A~2/O~2生物膜工艺处理焦化废水研究

采用A~2/O~2生物膜工艺处理焦化废水,分别考察了厌氧(A_1)、缺氧(A_2)、一级好氧(O_1)和二级好氧(O_2)反应器对污染物的去除效果.在A_1、A_2、O_1和O_2反应器的HRT分别为15.5、15、12、12 h,水温为20～30℃,pH值为7.0～9.5,回流比为3.0的条件下,各反应器对COD的平均去除率分别为31.0%、27.6%、48.1%和8.2%;在A1中NH_3-N浓度增加了25.2%,A_2、O_1、O_2反应器对NH_3-N的平均去除率分别为6.2%、46.7%和76.7%;系统出水COD、NH_3-N的平均浓度分别为227、11.5 mg/L,对COD、NH_3-N的平均去除率分别为87.2%、94.1%.

Treatment of Coke Plant Wastewater by Biofilm Reactor Based on A~2/O~2 Process

The A~2/O~2 biofilm process was used to treat coke plant wastewater, and the removal efficiencies of pollutants by anaerobic reactor A_1 , anoxic reactor A_2, one-stage aerobic reactor O_1 and twostage aerobic reactor O_2 were investigated respectively. When HRT of A_1, A_2, O_1 and O_2 reactors is 15.5 h, 15 h, 12 h and 12 h respectively, the water temperature is 20 to 30 ℃, pH is 7.0 to 9.5 and the reflux ratio is 3.0, the average removal rate of COD in the reactors is 31.0%, 27.6%, 48.1% and 8.2% respectively. The increment of ammonia nitrogen is 25.2% in A_1 reactor, and the average removal rates of ammonia nitrogen in other reactors are 6.2%, 46.7% and 76.7% respectively. The average concentrations of COD and ammonia nitrogen in the system effluent are 227 mg/L and 11.5 mg/L respectively,and the average removal rates of COD and ammonia nitrogen are 87.2% and 94.1% respectively.