多级AO生物膜反应器的优化设计与实验研究

The Optimal Design and Experiment Study on Multilevel Anoxic Oxic Bio-film Reactor

为确保脱氮效果并减少剩余污泥产量,构建多级AO生物膜反应器,在多级AO反应器内投加球形多孔微生物载体,缺氧段与好氧段体积比为1:2,填料装填体积比为50%,实验进水为生活污水。结果表明,在多级AO生物膜反应器中,系统出水TN的质量浓度为5~13 mg/L,与常规多级AO工艺相比,对TN的去除率提高了12%;污泥表观产率为24 mg/g,污泥产量比传统活性污泥法降低了90%。系统出水COD≤29.8 mg/L,NH_3-N、TN的质量浓度分别≤4.3、≤13.2 mg/L,去除率分别为93.2%、84.1%、75.4%,出水水质达到了GB 18918-2002的一级A标准,并实现了污泥减量的目的。

In order to ensure the effective nitrogen removal and reduce sludge production, spherical composite porous balls were added in the multilevel anoxic oxic reactor with anoxic and oxic volume ratio was 1：2, the filling ratio was 50%, and established a multilevel anoxic oxic bio-film reactor, and the test water was domestic sewage. The results showed that the mass concentration of TN of the system effluent was 5-13 mg/L, which compared with the conventional multilevel anoxic oxic process, the removal rate of TN increased by 12%; sludge production was 24 mg/g, which compared with conventional activated sludge process, the sludge production was reduced by 90% in the multilevel anoxic oxic bio-film reactor. The mass concentration of COD, NH3-N and TN of effluent were equal to or less than 29.8 mg/L, 4.3 mg/L and 13.2 mg/L with the removal rate 93.2%, 84.1%, 75.4% respectively. The effluent quality met the first level A standard GB18918-2002, and the goal of sludge reduction was achieved.