title: Biochemical methane potential of raw and pre-treated meat-processing wastes.
abstract: Raw and pre-treated greaves and rinds, two meat-processing wastes, were assessed for biochemical methane potential (BMP). Combinations of temperature (25, 55, 70 and 120 °C), NaOH (0.3 g g(-1) waste volatile solids) and lipase from Candida rugosa (10 U g(-1) fat) were applied to promote wastes hydrolysis, and the effect on BMP was evaluated. COD solubilisation was higher (66% for greaves; 55% for rinds) when greaves were pre-treated with NaOH at 55 °C and lipase was added to rinds after autoclaving. Maximum fat hydrolysis (52-54%) resulted from NaOH addition, at 55 °C for greaves and 25 °C for rinds. BMP of raw greaves and rinds was 707±46 and 756±56 L CH4 (at standard temperature and pressure) kg(-1)VS, respectively. BMP of rinds improved 25% by exposure to 70 °C; all other strategies tested had no positive effect on BMP of both wastes, and anaerobic biodegradability was even reduced by the combined action of base and temperature.
authors.affiliation: Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. acavaleiro@deb.uminho.pt
authors.forename: A J
authors.initials: AJ
authors.lastname: Cavaleiro
authors.forename: T
authors.initials: T
authors.lastname: Ferreira
authors.forename: F
authors.initials: F
authors.lastname: Pereira
authors.forename: G
authors.initials: G
authors.lastname: Tommaso
authors.forename: M M
authors.initials: MM
authors.lastname: Alves
mesh_terms: D001673:Biodegradation, Environmental; D002175:Candida / Q000145:classification / Q000378:metabolism*; D005240:Feasibility Studies; D005511:Food Handling; D019649:Food Industry / Q000379:methods*; D007220:Industrial Waste / Q000517:prevention & control*; D008460:Meat / Q000382:microbiology*; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D013045:Species Specificity
chemical_list: D007220:Industrial Waste; D008697:Methane