title: Treatment of a slaughterhouse wastewater: effect of internal recycle rate on chemical oxygen demand, total Kjeldahl nitrogen and total phosphorus removal.
abstract: This study investigated the ability of an anaerobic/anoxic/oxic (A2/O) system to treat a slaughterhouse wastewater. The system employed two identical continuous-flow reactors (101 total liquid volume each) running in parallel with the main operational variable, being the internal recycle (IR) rate. The chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN) and total phosphorus (TP) performance was evaluated as the IR flowrate was increased from a Q of 151d(-1) to 4Q at a system hydraulic retention time of 16 h and a solids retention time of 10 d. The COD:TKN and COD:TP ratios were 8.2:1 and 54:1, which supported both nitrogen and phosphorus removal. For all IR multiples of Q, the COD removal was in excess of 90%. The TKN removal showed a modest improvement (a 4-5% increase, depending on the dissolved oxygen (DO)) as the IR doubled from Q to 2Q, but no further increase was observed at the 4Q IR rate. The TP removal reached its optimum (around 85%-89% (again depending on the DO)) at the 2Q rate.
authors.affiliation: Department of Sanitary Engineering, Mahidol University and Centre for Environmental Health, Toxicology and Management of Chemicals (ETM), Bangkok, Thailand.
authors.forename: P
authors.initials: P
authors.lastname: Fongsatitkul
authors.forename: D G
authors.initials: DG
authors.lastname: Wareham
authors.forename: P
authors.initials: P
authors.lastname: Elefsiniotis
authors.forename: P
authors.initials: P
authors.lastname: Charoensuk
mesh_terms: D000003:Abattoirs; D057919:Biological Oxygen Demand Analysis; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D010758:Phosphorus; D009584:Nitrogen