JP6853949B2 - Drum type concentrator - Google Patents

Description

According to the present invention, in a drum type concentrator having a cylindrical filter body in which a transport spiral is installed, a drainage filter medium is run so as to be in sliding contact with the filter body to promote a drainage action, and continuously stable concentrated sludge. Regarding a drum type concentrator that produces.

Conventionally, a belt-type concentrator or a drum-type concentrator for concentrating organic sludge such as sewage, human waste, or food production processed wastewater is generally known. A belt-type concentrator or a drum-type concentrator is a device that continuously concentrates sludge, continuously supplies sludge to the device, and continuously discharges the concentrated sludge from the device.

As disclosed in Patent Document 1, a resin endless belt is hung between sprockets, sludge is supplied on a belt near one sprocket, and the sludge is conveyed to the other sprocket while performing solid-liquid separation with the endless belt. Belt-type concentrators for obtaining concentrated sludge are 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. A drum-type concentrator that conveys concentrated sludge with a spiral blade is known.

As disclosed in Patent Document 3, in a drum-type dehydrator that concentrates sludge with a cylindrical filter medium while transporting sludge by a screw shaft around which a spiral screw blade is wound, a punching metal or the like is used to punch the peripheral surface of the cylinder. A drum-type concentrator composed of the metal filter medium of the above is known.

JP-A-2002-253910 Jitsukaisho 56-44819 Japanese Patent No. 3832330

A belt-type concentrator as in Patent Document 1 is stable when solid-liquid separation is performed, for example, when it has a long string shape such as algae or a complicated shape in which fibers are entangled. Cannot concentrate. Specifically, since the sludge supplied on the horizontally installed belt does not change its posture on the belt while being concentrated, the liquid content accumulated above or inside the solid matter is lowered. Cannot be filtered with a belt.

Further, a concentrator in which a drum-type cylindrical body composed of a filter cloth as in Patent Document 2 has a capillary water absorption function by the filter cloth, and therefore has an excellent water absorption function from sludge, but on the other hand, has a high capillary water absorption function. The function increases the discharge resistance of the filtrate.

In a general drum type concentrator having a cylindrical screen made of punching metal or the like having a large number of pores as in Patent Document 3, when the pore diameter is increased, the discharge resistance becomes smaller and the filtrate easily escapes, but sludge also also exists. The recovery rate deteriorates because it comes off. If the pore diameter is reduced, sludge will not easily come out and the recovery rate will improve, but the discharge resistance will increase and the filter liquid will not come out easily. It is necessary to prepare sludge according to the hole diameter of the cylindrical screen, which complicates the adjustment.

The present invention provides a drum-type concentrator in which a filter medium having a drainage action is combined with a drum-type concentrator, and a sludge recovery rate is good and stable concentration is possible.

In the present invention, a drum body is composed of a cylindrical filter body having a large number of pores and a spiral spiral body fixed to the filter body and wound around a central shaft, and the central shaft is formed as a hollow supply. It is equipped with a pipe, a sludge supply port opened in the supply pipe inside the drum body, and a runnable drainage filter medium hung around the drum body . The drainage filter medium has a large opening ratio and has a water retention function inside. Without it , sludge can be kneaded inside the drum and sludge with a complicated shape can be stably concentrated. Further, by adsorbing the filtrate collected in the filter body to the drainage filter medium and dropping the filtrate, the concentration function can be improved and the pores of the filter body can be made smaller, so that the sludge recovery rate is improved. Furthermore, if the supply pipe is used as the central axis and a spiral spiral is wound around the central axis, there is no concern about sludge overflowing to the adjacent stage during operation, and a large amount of processing operation can be supported.

In addition, since the drainage filter medium is configured to be endless and hung around the drum body and the drive roll, and a cleaning device for cleaning the drainage filter medium is provided, continuous concentration operation is possible while cleaning the drainage filter medium. ..

According to the present invention, sludge is kneaded inside the drum body by rotation of the drum body, and the pressure density is changed to enable efficient solid-liquid separation.
Since the drainage filter medium that can run freely is in sliding contact with the filter body of the drum type concentrator, the filtrate that collects near the pores of the filter body is adsorbed by the drainage filter medium, and the filtration resistance by the filter body is reduced and the concentration action is improved. To do.
Since the surface tension action generated in the pores of the filter body can be reduced, the pore diameter of the pores of the filter body can be reduced, and the sludge recovery rate can be improved.

It is a schematic front view of the drum type concentrator which concerns on this invention. Similarly, it is a schematic longitudinal side view of the drum type concentrator. Similarly, it is a rear view of the drum type concentrator. It is a schematic front view of the drum type concentrator of another Example 1. It is a front view of the drum type concentrator of another Example 2. It is a front view of another drum type concentrator of Example 3. It is a partial longitudinal side view of the drum type concentrator of another Example 4. FIG.

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 the cylindrical filter body 1 to form a drum body 3. The filter body 1 is composed of a metal filter medium such as a punching metal having a large number of pores, or a known filter cloth having a filtering function.

The drainage filter medium 4 is hung around the bottom of the drum body 3 and traveled while being in sliding contact with the drum body 3. The drainage filter medium 4 is belt-shaped and has a function of allowing liquid to permeate. It comes into contact with the filtrate that remains on the cylindrical filter body 1 due to surface tension, is adsorbed on the drain filter medium 4 by capillarity, and then drains from the lower surface. As the drainage filter medium 4, a known filter medium having a liquid permeation function such as a coarse filter cloth or a net and not having a water retention function can be used.
Below the drum body 3, a filtrate receiver 6 for storing or delivering the filtrate that has passed through the drainage filter medium 4 and is dropped is arranged.

FIG. 2 is a schematic longitudinal side view of the drum type concentrator. The front and rear ends of the filter body 1 are connected to and reinforced by the annular outer rings 7 and 7. The outer ring 7 has a predetermined width in the axial direction in order to secure a running allowance at both ends of the drainage filter medium 4.

The outer ring 7 at the front end is provided with a lid 8 to prevent internal sludge from leaking. A sludge supply pipe 9 is inserted through the lid 8. The supply pipe 9 inserted through the lid 8 supplies 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). It is not necessary for the lid 8 to cover the entire outer ring 7, and it is sufficient that the lid 8 has a height at which sludge inside does not overflow.

A sprocket is formed on the outer ring 7 at the front end portion, and is connected to the spiral drive machine 11 by a chain 10. The outer rings 7 and 7 at the front and rear ends, the cylindrical filter body 1 and the spiral 2 are integrally rotatable. Due to the rotation of the spiral 2, the sludge supplied in the vicinity of the outer ring 7 at the front end is filtered by the filter body 1, while the concentrated sludge with reduced liquid content is conveyed in the direction of 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 in the center of the lid 8, the supply pipe 9 remains fixed and stable even if the lid 8 rotates integrally with the drum body 3. Sludge can be supplied to the inside of the.

In the embodiment, the drum body 3 is rotatably driven by the chain 10, but known joints such as pulleys and gears can be used. Further, a cleaning device for cleaning the filter body 1 may be provided as needed.

FIG. 4 is a schematic front view of another drum type concentrator of the first embodiment. The drainage filter medium 4 to be hung 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 may be run. as described above, by the drive rolls 1 5 may be configured to be wound from one to the other.

FIG. 5 is a front view of another drum type concentrator of the second embodiment, 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 to return. The drainage filter medium 4 is hung from the inside of the roll 14 and the outside of the driving roll 15 and the driven roll 16 to be stretched in an endless manner. A roll drive machine (not shown) is connected to the drive roll 15, and the endless drainage filter medium 4 is movably configured by rotating the drive roll 15. A cleaning device 21 for cleaning the drainage filter medium 4 is arranged between the drive roll 15 and the driven roll 16. The installation position of the cleaning device 21 is not limited to the above position, and a known method such as water / air injection or immersion may be used as the cleaning method. In addition, a cleaning liquid receiver is provided as needed.

A pair of support rolls 18 and 18 are arranged below the drum body 3 so as to be in sliding contact with the drainage filter medium 4. The positions and numbers of the support rolls 18 are appropriately arranged according to the diameter of the drum body 3, the amount of sludge supplied, and the like.

Members that support the constituent requirements of this device, such as frames, bearings, ribs, etc., are appropriately arranged according to specifications and conditions.

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

Further, 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 falls to the bottom by its own weight. At this time, the liquid content inside the sludge is extracted to the surface by the kneading action of the sludge, and the solid-liquid separation by the filter body 1 is promoted. Due to the rotational action of the spiral spiral 2, the sludge inside is transported to the discharge side, and during that time, it is further kneaded and concentrated. The pitch of the spiral 2 and the height of the flat plate are appropriately set according to the supply amount and the like so that the sludge to be conveyed does not overflow to the adjacent stage.

The cylindrical filter body 1 has a large number of pores. The aperture ratio, pore diameter, etc. are determined according to the sludge to be supplied, but in order to increase the sludge recovery rate, it is necessary to set the pore diameter small.
When the pore size is small, when a large amount of filtrate is discharged, it is dropped from the pores due to its own weight, but when the filtrate is small, the filtrate sticks to the inside of the pores or the outer peripheral surface of the filter due to surface tension and drops. do not.

Therefore, the drainage filter medium 4 is slidably contacted in order to separate the filtrate sticking to the filter body 1 due to surface tension from the filter body 1. The drainage filter medium 4 has a function of absorbing the filtrate by utilizing the capillary phenomenon, and when it comes into contact with the filtrate of the filter body 1, the filtrate is adsorbed on the drainage filter medium 4. At the same time, the drainage filter medium 4 has an excellent drainage function, has a large opening ratio, does not have a water retention function inside, and has a structure in which the filtrate can be easily dropped by its own weight.

Specifically, the above-mentioned action and effect can be obtained by forming the drainage filter medium 4 with a filter cloth, a net, or the like which is made of a hydrophilic material and has a large opening ratio and a coarse mesh.

In the filter body 1 that is in sliding contact with the drainage filter medium 4, the filtrate sticking to the vicinity of the pores is adsorbed on the drainage filter medium 4 side, so that the discharge resistance is reduced and the filter from the sludge due to the capillary phenomenon of the pores. It becomes easier to absorb the liquid and the processing capacity is improved. Further, since the drainage capacity does not decrease even if the pore diameter of the pores is reduced, the sludge removal inside the drum body 3 is reduced, and the sludge recovery rate is improved.

The position where the drainage filter medium 4 is brought into sliding contact with the filter body 1 may be a position where the filtrate is discharged from the filter body 1, and the interval between the return rolls 14 is adjusted according to the sludge property, the supply amount, and the like. , The height is set appropriately, and the winding angle of the drainage filter medium 4 is adjusted.

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

When the rotation speed of the drum body 3 is slowed down, the residence time of the sludge inside becomes long and the concentration becomes high. On the contrary, when the rotation speed of the drum body 3 is increased, the residence time of the sludge inside becomes shorter and the concentration becomes lower.

When the traveling speed of the drainage filter medium 4 is increased, the ratio of the drainage filter medium 4 coming into contact with the filter body 1 increases, the frequency of collecting the filtrate in the filter body 1 decreases, and the drainage resistance decreases, so that the concentration becomes high. Conversely, slowing the travel speed of the drainage filter medium 4, the percentage of waste water filter medium 4 in the filtration body 1 are in contact is low, enrichment since become drainage resistance increases filtrate tends accumulate in the filtration member 1 falls.

FIG. 6 is a front view of another drum type concentrator of the third embodiment, in which two drum bodies 3 and 3 are arranged side by side, and one endless drainage filter medium 4 is used as two drum bodies 3. , 3 is hung.

The drainage filter medium 4 is hung around one drum body 3, inverted by the return roll 14 above it, and then hung around the other drum body 3 via the return roll 14 above the other drum body 3, respectively. The return roll 14 is hung on the drive roll 15 and the driven roll 16.

By driving the drive roll 15 with the roll drive machine, the drainage filter medium 4 travels between the plurality of drum bodies 3.

For the rotation of the drum body 3, independent spiral drives 11 and 11 may be connected to each of them, or the drum bodies 3 arranged side by side may be connected by a chain 10 of one roll to connect a single spiral drive machine 11. May be rotated at the same time.

FIG. 7 is a partial longitudinal side view of the drum-type concentrator according to the fourth embodiment, in which the central axis 19 is spiral in place 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 drive machine 11.

For sludge supply, the central shaft 19 is hollow, and the sludge supply pipe 9 is also used. A supply port 20 is opened in the vicinity of the outer ring 7 on the front edge of the central axis 19. When the spiral spiral 2a is wound around the central axis 19, there is no concern about the overflow of sludge to the adjacent stage.

The drum type concentrator according to the present invention is an apparatus for improving sludge recovery rate and treatment capacity. In particular, sludge containing solids with a complicated shape can be stably concentrated, and the dehydration process by the screw press or belt press in the subsequent stage is not burdened, and overall manageability is improved. is there.

1 Filter 2, 2a Spiral 3 Drum 4 Drain filter media 9 Supply pipe 15 Drive roll 19 Central shaft 21 Cleaning device

Claims (2)

A cylindrical filter body (1) having a large number of pores and
The drum body (3) is composed of a spiral spiral (2a) that is fixed to the filter body (1) and wound around the central shaft (19).
A supply pipe (9) formed with the central axis (19) hollow, and
The sludge supply port (20) opened in the supply pipe (9) inside the drum body (3), and
A drainage filter medium (4) that can be freely run around the drum body (3),
Equipped with a,
The drainage filter medium (4) is a drum type concentrator characterized by having a large opening ratio and not having a water retention function inside. The drainage filter medium (4) is configured to have an endless shape, and is hung around the drum body (3) and the drive roll (15), and at the same time.
The drum-type concentrator according to claim 1, further comprising a cleaning device (21) for cleaning the drainage filter medium (4).

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