A countermeasure to mitigate combined sewer overflows utilizing storage of runoff water in sewer pipe system

提出了缓解合流制污水溢流的对策：当降雨量较小时，将受污染的径流水全部储存在合流制污水管系统中;在降雨期间和降雨之后，所有储存的水被输送到处理厂，经处理后排放到公共水体中。当在第六和第四级下水管道的下游端，设置控制闸门，将污染径流全部储存在6、5、4、3级排水管中，可储存10 mm雨水量;未经处理而溢出管道系统的受污染径流水有30%至40%可经处理后排入公共水体。

A countermeasure to mitigate combined sewer overflows is proposed: when rain is relatively small, all the polluted runoff water is stored in a combined sewer pipe system; all the stored water is transported into a treatment plant during and after the rain, treated, and drained into public water bodies.When, at the downstream ends of 6th and 4th order sewer pipes, control gates are installed and all the polluted runoff water is stored in the sewer pipes of 6th, 5th, 4th, and 3rd order, then the rain water amount of 10 mm will be able to be stored in the pipes; and 30 or 40 percent of the polluted runoff water that has been overflowed out of the pipe system without any treatment will be able to be treated and drained into public water bodies.