Biological Treatment of Dairy Wastewater in an Upflow Anaerobic Sludge-Fixed Film Bioreactor

摘要

An upflow anaerobic sludge-fixed film (UASFF) reactor is a granular sludge bioreactor that was used for the rapid biological conversion of organic matter to biogas with the aids of aggregated microbial consortium. The major problem associated with theconventional UASB reactor is the long duration for startup period. In this study, UASFF bioreactor with tubular flow behavior was developed in order to shorten the start-up period at low HRT. The reactor was operated at 36 deg C and HRT of 36 and 48h. The organic loading rate was gradually increased from 7.9 to 45.42 g COD/l.d. In this research flocculated granular sludge was built in a short period of 4 to 5 days. The core of the granular sludge was developed within 20 days. At HRT 48 h and temperature 36 deg C, the COD removal rate and lactose conversion of 97.5 and 98 percent were obtained, respectively. The use of an internal upflow anaerobic fixed film section caused the flocculated biomass was trapped in the sludge blanket and the delivery of biogas was easily performed.