曝气生物滤池处理农村污水的中试研究

摘要

The sewage in rural areas was treated by a pilot scale biological aerated filter (BAF),to study its performance characteristics and influencing factors. The experimental results showed that the removal efficien-cy of COD and NH_3-N in BAF system were above 80% and 90% respectively at the hydraulic retention time(HRT) of 15 h,air-water ratio of 5: 1 and influent COD concentration ≤ 250 mg/L. The treated effluent meets the GB18918-2002 1A discharge standard of pollutants for municipal wastewater treatment plant. The pollutant concentrations of the treated effluent were increased when the BAF run in winter comparing with in summer. But the removal rates of COD and NH_3-N in the BAF system were still meet the discharge standard.%采用研制的曝气生物滤池对农村污水进行处理,研究其性能特点和影响因素.结果表明:在气水比为5:1,水力停留时间(HRT)为15 h,进水COD浓度在250 mg/L以下时,COD和氨氮的去除率分别在80%和90%以上,出水COD和氨氮值达到国家<城镇污水处理厂污染物排放标准>一级A标准;反应器在冬季水温12℃以上运行时出水COD和氨氮值比在夏季运行时有所上升,但去除率仍在80%和90%以上,可以达到排放标准.