水力停留时间对BAF除污性能的影响

Effect of Hydraulic Retention Time on Pollutant Removal Performance of BAF

研究了水力停留时间(HRT)对曝气生物滤池(BAF)除污效果的影响。结果表明:HRT对BAF处理效果的影响较大,当HRT为0.63 h时,出水浊度、COD、氨氮和总氮浓度均较高,BAF的除污效果较差;当HRT为0.83 h时,出水COD浓度可降至50 mg/L以下,去除率可达到85.87%;当HRT为1.0 h时,BAF对浊度、氨氮和总氮均有较好的去除效果,去除率分别为95.98%7、7.08%4、0.09%,出水浊度<4 NTU、氨氮<8 mg/L、总氮<35 mg/L。

The removal efficiencies of pollutants in biological aerated filter （BAF） under different hydraulic retention times （HRT） were investigated. The results showed that the HRT had a major influence on the pollutants removal in BAF. When the HRT was 0.63 h, the turbidity, COD, ammonia nitrogen and total nitrogen in the effluent of BAF were higher. When the HRT was 0.83 h, the COD in the effluent was lower than 50 mg/L, and the removal rate was 85.87%. When the HRT was 1.0 h, the BAF had better removal efficiencies of turbidity, ammonia nitrogen and total nitrogen, the removal rates were 95.98%, 77.08% and 40.09% respectively, and the turbidity, ammonia nitrogen and total nitrogen in the effluent were lower than 4 NTU, 8 mg/L and 35 mg/L respectively.