Valorisation of digestate from biowaste through solid-state fermentation to obtain value added bioproducts: A first approach

Alejandra Cerda, Laura Mejias, Paula Rodríguez, Alejandra Rodríguez, Adriana Artola, Xavier Font, Teresa Gea, Antoni Sánchez, Raquel Barrena Gomez

Research output: Contribution to journalArticleResearch

12 Citations (Scopus)

Abstract

© 2018 Elsevier Ltd 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 (10 7 ) CFU g −1 DM and 2.85 ± 0.22 (10 7 ) 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.
Original languageEnglish
Pages (from-to)409-416
Number of pages8
JournalBioresource Technology
Volume271
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Biopesticide
  • Bioproducts
  • Digestate
  • Solid state fermentation
  • Valorisation
  • Endopeptidases/metabolism
  • Hydrolysis
  • Saccharomycetales/metabolism
  • Cellulase/metabolism
  • Bacillus thuringiensis/metabolism
  • Fermentation
  • BACILLUS-THURINGIENSIS
  • VALORIZATION
  • COFFEE HUSK
  • BENCH-SCALE
  • BIOPESTICIDE PROPERTIES
  • PROTEASE PRODUCTION
  • SUGARCANE BAGASSE
  • CELLULASE
  • AROMA COMPOUNDS
  • WASTE

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