【摘要】 饮用水水源地氨氮污染问题日益突出,低温期对氨氮的去除更是饮用水生产中的重大难题。目前去除氨氮最有效的方法是生物预处理工艺,但存在低温期处理效率低的问题,因此构建了以悬浮填料和沸石组合的曝气生物滤池。研究表明,悬浮填料-沸石曝气生物滤池通过悬浮填料、沸石生物降解和吸附的协同作用,在处理低温期源水时,对氨氮的去除效能较高。在低温期(3~10℃),BAF对氨氮的平均去除率为75.73%,亚硝酸盐氮没有积累;温度降低时,悬浮填料的去除效果下降,但沸石对去除氨氮的贡献增大。根据好氧硝化作用原理对氮的物料平衡进行计算,发现低温期部分氨氮是被沸石吸附。进一步对沸石的吸附性能进行研究,发现生物沸石对氨氮仍具有较高的吸附性能。更多还原

【Abstract】 Ammonia nitrogen pollution of drinking water source has become increasingly prominent,and the removal of ammonia nitrogen at low temperature stage is a major problem in drinking water production. At present,the most effective method for removing ammonia nitrogen is biological pretreatment process,but it has low efficiency at low temperature stage. Therefore,a biological aerated filter(BAF) with suspended media and zeolite was constructed. The operation results showed that ammonia nitrogen could be effectively removed from source water by the synergetic effect of degradation and adsorption by suspended media and zeolite at low temperature stage. The average removal rate of ammonia nitrogen by the BAF was 75. 73%,and no accumulation of nitrite happened at 3 to 10 ℃. When the temperature was decreased,the effect of suspended media was decreased,but the contribution of zeolite to ammonia nitrogen removal was increased. According to the principle of aerobic nitrification,nitrogen mass balance was calculated,and it was found that some of ammonia nitrogen was adsorbed by zeolite at low temperature stage. Further studies showed that bio-zeolite still had a high adsorption performance for ammonia nitrogen.更多还原