Applications are industrial sites where rain or wash down water can wash spilt oils into storm
drains as well as food processing factories, metal working and plating industries.
Although the free oil, will if allowed to stand, naturally float and separate from the water
the results are poor and can take a very long time. The EfloSEP uses tilted plates as well as
oleophylic coalescing media to achieve a treated water with around 20 mg/l oil in water.
Further polishing using absorption process can achieve even better results.
All EfloSEP units are available as package, steel fabricated systems in a range of capacities from 50 m3 per day to 2300 m3 per day.
Multiple units in parallel can be employed for greater capacities.
The EfloSEP is not an in-ground interceptor found under garage forecourts.
These are grp tanks with two or three compartments and exclude all of the tilted plate & coalescing technology, resulting in a cheaper product but poorer performance.
The first stage of EfloSEP are the tilted plates and these will remove 99.9 % of 50 micron free oil
droplets of an SG of 0.86 or below from water with an SG of 1.0 or above. A significant proportion of
the smaller oil droplets will be removed in the second stage using coalescing media.
It is most common to use the EfloSEP ahead of other water treatment processes.
The reason for this is that oily waters will contain both free oils and emulsified oils.
Oil and water emulsions are created either mechanically by high speed pumps or by chemical addition.
They can also occur more naturally in produced water from oil extraction.
Free oils are captured first using the EfloSEP but the emulsified oils will pass through the EfloSEP.
In order to separate the emulsified oils from the water flow, a further step will be required to break the emulsion.
Generally this is done using an EfloDAF dissolved air floatation plant. Information on both the EfloDAF
the Industrial Waste Water page.