title: Co-digestion of bovine slaughterhouse wastes, cow manure, various crops and municipal solid waste at thermophilic conditions: a comparison with specific case running at mesophilic conditions.
abstract: A co-digestion process was evaluated when mixing different ratios of agro-industrial residues, i.e. bovine slaughterhouse waste (SB); cow manure (M); various crop residues (VC); and municipal solid waste (MSW) by anaerobic batch digestion under thermophilic conditions (55 °C). A selected study case at mesophilic condition (37 °C) was also investigated. The performance of the co-digestion was evaluated by kinetics (k(0)). The best kinetic results were obtained under thermophilic operation when a mixture of 22% w/w SB, 22% w/w M, 45% w/w VC and 11% w/w MSW was co-digested, which showed a proper combination of high values in r(s)CH(4) and k(0) (0.066 Nm(3)CH(4)/kgVS*d, 0.336 d(-1)) during the anaerobic process. The effect of temperature on methane yield (Y(CH4)), specific methane rate (r(s)CH(4)) and k(0) was also analyzed for a specific study case; there a mixture of 25% w/w of SB, 37.5% w/w of M, 37.5% of VC and 0% of MSW was used. Response variables were severely affected by mesophilic conditions, diminishing to at least 45% of the thermophilic values obtained for a similar mixture. The effect of temperature suggested that thermophilic conditions are suitable to treat these residues.
authors: Process Engineering Centre, High Technical Institute José Antonio Echeverría, Havana, Cuba. jhosane.pages_diaz@hb.se
authors: J
authors: J
authors: Pagés-Díaz
authors: I
authors: I
authors: Sárvári-Horváth
authors: J
authors: J
authors: Pérez-Olmo
authors: I
authors: I
authors: Pereda-Reyes
mesh_terms: D000003:Abattoirs; D000693:Anaerobiosis; D000818:Animals; D002417:Cattle; D018556:Crops, Agricultural; D007220:Industrial Waste; D008372:Manure; D012037:Refuse Disposal; D013696:Temperature
chemical_list: D007220:Industrial Waste; D008372:Manure