Characterisation of the biodegradability of post-treated digestates via the chemical accessibility and complexity of organic matter
Maynaud, Géraldine | Druilhe, Céline | Daumoin, Mylène | Jimenez, Julie | Steyer, Dominique | Torrijos, Michel | Pourcher, Anne-Marie | Wéry, Nathalie | Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE) ; Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Optimisation des procédés en Agriculture, Agroalimentaire et Environnement (UR OPAALE) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Université Bretagne Loire (UBL) | ADEME grant number 1306C0032
[Departement_IRSTEA]Ecotechnologies [TR1_IRSTEA]TED
Показать больше [+] Меньше [-]Английский. 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.
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