Citrus Waste Biomass Program Page: 1 of 23
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Final Technical Report
Project Title: Citrus Waste Biomass Program
Date of Report: January 30, 2007
Recipient: Renewable Spirits LLC
DOE Award Number: DE-FG36-04GO14331
Covering Period: 9/30/2004 - 9/30/2006
Working Partners: USDA Agricultural Research Service CRADA 58-3K95-4-1053
Cost-Sharing Partners: None
Project Director: Scott Stevenson
Contact: Scott Stevenson, Tel: 561-306-5312, email: GweenScottCookie@aol.com
Executive Summary
Florida has 103 million citrus trees on 800,000 acres that last season provided 287 million boxes
of citrus (80% of U.S. production); 85% went to Florida's 23 citrus processing plants. In juice
processing one half of a citrus fruit is waste, yielding 5 million tons of wet waste, equating to
1.25 million tons of dry waste. Traditional use for these residues is as cattle feed which currently
does not have sufficient value to cover the production/transportation costs. These materials are
rich in pectin and other polysaccharides which can be hydrolyzed into sugars. This equates to a
potential production of 120 million gallons of ethanol per year. Renewable Spirits LLC in
collaboration with a CRADA partner, USDA/ARS Citrus and Subtropical Products Laboratory,
developed an innovative process for the production of ethanol from citrus processing waste
(CPW). The novel process based on enzymatic hydrolysis of CPW and fermentation of resulting
sugars by yeasts was successively scaled up from laboratory scale to a 10,000 gal fermentor
level. Numerous technical obstacles were overcome and continuous pretreatment and
hydrolysis/fermentation sections were designed, constructed and successfully tested.- 1 -
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Grohman, Karel & Stevenson, Scott. Citrus Waste Biomass Program, report, January 30, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc878985/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.