JP2010274199A5 - - Google Patents

Claims (8)

In a coagulation sedimentation apparatus comprising a settling tank that receives raw water mixed with a flocculant, a floc discharge section that discharges floc precipitated in the settling tank, and a treated water discharge section that discharges treated water from the settling tank ,
A cylindrical inner wall portion that is provided in the settling tank, divides an inner region and an outer region, and an upper end is opened,
A drive shaft tube that extends along the axis of the inner wall portion, rotates about the axis, and flows the raw water;
A dispersion tube that protrudes from the drive shaft tube in a direction intersecting the axis, communicates with the inside of the drive shaft tube, and rotates in conjunction with the drive shaft tube;
A discharge port of raw water provided in the dispersion pipe,
One of the inner region and the outer region defined by the inner wall portion is a flock growth zone in which a fluid bed of flock is formed by the upward flow of the raw water, and the other is generated in the flock growth zone. Is a floc sedimentation zone where the floc settles,
The coagulation sedimentation apparatus, wherein the discharge port of the dispersion pipe is disposed in the floc growth zone.   The coagulation sedimentation apparatus according to claim 1, wherein the sedimentation tank has a circular or polygonal cross-sectional shape along a plane orthogonal to the axis.   The coagulation sedimentation apparatus according to claim 1 or 2, wherein the dispersion pipe is arranged at the bottom of the sedimentation tank. The outer region is the floc growth zone and the inner region is the floc settling zone;
The inner wall portion is inserted through the drive shaft tube, and is provided on a cylindrical rotating cylinder fixed to the driving shaft tube, and is erected on the bottom of the sedimentation tank, and is in sliding contact with the rotating tube and rotates. A cylindrical fixed tube that rotatably supports the tube,
2. The coagulation sedimentation apparatus according to claim 1, wherein the dispersion pipe extends through the rotating cylinder and the discharge port is provided outside the rotating cylinder. The rotating cylinder is provided with a plurality of flock sucking portions in which the inner region and the outer region communicate with each other,
The coagulation sedimentation apparatus according to claim 4, wherein the plurality of flock suction portions are evenly arranged in a circumferential direction of the rotating cylinder. A raw water supply line for supplying raw water to the drive shaft tube;
The raw water supply line includes a stirring section of the raw water, a first flocculant introduction section that is disposed upstream of the stirring section and supplies the first flocculant to the raw water, and downstream of the stirring section. The coagulation sedimentation according to any one of claims 1 to 5 provided with the 2nd flocculant introduction part arranged on the side and supplying the 2nd flocculant to said raw water apparatus.   The coagulation sedimentation apparatus according to claim 1, wherein the discharge port provided in the dispersion pipe is disposed at a lower portion inside the inner wall portion.   The inner region defined by the inner wall is the floc growth zone and the outer region is the floc settling zone;
  The inner wall has a bottom, and the floc sent from the floc growth zone to the floc sedimentation zone through the upper portion of the inner wall is settled and separated from raw water in the floc sedimentation zone, and is discharged from the floc discharge section. 8. The coagulation sedimentation apparatus according to claim 7, wherein the coagulation sedimentation apparatus is discharged.