ENERGY BALANCE, MATERIAL BALANCE AND COST BENEFIT ANALYSIS FOR THE PRODUCTION OF BIOETHANOL FROM NON-FOOD PARTS OF BITTER CASSAVA
Journal: Acta Chemica Malaysia (ACMY)
Author: Amina Nalweyiso, Noble Banadda, Ephraim Nuwamanya, John Baptist Kirabira, Arnold Katungisa
This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Bio energy is the predominant renewable energy source in most low-income countries though mostly with inefficient production and utilization technologies. The versatility and flexibility of bioenergy offers a variety of clean energy options. Bioethanol and biodiesel have received the most attention as alternative cooking and vehicle biofuels. Research on the production of bioethanol from the non-food parts of cassava including the leaves, stems and peelings has yielded promising results. However, the energy balance, material balance and cost benefit analysis usually lack in these studies. It is against this background that this study compared the dynamics of energy and material balance and their effect on the cost of bioethanol production from both cassava roots (without peelings) and non-food parts. A bitter variety and sweet variety were used. Bioethanol was produced from leaves, peelings, stems and roots by Simultaneous Saccharification and Fermentation followed by a two-step distillation and dehydration using zeolite. On average, the roots required 500 ml of distilled water per 50 g of a sample to produce 39.7 ml of 96% bioethanol, 464.8 ml of waste water and 17.4g of solid waste. The leaves, peelings and stems required 250 ml of D.H20 per 50 g of a sample to produce 80.9 ml of 95.3% bioethanol, 506.3 ml of waste water and 56.5g of solid waste. A negative energy balance and cost benefit ratio greater than one were obtained.