title: Nitrogen and phosphorus removal from an abattoir wastewater in a SBR with aerobic granular sludge.
abstract: The formation and performance of granular sludge was studied in an 8l sequencing batch reactor (SBR) treating an abattoir (slaughterhouse) wastewater. Influent concentrations averaged 1,520 mg l(-1) volatile suspended solids (VSS), 7,685 mg l(-1) Chemical oxygen demand (COD), 1,057 mg l(-1) total kjeldahl nitrogen (TKN), 217 mg l(-1) total P. The COD loading was 2.6 kgm(-3)d(-1). The SBR was seeded with flocculating sludge from a SBR with an 1h settle time, but granules developed within 4 days by reducing the settle time to 2 min. The SBR cycle also had 120 min mixed (anaerobic) fill, 220 min aerated react, and 18 min draw/idle. The granules had a mean diameter of 1.7 mm, a specific gravity of 1.035, a density of 62 g VSS l(-1), a zone settling velocity (ZSV) of 51 mh(-1), and a sludge volume index (SVI) of 22 ml g(-1). Without optimizing process conditions, removal of COD and P were over 98%, and removal of N and VSS were over 97%. Nitrification and denitrification occurred simultaneously during react. The results indicate that conventional SBRs treating wastewaters with flocculating sludge can be converted to granular SBRs by reducing the settle time.
authors.affiliation: Département de Géologie et de Génie Géologique, Université. Laval, Sainte-Foy, Que., Canada G1K 7P4. daniel.cassidy@ggl.ulacal.ca
authors.forename: D P
authors.initials: DP
authors.lastname: Cassidy
authors.forename: E
authors.initials: E
authors.lastname: Belia
mesh_terms: D000003:Abattoirs; D001420:Bacteria, Aerobic / Q000378:metabolism*; D019149:Bioreactors; D007220:Industrial Waste; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D010316:Particle Size; D010758:Phosphorus / Q000302:isolation & purification* / Q000378:metabolism; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods
chemical_list: D007220:Industrial Waste; D009573:Nitrites; D012722:Sewage; D010758:Phosphorus; D009584:Nitrogen