title: Treatment of food industry waste by bench-scale upflow anaerobic sludge blanket-anoxic-aerobic system.
abstract: An upflow anaerobic sludge blanket (UASB)-anoxicaerobic system was used for treatment of tomato and bean processing wastewater. At various hydraulic retention times, ranging from 0.7 to 5 days, excellent removal of chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), ammonia-nitrogen (NH4-N), and total Kjeldahl nitrogen was achieved with final effluent BOD/TSS/NH4N concentrations of less than 15/15/1 mg/L. Biogas yield in the UASB reactor varied from 0.33 to 0.44 m3/kgCODremoved. The kinetics of anaerobic treatment were investigated. The yield coefficient was 0.03 gVSS/gCOD; maximum specific growth rate was 0.24 day(-1); Monod half velocity constant was 135 mgCOD/L; and specific substrate utilization rate was 3.25 gCOD/gVSS x d. Nitrification and denitrification kinetics were studied in batch experiments, and the rates were comparable with those in the continuous flow system.
authors.affiliation: Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada.
authors.forename: Alpesh
authors.initials: A
authors.lastname: Gohil
authors.forename: George
authors.initials: G
authors.lastname: Nakhla
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors; D019649:Food Industry / Q000379:methods*; D007220:Industrial Waste; D010100:Oxygen / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D007220:Industrial Waste; D012722:Sewage; D010100:Oxygen