【摘要】 以服务面积为45~1 041 hm2的城市区域为研究对象,考察了不同雨量下城市排水系统的COD截留、调蓄控制效果。结果表明,降雨时径流中的COD浓度可超过同期的旱流污水,因而任何排水体制若不控制面源污染,均会对水环境造成严重污染,其中以不控制溢流污染的合流制问题更为突出。对于截流式合流制排水系统,同时增大截流倍数和调蓄量可有效提高雨期的COD污染物截留量(约60%~80%),达到或高于传统分流制排水系统。更多还原

【Abstract】 COD overflow,interception,detention and retention of urban sewerage with a service area of 45 to 1 041 hm2 were investigated under different rainfalls.The results show that COD in rainfall runoff may exceed that in dry weather wastewater.So any drainage system that does not control non-point source pollution would pollute the water environment severely,especially combined system that does not control overflow.The intercepting rate of COD in intercepting-type combined system can be increased to 60% to 80% during rainfall by improving interception ratio,detention and retention capacity,which is higher than that in traditional separate system.更多还原