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Assessment of different mechanical treatments for improving the anaerobic biodegradability of residual raspberry extrudate

AuthorsTrujillo-Reyes, Ángeles CSIC ORCID ; Sinisgalli, Érika; Cubero-Cardoso, Juan CSIC ORCID ; Pérez Rubio, Ana Gracia CSIC ORCID ; Serrano Moral, Antonio CSIC ORCID ; Borja Padilla, Rafael CSIC ORCID ; Fermoso, Fernando G. CSIC ORCID
KeywordsAnaerobic digestion
Ellagic acid
Particle size distribution
Raspberry achenes
Issue Date15-Feb-2022
CitationWaste Management 139: 190-198 (2022)
AbstractMechanical treatments can be simple and feasible methods for enhancing the anaerobic digestion of lignocellulosic substrates. This work aims to relate the direct effect of five different mechanical treatments, i.e., variation in the size and number of particles, with the variations in the chemical composition and, subsequently, the effect over the anaerobic digestion of residual raspberry extrudate, which was used as a model substrate. A high variation in the number of particles and the particle size distribution was achieved depending on the mechanical treatment applied, reaching the highest number of particles for the treatments with knife mills and mortar (around 8000 particles per gram). The higher number of particles was related to higher solubilisation, including phenolic compounds and sugars. The combination of knife mills and mortar pretreatment, which presented the highest number of particles, resulted in a 66% more of polyphenols in comparison to the raw substrate. However, the presence of anthocyanins was higher in mechanical treatments with less effect. The enhancement of the anaerobic digestion was clearly related to the increment in the number of particles of small size after the mechanical treatments. The highest methane yield coefficient (236 ± 11 mL CH4/g volatile solids) was achieved for the raspberry extrudate treated with knife mills.
Description9 Páginas.-- 5 Figuras.-- 3 Tablas
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