一体化A/O生物膜反应器低温硝化研究

Study on Nitrification in a Combined Biofilm Reactor at Low Temperature

采用自行设计制作的新型一体化A/O生物膜反应器，研究了温度、进水碱度对反应器硝化性能的影响．结果表明，当反应器温度控制在20，15和10℃时，硝化率分别为98％，90％和60％．此时进水COD和TN浓度分别为100—150mg／L和65—78mg／L．总氮去除率分别为50％，30％和20％．当反应器温度控制在8℃，进水中不加有机碳源，随着进水碱度的增加，硝化率从72％提高到95％，在低温下取得了良好的硝化效果．当进水碱度为280mg／L时，反应器各区出现亚硝酸盐积累，亚硝化率达到80％．详细分析了形成亚硝酸盐积累的原因．

An experimental study was carried out to investigate the nitrification performance of a novel combined airlift biofihn reactor devised and made by our lab. The results showed that when the temperature of the reactor was maintained at 20,15 and 10℃ ,the nitrification efficiency was 98% ,90% and 60% respectively with the influent COD ranging between 100 - 150 mg/L and TN being 65 - 78 mg/L. Under the above conditions the total nitrogen removal efficiency was 50% ,30% and 20% as a result of the absence of organic carbon and low temperature. At 8℃ ,nitrification efficiency increased （from 72% to 95% ） in evidence with the increasing influent alkalinity when no organic carbon was added to the influent. When the influent alkalinity was 280 mg/L,nitrite accumulation occurred in each zone of the reactor. The accumulation rate was as high as 80% . The reason of nitrite accumulation was analysed in detail.