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A centrifugal water–oil separator, centrifugal oil–water separator or centrifugal liquid–liquid separator is a device designed to separate oil and water by centrifugation. It generally contains a cylindrical container that rotates inside a larger stationary container.
OTS's largest machine, the V20, can clean up to 210,000 US gallons (790,000 L) of oily water per day. On July 8, 2010, OTS reported it had 9 centrifuges deployed in the Gulf of Mexico, with 23 additional machines under construction and scheduled for shipment to Louisiana by the end of August 2010.
Each has different oil separation capability and are used in different industries. Oil water separators are designed and selected after consideration of oil separation performance parameters and life cycle cost considerations. "Oil" can be taken to mean mineral, vegetable and animal oils, and the many different hydrocarbons.
Large industrial centrifuges are commonly used in water and wastewater treatment to dry sludges. The resulting dry product is often termed cake, and the water leaving a centrifuge after most of the solids have been removed is called centrate. Large industrial centrifuges are also used in the oil industry to remove solids from the drilling fluid.
High-speed or superspeed centrifuges can handle larger sample volumes, from a few tens of millilitres to several litres. Additionally, larger centrifuges can also reach higher angular velocities (around 30,000 rpm). The rotors may come with different adapters to hold various sizes of test tubes, bottles, or microtiter plates.
The first liquid-liquid centrifugal contactor was invented by Walter Podbielniak [3] with the patent filed in 1932, then a series of developed models which were and continue to be used for whole variety of processes including solvent extraction of minerals and the purification of vegetable oils, but notably for the production of penicillin in World War II.