JP2018094469A - Drum type thickener with travelling water-absorbing belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type thickener with a travelling absorption belt having a filter body composed of a travelling belt.SOLUTION: A drum type thickener includes a rotatable spiral 1 of which both ends are connected to an annular outer ring 6, a travelling absorption belt 2 wound around the spiral 1, dewatering rollers 4 for pressing the absorption belt 2 to discharge water, and a supply pipe 8 inserted in a drum body 3 composed of the spiral 1 around which the absorption belt 2 is wound. Sludge is softened in the drum body 3 by travelling absorption belt 2 and rotating spiral 1. Compactness of the sludge is thus changed leading to efficient solid-liquid separation.SELECTED DRAWING: Figure 1

Description

  The present invention provides a drum-type concentrator having a cylindrical filter stretched around a conveying spiral, wherein the filter is composed of a water-absorbing belt that can run freely, and is continuously stable while collecting filtrate from the water-absorbing belt. The present invention relates to a drum-type concentrator that absorbs water and generates a concentrated sludge.

Conventionally, belt-type concentrators or drum-type concentrators that concentrate organic sludge such as sewage, human waste, or food production processing wastewater are generally known. A belt-type concentrator or a drum-type concentrator is a device for continuously concentrating sludge, continuously supplying sludge to the device, and continuously discharging the concentrated sludge from the device.

As disclosed in Patent Document 1, sludge is placed on an endless belt-shaped water-absorbing material, the water in the sludge is absorbed by the water-absorbing material, the sludge is removed, and the water-absorbing material is compressed. A dehydration method for discharging the adsorbed water is known.

As disclosed in Patent Document 2, in a cylindrical drum type dehydrator in which a spiral blade is surrounded by a filter cloth, sludge is supplied to the inside to rotate the cylinder, and solid-liquid separation is performed using the filter cloth. Drum type concentrators that convey concentrated sludge with spiral blades are known.

As disclosed in Patent Document 3, a water-absorbing endless filter cloth disposed so as to run freely is immersed in the stock solution, and the water-absorbed filter fabric is dehydrated outside the concentration tank to concentrate the stock solution. The apparatus is known.

JP 55-94694 A Japanese Utility Model Publication No. 56-44819 Japanese Patent No. 3636355

The belt-type concentrator configured with a water-absorbing belt as in Patent Document 1 has a large solid content remaining on the belt and does not change its posture, so that the moisture inside the solid content and the upper surface is not absorbed. Concentration is low. In addition, it is possible to change the posture of the solid content by arranging a crushing device in the form of a belt, but the conveying distance of the belt becomes long and the installation space becomes large.

The concentrator which comprises the drum-type cylindrical body like patent document 2 with the filter cloth needs washing | cleaning of the filter cloth with respect to clogging. Although clogging is eliminated by injecting compressed air from the outside of the cylindrical body, the cleaning effect is low with compressed air, and the cost due to electricity costs and the like also increases.
There are other cases in which the filter cloth is washed with washing water. However, in order to wash the filter cloth from the outside of the cylindrical body, the washing operation flows into the inside, so it is necessary to stop the concentration operation. In addition, when the washing water impregnates the filter cloth, there is a problem that the water absorption of the liquid adsorbed on the sludge is deteriorated.

Moreover, the concentration apparatus which immerses and concentrates the water absorption filter cloth like patent document 3 is discharged | emitted when the amount of sludge concentrated in the concentration tank is detected and it reaches predetermined amount. Therefore, the concentrated sludge produced | generated with this concentration apparatus in the back stroke cannot be supplied continuously. Furthermore, when the supply amount of the stock solution is small, there is a problem that the period during which the concentrated sludge stays in the concentration tank becomes long, and the concentrated sludge is denatured in the concentration tank and the treatment in the subsequent process is not stable.

  This invention combines the excellent functions of a water-absorbing belt type concentrator and a drum type concentrator in order to concentrate concentrated sludge in a stable manner. Provided is a drum-type concentrator capable of running a water-absorbing belt.

The present invention relates to a water-absorbing belt traveling drum type concentrator that supplies sludge to the inside of a drum body having a filter body stretched around it, and concentrates the sludge while rotating the drum body. A rotating spiral spiral connected, a running water absorbing belt constructed of a water absorbing body, wound around the spiral, a dewatering roll that presses the water absorbing belt to discharge the absorbed water, and a water absorbing belt is wound around And a supply pipe inserted through the inside of the drum body constituted by a spiral, so that efficient solid-liquid separation can be achieved by dissolving sludge in the drum body and changing the pressure density.

In addition, since the belt is configured in an endless manner, wound around the spiral and the drive roll, and provided with a cleaning device for cleaning the water absorbing belt, continuous concentration operation is possible.

Further, if a pair of return rolls are arranged above the spiral and the distance between the pair of return rolls is equal to or less than the diameter of the spiral, sludge remaining on the belt is centered along the running of the belt from the bottom of the drum body. After being transported to the vicinity of the shaft, it surely falls to the bottom by its own weight. The sludge disintegration during sludge extraction extracts the liquid content inside the sludge to the surface, facilitating solid-liquid separation by the belt.

When the supply pipe is the central axis and a spiral spiral is wound around the central axis, there is no risk of sludge overflowing to the adjacent stage during operation, and a large amount of treatment operation can be handled.

According to this invention, since the filter body of the drum type concentrator is constituted by the water absorption belt that can run freely, the water absorption belt absorbs a fixed amount of water, and the continuous concentration operation is performed.
By absorbing the sludge in the drum body by running the water absorption belt and rotating the spiral, and changing the pressure density, for example, even sludge in a long string shape or sludge with intertwined fibers is efficient. Solid-liquid separation becomes possible.

It is a schematic front view of the water-absorbing belt traveling drum type concentrator according to the present invention. Similarly, it is a schematic longitudinal side view of a water-absorbing belt traveling drum type concentrator. Similarly, it is a rear view of a water-absorbing belt traveling type drum type concentrator. It is a schematic front view of the water absorption belt traveling type drum type concentrator of other Example 1. It is a front view of the water absorption belt traveling type drum type concentrator of other Example 2. It is a front view of the water absorption belt traveling type drum type concentrator of other Example 3. It is a partial longitudinal cross-sectional side view of the water absorption belt traveling type drum type concentrator of other Example 4.

  FIG. 1 is a front view of a water-absorbing belt traveling drum type concentrator. A drum body 3 is configured by winding a water absorbent body (water absorbent belt 2) around an outer peripheral end of a ribbon-shaped hollow spiral 1 in which a flat plate is spirally formed. The water absorption belt 2 is hung so as to cover the bottom of the spiral 1 on the horizontal axis. The water-absorbing belt 2 can be made of a known material that absorbs liquid from the outside with a nonwoven fabric, sponge, or the like and retains the water inside.

A pair of dewatering rolls 4, 4 are disposed on the downstream side of the drum body 3 in the running direction of the water absorbing belt 2. The water absorption belt 2 is pressed by the dewatering roll 4, and the filtrate absorbed in the water absorption belt 2 is discharged. Below the dewatering roll 4, a filtrate receiver 5 that stores or delivers filtrate that falls from the compressed water absorption belt 2 is disposed.

FIG. 2 is a partially longitudinal side view of the water-absorbing belt traveling drum concentrator. The front and rear ends of the spiral 1 are connected to the annular outer rings 6 and 6 and are formed in a cylindrical shape. The outer ring 6 has a predetermined width in the axial direction in order to secure a running allowance at both ends of the water absorbing belt 2.

The outer ring 6 at the front end is provided with a lid 7 so that internal sludge does not leak. A sludge supply pipe 8 is inserted through the lid 7. The supply pipe 8 inserted from the lid 7 supplies sludge to the vicinity of the outer ring 6 at the front end. The supply pipe 8 is connected to a supply device (not shown). The lid 7 does not need to cover the entire outer ring 6 and may have a height at which the internal sludge does not overflow.

A sprocket is formed on the outer ring 6 at the front end, and is connected to a spiral drive 10 by a chain 9. The outer rings 6 and 6 and the spiral 1 at the front and rear ends are configured to be rotatable together. Due to the rotation of the spiral 1, the sludge supplied to the inside is absorbed by the water-absorbing belt 2 wound around, and the concentrated sludge having a reduced liquid content is conveyed toward the outer ring 6 at the rear end. .
The outer ring 6 at the rear end is open, and the concentrated sludge is discharged to a concentrated sludge receiver 11 disposed below the outer ring.

  FIG. 3 is a rear view of the water-absorbing belt traveling drum type concentrator. Since the sludge supply pipe 8 is inserted through the opening 12 at the center of the lid 7, even if the lid 7 rotates together with the spiral 1, the supply pipe 8 is stably fixed in a fixed state. Sludge can be supplied inside.

  In the embodiment, the spiral 1 is driven to rotate freely by the chain 9, but a known joint such as a pulley or a gear can be used.

FIG. 4 is a schematic front view of a drum type concentrator of another embodiment 1. For example, as shown in FIG. 4 (a), the water absorbing belt 2 may be run endlessly around the spiral 1 and the driving roll 14, and as shown in FIG. You may comprise so that it may wind up.

FIG. 5 is a front view of a water-absorbing belt traveling drum type concentrator of another embodiment 2, and a pair of return rolls 13, 13, a drive roll 14 and a driven roll 15 are disposed above the spiral 1. And the water absorption belt 2 is wound around from the inner side of the return roll 13 and the outer side of the drive roll 14 and the driven roll 15, and is stretched endlessly. A roll driving machine (not shown) is connected to the driving roll 14, and the water absorbing body formed by the endless water absorbing belt 2 is configured to run by rotating the driving roll 14. A cleaning device 18 for cleaning the water absorbing belt 2 is disposed between the drive roll 14 and the driven roll 15.

A pair of support rolls 17 and 17 are disposed below the drum body 3 so as to be in sliding contact with the water absorbing belt 2. The position and number of the support rolls 17 are appropriately arranged according to the diameter of the drum body 3, the amount of sludge supplied, and the like.

  A pair of dewatering rolls 4, 4 are disposed on the downstream side of the drum body 3 in the running direction of the water absorbing belt 2. The water absorption belt 2 is pressed by the dewatering roll 4, and the filtrate absorbed in the water absorption belt 2 is discharged.

It should be noted that members that support the structural requirements of the present apparatus, such as frames, bearings, ribs, etc., are appropriately arranged according to specifications and conditions.

  The sludge is supplied to the vicinity of the outer ring 6 at the front end inside the drum body 3 through a supply pipe 8 by a sludge supply pump or the like (not shown). The sludge supplied to the inside absorbs liquid from the water absorption belt 2 by the gravity concentration action.

The sludge remaining on the water absorbing belt 2 is transported from the bottom of the drum body 3 to a height near the central axis along the running of the water absorbing belt 2 and then falls to the bottom by its own weight. At this time, the liquid content in the sludge is extracted on the surface by the sludge decontamination action, and solid-liquid separation by the water absorption belt 2 is promoted.

  The water absorbing belt 2 wound around the spiral 1 is caused to travel upward so that the sludge that moves following the water absorbing belt 2 in the drum body 3 falls to the bottom by its own weight. It is desirable to arrange the interval between the return rolls 13 and 13 to be equal to or smaller than the diameter of the spiral 1 and wind the water absorbing belt 2 above the central axis of the spiral 1. Moreover, according to the winding angle of the water absorption belt 2, tension | tensile_strength, etc., the space | interval and height of the return roll 13 are set suitably.

  In this embodiment, a pair of dewatering rolls 4, 4 are disposed to discharge the absorbed moisture, but the dewatering roll 4 is disposed independently facing the return roll 13, the drive roll 14, or the driven roll 15. May be. Moreover, you may arrange | position the washing | cleaning apparatus 18 for wash | cleaning the water absorption belt 2 as needed.

  Independent of the running of the water absorbing belt 2, the sludge inside is conveyed to the discharge side by the rotating action of the spiral spiral 1, and is further concentrated by receiving the squeezing action therebetween. The pitch of the spiral 1 and the height of the flat plate are appropriately set according to the supply amount so that the sludge to be conveyed does not overflow to the adjacent stage.

The degree of concentration can be adjusted by controlling the rotational speed of the spiral 1 or the traveling speed of the water absorbing belt 2.

When the rotation speed of the spiral 1 is slowed down, the sludge residence time inside becomes longer and the concentration becomes higher. Conversely, when the rotational speed of the spiral 1 is increased, the residence time of the internal sludge is shortened, and the degree of concentration is lowered.

When the traveling speed of the water absorbing belt 2 is increased, the portion that has absorbed moisture passes early, and the ratio of the sludge coming into contact with the water absorbing belt 2 that does not contain liquid is increased, and the degree of concentration is increased. On the contrary, when the running speed of the water absorbing belt 2 is slowed down, the portion that has absorbed moisture stays longer, the ratio of sludge coming into contact with the water absorbing belt 2 that does not contain liquid is reduced, and the degree of concentration decreases.

  FIG. 6 is a front view of a water-absorbing belt traveling drum type concentrator of another embodiment 3, in which two drum bodies 3 and 3 are juxtaposed and two endless water-absorbing belts 2 are provided. It is hung around the drum.

  The water absorption belt 2 is wound around one spiral 1 and reversed by a return roll 13 above the spiral, and then is wound around the other spiral 1 via a return roll 13 above the other spiral 1. From the drive roll 14 and the driven roll 15.

  The water absorption belt 2 travels between the plurality of spirals 1 and 1 by driving the driving roll 14 with a roll driving machine.

  A pair of dewatering rolls 4, 4 are disposed on the downstream side of each drum body 3 in the running direction of the water absorption belt 2, and the water absorbed from the sludge by the drum body 3 is discharged.

  The spiral 1 may be rotated by connecting independent spiral drivers 10, 10, or the spirals 1, 1 arranged side by side are connected by a single chain 9, and a single spiral driver 10 is connected. May be rotated simultaneously.

FIG. 7 is a partially longitudinal side view of a water-absorbing belt traveling drum type concentrator according to another embodiment 4, and instead of a ribbon-shaped hollow spiral formed of a flat plate, a spiral spiral 1a formed on a central shaft 19 is formed. It may be formed by winding. In this case, the central shaft 19 may be extended from the drum body 3, and the central shaft 19 may be connected to the spiral driving machine 10.

The sludge is supplied by using the sludge supply pipe 8 with the central shaft 19 being hollow. A supply port 20 is opened near the outer ring 6 on the front edge of the central shaft 19. When the spiral spiral 1a is wound around the central shaft 19, there is no fear of overflow of sludge to the next stage.

The water-absorbing belt traveling drum type concentrator according to the present invention is an apparatus that can continuously concentrate even sludge containing solid components having a complicated shape. For example, sludge in the form of a long string or sludge entangled with fibers can be concentrated stably, and no load is applied to the dehydration process by the subsequent screw press or belt press. Manageability is improved.

DESCRIPTION OF SYMBOLS 1,1a Spiral 2 Water absorption belt 3 Drum body 4 Dehydration R-ru 6 Outer ring 8 Supply pipe 13 Return roll 14 Drive roll 18 Cleaning device 19 Center axis

Claims (4)

In the water-absorbing belt traveling drum type concentrator for supplying sludge to the inside of the drum body (3) having a filter body stretched around it and concentrating the sludge while rotating the drum body (3),
A rotatable spiral spiral (1) having an annular outer ring (6, 6) connected to both ends;
A water-absorbing belt (2) that can run around the spiral (1) and is composed of a water-absorbing body,
A dewatering roll (4) for discharging the absorbed moisture by pressing the water absorbing belt (2);
A sludge supply pipe (8) inserted into the drum body (3) constituted by the spiral (1) around which the water absorption belt (2) is wound;
A water-absorbing belt traveling type drum type concentrator.
The water-absorbing belt (2) is endlessly configured and is wound around the spiral (1) and the drive roll (14).
The water-absorbing belt traveling type drum concentrator according to claim 1, further comprising a cleaning device (18) for cleaning the water-absorbing belt (2).
A pair of return rolls (13, 13) is disposed above the spiral (1),
The interval between the return rolls (13, 13)
The water-absorbing belt traveling drum type concentrator according to claim 1 or 2, wherein the diameter is equal to or less than the diameter of the spiral (1).
The supply pipe (8) is the central axis (19),
The water-absorbing belt traveling drum type concentrator according to any one of claims 1 to 3, wherein a spiral spiral (1a) is wound around the central shaft (19).

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