台州市生活污水处理厂设计水量中雨水混入比例研究

基于台州市椒江区2014年污水处理厂进水量和雨量监测站的数据,进行污水处理厂日进水量频率分析和城镇污水管网中雨水混入比例分析,从而对污水处理厂设计水量进行修正。结果表明:小雨、中雨、大雨、连续暴雨时的污水量分别是晴天污水量的1.29、1.53、1.77、2.31倍;地下水与河水渗入量约占晴天日均污水量的24.1%,雨天雨水混入量约占雨天日均污水量的24.2%;随着降雨量增大,雨水混入比例由10%升高至35%,最后趋于27%;滨海城市生活污水处理厂设计水量中雨水混入比例可定为25%~30%。

Study of rainwater mixing rate of design water quantity at domestic sewage treatment plants in Taizhou City

Based on the data of inflow of a sewage plant and data from rainfall monitoring stations in the Jiaojiang District, in Taizhou City in 2014, we analyzed the daily inflow frequency at the sewage plant and the rainwater mixing rate in urban sewage pipe networks, so as to modify the design water quantity of the sewage plant. The results are as follows: the sewage quantities in the cases of light, moderate, heavy, and continuously heavy rainfall were respectively 1. 29, 1. 53, 1. 77, and 2. 31 times those on sunny days. The quantity of groundwater mixed in sewage accounted for 24. 1% of the daily sewage quantity on sunny days, and the quantity of rainwater mixed in sewage accounted for 24. 2% of the daily sewage quantity on rainy days. With the increase of rainfall, the rainwater mixing rate increased from 10% to 35%, and finally tended to be 27%. The rainwater mixing rate of the design water quantity for sewage plants in coastal cities can be determined as a value ranging from 25% to 30%.