Details

Autor(en) / Beteiligte

• Maynaud, Géraldine
• Druilhe, Céline
• Daumoin, Mylène
• Jimenez, Julie
• Patureau, Dominique
• Torrijos, Michel
• Pourcher, Anne-Marie
• Wéry, Nathalie

Titel

Characterisation of the biodegradability of post-treated digestates via the chemical accessibility and complexity of organic matter

Ist Teil von

• Bioresource technology, 2017-05, Vol.231, p.65-74

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2017

Quelle

MEDLINE

Beschreibungen/Notizen

• [Display omitted] •Aerobic and anaerobic biodegradabilities are linearly correlated.•Biodegradability is mostly anti-correlated with the complexity of organic matter.•Post-treatments have a significant effect on biodegradability and complexity.•Kinetics of respirometric activity present multi-peaks for certain digestates. The stability of digestate organic matter is a key parameter for its use in agriculture. Here, the organic matter stability was compared between 14 post-treated digestates and the relationship between organic matter complexity and biodegradability was highlighted. Respirometric activity and CH4 yields in batch tests showed a positive linear correlation between both types of biodegradability (R2=0.8). The accessibility and complexity of organic matter were assessed using chemical extractions combined with fluorescence spectroscopy, and biodegradability was mostly anti-correlated with complexity of organic matter. Post-treatments presented a significant effect on the biodegradability and complexity of organic matter. Biodegradability was low for composted digestates which comprised slowly accessible complex molecules. Inversely, solid fractions obtained after phase separation contained a substantial part of remaining biodegradable organic matter with a significant easily accessible fraction comprising simpler molecules. Understanding the effect of post-treatment on the biodegradability of digestates should help to optimize their valorization.