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Solid Precipitation from Potato Protein Liquor by Ethanol
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)ORCID iD: 0000-0002-1711-7294
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)
University of Borås, Faculty of Textiles, Engineering and Business. (Biotechnology)
2015 (English)Conference paper, (Refereed)
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The production of starch in European Union (EU 28) was around 10 million tonnes in 2013, 12.6% of them being from potato1. During the potato processing, two main by-products which have high Biological Oxygen Demand (BOD) are formed, i.e. potato pulp (PP) and potato liquor (PL)2. Proteins can be partially recovered from PL, resulting in a concentrated residual material known as potato protein liquor (PoPL)2,3. The use of PoPL has been investigated to cultivate fungal4 and yeast3 biomass, and produce enzymes2. However, presence of nitrogen and phosphate containing materials as well as suspended solids at high concentrations4 limits its application in bioprocesses. The present study was proposed to investigate the precipitation of components from PoPL by ethanol in order to get an easily fermentable solution. PoPL from Lyckeby Starch AB was mixed with different amounts of ethanol and centrifuged at 3000 g for 5 min. The liquid obtained was put under a fume hood for 48 h at room temperature for ethanol evaporation. All the samples had their volumes adjusted to the same value using distilled water. The precipitate was dried at 105 °C. All experiments were done in duplicate. The precipitation of solids improved almost 500% for a mixture of equal volumes of PoPL and ethanol compared to PoPL without ethanol addition. The protein and ash contents of the precipitate were respectively higher than 245 g/kg and 420 g/kg in all the cases, making it eligible for production of fertilizer or animal feed. Most of the analysed sugars (glucose, fructose, and sucrose) stayed in the liquid phase. Ethanol concentration in the liquid phase remained close to initial value after the 48-hour evaporation. This indicates the need for a distillation column for ethanol recovery before the remaining sugar solution can be used for fermentation purposes.

Place, publisher, year, edition, pages
2015.
Keyword [en]
Potato Protein Liquor; Protein Precipitation; Animal Feed
National Category
Other Chemical Engineering
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-8396OAI: oai:DiVA.org:hb-8396DiVA: diva2:892595
Conference
10th European Congress of Chemical Engineering
Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2016-01-11

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CiteExportLink to record
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