Analysis of Microbial Characteristics for BAF

Abstract

In the biological aerated filter, the number of microorganisms and activity play a key role on the removal of the organic matter. Studying the microbial mass distribution is a useful method for understanding the organic matter degradation mechanism, and it can provide theoretical basis for the operations. Blood count plate was adopted to determine the number of living bacterium, the test results show that attachment biomass of activated carbon reduce with the increase of the height. The biomass and the viable bacterial number counted in the height of 25cm from BAF water level is 15.0 CFU/g·dwC whereas 3.24mg/g·dwc by VAS, which is the largest along the height. Backwashing restored the microbial activity in BAF, after back washing, biomass at different height from25 to105cm are 0.6 mg VAS/g·dwc or so, which is almost similar to filtering beginning.