Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 63, Issue 3, Pages 260-266Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2008.10.001
Keywords
Anaerobic digestion; Humic substances; Organic matter; Stability; Maturity
Funding
- French National Agency for Research and Technology (ANRT)
- Association for the Environment and Security in Aquitaine (APESA)
- French National Agency of Waste and Energy (ADEME)
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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 g(-1) C-org after 49 days as compared to 17.6 g CO2-C 100 g(-1) C-org. 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. (C) 2008 Elsevier Ltd. All rights reserved.
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