Valorization of Coffee Husk to Bioethanol Using SHF Method
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Date
2018-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
AAU
Abstract
Coffee husk considers as one of the agricultural waste lignocellulosic biomass that contain high
amount of cellulose. Furthermore, the aim of this work was, valorization of coffee husks to
bioethanol by using separate hydrolysis and fermentation methods which is critically used as
replacements for renewable sources of energy and to minimize environmental pollutions too.
This method was accomplished by four major experimental procedures, which were
pretreatment, hydrolysis, fermentation and distillation processes. There were three parameters
and 20 lab experiments exposed in the laboratory work depending on the H
2
ii
SO
4
concentration,
hydrolysis temperature and time in the hydrolysis step. The effect of these parameters was
analyzed using design expert soft war by CCD design. The results were show that the content
of sugars increased as the acid (H
2
SO
4
) concentration increased from 1% - 3 % and decreased
as the acid concentrations increased from 3 % up to 5%. At the optimal acid concentration (3%;
H
2
SO
4
), hydrolysis temperature (130 ℃) and hydrolysis time (70min), the sugar yield gotten
was 46.75% from the coffee husk. This sample was further investigated to produce bioethanol
and the ethanol yield from this experiment was 51.03%. Based on central composite design
ANOVA was carried out to determine the numerical significance of the quadratic response
surface model, in which the p-value of the model was less than 0.0001, which shows the model
was statistically significant. Consequently, based on this result, the designated model was
adequate to fit the data of response variable. Characterization of the bio-ethanol produced was
accomplished by FTIR analyzer.
Description
Keywords
SHF Method, Coffee Husk, Bioethanol