二级出水DOM自活化过硫酸盐的效能

田宝嘉; 白雪; 韩雨佳; 金鹏康

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (8) : 4333-4340.

水污染与控制

二级出水DOM自活化过硫酸盐的效能

田宝嘉, 白雪, 韩雨佳, 金鹏康

作者信息 +

The efficiency of peroxymonosulfate self-activation by dissolved organic matter in secondary effluent

TIAN Bao-jia, BAI Xue, HAN Yu-jia, JIN Peng-kang

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摘要

基于二级出水中溶解性有机物(DOM)的光敏化特性,利用太阳辐照构建了实际二级出水DOM自活化过硫酸盐反应体系.分别研究了不同过硫酸盐类型､初始pH值以及共存无机阴离子对过硫酸盐分解率的影响,解析了反应前后DOM的理化特性与结构变化.结果表明,二级出水各分级组分可有效活化过一硫酸盐(PMS),其中亲水性物质(HI)的活化效果最佳,在pH值为7时,PMS分解率可达26.7%.分解过程中产生的活性氧化物质作用于DOM,使其芳香结构逐步被破坏､分子量减小,所含类腐殖酸等荧光物质强度显著降低,木质素､脂质､单宁酸等化合物占比发生明显变化,表明二级出水DOM通过有效活化过硫酸盐实现了自降解.二级出水DOM中的类腐殖酸和木质素作为主要电子供体,受太阳光激发后将光生电子传递至PMS使其活化,从而引发DOM自降解过程.本研究构建的实际二级出水DOM自催化体系无需外加催化剂,避免了高能量消耗与二次污染.

Abstract

The persulfate-based advanced oxidation process demonstrates significant advantages in the removal of refractory organic pollutants. However, traditional activation methods are associated with high energy consumption and the potential generation of secondary pollution, which restricts the widespread application of this technology. Based on the photosensitive properties of dissolved organic matter (DOM) in secondary effluent, a practical self-activation peroxymonosulfate (PMS) reaction system using solar radiation was established. Systematic investigations were conducted on the effects of different persulfate types, initial pH conditions, and common inorganic anions on PMS decomposition efficiency, accompanied by comprehensive characterization of physicochemical properties and structural transformations in DOM before and after the reaction. The results indicated that the all fractions of secondary effluent could effectively activate PMS, with the hydrophilic (HI) fraction exhibiting the most efficient activation, achieving a PMS decomposition rate of up to 26.7% under neutral conditions. During the decomposition process, reactive oxidative species generated from PMS interacted with DOM, leading to the gradual degradation of its aromatic structures and a reduction in molecular weight. The intensity of fluorescent substances, such as humic-like compounds, significantly decreased, while the proportions of lignin, lipids, tannins, and other compounds had notable changes. These observations indicated that the DOM in secondary effluent achieved self-degradation through effective activation of PMS. Humic-like compounds and lignin in secondary effluent DOM served as the primary electron donors. Upon excitation by sunlight, they transferred photogenerated electrons to PMS, thereby activating it and triggering the self-degradation of DOM. The self-catalytic system of using the DOM in actual secondary effluent in this study without the need for external catalysts, avoiding high energy consumption and secondary pollution.

导出引用

田宝嘉, 白雪, 韩雨佳, 金鹏康. 二级出水DOM自活化过硫酸盐的效能[J]. 中国环境科学. 2025, 45(8): 4333-4340

TIAN Bao-jia, BAI Xue, HAN Yu-jia, JIN Peng-kang. The efficiency of peroxymonosulfate self-activation by dissolved organic matter in secondary effluent[J]. China Environmental Science. 2025, 45(8): 4333-4340

中图分类号： X703.1

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