不同降雨规模对城镇污水处理厂进水水质水量影响分析  

Analysis of the impact of different rainfall scales on the water quality and quantity of municipal wastewater treatment plants

作　　者：王凯 刘广兵[1] 岳强[1] 李秋红 WANG Kai;LIU Guangbing;YUE Qiang;LI Qiuhong(Jiangsu Provincial Academy of Environmental Science,State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River,Nanjing 210036,China)

机构地区：[1]江苏省环境科学研究院国家环境保护长江中下游水生态健康重点实验室,南京210036

出　　处：《给水排水》2024年第8期57-63,共7页Water & Wastewater Engineering

基　　金：江苏省省属公益类科研院所自主科研经费资助项目(GYYS2002103,GYYS2023106)。

摘　　要：以江苏省中部某城镇污水处理厂2021年进水数据为依据,利用夏波洛-威尔克(S-W)检验法、三角形法等方法,分析城镇污水处理厂进水水质分布;结合2021年降雨量数据,研究不同降雨规模下污水处理厂可生化性、雨水混入比例及生活污水收集率变化,以期为优化污水处理厂雨天运行管理提供数据和科学支撑。结果表明:污水处理厂进水COD服从正态分布,氨氮、总氮和总磷呈正偏态分布;随着降雨规模的增大,雨水混入率由11.1%提高至19.7%,污水处理厂设计规模宜考虑乘以1.2的安全系数;中雨时,污水处理厂进水水质处于较好状态的天数占比最高,大雨时可生化性最差;降雨量越大,生活污水收集率越低,汛期(6-8月)生活污水收集率比枯水期(12月-次年2月)降低20个百分点,应强化汛期6-8月生活污水的收集处理,降低生活污染物排放。Based on the influent data of a municipal wastewater treatment plant in central Jiangsu Province in 2021,the distribution of influent quality of municipal wastewater treatment plant was analyzed by using the methods of Shapolo-Wilke(S-W)test and triangle method.Combined with the rainfall data in 2021,the changes of biodegradability,rainwater mixing ratio and domestic sewage collection rate of sewage treatment plants under different rainfall scales were studied in order to provide data and scientific support for optimizing the operation and management of sewage treatment plants in rainy days.The results show that the influent COD of the sewage plant obeys the normal distribution,and the ammonia nitrogen,total nitrogen and total phosphorus are positively skewed.With the increase of rainfall scale,the rainwater mixing rate increased from 11.1%to 19.7%,and the design scale of sewage treatment plant should be multiplied by a safety factor of 1.2.During moderate rain,the number of days in which the influent water quality of the sewage treatment plant is in good condition accounts for the highest proportion,and the biodegradability is the worst during heavy rain;the greater the rainfall is,the lower the collection rate of domestic sewage is.The collection rate of domestic sewage in flood season(June-August)is 20 percentage points lower than that in dry season(December-February).The collection and treatment of domestic sewage in June-August in flood season should be strengthened to reduce the discharge of domestic pollutants.

关 键 词：雨水混入率 可生化性 污水处理厂设计规模 生活污水收集率 

分 类 号：TU992[建筑科学—市政工程]