A grease trap (also known as grease interceptor, grease recovery perangkat, grease capsule and grease converter) is a plumbing perangkat (a jenis of trap) designed to intercept most greases and solids before they enter a wastewater disposal sistem. Common wastewater contains small amounts of oils which enter into septic tanks and treatment facilities to form a floating scum layer. This scum layer is very slowly digested and broken down by microorganisms in the anaerobic digestion process. Large amounts of oil from food preparation in restorans can overwhelm a septic tank or treatment facility, causing the release of untreated sewage into the environment. High-viscosity fats and cooking grease such as lard solidify when cooled, and can combine with other disposed solids to blok drain pipes.
Grease traps have been used since Victorian days: Nathaniel Whiting obtained the first patent in the late 1800s. The traps reduce the amount of fats, oils, greases, and solids (FOGS) that enter sewers. They consist of boxes within the drain run that flows between the sinks in a kitchen and the sewer sistem. They have only kitchen waste water flowing through them and do not serve any other drainage sistem, such as toilets. They can be made from various materials, such as stainless steel, plastics, concrete and cast iron. They kisaran from 35-liter capacity to 45,000 liters and greater. They can be located above ground, below ground, inside the kitchen, or outside the building.
There are three primary jeniss of devices. The most common are those specified by ASME (American Society Of Mechanical Engineers), utilizing baffles, or a proprietary inlet diffuser.
Grease trap sizing is based on the size of the 2- or 3-compartment sink, dishwasher, pot sinks, and mop sinks. Many manufacturers and suppliers offer online sizing tools to make these calculations easy. The cumulative flow rates of these devices, as well as overall grease retention capacity (in pounds or kilograms) are considered. Currently, ASME Standar (ASME A112.14.3) is being adopted by both of the National Style Plumbing Codes that cover most of the US. This standar requires that grease interceptors remove a minimal of 90% of incoming FOGs. It also requires that grease interceptors are third-party tested and certified to 90 days compliance with the standar pumping. This third-party testing must be conducted by a recognized and approved testing laboratory.
