title: Study of thermal pre-treatment on anaerobic digestion of slaughterhouse waste by TGA-MS and FTIR spectroscopy.
abstract: Thermogravimetric analysis coupled to mass spectrometry (TGA-MS) and Fourier-transform infrared spectroscopy (FTIR) were used to describe the effect of pasteurization as a hygienic pre-treatment of animal by-products over biogas production. Piggery and poultry meat wastes were used as substrates for assessing the anaerobic digestion under batch conditions at mesophilic range. Poultry waste was characterized by high protein and carbohydrate content, while piggery waste presented a major fraction of fat and lower carbohydrate content. Results from anaerobic digestion tests showed a lower methane yield for the pre-treated poultry sample. TGA-MS and FTIR spectroscopy allowed the qualitative identification of recalcitrant nitrogen-containing compounds in the pre-treated poultry sample, produced by Maillard reactions. In the case of piggery waste, the recalcitrant compounds were not detected and its biodegradability test reported higher methane yield and production rates. TGA-MS and FTIR spectroscopy were demonstrated to be useful tools for explaining results obtained by anaerobic biodegradability test and in describing the presence of inhibitory problems.
authors.affiliation: 1Leibniz Institute for Agricultural Engineering Potsdam-Bornim, Potsdam, Germany.
authors.forename: Ángela
authors.initials: Á
authors.lastname: Rodríguez-Abalde
authors.forename: Xiomar
authors.initials: X
authors.lastname: Gómez
authors.forename: Daniel
authors.initials: D
authors.lastname: Blanco
authors.forename: María José
authors.initials: MJ
authors.lastname: Cuetos
authors.forename: Belén
authors.initials: B
authors.lastname: Fernández
authors.forename: Xavier
authors.initials: X
authors.lastname: Flotats
mesh_terms: D000003:Abattoirs; D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis; D007220:Industrial Waste; D013058:Mass Spectrometry; D008460:Meat; D008697:Methane / Q000032:analysis; D061352:Pasteurization; D011200:Poultry; D017550:Spectroscopy, Fourier Transform Infrared; D013552:Swine; D013818:Thermogravimetry; D018505:Waste Management / Q000379:methods*
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008697:Methane
keywords: Anaerobic digestion; FTIR; pasteurization; slaughterhouse waste; thermogravimetric analysis