Suplementação de permeado de soro de leite para produção de etanol

Abstract

Currently Brazil has great milk production, and much of this production is destined to cheesemaking. In this process there is the generation of an exorbitant amount of residue, known as whey permeate, which has a high BOD and highly harmful to the environment and given high value treatment. One way to reduce the organic content of the waste is the use of membrane separation process for removal of proteins and production of protein concentrates used as supplement in animal and human nutrition, however, even after this process the residue generated whey permeate milk, has also high biochemical oxygen demand. Due to the composition of the permeate of whey is rich in lactose, it becomes possible to use the enzymatic process to obtain fermentable monosaccharides, in order to fermentation to obtain ethanol. In the present work we tested different supplementation to permeate whey seeking better yields and increased production of ethanol, and it was concluded that Saccharomyces cerevisiae has need supplements that provide nitrogen to the environment. Protein supplements have the best results of this study, while supplements the base salts showed satisfactory results when compared to fermentation of pure whey permeate.