合流污水系统最优截流倍数研究  

Study on optimal interception ratio of combined sewerage system

作　　者：郑岩杭 李翠梅[1] 黄瑜琪 ZHENG Yanhang;LI Cuimei;HUANG Yuqi(School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215000, Jiangsu, China;Guiyang Architectural Design & Surveying Prospecting Co., Ltd, Guiyang 550000, Guizhou, China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215000 [2]贵阳建筑勘察设计有限公司,贵州贵阳550000

出　　处：《水利水电技术》2020年第10期173-179,共7页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51109153);2017苏州市水利科技项目(2017003)。

摘　　要：在合流污水系统的改造过程中,截流倍数(n0)的选取直接关系到改造项目的经济与环境效益。为了实现雨污分流改造的最优化,本研究以合流污水系统为研究对象,通过建立合理有效的合流污水系统的SWMM模型,构建了以“工程费用与环境污染损失最小”为目标函数的最优截流倍数模型。通过模拟分析不同截流倍数(n0)下合流污水对受纳水体水环境的影响及系统改造费用的变化,确定改造项目环境与经济效益最优化的截流倍数。研究结果表明:合流污水系统改造的最优截流倍数为n0=3。此时,年总费用取得最小值180.78万元,截流式合流制系统年溢流总量减少28.95%,年截流总量增加15.51%,年总溢流污染负荷TSS、COD、TN、TP分别减少18.17%、21.25%、14.72%、17.49%,年总截流对应污染负荷分别增加18.38%、19.31%、18.67%、15.18%,实现了合流污水系统改造的最优化。During the reconstruction of the combined sewerage system,the selection of the interception ratio(n0)is directly related to both the economic and the environmental benefits of the project to be reconstructed.In order to realize the optimization of the reconstruction of rainwater-sewage separation,the combined sewerage system is taken as the study object,for which an optimal interception ratio model with the objective function of“the minimum project cost and environmental pollution loss”is established through building up a reasonable and effective SWMM model for the combined sewerage system.Through the simulative analysis made on the influence from the combined sewerage on the water environment of the receiving water body and the change of the system reconstruction cost under the conditions of different interception ratios(n0),the interception ratio for optimizing both the environmental and economic and benefits of the reconstruction project is determined.The study result shows that the optimal interception ratio for the reconstruction of the sewerage system is n0=3.At this time,the minimum value of 1.8078 million yuan is obtained for the total annual cost,while the annual total overflow of the intercepting combined system is reduced by 28.95%,the annual total interception is increased by 15.51%,the annual total overflow pollution loads of TSS,COD,TN,TP are decreased by 18.17%,21.25%,14.72%,17.49%respectively and the annual total interceptions corresponding to the pollution loads are increased by 18.38%,19.31%,18.67%,15.18%respectively as well.In this way,the optimization of the reformation of the combined sewerage system is realized.

关 键 词：合流污水系统 SWMM模型 最优化 截流倍数 

分 类 号：TU992[建筑科学—市政工程]