不同入流掺混条件下河水对污水管网污染物衰减影响研究  

Impact of River Water on Pollutant Attenuation in Sewer Networks under Varied Inflow Mixing Conditions

作　　者：李劢 张维 孙永利 刘龙志 马换梅 吴宝利 顾淼 李家驹 LI Mai;ZHANG Wei;SUN Yongli;LIU Longzhi;MA Huanmei;WU Baoli;GU Miao;LI Jiaju(North China Municipal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300074,China;National Engineering Technology Research Center for Water&Wastewater,Tianjin 300074,China;Yangtze Ecology and Environment Co.,Ltd.,Wuhan 430014,China)

机构地区：[1]中国市政工程华北设计研究总院有限公司,天津300074 [2]国家城市给水排水工程技术研究中心,天津300074 [3]长江生态环保集团有限公司,武汉430014

出　　处：《给水排水》2025年第2期140-145,共6页Water & Wastewater Engineering

摘　　要：通过模拟试验装置,将河水入流量占污水总量的比例分别设置为0、30%、60%,研究了不同入流掺混条件下河水对污水管网中污染物衰减规律,结果表明:①河水具有较高的DO及氧化性物质时,会明显改变污水的氧化还原环境,加剧污水中有机污染物的降解。②当河水入流量由30%提升至60%,管网污染物质中BOD_(5)衰减最为明显,由3.75%提升至31.36%。其他各指标的衰减规律如下:COD衰减率由4.26%提升至17.32%、TN衰减率由5.36%提升至14.72%、NH_(3)-N由1.47%提升至5.40%、PO_(4)^(3-)由7.19%提升至12.94%。③河水入流量为60%条件下,各污染物质净衰减速率具体表现为:BOD_(5)>COD>PO_(4)^(3-)>TN>氨氮>TP。④河水入流瞬时带来的稀释主要取决于河水入流量、初始浓度、密度差等参数条件,是管网污水与河水混合体系浓度的平均。In this paper,through the simulation test device,the proportion of river inflow to the total sewage is set as 0,30%and 60%,respectively.The attenuation law of pollution substances in the sewage network under different river inflow conditions is studied,and the following conclusions are obtained:①When the river water has high DO and oxidizing substances,it will significantly change the redox environment of sewage in the pipe network and aggravate the degradation of organic pollutants in sewage.②When the river inflow rate increases from 30%to 60%,BOD_(5) attenuation in the pipe network is the most obvious,increasing from 3.75%to 31.36%.The attenuation rules of other indicators are as follows:COD attenuation rate increases from 4.26%to 17.32%,TN attenuation rate increases from 5.36%to 14.72%,NH_(3)-N from 1.47%to 5.40%,PO_(4)^(3-)-from 7.19%to 12.94%.③Under the condition of 60% river inflow,the net attenuation rate of each pollutant is as follows:BOD_(5)>COD>PO_(4)^(3-)>TN>ammonia nitrogen>TP.④The instantaneous dilution caused by the inflow of river water mainly depends on the inflow of river water,initial concentration,density difference and other parameter conditions.It is the average concentration of the mixed system of sewage and river water in the pipe network.

关 键 词：河水入流 污水管网 衰减率 氧化还原环境 

分 类 号：TU992[建筑科学—市政工程]