曝气生物滤池用于处理小城镇生活污水的试验研究

Study on Domestic Sewage Treatment by Biological Aerated Filter

[目的]研究曝气滤池对小城镇生活污水的处理效果。[方法]采集小城镇污水水样,以生物曝气滤池法进行处理,监测NH3-N、TN、TP和COD的含量变化。[结果]生物滤池对小城镇生活污水的处理效果良好,特别是良好的COD去除效果,在进水NH3-N、TN、TP和COD分别为9.7～68.9 mg/L,18.1～73.2 mg/L,1.79～8.78 mg/L,170～336 mg/L时,生物滤池对NH3-N、TN、TP、COD的平均去除率可分别达到85.9%、61.4%、76.7%和89.2%,其中出水COD达到一级A类标准(GB 18918-2002),出水NH3-N、TN、TP总体达到一级B类标准。同时研究显示,日处理量的提高有利于提高出水水质,特别是对出水TN、TP有明显的改善效果;但进水浓度过高不利于提高出水水质。[结论]生物曝气滤池可用于小城镇生活污水的处理,能够达到或优于排放标准,且经济高效。

[Objective] To study the treatment effect of domestic sewage in small towns by Biological Aerated Filter（BAF）.[Method] The domestic sewage was sampled from small towns,and then treated by BAF,the contents of NH3-N,TN,TP and COD were monitored.[Result] The BAF had good effect for treating domestic sewage,especially COD,The contents of NH3-N,TN,TP and COD in influent were 9.7-68.9 mg/L,18.1-73.2 mg/L,1.79-8.78 mg/L and 170-336 mg/L,respectively,their average removal efficiency was 85.9%,61.4%,76.7% and 89.2%,respectively,and the effluent COD met the first class A criteria（GB 18918-2002）,the effluent NH3-N,TN and TP met the first class B criteria.Meanwhile,the study revealed that the daily treatment amount showed a positive effect on effluent especially on TN and TP,but too high influent concentration was not good for the improvement of effluent quality.[Conclusion] The biological aerated filter can be used for the treatment of domestic sewage in small towns with high economic benefits,and the treated sewage can be up to or above the discharge standards.