COD AND NITROGEN REMOVAL OF AEROBIC GRANULAR SLUDGE IN SEAFOOD PROCESSING WASTEWATER TREATMENT
DOI:
https://doi.org/10.11113/aej.v2.15362Abstract
Aerobic granule was formed and stably in the sequencing batch airlift reactor with the seafoodprocessing wastewater at different organic loading rates (OLR) and nitrogen loading rates (NLR). At the N/COD ratio of 0.1, the COD removal efficiency was ranging from 94 to 96 % for OLR of 2.6 – 7.2 kg COD/m3 .d. The TKN removal efficiency was 93, 94 and 79 %, respectively. At the varied N/COD ratios, the TKN removal efficiency was approximately 95 % for the NLR of 0.3 and 0.6 kg N/m3 .d (N/COD of 0.1-0.2). The TKN removal efficiency reduced to 66% at the NLR of 0.9 kg N/m3 .d. In general, nitrification process occurred completely at the OLR less than 4.8 kg COD/m3 .d and the NLR less than 0.6 kg N/m3 .d. The simultaneous organic and nitrogen removal was effective at the OLR of 2.6-4.8 kg COD/m3 .d and the NLRs of 0.3 - 0.6 kg N/m3 .d.