Wisconsin DNR Wastewater Operator Certification Practice Test

What is the purpose of a grease interceptor in a wastewater system?

To remove fats, oils, and greases before they enter the sewer, preventing blockages and odors. To increase flow velocity in the sewer mains. To remove dissolved minerals from the wastewater. To measure flow in the sewer line.

Correct Answer:

To remove fats, oils, and greases before they enter the sewer, preventing blockages and odors.

Explanation:

Grease interceptors are designed to remove fats, oils, and greases from wastewater before it enters the sewer system. They work by allowing lighter fats to float to the surface while heavier solids settle, capturing the FOG so it doesn’t travel downstream to cause clogs or generate odors in the sewer or manholes. This is especially important in commercial kitchens where FOG loads are high. Regular maintenance is needed to remove the accumulated grease and solids for continued effectiveness. The interceptor doesn’t speed up flow, remove dissolved minerals, or measure flow—those are not its functions.

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