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ARS Home » Plains Area » Brookings, South Dakota » Integrated Cropping Systems Research » Research » Publications at this Location » Publication #245645
Title: Desorption Studies of DDGS under Varying CDS and Temperature Levels

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

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/17/2009
Publication Date: 9/17/2009
Citation: Bhadra, R., Kannadhason, S., Rosentrater, K.A., Muthukumarappan, M. 2009. Desorption Studies 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) often contains approximately 30-35% (db) protein and 10-12% (db) fat, and has been shown to be an excellent livestock feed. DDGS is produced from the fuel ethanol industry, which is located in the midwest US; there is a growing need to transport DDGS over long distances via rail, which can result in problems due to poor flowability when unloading. DDGS is formed by combining condensed distillers solubles (CDS) with distillers wet grain (DWG) and then at high temperatures. It is hypothesized that drying conditions can affect resulting DDGS chemical, physical and flow properties, but there is currently little quantified information about desorption and drying behavior for DDGS. Thus, the objective of this study was to investigate the moisture desorption pattern of DDGS for three CDS addition levels (10, 15, and 20% (wb)) at three drying temperatures (100, 200, and 300°C). Multiple mathematical models (Page, Newton, Pilosof, Henderson-Pabis, and others) were used to fit the observed data for moisture over time. A new comprehensive model was developed for moisture ratio vs. time (the best fit had R2= 0.91, SEM = 0.17) using a modified Page model with varying CDS and temperature levels. This study will be useful to predict moisture content values for various drying times, CDS addition levels, and drying temperatures, and will thus be a benefit to industrial processing conditions.

Technical Abstract: Distillers dried grains with solubles (DDGS) often contains approximately 30-35% (db) protein and 10-12% (db) fat, and has been shown to be an excellent livestock feed. DDGS is produced from the fuel ethanol industry, which is located in the midwest US; there is a growing need to transport DDGS over long distances via rail, which can result in problems due to poor flowability when unloading. DDGS is formed by combining condensed distillers solubles (CDS) with distillers wet grain (DWG) and then at high temperatures. It is hypothesized that drying conditions can affect resulting DDGS chemical, physical and flow properties, but there is currently little quantified information about desorption and drying behavior for DDGS. Thus, the objective of this study was to investigate the moisture desorption pattern of DDGS for three CDS addition levels (10, 15, and 20% (wb)) at three drying temperatures (100, 200, and 300°C). Multiple mathematical models (Page, Newton, Pilosof, Henderson-Pabis, and others) were used to fit the observed data for moisture over time. A new comprehensive model was developed for moisture ratio vs. time (the best fit had R2= 0.91, SEM = 0.17) using a modified Page model with varying CDS and temperature levels. This study will be useful to predict moisture content values for various drying times, CDS addition levels, and drying temperatures, and will thus be a benefit to industrial processing conditions.