气水比对中置曝气生物滤池处理微污染原水的影响

THE EFFECT OF THE RATIO BETWEEN AIR AND WATER ON THE TREATMENT OF MICROPOLLUTION RAW WATER IN MID POSITIONED BIOLOGICAL AERATED FILTER

采用中置曝气生物滤池工艺在南方某水厂进行实验,研究在不同气水体积比的条件下对中置曝气生物滤池去除NH3-N的影响。结果表明,处理水体积流量为8 m3/h时,气水体积比从0.1到0.6逐级升高,中置曝气生物滤池对NH3-N的去除率从55.26%增大到92.86%,当气水体积比分别为0.3和0.4时,本工艺对NO2--N的平均去除率分别为92.48%和99.21%,综合考虑中置曝气生物滤池工艺运行效果与成本,确定0.3为优化气水体积比。

The effect of volume ratio of air and water on the removal of ammonia nitrogen was investigated in Mid positioned biological aerated filter （BAF） which was located in a water plant in the South China. The results indicated that when the volume ratio rose from 0.1 to 0.6 gradually, the removal efficiency increased from 55.26% to 92.86% with capacity of 8 m3/h volume flow. When the ratio of air and water was 0.3 and 0.4 respectively, the average removals of NO2＋-N could reach 92.48% and 99.21% respectively, in this treatment process. Hence, taking into account the efficiency and cost in this system, the optimal ratio was determined to be 0.3.