Abstract
The present study aims to investigate the performance of an pilot-scale anaerobic-aerobic system, provided with hospital sewage, consisted of anaerobic fixed bed reactor (AFBR) followed by biological aerated filter (BAF). Effluent recirculation will be adopted with 0.5, 1.0, 2.0 and 3.0 ratios, seeking denitrification. The steps will be as following: forming active biomass and establishin…