Abstract: A membrane filter for submerged operation for filtering a liquid, comprising membrane elements and geyser elements for flushing the membrane elements in pulses using a gas, each membrane element having: hollow fiber membranes secured in a base element, each hollow fiber membrane having a lumen into which a liquid permeate is filterable out of the liquid, a permeate collection cavity connected to the lumens of the hollow fiber membranes for collecting the permeate from the hollow fiber membranes, a permeate outlet for discharging the permeate out of the permeate collection chamber, and a tubular housing enveloping the hollow fiber membranes of the membrane elements and penetrated by the permeate outlet, wherein the geyser elements are installed below the membrane elements, and each of the geyser elements having: a gas collection cavity and an outlet device for discharging the gas in pulses upwards out of the gas collection cavity.

Abstract: A method for introducing a gas into a liquid, the method including filling a gas volume enclosed below a free surface of the liquid and defined in a downward direction by an enclosed level of the liquid with the gas in sequential pulses wherein the gas simultaneously displaces the liquid top down from a gas lifting channel until the enclosed level of the liquid drops below an inlet cross section of a gas flow out channel; subsequently flowing the gas out of the gas volume downward through the gas lifting channel, a deflection portion adjoining at a bottom of the gas lifting channel, in upward direction through the inlet cross section and through the gas flow out channel adjoining the inlet cross section at a top to the free surface.

Abstract: A method the filtering a liquid in a membrane filter immersed in the liquid and including membranes, the method including introducing a gas through a gas introduction device into a base of the membrane filter in successive pulses so that the membranes are cleaned wherein the gas introduction device includes a liquid flow channel which vertically penetrates a gas collection cavity and admits the liquid into a bottom of membrane filter; and initially filling a gas volume arranged below a free surface of the liquid and defined in a downward direction by an enclosed level of the liquid with the gas wherein the gas simultaneously displaces the liquid top down from a gas lifting channel until the enclosed level of the liquid drops below an inlet cross section of a gas flow out channel; and subsequently.

Abstract: A membrane filter configured to filter a liquid, the membrane filter including a base element including at least one membrane carrier that is externally flowable by the liquid and a gas; hollow fiber membranes respectively including lumen and attached at a top of the at least one membrane carrier wherein a liquid permeate is filterable from the liquid into the lumen; a one piece extruded circumferentially closed pipe that envelops the hollow fiber membranes; a gas inlet configured to let gas into a bottom of the membrane filter; at least one permeate collection cavity included in the base element and connected with the lumen and configured to collect the liquid permeate from the hollow fiber membranes; a permeate outlet included in the base element and configured to drain the liquid permeate from the at least one permeate collection cavity laterally from the base element.

Abstract: A membrane filter for filtering a liquid to be filtered, having a downwardly open base element through which flow can pass and which has a tubular shell and precisely one membrane carrier arranged therein, wherein the membrane carrier is connected to the shell by way of at least one anchoring point, having hollow fiber-type membranes fastened at the top in the membrane carrier, having a circumferentially closed pipe which, adjoining the top of the shell of the base element, surrounds the hollow fiber-type membranes, having a gas inlet into the base element, having at least one permeate collecting chamber, having at least one permeate outlet, and having at least one downwardly open flow chamber between the shell and the membrane carrier, which flow chamber has an outlet at the top, wherein the at least one flow chamber, in every horizontal section, adjoins both the shell and the membrane carrier.

Abstract: A method for producing a membrane filter for filtering a liquid, wherein the membrane filter includes at least one header and at least one membrane block that is connected with the at least one header, wherein the at least one membrane block includes multiple rows of hollow fiber membranes arranged substantially parallel to one another, wherein each of the hollow fiber membranes includes an open end that connects to a permeate chamber in the at least one header and a filtrate is pullable from the permeate chamber during operation of the membrane filter, wherein the at least one membrane block includes a spacer at a distance from the open end, wherein the spacer connects the hollow fiber membranes with one another and keeps them apart, and wherein the hollow fiber membranes are enveloped by a seal layer between the spacer and the open end.

Abstract: A membrane filter for filtering a liquid to be filtered, the membrane filter including at least one membrane carrier to which membranes are fixed, the membranes allowing a liquid permeate to be filtered out of the liquid, and the membrane carrier includes a permeate collecting chamber to which the membranes are connected in an open manner on the permeate side, and also comprises a permeate outlet for the discharge of the permeate out of the permeate collecting chamber; a gas distribution system which is arranged below the at least one membrane carrier and which has at least one downwardly open and upwardly closed tub which has a wall with downwardly open vertical slots for the distribution of a gas into the liquid to be filtered, at least one gas inlet leading into the gas distribution system. The invention also relates to a method for filtering a liquid.

Abstract: A method for producing a membrane filter for filtering a liquid, wherein the membrane filter includes at least one header and at least one membrane block that is connected with the at least one header, wherein the at least one membrane block includes multiple rows of hollow fiber membranes arranged substantially parallel to one another, wherein each of the hollow fiber membranes includes an open end that connects to a permeate chamber in the at least one header and a filtrate is pullable from the permeate chamber during operation of the membrane filter, wherein the at least one membrane block includes a spacer at a distance from the open end, wherein the spacer connects the hollow fiber membranes with one another and keeps them apart, and wherein the hollow fiber membranes are enveloped by a seal layer between the spacer and the open end.

Abstract: A membrane filter for filtering a liquid to be filtered, having a downwardly open base element through which flow can pass and which has a tubular shell and precisely one membrane carrier arranged therein, wherein the membrane carrier is connected to the shell by way of at least one anchoring point, having hollow fiber-type membranes fastened at the top in the membrane carrier, having a circumferentially closed pipe which, adjoining the top of the shell of the base element, surrounds the hollow fiber-type membranes, having a gas inlet into the base element, having at least one permeate collecting chamber, having at least one permeate outlet, and having at least one downwardly open flow chamber between the shell and the membrane carrier, which flow chamber has an outlet at the top, wherein the at least one flow chamber, in every horizontal section, adjoins both the shell and the membrane carrier.

Abstract: A membrane filter for filtering a liquid to be filtered, the membrane filter including at least one membrane carrier to which membranes are fixed, the membranes allowing a liquid permeate to be filtered out of the liquid, and the membrane carrier includes a permeate collecting chamber to which the membranes are connected in an open manner on the permeate side, and also comprises a permeate outlet for the discharge of the permeate out of the permeate collecting chamber; a gas distribution system which is arranged below the at least one membrane carrier and which has at least one downwardly open and upwardly closed tub which has a wall with downwardly open vertical slots for the distribution of a gas into the liquid to be filtered, at least one gas inlet leading into the gas distribution system. The invention also relates to a method for filtering a liquid.

Abstract: A membrane module for an immersed operation has a fiber bundle of hollow fiber membranes which are cast into a headpiece and in immersed operation are surrounded by a liquid to be filtered. The module has a permeate collection chamber connected to the headpiece with an outlet for permeate draining from the interior of the hollow fiber membranes, and a gas supply having a pipe guided by the headpiece. The pipe terminates in the interior of the fiber bundle and has a gas outlet for a gaseous medium, which after the transfer from the pipe to the liquid to be filtered rises as bubbles between the hollow fiber membranes. The fiber bundle is divided into sections and free spaces remain between the sections which extend from the pipe to the outer circumference of the headpiece and promote an inflow of the liquid into a foot area adjoining the headpiece.

Abstract: A device for gassing a liquid, particularly for membrane facilities used in immersion operation, has a gas supply channel and at least one gas lance from which a gas flow exits in gassing operation. The gas lance is connected to the gas supply channel via at least one connection channel including a first mouth area on the side of the gas lance and a second mouth area on the side of the gas supply channel and generating as a throttle a flow pressure loss of the gas flow entering the gas lance. Below the first mouth area an extension section is provided, which adjoins the gas lance and has an opening below the first mouth area.

Abstract: The invention relates to a membrane filter for water treatment, comprising a head piece including a permeate collecting chamber with a permeate outlet, and at least one fiber bundle made from capillary membranes, which are secured into the head piece with an end that is open towards the permeate collecting chamber and sealed on the opposite end thereof. The head piece contains an air duct to which the mouth piece that protrudes into the fiber bundle is connected with at least one air outlet. At its other end, the fiber bundle terminates in freely movable manner in the untreated water.

Abstract: The invention relates to a membrane filter unit for liquid or gaseous media, comprising a bundle of capillary membranes which are open on at least one front surface side and which are cast in an area which is close to the end of the open membrane ends, in a sealing layer forming a hardened head part. The open membrane ends protrude on the outer side of the sealing layer. The sealing layer is arranged on a spacer element which has a layer which is penetrated by the capillary membranes and which is non-permeable in relation to the casting material which hardens in order to form the sealing layer. The invention also relates to a method for the production of a membrane filter unit.

Abstract: The invention relates to a membrane filter for water treatment, comprising a head piece including a permeate collecting chamber with a permeate outlet, and at least one fiber bundle made from capillary membranes, which are secured into the head piece with an end that is open towards the permeate collecting chamber and sealed on the opposite end thereof. The head piece contains an air duct to which the mouth piece that protrudes into the fiber bundle is connected with at least one air outlet. At its other end, the fiber bundle terminates in freely movable manner in the untreated water.

Abstract: The present invention relates to a device for gassing a liquid (1), particularly for membrane facilities used in immersion operation, having a gas supply channel (2) and at least one gas lance (3) from which a gas flow exits in gassing operation. According to the present invention the gas lance (3) is connected to the gas supply channel (2) by means of at least one connection channel (5) comprising a first mouth area (8) on the side of the gas lance (3) and a second mouth area (8?) on the side of the gas supply channel (2) and generating as a throttle a flow pressure loss of the gas flow entering the gas lance (3). Below the first mouth area (8) an extension section (6) is provided, which adjoins the gas lance (3) and has an opening (7) below the first mouth area (8).

Abstract: A membrane module for an immersed operation has a fiber bundle of hollow fiber membranes which are cast into a headpiece and in immersed operation are surrounded by a liquid to be filtered. The module has a permeate collection chamber connected to the headpiece with an outlet for permeate draining from the interior of the hollow fiber membranes, and a gas supply having a pipe guided by the headpiece. The pipe terminates in the interior of the fiber bundle and has a gas outlet for a gaseous medium, which after the transfer from the pipe to the liquid to be filtered rises as bubbles between the hollow fiber membranes. The fiber bundle is divided into sections and free spaces remain between the sections which extend from the pipe to the outer circumference of the headpiece and promote an inflow of the liquid into a foot area adjoining the headpiece.

Abstract: A membrane module for an immersed operation has a fibre bundle of hollow fibre membranes which are cast into a headpiece and in immersed operation are surrounded by a liquid to be filtered. The module has a permeate collection chamber connected to the headpiece with an outlet for permeate draining from the interior of the hollow fibre membranes, and a gas supply having a pipe guided by the headpiece. The pipe terminates in the interior of the fibre bundle and has a gas outlet for a gaseous medium, which after the transfer from the pipe to the liquid to be filtered rises as bubbles between the hollow fibre membranes. The fibre bundle is divided into sections and free spaces remain between the sections which extend from the pipe to the outer circumference of the headpiece and promote an inflow of the liquid into a foot area adjoining the headpiece.

Abstract: The invention relates to a membrane filter unit for liquid or gaseous media, comprising a bundle of capillary membranes which are open on at least one front surface side and which are cast in an area which is close to the end of the open membrane ends, in a sealing layer forming a hardened head part. The open membrane ends protrude on the outer side of the sealing layer. The sealing layer is arranged on a spacer element which has a layer which is penetrated by the capillary membranes and which is non-permeable in relation to the casting material which hardens in order to form the sealing layer. The invention also relates to a method for the production of a membrane filter unit.

Abstract: The invention relates to a membrane filter for water treatment, comprising a head piece including a permeate collecting chamber with a permeate outlet, and at least one fiber bundle made from capillary membranes, which are secured into the head piece with an end that is open towards the permeate collecting chamber and sealed on the opposite end thereof. The head piece contains an air duct to which the mouth piece that protrudes into the fiber bundle is connected with at least one air outlet. At its other end, the fiber bundle terminates in freely movable manner in the untreated water.