Membrane filter and filtering method

Abstract

The invention discloses a membrane filter for filtering a liquid to be filtered, having a downwardly open base element (2) through which flow can pass and which has a tubular shell (3) and precisely one membrane carrier (4) situated therein, wherein the membrane carrier (4) is connected to the shell (3) by way of at least one anchoring point (15), having hollow fiber-type membranes (5) fastened at the top in the membrane carrier (4), having a circumferentially closed pipe (6) which, adjoining the top of the shell (3) of the base element (2), surrounds the hollow fiber-type membranes (5), having a gas inlet (13) into the base element (2), having at least one permeate collecting chamber (25), having at least one permeate outlet (14), and having at least one downwardly open flow chamber (16) between the shell (3) and the membrane carrier (4), which flow chamber has an outlet (17) at the top, wherein the at least one flow chamber (16), in every horizontal section, adjoins both the shell (3) and the membrane carrier (4), and the membrane carrier (4) fully closes off the base element (2) with the exception of the at least one flow chamber (16) for the throughflow, from bottom to top, of the liquid to be filtered. The invention also discloses a method for filtering a liquid in a membrane filter of said type. To reduce the tendency for blockage, it is proposed that the base element (2) consequently be designed such that flow can pass through it from the gas inlet (13) to the outlet (17) of the at least one flow chamber (16). In the method for filtering a liquid to be filtered in a membrane filter of said type, the gas flows through the base element (2) from the gas inlet (13) into the at least one flow chamber (16) and, together with the liquid to be filtered, through said flow chamber and through the outlet (17) into the pipe (6).

Description

technical field [0001] The invention relates to a membrane filter for filtering liquids to be filtered, with a bottom part open downwards through which gases and liquids can flow, said bottom part having a tubular housing and exactly one Membrane support in the housing, wherein the membrane support is connected to the housing via at least one anchor point; with hollow fiber membranes respectively equipped with cavities fastened in the membrane support above, the filtrate can be extracted from the liquid to be filtered Filtration into said cavity; with circumferentially closed tubes connected above the housing and surrounding the hollow fiber membranes; with gas inlet for gas into the bottom part; with gas for gas into the bottom with at least one filtrate collection chamber connected to the cavity of the hollow fiber membrane for collecting filtrate from the hollow fiber membrane; with at least one for the filtrate to flow from at least one The filtrate outlet discharged from...

AI Technical Summary

Problems solved by technology

In addition to this fluid chamber, the membrane filter also has other through-holes for the liquid and gas to be filtered to enter the interior, but the through-holes do not adjoin both the membrane support and the tube.

The problem is precisely these small through-holes that flow through in parallel, because they are very easy to plug

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