膨胀床反硝化滤池用于污水深度处理中试研究

以珠三角流域某污水处理厂一、二期混合出水为研究对象,采用中试规模的膨胀床反硝化滤池工艺进行深度处理,并针对滤池特性优化反冲洗方式。结果表明,膨胀床反硝化滤池对污水中的TN、COD、TP均具有良好的去除效果,当进水TN的质量浓度在20~25 mg/L外加50 mg/L乙酸钠作碳源时,出水TN的质量浓度低于11 mg/L;在滤池中投加50 mg/L的聚合氯化铝微絮凝过滤除磷,出水TP的质量浓度低于0.4 mg/L,稳定达到GB 18918-2002的一级A标准,满足污水处理厂提标改造要求。

Pilot-scale Study on Expanded Bed Denitrification Filter for Advanced Wastewater Treatment

The pilot scale expanded bed denitrification filter was used for advanced treating phaseⅠandⅡmixed effluent from a sewage treatment plant in the Pearl River Delta,and its backwash mode was optimized according to the characteristics of the filter.The results showed that expanded bed denitrification filter had better removal efficiency of TN,COD and TP.When the influent mass concentration of TN was 20 to 25 mg/L and adding 50 mg/L sodium acetate as carbon source,the effluent mass concentration of TN was less than 11 mg/L.When 50 mg/L PAC was added into the filter for dephosphori-zation by micro-flocculation filtration,the effluent concentration of TP was less than 0.4 mg/L,which could stably meet the first grade A standards of GB 18918-2002 and meet the requirements of the plant upgrading and reconstruction.