生物预处理后续工艺中炭砂滤池性能研究

STUDY ON THE PERFORMANCE OF CARBON AND SAND FILTER AS SUCCEEDING TREATMENT OF BIOLOGICAL PRETREATMENT

以珠江广州段源水为处理对象,考察了曝气生物滤池(BAF)预处理工艺后炭砂滤池的除污效果。结果表明:炭砂滤池出水NH4+-N、CODMn、NO2--N和浊度的平均值分别为0.13,0.84,0.006mg/L和0.23NTU;相对于沉淀池出水,炭砂滤池对上述指标的平均去除率分别为64.59%,34.88%,81.76%和73.78%。BAF提高了源水的DO浓度,其对浊度和有机物的去除作用降低了炭砂滤池的反冲洗频率,从而有利于提高生物膜中微生物的数量和活性;同时可提高原水的可生化性,也为炭砂滤池的生物降解作用提供了有利条件。

Using Pearl River source water as raw water,the contaminant removal effect of carbon and sand filter after the biological aerated filter(BAF)pretreatment process was investigated.The results show that the average values of NH_4+-N,COD_ Mn,NO_2--N and turbidity in carbon and sand filter effluent are 0.13 mg/L,0.84 mg/L,0.006 mg/L和0.23 NTU.Relative to the effluent of sedimentation tank,the average removal rates of NH_4+-N,COD_ Mn,NO_2--N and turbidity by carbon and sand filter are 64.59%,34.88%,81.76% and 73.78% respectively.DO concentration in source water increases,turbidity and organic concentration decrease after the BAF,which reduces the back washing frequency and is favorable to increase the quantity and activity of the microorganism in biofilm of carbon and sand filter,and then can improve the biodegradability of the source water,which is also favorable for biodegradation of carbon and sand filter.