首页|长距离调水水源中溶解性有机物特征及消毒副产物生成势的变化解析

长距离调水水源中溶解性有机物特征及消毒副产物生成势的变化解析

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水体中溶解性有机物(dissolved organic matter,DOM)是消毒副产物的重要前体物,本研究考察了季节变化对长距离输水干渠中DOM特征及消毒副产物生成势(disinfection by-products formation potential,DBPsFP)的影响.发现类芳香蛋白和类富里酸是主要荧光类物质,而夏季类可溶性微生物产物组分的比例显著上升,且自生源指标表明夏季样本具有更强的内源特性.体积排阻色谱耦合有机碳检测器(high-performance size exclusion chromatography coupled with an organic carbon detector,HPSEC-OCD)分析显示输水过程中水质稳定,腐殖质(humic substances,HS)组分在总有机碳中所占比例超过60％,而分子质量大于20 kDa的生物大分子聚合体(biopolymers,BP)在夏季有所增加.不同季节DOM的氯反应活性也不同,夏季反应性更强,导致更高的DBPsFP.夏季温度升高,间接促进浮游生物繁殖和微生物活动,进而改变了 DOM的组成结构和反应性.此外,由于HPSEC-OCD几乎可以表征所有类型的有机碳,因此它所表征的组分与DBPsFP的相关性更好,其中三卤甲烷生成势与BP组分呈高度正相关,卤乙酸生成势则与HS组分关联更紧密.了解DOM的时空变化特征及其与DBPsFP的相互关系,将有助于更好地优化水处理方法以获得更稳定的水质.
Characteristics of dissolved organic matter in the long-distance water diversion source and analysis of changes in disinfection by-products formation potential
Dissolved organic matter(DOM)in water bodies serves as a crucial precursor for the formation of disinfection by-products(DBPs).This study investigates the impact of seasonal changes on the characteristics of dissolved organic matter(DOM)and the formation potential of disinfection by-products(DBPsFP)in the trunk canal of the long-distance water transfer.It was found that aromatic protein-like and fulvic acid-like substances are the predominant fluorescent materials,with a significant increase in the proportion of soluble microbial product-like components in the summer,and the biogenic index indicates stronger endogenous characteristics in the summer samples.Analysis using High-Performance Size Exclusion Chromatography coupled with an Organic Carbon Detector(HPSEC-OCD)shows that water quality is stable during the transfer process,with humic substances(HS)accounting for over 60％of the total organic carbon,and an increase in biopolymers(BP)with molecular weights greater than 20 kDa during the summer.The chlorination reactivity of DOM varies with the season,being higher in the summer,which leads to the increased total DBPsFP.The rise in temperature during summer indirectly promotes the proliferation of plankton and microbial activity,thereby altering the composition and reactivity of DOM.Moreover,since HPSEC-OCD can characterize nearly all types of organic carbon,the components it represents correlate better with DBPsFP.Specifically,the formation potential of trihalomethanes shows a high positive correlation with BP components,while the formation potential haloacetic acids is more closely related to HS components.Understanding the spatiotemporal characteristics of DOM and its relationship with DBPsFP will aid in optimizing water treatment methods to achieve more stable water quality.

dissolved organic matterdisinfection by-products formation potentialthree-dimensional fluorescencematrixfluorescence regional integrationhigh performance size exclusion chromatography

付蔚、梁建奎、吴胜念、李珏纯、季闻翔、董慧峪、于建伟、张洪刚、张颖、苗钦奎、强志民

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南开大学环境科学与工程学院,天津 300350

中国科学院生态环境研究中心,饮用水科学与技术重点实验室,北京 100085

中国南水北调集团中线有限公司,北京 100083

溶解有机物 消毒副产物生成势 三维荧光光谱 荧光区域积分 高效体积排阻色谱

国家重点研发计划国家重点研发计划国家自然科学基金项目国家自然科学基金项目

2021YFC32009042022YFC32037055207018452270012

2024

10.12030/j.cjee.202402011

环境工程学报
中国科学院生态环境研究中心

环境工程学报

CSTPCD北大核心
影响因子：0.804
ISSN：1673-9108
年,卷(期)：2024.18(6)
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