AJM Environmental Services : : Boat Shaped Grease Arrestors / Grease Traps

|| Boat Shaped Grease Arrestors / Grease Traps || Determining The Size ||
|| Businesses Requiring Grease Arrestors ||

Determining the Size of a Grease Arrestor

Most food outlets and food services are required to install and maintain an adequately sized boat shaped grease arrestor / grease trap. The size of the grease arrestor / grease trap depends on the volume of greasy wastewater discharged and local authority requirements.

The following guidelines are those applied by Sydney Water in 2005. They maybe used as a guide, however in all instances final sizing determination should be sought from your local water authority.

Stand-alone Businesses

The Grease Arrestor must have a minimum capacity of 1,000 litres, with the final capacity equivalent to the volume of wastewater discharged in one hour at maximum flow. Restaurants, hotels and motels can determine the approximate grease arrestor size from the number of seats or beds on the premises.

For Example:

Max volume of Seats/Beds	Wastewater Discharged (Guide only in L/hr)	Grease Arrestor / Trap
1-69	1,100	1,000 Litres
70-199	1,500	1,500 Litres
200-399	2,000	2,000 Litres
400-599	3,000	3,000 Litres
600-799	4,000	4,000 Litres
800-1000	5,000	5,000 Litres

Shopping Centres

Communal grease arrestors / traps should have a capacity of 60 per cent of the estimated capacity of the combined stand-alone establishments.

This is the minimum requirement, although extra capacity should be provided in case non-food and unoccupied shops are converted to retail food businesses.

The maximum capacity for a grease trap is 5,000 litres, therefore premises need to be grouped to drain to separate grease traps where this requirement is exceeded or Dissolved Air Flotation unit installed where this is not practical.

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