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Impact of anaerobic digestion on organic matter quality in pig slurry

Marcato, Claire-Emmanuelle and Mohtar, Rabi and Revel, Jean-Claude and Pouech, Philippe and Hafidi, Mohamed and Guiresse, Maritxu Impact of anaerobic digestion on organic matter quality in pig slurry. (2009) International Biodeterioration & Biodegradation, vol. 6 (n° 3). pp. 260-266. ISSN 0964-8305

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Official URL: http://dx.doi.org/10.1016/j.ibiod.2008.10.001

Abstract

Changes in pig slurry organic matter (OM) during anaerobic digestion (AD) were studied in a reactor to characterize OM evolution through AD. OM maturity and stability were evaluated using different biological and physico-chemical methods. Germination and growth chamber experiments revealed a higher maturity of digested slurry (DS) than raw slurry (RS). Soil incubations showed that DS was more stable than RS with a C-mineralization of 12.0 g CO2-C 100 g1 Corg after 49 days as compared to 17.6 g CO2- C100 g1 Corg. Biochemical fractionation showed a relative increase in stable compounds such as hemicellulose-like and lignin-like molecules. Fourier-transform infrared spectroscopy showed some changes in the chemical structures of OM with a reduction in the aliphatic chain, lipid and polysaccharide levels. A comparison between the evolution of OM during AD and the first weeks of a composting process showed almost identical changes. Finally a theoretical method called Fictitious Atomic-group Separation was applied to the elemental compositions of RS and DS. DS was less humified than RS and presented the properties of a fulvic acid, indicating that the observed stability in DS was mainly due to the biodegradation of the most labile compounds

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at International Biodeterioration & Biodegradation website : http://www.sciencedirect.com/science/journal/09648305
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Purdue University (USA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > University of Cadi Ayyad - UCAM (MOROCCO)
Other partners > Association Pour l’Environnement et la Sécurité en Aquitaine - APESA (FRANCE)
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Deposited By: Florence Amor

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