JP6703765B2 - Drum type concentrator - Google Patents

Description

The present invention relates to a drum-type concentrator having a cylindrical filter body having a transport spiral inside, in which a water-absorbing filter medium is run so as to be in sliding contact with the filter body to promote a drainage action and to provide a continuously stable concentrated sludge. The present invention relates to a drum type concentrator for producing.

BACKGROUND ART Conventionally, a belt-type concentrator or a drum-type concentrator for concentrating organic sludge such as sewage, night soil, or food processing wastewater is 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 concentrated sludge from the device.

As disclosed in Patent Document 1, sludges are placed on an endless belt-shaped water absorbing material, the water in the sludge is absorbed by the water absorbing material, and then the sludge is removed, and the water absorbing material is compressed. A dehydration treatment method of discharging water adsorbed by the known method 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 cylindrical body, and solid-liquid separation is performed with the filter cloth. Meanwhile, a drum type concentrator that conveys concentrated sludge with a spiral blade is known.

As disclosed in Patent Document 3, a water-absorbing endless filter cloth that is movably disposed is immersed in a stock solution, and the absorbed filter cloth is dehydrated outside a concentration tank to concentrate the stock solution. Devices are known.

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

In the belt type concentrator configured with the water-absorbent belt as in Patent Document 1, the solid content remaining on the belt does not significantly change the posture, so that the moisture inside the solid content and the water on the upper surface are not absorbed. Low concentration. It is also possible to dispose a belt-like combing device to change the posture of the solid content, but the conveying distance of the belt becomes long and the installation space becomes large.

The concentrator, which has a drum type cylindrical body formed of a filter cloth as in Patent Document 2, requires cleaning of the filter cloth against clogging. Although the compressed air is jetted from the outside of the cylindrical body to eliminate the clogging, the compressed air has a low cleaning effect and the cost due to the electricity bill and the like increases.
There are other cases where the filter cloth is washed with washing water, but in order to wash the filter cloth from the outside of the cylindrical body, the washing water flows into the inside, so it is necessary to stop the concentration operation. In addition, there is also a problem that the water absorption of the liquid adsorbed in the sludge deteriorates because the cleaning water impregnates the filter cloth.

Further, a concentrating device as described in Patent Document 3 which immerses a water absorbing filter cloth in a stock solution to concentrate it detects the amount of sludge concentrated in a concentrating tank and discharges it when a predetermined amount is reached. Therefore, it is impossible to supply a concentrated sludge generated by the concentrator to the rear stroke continue to communicate. Further, if the amount of the undiluted solution supplied is small, the concentrated sludge stays in the thickening tank for a long period of time, and the concentrated sludge deteriorates in the thickening tank, resulting in unstable treatment in the subsequent process.

The present invention provides a drum-type concentrator that combines a drum-type concentrator with a filter medium having a drainage action and has a good sludge recovery rate and can be stably concentrated.

This invention comprises a cylindrical filter body having a large number of pores, a drum body which is fixed to the inner peripheral surface of the filter body by a spiral spiral, and a supply pipe which is inserted into the drum body, and a drum. Equipped with a water-absorbing filter medium that can be run around the body and a pair of dewatering rolls that press the water-absorbing filter medium to drain the absorbed water, so that sludge can be rubbed in the drum body to stabilize complex sludge. Can be concentrated. Further, by absorbing the filtrate collected in the filter body with the water-absorbing filter medium, the concentration function is improved and the pores of the filter body can be made small, so that the sludge recovery rate is improved.

Further, since the water-absorbing filter medium is configured in an endless manner, and the washing device for washing the water-absorbing filter medium is provided while being wound around the drum body and the driving roll, it is possible to perform continuous concentration operation while washing the water-absorbing filter medium. ..

By using the supply pipe as the central axis and winding a spiral spiral around the central axis, there is no concern about sludge overflow to the next stage during operation, and a large amount of treatment operation can be supported.

According to the present invention, the solid-liquid separation can be efficiently performed by rotating the drum body to mash the sludge in the drum body and change the pressure density.
Since the water-absorbent filter media that can run freely is in sliding contact with the filter body of the drum-type concentrator, the water-absorbent filter media absorbs the filtrate accumulated in the vicinity of the pores of the filter body, reducing the filtration resistance of the filter body and improving the concentration effect. To do.
Since the surface tension effect generated in the pores of the filter can be reduced, the pore size of the pores of the filter can be reduced, and the sludge recovery rate can be improved.

1 is a schematic front view of a drum type concentrator according to the present invention. Similarly, it is a schematic longitudinal side view of a drum type concentrator. Similarly, it is a rear view of a drum type concentrator. It is a schematic front view of the drum type concentrator of Example 1 of another. It is a front view of the drum type concentrator of other Example 2. It is a front view of the drum type concentrator of other Example 3. It is a partial longitudinal side view of the drum type concentrator of other Example 4.

FIG. 1 is a schematic front view of a drum type concentrator.
A ribbon-shaped hollow spiral 2 formed by spirally forming a flat plate is fixed to the inner peripheral surface of a cylindrical filter body 1 to form a drum body 3. The filter body 1 is composed of a metal filter medium such as punching metal having a large number of pores, or a known filter cloth having a filtering function.

The water-absorbent filter medium 4 is hung around the bottom of the drum body 3, and the drum body 3 is slidably contacted with the water-absorbent filter medium 4 to run. The water-absorbent filter medium 4 has a belt shape and has an appropriate water-absorbing function, and the filtrate remaining on the cylindrical filter body 1 due to surface tension is contained in the water-absorbent filter medium 4. The water-absorbent filter medium 4 may be a known material such as a filter medium or sponge that absorbs liquid from the outside to the inside.

A pair of dewatering rolls 5 and 5 are disposed on the downstream side of the drum body 3 in the traveling direction of the water absorbent filter medium 4. The dewatering roll 5 presses the water-absorbent filter medium 4 to discharge the water-absorbed filtrate into the water-absorbent filter medium 4. Below the dewatering roll 5, a filtrate receiver 6 for storing or delivering the filtrate that falls from the compressed water-absorbing filter medium 4 is arranged.
Below the drum body 3, there is arranged a filtrate receiver 6 for storing or delivering the filtrate that has passed through the water-absorbent filter medium 4 and dropped.

FIG. 2 is a schematic vertical sectional side view of the drum type concentrator. The front and rear ends of the filter body 1 are connected to the annular outer rings 7, 7 for reinforcement. The outer ring 7 has a predetermined width in the axial direction in order to secure a running allowance at both ends of the water absorbing filter medium 4.

The outer ring 7 at the front end is provided with a lid 8 so that the sludge inside does not leak. A sludge supply pipe 9 is inserted through the lid 8. The supply pipe 9 inserted from the lid 8 supplies the sludge to the vicinity of the outer ring 7 at the front end. The supply pipe 9 is connected to a supply device (not shown). Note that the lid 8 does not have to cover the entire outer ring 7, and may have a height such that the sludge inside does not overflow.

A sprocket is formed on the outer ring 7 at the front end, and is connected to the spiral driving machine 11 by a chain 10. The outer rings 7, 7 at the front and rear ends, the cylindrical filter body 1, and the spiral 2 are integrally rotatable. By the rotation of the spiral 2, the sludge supplied near the outer ring 7 at the front end is filtered by the filter body 1, while the concentrated sludge having a reduced liquid content is conveyed toward the outer ring 7 at the rear end.
The outer ring 7 at the rear end is open, and the concentrated sludge is discharged to the concentrated sludge receiver 12 arranged below the outer ring 7.

FIG. 3 is a rear view of the drum type concentrator. Since the sludge supply pipe 9 is inserted through the opening 13 provided in the central portion of the lid 8, even if the lid 8 rotates integrally with the drum body 3, the supply pipe 9 is stably fixed in the drum body 3. The sludge can be supplied inside.

In the embodiment, the drum body 3 is rotatably driven by the chain 10, but a known joint such as a pulley or a gear can be used. Moreover, you may provide the washing|cleaning apparatus 21 which wash|cleans the filter body 1 as needed.

FIG. 4 is a schematic front view of the drum type concentrator according to another embodiment. The water-absorbent filter medium 4 to be wound around the bottom of the drum body 3 may be wound around the drum body 3 and the drive roll 15 in an endless manner as shown in FIG. 4(a), and run as shown in FIG. 4(b). Alternatively, the drive roll 15 may be configured to wind from one side to the other.

FIG. 5 is a front view of a drum type concentrator of another embodiment 2, in which a pair of return rolls 14 and 14, a drive roll 15 and a driven roll 16 are arranged above the drum body 3 and the return roll The water absorbing filter medium 4 is wound around the inside of the roll 14 and the outside of the drive roll 15 and the driven roll 16 and stretched endlessly. A roll driving machine (not shown) is connected to the drive roll 15, and by rotating the drive roll 15, the filter body 1 formed of the endless water-absorbing filter medium 4 is configured to run freely. A cleaning device 21 for cleaning the water absorbing filter medium 4 is disposed between the drive roll 15 and the driven roll 16.

Below the drum body 3, a pair of support rolls 18, 18 is arranged so as to be in sliding contact with the water absorbing filter medium 4. The positions and the number of the support rolls 18 are appropriately set according to the diameter of the drum body 3, the amount of sludge supplied, and the like.

A pair of dewatering rolls 5 and 5 is disposed downstream of the return roll 14 in the traveling direction of the water absorbent filter medium 4. The dewatering roll 5 presses the water-absorbent filter medium 4 to discharge the water-absorbed filtrate into the water-absorbent filter medium 4.

It should be noted that members that support the constituent requirements of the present device, such as a frame, bearings, ribs, etc., are appropriately arranged according to specifications and conditions.

The sludge is supplied to the vicinity of the outer ring 7 at the front end inside the drum body 3 through a supply pipe 9 by a sludge supply pump (not shown) or the like. The sludge supplied to the inside passes through the liquid component from the cylindrical filter body 1 due to the gravity concentration action.

The sludge in the filter body 1 is conveyed from the bottom to a height near the central axis along the rotation of the drum body 3, and then sludges to the bottom by its own weight. At this time, the liquid content inside the sludge is extracted on the surface by the action of mashing the sludge, and the solid-liquid separation by the filter body 1 is promoted. Due to the rotating action of the spiral spiral 2, the sludge inside is conveyed to the discharge side, and during that time, the sludge is subjected to the kneading action and further concentrated. The pitch of the spiral 2, the height of the flat plate, and the like are appropriately set according to the supply amount and the like so that the sludge to be conveyed does not overflow into the adjacent stage.

The cylindrical filter body 1 has a large number of pores. Although the opening ratio, pore size, etc. are determined according to the sludge to be supplied, it is necessary to set the pore size small in order to increase the sludge recovery rate.
When the pore size is small, when a large amount of the filtrate is discharged, it is dripped from the pores by its own weight, but when the filtrate is small, the surface tension causes the filtrate to stick to the inside of the pores or the outer peripheral surface of the filter body 1 to form the filtrate. Do not drip.

Therefore, in order to separate the filtrate adhered to the filter body due to the surface tension from the filter body 1, the water absorbing filter medium 4 is brought into sliding contact. The water-absorbent filter medium 4 has a capillary water-absorption function, and when it comes into contact with the filtrate of the filter body 1, the filtrate is absorbed by the water-absorbent filter medium 4. At the same time, the water-absorbent filter medium 4 has an excellent water-retaining function and has a function of containing the filtrate in the filter medium.

Specifically, by configuring the water absorbing filter medium 4 with a sponge or the like having a small opening ratio and fine meshes, the above-described operational effects can be achieved.

In the filter body 1 that is in sliding contact with the water-absorbent filter medium 4, the filtrate adhering to the vicinity of the pores is absorbed by the water-absorbent filter medium 4 side, so that the discharge resistance is reduced and the filtrate from the sludge is absorbed by the capillary phenomenon. It is easier to do and the processing capacity is improved. Further, even if the pore size of the pores is reduced, the drainage capacity does not decrease, so sludge removal inside the drum body 3 is reduced, and the sludge recovery rate is improved.

The position at which the water-absorbing filter medium 4 is brought into sliding contact with the filter body 1 may be a position at which the filtrate is discharged from the filter body 1, and the distance between the return rolls 14 may be varied depending on the sludge property, the supply amount, and the tension. , The height is set appropriately, and the winding angle of the water absorbing filter medium 4 is adjusted.

The degree of concentration can be adjusted by controlling the rotation speed of the drum body 3 or the traveling speed of the water absorbing filter medium 4.

When the rotation speed of the drum body 3 is slowed down, the residence time of the sludge inside becomes longer and the degree of concentration becomes higher. On the contrary, when the rotation speed of the drum body 3 is increased, the residence time of the sludge in the inside is shortened and the degree of concentration is decreased.

When the traveling speed of the water-absorbent filter medium 4 is increased, the rate at which the water-absorbent filter medium 4 comes into contact with the filter body 1 is increased, the frequency of the filtrate being accumulated in the filter body 1 is lowered, and the drainage resistance is lowered, so that the concentration is increased. Conversely, slowing the travel speed of the water filter medium 4, the ratio of water absorption filter media contacts the filtration body is lowered, enrichment since become drainage resistance increases filtrate tends accumulate in the filtration body falls.

FIG. 6 is a front view of a drum type concentrator of another embodiment 3, in which two drum bodies 3 and 3 are arranged side by side and one endless water-absorbing filter medium 4 is provided in two drum bodies 3. , I am running around 3.

The water-absorbent filter medium 4 is wound around one drum body 3 and is reversed by the return roll 14 above it, and then is wound around the other drum body 3 through the return roll 14 above the other drum body 3, and The return roll 14 is wound around the drive roll 15 and the driven roll 16.

By driving the driving roll 15 with a roll driving machine, the water absorbing filter medium 4 travels between the plurality of drums 3, 3. A pair of dewatering rolls 5 and 5 are arranged on the downstream side of each of the drum bodies 3 in the running direction of the water absorbing filter medium 4, and the drum bodies 3 discharge the absorbed water from the sludge.

In addition, the rotation of the drum body 3 may be connected to the independent spiral drive machines 11, 11 respectively, or the drum bodies 3 arranged in parallel may be connected by a chain 10 of one winding to form a single spiral drive machine 11. You may rotate at the same time.

FIG. 7 is a partial vertical cross-sectional side view of a drum type concentrator of Example 4, in which the central axis 19 has a spiral shape instead of the ribbon-shaped hollow spiral fixed to the inner peripheral surface of the filter body 1. by fixing a spiral 2a and winding Rutotomoni spiral 2a inner peripheral surface of the filtration body 1 may be formed drum body 3. 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 11.

For supplying sludge, the central shaft 19 is hollow and the sludge supply pipe 9 is also used. The supply port 20 is opened near the outer ring 7 at the front edge of the central shaft 19. By winding the spiral spiral 2a around the central shaft 19, there is no concern that sludge will overflow to the next stage.

The drum type concentrator according to the present invention is a device that improves sludge recovery rate and treatment capacity. In particular, sludge containing solids that has a complicated shape can be stably concentrated, and the dehydration treatment by a screw press or belt press in the subsequent stage does not impose a load, improving the overall manageability. is there.

1 Filter 2, 2a Spiral 3 Drum 4 Water Absorbing Filter 5 Dewatering Roll 9 Supply Pipe 15 Drive Roll 19 Center Shaft 21 Cleaning Device

Claims (3)

A cylindrical filter body (1) having a large number of pores ;
The drum body (3) is constructed by fixing the inner surface of the filter body (1) with the spiral spiral (2).
A sludge supply pipe (9) which is inserted into the drum body (3),
A water-absorbing filter medium (4) that is freely run around the drum body (3),
A pair of dewatering rolls (5) for pressing the water absorbing filter medium (4) to discharge the absorbed water,
A drum-type concentrator characterized by being equipped with.
The water absorbing filter medium (4) is configured in an endless form, and is wound around the drum body (3) and the drive roll (15),
The drum type concentrator according to claim 1, further comprising a cleaning device (21) for cleaning the water absorbent filter medium (4).
With the supply pipe (9) as the central axis (19),
The drum type concentrator according to claim 1 or 2, wherein a spiral spiral (2a) is wound around the central shaft (19).

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