title: Co-digestion of different waste mixtures from agro-industrial activities: kinetic evaluation and synergetic effects.
abstract: Several wastes from agro-industrial activities were mixed in different ratios to evaluate the co-digestion process. Methane yield YCH4, specific methanogenic activity (SMA) and a kinetic parameter (k0) were determined. A second feeding was also performed to examine the recovery of bacterial activity after exhaustion. Mixture ratios of 1:1:1:1 and 1:3:4:0.5 (w/w) showed the best performance, with YCH4 of 664; 582 NmL CH4/gVSsubstrate, as well as SMA of 0.12; 0.13 gCODNmLCH4/gVSinoculum/d, respectively, during the digestion of the first feed. It was possible to relate synergetic effects with enhancement in YCH4 by up to 43%, compared with values calculated from YCH4 of the individual substrates. All batches started up the biogas production after an exhaustion period, when a second feed was added. However, long lag phases (up to 21 days) were observed due to stressed conditions caused by the substrate limitation prior to the second feed.
authors: Process Engineering Centre, High Technical Institute José Antonio Echeverría (CUJAE), 11901, 114 Street, Marianao, Havana, Cuba. jhosane@quimica.cujae.edu.cu
authors: Jhosané
authors: J
authors: Pagés Díaz
authors: Ileana
authors: I
authors: Pereda Reyes
authors: Magnus
authors: M
authors: Lundin
authors: Ilona
authors: I
authors: Sárvári Horváth
mesh_terms: D000383:Agriculture / Q000379:methods*; D000693:Anaerobiosis; D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism; D001673:Biodegradation, Environmental; D056804:Biofuels; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods; D002417:Cattle; D007700:Kinetics; D008372:Manure; D008697:Methane / Q000737:chemistry*; D012037:Refuse Disposal; D012722:Sewage / Q000382:microbiology
chemical_list: D056804:Biofuels; D008372:Manure; D012722:Sewage; D008697:Methane