改良型A^2/O工艺在低温不同污泥负荷下的运行研究  

Operation of Modified A^2/O Process at Low Temperature and Different Sludge Loadings

作　　者：李思敏[1] 郝同 王若冰[1] 唐锋兵[1] 程伟帅[1] 

机构地区：[1]河北工程大学城市建设学院,河北邯郸056038

出　　处：《中国给水排水》2014年第13期64-68,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07203-003);河北省应用基础研究计划重点基础研究项目(12966738D);邯郸市科学技术研究与发展计划项目(1213109010G)

摘　　要：以城市污水为研究对象,重点考察了分点进水改良型A2/O工艺在温度<11.5℃时的除污性能,原水按1∶1的比例分配给厌氧池和缺氧池,以合理分配厌氧池和缺氧池所需的碳源;厌氧池和缺氧池出水均进入好氧池。试验结果表明,在HRT为14~8 h、SRT为15 d左右、MLSS为3 000~4 000 mg/L、好氧池DO为2 mg/L左右、污泥回流比为75%、硝化液回流比为200%的条件下,采用0.22、0.31和0.39 kgCOD/(kgMLSS·d)三种不同污泥负荷时,系统对COD的去除率随着负荷的增大而减小,平均去除率由87.2%下降到80.7%,出水COD值均达到一级B排放标准;低温对脱氮影响较大,而负荷变化对脱氮的影响较小;随着温度降低和污泥负荷的增大,硝化/反硝化作用减弱,系统中出现了亚硝态氮的积累,且在缺氧池发生了反硝化除磷现象;低温高负荷条件下,好氧池发生了非丝状菌污泥膨胀。The nitrogen and phosphorus removal performance of a step-feed modified A2/O process at less than 11.5 ℃ was investigated by using municipal sewage. bic tank and an anoxie tank separately according to the proportion The raw sewage flowed into an anaero- of 1 ： 1 to distribute carbon source rea- sonably. The effluents from the anaerobic and anoxic tanks entered an aerobic tank. Under the controlled conditions： HRT 14 to 8 h, SRT 15 d, MLSS 3 000 to 4 000 mg/L, DO 2 mg/L, sludge reflux ratio 75%, and nitrification liquid return ratio 200%, the effects of different sludge loadings were studied, which were 0.22, 0.31 and 0.39 kgCOD/（ kgMLSS ~ d） respectively. The removal efficiency of COD decreased with the increasing of sludge loading and the average removal efficiency reduced from 87.2% to 80.7%. The effluent COD met the first level B national discharge standard. The nitrogen removal was heavily affected by low temperature but slightly affected by change in sludge loading. The nitrification/ denitrification was weakened with temperature drop and the increasing of sludge loading, and the accumu- lation of nitrite nitrogen occurred in the system. anoxic tank. At low temperature and high sludge Also, denitrifying phosphorus removal occurred in the loading, the filamentous sludge bulking occurred in theaerobic tank.

关 键 词：改良型A2/O工艺 脱氮除磷 低温 污泥负荷 反硝化除磷 

分 类 号：X703[环境科学与工程—环境工程]