102;  102);  line-height: 150%;  font-family: tahoma;  arial;  helvetica;  sans-serif;  font-size: 12px;  pipe network problem" style="text-decoration-line: none; color: rgb(48, 89, 220);">"> pipe network problem; drainage system; wastewater treatment facility; water environment treatment; wastewater discharge

随着城市化、工业化速度的加快，我国城市污水排放量逐年增长，污水处理设施规模逐年增大，但城市水环境治理依然存在问题。通过分析2002年—2016年我国城市污水处理设施的发展与现状，发现我国污水处理设施的基础建设已经基本完成，污水排放量与末端处理设施能力的矛盾已得到缓解且污水处理设施留有余量，污水处理设施的建设由阶梯式的快速增长模式转变为随着城市人口变化与城市建设而变化的可持续发展模式。而城市水环境污染治理的主要 方向已经转变为解决管网 问题与水环境治理现状之间的矛盾，管网规模不足、混接问题严重、地下水入渗、合流制溢流、调蓄建设不足是未来排水系统应该解决的主要问题。

With the acceleration of urbanization and industrialization, the discharge of municipal wastewater and the scale of wastewater treatment facilities in China have been increasing year by year.However, there are still problems in urban water environment management. By analyzing the development and current situation of municipal wastewater treatment facilities in China from 2002 to 2016, the infrastructure of wastewater treatment facilities have been basically completed, the contradiction between the end treatment infrastructure capacity and wastewater dischange has been alleviated, and the wastewater treatment facilities have left the remaining treatment capacity, so the construction of wastewater treatment facilities has changed from a stepped rapid growth model to a sustainable development model dominated by urban population change and urban construction. At the present stage, the main direction of urban water environmental pollution treatment has been transformed into solving the contradiction between the problems of pipe network and the current situation of water environment treatment. Insufficient length of pipe network, serious problem of misconnection of pipe network, infiltration of groundwater in pipe network, overflow of combined flow and construction of storage facilities are the main problems, which should be solved in future drainage system.