Filtration device having internal recirculation
AssigneeMicrodyn-Nadir GmbH
InventorsStefan Krause, Ulrich Meyer-Blumenroth
Life of this patent
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Abstract
A device for micro-, ultra-, or nanofiltration that includes one or more flat filter modules having flat filter elements arranged in parallel and at a distance from each other and gas injectors of one or more gas lifting systems for producing a circulating cross flow directed tangentially to the surface of the flat filter elements and having at least one rising area, in which the cross flow flows substantially vertically upward, and at least one falling area, in which the cross flow flows substantially vertically downward, in which the rising area flows through 10 to 100% and the falling area flows through 10 to 100% of an inlet-flow volume of the at least one flat filter module.
Claims27
A device for micro-, ultra- or nanofiltration comprising one or more immersed flat filter modules, said modules comprising (i) flat filter elements arranged in parallel and at a distance from one another, (ii) one or more gas lifting systems comprising gas injectors having more than one gas outlets for generating a continuous circulating crossflow stream directed tangentially to the surface of the flat filter elements and (iii) at least one permeate line connected to said flat filter elements for passage of permeate into a permeate space,
- said module comprising at least two side walls having at least two side walls,
- wherein said module having a horizontal cross sectional are A·F of length A and width F, and
- wherein the gas injectors are tubular hollow bodies, each gas injector having a longitudinal axis substantially in a horizontal plane that is oriented in a direction parallel to a lower edge of the flat filter elements
- wherein said gas outlets are arranged in horizontally oriented contiguous surface regions and are equally spaced from each other laterally such that the lateral distance of adjacent said gas outlets is from 0.2 to 50 mm
- wherein the gas injectors with gas outlets of a gas lifting system are arranged beneath said filter module for giving off a gas, gas injectors with gas outlets arranged in two equally large areas B·G having a length B and a width G, wherein B extends parallel to and essentially over the full length of the flat filter elements and wherein said two equally large areas B·G are separated by a space, such that vertical projections of the gas outlets pass through 10 to 80% of a horizontal cross sectional area A·F of said module, and
- said filter module having at least one rising area in which the crossflow stream flows substantially vertically upward, and at least one falling area in which the crossflow stream flows essentially vertically downward, and said gas outlets are arranged such that the rising area passes through 30 to 60% of a flow volume of said module and the falling area passes through 40 to 70% of a flow volume of said module whereby said crossflows are substantially restricted within said module.
A device for micro-, ultra- or nanofiltration comprising one or more
- immersed flat filter modules, said modules comprising (i) flat filter elements arranged in parallel and at a distance from one another, (ii) one or more gas lifting systems comprising gas injectors having more than one gas outlets for generating a continuous circulating crossflow stream directed tangentially to the surface of the flat filter elements and (iii) at least one outlet line connected to the flat filter element for conveying away permeate,
- said module comprising a frame that is open on one or more sides,
- wherein said module having a horizontal cross sectional area A·F of length A and width F, and
- wherein the gas injectors are tubular hollow bodies, each gas injector having a longitudinal axis substantially in a horizontal plane that is oriented in a direction parallel to a lower edge of the flat filter elements
- wherein said gas outlets are arranged in horizontally oriented contiguous surface regions and are equally spaced from each other laterally such that the lateral distance of adjacent said gas outlets is from 0.2 to 50 mm
- wherein the gas injectors with gas outlets of a gas lifting system are arranged beneath said filter module for giving off a gas, gas injectors with gas outlets arranged in two equally large areas B·G having a length B and a width G, wherein B extends parallel to and essentially over the full length of the flat filter elements and wherein said two equally large areas B·G are separated by a space, such that vertical projections of the gas outlets pass through 10 to 80% of a horizontal cross sectional area A·F of said module, and
- said filter module having at least one rising area in which the crossflow stream flows substantially vertically upward, and at least one falling area in which the crossflow stream flows essentially vertically downward, and said gas outlets are arranged such that the rising area passes through 30 to 60% of a flow volume of said module and the falling area passes through 40 to 70% of a flow volume of said module whereby said crossflows are substantially restricted within said module.
Dependencies are inferred from the claim text.