Title: OPTIMIZATION OF ETHANOL PRODUCTION FROM SWITCHGRASS (Panicum virgatum L.) GROWN IN SOKOTO GEOECOLOGICAL ZONE OF NIGERIA
Author(s): Abdullahi AA, BL Aliero, AA Aliero, AA Zuru and AB Rabah
The effect of acid concentration, temperature and heating time on fermentation of switchgrass (Panicum virgatum L.) fedstock grown during 2008/2009 and 2009/2010 seasons Sokoto, Nigeria in the production of ethanol was investigated. The hydrolysates was pretreated with 3, 4 and 5% hydrochloric acid concentrations at 30,40 and 500C for 20, 25 and 30 minutes for five days. The hydrolysate was fermented using S. cerevisiae, Z. mobilis and combination of the two organisms. The highest yield of reducing sugar was obtained from hydrolysates treated with 50 and 75 kg N/ha at all the temperature regimes used at 4% acid concentrations and at the treatment time of 20, 25 and 30 minutes. The control had the lowest quantity of reducing sugar at all the treatments and locations. The combination of S. cerevisiae and Z. mobilis gave the highest concentration of bioethanol compared with when single organism is used in the fermentation. Result of this study suggests that the combination of S. cerevisiae and Z. mobilis produced the highest bioethernol content and reinforced its potential as a source of bioethernol. This indicates the potentials of the hydrolyzing organisms, the fermentative organism and the switchgrass feedstock for large scale bioethanol production is emphasized.
Keywords: Bioethanol, Switchgrass, Bioenergy, Hydrolysis, Fermentation.