Abstract
Waste can be minimized by reuse or recover by the process due disposal of the waste is big issue for environment. So many organization are working for to utilized the waste for energy recovery. Field crops offer potential source of fuel, offering promise as large-scale energy and based on its genetic diversity, climatic adaptation, and biomass and sugar production. Lignocellulosic biomass is the most abundant organic raw material in the world. Production of ethanol from renewable lignocellulosic resources may improve energy availability, decrease air pollution and diminish atmospheric CO2 accumulation. Presently this work was to evaluate the feasibility of ethanol production and optimization from Rice husk by using commercial bakery yeast, i.e., S. cereviciae. The experiment was conducted, at fermentation temperature 30 °C and pH 5, and treated using different acid concentrations and residence times. Rice husk was hydrolyzed by refluxing, a solid to liquid ratio of 1:10, using dilute sulfuric acid (1 to 5 %) and distilled water at hydrolysis time of 1 to 11 hours keeping boiling temperature. 90 % maximum total sugar concentration was obtained at 5 h acid free hydrolysis. Based on these hydrolysis results, fermentation process was performed.Â
Highlights
Ethiopia is a rural based country and nearly about 65% populace is living in villages
After that ethanol concentration 5.7, 5.1, 4.7, 3.6, 2.9 g/l decreases with increase in acid 1, 2, 3, 4, 5%. This condition is similar where maximum amount of ethanol from distilled water hydrolysate than acid hydrolysates of Prosopis juliflora. This decrease in bioethanol concentration may account for the further sugar degradation that occurred under the severe acidity [14]
These results indicate that extreme acidity had an unfavorable effect on sugar conversion of rice husk
Summary
Ethiopia is a rural based country and nearly about 65% populace is living in villages. The villages in the country are naturally endowed with variety of natural energy sources, by which means it is possible to develop self energy generating villages to satisfy the energy demand. The villages in the country have strong and abundant natural energy sources. The crop residue and livestock waste and the forest excess wood are main available sources of biomass in the villages. Biomass source is the emerging energy among renewable energy sources having potential to fulfill the energy demand of the rural areas to enhance the rural economy in developing countries [3]. A potential source for low cost ethanol production is to utilize lignocellulosic materials such as crop residues, grasses, sawdust, wood chips, solid animal waste and industrial wastes [4].
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