title: Simulating the degradation of odor precursors in primary and waste-activated sludge during anaerobic digestion.
abstract: Degradation of known odor precursors in sludge during anaerobic digestion was systematically studied and simulated using the Anaerobic Digestion Model Number 1 (ADM1). The degradation of various protein fractions (particulate, soluble, and bound), volatile fatty acids (VFAs), lipids, and amino acids of primary sludge (PS) and waste-activated sludge (WAS) were monitored during anaerobic digestion. The degradation kinetic constants of the odor precursors namely, protein, lipid, and VFAs were determined. Relationships between degradations of protein fractions and volatile suspended solid were established; a strong relationship between bound protein, a major odor precursor, and volatile suspended solid degradation was found. No statistically significant difference in bound protein reduction was observed between PS and WAS. ADM1 was successfully used to simulate the lab scale continuous anaerobic digestion; model results with optimized parameters showed good agreement with the experimental data for methane production and several other sludge parameters including odor precursors such as lipids, VFAs, and proteins.
authors.affiliation: Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A5B9, Canada.
authors.forename: Saad
authors.initials: S
authors.lastname: Aldin
authors.forename: Fuzhou
authors.initials: F
authors.lastname: Tu
authors.forename: George
authors.initials: G
authors.lastname: Nakhla
authors.forename: Madhumita B
authors.initials: MB
authors.lastname: Ray
mesh_terms: D000596:Amino Acids / Q000737:chemistry / Q000378:metabolism; D000693:Anaerobiosis; D019149:Bioreactors; D003198:Computer Simulation; D005232:Fatty Acids, Volatile / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D050356:Lipid Metabolism; D008055:Lipids / Q000737:chemistry; D009812:Odorants; D011506:Proteins / Q000737:chemistry / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D000596:Amino Acids; D005232:Fatty Acids, Volatile; D008055:Lipids; D011506:Proteins; D012722:Sewage