流化填料型A^2O工艺处理城市污水中试研究

Study on the A^2O Process with Fluidized Carriers in Municipal Wastewater Treatment

目的研究厌氧-缺氧-好氧(A2O)工艺对城市污水的去除特性.为已建污水处理厂的提标改造工程提供便于实施的工艺.方法将A2O工艺与生物膜法结合,通过向反应器好氧池中投加聚氨酯流化填料强化脱氮除磷效率.结果经A2O工艺处理的系统出水COD质量浓度为33.1 mg/L,NH+4-N质量浓度为4.56 mg/L,TN质量浓度为14 mg/L,TP质量浓度为0.43mg/L,好氧区对于TN的去除最高可达系统TN去除率的14.2%,好氧区内TN的流失说明系统中出现了明显的同步硝化反硝化现象.城市污水出水水质达到《城镇污水处理厂综合排放标准》一级A标准.结论 A2O工艺对于水质水量的变化具有较强的抗冲击负荷能力,投加填料后,即使在进水水质波动很大的情况下,系统对于水中污染物仍能保持很高的去除率,出水水质稳定.

The purpose of this paper is to investigate the treatment efficiency of A^2O process treating munici- pal wastewater. It was a facilitated process which could be used in renovation project of sewage plant. Traditional A^2O process was combined with biofilm. Fluidized carriers were added into the aerobic zone to enhance the efficiency of nitrogen and phosphorus removal. The average effluent COD was 33.1 mg/L, NH4^＋ -N was 4.56 mg/L, TN was 14 mg/L, and TP was 0. 43 mg/L. TN removal rate in aerobic zone was up to 14.2% in the system. TN loss of aerobic zone showed the phenomenon of simultaneous nitrification and denitrification happened. The effluent water quality achieved ＂Urban sewage treatment plant discharge standard＂ level A standard. The process had a strong resistance to impact load of water quality and quantity. After dosing fluidized carriers, even in the case of large fluctuations of water quality conditions, system could keep high pollutant removal rates, the effluent water quality was stable.