城镇污水系统中外水排查方法研究

Study on Investigation Methods of Outer Water in Urban Sewage System

目前,中国城镇污水系统一直面临着排水管网建设不完善,污水进厂浓度过低等问题。通过提出一种基于水质检测和水质水量分析的外水排查方法,并将其应用于工程中发现:在旱天条件下,根据本研究提出的外水排查方法开展外水排查工作,仅需排查约1/5的排水小区,便能够取得了预期效果,共发现了外水量约5.42万m^(3)/d;若采取相应工程措施剥离外水后可以避免污水处理厂超负荷运行,同时使旱季污水处理厂一期进厂BOD_(5)浓度达到103.39 mg/L,二期进厂BOD5浓度达到115.63 mg/L。结果表明:该外水排查方法能够高效、快捷的排查污水系统中大部分外水,可为我国污水系统提质增效中外水剥离提供借鉴。

China’s urban sewage system has been facing problems such as imperfect drainage pipe network and low concentration of sewage entering the plant. By proposing an outer water investigation method based on water quality testing and water quality and quantity analysis, and applying it to practice. It is found that under the condition of dry weather, based on the outer water investigation method proposed in this study, only about 1/5 of the drainage area needed to be inspected to achieve the expected investigation effect, and a total of about 54,200 m^(3)/d of outer water volume is discovered;If corresponding engineering measures are taken to strip the outer water, the overload operation of the sewage treatment plant can be avoided, and the BOD_(5) concentration of the first phase of the sewage treatment plant in dry season can reach 103.39 mg/L, and the BOD5concentration of the second phase of the plant can reach 115.63 mg/L. The results show that the outer water investigation method can efficiently and quickly discover most of the outer water in the sewage system, which can provide reference for the strip of outer water in China’s sewage system.