From the operation of a demonstration pilot plant over extended periods of time, it has been shown that yeast may be grown on an acid whey or sweet whey medium in a continuous, deep tank aerated fermentor. Variations in fermentation conditions, strain selection, and medium composition produced cell concentrations of several billion cells per milliliter. By a process of evaporation and spray drying the whole fermented whey mass and the utilization of the evaporator condensate to dilute incoming condensed whey, a high grade, non-toxic, protein feed material may be produced without any effluent streams. Amino acid analyses and protein efficiency ratios are presented for this feed material. This whey fermentation is one means of converting large quantities of a potential environmental pollutant into a useful and needed product.

Report prepared by Milbrew Incorporated, Amber Laboratories Division, Juneau, Wisconsin. "Grant S-800747; Program element 1BB037." Includes bibliographical references (page 64).