Abstract:
Reject pulp has not been harnessed into value-added products. Utilization of reject pulp
containing 85.16% cellulose, 10.33% hemicellulose, lignin-klason 3.15%, 1.16%
extractive-EB and 0.20% ash (ash) can be done with the Saccharification and Co-
Fermentation unison (SKFS) to be converted into bioethanol. Saccharification process
using the enzyme cellulase, xylanase and selobiase and co-fermentation process using the
yeast Saccharomyces cerevisiae and Pichia stipitis. The purpose of this study was to
determine the pH and the best time to produce bioethanol. This study varying the pH of
the initial solution of 4, 4.5 and 5, and the time variation SKFS 24, 36, 48, 60, 72, 84
hours. Tests on samples made with Alkoholmeter. The results showed that the highest
concentration of ethanol obtained in the SKFS to 40 g / L at initial pH 5 solution within 48
hours.
