Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 3, Pages 2219-2227Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.09.121
Keywords
Anaerobic digestion; Slaughterhouse waste; Lipids-proteins; 16S rRNA; Eubacterial-archaeal
Funding
- Spanish Ministry of Science and Innovation [ENE2004-00724/ALT, ENE2007-65850]
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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 L-CH4, kg(COD)(-1)) making them interesting substrates for the anaerobic digestion process. However, when increasing substrate concentrations in consecutive batch tests, up to 15 g(COD) 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, 165 rRNA gene-based DGGE results showed an enrichment of specialized microbial populations, such as beta-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. (C) 2010 Elsevier Ltd. All rights reserved.
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