Efficiency of Intermittent Baffled Biological Aerated Filter for Domestic Sewage Treatment in Small Towns

The efficiency of baffled biological aerated filter(BBAF)under intermittent aeration mode for domestic sewage treatment in small towns was studied,and the influence of aeration time/non-aeration time on the treatment effect was investigated. The results show that under the conditions of air/wastewater ratio of 8 ∶1,aeration time/non-aeration time of 1.5 h/1 h and 1.25 h/1.25 h,and when the influent COD,TN and TP are 53 to 275 mg/L,16.83 to 47.68 mg/L and 1.58 to 3.75 mg/L respectively,the effluent quality can meet the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The aeration time/non-aeration time of 1.25 h/1.25 h saves energy relatively,and it can be used as main running condition.