Malaysian Applied Biology Journal

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Malays. Appl. Biol. (2019) 48(5): 59–65




SALEH, A.A.1*, REDDY, A.N.R.1,2, NADIA, N.A.1, CHARYULU, D.K.2 and HAMDAN, S.1

1Department of Mechanical and Manufacturing Engineering, Faculty of Engineering,

Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia

2Department of Mechanical Engineering, Malla Reddy College of Engineering & Technology,

Secunderabad - 500100, Telangana, India

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Accepted 30 November 2019, Published online 31 December 2019


This research was carried out to evaluate utilisation of Ubi Gajah (Manihot esculenta), a non-edible cassava species, as a feedstock for bioethanol production by acid hydrolysis. The Ubi Gajah peels and pulp substrates were hydrolysed for a max. of 48 hrs with H2SO4 acid concentration ranges 5% v/v to 15% v/v at high temperature and pressure before fermentation process. While the yield was noted at 24 hr of 15% v/v acid hydrolysis. From the experimental results yield of bioethanol for Ubi Gajah Peel and Pulp 156.65 g/L and 220.89 g/L were noted respectively when both the substrates were hydrolysed with 15% v/v of H2SO4. The FTIR Spectra of the bioethanol, confirms –OH, C-O and C=C groups by absorption bands at 3251.98 cm-1 to 3315.63 cm-1; 1045.42 cm-1 and 1085.92 cm-1; and 1633.71 cm-1 and 1645.28 cm-1 respectively. The biofuel properties were tested according to ASTM standards and found to be complacent. The Bioethanol - diesel blends (BDB) of 5% to 20% v/v were prepared and fuel performance test was conducted on a diesel engine. The performance and emission results confirm suitability of the bioethanol as an alternative fuel.

Key words: Bioethanol, Ubi Gajah, acid hydrolysis


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