B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/31, 182/98
B01D 17/04 (2006.01) B01D 33/00 (2006.01)
Patent
CA 1083976
ABSTRACT A method for filtering a liquid which consists of supplying a liquid to a filter bed and causing the same to move upwardly therethrough and, at the same time, continuously removing filter medium particles from the bottom of the bed to a wash device and allowing the removed particles to flow through the wash device downwardly counter-current to the flow of filtered liquid upwardly therethrough. The apparatus consists of a casing for confining the zone of filter medium particles in the lower portion providing a filter bed and for confining a zone of filtered liquid above the filter bed. Means are provided, such as an air pump, for continuously removing filter medium particles from the bottom of the filter bed and transporting the same upwardly therethrough to an upper portion of the casing and discharging the same into an open ended pipe of a wash device disposed in the upper portion of the casing. An outlet in the upper portion of the casing defines the upper surface of the zone of filtered liquid maintained above the filter bed. The pipe of the wash device has an open bottom end through which the washed filter medium particles are discharged onto the top of the filter bed and into which also the filtered liquid flows and upwardly through the wash pipe discharging at an elevation lower than the discharge of filtered liquid from the casing. A deflector is provided below the open bottom end of the wash pipe for spreading the washed filter medium particles on the top of the filter bed. The liquid to be filtered is supplied directly into the filter bed in the lower portion of the casing and at a higher elevation than the elevation from which the filter medium particles are removed continuously and transported to the wash device.
273000
Hjelmner Ulf R.
Larsson Hans F.
Johnson & Hicks
Rederiaktiebolaget Nordstjernan
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