Process for recovering nutrients from cattle manure

A process for making a nutritious additive for cattle feed from cattle manure or feed lot cattle manure, which comprises:

• Forming a slurry of the manure in an excess of water;
• basifying the slurry;
• centrifugally separating the liquid and solid portions of the slurry;
• subjecting said liquid portion to the action of FeCl.sub.3 to flocculate proteins;
• centrifugally separating flocculated proteins from the liquid carrier to form a first portion of the cattle feed additive;
• acidifying the slurry solid portion with H.sub.2 SO.sub.4 ;
• increasing the temperature of the acid treated slurry to above 250.degree. F. while maintaining the pressure thereof in the range of 25-75 psi;
• agitating the heated pressurized slurry to rupture the solid portion thereof;
• treating the hot slurry with calcium oxide;
• and
• condensing the hot slurry to form a syrup including sugars and amino-saccharides which is a further portion of the cattle feed additive.

A process for recovering nutrients from cattle manure and cattle manure from feed lots, which comprises:

• shredding the manure;
• mixing the shredded manure with water while maintaining the pH value between 8.1 and 8.5;
• passing air through the manure-water mixture for effecting thorough mixture thereof;
• centrifugally separating the liquid and solid portions of the manure-water mixture;
• precipitating protein constituents from said liquid portion;
• centrifugally separating protein containing gelatinous material from the liquid portion;
• raising the temperature of the precipitated gelatinous material to above about 250.degree. F. to form a sterilized dry mass of protein containing material;
• and
• basifying the protein stripped liquid portion to a pH range of 5.8 to 6.2 for refluxing in the process.