What is the function of a grease interceptor (gravity)?

A grease interceptor, also known as a grease trap or grease separator, specifically functions to separate fats, oils, and grease (FOG) from wastewater. This separation is crucial in preventing these substances from entering the sewer system, where they can cause clogs and other issues in the plumbing system and wastewater treatment facilities. Grease interceptors achieve this by utilizing gravity; as wastewater flows into the interceptor, the lighter fats and oils rise to the surface while heavier solids settle to the bottom. This design allows for effective capturing and collection of FOG, which can then be properly disposed of, rather than being washed into the sewer where they would lead to significant maintenance challenges.

The other choices do not align with the primary role of a grease interceptor. For example, while removing solids from wastewater is important for sanitation, that responsibility falls to other types of filtration systems, not specifically a grease interceptor. Filtering drinking water is a completely different process and is not related to wastewater management. Lastly, preventing backflow is a function of backflow prevention devices, which are designed to maintain pressure and prevent wastewater from flowing backward into clean water systems. These functions highlight that each component in plumbing systems serves distinct purposes essential to maintaining safe and effective wastewater management.