Grease tank

Agents Seminar
Bio-treatment of grease tanks
Antoine ULRICH
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BWT green offer
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Grease tank
Separators without treatment!!!
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Grease tank
Grease tank / Separator
Drain
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Grease tank
Grease tank / Separators
To drain
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Grease tank

Oils and greases separator (FOG = fats / oils / greases):

Separation of oils and greases that float, by slowing down the flow rate.

Only 1 tank or unit with pre-separation. Units with several tanks also exist.
The solution leaving a restaurant kitchen contains
Water + food residue + detergents + greases
Drain pipe wall surfaces provide a support for the
micro-biological development and storage of organic
matter (greases – food)
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BACTER GT
Composition:
– Optional aerobic and anaerobic micro-organisms
– Micro-nutriments and stimulants
 Increases growth in many environments
– Enzymes
 Enhance the breakdown of starches and greases
 Limit the development of filamentose that causes foaming
Operates in environements that are variable in terms of oxygenation (aerobic, anoxic)
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The process …

Cells absorb nutriments by
phagocytosis

They digest the nutriments
depending on their breathing
process

The residue is released (organic
matter, water, CO2)

Oxygen is needed!!!! (aeration
is often needed in the first tank)
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Le process
O2
Carbohydrates + FOGs

Carbohydrates and FOG are
digested in the presence of oxygen

Cellular
respiration
The oxidation of lipids leads to the
production of ATP
ATP
energy

Cellular multiplication

In favorable conditions (oxygen,
nutriments), populations are
Small chain fatty acids +Water + CO2
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doubled every 30 – 60 minutes
Grease tanks: Customer advantages

Customer problems related to grease tanks:
–
–
–
–
Formation of a cap of fatty matter
Frequent scraping
Unpleasant smells
Release of greases into the public water system

Solution: colonize the upstream pipes and the tank.

Dosing
– Start application after a scraping
– Application: with a dosing pump, upstream of the tank
– Initial dose: 1.5 l/m3 of tank
– Continuous dosing from 10 to 20 ml/m3, as a function of incoming flow rate
– Or dosing at intervals (if regular disinfections):
Volume of grease tank:
1 to 5 m3
0.5 l/day
5 to 10 m3
1 l/day
10 to 15 m3
1.5 l/day
More than 15 m3
2 l/day
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Questions?
I’m hungry,
Sell me!!!
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