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Adepoju, T. F.
Department of Chemical/Petrochemical Engineering, Akwa-Ibom State University, Ikot Akpaden, Nigeria. P.M.B 1167, Uyo, Nigeria
Emenka, B.
Department of Chemical/Petrochemical Engineering, Akwa-Ibom State University, Ikot Akpaden, Nigeria. P.M.B 1167, Uyo, Nigeria
Ekwere, O. B.
Department of Chemical/Petrochemical Engineering, Akwa-Ibom State University, Ikot Akpaden, Nigeria. P.M.B 1167, Uyo, Nigeria
Akwayo, I. J.
Department of Chemical/Petrochemical Engineering, Akwa-Ibom State University, Ikot Akpaden, Nigeria. P.M.B 1167, Uyo, Nigeria
ABSTRACT
In this study, coconut fiber was utilized as a raw
material to produce bioethanol. The fibre was pretreated of to reduce lignin
content, hydrolysis of fibre using acid and fermentation of the sugar substrate
using Saccharomyces cerevisae were carried out. Alkaline pretreatment was
carried out using 5% NaOH solution to treat the fibre at 121°C in an autoclave.
After pretreatment, the fibre was washed and the pH was adjusted to 7.
Hydrolysis was carried out using different acid concentration from 0.5 - 3.5 M
to produced glucose. After hydrolysis, the pH of the filtrate was adjusted to
the optimum value of fermentation pH within the range of 4.5-5.0. Using the
yeast culture (Saccharomyces cerevisae) the fermentation process was carried
out for contact time of 2, 4, 6 and 8 days to produce ethanol. To separate the
ethanol product from the broth, simple distillation was used, analysis of the
product sample showed that the concentration of the acid used during the
hydrolysis process actually affected the amount of glucose produced for
subsequent fermentation to bioethanol. The highest yield of ethanol which was
3% of the total weight of fibre used was obtained from the substrate produced
using 2.5 M of acid and fermented for 6 days.
Keywords: Agro-waste, Coconut Fiber, Bioethanol, Pretreatment, Hydrolysis, Fermentation
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Published
Thursday, December 27, 2018
Issue
Vol. 4 No. 2, DEC 2018
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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