Liquid purification or separation – Processes – Separating
Patent
1982-04-08
1983-10-04
Therkorn, Ernest G.
Liquid purification or separation
Processes
Separating
210784, 210791, 210798, 210193, 210217, 210391, 210404, B01D 3702, B01D 3306
Patent
active
044077203
ABSTRACT:
A fully submerged rotatable drum type of filter has a perforate cylindrical surface through which contaminated liquid is pulled by a suction pump. The inner periphery of the drum is sub-divided into numerous narrow, shallow, elongated chambers open at one end for communication with a main chamber which conveys filtered liquid to a port in the non-rotatable tube upon which the drum is rotatably mounted. A backwashing system for cleaning the perforate surface of the drum comprises a non-rotating channel which establishes sliding and sealing contact with a limited number of the open ends of the peripheral chambers to cause pressurized filtered backwashing liquid to flow into such peripheral chambers to remove filter cake from the perforate surface by the reverse flow therethrough. Filtration can therefore proceed through a majority of the peripheral chambers simultaneously with the backwashing operation through the limited number of peripheral chambers in communication with the backwashing system. A filter aid precoating system can optionally be used to apply a precoat to the perforate surface of the drum at a point on its circumference immediately after the backwashing station.
REFERENCES:
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patent: 2567266 (1951-09-01), Young
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patent: 3794178 (1974-02-01), Luthi
patent: 3814259 (1974-06-01), Kamimura
patent: 4168234 (1979-09-01), Hutto
patent: 4186092 (1980-01-01), Stielau
patent: 4226716 (1980-10-01), White
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