Process for treating animal waste

A process for treating poultry manure to transform same to a material suitable for use as a feedstuff for animals, which comprises the steps of:

• carrying out the following steps A and B in optional sequence,
• A. mixing poultry manure with an acid to neutralize the ammonia in the poultry manure, to change the pH of the poultry manure to less than 7.0 and to leave present in the poultry manure a catalytically effective amount of the acid, the acid being stable, non-toxic to animals and free of elements that cause bad taste and are unsatisfactory for animal nutrition, the mixing being carried out for a period of time effective to form a substantially uniform homogeneous mixture of said poultry waste and said acid,
• B. mixing into the poultry manure an amount of formaldehyde-supplying substance effective to kill essentially all the pathogenic bacteria present in said poultry waste, the mixing being carried out for a period of time effective to form a substantially uniform homogeneous mixture of the poultry manure, the acid and the formaldehyde-supplying substance,
• C. then mixing into the product from both of steps A and B, granular urea in an amount at least sufficient to react with the residual formaldehyde in the product of step B, to form urea-formaldehyde condensation products therein, and
• D. drying the product of step C to a moisture content of less than about 15 percent.