Liquid purification or separation – Processes – Separating
Patent
1989-03-13
1990-10-30
Fisher, Richard V.
Liquid purification or separation
Processes
Separating
210791, 210800, 210805, 210808, 210346, 210486, B01D 4504
Patent
active
049667181
ABSTRACT:
The cross flow filter method includes an open tank having a first liquid retaining section, a second filter retaining section and a third solids collecting section in fluid communication with each other. A filter assembly is retained within the second section and includes a filter panel having a generally vertically disposed porous media surface. Filtrate is removed by applying very low vacuum pressure in communication with the filter panel such that filtrate is drawn through the pores of the filter media surface at a flow rate Q.sub.out. Fluid to be filtered is simultaneously cross flowing vertically downward across the filter media surface at a flow rate Q.sub.x, such that the horizontal velocity V.sub.h of fluid drawn through the filter media surface is very slight with respect to the vertical velocity V.sub.v of the cross flowing unfiltered fluid. The high velocity cross flowing unfiltered fluid imparts force and velocity to particles in the cross flow stream, thereby carrying the particles past the filter media surface without allowing the particles to adhere to the media surface. Excess unfiltered cross flowing fluid is recirculated between the first and second sections of the tank, while allowing entrained particles to settle to the solids collecting section of the tank as the recirculated fluid mixes with incoming unfiltered fluid prior to recirculation and discharge vertically downward across the filter media surfaces.
REFERENCES:
patent: 3635343 (1972-01-01), Holland
patent: 4085051 (1978-04-01), Kaminsky et al.
patent: 4116838 (1978-09-01), Lazzarotta
patent: 4213861 (1980-07-01), Muller et al.
patent: 4468319 (1984-08-01), Laaksa
patent: 4519903 (1985-05-01), Johnson
patent: 4579656 (1986-04-01), Johnson
patent: 4790935 (1988-12-01), Johnson
Fisher Richard V.
Millard Wanda L.
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