What is a Grease Control Device?

Problems caused by waste from restaurants and other grease-producing establishments, have served as the basis for ordinances governing the discharge of grease materials to the sanitary sewer system. This type of waste has forced the requirement of the installation of preliminary treatment facilities, commonly known as a Grease Control Device (GCD). GCD’s include gravity grease interceptors (GGI’s), and hydromechanical grease interceptors (HGI’s), also known as grease traps.

Gravity Grease Interceptors (GGI) are usually larger (up to 2000 gallons), made from concrete, and located outside underground. Like HGIs, these interceptors are also designed to separate and retain FOG and solids while allowing the remaining wastewater to be discharged to the sanitary sewer.

HGI’s are typically small and located indoors. These devices are designed for separating and retaining the FOG and settled solids while allowing water to continue to flow at a designated flow rate into the sanitary sewer using gravity. Newer HGIs made from polycarbonate plastic are tested and rated to breakdown and retain a high capacity of grease.

Newer HGI’s and older model grease traps are smaller sized reservoirs built into wastewater piping typically a short distance from the grease producing area. This is normally an under sink box-shaped fixture located in the kitchen, though they can also be installed in the service area floor.  They typically have a liquid capacity of not more than 20-30 gallons. Reservoir baffles retain the wastewater long enough to allow the grease to solidify and rise to the surface. Building staff can then remove and dispose the grease properly, either in a building exterior grease collection tub, or in the trash. Due to the nature of this system being so limited in size, constant monitoring and maintenance an absolute must.

Show All Answers

1. What is FOG?
2. What are the negative impacts of FOG?
3. What is a Grease Control Device?
4. What is a gravity grease interceptor and how does it work?
5. What is hydromechanical grease interceptor and how does it work?
6. What is a Food Service Establishment (FSE)?
7. Do I need a grease control device?
8. Can you recommend a maintenance schedule?
9. Do I have to have any training on proper FOG handling procedures?
10. How can I get in compliance?
11. Do I have to keep any records?
12. What if I don’t install a grease control device?
13. How does the JCSA ensure compliance?
14. Are there any fees or penalties for non-compliance?
15. What are the criteria for inspecting grease control devices?
16. What about using my garbage disposal or use detergent to wash it down the drain?
17. What is the JCSA doing about educating the public?