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Updated: Feb 4, 2026

Preparation of High-Quality Fermented Fish Product
Published on: August 23, 2019
Valorisation of digestate from biowaste through solid-state fermentation to obtain value added bioproducts: A first
Alejandra Cerda1, Laura Mejias2, Paula Rodríguez1
1GICOM Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Edifici Q, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Abstract:
Digestate from biowaste was assessed as a potential source of bioproducts of commercial and industrial interest through solid-state fermentation. The targeted bioproducts were hydrolytic enzymes (cellulases and proteases from autochthonous microbiome), biosurfactants (sophorolipids produced from Starmella bombicola) and biopesticides (produced from Bacillus thuringiensis). Low cellulase production was observed within the range of 0.5-1.5 FPU g-1 DM while protease production showed two discrete peaks of 66 ± 8 and 65 ± 3 U g-1 DM at 3.5 and 48 h, respectively. Low sophorolipids production was also obtained, with a maximum yield of 0.02 g g-1 DM using hygienised digestate supplemented with external sugar and fat sources. Biopesticides produced by B. thuringiensis were successfully at 72 h of operation, reaching a maximum spore production of 8.15 ± 0.04 (107) CFU g-1 DM and 2.85 ± 0.22 (107) CFU g-1 DM using sterile and hygienised digestate, respectively. These biopesticides could contribute to the substitution of chemically produced pesticides, moving towards a sustainable digestate management in a circular economy scheme.
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