沿海地区污水处理厂雨水混入率对设计规模的影响

Influence of rainwater mixing rate on design scale of sewage treatment plant in coastal area

以沿海地区台州某污水处理厂为例,基于三角形法,对雨水混入与污水处理厂水质、水量的响应关系进行分析,探讨雨水混入率对污水处理厂设计规模的影响。结果表明:沿海地区污水处理厂进水水质受降雨影响较大,实际进水水质因雨水混入而小于设计值;沿海地区污水处理厂处理水质效果较差,污染负荷削减率平均值远低于全国平均值;小雨时,沿海地区污水处理厂污染负荷削减率最高,污染负荷削减率随着降雨规模的增大而减小;沿海地区污水处理厂满负荷运行时,污水量处理率较低,为60%~70%;沿海地区污水处理厂实际进水量远大于设计值,水量设计规模宜考虑乘1.4的修正系数。

Taking a sewage treatment plant in Taizhou,a coastal city,as an example,based on the triangle method,the response relationship between rainwater mixing and water quality and quantity of sewage treatment plant was analyzed.The influence of rainwater mixing rate on the design scale of sewage treatment plant was discussed.The results show that the influent water quality of sewage treatment plant in coastal area is greatly affected by rainfall,and the actual influent water quality is less than the design value due to the rainwater mixing.The effect of sewage treatment plants in coastal areas is poor,and the average value of pollution load reduction rate is far lower than the national average value.In case of light rain,the pollution load reduction rate of sewage treatment plant in coastal area is the highest,and the pollution load reduction rate decreases with the increase of rainfall intensity.When the sewage treatment plant in coastal area operates at full load,the treatment rate of sewage volume is relatively low,which is 60%-70%.The actual water inflow of sewage treatment plant in coastal area is far greater than the design value,and the design scale of water volume should be multiplied by 1.4 correction coefficient.