Oily Water Treatment

The treatment of waste water is strictly controlled by national and international laws. Waste water may only be discharged after prior de-oiling with specially approved treatment systems. The maximum oil content must not exceed 15 ppm. The limit has even been reduced to 10 ppm in some areas.

Protect the Environment

Oily water may only be discharged if the oil content in the effluent is below 15 ppm. 15 parts of oil to one million parts of water seems small but GEA believes this is still too high. More­over, practice has shown that this value is not attained in many conventional plants under practical opera­tion conditions anyway. The further we can reduce this value, the greater the benefit for our environ­ment.

Waste water is a mixture of the following constituents:

  • Cooling water leakages
  • Fuel and lube oil leaks
  • Drainages from settling and sludge tanks
  • Effluent from various cleaning processes

The product (i.e. oily water without excessive emul­sion) is sucked up from the oily water tank and fed by the feed pump through the filter and pre-heater via the feed valve to the separator. During the start-up or ejection program it is led back into the oily water tank.

The product flows from above into the centre of the separator bowl. The heavy water phase is separated from the finest oil particles and then conveyed under pressure by a centripetal pump to the discharge.