Monday, May 4, 2009 - 4:00 PM
5-06
Use of palm kernel press cake for production of bioethanol and feed
Henning Jørgensen1, Claus Felby1, Anand R. Sanadi1, Niels Erik Krebs Lange2, and Steffen Ernst2. (1) Forest and Landscape, University of Copenhagen, Rolighedsvej 23, Frb. C., Denmark, (2) Novozymes A/S, Krogshøjvej 36, Bagsværd, DK-2880, Denmark
Palm kernel press cake (PKC) is a residue from palm oil extraction, composed mainly of polysaccharides from cell-wall material, of which the carbohydrate mannan is the most predominant. Due to increased demand for plant oils globally there has been a tremendous increase in palm oil production in recent years. In Indonesia and Malaysia
Mannose can readily be fermented to ethanol by normal yeast Saccharomyces cerevisiae. The first step in the conversion of PKC is then an efficient hydrolysis of polymers, mainly mannan, into fermentable monomers. The present study examines the pretreatment requirements and especially the enzymatic hydrolysis of polysaccharides from the cell-wall material present in PKC by various enzyme preparations in order to achieve high amounts of free monosaccharides. The process has been tested at high solids concentrations and it was possible to operate at up to 50% DM. The resulting hydrolysates were easily fermented by Saccharomyces cerevisiae with high ethanol yields. Various process configurations (SHF and SSF) were also tested. In addition, the processing of PKC resulted in a new feed product with increased protein content, which could be beneficial for the feeding value of this new residue.
Mannose can readily be fermented to ethanol by normal yeast Saccharomyces cerevisiae. The first step in the conversion of PKC is then an efficient hydrolysis of polymers, mainly mannan, into fermentable monomers. The present study examines the pretreatment requirements and especially the enzymatic hydrolysis of polysaccharides from the cell-wall material present in PKC by various enzyme preparations in order to achieve high amounts of free monosaccharides. The process has been tested at high solids concentrations and it was possible to operate at up to 50% DM. The resulting hydrolysates were easily fermented by Saccharomyces cerevisiae with high ethanol yields. Various process configurations (SHF and SSF) were also tested. In addition, the processing of PKC resulted in a new feed product with increased protein content, which could be beneficial for the feeding value of this new residue.