Water treatment apparatus

Abstract

It is an object of the present teachings to provide a technique for effectively providing a packed region in a water treatment apparatus in which the packed region is provided in a path of water to be treated and is filled with biomembrane-deposited members. According to the present invention, a representative water treatment apparatus may include a packed region provided in a path of water to be treated, a first packed part arranged in the packed region, a block of first biomembrane-deposited members that are packed in the first packed part, a second packed part that is arranged under the first packed part, and a plurality of second biomembrane-deposited members that are packed in the second packed part. According to the invention, the first biomembrane-deposited members are configured to prevent the second biomembrane-deposited members from moving into the first packed part by pressing the second biomembrane-deposited members from above. Therefore, the packed region can be formed in simpler structure without adopting any specific devices exclusively designed to keep the second biomembrane-deposited members within the second packed part.

1 . A water treatment apparatus, comprising: 
 a packed region provided in a path of water to be treated,    a first packed part arranged in the packed region,    a block of first biomembrane-deposited members that are packed in the first packed part,    a second packed part that is arranged under the first packed part, and    a plurality of second biomembrane-deposited members that are packed in the second packed part,    wherein the first biomembrane-deposited members press on the second biomembrane-deposited members from above, thereby preventing the second biomembrane-deposited members from moving into the first packed part.    
   
   
       2 . The water treatment apparatus as defined in  claim 1 , wherein the first biomembrane deposited members directly press on the second biomembrane-deposited members from above.  
   
   
       3 . The water treatment apparatus as defined in  claim 1 , wherein the first biomembrane-deposited members comprise a plurality of plate members, the plate members extending vertically and parallel to each other and being connected to each other into one block in the first packed part.  
   
   
       4 . The water treatment apparatus as defined in  claim 1 , wherein the first biomembrane-deposited members comprise a plurality of plate members, the plate members extending vertically and equidistantly parallel to each other and being connected to each other into one block in the first packed part.  
   
   
       5 . The water treatment apparatus as defined in  claim 1 , wherein the first biomembrane-deposited members comprise a plurality of corrugated plate members, the corrugated plate members extending vertically and parallel to each other and being connected to each other into one block in the first packed part.  
   
   
       6 . The water treatment apparatus as defined in  claim 1 , further comprising an engaging member that are secured to the first packed part, wherein the first biomembrane-deposited members comprise a plurality of plate members, the plate members extending vertically and parallel to each other and being connected to each other into one block in the first packed part and wherein the engaging member locks and positions the first biomembrane-deposited members in the first packed part.  
   
   
       7 . The water treatment apparatus as defined in  claim 1 , wherein the second biomembrane-deposited members are packed in the second packed part  
   
   
       8 . The water treatment apparatus as defined in  claim 1 , wherein each of the second biomembrane-deposited members has a cylindrical shape with a circular section.  
   
   
       9 . The water treatment apparatus as defined in  claim 1 , wherein the second biomembrane-deposited members have a wall surface having a luffa-like cylindrical form.  
   
   
       10 . The water treatment apparatus as defined in  claim 1 , wherein a base net is further provided in the bottom of the second packed part and prevents the plurality of the second biomembrane-deposited members from moving downward out of the second packed part.  
   
   
       11 . The water treatment apparatus as defined in  claim 1 , wherein the first biomembrane-deposited members comprise a plurality of plate members, the plate members extending vertically and equidistantly parallel to each other and being connected to each other into one block in the first packed part, and wherein the spacing between the plate members is substantially shorter than the outer diameter of the second biomembrane-deposited members packed in the second packed part.  
   
   
       12 . The water treatment apparatus as defined in  claim 1 , wherein the first biomembrane-deposited members comprise a plurality of plate members, the plate members being connected to each other into one block and thereafter packed in the first packed part.  
   
   
       13 . The water treatment apparatus as defined in  claim 1 , wherein the first packed part packed with the first biomembrane-deposited members has a larger percentage of void than the second packed part packed with the second biomembrane-deposited members.  
   
   
       14 . The water treatment apparatus as defined in  claim 1 , further comprising an air diffuser that is disposed below the second packed part and supplies air into the first and second packed parts.  
   
   
       15 . The water treatment apparatus as defined in  claim 1 , further comprising an air diffuser that is disposed below the second packed part and supplies air into the first and second packed parts, wherein the air diffuser provides formation of biomembrane of aerobic microbes on the first and second biomembrane-deposited members.  
   
   
       16 . The water treatment apparatus as defined in  claim 1 , further comprising a third packed part that is disposed within the packed region on the upstream side of the first packed part.  
   
   
       17 . The water treatment apparatus as defined in  claim 1 , further comprising a third packed part that is disposed within the packed region on the upstream side of the first packed part, a plurality of granular carriers packed in the third packed part, and a box-like member that houses the granular carriers while preventing the granular carriers from moving out of the box-like member.  
   
   
       18 . The water treatment apparatus as defined in  claim 1 , further comprising an anaerobic filter bed tank that is disposed on the upstream side of the packed region.  
   
   
       19 . The water treatment apparatus as defined in  claim 1 , wherein the water treatment apparatus is designed as a septic tank having a foreign matter removing tank, an anaerobic filter bed tank, said packed region, a treated water tank and a sterilizing chamber which are arranged in series in this order from the upstream side.  
   
   
       20 . The water treatment apparatus as defined in  claim 1 , wherein the packed region is designed as an aerobic filter bed tank that aerobically treats the water to be treated, and wherein the water treatment apparatus is designed as a septic tank having a foreign matter removing tank, an anaerobic filter bed tank, said packed region, a treated water tank and a sterilizing chamber which are arranged in series in this order from the upstream side, and a housing that houses the foreign matter removing tank, the anaerobic filter bed tank, the packed region, the treated water tank and the sterilizing chamber as an integral body.  
   
   
       21 . A septic tank, comprising: 
 a foreign matter removing tank provided in a path of water to be treated,    an anaerobic filter bed tank disposed downstream of the foreign matter removing tank,    an aerobic filter bed tank disposed downstream of the anaerobic filter bed tank,    a treated water tank disposed downstream of the aerobic filter bed tank,    a sterilizing chamber disposed downstream of the treated water tank,    a first packed part arranged in the aerobic filter bed tank,    biomembrane-deposited members that are packed in the first packed part,    a second packed part placed under the first packed part,    a plurality of granular carriers that are packed in the second packed part in random arrangements and pressed on from above by the biomembrane-deposited members, and    a housing that houses the foreign matter removing tank, the anaerobic filter bed tank, the packed region, the treated water tank and the sterilizing chamber and defines a contour of the septic tank.