title: Anaerobic biodegradability of Category 2 animal by-products: methane potential and inoculum source.
abstract: Category 2 animal by-products that need to be sterilized with steam pressure according Regulation (EC) 1774/2002 are studied. In this work, 2 sets of experiments were performed in mesophilic conditions: (i) biomethane potential determination testing 0.5%, 2.0% and 5.0% total solids (TS), using sludge from the anaerobic digester of a wastewater treatment plant as inoculum; (ii) biodegradability tests at a constant TS concentration of 2.0% and different inoculum sources (digested sludge from a wastewater treatment plant; granular sludge from an upflow anaerobic sludge blanket reactor; leachate from a municipal solid waste landfill; and sludge from the slaughterhouse wastewater treatment anaerobic lagoon) to select the more adapted inoculum to the substrate in study. The higher specific methane production was of 317 mL CH(4)g(-1) VS(substrate) for 2.0% TS. The digested sludge from the wastewater treatment plant led to the lowest lag-phase period and higher methane potential rate.
authors.affiliation: LSRE-Laboratory of Separation and Reaction Engineering-Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal.
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Pozdniakova
authors.forename: José C
authors.initials: JC
authors.lastname: Costa
authors.forename: Ricardo J
authors.initials: RJ
authors.lastname: Santos
authors.forename: M M
authors.initials: MM
authors.lastname: Alves
authors.forename: Rui A R
authors.initials: RA
authors.lastname: Boaventura
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D008697:Methane / Q000378:metabolism*
chemical_list: D008697:Methane