曝气生物滤池后置反硝化效能研究

Research on BAF post-denitrification performance

以甲醇为外碳源,对生活污水进行两级串联O-A曝气生物滤池脱氮及去除COD的试验研究。采用陶粒为填料,向二级滤柱中投加甲醇,确定甲醇的最佳投量,考查该种形式的曝气生物滤池脱氮效果及出水COD浓度是否达标。试验表明,甲醇投量为20mg/L时,曝气生物滤池二级出水COD﹑NH3-N﹑NO3--N﹑TN平均质量浓度分别为49.3﹑3.3﹑1.6﹑5.5mg/L,其去除率分别为85.3%﹑85.7%﹑77.1%﹑82.0%。达到很好的脱氮及去除COD效果。出水水质达到了《城镇污水处理厂污染物排放标准》一级标准中的B级标准。

With methanol as external carbon source, the experiment research on denitrification and COD removal from domestic sewage by two-stage O-A BAF were carried out. Using haydite as padding, adding methanol into the second pillar and determining its best dosage, and then checking whether the denitrification effect and the mass concentration of COD in the effluent from the said BAF reach the mark. The results showed that, when the methanol dosage was 20 rag/L, the average mass concentration of COD, NH3-N, NO3--N, TN in secondary effluent from BAF were 49.3, 3.3, 1.6 and 5.5 mg/L respectively, the removal rates were 85.3%, 85.7%, 77.1% and 82.0% respectively, a good removal effect of nitrogen and COD was obtained. The effluent quality met the specification for B-class standard of Grade 1 in Discharge standard of pollutants for municipal wastewater treatment plant.