市政污水二级出水中溶解性有机质在紫外/氯处理过程中的转化特性  

Transformation Characteristics of Dissolved Organic Matter During UV/Chlorine Treatment of Municipal Secondary Effluent

作　　者：王雪凝 张炳亮 潘丙才[1,2] WANG Xue-ning;ZHANG Bing-liang;PAN Bing-cai(State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Nanjing University,Nanjing 210023,China;Research Center for Environmental Nanotechnology(ReCENT),Nanjing University,Nanjing 210023,China)

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,南京210023 [2]南京大学环境纳米技术研究中心,南京210023

出　　处：《环境科学》2021年第8期3847-3857,共11页Environmental Science

基　　金：国家自然科学基金项目(21925602)。

摘　　要：紫外/氯高级氧化技术是一种新型的水处理技术,可有效氧化去除多类有机污染物,但目前较为缺乏紫外/氯处理真实污水过程中溶解性出水有机质(dEfOM)转化特性的研究.采用紫外光谱、荧光光谱和傅里叶变换离子回旋共振质谱(FT-ICRMS)探究了两个市政污水二级出水中dEfOM在紫外/氯处理过程中的转化特性,同时对该过程中形成的氯代副产物(Cl-BPs)进行了分析.结果表明,紫外/氯可以有效去除d Ef OM中的芳香族化合物和荧光物质,且大部分物质只是发生了化学转化而非矿化,其中主要荧光组分蛋白质最先发生反应;部分CHOS类物质发生降解并生成CHO类物质,该过程优先去除大分子不饱和及还原性物质,并生成小分子饱和及氧化性物质.此外,紫外/氯处理使得三卤甲烷和卤乙酸的产生量明显增加,处理后的两个二级出水中分别检测出255种和133种Cl-BPs.利用分子质量差异分析共鉴别出了12对基于亲电取代和43对基于加成反应的前体物-反应产物对.本研究可为紫外/氯技术的实际水处理应用提供基础信息参考.As an emerging advanced oxidation technology,UV/chlorine treatment is capable of effectively oxidizing various organic pollutants.Till now,the transformation of dissolved effluent organic matter(dEfOM) in real wastewater during UV/chlorine treatment remains unclear.In this study,ultraviolet and fluorescence spectroscopy were combined with Fourier transform ion cyclotron resonance mass spectrometry to probe the transformation of dEfOM in two municipal secondary effluents during UV/chlorine treatment.Meanwhile,the newly formed chlorinated byproducts(Cl-BPs) are particularly concerned.Generally,aromatic compounds and fluorescent components could be readily removed after UV/chlorine treatment,and most of the d Ef OM underwent transformation rather than mineralization.Protein-like components,which accounted for the largest proportion of fluorescent components,were subject to a preferential reaction.UV/chlorine treatment could result in the degradation of CHOS compounds and the formation of CHO compounds.During this process,unsaturated and reduced compounds of large molecules were preferentially removed,whereas saturated and oxidized compounds with low molecular weight were produced.Moreover,the concentrations of trihalomethanes and haloacetic acids increased substantially after UV/chlorine treatment.In total,255 and 133 Cl-BPs were detected in the respective effluents after UV/chlorine treatment.In addition,12 and 43 possible precursor-Cl-BPs pairs were identified,respectively,based on electrophilic substitution and addition reactions by means of mass difference analysis.This study is expected to provide fundamental information for practical application of the UV/chlorine treatment process.

关 键 词：溶解性出水有机质(dEfOM) 紫外/氯 傅里叶变换离子回旋共振质谱(FT-ICR-MS) 光谱 氯代副产物 

分 类 号：X703[环境科学与工程—环境工程]