Upgrading of organic waste: production of the copolymer poly-3-hydroxybutyrate-co-valerate by Ralstonia eutrophus with organic waste as sole carbon source
✍ Scribed by Klaassien J Ganzeveld; Annechien van Hagen; Martin H van Agteren; Wim de Koning; Anton J.M Schoot Uiterkamp
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 99 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0959-6526
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✦ Synopsis
Two types of fermented organic waste (trade and industry waste and fruit and vegetable waste) were successfully used as a sole carbon source to produce poly-3-hydroxybutyrate-co-valerate (PHBV) by Ralstonia eutrophus (formerly Alcaligenes eutrophus) via oxygen limitation.
The production of PHBV could be optimized by optimizing the oxygen transfer through the fermentor. Thereby, a peak concentration of 1.1 g PHBV per liter cell suspension, 40 w% of cell dry weight, was obtained at an aeration rate of 0.24 mol O 2 /h•kg biomass. The yield of PHBV on the fatty acid concentration in the organic waste was 0.16 g polymer/g volatile organic matter. The process obtained, compares well with the commercial production process of PHBV based on glucose.