COD对颗粒污泥厌氧氨氧化反应性能的影响

研究了COD对颗粒污泥厌氧氨氧化反应的影响,并对颗粒污泥的厌氧氨氧化脱氮性能进行了分析.厌氧颗粒污泥取自实验室长期运行的EGSB生物脱氮反应器,实验用水为人工配水,以葡萄糖为有机碳源;主要考察了COD对NH4 -N、NO2--N、NO3--N和TN去除的影响.结果表明:当进水不含COD时,反应器对NH4 -N、NO2--N和NO3--N和TN的去除率分别为12.5%、29.1%、16.1%和16.3%;当COD浓度分别为200mg/L、350mg/L和550mg/L时,反应器对NH4 -N的去除率分别为14.2%、14.2%和23.7%,对NO2--N的去除率均接近100%,对NO3--N的去除率分别为94.5%、86.6%和84.2%,对TN的去除率分别为50.7%、46.9%和50.4%,COD去除率分别为85%、66%和60%.分析发现,在反应初期,氨氮的去除主要通过厌氧氨氧化过程实现,随着反应的进行,反硝化菌活性逐渐提高,传统的反硝化过程占优势.同时还观察到,在反应初期COD对氨氮去除的抑制作用非常明显.图2参21

EFFECT OF COD CONCENTRATION ON PERFORMANCE OF ANAEROBIC AMMONIUM OXIDATION BY GRANULAR SLUDGE

The effect of COD (chemical oxygen demand) concentrations on the anaerobic ammonium oxidation (ANAMMOX) by granular sludge from an expanded granular sludge bed (EGSB) reactor was investigated. The experimental results showed that when the COD concentrations in the reactors were 0, 200 mg/L, 350 mg/L and 550 mg/L, respectively, the NH~ _4-N removal efficiency was 12.5%, 14.2%, 14.2% and 23.7%, the removal amount of NO~-_2-N was almost the same, the nitrate removal efficiency was 16.8%, 94.5%, 86.6% and 84.2%, and TN removal efficiency was 16.3%, 50.7%, 46.9% and 50.4%; moreover, the COD removal efficiency was 85%, 66% and 60%, and the COD removal rate was 27.42 mg h~-1 L~-1, 61.88 mg h~-1 L~-1 and 97.8 mg h~-1 L~-1. The COD concentrations could greatly affect anaerobic ammonium oxidation by granular sludge. Fig 2, Ref 21