垃圾渗滤液、粪便污水与城市污水同步脱氮除碳小试

A minor try at simultaneous denitrification and decarbonization from landfill leachate,fecal sewage and urban sewage

采用倒置A2/O工艺同步处理渗滤液、粪便污水与城市污水脱氮除碳.结果表明:水力停留时间是最显著影响因素,延长水力停留时间是提高混合污水除污效果的最为简捷有效手段;当垃圾渗滤液、粪便污水和城市污水混合比为0.2∶1∶400、水温为22～30℃、泥龄为20d时,最优运行参数为HRT=11h、DO=3mg/L、R=80%、r=200%,此时COD、NH3—N和TN平均去除率分别为88.6%、98.4%和62.1%,出水浓度均可达到国家一级A标准,同时得到粪便污水可做为外加碳源,适量的添加到城市污水中,提高生化处理效率.

Inverted A2/O process was used to denitride and decarbonize simultaneously from landfill leachate,fecal sewage and urban sewage.The result showed that the foremost factor was the most significant one,so that its extension would be the most simple and effective means for improving the mixing of sewage decontamination effect.When the landfill leachate,fecal sewage and urban sewage mixing ratio was 0.2∶1∶400,water temperature was 22~30 ℃ and sludge age was 20 days,the optimum operating parameters would be as follows： the HRT = 11 h,DO=3 mg/L,R=80%,r=200%.Then COD,NH3—N and TN removal rate would be 88.6%,98.4% and 62.1%.The effluent water concentration could steadily achieve the standards of Grade A standards.After the optimization of the decontamination process,the problem of low denitrification rate occurred after the combined treatment was effectively resolved,so that the simultaneous treatment of landfill leachate,fecal sewage and urban sewage as well as its simultaneous achievement of standards would be possible.Meantime,the study also showed that fecal sewage could be used as carbon source and its appropriate amount could be added to the urban sewage treatment system to improve the efficiency of biochemical treatment.