管网异常(水质浓度低)排查技术路线和案例分析

Technical Route and Case Analysis of Drainage Network Abnormity Investigation for Low Water Quality Concentration

针对提质增效行动中污水管网排查体量大、投资费用高、耗时长等问题,分析了目前污水管网排查主要方法的优缺点,选取以水质对比法为核心进行管网排查。南京市某污水收集系统排查项目,采用便携式氨氮检测仪对污水管网重要检查井水质进行检测分析,逐步缩小项目排查范围后,再利用清疏检测进行辅助排查,快速有效找到低浓度问题后做到即查即改,整改完成后再进行闭环水质检测,验证整改成效。结果表明,水质检测是提质增效行动中的重要环节,在缩小排查范围和确定问题点位中作用显著;快速水质检测手段(如便携式氨氮仪)在污水管网排查项目中既经济又快捷,具有推广意义。

Aiming at the problems of large workload,high investment cost,and long time consumption in the quality and efficiency improvement action of drainage network investigation,the pros and cons of the main methods are analyzed,and the water quality comparison method is selected as the core for drainage network investigation.The portable ammonia nitrogen instrument was used to detect and analyze the water quality of key inspection wells in a drainage network of Nanjing and gradually narrow the project inspection scope before using the dredging test for auxiliary inspection.The low concentration problem was rectified right after found out quickly and effectively,and closed-loop water quality detection was conducted after the rectification is completed to verify the effectiveness.The results show that water quality testing is an important link in the action of quality and efficiency improvement,and plays a significant role in narrowing the scope of investigation and determining the location of the problem.Rapid water quality detection methods(such as portable ammonia nitrogen instruments)are economical and quick in drainage network investigation projects,and have promotion significance.