A system for recovering nutrients from animal byproducts includes a grinder, a separator, and a dehydrator. The grinder is adapted to reduce the animal byproduct into smaller particles. The separator is adapted to separate the animal byproduct into water, oil and solids. The dehydrator is adapted to dry the solid material of the animal byproduct. A method for recovering nutrients from animal byproducts includes grinding animal byproduct material, separating protein from the animal byproduct material to produce a meal, and drying the meal.
An improved vertical aeration system is provided for a grain bin having a sloped hopper bottom with a discharge opening. A pyramid frame includes legs with lower ends attachable to the hopper bottom. Concave perforated walls are attached to the legs. Braces extending between the legs provide structural support for the walls. An air duct extends upwardly and centrally into the interior of the frame, to supply air into the aeration system for flow outwardly through the perforated walls.
