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: 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: 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 operating while submerged, with a frame (1), which can be lowered into the liquid to be purified, and with modules (2) adjacently arranged in a row. The modules (2) each have a base element (3) with a permeate collecting chamber (4), tubes (5) for a fluid that are connected to both ends of the base element (3), and with hollow fiber membranes (6) that, with an open end, are embedded in the base element (3). The hollow fiber membranes (6) are closed at their other end and terminate inside the liquid to be purified without being fixed whereby being able to freely move. The tubes (5) are vertically oriented and, at the top, are connected to a collecting line. Fiber holding devices (7) for laterally guiding the hollow fiber membrane (6) are fastened to the tubes (5).

Abstract: The invention relates to a membrane filter for operating while submerged, with a frame (1), which can be lowered into the liquid to be purified, and with modules (2) adjacently arranged in a row. The modules (2) each have a base element (3) with a permeate collecting chamber (4), tubes (5) for a fluid that are connected to both ends of the base element (3), and with hollow fiber membranes (6) that, with an open end, are embedded in the base element (3). The hollow fiber membranes (6) are closed at their other end and terminate inside the liquid to be purified without being fixed whereby being able to freely move. The tubes (5) are vertically oriented and, at the top, are connected to a collecting line. Fiber holding devices (7) for laterally guiding the hollow fiber membrane (6) are fastened to the tubes (5).

Abstract: The invention relates to a membrane module for an immersed operation with a fibre bundle (1) of a large number of hollow fibre membranes (2) which with an open end are cast into a headpiece (3) and in immersed operation are surrounded by a liquid to be filtered, having a permeate collection chamber (4) connected to the headpiece with at least one permeate outlet (5) for the permeate draining from the interior of the hollow fibre membranes and a gas supply (6) having a pipe (7) guided by the headpiece. The pipe (7) terminates in the interior of the fibre bundle (1) and has a gas outlet (8) for a gaseous medium which after the transfer from the pipe (7) to the liquid to be filtered largely rises between the hollow fibre membranes (2) of the bundle as bubbles. According to the invention the fibre bundle (1) is divided into sections (11) each comprising a group of hollow fibre membranes (2).

Abstract: The invention relates to a method for aerating a number of membrane modules of a membrane filtering installation operating in a submerged area. Air or a gas is supplied from a common source to the membrane modules and rises in the form of bubbles in the liquid to be purified. On-off valves are placed in the supply lines leading to the membrane modules whereby enabling or preventing the supply of air to an assigned membrane module. In a first method step, when all other membrane modules are closed, the on-off valve assigned to a first membrane module is additionally opened. At the beginning of a second method step, the on-off valve assigned to a second membrane module is opened whereby causing the formation of two partial air flows. At the beginning of a third method step, all membrane modules are aerated in succession until the aeration cycle in the first membrane module starts again.

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.