Optimisation of sugar and solid biofuel co-production from almond tree prunings by acid pretreatment and enzymatic hydrolysis

  1. Cuevas-Aranda, Manuel 1
  2. Martínez-Cartas, Mª Lourdes 1
  3. Mnasser, Fahd 1
  4. Karim, Adnan Asad 1
  5. Sánchez, Sebastián 1
  1. 1 Department of Chemical, Environmental and Materials Engineering, University of Jaén, Avda. de La Universidad s/n, 23700, Linares, Spain
Revista:
Bioresources and Bioprocessing

ISSN: 2197-4365

Año de publicación: 2024

Volumen: 11

Número: 1

Tipo: Artículo

DOI: 10.1186/S40643-024-00743-X GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Bioresources and Bioprocessing

Objetivos de desarrollo sostenible

Resumen

Almond pruning biomass is an important agricultural residue that has been scarcely studied for the co-production of sugars and solid biofuels. In this work, the production of monosaccharides from almond prunings was optimised by a two-step process scheme: pretreatment with dilute sulphuric acid (0.025 M, at 185.9–214.1 ℃ for 0.8–9.2 min) followed by enzyme saccharification of the pretreated cellulose. The application of a response surface methodology enabled the mathematical modelling of the process, establishing pretreatment conditions to maximise both the amount of sugar in the acid prehydrolysate (23.4 kg/100 kg raw material, at 195.7 ℃ for 3.5 min) and the enzymatic digestibility of the pretreated cellulose (45.4%, at 210.0 ℃ for 8.0 min). The highest overall sugar yield (36.8 kg/100 kg raw material, equivalent to 64.3% of all sugars in the feedstock) was obtained with a pretreatment carried out at 197.0 ℃ for 4.0 min. Under these conditions, moreover, the final solids showed better properties for thermochemical utilisation (22.0 MJ/kg heating value, 0.87% ash content, and 72.1 mg/g moisture adsorption capacity) compared to those of the original prunings.

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