东莞市长安镇雨污分流改造的设计与思考

Design and Thinking of Rainwater and Sewage Diversion Transformation in Chang’an Town, Dongguan City

磨碟河是东莞市构建生态网络布局及发展生态城市的重要节点,其水质污染、水生态系统破坏等问题比较严重,开展磨碟河系统治理工作已经刻不容缓。分析了长安镇磨碟河流域排水体制现状,提出了进行雨污分流改造的治理思路与解决方案:首先是梳理系统,改造错混接,全面切断雨水、地表水等外水进入污水系统的通道;其次是完善市政管网,提高污水管网覆盖率;之后进行现有管段的清淤及修复,保障管网畅通;在市政道路上形成清晰的雨污两套系统后,开展地块内的雨污分流改造及排口整治,对难改造的合流地块及排口进行小总口截流。目前该工程施工已完成90%,建设范围内形成了清晰的雨污分流系统,排口溯源工作初步完成,相关污水厂的进水BOD5浓度稳定达到180 mg/L以上。

Modie River is an important node for Dongguan to construct ecological network and develop ecological city. Its water quality pollution and water ecosystem destruction are relatively serious.Therefore, it is urgent to remedy the Modie River system. The present situation of the drainage system of Modie River basin in Chang’an Town was analyzed, and the treatment ideas and solutions of rainwater and sewage diversion transformation were proposed. First, the system was inspected completely, the wrong and mixed connection was transformed, and the channel for rainwater, surface water and other external water to enter the sewage system was completely cut off. Second, the municipal pipe network was improved, and the coverage of sewage pipe network was increased. Third, existing pipe sections were dredged and repaired to ensure the unobstructed flow of the pipe network. Finally, after the formation of separate rain and sewage systems on municipal roads, rainwater and sewage diversion transformation and drainage outlet remediation were carried out, and small total drainage outlet for interception was set for combined areas and drainage outlets were difficult to transform. At present, 90% of the construction of the project has been completed, and a complete rainwater and sewage diversion system has been formed within the construction area. The traceability of discharge outlet has been preliminarily completed, and BOD5in influent of relevant sewage plants is always above 180 mg/L.