下向流前置反硝化生物滤池沿滤料层高度的除污性能研究  

The pollutant removal efficiencies along the height of filter media layer by downflow pre-denitrification biofilter

作　　者：董玲[1] 孙楠[1] 

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002

出　　处：《环保科技》2011年第2期15-18,39,共5页Environmental Protection and Technology

摘　　要：采用下向流前置反硝化滤池工艺对城市污水进行处理,研究了DN池和CN池沿滤料层高度方向上COD、NH4+-N、NO3--N、NO2--N和TN的去除变化规律。结果表明:DN池对COD的去除贡献比CN池大,其对COD的去除主要集中在0～400 mm滤料层,CN池对COD的降解较平缓。DN池对NH4+-N的去除只有13.4%左右,CN池对NH4+-N的去除超过90%,硝化作用主要集中在CN池滤料层中上部。TN主要在DN池中得到去除,800～1 600 mm段对TN去除贡献最大。回流比为200%时,进入DN池的DO浓度有1.8 mg/L左右,在滤池顶部0～400 mm区域内被迅速消耗掉,CN池的DO沿程逐渐升高,在进水端附近只有0.1～0.6 mg/L,出水达到5.1 mg/L。We use the downflow pre-denitrification biofilter to treat municipal wastewater and study the removal efficiencies of COD,NH＋4-N,NO-3-N,NO-2-N and TN along the height of filter media layer by DN and CN filter.The results show that the removal efficiency of COD in DN reactor is better than that in CN,the optimal sections of denitrification are 0 to 400 mm.The removal efficiency of NH＋4-N in DN is 13.4%,while in CN is more than 90%.The best places of nitrification are on the top and middle layers of CN biofilter.Most of TN is removed in DN reactor,the optimal sections of denitrification are 800 to 1600 mm.When the reflux ratio is 200%,the concentration of DO inflowed in DN reactor reaches 1.8 mg/L and could be consumed quickly in 0 to 400 mm sections on the top of filter.The concentration of DO increases along the layer of CN reactor,which is between 0.1 to 0.6 mg/L in entry and reaches 5.1 mg/L in exit.

关 键 词：下向流前置反硝化 滤层高度 去除效果 

分 类 号：X703[环境科学与工程—环境工程]