title: Valorization of soy waste through SSF for the production of compost enriched with Bacillus thuringiensis with biopesticide properties.
abstract: There is a growing generation of biodegradable wastes from different human activities from industrial to agricultural including home and recreational activities. On the other hand, agricultural and horticultural activities require significant amounts of organic amendments and pesticides. In this framework, the present study evaluates the viability of soy fiber residue valorization as organic soil amendment with biopesticide properties through aerobic solid-state fermentation (SSF) in the presence of Bacillus thuringiensis (Bt). The experiments were performed first under sterile and non-sterile conditions at lab scale using 115 g of sample and controlled temperature (30 °C). Bt growth was successful in sterile conditions, obtaining 6.2 × 10(11) CFU g(-1) DM and 8.6 × 10(10) spores g(-1) DM after 6 days. Bt survived on solid culture under non-sterile conditions (3.8 × 10(9) CFU g(-1) DM and 1.3 × 10(8) spores g(-1) DM). Further, the valorization process was scaled-up to 10 L reactors (2300 g) under non-sterile conditions obtaining a final stabilized material with viable Bt cells and spores (9.5 × 10(7) CFU g(-1) DM and 1.1 × 10(8) spores g(-1) DM in average) after 9 days of SSF. These results confirm the possibility of managing biodegradable wastes by their transformation to a waste derived soil amendment with enhanced biopesticide effect, in comparison to traditional compost using a valuable and low-cost technique (SSF).
authors.affiliation: Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain.
authors.forename: Cindy
authors.initials: C
authors.lastname: Ballardo
authors.affiliation: Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain.
authors.forename: Juliana
authors.initials: J
authors.lastname: Abraham
authors.affiliation: Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain.
authors.forename: Raquel
authors.initials: R
authors.lastname: Barrena
authors.affiliation: Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain. Electronic address: adriana.artola@uab.cat.
authors.forename: Adriana
authors.initials: A
authors.lastname: Artola
authors.affiliation: Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain.
authors.forename: Teresa
authors.initials: T
authors.lastname: Gea
authors.affiliation: Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain.
authors.forename: Antoni
authors.initials: A
authors.lastname: Sánchez
mesh_terms: D000383:Agriculture / Q000379:methods; D001413:Bacillus thuringiensis; D001673:Biodegradation, Environmental; D061046:Biological Control Agents; D005285:Fermentation; D006801:Humans; D010572:Pest Control, Biological; D012987:Soil; D013025:Glycine max; D018505:Waste Management / Q000379:methods*
chemical_list: D061046:Biological Control Agents; D012987:Soil
keywords: Bacillus thuringiensis; Compost; Soil amendment; Solid state fermentation; Soy fiber residues; Waste valorization