The use of guinea corn husk and millet husk (agricultural waste with no appreciable value to industries or competitive use as food) as alternative and cost-effective feed stock for the production of bioethanol was examined. The methods used, included: acid hydrolysis with 2.5 M H2SO4, and simultaneous saccharification and fermentation with Aspergillus niger and Zymomonas mobilisisolated from soil and palm wine, respectively. Ethanol yield from guinea corn husk (26.83 g/l) and millet husk (18.31 g/l) was maximum at 120th h and with ethanol concentrations of 67.7 and 63.8%, respectively. The least ethanol concentration of 30% was obtained with A. niger on millet husk. A. niger and Z. mobilis may be better organisms for ethanol production from Guinea corn husk and millet husk.
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Oyeleke et al. (2009) studied this question.