期刊
JOURNAL OF BIOTECHNOLOGY
卷 265, 期 -, 页码 46-53出版社
ELSEVIER
DOI: 10.1016/j.jbiotec.2017.10.020
关键词
Downstream processing; Molecular weight; Pigments; Residual biomass; Anaerobic digestion
资金
- Austrian Climate and Energy Funds [834422]
- Austrian COMET programme [844605]
- EVN AG
- ANDRITZ AG
- project SoMoPro [6SA18032]
- European Union
- South Moravian Region [665860]
This study evaluates a biorefinery concept for producing poly(3-hydroxybutyrate) (PHB) with the cyanobacterial strain Synechocystis salina. Due to this reason, pigment extraction and cell disruption were investigated as pretreatment steps for the harvested cyanobacterial biomass. The results demonstrated that at least pigment removal was necessary to obtain PHB with processable quality (weight average molecular weight: 569-988 kg mol(-1), melting temperature: 177-182 degrees C), which was comparable to heterotrophically produced PHB. The removed pigments could be utilised as additional by-products (chlorophylls 0.27-1.98 mg g(-1) TS, carotenoids 0.21-1.51 mg g(-1) TS, phycocyanin 0-127 mg g(-1) TS), whose concentration depended on the used nutrient source. Since the residual biomass still contained proteins (242 mg g(-1) TS), carbohydrates (6.1 mg g(-1) TS) and lipids (14 mg g(-1) TS), it could be used as animal feed or converted to biomethane (348 m(n)(3) t(-1) VS) and fertiliser. The obtained results indicate that the combination of photoautotrophic PHB production with pigment extraction and utilisation of residual biomass offer the highest potential, since it contributes to decrease the environmental footprint of the process and because biomass could be used in a cascading way and the nutrient cycle could be closed.
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