In commercial plumbing, what is the purpose of a grease trap?

The purpose of a grease trap is fundamentally to separate fats, oils, and greases from wastewater before it enters the sewage system. In commercial plumbing, especially in establishments such as restaurants and kitchens, food preparation activities generate a significant amount of greasy waste. If this greasy waste were to flow directly into the sewage system, it could cause blockages and other plumbing issues, leading to costly repairs and environmental concerns.

A grease trap functions by allowing wastewater to enter the tank where the heavier solids settle at the bottom, while the lighter fats, oils, and greases rise to the top. This separation process enables the greasy substances to be contained within the trap, preventing them from contaminating the municipal sewage lines. Regular maintenance and cleaning of the grease trap are necessary to ensure that it operates effectively and continues to protect the plumbing infrastructure.

In contrast, options focusing on filtering heavy metals, collecting rainwater, or facilitating rapid drainage do not accurately pertain to the primary function of a grease trap, which is specifically designed for managing fats and oils in wastewater systems. Therefore, the selected answer highlights the essential role that grease traps play in maintaining the integrity of plumbing systems in commercial settings.