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Waste Manag

Title:		Anaerobic digestion of autoclaved and untreated food waste
Author(s):		Tampio E; Ervasti S; Paavola T; Heaven S; Banks C; Rintala J;
Address:		"Bioenergy and Environment, MTT Agrifood Research Finland, FI-31600 Jokioinen, Finland. Electronic address: elina.tampio@mtt.fi. Bioenergy and Environment, MTT Agrifood Research Finland, FI-31600 Jokioinen, Finland. University of Southampton, Faculty of Engineering and the Environment, Southampton SO17 1BJ, UK"
Journal Title:		Waste Manag
Year:		2014
Volume:		20131115
Issue:		2
Page Number:		370 - 377
DOI:		10.1016/j.wasman.2013.10.024
ISSN/ISBN:		1879-2456 (Electronic) 0956-053X (Linking)
Abstract:		"Anaerobic digestion of autoclaved (160 degrees C, 6.2 bar) and untreated source segregated food waste (FW) was compared over 473 days in semi-continuously fed mesophilic reactors with trace elements supplementation, at organic loading rates (OLRs) of 2, 3, 4 and 6 kg volatile solids(VS)/m(3)d. Methane yields at all OLR were 5-10% higher for untreated FW (maximum 0.483+/-0.013 m(3) CH4/kg VS at 3 kg VS/m(3) d) than autoclaved FW (maximum 0.439+/-0.020 m(3) CH4/kg VS at 4 kg VS/m(3) d). The residual methane potential of both digestates at all OLRs was less than 0.110 m(3) CH4/kg VS, indicating efficient methanation in all cases. Use of acclimated inoculum allowed very rapid increases in OLR. Reactors fed on autoclaved FW showed lower ammonium and hydrogen sulphide concentrations, probably due to reduced protein hydrolysis as a result of formation of Maillard compounds. In the current study this reduced biodegradability appears to outweigh any benefit due to thermal hydrolysis of ligno-cellulosic components"
Keywords:		Anaerobiosis *Bioreactors Digestion/*physiology *Food Methane/*biosynthesis Pressure Refuse Disposal/*methods Steam Waste Products/*analysis Anaerobic digestion Autoclave treatment Food waste Nitrogen Organic loading rate;
Notes:		"MedlineTampio, Elina Ervasti, Satu Paavola, Teija Heaven, Sonia Banks, Charles Rintala, Jukka eng Research Support, Non-U.S. Gov't 2013/11/19 Waste Manag. 2014 Feb; 34(2):370-7. doi: 10.1016/j.wasman.2013.10.024. Epub 2013 Nov 15"