Oil-water separation methods mainly include gravity separation, centrifugal separation, electric separation, air flotation separation and so on.

Gravity separation: due to the relative density of oil, gas and water are different, the components of a certain oil-water mixture at a certain pressure and temperature, when the system is in equilibrium will form a certain proportion of oil, gas and water phase.

Centrifugal separation: the use of different densities of oil and water, so that the high-speed rotation of the oil-water mixture to produce different centrifugal force, so that the oil and water separation.

Electrical separation: electric evaporation as the final means of oil and water treatment in the oilfield and refineries are widely used, the principle is that the emulsion is placed in a high-voltage AC or DC electric field, due to the role of the electric field on the droplets, weakening the emulsion of the interfacial membrane strength, promote the collision of water droplets, merger, and ultimately agglomerate into a larger size of the droplets, from the crude oil to separate out.

Air flotation separation: air flotation is relying on the formation of tiny bubbles in the water to carry floc particles up to the surface of the liquid so that a method of water purification. The condition is attached to the oil droplets on the bubble can form oil and gas particles.

Expanded Information

Cabin bilge water is oily sewage mixed with water leaking from various valves and pipelines in the cabin and the lubricating oil leaking from the machine in operation, the main and auxiliary engine fuel oil and the overflow oil when moving the oil, and the oil sewage generated by the machinery and the cabin non-slip iron plate when washing and scrubbing. Cabin bilge water is prohibited from being discharged directly outboard, generally collected by sewage pumps to the sewage chamber, and then separated by the oil-water separator, in which the dirty oil is discharged to the dirty oil tank. Reach the standard of clean water discharged into the sea, can also be discharged through the standard discharge connector to the port reception facilities.