基于监测评估的北方丘陵城市污水提质增效研究

Research on the Quality and Efficiency Improvement of Municipal Wastewater Treatment in Northern Hilly City Based on Monitoring and Evaluation

以黄河流域某丘陵城市为例,针对其污水系统收集效能不足的现状,构建了以水量核算法和水质参数对比法为技术支撑的监测评估体系,定量分析外水侵入风险。监测评估结果表明,研究区内源头生活污水BOD5为350.0~750.0 mg/L,总体较高;雨季入渗污水系统的雨水不足旱季污水量的4%;局部沿河敷设的污水系统中河水、地下水等外水入侵率超过了60%。基于评估结果,提出了适合北方干旱区山地丘陵城市的污水提质增效主要手段,包括“修管网、治错接、改干管”等技术对策,可为其他城市污水系统提质增效提供参考。

Taking the mountainous and hilly city in the Yellow River basin as an example,in view of the current situation of insufficient collection efficiency of sewage systems,a monitoring and evaluation system based on the water quantity accounting method and the water quality parameter comparison method is constructed to quantitatively analyze the intrusion risk of external water.The monitoring evaluation results show that the BOD5 concentrations of the source domestic sewage in the study area range from 350.0 to 750.0 mg/L,which are generally high.The rainfall infiltrated into the sewage system is less than 4%of the sewage in the dry season.The intrusion rate of external water such as river water and ground water in the sewage system laid along the river exceeds 60%.Based on the analysis results,the main means including technical countermeasures such as pipeline modification,pipeline reconstruction and the main pipe system improved,are put forward for the mountainous and hilly cities in the northern arid region,which can provide references for the quality and efficiency improvement of other urban sewage systems.