摘要
溶解有机物(DOM)普遍存在于地表水源中,是饮用水消毒副产物的重要前驱物.本研究考察了Fe(Ⅵ)与Mn(Ⅶ)预氧化对浙江东部某水源水中DOM的组成特征及消毒副产物生成势的影响.运用三维荧光光谱(3D-EEMs)分析了两种氧化剂在不同的浓度梯度下对水样进行预氧化后,水样DOM的荧光光谱特性、荧光特征参数和荧光组分等的变化情况,及氯化后消毒副产物(DBPs)的生成情况.结果表明,水源水水样DOM的来源主要为陆源与内源混合且具有一定的腐殖质化程度,Mn(Ⅶ)和Fe(Ⅵ)预氧化不仅对荧光DOM具有较好的降解效果,对腐殖质类DOM也具有一定的降解作用.在DBPs的生成势方面,Mn(Ⅶ)预氧化对三氯甲烷(TCM)生成势的变化呈现出先增强后减弱的现象,对二氯乙腈(DCAN)的生成势具有一定的减弱作用.而Fe(Ⅵ)预氧化对三氯丙酮(1,1,1-TCP)、溴氯乙腈(BCAN)、二溴乙腈(DBAN)和DCAN的生成势均具有明显的降低作用,对二氯一溴甲烷(DCBM)、二溴一氯甲烷(DBCM)和三溴甲烷(TBM)生成势的变化呈现出先增强后减弱的现象.研究结果推动了水源水氧化消毒工艺的发展并为相关研究提供理论指导.
Dissolved organic matter(DOM)is commonly found in surface water sources and is an important precursor of drinking water disinfection by-products.In this study,the effects of Fe(Ⅵ)and Mn(Ⅶ)preoxidation on the compositional characteristics and disinfection by-product generation potential of DOM in a water source in eastern Zhejiang were investigated.Three-dimensional fluorescence spectroscopy(3D-EEMs)was used to analyze the changes of fluorescence spectral characteristics,fluorescence characteristic parameters and fluorescence components of DOM in water samples after pre-oxidation of the two oxidants at different concentration gradients,and the generation of disinfection by-products(DBPs)after chlorination.The results showed that the source of DOM in the water samples was mainly mixed with endogenous sources and had a certain degree of humicification,and the pre-oxidation of Mn(Ⅶ)and Fe(Ⅵ)not only had a good degradation effect on fluorescent DOM,but also had a certain degradation effect on humic DOM.As for the generation potential of DBPs,the changes of Mn(Ⅶ)preoxidation on trichloromethane(TCM)generation potential showed an enhancement and then weakening,and the generation potential of dichloroacetonitrile(DCAN)had a certain weakening effect.The Fe(Ⅵ)pre-oxidation had a significant reduction in the generation potential of trichloroacetone(1,1,1-TCP),bromochloroacetonitrile(BCAN),dibromoacetonitrile(DBAN)and DCAN,and an enhancement and then weakening in the generation potential of dichlorobromomethane(DCBM),dibromochloromethane(DBCM)and tribromomethane(TBM).The results of the study promote the development of oxidative disinfection process for water sources and provide theoretical guidance for related research.
作者
韩港胜
侯嫔
储文斌
王艳
段书乐
强志民
刘丁伟
许谦
蒋菱
蒋才芳
董慧峪
HAN Gangsheng;HOU Pin;CHU Wenbin;WANG Yan;DUAN Shule;QIANG Zhimin;LIU Dingwei;XU Qian;JIANG Ling;JIANG Caifang;DONG Huiyu(School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China;Guangxi Nanning Water Co.Ltd.,Nanning,530031,China;State Key Laboratory of Pollution Control and Resources Reuse,Nanjing University,Nanjing,210023,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第4期1138-1149,共12页
Environmental Chemistry
基金
国家自然科学基金(51878648,52070184,52270012)
国家重点研发计划(2021YFC3200904)
污染控制与资源化研究国家重点实验室开放基金(PCRRF20048)
广西绿城水务股份有限公司技术研发课题资助。
关键词
溶解有机物
三维荧光光谱
预氧化
氯消毒
消毒副产物
dissolved organic matter(DOM)
three-dimensional fluorescence excitation-emission matrix spectroscopy(3D-EEMs)
preoxidation
chlorine disinfection
disinfection by-products(DBPs)
