Enzymatic hydrolysis of the organic fraction of municipal solid waste: Optimization and valorization of the solid fraction for Bacillus thuringiensis biopesticide production through solid-state fermentation

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Abstract

To reach a more sustainable society, the implementation of a circular economy perspective in municipal waste management becomes essential. In this work, the enzymatic hydrolysis of source-separated organic fraction of municipal solid waste (OFMSW) has been optimized as a sugar-releasing step. A liquid sugar concentrate, with a maximum reducing sugar concentration of 50.56 g L-1, and a solid hydrolyzed fraction were obtained. The effect of the harshness of the hydrolysis conditions was evaluated on the performance of the resulting solid fraction as a substrate for Bacillus thuringiensis biopesticide production through solid-state fermentation. A production of 3.9 x 10(8) viable cells g(-1) dry matter with a 33% sporulation ratio was achieved for milder hydrolysis conditions, highlighting the potential of the solid fraction of hydrolysis as a substrate of SSF processes. The proposed valorization pathway for the OFMSW results in a sugar concentrate with potential for fermentative processes and a fermented solid containing biopesticides from Bacillus thuringiensis.

Translated title of the contributionHidrólisis enzimática de la fracción orgánica de residuos sólidos urbanos: Optimización de la fracción sólida para la producción de biopesticida de Bacillus thuringiensis por fermentación en estado sólido
Original languageEnglish
Pages (from-to)304-311
Number of pages8
JournalWaste Management
Volume137
DOIs
Publication statusPublished - 1 Jan 2022

Keywords

  • Bacillus thuringiensis
  • Biopesticide
  • Enzymatic hydrolysis
  • OFMSW
  • Solid-State Fermentation
  • Hydrolysis
  • Biological Control Agents
  • Solid Waste/analysis
  • Bioreactors
  • Fermentation
  • FOOD WASTE
  • MANAGEMENT
  • VALORISATION
  • PRETREATMENT
  • DIGESTATE
  • METHANE PRODUCTION
  • BIOWASTE

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