532 / 2018-09-20 11:09:27

Energetic and environmental integration of sugar cane byproducts factories

全体主题 > 生物质燃气

In Cuba some Sugar cane mills have ethanol and fodder yeast productions closed which use molasses as raw materials. Although ethanol is an economical feasible production, its waste waters, usually called vinasses, are very aggressive for the environment because its high organic charge which treatment increase the ethanol productions cost. Nevertheless, fodder yeast produced by the aerobic propagation of Candida utilis yeast have a higher production cost because the prices of the carbon source (molasses) and the energy demand for yeast drier and the electricity consumptions. The integration of these two productions with the biogas generation using the wastes waters from both industries represents and interesting environmental and energy solution for this combined production.
Different alternatives of process integrations of these factories are evaluated in this work. The use of the waster waters coming from ethanol and yeast production for biogas generation, as well as the used of vinasse as carbon source for the yeast production to satisfy the energy needed for this plant are evaluated and compared.
The use of other sugar mills organic wastes as trash and filter mud are alternatives not evaluated in this work that may contribute to the energy generations for both the ethanol and yeast factories and to sell the energy surplusto the grid.