城市更新背景下老旧小区排水改造技术研究

Research on Drainage Reconstruction Technology for Old Residential Areas under Background of Urban Renewal

摘要:

针对老旧小区改造中排水能力提升和面源污染控制两大改造难点，以上海市某老旧小区改造项目为例，提出了一种“量质双控”的改造方案。采用以“源头减排”为核心的综合性改造策略。在雨污分流上，对无法单独纳管的混流点选用以雨水为判别依据的雨污分流技术；在排水能力提升上，通过“边进边出、缓释控流排放”工艺及设施，滞蓄峰值径流，实现雨水径流峰值削减；在污染控制上，通过控制污染严重的初期径流，实现面源污染的削减。项目实施后，在6月27日和7月18日降雨情况下，排口处外排峰值流量削减率分别为68.46%和58.53%，同步有效解决改造前征询确认的强降雨易诱发小区积水隐患。

Abstract:

Aiming at the two major challenges in the reconstruction of old residential areas, such as enhancing drainage capacity and controlling non-point source pollution, taking a reconstruction project of an old residential area in Shanghai as an example, a “quantity and quality dual control” reconstruction scheme is proposed. A comprehensive reconstruction strategy centered on “source reduction” is adopted. For the separation of rainwater and sewage, a rainwater-based rainwater and sewage separation technology is selected for mixed flow points that cannot be separately connected to the pipe network. To enhance drainage capacity, the “inlet-outlet simultaneous operation, slow-release and flow-controlled discharge” process and facilities are used to detain and store peak runoff, realizing the reduction of rainwater runoff peak. In terms of pollution control, the reduction of non-point source pollution is achieved by controlling the initial runoff with severe pollution. After the implementation of the project, under the rainfall events on June 27th and July 18th, the reduction rates of the external discharge peak flow at the outlet were 68.46% and 58.53% respectively, simultaneously and effectively addressing the potential hazard of waterlogging in the residential area confirmed through consultation before the reconstruction due to heavy rainfall.