A/O-超滤膜组合工艺短程反硝化脱氮研究

Nitrogen Removal by Short-Cut Denitrification in A/O and Ultrafiltration Membrane Combination Process

以自配葡萄糖水为原水,采用A/O-超滤膜组合工艺进行短程反硝化脱氮,测定了不同溶解氧(DO)浓度下NO2^--N的积累率,考察了碳氮比(C/N)、DO浓度对短程反硝化脱氮的影响。结果表明,在C/N为3、DO浓度为0.8~1.0 mg·L^-1的工况下运行,脱氮效果最佳,出水TN含量达到《城镇污水处理厂污染物排放标准》的一级A标准。与传统全程硝化反硝化工艺相比,短程反硝化具有脱氮效率高、碳源投加少、能耗低、污泥量少等优点。

Using self-made glucose water as raw water,we used short-cut denitrification in A/O and ultrafiltration membrane combination process for nitrogen removal.Moreover,we determined the accumulation rate of NO2^--N under different dissolved oxygen(DO)concentrations,and investigated the effects of carbon/nitrogen ratio(C/N)and DO concentration on nitrogen removal.The results show that the effect of nirogen removal is the best under the operating conditions as follows:the C/N is 3,and the DO concentration is 0.8-1.0 mg·L^-1.The total nitrogen(TN)content of effluent meets the first-grade standard A of Urban Sewage Treatment Plant Discharge Standard.Compared with the traditional complete nitrification and denitrification process,short-cut denitrification has the advantages of high nitrogen removal efficiency,low carbon source addition,low energy consumption,and low sludge volume.