Microfiltration system with swirling flow around filter medium

Liquid purification or separation – Processes – Separating

Patent

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Details

Other Related Categories

210777, 210803, 210315, 210436, B01D 2126, B01D 2700

Type

Patent

Status

active

Patent number

055001343

Description

ABSTRACT:
A method and apparatus for separating particles from liquids is disclosed. The apparatus comprises a generally cylindrical swirl chamber with a generally axially symmetric shape, and a porous filter element positioned coaxially inside the swirl chamber. The porous filter is preferably composed of a plurality of porous tubes. The liquid to be treated is forced into the swirl chamber through tangential injection slits extending along most of the height of the chamber, which generate a vortex flow inside the swirl chamber and around the porous filter element. Particle-free liquid permeates across the porous filter, flows along its interior, and is collected at a filtrate outlet port. The remaining liquid, now having a higher particle concentration, flows out of the apparatus and can be separately collected, or recirculated back to the apparatus for further separation. The swirling flow retards particle motion toward the filter element thus minimizing buildup of a cake of particles on the porous filter medium. The swirling flow also enables increased shear along the filter medium, reducing cake formation. In addition, the swirl produces a favorable stratification in the cake that tends to reduce the cohesion of the cake. The slits are designed to enforce similar flow conditions in all sections of the swirl chamber, thereby preventing uneven loading of the filter element and particle accumulation at the bottom of the chamber. The flow is periodically interrupted, causing the cake to be partially removed. These mechanisms enable attainment of much higher flow rates of effluent liquid than conventional cross flow filtration systems.

REFERENCES:
patent: 4253959 (1981-03-01), Tafara
patent: 4293414 (1981-10-01), Gienneli
patent: 4313830 (1982-02-01), Tulin et al.
patent: 4379053 (1983-04-01), Bane
patent: 4597871 (1986-07-01), Okouchi et al.
patent: 4994887 (1990-07-01), Frederick
patent: 5273665 (1993-12-01), White

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