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

Maynaud, G. ; Druilhe, C. ; Daumoin, M. ; Jimenez, J. ; Patureau, D. ; Torrijos, M ; Pourcher, A.M. ; Wéry, N.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
INRA LBE NARBONNE FRA ; IRSTEA RENNES UR OPAALE FRA ; IRSTEA RENNES UR OPAALE FRA ; INRA LBE NARBONNE FRA ; INRA LBE NARBONNE FRA ; INRA LBE NARBONNE FRA ; IRSTEA RENNES UR OPAALE FRA ; INRA LBE NARBONNE FRA
Année
2017
Résumé / Abstract
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 CH4yields 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. © 2017 Elsevier Ltd
Source
Bioresource Technology, vol. 231, p. 65 - 74
Editeur
Elsevier Ltd

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