Wastewater flowing from restaurants or other types of commercial facilities that produce fats, oils, and grease are required to have a grease trap or multiple grease traps in line to the sewer system. Grease traps are designed to intercept the flow of FOG (Fats, Oils, and Grease) to the wastewater treatment plants who do not want this product in their waste streams. They are 70-90% effective in capturing the FOG.
These grease traps/interceptors are usually about 1,200 gallons in size constructed of concrete or plastic and are installed underground just outside the commercial facility using them, sometimes in series of 2 or 3 tanks as required. Grease traps are always full except just after pumping. As the wastewater flows in it impacts against an inlet tee designed to decrease stirring up the wastes in the tank. As wastewater flows in, an equal amount flows out the other side through the outlet and on through the sewer system. In between is a baffle in the tank which keeps most of the solids and floating scum on the inlet side of the tank.
Grease traps are required to be pumped and cleaned every three months at least, and a hauler manifest must be completed accurately on every occasion to keep in compliance with city, county, and state regulations. See our Compliance section for more details.