Process for producing feed protein
First Claim
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1. A process for producing yeast protein including the following steps:
- (a) subjecting biological waste material to anaerobic fermentation in a liquid medium to provide a yeast growth promoting substrate comprised of a mixture of volatile monocarboxylic acids;
(b) introducing into the resultant ferment a pellicle-forming yeast selected from the group consisting of Candida ingens and Pichia membranaefaciens;
(c) adjusting the ammonia nitrogen content of said liquid medium to a total nitrogen content of between 0.4% and 2.0% by weight of dry matter;
(d) allowing a surface layer of said yeast to grow on said liquid medium;
(e) gently circulating said medium beneath said surface layer without disturbing or breaking up said layer;
(f) skimming off said layer; and
(g) drying said skimmed yeast to form said yeast protein.
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Abstract
A process for producing yeast protein from biological waste material includes preliminary anaerobic fermentation of said material, inoculation with a pellicle-forming yeast growing as a surface layer, and skimming off and drying said surface layer. Specific yeasts are CANDIDA INGENS and PICHIA MEMBRANAEFACIENS.
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4 Claims
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1. A process for producing yeast protein including the following steps:
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(a) subjecting biological waste material to anaerobic fermentation in a liquid medium to provide a yeast growth promoting substrate comprised of a mixture of volatile monocarboxylic acids; (b) introducing into the resultant ferment a pellicle-forming yeast selected from the group consisting of Candida ingens and Pichia membranaefaciens; (c) adjusting the ammonia nitrogen content of said liquid medium to a total nitrogen content of between 0.4% and 2.0% by weight of dry matter; (d) allowing a surface layer of said yeast to grow on said liquid medium; (e) gently circulating said medium beneath said surface layer without disturbing or breaking up said layer; (f) skimming off said layer; and (g) drying said skimmed yeast to form said yeast protein. - View Dependent Claims (2, 3, 4)
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Specification