Filtration apparatus

Abstract

A filtration apparatus for performing solid-liquid separation by immersing a plurality of hollow fiber membranes in a to-be-treated liquid containing a suspended component so that the treated liquid permeates the hollow fiber membranes. The filtration apparatus includes the hollow fiber membranes folded double; a treated liquid collection means communicated with an open-side end of each of the hollow fiber membranes; a holding member for holding a bent portion at an other-end side of each of the hollow fiber membranes with a gap formed between the bent portion of each of the hollow fiber membranes and the holding member; and a gas-jetting means for jetting a cleaning gas from the other-end side of each of the hollow fiber membranes to the open-side end of each of the hollow fiber membranes. A gap for flowing the gas jetted by the gas-jetting means is formed between the hollow fiber membranes held by the holding member and the holding member or/and on at least one part of gaps between the hollow fiber membranes.

1 . A sucking filtration apparatus of an immersion type or a filtration apparatus of an external pressure type for performing solid-liquid separation by immersing a plurality of hollow fiber membranes in a to-be-treated liquid containing a suspended component so that a treated liquid permeates said hollow fiber membranes, comprising:
 said hollow fiber membranes folded double;   a treated liquid collection means communicated with an open end, of each of said hollow fiber membranes, which is disposed opposite to a bent side of each of said hollow fiber membranes;   a holding member for holding a bent portion of each of said hollow fiber membranes with a gap formed between said bent portion of each of said hollow fiber membranes and said holding member; and   a gas jetting means for jetting a cleaning gas from said bent side of each of said hollow fiber membranes to a side of said open end of each of said hollow fiber membranes,   wherein a gap for flowing said gas jetted by said gas jetting means is formed between said hollow fiber membranes held by said holding member and said holding member or/and in at least one part of gaps between said hollow fiber membranes, and   wherein a plurality of said double folded hollow fiber membranes is arranged side by side like a reed screen; and said holding member consisting of a round rod or a flat plate-shaped rod is inserted between both side portions of each of said hollow fiber membranes confronting each other with said bent portion thereof disposed therebetween to hold said bent portion.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . The filtration apparatus according to  claim 1 , wherein said hollow fiber membranes arranged side by side in said axial direction of said rod are spaced at any reasonably small distance or at predetermined intervals; and a block of a plurality of said hollow fiber membranes is spaced at an interval of 2.0 to 10.0 mm from an adjacent block of a plurality of said hollow fiber membranes. 
     
     
         6 . (canceled) 
     
     
         7 . The filtration apparatus according to  claim 1 , wherein a plurality of said rods is disposed in parallel to a direction orthogonal to said axial direction of said rods; and the position in vertical axial direction is varied from each other. 
     
     
         8 . The filtration apparatus according to  claim 1 , wherein said rod is provided with a gas duct which vertically penetrates therethrough. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . (canceled) 
     
     
         12 . A sucking filtration apparatus of an immersion type or a filtration apparatus of an external pressure type for performing solid-liquid separation by immersing a plurality of hollow fiber membranes in a to-be-treated liquid containing a suspended component so that a treated liquid permeates said hollow fiber membranes, comprising:
 said hollow fiber membranes folded double;   a treated liquid collection means communicated with an open end, of each of said hollow fiber membranes, which is disposed opposite to a bent side of each of said hollow fiber membranes;   a holding member for holding a bent portion of each of said hollow fiber membranes with a gap formed between said bent portion of each of said hollow fiber membranes and said holding member; and   a gas jetting means for jetting a cleaning gas from said bent side of each of said hollow fiber membranes to a side of said open end of each of said hollow fiber membranes,   wherein a gap for flowing said gas jetted by said gas jetting means is formed between said hollow fiber membranes held by said holding member and said holding member or/and in at least one part of gaps between said hollow fiber membranes,   wherein as a gas jetting means for jetting a gas for cleaning use, one pressurized gas supply pipe is disposed below said holding member; and one or a plurality of gas jetting holes are formed in said pressurized gas supply pipe.   
     
     
         13 . A sucking filtration apparatus of an immersion type or a filtration apparatus of an external pressure type for performing solid-liquid separation by immersing a plurality of hollow fiber membranes in a to-be-treated liquid containing a suspended component so that a treated liquid permeates said hollow fiber membranes, comprising:
 said hollow fiber membranes folded double;   a treated liquid collection means communicated with an open end, of each of said hollow fiber membranes, which is disposed opposite to a bent side of each of said hollow fiber membranes;   a holding member for holding a bent portion of each of said hollow fiber membranes with a gap formed between said bent portion of each of said hollow fiber membranes and said holding member; and   a gas jetting means for jetting a cleaning gas from said bent side of each of said hollow fiber membranes to a side of said open end of each of said hollow fiber membranes,   wherein a gap for flowing said gas jetted by said gas jetting means is formed between said hollow fiber membranes held by said holding member and said holding member or/and in at least one part of gaps between said hollow fiber membranes,   wherein the filtration apparatus comprises a hollow fiber membrane module having a plurality of hollow fiber membranes arranged side by side,   wherein one open end of each of a plurality of said hollow fiber membranes of said hollow fiber membrane module is fixed to a fixing member by adhesion; said treated liquid collection means consisting of a water-collecting header is mounted on said fixing member; said water-collecting header is connected to a water-collecting pipe; and a liquid which has undergone filtration treatment is sucked to said water-collecting pipe, and   other side of each of a plurality of said hollow fiber membranes of said hollow fiber membrane module is held by said holding member.   
     
     
         14 . The filtration apparatus according to  claim 13 , wherein a skirting part is projected toward said air jetting means along a periphery of said holding member to prevent said jetted gas from escaping from a region surround with said skirting part. 
     
     
         15 . The filtration apparatus according to  claim 14 , further comprising an air-distributing plate having one or a plurality of air-diffusing holes formed therethrough with said air-distributing plate partitioning an inside of said skirting part. 
     
     
         16 . The filtration apparatus according to  claim 13 , wherein said hollow fiber membrane consists of fluororesin containing a porous material made of PTFE. 
     
     
         17 . The filtration apparatus according to  claim 1 , wherein said hollow fiber membrane consists of fluororesin containing a porous material made of PTFE. 
     
     
         18 . The filtration apparatus according to  claim 12 , wherein said hollow fiber membrane consists of fluororesin containing a porous material made of PTFE.