McLanahan Corporation

Manure Separation

Manure Separation and Dewatering is widely used in the dairy industry as a means of managing nutrients and creating beneficial byproducts for the dairy. The manure separation process essentially creates two products. The first product consists of the larger manure fibers that are mechanically removed. Depending on the process used, these fibers can still contain a significant amount of moisture, ranging from a high of 90% to a low of 70% depending on the equipment used. To remove more moisture from these fibers, a second dewatering step is sometimes added. The second product produced in the separation process is the liquid portion. This portion contains the remaining small fibers and water. It also generally contains the bulk of the nutrients as well. Manure separation equipment helps the dairy manage their manure to suit their needs.

How Manure Separation and Dewatering Works

McLanahan designs and manufacturers several different machines for Manure Separation and Dewatering. Despite the differences in design, they all function pretty much the same way. In all cases, manure is pumped to the Separator, which contains a wedge wire, mesh or perforated screen. This screen captures a portion of the larger fibers while allowing the smaller fibers and water to drain through.

A Rotary Drum essentially thickens the manure, discharging at about 88% moisture content. If more dewatering is needed, a Roll Press can be used to squeeze the water from the thickened fibers. Rotary Drums and slope screens are well-suited for dilute slurries because of their large screening surface areas.