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Design and Evaluation of an Optimal Controller for Simultaneous Saccharification and Fermentation Process

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dc.creator Murthy, Ganti S.
dc.creator Johnston, David B.
dc.creator Rausch, Kent D.
dc.creator Tumbleson, M. E.
dc.creator Singh, Vijay
dc.date.accessioned 2012-11-07T22:40:36Z
dc.date.available 2012-11-07T22:40:36Z
dc.date.issued 2012-01
dc.identifier.citation Murthy, G. S., Johnston, D. B., Rausch, K. D., Tumbleson, M. E., & Singh, V. (2012). Design and evaluation of an optimal controller for simultaneous saccharification and fermentation process. Applied Biochemistry and Biotechnology, 166(1), 87-111. doi: 10.1007/s12010-011-9406-9 en_US
dc.identifier.uri http://hdl.handle.net/1957/34959
dc.description This is the publisher’s final pdf. The published article is copyrighted by Springer Science and can be found at: http://www.springer.com/. en_US
dc.description.abstract Ethanol from corn is produced using dry grind corn process in which simultaneous saccharification and fermentation (SSF) is one of the most critical unit operations. In this work an optimal controller based on a previously validated SSF model was developed by formulating the SSF process as a Bolza problem and using gradient descent methods. Validation experiments were performed to evaluate the performance of optimal controller under different process disturbances that are likely to occur in practice. Use of optimal control algorithm for the SSF process resulted in lower peak glucose concentration, similar ethanol yields (13.38 +/- 0.36% v/v and 13.50 +/- 0.15% v/v for optimally controlled and baseline experiments, respectively). Optimal controller improved final ethanol concentrations as compared to process without optimal controller under conditions of temperature (13.35 +/- 1.28 and 12.52 +/- 1.19% v/v for optimal and no optimal control, respectively) and pH disturbances (12.65 +/- 0.74 and 11.86 +/- 0.49% v/v for optimal and no optimal control, respectively). Cost savings due to lower enzyme usage and reduced cooling requirement were estimated to be up to $1 million for a 151 million L/yr (40 million gal/yr) dry grind plant. en_US
dc.language.iso en_US en_US
dc.publisher Springer Science en_US
dc.relation.ispartofseries Applied Biochemistry and Biotechnology en_US
dc.relation.ispartofseries Vol. 166 no. 1 en_US
dc.subject Dry grind corn ethanol en_US
dc.subject Saccharomyces cerevisiae en_US
dc.subject Cybernetic model en_US
dc.subject SSF process en_US
dc.subject Optimal controller en_US
dc.subject Gradient descent en_US
dc.subject Process disturbances en_US
dc.title Design and Evaluation of an Optimal Controller for Simultaneous Saccharification and Fermentation Process en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1007/s12010-011-9406-9

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