降雨对污水处理厂进水污染物浓度的影响

以上海市某污水处理厂为例,系统研究了降雨对污水厂进水pH值、COD、NH+4-N、TP和TN等污染物浓度的影响.结果表明,在污水处理厂接收到雨水的24 h内,进水中COD、NH+4-N、TP和TN的浓度均升高,并在不同时段出现峰值,说明进水污染物的浓度在短时间内受降雨的影响较大.对比全年雨天和旱天的差异情况,COD、N...

Effect of Rainfall on Influent Pollutants Concentration of Wastewater Treatment Plant

Taking a certain wastewater treatment plant in Shanghai as an example,the effects of rainfall on wastewater treatment plant’s influent pollutants such as pH,COD,NH₄⁺-N,TP and TN were studied.The results indicated that,during the 24 h after the rain water was received by the wastewater treatment plant,the influent pollutants’concentration all increased and show peaks at different time periods,which proved that the concentrations of influent pollutants were largely affected by rainfall in a short period of time.By comparing the annual pollutants’loads between rainy days and dry days,little difference was shown for the mass loads of COD,ammonia nitrogen and total nitrogen.While the total phosphorus showed higher mass loads in rainy days compared to dry days,the TN/TP,however,showed litter difference.This indicated that the high mass load of total phosphorus has no serious effects on the wastewater treatment process during rainy days.