一体化A/O移动床生物膜反应器中DO、TN分布及脱氮效果研究

采用一体化A/O移动床生物膜法工艺，以模拟生活污水研究了该工艺的除碳脱氮效果，并对一体化移动床生物膜反应器的好氧区和缺氧区各纵向断面的COD、DO、NH₃-N、TN、NO^-₃-N和NO^-₂-N进行了检测，通过对缺氧区各断面的DO和TN浓度分布情况，分析了脱氮的产生过程。试验结果表明: 在水力停留时间HRT＝12 h，好氧区DO保持5 mg/L左右，COD进水浓度处于250～400 mg/L时，COD的去除率均在90%以上，且出水COD均在40 mg/L以下；TN进水浓度为20～50 mg/L时，NH₃-N去除率高于90%，其出水浓度可达到5 mg/L以下，脱氮效率也较高，TN去除率可达到65%～85%。COD和NH₃-N的浓度分布状况表明该一体化A/O移动床生物膜反应器的流态趋于全混式。

Distributions of dissolved oxygen and total nitrogen and efficiency of nitrogen removal in the integrative A/O moving bed biofilm reactor

Carbon and nitrogen removal for simulated municipal wastewater was studied by using the inte-grative A/O moving bed biofilm reactor. Concentration distributions of COD,DO,NH_3-N,TN,NO_3~--N and NO_2~--N were detected respectively in the different longitudinal sections of the oxic and anoxic area. Denitrifica-tion course was discussed according to concentration distributions of DO and TN in the anoxic area. The resultsshow that the removal rate of COD,NH_3-N and total nitrogen (TN) is more than 90%,above 90% and 65% ~85% respectively,and the effluent COD and NH_3-N is less than 40 mg/L and 5 mg/L,when HRT is 12 h,the influent COD concentration is 250～450 mg/L,the influent TN is 20～50 mg/L,and DO is about 5 mg/L in the oxic area. Concentration distributions of COD and NH_3-N showed the hydrodynamics in the integrative A/O mov-ing bed biofilm reactor is near to completely mixed.