缺氧/好氧BAF工艺的沿程生化特性研究

Biochemical Characteristics along Media Layer of Anoxic/Aerobic Biological Aerated Filter Process

考察了缺氧/好氧曝气生物滤池(BAF)工艺中污染物沿滤料层高度的变化规律。结果表明,在缺氧段和好氧段的滤料高度分别为0.65和1.3m、回流比为200%的条件下,当进水COD、NH3-N和TN分别为309.1、30.3和41.3mg/L时,对总氮的去除主要集中在缺氧段滤料层高度<0.5m的区间,总去除率可达到70%左右;而好氧段主要去除有机物和氨氮,其中硝化菌的活跃层较异养菌的高,对有机物的降解主要集中在滤料层高度<0.5m的区间,而对氨氮的去除主要发生在0.5m以上的滤料层,总去除率分别可达85%和88%以上。

The change of pollutants along tile filter media height in anoxic/aerobic BAF process was investigated. The experimental conditions are as follows： the filter media heights in the anoxic and aerobic zones are 0.65 m and 1.3m respectively; the reflux ratio is 200% ; the influent COD, NH3 - N and TN are 309.1 rag/L, 30.3 mg/L and 41.3 mg/L respectively. The removal of TN occurs mainly in the filter media height of below 0.5 m in the anoxic zone, and the total removal rate can achieve 70%. However, the removal of COD and NH3 - N occurs mainly in the aerobic zone, the activity level of nitrobacteria is higher than that of heterotrophic bacteria, the removal of COD occurs mainly in the filter media height of below 0.5 m, the removal of NH3 - N occurs mainly in the filter media height of above 0.5 m, and the total removal rates are above 85% and 88% respectively.