合流制排水系统雨季污染物溢流的截流与调蓄控制研究

Interception and storage control of overflow pollutant of combined intercepting sewer system during rainfall

截流式合流制排水系统是我国主要的排水体制之一。以昆明市主城区明通河合流制排水系统为背景,研究了雨季产污及迁移规律及削减入湖污染物的措施,并进行了工程示范。示范研究结果表明,在CODCr截留率小于80%、截流倍数n0=1-3、调蓄量2-20 mm（以不透水地面计）,提高截流倍数或调蓄量均可显著提高污染物截留率。截流倍数与调蓄量可表述为截留系数的函数,截流倍数增加1等效于调蓄量增加8 mm,截留系数为CODCr截留比率的幂函数。

Combined intercepting sewer systems are popular in China.Based on Mingtong River combined intercepting sewer system of main town in Kunming City,the pollutant quantity and migration principles in rain season and the measures to reduce the wastes flowing into lake were studied,and the demonstration project was also conducted.Results showed that while CODCr interception rate was below 80%,interception ratio was 1-3 and storage capacity was 2-20 mm（on the basis of impermeable ground）,improving interception ratio and storage capacity could apparently increase the interception rate of combined intercepting sewer systems.The interception ratio and storage capacity can be stated as function of interception coefficient.As for this specified object,improving 1 unit of interception ratio was equivalent to improving storage capacity by 8 mm,and interception coefficient was a power function of CODCr interception rate.