污水厂尾水对受纳水体中消毒副产物(DBPs)时空分布特征的影响  

The spatial and temporal dynamics of disinfection by-products(DBPs)in receiving influenced by wastewater treatment plant effluent

作　　者：刘菲 李翀 聂中林 黄适尔 徐赫姝 吴涵 陈亚松 张驰 齐维晓 LIU Fei;LI Chong;NIE Zhonglin;HUANG Shier;XU Heshu;WU Han;CHEN Yasong;ZHANG Chi;QI Weixiao(Yangtze River Ecological Environmental Research Center,China Three Gorges Corporation,Beijing 100038;Center for Water and Ecology,School of Environment,Tsinghua University,Beijing 100084;School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004)

机构地区：[1]中国长江三峡集团长江生态环境工程研究中心,北京100038 [2]清华大学环境学院,清华大学水质与水生态研究中心,北京100084 [3]桂林理工大学环境科学与工程学院,桂林541004

出　　处：《环境科学学报》2024年第3期105-116,共12页Acta Scientiae Circumstantiae

基　　金：中国长江三峡集团有限公司科研项目(No.WWKY-2020-0507)。

摘　　要：以保障污水厂尾水补水安全为目的,通过分析长江中下游城镇污水厂尾水及受纳水体的水质、溶解性有机质与消毒副产物(DBPs)的时空分布特征,评估污水厂尾水DBPs对受纳水体的生态风险.结果表明,污水厂尾水中溶解性有机碳(DOC)含量低,排入受纳水体后下游较上游断面DOC含量有所下降;空间上总氮(TN)浓度沿程呈先上升后下降趋势,季节上冬季>夏季>春季.4种三卤甲烷(THM)与4种卤乙腈(HANs)的浓度范围分别为0.16~26.46μg·L^(-1)与0.007~14.08μg·L^(-1),随着受纳水体的输移呈先升高后降低的趋势;冬季THMs浓度高于夏季与春季,春季HANs浓度高于冬季与夏季.夏季的C/N-DBPs对受纳水体基本无生态风险,冬季与春季时三氯甲烷(TCM)与二氯乙腈(DCAN)为高风险物质,需重点关注.本文对长江中下游典型污水厂尾水排入受纳水体的迁移过程进行系统研究,为该地区污水中DBPs的风险控制提供了重要科学依据.To guarantee the environmental safety of reused water and explore its influence on the receiving river,the impact of wastewater treatment plant(WWTP)effluent on the spatial and temporal distribution characteristics of the water quality,dissolved organic matter,and disinfection byproducts(DBPs)in the middle and lower reaches of the Yangtze River were investigated.Further,the ecological risk of DBPs were assessed in the receiving river.The results showed that the dissolved organic carbon(DOC)concentrations in the effluent was lower than those in the receiving rivers.The concentrations of total nitrogen(TN)increased firstly upon the effluents discharging into the river,followed by a decrease at a distance of 500 m away from the outlet,with TN concentrations ranking as winter>summer>spring across the seasons.The total concentrations of trihalomethane(THMs)and haloacetonitrile(HANs)ranged from 0.16 to 26.46μg·L^(-1),and 0.007 to 14.08μg·L^(-1),,respectively.With the water flowing in the receiving river,THMs concentration increased initially and then decreased downstream,with higher winter concengrations compared to summer and spring,while the concentration of HANs peaked in spring.Ecological risk assessment results showed that C/N-DBPs in summer posed no significant risk to the receiving river.However,trichloromethane(TCM)and dichloroacetonitrile(DCAN)in winter and spring were considered medium or high-risk substances necessitating attention.This comprehensive evaluation sheds light on the transport dynamics of DBPs from WWTP effluents to receiving rivers in the Yangtze River,providing valuable insights for mitigating DBPs risks in these aquatic ecosystems.

关 键 词：污水厂尾水 受纳水体 消毒副产物 生态风险 

分 类 号：TU991.2[建筑科学—市政工程]