Anaerobic digestion and co-digestion of slaughterhouse waste (SHW): Influence of heat and pressure pre-treatment in biogas yield |
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| Authors: | MJ Cuetos X Gómez M Otero A Morán |
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| Institution: | 1. Institute of Natural Resources (IRENA), University of León, Avda. de Portugal 41, 24071 León, Spain;2. Centre for Environment and Marine Studies (CESAM), Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;1. Centro de Estudio de Ingeniería de Procesos (CIPRO), Instituto Superior Politécnico José Antonio Echeverría (Cujae), 119 #11901 e/ Rotonda y Ciclovía, Marianao, Habana, Cuba;2. Swedish Center of Resource Recovery, University of Borås, SE 501 90 Borås, Sweden;1. Lodz University of Technology, Institute of Fermentation Technology and Microbiology, Wólczańska 171/173, 90-924 ?ód?, Poland;2. Lodz University of Technology, Faculty of Process and Environmental Engineering, Wólczańska 213, 90-924 ?ód?, Poland;1. Department of Mechanical Engineering of Agricultural Machinery, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran;3. Department of Chemical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran |
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| Abstract: | Mesophilic anaerobic digestion (34 ± 1 °C) of pre-treated (for 20 min at 133 °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 VSfeed/m3 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. |
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