Method and device for separation of a suspension by means of a cross-flow filtration into a concentrate and a filtrate

Abstract

The invention relates to a method and device for separation of a suspension by means of a cross-flow filtration into a concentrate and a filtrate. The suspension is introduced into a suspension chamber with a plurality of chamber-like modules arranged in series, in each of which an annular separating element with a separating surface is provided, in each module, at least one stirring member with radially arranged stirring elements in the suspension chamber moves a small distance over the separating surface relative thereto, so that a directed flow transverse to the separating surface is produced in a gap between the stirring member and the separating surface. A differential pressure is set between the suspension chamber and a filtrate chamber for filtering, the filtrate, which penetrates the separating element due to the differential pressure, is derived via a filtrate pipeline while the remaining suspension in the suspension chamber is concentrated to be a concentrate which is derived from the suspension chamber via a drain. A screen is used as a separating element, which has a mean pore size greater than the average particle size of the solid in the suspension, on which a permeable target particle layer is targetedly filtered, which is designed for separation of particles or for producing a pure filtrate.

Description

technical field [0001] The invention relates to a method according to the invention for separating a suspension into a concentrate and a filtrate by means of cross-flow filtration. [0002] In this method, the suspension is introduced into a suspension chamber, which has a plurality of chamber modules arranged in series, in each of which at least one annular separation element with a separation surface is arranged, each In each module, at least one stirring mechanism with radially arranged stirring elements moves in the suspension chamber above the separating surface with a small distance relative to the separating surface, so that in the gap between the stirring mechanism and the separating surface, a force transverse to the separating surface is generated. Oriented flow, for filtration, a pressure difference is established between the suspension chamber and the filtrate chamber, which is on the side of the separation element facing away from the suspension chamber, and the f...

AI Technical Summary

Problems solved by technology

However, such membranes are limited in application due to chemical intolerance, easy abrasion and temperature sensitivity

Filter cakes growing in suspension, very fine particles or impurities (e.g. very large molecules) can gradually lead to an increase in filtration resistance and filter elements can become clogged, thereby reducing the flow through of the filtrate

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