Journal of Pure and Applied MicrobiologyVol. 8 No. May 2014 Special Edition

Optimization of Bioethanol Production from Empty Fruit Bunches by Co-culture of Saccharomyces cerevisae and Aspergillus niger using Statistical Experimental Design

Md. Zahangir Alam* and Nur Hidayah ZainanMa?an Fahmi Al-Khatib

Bioenvironmental Engineering Research Centre (BERC), Department of Biotechnology Engineering, Faculty of Engineering, International Islamic University Malaysia (IIUM), 50728 Kuala Lumpur, Gombak, Malaysia.

Received on 08 January 2014 and accepted on 24 March 2014

 

ABSTRACT

Production of bioethanol from oil palm empty fruit bunches (EFB) by Saccharomyces cerevisae and Aspergillus niger is among the ways of reducing environmental pollution and consumption of crude oil. This study used sequential optimization approach based on statistical experimental design including Plackett-Burman (PB) design, one-factor-at-a-time (OFAT) and face-centered central composite design (FCCCD). Among the parameters tested, pH, temperature, inoculum size, potassium dihydrogen phosphate (KH2PO4), magnesium sulphate heptahydrate (MgSO4.7H2O) and peptone showed positive effects while yeast extract, malt extract, potassium chloride, urea and agitation were influencing the production negatively. The three parameters chosen for determination of the optimum values by response surface methodology (RSM) based on the FCCCD were pH, KH2PO4 and agitation. Although agitation showed negative effects it was considered in FCCCD due to the mixing effect of fermnetation. The validity of the model was verified and the optimum value of pH 5.5, agitation of 150rpm and 0.3% of KH2PO4 led to a maximum bioethanol production of 7.4 g/l. The yield of bioethanol was determined based on the reducing sugar (16.85 g/l) obtained from the EFB.

Keywords : Bioethanol production, Optimization, Face-Centered Central Composite Design, Empty fruit bunches, Saccharomyces cerevisae, Aspergillus niger.