Parametric study on the ethanol fermentation of sweet sorghum (Sorghum bicolor L. Moench 'ICSV 25274') syrup under sterilized and unsterilized conditions.

Date

2013

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Rex B. Demafelis

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The effects of three, factors, namely, yeast, sugar concentration (expressed in ºBrix) and inoculum loading, on the fermentation of sweet sorghum ('ICSV 25274') syrup were tested under sterilized conditions. The best combinations of these factors were also tested in unsterilized conditions and further compared with 30% inoculum loading also under unsterilized conditions. Phase 1 of the experiment determined the best yeast to be S. bayanus, producing ethanol at 8.28%(v/v) in a 36 hour fermentation time. Phase 2 determined the best sugar concentration to be 20 ºBrix, producing final ethanol of 8.49% (v/v) at a fermentation time of 56 hours. Phase 3 determined the best inoculum loading to be 10%(v/v), producing 2.35% (v/v) ethanol within 36 hours. For all the mentioned phases, significant differences in fermentation performances were observed. The last revealed that the combination of the best conditions previously identified were best performed at unsterile conditions, with an overloading of 30% (v/v) inoculum. Extreme inhibition was noted for this variety at 25 and 30º Brix values, thus the need for further investigation for the composition and properties is suggested.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2013 E62 I44

Document Type

Thesis

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