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http://hdl.handle.net/10773/28285
Title: | Anaerobic digestion and co-digestion of slaughterhouse waste (SHW): influence of heat and pressure pre-treatment in biogas yield |
Author: | Cuetos, M. J. Gómez, X. Otero, M. Morán, A. |
Issue Date: | Oct-2010 |
Publisher: | Elsevier |
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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/28285 |
DOI: | 10.1016/j.wasman.2010.01.034 |
ISSN: | 0956-053X |
Appears in Collections: | CESAM - Artigos DQ - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Cuetos et al. - 2010 - Anaerobic digestion and co-digestion of slaughterh.pdf | 396.59 kB | Adobe PDF |
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