Effect of leaching and fungal attacks during storage on chemical properties of raw and torrefied biomasses

De Freitas Homem De Faria Bruno, Lanvin Charline, Valette Jérémy, Rousset Patrick, De Cassia Oliveira Carneiro Angelica, Caldeira-Pires Armando, Candelier Kévin. 2020. Effect of leaching and fungal attacks during storage on chemical properties of raw and torrefied biomasses. Waste and Biomass Valorization, 19 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Abstract : Coffee husk, eucalyptus, and pine residues were torrefied at 290 °C in a screw reactor, during 5, 10, 15 or 20 min. The effects of feedstock type and torrefaction process parameters (holding time) on their energy characteristics were investigated. Raw and torrefied biomasses were then submitted successively to leaching and to white and brown rot fungi, to mimic storage conditions. Mass loss after leaching step, water content and weight loss due to fungal deterioration after 2, 4, 8, 12, 16 weeks were recorded. The chemical composition and high heating value (HHV) of the torrefied samples were measured to determine the alterations compared to raw biomass during their storage. Increasing torrefaction residence time improves the decay resistance of the biomasses. Variation of carbon content (%wt., dry basis) and HHV (kJ/kg, dry basis) were observed during native and torrefied biomasses fungal degradations. Carbon contents and HHV values of raw and torrefied biomasses decreased during Trametes versicolor exposure [49.65% > C > 44.07% and 19.71 kJ/kg > HHV > 17.19 kJ/kg, results from results from all tests combined.], whereas they increased during exposure to Coniophora puteana [46.15% < C < 52.70% and 17.43 kJ/kg < HHV < 20.74 kJ/kg]. Severe torrefaction is therefore a good way to improve coffee husk, eucalyptus, and pine energy properties while limiting loss of their energy properties during storage.

Mots-clés Agrovoc : Biomasse, Torréfaction, Propriété physicochimique, Stockage, Lessivage du sol, Contamination biologique, Résidu de récolte, Coffea, Eucalyptus, Pinus

Mots-clés libres : Biomass, Chemical and energy properties, Storage, Torrefaction

Classification Agris : Q60 - Processing of non-food or non-feed agricultural products

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Auteurs et affiliations

  • De Freitas Homem De Faria Bruno, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Lanvin Charline, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Valette Jérémy, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Rousset Patrick, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • De Cassia Oliveira Carneiro Angelica, UFV (BRA)
  • Caldeira-Pires Armando, UNB [Universidade de Brasilia] (BRA)
  • Candelier Kévin, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9328-8511 - auteur correspondant

Source : Cirad-Agritrop (

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