HRT对瓷粒BAF处理生活污水效能的影响

Effect of Hydraulic Retention Time on Treatment Efficiency of Porcelain Particles Biological Aerated Filter for Domestic Wastewater

通过实验室模型试验研究了瓷粒曝气生物滤池处理生活污水的效能,分析了在气水比一定的条件下,水力停留时间(HRT)变化对曝气生物滤池处理效能及运行特性的影响规律。考察了不同HRT运行下,COD、NH4+-N、NO2--N、NO3--N、TN、SS等指标的变化,结果表明,当进水COD为280～320mg/L,气水比为3:1,HRT为10h的条件下,处理效果最好,其中COD、NH4+-N、TN、SS的平均去除率分别为92.6%、97.8%、34.7%、84.2%。当HRT逐渐降低时,以上指标的去除效果都有所下降,但去除效能的下降与HRT的降低不呈线性关系。当HRT降至3h,去除效能有一定程度的上升,COD、NH4+-N、TN、SS的去除率有所增加。

A bench scale study was done to evaluate the effect of hydraulic retention time （HRT） on the efficiency of porcelain particles biological aerated filter （BAF） by using domestic wastewater as feed water. Variations of operation pattern and treatment efficiency of bioreactor resulted from the change of HRT were analyzed with stable gas to liquid ratio. The concentration changes of COD, NH4^＋-N, NO2^--N, NO3^--N, TN and SS in different HRT were investigated. Experimental results showed that when COD concentration in influent was between 280-320 mg/L, gas to liquid ratio was 3 ： 1 and HRT was 10h, the removal efficiency was the best, with average removal efficiency of COD, NH4^＋-N, TN and SS as 92.6%, 97.8%, 34.7% and 84.2% respectively. When HRT was decreased gradually, removal efficiency of COD, NH4^＋-N, TN and SS decreased, and there was no linear relationship between HRT and removal efficiency. When HRT was decreased to 3h, removal efficiency of COD, NH4^＋-N, TN and SS increased to a certain extent.