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ARS Home » Plains Area » Brookings, South Dakota » Integrated Cropping Systems Research » Research » Publications at this Location » Publication #245648
Title: Drying Kinetics of DDGS under Varying CDS and Temperature Levels

Author
item BHADRA, RUMELA - South Dakota State University
item KANNADHASON, S - South Dakota State University
item MUTHUKUMARAPPAN, M - South Dakota State University
item Rosentrater, Kurt

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/17/2009
Publication Date: 9/17/2009
Citation: Bhadra, R., Kannadhason, S., Muthukumarappan, M., Rosentrater, K.A. 2009. Drying Kinetics of DDGS under Varying CDS and Temperature Levels. 2009 ASABE Annual International Meeting, Reno NV, June 21-24, 2009.

Interpretive Summary: Distillers dried grains with solubles (DDGS) is mainly used as animal feed, as it has high energy and protein contents. There is a growing need to transport DDGS over long distances. But transportation of DDGS is often troublesome due to caking of the particles. DDGS is formed by combining condensed distillers solubles (CDS) with distillers wet grains (DWG), and then drying. Drying kinetic behavior for DDGS has not yet been reported, but it can impact resulting chemical, physical, and flow properties of the DDGS. Thus, the objective of this study was to investigate drying behavior of DDGS using three CDS addition levels (10, 15, and 20% (wb)) and three drying temperature levels (100, 200, and 300°C). Multiple mathematical models (such as Chen and Douglas model, stepwise regression, Box-Cox transformation, and others) were used to fit experimental data for moisture content vs. drying rate. A new comprehensive model was developed for drying rate vs. moisture content (the best fit had R2 = 0.89, SEM = 18.60) using the modified Chen and Douglas model, incorporating varying CDS and temperature terms. This model can be used for examining drying behavior and resulting flowability studies using a broad range of operating conditions, and thus may help the industry handle and transport DDGS better.

Technical Abstract: Distillers dried grains with solubles (DDGS) is mainly used as animal feed, as it has high energy and protein contents. There is a growing need to transport DDGS over long distances. But transportation of DDGS is often troublesome due to caking of the particles. DDGS is formed by combining condensed distillers solubles (CDS) with distillers wet grains (DWG), and then drying. Drying kinetic behavior for DDGS has not yet been reported, but it can impact resulting chemical, physical, and flow properties of the DDGS. Thus, the objective of this study was to investigate drying behavior of DDGS using three CDS addition levels (10, 15, and 20% (wb)) and three drying temperature levels (100, 200, and 300°C). Multiple mathematical models (such as Chen and Douglas model, stepwise regression, Box-Cox transformation, and others) were used to fit experimental data for moisture content vs. drying rate. A new comprehensive model was developed for drying rate vs. moisture content (the best fit had R2 = 0.89, SEM = 18.60) using the modified Chen and Douglas model, incorporating varying CDS and temperature terms. This model can be used for examining drying behavior and resulting flowability studies using a broad range of operating conditions, and thus may help the industry handle and transport DDGS better.