曝气生物滤池去除有机物及硝化氨氮的影响因素研究

Study on the effect of organic removal and ammonia nitrogen nitrified by biological aerated filter

采用以陶粒为填料的曝气生物滤池（BAF）处理低浓度生活污水，研究在气水比一定的条件下，水力负荷、有机负荷及氨氮负荷对BAF去除有机物及硝化氨氮的性能的影响。研究结果表明，当试验进水COD为105．8～156.6mg／L，气水比为3；1的条件下，降解有机物的最佳水力负荷为1．35～1.68m^3／（m^2·h），COD平均去除率为86．3％。氨氮负荷是影响反应器硝化性能的直接因素。当水力负荷为1．05m^3／（m^2·h），平均进水COD为106.1mg／L时，若使出水氨氮低于15mg／L，则反应器能承受的最大进水氨氮负荷为0．5kg／（m^3·d）左右。并确立了相应的反应器动力学模型。

The biological aerated filter（BAF） with granular media had been adopted on the actual lower concentrated domestic sewage treatment. They were studied for the influencing factors of hydraulic loading, organic and ammonia nitrogen loading on the performances of organic removal and ammonia nitrogen nitrified by BAF with stable gas to liquid ratio. The results showed that when COD in influent was between 105.8-156.6 mg/L, the gas to liquid ratio was 3 ： 1 and the optimum hydraulic loading on degradation of organic compound was between 1. 35-1. 68 m^3/（m^2·h）, the average COD removal efficiency was about 86.3%. The direct affected factor of nitrification was ammonia nitrogen loading. Under the conditions of hydraulic loading and COD average value in influent were 1.05 m^3/（m^2·h） and 106.1 mg/L respectively, the maximum loading of ammonia nitrogen for the reactor was about 0.5 kg/（m^3·d）, which the concentration of ammonia nitrogen in effluent was less than 15 mg/L. And then the kinetic model of the reactor was established accordingly.