Grease Interceptor

Gravity Grease Interceptors (GGI), also commonly known as a grease trap, work on the buoyancy principle. Animal fats and vegetable oils (grease) are 10 to 15 percent less dense than water and will float on top of water. When wastewater enters a grease interceptor, the velocity is reduced enough that wastewater is given time to cool and separate into 3 layers. Grease rises to the top inside the interceptor and is trapped using a system of baffles. Solids settle at the bottom, and the separated clear water escapes under an outlet baffle. Grease interceptors can also have strainers for collecting solid debris, which reduce the amount of solids that settle at the bottom of the interceptor. Over time, solid and grease build‐up will accumulate in the grease interceptor. A routine cleaning schedule will ensure maximum performance of each interceptor.​