How does a commercial grease trap work?

How does a commercial grease trap work?

Commercial Grease Trap

Commercial Grease Traps are used mainly in commercial kitchens to separate the oils, grease and solids and intercept them before they enter the waste disposal system. This is a very important piece of equipment in a commercial kitchen. The grease and oils that are used in a commercial kitchen are in huge amounts compared to those that are used elsewhere. Generally what happens is when oils and grease are used in smaller amounts elsewhere; they enter the septic tanks or sewage treatment facilities to form a layer of scum. This then reacts naturally with microorganisms and is slowly broken down and digested in an anaerobic digestion process. However when the oils are in larger amounts, like from a commercial kitchen they do not get digested naturally and can cause untreated sewage waste to enter the environment and even cause blockages in the pipe systems. To avoid all of this commercial kitchens have a grease trap. Commercial Grease Traps are used to limit the amounts of fats, oils and grease (FOGs) to enter the waste disposal systems.

Types of Grease Traps & How they Work

Commercial Grease Traps are used in large institutions that house commercial kitchens. There are generally three types of Commercial Grease Traps that are used in these commercial kitchens.

Small Point of Use Grease Traps

The first type of grease traps are Small Point of Use Grease Traps and are a very common type of grease traps that are smaller in size which are used in commercial kitchen. These are grease traps that are attached to the output lines of equipment or devices in the kitchen. These liner grease traps restrict the flow of FOGs upto 85 to 90%. The way it works is they trap and store the FOGs that come into these devices before the waste flows out into the waste disposal system.

Grease Interceptors

The second type of grease traps are larger in ground tanks that are also called Grease Interceptors and are used for commercial kitchens that cater to large operations. These are 500 gallons to 2000 gallons tanks that cater to large portions of waste from large commercial kitchens. In grease interceptors what happens is that a large specified quantity of waste is collected into the grease interceptors that are often made of steel, concrete or fiberglass.

The waste is accumulated into the grease traps and then it is allowed to settle for some time. After this what happens is that the FOGs float to the top while the solids settle to the ground in the grease traps. Then the FOGs on top are removed and grease free waste water is allowed to flow out of the Grease traps into the waste disposal or sewage system.

Grease Recovery Devices:

Sometimes commercial kitchens use grease recovery devices which remove the surface grease directly when it is trapped.

The above were various forms of commercial grease traps and how each one works to remove grease oils and other fats from the waste before it reaches the waste disposal or sewage systems.

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