Method and system for producing a fertilizer or herbicide from a whole stillage byproduct produced in a corn dry milling process

A method for producing a fertilizer or herbicide from a whole stillage byproduct produced in a starch containing grain dry milling process for making biofuel and/or a biochemical, the method comprising:

• separating the whole stillage byproduct into a thin stillage portion, including nitrogen-containing protein and sulfur-containing amino acids, and an insoluble solids portion;
• separating the separated thin stillage portion, via density, into a nitrogen-containing protein portion, including the sulfur-containing amino acids, and a water soluble solids portion, which includes free oil, wherein the nitrogen-containing protein portion, including the sulfur-containing amino acids, is not subsequently subjected to an evaporator;
• subjecting the water soluble solids portion to evaporation via an evaporator to yield a soluble solids portion, which includes the free oil;
• drying the nitrogen-containing protein portion including the sulfur-containing amino acids;
• recovering the dried nitrogen-containing protein portion, including the sulfur-containing amino acids;
• and
• mixing the recovered nitrogen-containing protein portion, including the sulfur-containing amino acids, with one or more other components prior to use as a fertilizer or herbicide,
• wherein the recovered nitrogen-containing protein portion and the one or more other components define the fertilizer or herbicide.