反硝化聚磷菌在低碳源城市污水脱氮除磷处理中的应用

Application of DPBs in the Treatment of Phosphorus and Nitrogen Removal in Municipal Sewage with Low Carbon Source

采用反硝化聚磷菌,解决传统脱氮除磷工艺矛盾,使模拟的低碳源城市污水经济高效地达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准,进行脱氮除磷新工艺试验研究。采用向序批式反应器中投加前期筛选得到的反硝化聚磷菌,通过培养驯化污泥、优化运行模式、过程中补充碳源等手段,处理对象为COD≥450 mg/L、氨氮≥60 mg/L、总氮≥65 mg/L和总磷≥12 mg/L的模拟城市污水。研究结果表明:经过130个周期的运行优化,使投加菌株的污泥具有良好的脱氮除磷性能,反应器平均出水COD、氨氮、总氮和总磷浓度分别为46.94、0.41、14.53、2.53 mg/L,相应去除率分别为90.22%、99.32%、78.31%、81.42%,后期添加15 mg/L Ca(OH)2溶液混凝沉淀后,出水COD、氨氮、总氮和总磷浓度均达到一级A标准。

To solve the conflict among traditional nitrogen removal and phosphorus removal process and to achieve economically and efficiently the Grade A in the GB 18918-2002 Discharge Standard of Pollutants for Municipal Sewage Treatment Plant,the denitrification and phosphorus removal process were studied by denitrifying phosphorus removing bacteria. To deal with simulated municipal wastewater with COD ≥450 mg/L,NH4^＋-N≥60 mg/L,TN≥65 mg/L and TP≥12 mg/L,acclimation of sludge and optimization of operation mode,in the process of adding carbon source were used.Experimental results indicated that after 130 cycles of operation,the sludge adding DPBs has a good performance of nitrogen and phosphorus removal,with average effluent COD,NH4-＋-N,TN and TP concentrations as 46.94 mg/L,0.41mg/L, 14.53 mg/L, 2.53 mg/L respectively and corresponding removal rates as 90.22%, 99.32%, 78.31%, 81.42%respectively. After adding 15 mg/L Ca（OH）2solution,effluent COD,NH4-＋-N,TN and TP concentrations have reached the Grade A standard.