水源地生态工程对消毒副产物生成的影响  

The influence of the ecological project in water source area on the production of disinfection by-products

作　　者：何敏 刘连清 龚婷婷 皮佳昌 朱光灿[1,2] HE Min;LIU Lianqing;GONG Tingting;PI Jiachang;ZHU Guangcan(School of Energy and Environment,Southeast University,Nanjing 210096,China;Key Laboratory of Environmental Medicine Engineering of Ministry of Education,Southeast University,Nanjing 210009,China;Jiangsu Suyi Design Group Co.Ltd,Nanjing 210041,China)

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学,环境医学工程教育部重点实验室,南京210009 [3]江苏苏邑设计集团有限公司,南京210041

出　　处：《环境工程学报》2023年第10期3314-3324,共11页Chinese Journal of Environmental Engineering

基　　金：江苏省科技计划面上项目(BK20191147)。

摘　　要：水源地生态工程可改善饮用水水源水质,但其中的水生生物代谢物可能是消毒副产物(DBPs)前体物的来源。本文构建现场实验装置探究了水源地生态工程对原水水质的影响及原水中主要消毒副产物前体物的来源,考察了氯投量、温度以及pH对香蒲根分泌物、菰根分泌物和鲢鱼排泄物氯化后消毒副产物生成的影响。结果表明,实验装置对NH_(4)^(+)-N、TN和TP的平均总去除率分别为74.93%、53.98%和73.02%,总DOC沿程增加。溶解性有机物(DOM)中分子质量分布在<500 Da的DOC含量总体上呈沿程减少的趋势,>3000 Da的DOC沿程有所增加。总三卤甲烷生成势(TTHMFP)和总卤乙酸生成势(THAAFP)沿程呈现增加的趋势,分子质量<3000Da的有机物中TTHMFP和THAAFP沿程有所下降,分子质量>3000 Da的TTHMFP和THAAFP呈沿程增加的趋势。考察了装置中3种水生生物代谢物经氯化后得到的二氯乙酸(DCAA)、三氯乙酸(TCAA)、三氯甲烷(TCM)和二氯乙腈(DCAN)4种消毒副产物生成势,均随着氯投量和温度的增加而升高,主要消毒副产物为TCAA。酸性条件有利于抑制DCAA和TCM的生成,碱性条件有利于抑制TCAA的生成,DCAN的生成量总体上随着pH的升高呈现先上升后下降的趋势。The ecological project in water source area can improve the quality of drinking water sources,but the aquatic metabolites in it may be the source of disinfection by-product(DBPs)precursors.Small-scale experiments were conducted to study the effects of the ecological project in water source area on the water quality and the origin of main DBPs precursors in raw water.The impacts of reaction time,chlorine dosage,temperature,and pH on the production of DBPs after chlorination of cattail root exudates,zizania root exudates,and silver carp excretions were studied.The results showed that the average total removal rates of NH_(4)^(+)-N,TN,and TP were 74.93%,53.98%,and 73.02%by the experiments devices,respectively,and DOC increased along the process.The DOC content for the dissolved organic matter(DOM)with the molecular weight distribution3000 Da DOM increased along the process.The total trihalomethane formation potential(TTHMFP)and total haloacetic acid formation potential(THAAFP)increased along the process.The TTHMFP and THAAFP of organic compounds with a molecular weight less than 3000 Da showed a decreasing trend along the process,while TTHMFP and THAAFP with a molecular weight more than 3000 Da showed an increasing trend along the process.The study also determined the formation potential of four DBPs(DCAA,TCAA,TCM,and DCAN)after chlorination and disinfection of three aquatic biological metabolites.TCAA was found to be the primary DBPs.Their output increased with an increase of chlorine dosage and temperature.Acidic conditions were found to be conducive to inhibiting the formation of DCAA and TCM,while alkaline conditions were conducive to inhibiting the formation of TCAA.Overall,the production of DCAN increased initially and then decreased with pH increasing.

关 键 词：水源地 水生生物代谢物 消毒副产物 

分 类 号：X703[环境科学与工程—环境工程]