Oil traps (separators)
The devices are intended for the separation and/or trapping of petroleum products from surface (rain) and industrial wastewater. The oil traps operate based on the principle of gravity, separating heavier water from lighter oil products. Oil traps must be installed in every petrol station, car wash, parking lot or any other facility where leaks of oil products may occur. The most important thing is that the level of contaminants in the water after treatment shall not exceed 5 mg/l. All oil traps must have CE marking.
Principle of operation
The concentration of petroleum products in the incoming water can reach up to 2300 mg/l and 50 mg/l before the sorption filter. Contaminated wastewater is treated up to 1 mg/l of petroleum products by going through a settlement tank, coalescing filter and sorption filter with sorbent filler (NKS) or coalescing and sorption filter (KS), and up to 5 mg/l of oil products through a settlement tank and coalescing filter (NK). First of all, the water stream is calmed allowing sand and other heavy particles to settle out of water; then the coalescing filter traps the sludge and separates the petroleum products from the water; lastly, the contaminated water is purified by filtering through a sorption filter filled with sorbent material.
Types of separators:
Oil separator with grit chamber.
Oil separator without grit chamber.
Portable oil separators.
Underground oil separators.
Vertical and horizontal oil separators.
The disadvantage of a separator without a grit chamber is that it fills up faster, because it traps both petroleum products and sand and earth (this is especially important if the separator is to be used to serve larger outdoor areas). As a result, the trap will need to be pumped out more often, and pumping out is a paid procedure.