JP2021053572A - Flocculation device and concentrator-integrated dehydrator using the same - Google Patents

Abstract

To provide a flocculation device and a concentrator-integrated dehydrator using the same capable of preventing sludge discharged from the concentrator from flowing down without sufficient reaction between the sludge and flocculant supplied to the sludge, and capable of improving the dehydration of the sludge and reducing the amount of flocculant used.SOLUTION: A flocculation device includes a slope 14 which flows a sludge down in an inclined direction, a resistance part 16 which is formed in the width direction on the flowing down surface of the slope 14, and flocculant supply means 15 installed above the slope 14. A sludge flowing down from the slope 14 in an inclined direction acquires resistance from the resistance part 16. This reduces the flowing speed of the sludge and increases the residence time on the slope 14, so that the sludge and the flocculant react sufficiently to increase the flocculating property, which improves the dewatering property of the sludge and reduces the amount of flocculant used.SELECTED DRAWING: Figure 2

Description

The present invention relates to a coagulator that produces coagulated sludge by reacting sludge with a coagulant and a dehydrator with an integrated concentrator using the coagulant.

Conventionally, in Patent Document 1, in order to improve the dehydration property of sludge treated by a screw press, a concentrator is provided in the pre-stage of the screw press. A chute that receives the sludge discharged from the concentrator is arranged on the discharge side of the concentrator, and the sludge is press-fitted into the screw press by a press-fitting pump after the chute flows down. At this time, the sludge flowed down to the press-fitting pump as it was after the inorganic coagulant was added from the coagulant supply means located on the discharge side of the concentrator.

Patent Document 2 discloses a guide slope for guiding sludge discharged from a gravity concentrator to a flow-down concentrating passage in an auxiliary concentrator arranged in front of a screw press.

Patent Document 3 discloses a plurality of inclined members provided in the sludge supply section in the pre-stage of the screw press in order to promote the separation of water contained in the sludge discharged from the concentrator.

Japanese Patent No. 5477373 Japanese Patent No. 4294523 Japanese Patent No. 6091289

Patent Document 1 guides sludge discharged from a discharge port provided on the discharge side of a concentrator to a chute connected below the discharge side of the concentrator, and then uses a press-fitting pump provided in the chute to press the sludge. It is supplied and dehydrated, and a coagulant supply means for adding a coagulant to sludge is provided on the discharge side of the concentrator. However, the space from the discharge port of the concentrator to the press-fitting pump is not provided with a device or the like for sufficiently reacting the sludge with the coagulant. Therefore, the sludge discharged from the discharge port falls to the chute without sufficiently reacting with the coagulant after the coagulant is added from the coagulant supply means. There is a problem that the dehydration property of the cake discharged from the screw press is deteriorated by supplying the cake to the screw press in a state where the agglomeration is insufficient.

In Patent Document 2, a coagulant is added to the sludge supplied into the auxiliary concentrator from a coagulant spray pipe provided above the auxiliary concentrator, but the surface of the guide slope for flowing the sludge is surface. Because it is flat, it has low resistance to sludge. Therefore, the sludge flows down in a short time without staying on the guide slope, and is guided to the flow-down concentration passage without sufficiently reacting with the flocculant.
The flow-down concentration passage is provided with a screw for re-aggregating the sludge and the coagulant while flowing the sludge to the sludge outlet path, but there is a problem that the cost of driving the screw is high.

In Patent Document 3, a plurality of sludge members are provided in a sludge supply unit arranged on the discharge side of the concentrator, and sludge discharged from the concentrator is sequentially flowed down from the upper inclined member to the lower inclined member into the sludge. It promotes the separation of the contained water, but since the surface of the inclined member is flat, the resistance to sludge flowing down the inclined member is small. Therefore, the sludge flows down from the inclined member to the inclined member in a short time, and sufficient water cannot be separated. Further, since the sludge does not spread in the width direction on the inclined member and the area in contact with the added coagulant becomes small, there is a problem that the sludge and the coagulant flow down without sufficiently reacting with each other.

The present invention has been made in view of the above problems, and by providing an inclined plate having a resistance portion formed below the discharge side of the concentrator, the sludge and the coagulant flow down with insufficient reaction. Provided are a coagulation device capable of preventing sludge dewatering property and reducing the amount of coagulant used, and a dewatering machine integrated with a concentrator using the coagulation device.

The present invention provides sludge by providing an inclined plate that allows sludge to flow down in an inclined direction, a resistance portion formed in the width direction on the flow lower surface of the inclined plate, and a cohesive agent supplying means provided above the inclined plate. Since the flocculant reacts sufficiently, the cohesiveness is enhanced.

By forming a convex resistance portion on the flow lower surface of the inclined plate, the sludge flowing down on the inclined plate is blocked by the convex resistance portion to reduce the flow speed and react with the flocculant. You can secure enough time. Further, after the sludge is dammed, it spreads in the width direction of the inclined plate to increase the surface area and improve the efficiency of adding the coagulant.
Further, when a concave resistance portion is formed on the flow lower surface of the inclined plate, the sludge flowing down on the inclined plate flows into the concave resistance portion, so that the flow speed is reduced, and the same effect as that of the convex resistance portion is obtained. Is obtained.

By forming the resistance portion by bending the inclined plate in a convex shape, the sludge flowing down on the inclined plate collides with the curved convex resistance portion and is blocked.
Further, when the inclined plate is curved in a concave shape to form a resistance portion, the sludge flowing down on the inclined plate flows into the curved concave resistance portion, so that the flow speed is reduced and the resistance portion is curved in a convex shape. The same effect as is obtained.

By alternately forming the convex resistance portion and the concave resistance portion in the inclination direction of the inclined plate, the sludge flowing down is alternately resisted by the convex resistance portion and the concave resistance portion, and the flow speed is increased. descend.

The coagulator according to any one of claims 1 to 6, further comprising a dehydrator, a concentrator mounted on the dehydrator, and a sludge chute connected to the discharge side of the concentrator. By providing the above, the strong flocs generated during the flow can be supplied to the dehydrator, so that the dehydration performance is improved.

As described above, in the present invention, the resistance is given to the sludge flowing down by forming the resistance portion on the flow bottom surface of the inclined plate. The flow speed of sludge decreases due to the resistance of the resistance portion, and the residence time on the inclined plate becomes long. As a result, it is possible to secure a sufficient time for the sludge to react with the cohesive agent, so that the cohesiveness is enhanced and the amount of the cohesive agent used can be reduced. In addition, due to its own weight, the sludge mixes with the cohesive agent while flowing down on the inclined plate to generate cohesive sludge, so that it is possible to improve cohesiveness without the need for a new power source and generate strong cohesive sludge. it can. By providing the coagulation device in the rear stage of the concentrator and the front stage of the dewatering machine, the coagulating sludge in which strong flocs are generated can be supplied to the dewatering machine, so that the dewatering performance is improved.

It is a schematic side view of the concentrator integrated dehydrator using the coagulation device which concerns on this invention. Similarly, it is a schematic front view of a dehydrator integrated with a concentrator using a coagulator. It is a main part perspective view of the 1st form of the coagulation apparatus which concerns on this invention. Similarly, it is a perspective view of the main part of the second form of the aggregating device. Similarly, it is a perspective view of the main part of the third form of the aggregating device. Similarly, it is a perspective view of the main part of the fourth form of the aggregating device. Similarly, it is a perspective view of the main part of the fifth form of the aggregating device. It is a schematic front view of another embodiment of the concentrator integrated dehydrator using the coagulation device which concerns on this invention.

FIG. 1 is a schematic side view of a dehydrator integrated with a concentrator using the coagulation device according to the present invention.
The dehydrator integrated with the concentrator includes a dehydrator 1, a concentrator 2 mounted on the dehydrator 1, a chute 3 connected to the discharge side of the concentrator 2 and receiving sludge discharged from the concentrator 2. It is provided at the starting end of the dehydrator 1 and includes a press-fitting pump 4 for press-fitting the sludge received by the chute 3 into the dehydrator 1. In this embodiment, a screw press is used as the dehydrator 1. Further, the chute 3 is connected to the suction side of the press-fit pump 4, and the dehydrator 1 is connected to the discharge side of the press-fit pump 4.

The concentrator 2 has a screw shaft 7 around which a screw blade 6 is wound inside a cylindrical outer cylinder screen 5, and a screw blade 6 spirals between the outer cylinder screen 5 and the outer peripheral surface of the screw shaft 7. The concentration chamber 8 is formed. A sludge supply pipe 9 for supplying sludge into the screw shaft 7 is connected to one end of the screw shaft 7, and a drive machine 10 for rotating the outer cylinder screen 5 and the screw shaft 7 at a differential speed is connected to the other end. Is provided. Further, a plurality of supply ports 11 for guiding the sludge supplied from the sludge supply pipe 9 into the concentration chamber 8 are provided on the outer peripheral surface on one end side of the screw shaft 7, and the sludge is guided to the concentration chamber 8. , The outer cylinder screen 5 and the screw shaft 7 rotate at a differential speed to flow down to the discharge side of the concentrator 2. At this time, the filtrate is separated from the outer cylinder screen 5, and the concentrated sludge is discharged from the discharge side of the concentrator 2, then flows down into the chute 3 and is press-fitted into the dehydrator 1 by the press-fitting pump 4. ..

FIG. 2 is a schematic front view of a dehydrator with an integrated concentrator using a coagulator.
The discharge side of the outer cylinder screen 5 is composed of a disk-shaped outer cylinder flange 12. A plurality of discharge ports 13 are provided inside the outer cylinder flange 12 along the circumferential direction, and the sludge concentrated in the concentration chamber 8 is discharged from the discharge port 13. Each discharge port 13 has a shape extending in the circumferential direction. The sludge discharged from the discharge port 13 flows down on the inclined plate 14 provided below the outer cylinder flange 12 and above the chute 3 and is guided to the chute 3. When sludge flows down on the inclined plate 14, a coagulant such as polyiron sulfate is supplied from a plurality of coagulant supplying means 15 provided above the inclined plate 14. In the present embodiment, a known coagulant supply means 15 such as a pipe or a nozzle is used for dropping, spraying, or the like, but the supply method is not particularly limited. Further, the position and number of the coagulant supply means 15 may be changed as appropriate.

The inclined plate 14 extends obliquely to the lower right and diagonally to the lower left from the end points located on the vertical line at the center of the screw shaft 7. The sludge flow bottom surface in the inclined direction has a structure in which irregularities are repeated. The convex and concave shapes in the inclined direction are the resistance portions 16, and the resistance portions 16 give resistance to the sludge flowing down. By adding resistance to the sludge that flows down, the flow rate of the sludge decreases, the residence time on the inclined plate 14 becomes long, and the sludge can be expanded in the width direction of the inclined plate 14 to increase the surface area.

FIG. 3 is a perspective view of a main part of the first embodiment of the aggregating device according to the present invention.
In (a), convex resistance portions 16 are formed on an inclined plate 14 made of a flat plate at predetermined intervals in the inclined direction, and are continuously formed over the width direction. In the first form, the cross section of the resistance portion 16 is formed in a rectangular shape.
In (b), convex resistance portions 16 are formed on the inclined plate 14 at predetermined intervals in the inclined direction and discontinuously formed in the width direction. The cross section of the resistance portion 16 is formed in a chevron shape.

The convex resistance portions 16 of (a) and (b) serve as resistance for the flow of sludge and temporarily block the sludge. Since the sludge that has been dammed has a reduced flow rate and a long residence time on the inclined plate 14, it is possible to secure a sufficient time for reacting with the coagulant. Further, after the sludge is dammed, it spreads in the width direction and the surface area is increased, so that the efficiency of adding the coagulant is improved. The sludge that has spread in the width direction of the inclined plate 14 is further swept downstream as the sludge flows down from the subsequent stage.

In addition, the sludge flows down on the inclined plate 14 due to its own weight and mixes with the cohesive agent to generate cohesive sludge, so that the cohesiveness can be enhanced without requiring new power. Further, if the resistance portion 16 is configured to be detachable from the inclined plate 14, inspection / replacement at the time of maintenance becomes easy. The resistance portions 16 may be formed in a chevron shape at predetermined intervals in the inclination direction and may be continuously formed in the width direction. Further, the rectangular shapes may be formed at predetermined intervals in the inclination direction and discontinuously arranged in the width direction. Further, these may be combined to form a resistance portion, but the present invention is not limited to this.

FIG. 4 is a perspective view of a main part of the second form of the aggregating device.
In (a), concave resistance portions 16 are formed on the flow bottom surface of the inclined plate 14 made of a flat plate at predetermined intervals in the inclined direction, and are continuously formed over the width direction. In the second form, the cross section of the resistance portion 16 is formed in a rectangular shape.
In (b), concave resistance portions 16 are formed on the flow surface of the inclined plate 14 at predetermined intervals in the inclined direction and discontinuously formed in the width direction.
In the agglutinating device of (a) and (b), the flowing sludge flows into the resistance portion 16 formed on the flat plate, so that the flowing speed decreases. The resistance portion 16 may be a combination of a rectangle and a chevron, but is not limited to this.

FIG. 5 is a perspective view of a main part of the third form of the aggregating device.
In (a), a part of the inclined plate 14 made of a flat plate is curved in a convex shape in the width direction, and the curved convex resistance portions 16 are formed at predetermined intervals in the inclined direction. ..
In (b), a part of the inclined plate 14 made of a flat plate is concavely curved in the width direction, and the curved concave resistance portions 16 are formed at predetermined intervals in the inclined direction.

FIG. 6 is a perspective view of a main part of the fourth form of the aggregating device.
The inclined plate 14 is curved, and convex resistance portions 16 and concave resistance portions 16 are alternately formed in the inclined direction. In the fourth form, the curved convex resistance portion 16 of (a) and the curved concave resistance portion 16 of (b) in the third form are alternately formed in the inclined direction, and the cross section is sinusoidal. It is formed in a curved shape.

FIG. 7 is a perspective view of a main part of the fifth form of the aggregating device.
The inclined plate 14 is formed in a zigzag manner, and the convex resistance portion 16 and the concave resistance portion 16 are alternately formed in the inclined direction. When the inclination angle β of the resistance portion 16 is an acute angle of 90 degrees or less, the height a from the apex of the convex resistance portion 16 to the bottom of the concave resistance portion 16 becomes high.
On the other hand, when the inclination angle β is larger than 90 degrees and smaller than 180 degrees, the height a becomes low. The cross section of the resistance portion 16 may be a combination of a sinusoidal curve and a zigzag shape, but the cross section is not limited to this. Further, the inclination plate 14 can be appropriately changed in thickness, inclination angle β, length in the inclination direction / width direction, position of end point, etc. according to specifications and sludge properties.

FIG. 8 is a schematic front view of another embodiment of the concentrator integrated dehydrator using the coagulation device according to the present invention.
A chute 3 that receives sludge discharged from the discharge port 13 is connected to the discharge side of the concentrator 2. Further, a plurality of inclined plates 14 and a plurality of coagulant supplying means 15 are provided on the side wall in the chute 3. The inclined plate 14 provided on one side wall is installed so as to descend toward the other side wall. Similarly, the inclined plate 14 provided on the other side wall is installed so as to descend toward one side wall. By sequentially installing this downward on the left and right alternately, the sludge supplied into the chute 3 flows down on each inclined plate 14 so as to alternately jump, and then flows down.
Since the sludge flowing down on the inclined plate 14 has a water flow rate higher than that of the solid content, the water content and the solid content are separated by this speed difference. At this time, the resistance portion 16 of the inclined plate 14 gives resistance to the sludge flowing down, so that the flowing speed is lowered, the residence time on the inclined plate 14 is lengthened, and the cohesiveness is improved.

The coagulant supply means 15 is arranged so as to face the inclined plate 14. Specifically, the flocculant supply means 15 is arranged on the other side wall with respect to the inclined plate 14 arranged on one side wall, and one inclined plate is arranged with respect to the inclined plate 14 arranged on the other side wall. The flocculant supply means 15 is arranged at 14. By arranging the sludge so as to face the inclined plate 14, it is possible to supply the coagulant to the sludge that flows down while jumping on the plurality of inclined plates 14 provided on the side wall. The sludge sufficiently reacts with the flocculant on the inclined plate 14 and flows downward, so that strong flocs are formed. This makes it possible to prevent the flock from being destroyed by the impact when it is dropped.
In this embodiment, the coagulant was applied to the dehydrator integrated with the concentrator, but it is not limited to the device with the concentrator and the dehydrator integrated, and the pipeline and belt conveyor installed on the discharge side of the concentrator. It can also be applied to a mechanism that allows sludge to flow down. Further, as a concentrator, application to a known concentrator such as a belt concentrator and a gravity concentrator, and as a dehydrator, application to a known dehydrator such as a belt press, a filter press, a vacuum dehydrator, and a centrifugal dehydrator. Is also possible.

Since the aggregating device according to the present invention can generate agglomerated sludge during the flow of sludge, it can be easily applied to an existing treatment flow. Further, since the structure of the apparatus is simple and the space is saved, it can be easily applied to the rear stage of the concentrator or the front stage of the dehydrator. The coagulation device can be applied to all devices (dehydrators, etc.) that add a coagulant to sludge and utilize the coagulation sludge. In particular, by applying it to a dehydrator with an integrated concentrator, from concentration to dehydration. Sludge can be treated stably in the above process. Further, since the cohesive device utilizes the own weight of the sludge, it is not necessary to newly provide a device or the like that requires power in order to enhance the cohesiveness of the sludge.

14 Inclined plate 16 Resistor 15 Coagulant supply means 1 Dehydrator 2 Concentrator 3 Shoot

Claims (7)

An inclined plate (14) that allows sludge to flow down in an inclined direction,
A resistance portion (16) formed in the width direction on the flow surface of the inclined plate (14) and
The coagulant supply means (15) provided above the inclined plate (14) and
A coagulation device comprising. The agglutinating device according to claim 1, wherein a convex resistance portion (16) is formed on the flow surface of the inclined plate (14). The agglutinating device according to claim 1 or 2, wherein a concave resistance portion (16) is formed on the flow bottom surface of the inclined plate (14). The agglutinating device according to claim 1, wherein the inclined plate (14) is curved in a convex shape to form a resistance portion (16). The agglutinating device according to claim 1 or 4, wherein the inclined plate (14) is curved in a concave shape to form a resistance portion (16). The aggregating device according to claim 3 or 5, wherein convex resistance portions (16) and concave resistance portions (16) are alternately formed in the inclined direction of the inclined plate (14). Dehydrator (1) and
The concentrator (2) mounted on the dehydrator (1) and
The sludge chute (3) connected to the discharge side of the concentrator (2) and
With
A dehydrator with an integrated concentrator, wherein the chute (3) is provided with the agglutinating device according to any one of claims 1 to 6.

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