For treatment of rain water from gas stations including vehicle fuel storage, vehicle manoeuvring areas, car parks, repair garages, roads, process waters in water recycling systems and open car washes. The device requires the use of a preliminary sedimentation tank.

The AWAS BK is a coalescence separator equipped with coalescent filter and automatic closure on outflow. The device is placed on a reinforced concrete, monolithic tank of concrete class B45, water resistance class W8 and frost resistance F150, protected from the inside with an oil-resistant film, with external surfaces insulated with water resistant substance. For installation underground. Can be fitted with a light-type cover, B class with 125 kN B manholes or heavy D-class covers with 400 kN D manholes. Internal equipment of a separator: Stainless steel fittings, coalescent insert, gaskets (oil-resistant rubber, e.g. Forsheda), automatic closure on the outflow with float tared for 0.85 g/cm3 density, connections for fitting PVC pipes.

Waste water containing petroleum derivative substances flows into the oil separator where it undergoes preliminary treatment. Separator uses the difference between the specific gravities of water, petroleum derivatives and settling particles. Owing to their lower density and weight compared to water the petroleum derivative substances automatically float to the surface of waste water in the separator where they are stored. The remaining amount of oil particles suspended in the waste water is additionally treated on the separator’s coalescent filter. Due to the coalescence effect the waste water containing oil particles flowing through separator filter form larger chunks that are elevated by a buoyant force to the separator surface where they are stored. A closure device is installed on the separator’s outflow to close the outflow from the separator if a significant volume of petroleum derivatives is accumulated. The closing float is tared so it floats on the water surface and drowns in substances with a density lower than water. When a layer of separated petroleum derivative substances with the defined thickness (maximum storage capacity of petroleum derivatives) is accumulated on the surface of liquid in the separator, then the float will immerse in the liquid, thus cutting off the outflow from the separator.

Additional equipment:

• alarm device.