气水体积比对BAF处理效果的影响

摘要

在不同的气水体积比条件下,对BAF处理城市污水的效果进行了研究,结果表明,气水体积比对BAF的处理效果具有重要影响,当气水体积比较小时,BAF中溶解氧浓度较低,好氧微生物的生长受到抑制,BAF的去除效果较差;当气水体积比较大时,气流对滤料的冲刷作用较强,影响BAF的处理效果,且动力费用及运行成本较高;当气水体积比为3:1时,BAF对SS、CODCr、NH3-N、TP的去除率分别为97.69％、86.76％、92.18％、31.04％,去除效果较好;因此本试验条件下BAF的最佳气水体积比为3:1.%The effect of BAF on treatment of urban sewage at different air-water volume ratios was studied. The results showed that, air-water volume ratio had a great influence on the treatment efficiency of BAF, when the ratio was low, the dissolved oxygen concentration was lower, the growth of aerobic microorganisms was inhibited, and the treatment efficiency of BAF was poor; when the ratio was high, the treatment efficiency of BAF was affected by the strong flushing action of air flow to filter material, and the power expense and the operation cost were both higher; when the ratio was 3 : 1, the removal rates of SS, CODCr, NH3-N and TP were 97.69%, 86.76%, 92.18% and 31.04% respectively, the removal effect was good. Therefore, the optimal air-water volume ratio for the BAF under the experimental condition was determined to be 3 : 1.