Abstract: A method for production of ethanol and yeast protein provides a lactose extraction and conversion process resulting in ?8.5% V/V of alcohol after fermentation with up to ?95% lactose conversion efficiency. Fermentation time is 24 hours and monitoring and adjusting of pH throughout the process in not required. In addition to ethanol, yeast protein feed is extracted after fermentation and provides up to 28% protein content as dry matter.

Abstract: The present invention is a system for producing ethanol and yeast protein feed by fermenting whey permeate, a dairy waste product using four types of tanks: an inoculation tank, a seeding tank, a propagation tank, and a fermentation tank. Whey permeate and various chemicals are added to each of the tanks before being heated. The fermentation process for producing ethanol and yeast protein feed from whey permeate lasts 24 hours.