METHOD FOR CONVERTING ANIMAL WASTE PRODUCTS INTO A FOOD SUPPLEMENT

• US 3,846,558 A
• Filed: 12/22/1970
• Issued: 11/05/1974
• Est. Priority Date: 11/24/1969
• Status: Expired due to Term

• Current Assignee: Roger H. Stevens
• Original Assignee: Roger H. Stevens
• Inventors: Stevens, Roger H.
• Primary Examiner(s): Jones, Raymond N.
• Application Number:
  US05/100,587
• Time in Patent Office: 1,414 Days
• Field of Search: 99/9,2R 195/82 210/2,11,12,15,18 426/2,56,59
• US Class Current: 426/2
• CPC Class Codes: A23J 1/002 from animal waste materials A23J1/10 takes precedence
• CPC Class Codes: A23K 10/12 by fermentation of natural products, e.g. of vegetable material, animal waste material or biomass
• CPC Class Codes: A23K 10/26 from waste material, e.g. feathers, bones or skin A23K10/24 takes precedence
• CPC Class Codes: A23L 5/28 using microorganisms
• CPC Class Codes: B01F 23/2331 characterised by the introduction of the gas along the axis of the stirrer or along the stirrer elements
• CPC Class Codes: B01F 23/233642 at the stirrer elements
• CPC Class Codes: C12M 27/04 with introduction of gas through the stirrer or mixing element
• CPC Class Codes: C12M 27/06 with horizontal or inclined stirrer shaft or axis
• CPC Class Codes: Y10S 435/804 Single cell protein

Abstract

An animal feeding process wherein animal waste products are collected and fed to a storage vat and combined with a small quantity of a yeast culture and the combination of these products are aerated and agitated. The yeast culture in the presence of oxygen consumes the nutrients in the waste products and converts the waste products into a high protein animal feed supplement. This yeast product is then removed and added to the animal'"'"''"'"'s feed i.e., ground corn, bean meal and the like.

Claims

1. A METHOD OF INCREASING THE WEIGHT OF A GROUP OF SWINE WHICH COMPRISES:

FORMING A SLURRY OF SOLID AND LIQUID WASTE PRODUCTS OF SAID SWINE AND A YEAST CAPABLE OF ASSIMILATING NITROGEN FROM UREA, SAID SLURRY CONTAINING FROM 1 TO 25 PERCENT OF SAID SOLID WASTE;

AERATING AND AGITATING SAID SLURRY WHILE MAINTAINING ITS TEMPERATURE AT ABOUT 775* TO 95*F AND ITS PH AT ABOUT 4 TO 6.5 FOR A PERIOD OF TIME SUFFICIENT TO EFFECTUATE A FERMENTATION PROCESS AND WHICH PRODUCES A SWINE FEED SUPPLEMENT BY CONVERTING THE NITROGEN IN SAID WASTE TO A HIGH PROTEIN PRODUCT CONTAINING INCREASED AMINO ACIDS IN AN AMOUNT OVER THAT IN THE RAW PRODUCT AND FEEDING SAID SWINE FEED SUPPLEMENT OF SAID SWINE.

2. The process of claim 1 wherein phosphoric acid is added to said slurry to maintain said pH.

3. The method of claim 1 wherein a portion of said product of the fermentation is periodically withdrawn from said vessel and a similar amount of said waste product is added to said vessel.

4. The method of claim 1 wherein said slurry contains approximately 13 percent solids by weight.

5. The method of claim 1 wherein said swine feed supplement contains approximately the same solids content as said slurry.

6. The method of claim 1 wherein said feRmentation process is initiated by the addition of yeast and a sugar to said waste products.

7. The method of claim 6 wherein said yeasta is Candida utilis.

8. A method of increasing the weight of a group of swine and disposing of their waste products which comprises:

forming an aqueous slurry of the solid and liquid excrement from said swine, said slurry containing a yeast product; and

said slurry containing from about 1 to 25 percent of said solid excrement;

aerating said slurry while maintaining its temperature at about 75* to 95*F and its pH at about 4 to 6.5 until the percentage of protein in the excrement slurry has increased and the urea content thereof has been substantially eliminated to thereby form a swine feed supplement;

mixing said swine feed supplement with conventional swine rations and, feeding said mixture to said swine.

9. The method of claim 8 wherein the conventional swine rations comprise corn and soy bean.

10. The method of claim 8 wherein phosphoric acid is added to the slurry to maintain it at said pH.

11. The method of claim 8 wherein said process is carried out in a vessel, a portion of said treated slurry is periodically withdrawn from said vessel and a similar amount of said waste product is added to said vessel.

12. The method of claim 8 wherein the step of aerating said slurry comprises dispersing pressurized oxygen-bearing gas in said slurry and breaking up said gas into bubblets thereby to maintain said gas bubblets in solution in the slurry.

13. The method of claim 8 wherein the conversion of the swine waste is initiated by the addition of yeast and a sugar to said aqueous slurry.

14. The method of claim 13 wherein said yeast is Candida utilis.

15. A method comprising the steps of forming an aqueous slurry of solid and liquid swine excreta, said slurry containing from about 1 to 25 percent of said solid excreta, said slurry containing a yeast product, aerating said slurry while maintaining it at a temperature of about 75* to 95*F and at a pH of about 4 to 6.5 until the urea content of said swine excreta slurry has been substantially eliminated thereby forming a swine feed supplement, and feeding the swine feed supplement obtained thereby to swine.

16. A continuous method for converting swine waste products into a swine feed supplement comprising the steps of (1) aerating an aqueous slurry of solid and liquid swine excreta in a vessel, said slurry containing from about 1 to 25 percent of said solid excreta and, said slurry containing a yeast product, while maintaining it at a temperature of about 75* to 95*F and its pH at about 4 to 6.5 until the urea content of said swine excreta has been substantially eliminated and (2) periodically removing a portion of said slurry from said vessel for use as a swine feed supplement and replacing each said portion with a similar amount of solid and liquid swine excreta in said vessel for treatment as described in step (1).