包埋硝化菌流化床与接触氧化固定床除氨氮效果对比

Comparison of Ammonia Nitrogen Removal Rate between Fluidized Bed Reactor with Embedded Nitrobacteria and Fixed Bed Reactor with Bio-contract Oxidation Process

以固定化包埋硝化菌颗粒作为流化床的载体,以PVC弹性填料作为固定床的载体,使硝化菌分别以包埋和生物膜的形式与载体结合,通过试验对比了流化床和固定床去除水中氨氮的效果。结果表明,在相同条件下,流化床的硝化效率高于固定床的;两反应器内均存在亚硝酸盐氮积累现象,且流化床的积累浓度高于固定床的;COD及氨氮负荷的短期冲击对两反应器的硝化效果几乎不会产生影响;流化床中的包埋固定化硝化菌具有更强的抗温度变化能力;在反应器连续运行条件下,流化床和固定床对氨氮的去除率分别为96%和80%。

Taking immobilized embedded nitrobacteria pellet as cartier in fluidized bed reactor, and PVC elastic filler as carrier in fixed bed reactor, nitrobacteria were respectively immobilized on encapsulated beads and biofilm in the both reactors. Ammonia nitrogen removal effect in the both reactors was compared. The results show that the nitrification efficiency in fluidized bed is higher than that in fixed bed under the same condition. Nitrite accumulation takes place in the both reactors and accumulation strength in fluidized bed is higher than that in fixed bed. Short-term impact of COD and ammonia nitrogen load hardly affects the nitrification effect in the both reactors. Furthermore, the immobilized embedded nitrobacteria in fluidized bed have stronger ability against temperature change. During the continuous running, the ammonia nitrogen removal rates in fluidized bed and fixed bed are 96% and 80% respectively.