Cut & Pump

The efficient reduction and removal of solids is critical in food waste applications.

 

As seen in Pumps & System Magazine, January 2013. Click to read full article...

Effective solids handling is paramount in achieving a free-flowing food waste disposal system. As in any process in which solids and debris are present in a liquid stream, food waste can be a particularly challenging medium for pumps and other process equipment to handle without properly conditioning the liquid. Properly conditioned liquids will be homogenous in consistency, and any floatable solids will be reduced to a size that is compatible with downstream pumps, process components and dewatering devices. Any hard foreign objects will have been captured and removed from the liquid stream before contacting downstream components.

It is often not realistic to properly condition the liquid in one step. Cut & Pump is a complete solids handling system composed of multiple grinders and a positive displacement rotary lobe pump to provide flow. In food waste handling, two major designs are commonly specified—the twin-shaft solids grinder and the inline macerator. Depending on the waste being processed, one design may be better suited than the other. In some cases, a combination may be the most effective choice. In the most challenging scenarios, solids can be reduced in steps through a series of grinders, ranging from coarse to fine. Moving from left to right in the drawing below, the first component that the liquid encounters is a twin-shaft grinder. This device reduces large, solid objects to a size suitable for the inline macerator to reduce to a designated size. The twin-shaft grinder, in this case, would provide a coarse grind to reduce the solids somewhat closer to their intended final size.