What is the primary function of a grease trap?

The primary function of a grease trap is to separate and store oil and grease that are found in wastewater. As wastewater flows into the grease trap, the design allows for the lighter materials, such as fats, oils, and grease, to float to the surface while heavier solids settle to the bottom. This separation is crucial in preventing grease and oils from entering the main sewage system, where they can cause blockages and other issues, particularly in municipal wastewater treatment facilities. Proper functioning of a grease trap helps maintain the overall efficiency of the plumbing system and prevents costly repairs and environmental issues that can arise from grease accumulation.

The other choices do not accurately represent the function of a grease trap; thus, they are not suitable options. For example, while filtering solid waste is related to wastewater treatment, it does not specifically involve the separation of grease and oil. Similarly, a containment unit for hazardous materials and a device for purifying drinking water serve entirely different purposes and are not relevant to the handling of grease in wastewater systems.