臭氧预氧化对微塑料消毒副产物生成势的影响  

Effect of pre-ozonation on disinfection byproduct formation from microplastics upon subsequent chlorination

作　　者：张显 英浩 刘航 刘蕴思 季斌[1] 刘超[2] ZHANG Xian;YING Hao;LIU Hang;LIU Yunsi;JI Bin;LIU Chao(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085)

机构地区：[1]武汉科技大学城市建设学院,武汉430065 [2]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085

出　　处：《环境科学学报》2023年第10期108-115,共8页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划(No.2022YFC3203702);中国科学院饮用水科学与技术重点实验室自由课题(No.20Z01KLDWST,21Z01KLDWST)。

摘　　要：微塑料在各类水体中频被检出.已有研究表明微塑料与氯反应导致有害消毒副产物(DBPs)的生成.臭氧预氧化是水处理过程中强化有机物去除的重要环节,然而其对微塑料在后续氯化过程中DBPs生成的影响尚不明确.本文研究了臭氧预氧化对聚酰胺、热塑性聚氨酯、聚己二酸/对苯二甲酸丁二醇酯以及聚氯乙烯4种塑料聚合物DBPs生成势的影响.结果表明,臭氧预氧化增强了微塑料与氯的反应活性,显著提高了卤乙酸(如二氯乙酸)和卤乙醛(如三氯乙醛)的生成,最高增加34倍.但是预臭氧化对三卤甲烷和卤乙腈的生成影响较小.进一步分析发现,二氯乙酸和三氯乙醛的前驱物主要来源于臭氧预氧化后的浸出液.此外,微塑料的DBPs生成量随预氧化过程中臭氧浓度的增加而升高.本研究可为水处理过程中微塑料的风险评估提供一定的理论支撑.Microplastics are widely detected in various water bodies.Previous studies revealed that microplastics could serve as the precursors of harmful disinfection byproducts(DBPs)upon chlorination process.Pre-ozonation is an important treatment unit to enhance organic removal in water treatment processes.However,the effect of pre-ozonation on DBP formation from microplastics during subsequent chlorination remains unknown.In this study,the effect of pre-ozonation on DBP formation from chlorination of microplastics(i.e.,polyamide,thermoplastic polyurethane,poly(butyleneadipate-co-terephthalate),and polyvinyl chloride)was investigated.Results showed that pre-ozonation enhanced their chlorine reactivity and formation of haloacetic acids(e.g.,dichloroacetic acid)and haloacetaldehydes(e.g.,trichloroacetaldehyde)with an increase of up to 34-fold.Yet,pre-ozonation posed slight effects on the yields of trihalomethanes and haloacetonitriles.Additional analyses revealed that the precursors of dichloroacetic acid and trichloroacetaldehyde could be mainly ascribed to the leachate.Besides,it was also found that the formation of DBPs increased with increasing ozone concentration.This study provides support for evaluating microplastic-associated risk during water treatment processes.

关 键 词：微塑料 臭氧预氧化 氯化过程 消毒副产物 卤乙酸 

分 类 号：X703[环境科学与工程—环境工程]