Cultivation of Nitrifying and Nitrifying-Denitrifying Aerobic Granular Sludge for Sidestream Treatment of Anaerobically Digested Sludge Centrate

In this study, three 1.2-L aerobic granular sludge sequencing batch reactors (AGS-SBRs) were used to cultivate nitrifying and nitrifying-denitrifying granules (w/supplemental carbon) investigate sidestream treatment of synthetic-centrate real-centrate samples from Ashbridges Bay Treatment Plant (ABTP) in Toronto, Ontario, Canada. Results showed that although the cultivation distinct was not observed reactors, volume index (SVI30) values achieved while treating real synthetic centrate 72 ± 12 mL/g 59 11 (after day 14), respectively. Ammonia-nitrogen (NH3-N) removal SBRs 93 19% 94 16% for centrate, Granules with a round structure successfully formed SBR, resulting an SVI30 52 23 mL/g. NH3-N, chemical oxygen demand (COD) phosphorus (P) SBR 92 9%, 5%, 81 14% (7th 114th day), respectively low nitrite (NO2-N) nitrate (NO3-N) concentration effluent indicating simultaneous nitrification-denitrification (SND) activity. High nutrient efficiencies via nitrification SND pathways shows AGS technology is viable process sidestreams generated WWTP.