曝气生物活性炭滤池深度处理高浓度氨氮原水

Advanced treatment of raw water with high ammonia nitrogen by aeration-BAC filter

实验研究曝气生物活性炭滤池对于高浓度氨氮原水的处理效果以及工艺运行稳定情况。以某自来水厂常规工艺沉淀池出水预加硫酸铵作为研究对象,原水氨氮平均浓度3.67 mg/L,实验条件：温度31.2℃,pH 7.13,滤速8~12 m/h,气水比0.5和1。采用3种不同工况条件进行实验,确定滤速10 m/h和气水比0.5的为最佳运行工况。在此工况下曝气生物活性炭滤池对于氨氮和COD Mn的平均去除率分别达到87.5%和19.2%,亚硝酸盐积累率为0.9%;出水氨氮浓度达到生活饮用水卫生标准GB5749-2006。同时炭滤池的出水浊度相比进水略微上升。

This pilot scale experiment was to research on the treatment of raw water with high ammonia nitrogen by aeration-BAC filter and on the stability of the process. The sedimentation tank effluents of the conventional process added with ammonium sulfate was used as raw water,of which the ammonia average concentration was 3. 67 mg/L. Filtration rate of 10 m/h and air-water ratio of 0. 5 were considered as the best while filtration rate of 8 to 12 m/h,air-water ratio of 0. 5 to 1 were selected as the test conditions. The result shows that the aeration-BAC filter is an effective treatment process,with ammonia nitrogen and COD Mn reduced by 87. 5% and19. 2%,respectively,and the average accumulation rate of nitrite nitrogen is 0. 9%. The ammonia nitrogen of the effluent can meet the drinking water health standards GB5749-2006. In addition,the turbidity of the effluent of aeration-BAC filter compared to the raw water rises slightly.