Vinasse: from a residue to a high added value biopolymer

Abstract

This work aimed to study the feasibility of using vinasse for polyhydroxybutyrate (PHB) production by Bacillus megaterium. To optimize the culture medium, a Box–Behnken design was employed considering carbon (C), nitrogen (N), and phosphorus (Ph) concentrations as independent variables and PHB productivity as the response variable. The productivity decreased when C or N were increased, probably due to the presence of phenolic compounds and the limitation of N for the production of PHB by Bacillus sp. bacteria. An additional experimental design to optimize the C/N ratio and growing conditions (fermentation time and temperature) was carried out. Fermentation time had a statistically significant effect on PHB productivity reaching 10.6 mg/L h. On the other hand, the variability in physicochemical properties of vinasse samples led to significant differences in PHB productivity. Lower productivity values were obtained when vinasse had higher values of DBO. Therefore, biopolymers production from vinasse is a feasible alternative to valorize this bioethanol by-product.

Keywords

Vinasse / Polyhydroxybutyrate (PHB) / Bacillus megaterium / Microbial fermentation / Culture medium optimization

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Funding

Consejo Nacional de Investigaciones Científicas y Técnicas(PIP 112-201501-00127)

Agencia Nacional de Promoción Científica y Tecnológica(PICT-2014-2410)

Universidad Nacional del Sur(PGI 24/M154)