含炭高密度沉淀池/超滤工艺处理污水厂二级出水

采用含炭高密度沉淀池/超滤组合工艺处理污水厂二级出水,考察了其对常规指标和微量有机污染物的去除效能,并对膜污染特性进行了分析。结果表明,组合工艺对浊度的去除率高达99.9%,出水浊度在0.01 NTU左右;对DOC、UV(254)、TP、氨氮和TN的平均去除率分别为41.02%、49.82%、60.44%、23.34%和10.90%;三维荧光光谱分析表明,组合工艺能有效去除水中的腐殖质和蛋白质类有机物;通过LC-MS/MS检测水中微量有机污染物发现,组合工艺可以使水中的微量有机污染物含量下降66%以上;同时含炭高密度沉淀池预处理能有效减轻膜污染,使跨膜压差增长速度减缓。

Advanced Treatment of Secondary Effluent by Combined Process of Highdensity Sedimentation Tank with Powdered Activated Carbon and Ultrafiltration

The secondary effluent from a wastewater treatment plant was treated by the combined process of high-density sedimentation tank with powdered activated carbon(PAC)and ultrafiltration,the removal effect of conventional water quality index and trace organic pollutants was investigated,and membrane fouling characteristics were analyzed.The results showed that the removal rate of turbidity by the combined process was as high as 99.9%and the effluent turbidity was about 0.01 NTU.The average removal rates of DOC,UV254,TP,NH4+-N and TN were 41.02%,49.82%,60.44%,23.34%and 10.90%,respectively.Fluorescence EEM showed that the combined process could effectively remove humic substances and protein organics in the secondary effluent.The detection results of trace organic pollutants by LC-MS/MS showed that the combined process could reduce the concentration of trace organic pollutants by more than 66%.In addition,the high-density sedimentation tank with PAC could efficiently reduce membrane fouling,so that the growth rate of the trans-membrane pressure was reduced.