What is the primary function of a grease interceptor/separator in a commercial kitchen?

The primary function of a grease interceptor or separator in a commercial kitchen is to separate fats, oils, and greases (FOG) from wastewater before it enters the sewer system. These substances can cause significant blockages in the plumbing and municipal sewer lines, leading to costly repairs and potential environmental damage. The grease interceptor operates on the principle of density separation; because fats and oils are lighter than water, they float to the surface in the interceptor and form a layer on top. As wastewater flows through the device, the FOG is collected, allowing cleaner water to exit and flow into the sewer system.

This function is critical in commercial kitchens where food preparation often produces significant amounts of grease and fat. By effectively capturing these materials, grease interceptors help maintain sanitary conditions, reduce the risk of sewer backups, and prevent harmful pollutants from entering water bodies.