JP3303723B2 - Coagulation treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an agglomeration method for solidifying a suspended solid (also referred to as SS) in raw water into solid and liquid flocculated sludge by flocculation reaction. It relates to a processing device.

[0002]

2. Description of the Related Art In a flocculation treatment tank having a feed path for raw water and a discharge path for treated water, SS is formed into flocs in accordance with the amount of treated water, the residence time, the properties of SS in the raw water, and the like. It is conventionally known to select an optimal stirring blade and to rotate the stirring blade.

[0003]

When SS grows into flocs due to an agglutination reaction in the treatment tank, it sinks to the bottom of the tank at a high sedimentation speed, and the growth of unreacted SS remaining in water is suppressed. Strong stirring must be performed by the stirring blade so that the entire floc inside floats together with the SS. As a result, the SSs are coarsened by the mutual collision to become flocs, while the coarsened flocs collide with the stirring blades and are crushed, so that a contradictory phenomenon occurs, and a uniform and large floc cannot be obtained. In addition, raw water that has flowed into the treatment tank due to strong agitation is short-passed to the outlet path and flows into the sedimentation tank until floc does not grow. From the exit, treated water of poor quality mixed with SS flows out.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems. The present invention provides an agglomeration treatment apparatus comprising an agglomeration treatment tank and a passage through which a liquid and a sediment pass. A plurality of partition plates for dividing the inside of the coagulation treatment tank into a plurality of vertical chambers; a stirring means for stirring the interior of each of the compartments divided by the partition plate; And a treated water supply passage provided at one of the upper and lower ends of the treatment tank, and a treated water take-out passage provided at the other end of the treatment tank. The passages are fan-shaped, and the passage of the partition plate in the upper chamber and the passage of the partition plate in the lower chamber are kept in phase, so that the water flowing through both passages is not short-circuited. I do.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The partition plate is provided with a stirring blade, Specification
The cutting plate may be fixed at the center to the rotation shaft and driven to rotate, or the partition plate may be fixed to the inner wall of the coagulation treatment tank, and the partition plate is gently penetrated through the center to rotate. axis
The stirring blade is rotated on a partition plate may be provided.
Further, a discharge path for sediment may be provided at the lower end of the processing tank.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the illustrated embodiments, reference numeral 10 denotes a coagulation treatment tank, 11 a passage 12 through which a liquid and a sediment (sludge) pass, and the inside of the treatment tank is divided into a plurality of vertical chambers 13. The partition plates 14 show stirring means for stirring the inside of each of the chambers 13 divided by the partition plate. The stirring means hangs down along the center of the coagulation treatment tank, and the rotating shaft 15 is driven to rotate by the motor M. And a stirring blade 16 that rotates horizontally by rotation of a rotating shaft. The stirring blade is a plate-shaped or comb-shaped paddle having a height of 5 to 10 cm.
About 100 cm / sec.

The tank height and diameter of the coagulation tank are appropriately determined according to the concentration of SS contained in the raw water, but the height of the stirring blade is 5 to 10 cm and the chamber 1 is divided by a partition plate.
The height of 3 is preferably about 20 to 50 cm.

The passage 12 provided in the partition plate 11 has an opening angle 30
When the inside of the agglomeration treatment tank is divided into three or more chambers in the vertical direction by two or more partitions in a sector shape of up to 90 °, the passage 12 of the upper partition and the passage 12 of the lower partition are provided. Have a phase of 180 ° (see FIGS. 1B and 4B). In each of the illustrated embodiments, the partition plate 11 is provided in five stages in the vertical direction, and the inside of the coagulation treatment tank is divided into six chambers in the vertical direction.

When raw water is passed in a downward flow, the raw water is supplied to the uppermost chamber 13A through the supply passage 17 for supplying the raw water to the upper chamber 13A in order to extract the treated water by flowing the raw water vertically into the coagulation treatment tank. An extraction path 18 for extracting treated water is provided in the lower chamber 13B.
When the raw water flows in the upward flow, a supply path 17 for supplying the raw water to the lowermost chamber 13B and an extraction path 18 for taking out the treated water to the uppermost chamber 13A are provided as shown by broken lines. A discharge path 19 for sediment (coagulated sludge) is provided at the bottom of the lowermost chamber. Note that a coagulant is added to the raw water supplied to the supply path 17 in advance.

In the embodiment shown in FIG. 1, the center of each partition plate 11 is fixed to the rotating shaft 15 of the stirring means 14, and the partition plate is rotated integrally with the rotating shaft 15 horizontally. Then, the stirring blade 16 is provided by bending the straight edge portion in the radial direction of the fan-shaped passage 13 upward or downward at right angles, or by welding the upper and lower surfaces of the partition plate in the radial direction (see FIG. 1C). . Note that a gap of about 0.5 to 2 cm is formed between the outer periphery of the partition plate 11 and the inner periphery of the processing tank.

In order to perform the treatment, all the partition plates 11 are horizontally rotated integrally with the rotating shaft 15, and when water flows downward in the tank, the raw water containing coagulant is added to the uppermost chamber 13A. Supply. Since all the partition plates 11 rotate integrally,
Passage 12 of upper partition plate and passage 12 of lower partition plate 12
Keeps the phase of 180 °, so that the water flows down from the upper chamber to the lower chamber in order as shown by the arrow without short-circuiting, and the stirring blades 16 which rotate integrally with the partition plate in each chamber are shown. An agglutination reaction is caused by the stirring action, and the SS gradually aggregates and grows into flocs. And since strong stirring is not required by the stirring blade, the floc is not destroyed. In this way, when acting as a flocculation tank, water containing large and uniform flocs is taken out from the take-out channel 18 and supplied to a processing means such as a sedimentation tank at the subsequent stage. Also, the lowermost room 1
In the case where floc containing sedimentation, such as gravel, settles on the bottom of 3B, the floc is discharged from the discharge path 19 periodically or continuously.

Further, all the partition plates 11 are integrally formed with the rotating shaft 15.
Is rotated horizontally, and when water flows in the tank in an upward flow, the raw water to which the coagulant is added is supplied to the lowermost chamber 13B. Since all the partition plates 11 rotate integrally, the passage 12 of the upper partition plate and the passage 12 of the lower partition plate 12 are 180 °.
, The water rises in order from the lower chamber to the upper chamber without short-circuiting, and causes a coagulation reaction due to the stirring action of the stirring blade 16 which turns integrally with the partition plate in each chamber. Gradually aggregates and grows into flocs. And since strong stirring is not required by the stirring blade, the floc is not destroyed. If the flock grows significantly and can descend the path of the partition plate by its own weight against the upward flowing water, the flock moves from the upper chamber to the lower chamber in order, and finally the lowermost Settles at the bottom of the chamber 13B with a uniform size, and generates a sludge zone from the bottom of the reactor up to about half the height of the reactor. When the height of the sludge zone is further increased, excess sludge in the sludge zone is discharged from the discharge passage 19 periodically or continuously. Then, the treated water from which the SS has been removed by the sludge zone is extracted from the extraction passage 18 provided in the uppermost chamber 13A. When the sludge zone is not generated by flocs, it is taken out from the discharge passage 18 as treated water containing large and uniform flocs, and supplied to a processing means such as a sedimentation tank at the subsequent stage.

Depending on the nature of the SS in the raw water, the partition plate 11
It can accumulate on top and disrupt the flow of water, and the weight can deform the divider. In order to prevent this, as shown in FIG. 2, the stirring blade 16 is provided downward on the lower surface of the partition plate 11 and is separated from the upper surface of the partition plate by about 0.5 to 2 cm in the diametrical direction avoiding the rotation axis. The both ends of the scraping member 20 made of a bar and a square are fixed to the inner wall of the processing tank, and the sludge deposited on the rotating partition plate is separated from the passage 12 by the scraping member 20 onto the lower partition plate. Let it fall.
Alternatively, as shown in FIGS. 3A and 3B, the partition plate 11 may have a convex or concave conical shape to prevent sludge from depositing on the upper surface thereof.

FIG. 4 shows the outer periphery of each partition plate 11 in the processing tank 10.
And the rotating shaft 15 of the agitating means 14 hangs loosely through the center hole of the partition plate. A plurality of agitating blades 16 are provided on the rotating shaft 15 in a radial manner so as to rotate horizontally about 0.5 to 2 cm apart from the upper surface of the partition plate.

In order to perform the processing, the stirring blade 1 is rotated by rotating the rotating shaft.
When the water 6 is swirled and water flows downward in the tank, the raw water to which the coagulant has been added is supplied to the uppermost chamber 13A. The path 12 of the upper partition plate and the path 12 of the lower partition plate are 180
°, the water flows down from the upper chamber to the lower chamber in order as shown by the arrow without short-circuiting, and the agitation action of the stirring blades 16 rotating in each chamber causes an agglutination reaction. , SS gradually aggregate and grow into flocs. And since strong stirring by the stirring blade is not required, the flocks are not destroyed. In this way, when acting as a flocculation tank, water containing large and uniform flocs is taken out from the take-out channel 18 and supplied to a processing means such as a sedimentation tank at the subsequent stage. Further, when flocs having a high sedimentation property including gravel settle on the bottom of the lowermost chamber 13B, the flocs are discharged from the discharge path 19 periodically or continuously. Further, the treated water from which SS has been removed is taken out from the take-out passage 18.

When the stirring blade is swirled by the rotation of the rotating shaft and water flows upward in the tank, raw water to which a coagulant has been added is supplied to the lowermost chamber 13B. Passage 12 of upper partition plate
And the passage 12 of the lower partition plate keeps the phase of 180 °, so that the water rises in order from the lower chamber to the upper chamber without short-circuiting, and the stirring action of the stirring blades 16 rotating in each chamber. Causes an aggregation reaction, and the SS gradually aggregates and grows into flocs. And since strong stirring by the stirring blade is not required, the flocks are not destroyed. If the flock grows significantly and can descend the path of the partition plate by its own weight against the upward flowing water, the flock moves from the upper chamber to the lower chamber in order, and finally the lowermost Settles at the bottom of the chamber 13B with a uniform size, and generates a sludge zone from the bottom of the reactor up to about half the height of the reactor. When the height of the sludge zone is further increased, excess sludge in the sludge zone is discharged from the discharge passage 19 periodically or continuously. Then, the treated water from which the SS has been removed by the sludge zone is extracted from the extraction passage 18 provided in the uppermost chamber 13A. When the sludge zone is not generated by the floc, the treated water containing the large and uniform floc is taken out of the discharge path 1.
8 and supplied to processing means such as a sedimentation tank at the subsequent stage.

[0017]

As apparent from the above, according to the present invention,
When raw water flows downward or upward through a plurality of vertical chambers of the coagulation treatment tank separated by a partition plate , the upper chamber
The passage of the cutting plate and the passage of the partition plate of the lower chamber are connected in phase.
Water does not pass through, so water does not short-circuit from the upper chamber to the lower chamber.
Descend sequentially, or ascend from lower chamber to upper chamber
Then , the flocculation reaction is effectively performed by the stirring action of the stirring blades rotating in each room, and the SS in the raw water grows into uniform and large flocs. In the case where a floc that is upward flowing and that makes the sludge zone clear is selected, the floc settles at the bottom of the tank, and the solid water can be sufficiently separated by the raw water passing through the sludge zone. And since a large floc has a high sedimentation speed, the coagulation treatment tank can be miniaturized.
Further, since the solid-liquid separation is sufficiently performed, there are few small flocs which are liable to carry over, and clear treated water can be obtained.

[Brief description of the drawings]

1A is a longitudinal sectional view of a first embodiment of the coagulation processing apparatus of the present invention, FIG. 1B is a sectional view taken along line BB of FIG. 1A,
(C) is a cutaway perspective view of a main part.

FIG. 2A is a longitudinal sectional view of a part of a second embodiment of the coagulation apparatus of the present invention, and FIG. 2B is a sectional view taken along line BB of FIG. 2A.

FIGS. 3A and 3B are cross-sectional views showing two examples of a partition plate that can be used in the embodiment shown in FIGS. 1 and 2;

4 (A) is a longitudinal sectional view of still another embodiment of the coagulation treatment apparatus of the present invention, FIG. 4 (B) is a sectional view taken along line BB of FIG. 4 (A), and FIG. It is a fragmentary perspective view of a part.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Coagulation treatment tank 11 Partition plate 12 Partition plate passage 13 Room divided vertically by partition plate 13A Uppermost chamber 13B Lowermost chamber 14 Stirring means 15 Rotating shaft of stirring means 16 Stirring blades of stirring means 17 Raw water Supply path 18 treated water removal path 19 sediment discharge path 20 scraping member

Claims (3)

(57) [Claims] An agglomeration treatment tank, a plurality of partitions provided with a passage through which a liquid and a sediment pass, and a plurality of partition plates for dividing the inside of the agglutination treatment tank into a plurality of vertical chambers, and the partition plate A stirring means for stirring the inside of each chamber, and a raw water supply passage provided at one of the upper and lower ends of the treatment tank for extracting the treated water by vertically flowing the raw water into the coagulation treatment tank. And a discharge path for treated water provided at the other end.
The passages of the dividers are fan-shaped, and the passages of the dividers in the upper chamber
And the passage of the partition plate in the lower chamber
An agglomeration treatment apparatus characterized in that water flowing in a road is not short-circuited . 2. The coagulation treatment apparatus according to claim 1, wherein the partition plate has stirring blades, and the partition plate has a center at a rotation axis.
An agglomeration processing apparatus, which is fixed and driven to rotate. 3. The coagulation treatment apparatus according to claim 1, wherein the partition plate is fixed to an inner wall of the coagulation treatment tank .
An agglomeration treatment apparatus, wherein a stirring shaft rotatably driven on a partition plate is provided on a rotating shaft that is rotatably driven through a central portion loosely .