摘要
实际SS沉降特性是雨水池、沉淀池设计及优化运行的重要参数。采用累积曲线法测定了上海市典型排水系统雨天出流和地表径流的SS沉降特性。结果表明：地表径流中SS的2 h沉降去除率为58%～88%,且SS沉降去除率随SS初始质量浓度增加呈递增趋势;各类排水系统雨天出流中SS沉降速率和沉降去除率在合流制中相对较大,分流制相对较小,混接的分流制介于前两者之间,SS沉降去除率均在50%以上;合流制中COD的2 h沉降去除率为50%～80%。
Effective settling of suspended solids （SS） is the most important consideration in the design and operation of storm water storage basins. The cumulative curve method was employed in the study of settling properties of several storm water overflow （outflow） and runoff samples of Shanghai urban areas. The results of many 2-hour bench settling tests showed： 1） 58%～88% SS reduction was achieved for the runoff samples and that the SS reduction rate increased with the initial SS concentration, 2） more than 50% SS reduction was achieved for all outflow samples and that the order of settling velocity and SS reduction rate was CSO （combined sewer outflow） 〉cross-connected SSO〉SSO （separate sewer outflow）, and 3） a high degree of COD reduction was observed for the CSO samples （50%～80%）.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第9期668-670,共3页
Environmental Pollution & Control
基金
上海市科委重大项目资助(No.04dz12024)
关键词
SS
沉降速率
雨天出流
地表径流
Suspended solids Settling velocity Drainage discharge Runoff
