污水厂低浓度进水问题分析

Analysis of Low Concentration Inflow in Wastewater Treatment Plants

随着《城镇污水处理提质增效三年行动方案(2019~2021)年》的印发,全国各地积极开展提质增效工作。工程实施后,部分城市污水处理厂进水浓度偏低的问题改善有限,成为提质增效的痛点。基于完成市政排水管网改造工程的情况,对某污水处理厂进水CODCr浓度仍不足100 mg/L的污水分区进行成效评估排查,通过水质水量平衡计算,分析出该新建区存在规划与现状不匹配、非生活用水占比高、雨污混接情况复杂等问题,得出通过工程手段难以彻底解决污水厂低浓度进水问题的结论。为该区域后续提质增效工作提出优化排水结构、强调建管结合、加强排水管理及合理制定提质增效目标的建议。

With the issuance of the Three Year Action Plan for Improving the Quality&Efficiency of Urban Sewage Treatment(2019~2021),various parts of the country are actively carrying out quality and efficiency improvement work.After the implementation of the project,the problem of low influent concentration in some urban sewage treatment plants has been limited in improvement,becoming a pain point for improving quality and efficiency.Based on the completion of the municipal drainage network renovation project,an effectiveness evaluation and investigation were conducted on the sewage zoning of a certain sewage treatment plant where the influent CODCr concentration was still less than 100 mg/L.Through water quality and quantity balance calculation,it was analyzed that there were problems in the new construction area,such as mismatch between planning and current situation,high proportion of non-domestic water,and complex situation of rainwater and sewage mixing.The conclusion was drawn that it is difficult to completely solve the low concentration influent problem of the sewage plant through engineering means.Provide suggestions for optimizing the drainage structure,emphasizing the integration of construction and management,strengthening drainage management,and reasonably setting quality and efficiency improvement goals for the subsequent work in the region.