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Abstract

A practical precipitation recovery process for food waste sludge from dissolved air floatation (DAF) units and sugar by products is provided. Typical meat DAF (dissolved air floatation) skimming sludge has about 12% solid with about 40% fat and 42% protein in solid basis. The skimming sludge is often for land application to cause a pollution problem. Much of the potential nutritive value of the skimming is lost through microbiological degradation. The process converts the skimming sludge and animal blood into a precipitate, which binds most nutrients. Then the precipitate product can be separated easily by a centrifuge, screen or press process. The dry process cost can be reduced because the extra water is removed and the product surface area is increased. The process can convert the waste skimming sludge into a value added product as a good and safe ingredient for feed and nutritional applications. A typical dry product has about protein 54%, pepsin digestible protein 96%, fat 23%, ash 8.5%, moisture 6%, very low levels of aerobic plate count, total coliforms, staphylococcus aureus, yeast and mold, undetected E. coli and negative salmonella. This process can also be used to improve the properties of animal feed block products. If the precipitation process can be scaled up into commercialization production, the process could save and create millions of dollars for food and feed industries every year.

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