前置反硝化曝气生物滤池处理低浓度生活污水

在水力停留时间(hydraulic retention time,HRT)为1 h和2 h、气水比为5:1、回流比为100%的条件下,考察了前置反硝化曝气生物滤池工艺对低浓度生活污水的处理效果,并研究了反冲洗对该工艺去除效果的影响。试验结果表明:当HRT为2 h时,前置反硝化曝气生物滤池对低浓度生活污水中COD、NH_4~+-N和TN的平均去除率分别为70%、91%和53%,当HRT降至1 h时,COD、NH_4~+-N和TN平均去除率分别降低12%、34%和20%。在反冲洗后2～3 h,该工艺能恢复到正常处理水平。

Treatment of Low Concentration Domestic Sewage by Pre-Denitrification Biological Aerated Filter

Pre-denitrification biological aerated filter （BAF） was studied, which treated low concentration domestic sewage when hy- draulic retention time （HRT） was 1 h and 2 h, ratio of air and water was 5 ： 1 and recycle ratio was 100 %. The influence of back- washing on the treatment efficiency was also studied. The results show that when HRT is 2 h, the removal effect of COD, NH2 and TN are 70 %, 91% and 53 %, respectively. When HRT is shortened from 2 h to 1 h, the removal effect of COD, NH4±N and TN are decreased by 12 %, 34 % and 20 %, respectively. In 2-3 h after backwash, the system can recover the normal treatment level.