Valorization of soy waste through SSF for the production of compost enriched with B. thuringiensis with biopesticide properties
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 fra...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:196188 |
| Acceso en línea: | https://ddd.uab.cat/record/196188 https://dx.doi.org/urn:doi:10.1016/j.jenvman.2015.12.029 |
| Access Level: | acceso abierto |
| Palabra clave: | Waste valorization Soy fiber residues Bacillus thuringiensis Soil amendment Solid state fermentation Compost |
| Sumario: | 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 × 10¹¹ CFU g⁻¹ DM and 8.6 × 10¹⁰ spores g⁻¹ DM after 6 days. Bt survived on solid culture under non-sterile conditions (3.8 × 109 CFU g⁻¹ DM and 1.3 × 10⁸ 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 × 107 CFU g-1 DM and 1.1 × 108 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). |
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