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Waste Manag

Title:		Anaerobic digestion and co-digestion of slaughterhouse waste (SHW): influence of heat and pressure pre-treatment in biogas yield
Author(s):		Cuetos MJ; Gomez X; Otero M; Moran A;
Address:		"Institute of Natural Resources (IRENA), University of Leon, Avda. de Portugal 41, 24071 Leon, Spain. mj.cuetos@unileon.es"
Journal Title:		Waste Manag
Year:		2010
Volume:		20100221
Issue:		10
Page Number:		1780 - 1789
DOI:		10.1016/j.wasman.2010.01.034
ISSN/ISBN:		1879-2456 (Electronic) 0956-053X (Linking)
Abstract:		"Mesophilic anaerobic digestion (34+/-1 degrees C) of pre-treated (for 20 min at 133 degrees C, >3 bar) slaughterhouse waste and its co-digestion with the organic fraction of municipal solid waste (OFMSW) have been assessed. Semi-continuously-fed digesters worked with a hydraulic retention time (HRT) of 36 d and organic loading rates (OLR) of 1.2 and 2.6 kg VS(feed)/m(3)d for digestion and co-digestion, respectively, with a previous acclimatization period in all cases. It was not possible to carry out an efficient treatment of hygienized waste, even less so when OFMSW was added as co-substrate. These digesters presented volatile fatty acids (VFA), long chain fatty acids (LCFA) and fats accumulation, leading to instability and inhibition of the degradation process. The aim of applying a heat and pressure pre-treatment to promote splitting of complex lipids and nitrogen-rich waste into simpler and more biodegradable constituents and to enhance biogas production was not successful. These results indicate that the temperature and the high pressure of the pre-treatment applied favoured the formation of compounds that are refractory to anaerobic digestion. The pre-treated slaughterhouse wastes and the final products of these systems were analyzed by FTIR and TGA. These tools verified the existence of complex nitrogen-containing polymers in the final effluents, confirming the formation of refractory compounds during pre-treatment"
Keywords:		"*Abattoirs Animals Bacteria, Anaerobic/*metabolism Fatty Acids/metabolism *Hot Temperature Mass Spectrometry Methane/*biosynthesis Poultry *Pressure Refuse Disposal/*methods Spectrophotometry, Infrared Spectroscopy, Fourier Transform Infrared Thermogravim;"
Notes:		"MedlineCuetos, M J Gomez, X Otero, M Moran, A eng Research Support, Non-U.S. Gov't 2010/02/24 Waste Manag. 2010 Oct; 30(10):1780-9. doi: 10.1016/j.wasman.2010.01.034. Epub 2010 Feb 21"