A fat separator is an underground tank customized according to the size of the business and in accordance with the requirements of the Ministry of Health and the Ministry of Environmental Quality. It is where all the sewage lines from the kitchen are separated, and after the separation, the liquid is either fatty or clean. The clean liquid flows into the municipal sewage system, while the fatty residue remains in the tank and is removed by a private wastewater service.
In Israel, there is a requirement for any restaurant, catering service, food production facility, or kitchen that consumes more than 5 cubic meters of water per day to install a fat separator before discharging wastewater into the municipal sewage system. This is done to capture the fats and solids from the wastewater.
So how do you calculate the volume of a grease trap?
The Ministry of Environmental Protection offers a formula (according to the EN 1825-2:2002 standard) for calculating the size of a conventional grease trap to customize grease separators for businesses based on the number of meals served per day.
– The nominal volume of the grease separator is calculated in liters per second.
– The maximum wastewater flow rate entering the grease separator is measured in liters per second.
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Typical flow rate (liters)
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The type of kitchen
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|
22.8
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Commercial with dishwashing
|
|
19.1
|
Commercial without dishwashing
|
– Inlet Flow Temperature Impact Factor
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The temperature factor.
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The temperature of the wastewater at the inlet to the separator [°C].
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|
1.0
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≤60
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|
1.3
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>60
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– Relevant Fat/Oil Type Density Factor = Number of Meals Served during Peak Hours
– Detergent and Cleaning Agents Influence Factor
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The cleaning material factor (fr).
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The frequency of using cleaning materials.
|
|
1.0
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No usage.
|
|
1.3
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Sometimes or always.
|
|
≥1.5
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Special cases (e.g., hospitals).
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The relationship between a grease separator and the average number of meals served per day in a typical restaurant is as follows:
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גודל המפריד
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נפח כולל במ"ק
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נפח מים בליטר
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נפח שומן בליטר
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נפח פעיל בליטר
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מספר הארוחות ביום
|
|
2000
|
2157
|
1423
|
285
|
1708
|
280
|
|
3650
|
3737
|
2474
|
495
|
2969
|
400
|
|
5300
|
5318
|
3525
|
705
|
4230
|
400-700
|
|
6900
|
68988
|
457575
|
915
|
5490
|
700-900
|
The business owner must not discharge oil/grease into the municipal sewage system. It is mandatory to have a certified grease separator installed according to legal requirements. Additionally, the business should retain disposal and reception certificates for a period of three years.
BFOOD office will assist you in the calculation and submission process to the Food Services/Health Ministry. Contact us to get a price quote for advancing your case