Efecto del uso de diferentes antiespumantes en la fermentación anaerobia de Mucilago de cacao CCN-51 en diversas concentraciones de la levadura Saccharomyces cerevisiae y su influencia en la producción de bioetanol

Abstract

The main objective of this graduation paper was to check how the use of three different antifoams with different characteristics that play efficiently the functions of eliminating, decreasing or preventing foaming; these are Silicone oil, Sodium Alginate and Polyethylene glycol; this is depending on the variation of Saccharomyces cerevisiae yeast used whit values of 3, 10 and 20 grams per liter; and this way it will improve the fermentation process. The process was carried out in a Batch Biotron GX Single Vessel reactor, inoculating microorganisms in the stabilized solution with already established parameters of pH, temperature, dissolved oxygen (DO) and stirring speed. The use of antifoams was considered at a dosage less than 1% concentration and was applied according to the generation of foam. Chemical physical parameters such as alcohol concentration and Brix consumption were measured to track the fermentation process, as well as variation in foam levels was measured to determine the effectiveness of each antifoam. In this way it is found that the three antifoams with which it worked correctly fulfill the function of foam removal, however the silicone oil and sodium alginate come to interfere in the correct development of the fermentation process but the Polyethylene Glycol shows effective foal removal results without interfering with the chemical characteristics of the process using a concentration of 0,25% efficiently, making it the best choice when obtaining bioethanol from mucilage of cocoa CCN-51 type.