'New tailor-made biopolymers produced from lignocellulosic sugars waste for highly demanding fire-resistant applications'

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

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 www.linkpops.net 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 rolex replica 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.

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

» Reference: Bioresource Technology, Volume 231

» Publication Date: 01/05/2017

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This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration