Anaerobic batch degradation of solid poultry slaughterhouse waste

• Published in: Water Science & Technology Vol. 41; no. 3; pp. 33 - 41
• Main Authors: Salminen, E, Rintala, J, Lokshina, L Y, Vavilin, V A
• Format: Journal Article Conference Proceeding
• Language: English
• Published: England IWA Publishing 01.01.2000
• Subjects: Abattoirs; Ammonia; Ammonification; Animals; Bacteria; Bacteria, Anaerobic - metabolism; Biodegradation, Environmental; Biomass; Carbon dioxide; Computer Simulation; Degradation; Dynamics; Environmental impact; Fatty acids; Fatty Acids, Nonesterified - analysis; Fatty Acids, Volatile - analysis; Hydrogen; Incubation period; Inoculum; Lipids; Methane; Methane - analysis; Microorganisms; Modelling; Models, Biological; Palmitic acid; Poultry; Poultry - metabolism; Propionic acid; Proteins; Ratios; Refuse Disposal - methods; Sensors; Solid wastes
• ISBN: 9781900222266; 1900222264
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2000.0053

We studied anaerobic batch degradation of solid poultry slaughterhouse wastes with different initial waste and inoculum concentrations and waste-to-inoculum ratios and simulated the dynamics of the process with a new generation model. Our modelling results suggest that inhibited propionate degradation by long-chain fatty acids (LCFA) and inhibited hydrolysis by a high propionate concentration constituted the rate-limiting step in the waste degradation. Palmitate was the most abundant LCFA in the assays. Within 27 days of incubation, up to 0.55 to 0.67 m3 of methane (STP)/kg VS added was produced under the studied conditions. Lower waste-to-inoculum ratios exhibited a faster onset and rate of specific methane production. In all the assays, ammonification occurred within 3 to 6 days and accounted for 50 to 60% of total nitrogen.