Membrane filter for water treatment

Abstract

The invention relates to a membrane filter for water treatment, comprising a head piece ( 1 ) consisting of a permeate collecting chamber ( 2 ) with a permeate outlet ( 3 ), and at least one fiber bundle ( 4 ) made from capillary membranes, which are poured into the head piece ( 1 ) with an end that is open towards the permeate collecting chamber ( 2 ) and sealed on the opposite end thereof. The head piece ( 1 ) contains an air duct ( 16 ) to which the mouth piece ( 10 ) that protrudes into the fiber bundle ( 4 ) is connected with at least one air outlet ( 11 ). At its other end, the fiber bundle ( 4 ) terminates in freely movable manner in the untreated water ( 6 ).

1 . Membrane filter for water treatment, comprising 
 a head piece ( 1 ) consisting of a permeate collecting chamber ( 2 ) with a permeate outlet ( 3 ),    at least one fiber bundle ( 4 ) made from capillary membranes, which are poured into the head piece ( 1 ) with an end that is open towards the permeate collecting chamber ( 2 ) and sealed on the opposite end thereof, and    a gasification device ( 8 ) with a mouth piece ( 10 ) that has at least one outlet ( 11 ) for air and extends essentially parallel to the capillary membranes ( 5 ), within the fiber bundle ( 4 ),    whereby the capillary membranes ( 5 ) of the fiber bundle ( 4 ) that are surrounded by the untreated water ( 6 ) to be treated are attached, in a dense packing, to a connecting surface ( 7 ) of the head piece ( 1 ), and clarified liquid can be withdrawn in the capillary membranes ( 5 ), to the permeate collecting chamber ( 2 ), characterized in that the head piece ( 1 ) contains an air duct ( 16 ) to which the mouth piece ( 10 ) that protrudes into the fiber bundle ( 4 ) is connected, and that the fiber bundle ( 4 ) terminates, at its other end, without being clamped in place, in freely movable manner in the untreated water ( 6 ).    
     
     
         2 . Membrane filter according to  claim 1 , characterized in that for immersion operation, the connecting surface ( 7 ) is not penetrated by flow channels for the untreated water.  
     
     
         3 . Membrane filter according to  claim 1  or  2 , characterized in that a basket ( 12 ) is set onto the head piece ( 1 ), which limits the lateral movements of the fiber bundle ( 14 ) [sic].  
     
     
         4 . Membrane filter according to  claim 2  or  3 , characterized in that the head piece ( 1 ) has connecting devices for attachment to a frame, which can be lowered into a basin that contains the untreated water.  
     
     
         5 . Membrane filter according to  claim 1 , characterized in that the head piece ( 1 ) has bores ( 15 ) that allow the untreated water to flow through, which are arranged concentrically around the gasification device ( 8 ), and that the capillary membranes ( 5 ) are poured into the head piece ( 1 ) on a ring-shaped connecting surface ( 7 ) between the gasification device ( 8 ) and the bores ( 15 ) that carry the liquid.  
     
     
         6 . Membrane filter according to  claim 5 , characterized in that the connecting surface ( 7 ) of the head piece ( 1 ), into which the capillary membranes ( 5 ) that form the fiber bundle ( 4 ) are poured at their one end, is structured to be star-shaped, whereby the connecting surface ( 7 ) fills up the ring-shaped area between the gasification device ( 8 ) and the concentrically arranged bores ( 15 ), and extends into the regions between the channels for liquid.  
     
     
         7 . Membrane filter according to  claim 5  or  6 , characterized in that the head piece ( 1 ) is releasably connected with a pipe-shaped mantle ( 17 ), which forms the filter chamber ( 14 ) through which flow can take place in the lengthwise direction of the capillary membranes ( 5 ).  
     
     
         8 . Membrane filter according to  claim 7 , characterized in that the head piece ( 1 ) can be connected with the pipe-shaped mantle ( 17 ) of another, identically structured membrane filter, at the face that faces away from the fiber bundle ( 4 ), and that the permeate outlet ( 3 ) is arranged on the circumference of the head piece ( 1 ).  
     
     
         9 . Membrane filter according to one of  claims 5  to  8 , characterized in that several fiber bundles ( 4 ) are connected with the head piece ( 1 ), whereby a gasification device ( 8 ) as well as bores ( 15 ) through which liquid flows, which concentrically surround the gasification device ( 8 ), are assigned to each fiber bundle ( 4 ), and that the head piece ( 1 ) has separate distributor chambers ( 18 ,  19 ) for water and air, into which the bores ( 15 ) for water or the air ducts ( 16 ), respectively, empty; and that chambers that each contain a fiber bundle ( 4 ) of capillary membranes and through which the untreated water flows in the lengthwise direction of the capillary membranes ( 5 ) are releasably connected with the head piece ( 1 ).  
     
     
         10 . Membrane filter according to one of  claims 1  to  9 , characterized in that the mouth piece ( 10 ) has a pipe-shaped section with bores ( 11 ) on the circumference.  
     
     
         11 . Membrane filter according to one of  claims 1  to  9 , characterized in that the mouth piece ( 10 ) is structured as a ring gap nozzle, from which the air exits radially.  
     
     
         12 . Membrane filter according to one of  claims 1  to  11 , characterized in that the mouth piece ( 10 ) has a kick-back valve that closes if the pressure of the air feed drops.