Fractionation of distillers dried grains with solubles (DDGS) by combination of sieving and aspiration
2017
Cheng, Ming-Hsun | Rosentrater, Kurt A.
Distiller’s dried grains with solubles (DDGS) is a coproduct of the corn-based ethanol industry and it is a good resource of protein and oil for animal feeds. High protein and oil content DDGS is desired because of its high nutrition and economic values. Physical separation is an easy approach to increase oil and fat content based on profiles of components. Protein and oil rich DDGS tends to exist in the finer particle; fibers rich DDGS is observed in large particle fraction. A primary sieving connected with aspiration fraction is used to condense protein and oil contents for DDGS. Particle size, air flowrate and different fractions derived by aspiration are independent variables. The proper combination and interaction of variables for protein and oil separation are higher flowrate, smaller particle sizes, and the heavy fraction. And, the best efficiency for protein and oil separation reaches about 29.7% and 68.15% respectively. For fiber separation, a mild condition results in higher fiber content approximately 7%. Additionally, the relationship between nutrient separation and independent variables can be expressed by a linear model. The combination of primary sieving and aspiration with specific air flowrate used in fractionation process can increase value to the corn-based ethanol industry.
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