雨水系统运行回归设计状态是城市雨天污染控制的关键

The return to design status of stormwater system operation is the key to pollution control in urban rainy days

雨天排水污染是影响当前城市水环境质量提升的限制性因素,雨水系统运行回归设计状态是城市雨天污染控制的关键。围绕雨天排水污染控制这一难题,从雨水系统设计状态涵义、雨水系统如何回归设计状态及回归设计状态过程中的关键控制举措三方面展开论述。遵循现行国家标准设计的完全分流制雨水系统,按照设计状态运行可以有效实现入河污染控制;污染动态溯源排查整治让雨水和污水“各行其道”、强化城市排水管渠检测修复保障运行水位可从技术手段上使雨水系统回归设计状态,长效管理和智能运维是雨水系统保持设计状态的关键;同步提出雨水系统回归设计状态过程中可采取基于雨水口截污源头减排、合流制区域排水户雨天污水排放管控等措施。

Rainy drainage pollution is a limiting factor affecting the current improvement of urban water environment quality,and the return of stormwater system operation to the design status is the key to controlling urban rainy pollution.This article discusses the problem of controlling drainage pollution in rainy days from three aspects:the meaning of stormwater system design status,how to return the stormwater system to the design status,and the key control measures in the process of returning to the design status.A fully separated stormwater system designed according to current national standards can effectively achieve river pollution control by operating according to the design status;The dynamic traceability investigation and remediation of pollution can make rainwater and sewage'go their separate ways',strengthen the detection and repair of urban drainage pipes and channels to ensure the operation water level,and make the stormwater system return to the design status from the technical means,and long term management and intelligent operation and maintenance are are the key to maintain the design status of the stormwater system;During the process of synchronously proposing the return design status of the stormwater system,measures such as reducing emissions based on the interception source of the rainwater inlet and controlling the discharge of sewage from the combined drainage area during rainy days can be taken.