking water systems. Enhancing sediment oxidation can inhibit Mn release, but the mechanisms of Mn speciation under varying oxidative conditions remain unclear. This study examined sediment exposure to oxygenated water layers at controlled dissolved oxygen levels (0, 2, 5, 7 mg L-1) through laboratory simulations. Results showed Mn release is negatively correlated with DO (R2 = 0.93, p = 0.034), with oxygen driving reactions between dissolved organic matter (C2 and C3 components) and forming functional groups (-OH, -COOH) that remove Mn through adsorption or complexation (C2: R2 = 0.57, p < 0.001; C3: R2 = 0.53, p < 0.001). Field studies in six reservoirs identified operational thresholds for sediment resuspension to mitigate Mn risks (compensation threshold: 17.4 μg L-1; risk threshold: China: 95.5 μg L-1; WHO: 70.8 μg L-1). These findings clarify Mn-organic matter interactions and can provide practical guidance for Mn and algae removal in source water systems.

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氧合再悬浮对饮用水中DOM组成的影响及其对溶解锰的还原作用

源水沉积物中的厌氧条件是饮用水系统中锰（Mn）释放的关键驱动因素。增强沉积物氧化可以抑制Mn的释放，但不同氧化条件下Mn形成的机制尚不清楚。本研究通过实验室模拟研究了沉积物在受控溶解氧水平（0,2,5,7 mg L-1）下暴露于含氧水层的情况。结果表明，Mn释放量与DO呈负相关（R2 = 0.93, p = 0.034），氧驱动溶解有机物（C2和C3组分）之间的反应，形成官能团（-OH, -COOH），通过吸附或络合去除Mn (C2: R2 = 0.57, p < 0.001；C3: R2 = 0.53, p < 0.001)。通过对6个水库的实地研究，确定了沉积物再悬浮降低锰风险的操作阈值(补偿阈值：17.4 μg L-1；风险阈值：中国：95.5 μg -1；WHO: 70.8 μg L-1)。这些发现阐明了锰与有机物的相互作用，并可为原水系统中锰和藻类的去除提供实用指导。

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来源期刊

环境科学与技术环境科学-工程：环境

CiteScore

17.50

自引率

9.60%

发文量

12359

审稿时长

2.8 months

期刊介绍： Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.