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Trace Element Supplementation of Cheese Whey for the Production of Feed Yeast

State University of Agriculture and Forestry, Department of Applied Microbiology, A-1190 Vienna Peter Jordanstrasse 82, Austria

ABSTRACT

The stimulating effect of some heavy metals, when added to cheese whey, on growth of the yeast Candida intermedia was investigated. With copper, manganese, zinc, iron, and molybdemum addition to whey, biomass productivity was increased enormously. The process was implemented by an Austrian dairy. In a 14-m³ jet fermentor 30,000 liters of whey were processed daily. The mash leaving the fermentor was concentrated to 12% yeast dry matter by a vacuum evaporator, and after supplementation with other nutrients was fed directly to pigs. Based on European prices, the yeast product was about 20% cheaper than soy meal.

Because the process is simple and can be run under nonaseptic conditions, it can be integrated fully into an existing dairy without additional operating personnel.