US 4,282,256 AGranted

Preparation of an animal feed supplement from fish cannery process waste water

AssigneeStar-Kist Foods, Inc.

InventorsVince J. Evich, Gerald C. Brown, Howard J. Dunn

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Abstract

There is disclosed a method for the preparation of an animal feed supplement from fish cannery waste process water in which the water is maintained under aerobic conditions and is processed through a flotation cell to separate the oils and proteins contained in the water as a concentrated sludge. The sludge is dewatered, blended with a bulk, solid carrier preserved against oxidative spoilage of the lipids with an effective anti-oxidant, and dried in vacuum under low temperature conditions to obtain an animal feed supplement in dry particulate form. The processing of the waste water is done under aerobic conditions to promote the growth of yeast and non-toxic, aerobic, bacterial improve color and odor and texture, and enhance the feed value of the sludge recovered from the processing.

Claims12

Dependent claims

A method for the preparation of an animal feed from fish cannery wastes comprising:

aerating fish cannery waste water until the water is substantially saturated with air;
separating the aerated waste water with an air flotation cell, in the presence of a first polyionic polymer and a floculating agent, into a sludge fraction concentrated in fat and protein, a clarified water fraction, and a grit fraction;
aerating the separated sludge fraction;
dewatering the sludge fraction by centrifugation in the presence of a second polyionic polymer with substantially the opposite charge of said first polyionic polymer;
adding to the aerated, dewatered sludge an antioxidant to prevent oxidation of lipids in the sludge;
drying the sludge under vacuum at a low temperature while blending with an absorptive, animal-edible bulk carrier solid in volumetric proportions from about 1:4 to 1:1 parts carrier to sludge solids to produce an animal feed supplement as a dry particulate solid.

3 more elements

Dependencies are inferred from the claim text.