老旧小区排水管网运行效能定量评估研究

Performance evaluation of sewer network in old residential area

为了探究典型老旧小区排水系统的实际运行效能,并对排水管网改造的效果进行定量分析与评估。基于在线监测、水质采样化验分析等方式对宁波市某老旧小区排水系统的水量水质变化规律进行系统研究,通过分流改造前后效能对比量化评估改造效果,为实际管网改造工作提供数据支撑。流量监测数据和水质分析结果显示,管网分流改造前后晴天平均污水流量从(11.4±1.3)L/s降低为(10.6±0.9)L/s,地下水入渗值由(2.1±0.4)L/s降为(0.6±0.2)L/s,地下水入渗占比从20%减少到6%。管网分流改造后生活污水中各项水质指标提升约20%~30%,降雨事件不再显著影响管网水质。研究表明通过管网分流改造、管网缺陷修复等措施显著改善了管网运输能力和排水水质问题。

In order to investigate the actual operational effectiveness of drainage systems in typic al old neighborhoods,and to quantitatively analyze and evaluate the effect of drainage network renovation.This study is based on online monitoring,water quality sampling and laboratory analysis of an old district drain-age system in Ningbo city,a systematic study of water quantity and quality change patterns,quantitative assessment of the transformation effect through the comparison of the effectiveness before and after the di-version transformation,to provide data support for the actual pipe network transformation work.The flow monitoring data and water quality analysis results show that the average sewage flow in dry weather before and after the pipe network diversion transformation decreased from(11.4±1.3)L/sto(10.6±0.9)L/s.The groundwater infiltration value decreased from(2.1±0.4)L/s to(O.6±0.2)L/s,and the percentage of groundwater infiltration decreased from 20%to 6%,and the per capita sewage discharge increased by a-bout 5%.The water quality indicators in domestic wastewater improved by about 20~30%after the pipe nelwurk diversiun retrofil,aurd rainfall evenls 110 longer siguifiannly affet the water quality of the pipe network.The study showed that the pipe network transport capacity and drainage water quality problems were significantly improved by pipe network diversion and rehabilitation of pipe network defects.