进水氨氮负荷对污水处理中硝化作用的影响

摘要

In wastewater treatment,high ammonia nitrogen wastewater treatment is one of the most difficult problems.Even some researchers found that high ammonia nitrogen containing wastewater treatment process also caused the release of greenhouse gas nitrous oxide (N2O).Therefore,by the method of gradually increasing influent ammonia nitrogen concentration,nitrification bacteria had been domesticated for efficient treatment of high ammonia nitrogen wastewater.The study found that the influent ammonia nitrogen concentration was increased,so that dissolved oxygen (DO) for activated sludge had a lower concentration.Thus,ammonia-oxidizing bacteria (AOB) had a lower activity,which led to the release of N2O.For the high influent loading of ammonia nitrogen and low DO concentration,aerobic denitrification occurred for AOB,releasing greenhouse gas N2O.Therefore,during gradually increasing the influent loading of ammonia nitrogen,it was recommended to maintain a certain concentration of DO for the active sludge,avoiding to cause the release of greenhouse gases N2O for nitrosification.%污水处理中,高氨氮的污水处理一直是污水处理中比较难解决的问题之一.甚至一些研究学者发现,高氨氮废水处理过程中还会引起温室效应气体氧化亚氮(N2O)释放.因此,本研究采用逐步提高进水氨氮浓度的方法,驯化具有高效处理高氨氮废水的硝化菌群.研究发现,进水氨氮浓度提高使得活性污泥中溶解氧(DO)浓度降低,进而氨氧化菌(AOB)活性较低,同时导致N2O气体的释放.在进水高氨氮负荷和低DO浓度条件下,AOB发生好氧反硝化反应,产生温室气体N2O.因此,建议逐步提高进水氨氮负荷的同时,需要保证活性污泥保持一定浓度的DO,避免导致亚硝化过程中温室气体N2O的释放.