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An oil skimmer is a machine that separates a liquid from particles floating on it or from another liquid. A common application is removing oil floating on water. These technologies are commonly used for oil spill remediation but are also commonly found in industry. They were used to great effect to assist in the remediation of the Exxon Valdez spill in 1989.

Oil skimmers are commonly found in three types: weir, oleophilic, and drum:

  • Weir skimmers function by allowing the oil floating on the surface of the water to flow over a weir. The height of the weir may be adjustable. These devices will collect water when oil is no longer present. Weir skimmers are also available in floating, self-adjusting variations. These models allow them to be effectively used even in changing water levels.
  • Drum skimmers function by using a rotating element such as a drum, to which the oil adheres. The oil is wiped from the surface of the drum and collected. They are very efficient and do not pick up any appreciable amounts of water even when oil is not present.
  • Oleophilic skimmers are distinguished not by their operation but by the component used to collect the oil. Ropes, discs, or drums are treated with a substance or otherwise manufactured to adhere to oil.

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