环境工程学报2026，Vol.20Issue(3)：719-728,10.DOI:10.12030/j.cjee.202507064
污水管网内污染物去除动力学分析及模拟
Dynamics analysis and simulation of sewage degradation in sewer network
摘要
Abstract
This study investigated the removal characteristics of key pollutants in sewer networks and their impact on the influent carbon-to-nitrogen(C/N,calculated as COD/TN)of the wastewater treatment plants(WWTPs).The distribution of the C/N in source wastewater was characterized by sampling at sewage discharge outlets.Using an adjustable sewer network research and validation system at the Kunshan Water Environment Treatment Research Base,pollutants removal over 144 h was monitored under high-and low-velocity conditions(0.491 m·s-1 and 0.089 m·s-1,respectively).COD and total nitrogen(TN)removals were fitted using pseudo-first-order kinetics.Combined with user discharge water-quality data,C/N variations within the sewer network were simulated.The results indicated that the effluent C/N was dependent upon the user type and discharge time.Pilot-scale experiments demonstrated that removal rates for COD(including SCOD and PCOD),five-day biochemical oxygen demand(BOD5),and suspended solids(SS)over 144 h were all approximately 80%,with higher removal observed under low-flow conditions.In contrast,the system exhibited an inferior removal efficiency for TN,NH3-N and TP in general.Kinetic fitting results demonstrated that the COD removal rate constant exceeded that of TN,and both decreasing at higher flow velocity(kCOD=0.016 7 h-1,KTN=0.002 9 h-1 at low velocity;kCOD=0.012 7 h-1,KTN=0.002 0 h-1 at high velocity).Simulations based on the average mass concentration of actual source pollutants indicated that the time required for the C/N to decline to the denitrification threshold(4.50)was 12.24 h under high velocity and shortened to 9.49 h at low velocity.These findings showed that a higher flow velocity effectively retarded the decline of the C/N.Therefore,regulating the sewer flow to shorten the hydraulic retention time of wastewater is crucial for maintaining a suitable C/N in the terminal sewage and ensuring the denitrification efficiency at WWTPs.关键词
污水管网/污染物去除/伪一级动力学/C/NKey words
sewer network/sewage removal/pseudo-first-order kinetics/carbon-to-nitrogen ratio分类
资源环境引用本文复制引用
冯若丹,李翠梅,朱春伟,周莉芬,左树,张坚..污水管网内污染物去除动力学分析及模拟[J].环境工程学报,2026,20(3):719-728,10.基金项目
苏州市水利水务科技项目(2023002) （2023002）
