Anaerobic digestion of animal by-products and slaughterhouse waste: main process limitations and microbial community interactions

Fresh pig/cattle slaughterhouse waste mixtures, with different lipid-protein ratios, were characterized and their anaerobic biodegradability assessed in batch tests. The resultant methane potentials were high (270–300 LCH4 kg 1 COD) making them interesting substrates for the anaerobic digestion proc...

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Bibliographic Details
Main Authors Palatsi Civit, Jordi, Viñas, Marc, Guivernau, Miriam, Fernández García, Belén, Flotats Ripoll, Xavier
Format Publication
LanguageEnglish
Published 01.02.2011
Subjects
Biologia
Ciències de la terra i de la vida
Digestió anaeròbia
Digestió anaeròbia Residus dels escorxadors Lípids-proteïnes
Enginyeria agroalimentària
Lipids
Proteins
Residus agrícoles
Àrees temàtiques de la UPC
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Summary:Fresh pig/cattle slaughterhouse waste mixtures, with different lipid-protein ratios, were characterized and their anaerobic biodegradability assessed in batch tests. The resultant methane potentials were high (270–300 LCH4 kg 1 COD) making them interesting substrates for the anaerobic digestion process. However, when increasing substrate concentrations in consecutive batch tests, up to 15 gCOD kg 1, a clear inhibitory process was monitored. Despite the reported severe inhibition, related to lipid content, the system was able to recover activity and successfully degrade the substrate. Furthermore, 16S rRNA gene-based DGGE results showed an enrichment of specialized microbial populations, such as b-oxidizing/proteolitic bacteria (Syntrophomonas sp., Coprothermobacter sp. and Anaerobaculum sp.), and syntrophic methanogens (Methanosarcina sp.). Consequently, the lipid concentration of substrate and the structure of the microbial community are the main limiting factors for a successful anaerobic treatment of fresh slaughterhouse waste.
ISSN:0960-8524
DOI:10.1016/j.biortech.2010.09.121