Dealing With FOG in Onsite Wastewater Systems

FOG (fats, oils and grease) is a constituent of sewage, typically originating from food stuffs (animal fats or vegetable oils) or consisting of compounds of alcohol or glycerol with fatty acids (soaps and lotions), usually measured in mg/L.Sources of FOG Fat found in onsite wastewater treatment systems is animal fat, oil from vegetable and cooking oils, and grease from petroleum-based soaps. FOG is generally treated in onsite wastewater treatment systems by separating them from the wastewater stream. At high temperatures, FOG is in a liquid state, but as the temperature cools, the fats component will solidify (see table below). FOG can be trapped