Characterization of typical household food wastes from disposers: fractionation of constituents and implications for resource recovery at wastewater treatment.
Food wastes with typical US food composition were analyzed to characterize different constituents in both particulate and soluble phases i.e., solids, chemical oxygen demand (COD), 5-day biochemical oxygen demand (BOD), nitrogen (N), phosphorus (P). Relationships between various pollutants were also investigated using 50 samples. One gram of dry food waste generated 1.21 g COD, 0.58 g BOD5, 0.36 g Total SS, 0.025 g Total N, and 0.013 g Total P. Distribution of constituents between particulate and aqueous phases indicated that 40% of COD and 30% of nitrogen were present in soluble form. Relative mass ratios of COD and nitrogen to solids were three to five times higher in particulates than in aqueous phase. However, COD/N ratios were higher in aqueous form than particulates at 63:1 versus 42:1. Detailed relationships between parameters showed that COD, nitrogen, and phosphorus in particulates are 200%, 3.6%, and 3.5% of the volatile suspended solids.
Chemical and Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada.
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Kim
Civil and Environmental Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada.
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Chowdhury
Chemical and Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada; Civil and Environmental Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada. Electronic address: gnakhla@uwo.ca.
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Nakhla
InSinkErator, Emerson Commercial & Residential Solutions, 4700 21st Street, Racine, WI 53406-5031, United States.
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Keleman
D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D005591:Chemical Fractionation; D005502:Food; D009584:Nitrogen / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification; D012044:Regression Analysis; D012722:Sewage / Q000737:chemistry; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000295:instrumentation*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D056804:Biofuels; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
Characterization; Food waste disposer; Food wastes; Municipal wastewater