ESK High Performance Coalescence Separator

Application
Cleaning of rainwater from petroleum derivative substances is the intended use of the ESK Separator. Equipment of this type can be used for treatment of rainwater coming from the areas that are highly exposed to contamination by petroleum derivative substances (e.g. fuel stations, fuel distribution stations, car servicing workshops, etc.) and those less exposed to the risks of this type (e.g. from roads, parking lots, manoeuvre yards, etc.). A suitable settling tank should be used upstream of the separator.

The separator can also be used for pre-treatment of process water coming from car wash stations (considering the specific nature of waste water of such a type when selecting the device). In such circumstances, a settling tank of much higher volume than in case of rainwater pre-treatment system should be used upstream the separator.

See PN-EN 858-2 standard for the required minimum volume of the settling tank that operates together with the coalescence separator for a variety of applications.

Principle Of Operation
Rain or process wastewater, cleaned from suspended matter comes to the ESK Separator. Separation of the petroleum derivative contamination occurs by gravitational separation of oil and water, which is supported by the coalescence effect of the media. Oil impurities lighter than water emerge to the surface where they are collected creating a film. Some small drops of the petroleum derivative substances without adequate buoyant force aggregate in bigger drops when flowing through the coalescence material (coalescence effect), which allows their gravitational separation. The submerged outlet prevents escape of the separated contamination downstream and provides resistance to encourage separation.

Recommended Application Of Use
The separator is to be supplied by gravitational inflow. When wastewater must be pumped, either the pumping station should be located downstream or an accumulator should be installed upstream the separator. Since the inside of the separator should be periodically inspected and cleaned, it is advisable to locate the unit outside any roads, parking lots, etc. Location of the unit should allow easy access of the vacuum trucks for performance of maintenance work.

When underground water level is expected to be above the device foundation then check the foundation stability conditions in the worst possible case, i.e. at the max. level of underground water with the separator emptied for cleaning.

Construction
The separator body is made of precast concrete. The ESK Separator is supplied with a precast and a minimum of a 36"sq Access Hatch. Both the structure and the access hatch may be supplied for any specified load rating as required by the project demands.

The body is made of concrete sections joined by grout up to the level above the inlet and outlet openings. The tank may be supplied if required to be resistant to other chemical pollutants or ground infiltration. There are internal fittings made of PE (i.e. inlet/outlet piping system) and stainless steel (i.e. the float guides, coalescence element supporting basket and float) installed inside the tank. The coalescence element is made of polyurethane foam of specific parameters.

The standard separator is fitted with the protection system, consisting of a float that prevents outflow from the separator when the volume of light impurities in the tank reaches its maximum value (storage capacity). The float is calibrated to density value of 0.85 g/cm3. The design prevents contamination of surface water with petroleum derivative substances or their escape to the stormwater system.

When the foundations of the equipment are to be located deep in the ground, then additional concrete sections are available to be built over.

Accessories: The separator can be equipped in the alarm system that informs the user that the petroleum derivative contamination collected in the tank is to be disposed.