JPH08131720A - Method and apparatus for concentrating muddy water - Google Patents

Abstract

PURPOSE: To prevent a solid content from adhering on the inner wall of a cylindrical fabric in an apparatus for concentrating a muddy water by immersing the cylindrical fabric with a permeable wall in water in a filtrate tank, making a filtrate permeate through the permeable wall of the cylindrical fabric and discharging it. CONSTITUTION: A filtrate tank 3 is closed with a tightly closing lid 31 and a pressure water is fed into the filtrate tank to make water permeate reversely into a cylindrical fabric 22. The cylindrical fabric 22 is made into a structure prepd. by knitting a linear body such as a nylon monofilament as a weft so as not to be crushed down.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is a preliminary treatment of mud in nature such as rivers and lakes, or mud of low concentration generated by industrial activities, before introducing it into a sedimentation tank or a solid content separation device. The present invention relates to a method for simply concentrating to a concentration of 1 and improvement of the apparatus.

[0002]

2. Description of the Related Art The present inventors previously passed a low-concentration muddy water containing a solid content of about 3 to 5% through a tubular cloth to continuously leach the filtrate from the muddy water to transform the low-concentration muddy water into a high-concentration muddy water. West,
We have developed a technology to reduce the amount of muddy water by concentration and facilitate handling of muddy water (Japanese Patent Application No. 6-95195).

The technique is to increase the concentration of muddy water in a passage by passing muddy water through a water passage made of a tubular cloth having a permeable wall and allowing the filtrate to leach out of the water passage through the permeable wall. Is a method of concentrating muddy water. If this water passage is immersed in the filtrate tank, if the water passage is stopped, it penetrates through the wall of the tubular fabric and the filtrate enters the water passage in the opposite direction, and the concentration of muddy water in the water passage becomes low. Therefore, clogging due to solid content does not occur in the water passage.

The apparatus is provided with a pump for submerging a water passage made of a tubular cloth in the filtrate tank and for passing muddy water through the water passage.

[0005]

In this device, although it is said that the inner wall of the tubular cloth is not clogged by mud or the like as described above, the inner wall of the tubular cloth is not covered by solid matter such as mud. The tendency to deposit is unavoidable. Therefore, it is preferable to positively remove the accumulation of mud.

The present invention relates to an improvement of the above technique,
It is an object of the present invention to provide a technique for peeling off mud adhered to the inner surface of a tubular cloth or preventing accumulation of the mud, thereby preventing a decrease in muddy water treatment capacity. Another object of the present invention is to provide an apparatus for further sedimenting and removing a minute amount of mud contained in clear water leached from a tubular cloth.

[0007]

According to the present invention, muddy water is passed through a water passage made of a tubular fabric having a permeable wall, and the filtrate is leached out of the water passage from the permeable wall to prevent the passage of the water inside the passage. In the method of concentrating muddy water, the method of concentrating muddy water is characterized in that a pressure step of making the outer surface side of the tubular cloth higher than the inner surface side is provided. By providing this pressurizing step, it is possible to remove the mud adhered to the inner surface of the water passage made of the tubular cloth. A device capable of suitably carrying out this method is a muddy water concentrating device comprising a water passage made of a tubular cloth submerged in a filtrate tank, and a pump for making muddy water pass through this water passage, It is a device for concentrating muddy water, characterized in that the filtrate tank has a structure capable of being sealed, and a supply port for supplying a pressurized medium is provided in the filtrate tank. Here, for example, compressed air or high-pressure water can be used as the pressurizing medium. In this concentrating device, if a tubular cloth that is woven by alternately weaving a synthetic fiber thread into a warp thread and a wire or a rigid linear body and a synthetic fiber thread as a weft is used as the tubular cloth It is preferable because the cloth keeps its cross section circular and does not collapse. further,
The structure of this tubular fabric is such that inside a tubular body woven of warp threads and weft threads that is resistant to mud pressure, a densely woven tubular body is prepared by using multifilaments of synthetic fibers for the warp threads and weft threads. A tubular cloth having a fitted structure may be used.
When the muddy water pressure is low, the inner cylinder alone can be used.

Next, in the muddy water concentrating method of the present invention,
Provided is a method for concentrating muddy water, which comprises feeding air bubbles together with muddy water into a tubular cloth as a means for preventing the accumulation of solids. An apparatus for realizing this method is the above-mentioned muddy water concentrating apparatus, characterized in that an air blowing device is provided in the water passage on the outlet side of the pump. As the air blowing device, a nozzle for blowing compressed air may be provided in the water passage.

Next, another method is to immerse the muddy water in a water passage having a permeable wall by immersing it in the filtrate tank, to leach the filtrate from the permeable wall into the filtrate tank, and to make the muddy water in the water passage. In the method of concentrating muddy water for increasing the concentration of, the method for concentrating muddy water is characterized by applying vibration to a water passage or a filtrate. An apparatus for carrying out this method is the above-mentioned muddy water concentrating apparatus, which is equipped with a vibrator immersed in the filtrate in the filtrate tank. The vibrator may be attached to a tubular cloth to give vibration to the tubular cloth, or it may be immersed in the filtrate in the filtrate tank without contacting the tubular cloth to give vibration to fresh water. .

Another means of the present invention is to pass mud water through a water passage having a permeable wall and allow the filtrate to leach out of the water passage from the permeable wall to increase the concentration of the mud water in the passage. A method for concentrating muddy water, which comprises fluctuating the flow of muddy water. As a means for giving pulsation, a pulsation generator may be attached to the water passage,
A device for rapidly opening and closing the valve of the water passage provided on the outlet side of the pump may be attached.

Next, in the above-mentioned device for concentrating muddy water, as a device for further sedimenting and removing a small amount of mud contained in the filtrate leached from the tubular cloth, a space in which the filtrate rises at a low speed is provided in the filtrate tank. Provided is a mud concentrating device, characterized in that a filtrate is overflowed from an upper portion of a filtrate tank, an inclined plate is arranged in the space, and a mud discharge port is provided at a bottom portion of the filtrate tank.

[0012]

According to the present invention, the mud water is passed through the water passage having the permeable wall so that the filtrate can be leached out of the water passage through the permeable wall to increase the concentration of the mud water in the water passage, thereby reducing the water concentration to a relatively low level. The present invention relates to an improvement in the technique for concentrating concentrated mud water, and prevents solid substances from adhering to the inner surface of a tubular fabric and degrading the concentration performance. Specific means include applying external pressure from a pressure fluid to the tubular fabric to reversely permeate the filtrate to remove solid matter on the inner surface of the tubular fabric, blowing air bubbles into the tubular fabric and stirring it in muddy water. Means for preventing sticking of solids by applying a pressure, means for mechanically vibrating the tubular cloth to prevent sticking of solids, means for pulsating the flow in the tubular cloth, and the like.

Further, the apparatus of the present invention is provided with a pressurizing device, an air blowing device, a vibrator, and a pulsation generating device which realize the above means, thereby completely solving the problems such as clogging of the tubular cloth. As a pulsation generator, a device that suddenly opens and closes the valve at the muddy water inlet of the water passage can cause pressure fluctuations inside the tubular fabric, and due to a phenomenon similar to a water hammer, it adheres to the inner surface of the tubular fabric. Muddy soil is washed away.

On the other hand, a space in which the filtrate rises at a low speed is provided in the filtrate tank, the filtrate is overflowed from the upper part of the filtrate tank, and an inclined plate is arranged in this space, and fine solid particles are distributed along the inclined plate. Even if a small amount of fine mud is included in the filtrate, the mud is settled in the tank and the filtrate becomes clean water and is discharged to the outside of the tank. It

[0015]

1 is a plan view of an apparatus according to an embodiment of the present invention, FIG.
(B) The side view was shown. The pump 2 sucks muddy water through the pipe 5 and the valve 11, and continuously pumps the muddy water into the tubular cloth 22 in the filtrate tank 3 through the valve 12 and the pipe 7. The pressure-fed mud water is filtrated from the permeable wall of the tubular cloth 22 into the filtrate tank 3, and the mud water itself is concentrated and returned to the mud water tank via the pipe 4 or sent to the next step. The filtrate overflows from the filtrate tank 3. During normal operation of concentrating muddy water, valves 11 and 12
Is open and valves 13 and 14 are closed.

A tubular cloth 22 is housed in the filtrate tank 3 in a multiple spiral shape. A mesh cylinder 23 having a lattice-shaped wall is provided inside the outer wall 21 of the filtrate tank, and the tubular cloth 22 is prevented from adhering to the wall of the filtrate tank and reducing the filter cloth area. There is. The fine particles that have passed through the wall of the tubular cloth 22 settle and accumulate in the hopper-shaped conical cylinder 9 below the filtrate tank 3. The accumulated fine particles are re-concentrated by the pump 2 or stored. When reconcentrating, the valves 11 and 14 are closed and the valves 12 and 13 are opened.
When storing mud, close valves 11 and 12, valve 13,
Open with 14. [Example-1] In the above-mentioned apparatus, as the tubular cloth 22, 424 yarns in which four polyester spun yarns having a warp yarn count of 20 are conventionally used are used.
A cylindrical body having a diameter of 25 mm, which was plain-woven, was used by using a yarn in which four polyester long fiber yarns of 00d were twisted (30 yarns per 10 cm of the number of threads).

As an embodiment of the present invention, a tubular fabric is used in which a synthetic fiber yarn is woven by alternately weaving a wire or a rigid linear body and a synthetic fiber yarn into a warp yarn as a weft yarn. Specifically, it is as follows. (1) FIG. 2 illustrates the woven structure of the tubular cloth of the example.
2A is a plan view and FIG. 2B is a side view. Figure 2
In the above, as the warp yarn 61, 424 yarns in which four 20th count polyester spun yarns are twisted together are used, and as the weft yarns 63, four yarns of 1500 denier (d) polyester long fibers are twisted (per 10 cm of driving number). 26
97) as a linear body 62 which is a weft thread.
50d nylon monofilament
26 pieces were used. Then, as shown in FIG. 2, the warp yarn 61 (61a, 61b), the weft yarn 63, and the linear body 62 were woven in a plain weave. It is a tubular cloth made of a cylindrical body having a diameter of 25 mm woven in this way.

(2) FIG. 3 illustrates the woven structure of the tubular cloth of the embodiment. 3A is a plan view and FIG. 3B is a side view. As the warp yarn 61, 424 yarns in which four 20th count polyester spun yarns are put together are used.
The number of yarns obtained by twisting four polyester filaments of 1500 denier (d) as 3 (28 per 10 cm of the number of driving)
3) and a steel wire having a diameter of 1.5 mm (28 wires per 10 cm of the number of threads) as the linear body 64 and the warp thread 61, the weft thread 63, and the linear body 64, as shown in FIG.
Weaved in a half twill weave. It is a tubular cloth formed by forming the cloth having such a structure into a cylindrical body having a diameter of 25 mm.

(3) In another embodiment, the warp yarn 61 is made of polyester filament 1100d / 2 × 2 × 104.
Using a book, weft 63 polyester fiber 1100d /
5 × 27 filaments / 10 cm, linear filaments of nylon filament 9750 d × 27 filaments / 10 cm were woven into a tubular body, and a polyester multifilament with a diameter of 40 μm was used for warp and weft threads.
It is a cylindrical body having a tubular body structure which is woven by using 00 pieces.

A muddy water dehydration test was conducted under the following conditions. Mud conditions Mud: Micro Sand-D (Particle size of 74 with powder composed mainly of silica with inorganic components added to eliminate material separation)
Commercially available material of μm or less) Specific gravity: 1.06 Flow rate: 60 liters / min Mud pressure: 0.8 kg / cm ² Cylindrical fabric A: Warp yarn: A yarn formed by combining four polyester spun yarns of 20 count (20 / 4) 424. Weft yarn: A yarn in which four polyester filaments of 1500 denier are combined (28 yarns per 10 cm).

Cylindrical fabric B: Warp yarn: 20/6 × 2 × 129 yarns. Weft: 1500d
/ 1 x 60 pieces. 10 m of each of the tubular fabrics A and B having a diameter of 25 mmφ was immersed in water to pass mud water for 2 hours. The dehydration amount per minute gradually decreased to 5.4 to 2.1 liters / min, but the tubular fabric B had a 10 to 20% more dehydration amount than the tubular fabric A. After 2 hours, a water pressure of 0.5 kg / cm ² was applied to the outside of the tubular fabric for 10 minutes, and the test was conducted again.
The dehydration capacity was restored to about 90% of the initial capacity.

When the monofilament net-shaped tubular cloth was tested under the above-mentioned muddy water conditions, as shown in Table 1, the filtrate was dehydrated through the tubular cloth up to the opening of 86 μm. At 114 μm or more, total water leakage occurred from the tubular cloth. This is about 74 microns
Since it is less than μm, it is thought to be due to passing through the opening.

[0023]

[Table 1]

[Embodiment 2] The apparatus of the embodiment is a filtrate tank 3
A sealing lid 31 is provided on the filter tank 3 so that the filtrate tank 3 can be sealed, and a pressure medium can be supplied into the filtrate tank 3 for pressurization. When the muddy water is pumped and circulated in the tubular cloth, the mud adheres to the inner surface of the tubular cloth with the passage of time and the amount of dehydration decreases. At this time, the operation of the pump 2 is temporarily stopped to stop the passage of muddy water, the valve 35 provided in the filtrate overflow pipes 34, 36 is closed, the valve 33 of the pressurized medium introduction pipe 32 is opened, and the tank is closed. Apply pressure to the water inside for a certain period of time. As the pressurizing medium, compressed air, pressurized water or the like can be used.

The water in the filtrate tank 3 flows through the wall of the tubular cloth 22.
It penetrates through and penetrates the inside and adheres to the inner wall of the tubular fabric 22.
The solid content is removed, and the water in the tubular fabric passes through the pipe 4.
It is discharged to a muddy water tank (not shown). Then pressurizing medium
Close the valve 33 of the inlet pipe 32, open the valve 35,
Then, the pump 2 is restarted. 20th as warp thread
Align 2 polyester yarns from 6 yarns
Using 324 of the obtained threads, weft of 1000d
Filament shape made by combining four polyester filaments
Cylindrical cloth (Ashimori Industry Co., Ltd.) using 50 pieces per several 10 cm
A one hose manufactured by Co., Ltd.), diameter 65mmφ, long
Conducted by spirally burying 10m in the filtrate tank
Using the example equipment, drilling water with a specific gravity of raw mud water of 1.1
Concentrated. Mud flow rate is 135 liters / min, mud pressure
Force 1.3-1.4kg / cm² Concentrated in. At this time the filtrate
Is 8 liters / min, dehydration efficiency (vs total filtrate) about 6%
Remained the same. The turbidity of the filtrate is 20-40 mg / for about 1 hour.
It was 1, but then became 1-2 mg / l. About 30
After a lapse of time, the amount of filtrate gradually decreases, and after about 50 hours
To 5 liters / min. So the pump
Temporarily stop, attach the lid to the filtrate tank, and
Pressure of 2 kg / cm ² Was injected for 2 hours. That
After that, the pump was operated again to circulate and concentrate the muddy water. Filtrate
The volume was restored to 7 liters / min. Example 3 As shown in FIG. 1, the discharge pipe 7 of the pump 2
Attach the air blowing pipe 41 to the and blow air bubbles into the muddy water.
I tried to put it in. Using the same device as in Example-2,
The drilling water with a specific gravity of muddy water of 1.1 was concentrated. Mud flow
The amount is 155 liters / min, the muddy water pressure is 1.35 to 1.
4 kg / cm² 2kg / cm while concentrating with² The air
Was injected. At this time, the filtrate is 8.5-11 liters / m
in, dehydration efficiency (relative to total filtrate) remained at about 5.3-7.3%
did. The amount of filtrate varies greatly and the turbidity of the filtrate is
It was high at 140 mg / l for the first time, but after about 1 hour, 35
-40 mg / l. After about 20 hours, the amount of filtrate
Since it has dropped to 4 liters / min
Stopped rolling. Blowing air bubbles causes the turbidity of the filtrate to be slightly high.
However, the effect of increasing the throughput is remarkable. [Embodiment 4] FIG. 4 shows another embodiment.
A vibrator 51 is mounted in the link 3. Ba
The evaporator 51 has the following specifications.

Type: Rod-shaped electric vibrator Outer diameter 32 mmφ × Length 488 mm Vibration: Vibration frequency 12,000 to 14,000 v. p. m,
Maximum amplitude 1.8 mm Output: 280 W Voltage: 100 V Current: 5 A Weight: 4.9 kg Concentrating under the same conditions as in Example-2 and operating for 2 hours, the decrease in the amount of filtrate was improved by 20 to 30%. . [Embodiment 5] FIG. 5 shows an embodiment in which a filtrate raising space 70 is separately provided on the outer periphery of the filtrate tank 3, and an inclined plate 71 is provided in this raising space. The filtrate rises in the rising space 70 at an extremely slow rising speed and overflows.
At this time, the solid fine particles mixed in the filtrate spontaneously settle, and due to the action of the inclined plate, they efficiently settle along the surface of the inclined plate. The settled fine particles are collected in the hopper 72 and discharged from there.

[0027]

EFFECTS OF THE INVENTION According to the present invention, muddy water is passed through a water passage made of a tubular cloth having a permeable wall, and the filtrate is leached from the permeable wall to the outside of the water passage, so that the muddy water in the passage is leached. In the method of concentrating the muddy water for increasing the concentration, it is possible to effectively prevent the solid content from adhering to the inner surface of the tubular cloth and lowering the filtrate discharge capacity. As one of the methods for preventing this, a function can be restored by providing a pressurizing step in which the outer surface side of the tubular cloth is made higher than the inner surface side, but in this pressurizing step, the tubular cloth of the present invention is By using it, it is possible to effectively prevent the tubular cloth from being crushed.

The inner surface of the tubular cloth can be obtained by employing means for blowing air bubbles into the tubular cloth, means for mechanically vibrating the tubular cloth, means for pulsating the flow in the tubular cloth, and the like. It is possible to prevent the solid content from adhering to.

[Brief description of drawings]

FIG. 1A is a plan view and FIG. 1B is a side view of an apparatus according to an embodiment.

FIG. 2 is an explanatory view showing the woven structure of the tubular cloth of the example.

FIG. 3 is an explanatory view showing the woven structure of the tubular cloth of the example.

FIG. 4A is a plan view and FIG. 4B is a side view of the apparatus according to the embodiment.

5 (a) is a plan view and FIG. 5 (b) is a side view of the embodiment apparatus.

[Explanation of symbols]

1 Muddy water tank 2 Pump 3 Filtrate tank 4, 5, 6, 7,
8 pipes 11, 12, 13, 14 valve 21 outer wall 22 tubular cloth 23 mesh cylinder 24 cylindrical helical maintenance member 25 bellows pipe 31 lid 32 pressurized medium introduction pipe 33 valve 34, 36 overflow pipe 35 valve 41 air pipe 42 Valve 51 Vibrator 61 Warp thread 62 Linear body 63 Weft thread 64 Linear body 70 Ascending space 71 Inclined plate 72 Hopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Uegaki 7-11-7 Senrioka, Settsu-shi, Osaka Ashimori Engineering Co., Ltd. (72) Inventor Masahiro Seshita 7-11-7 Senri-oka, Settsu-shi, Osaka Ashi Mori Engineering Co., Ltd.

Claims (10)

[Claims] 1. Concentration of muddy water for increasing the concentration of muddy water in the passage by allowing muddy water to pass through the water passage made of a tubular fabric having a permeable wall and allowing the filtrate to leach out of the water passage from the permeable wall. A method for concentrating muddy water, which comprises a step of increasing the pressure on the outer surface side of the tubular cloth from the inner surface side. 2. In a muddy water concentrating device comprising a water passage made of a tubular cloth submerged in a filtrate tank and a pump for letting muddy water pass through the water passage, the filtrate tank can be sealed and the filtrate can be sealed. A muddy water concentrating device having a supply port for supplying a pressurized medium in a tank. 3. The tubular fabric is a tubular fabric formed by weaving synthetic fiber yarns into warp yarns by alternately weaving wire or rigid linear bodies and synthetic fiber yarns as weft yarns. The described muddy water concentrator. 4. A structure in which a tubular cloth is tightly woven by using a synthetic fiber multifilament in the warp threads and the weft threads inside a tubular body in which pressure-resistant warp threads and weft threads are woven. A tubular cloth, wherein the cloth is a tubular cloth.
The described muddy water concentrator. 5. A method for concentrating muddy water in which mud is passed through a water passage having a permeable wall, and filtrate is leached from the permeable wall to the outside of the water passage to increase the concentration of the muddy water in the passage. A method for concentrating muddy water, which comprises feeding air bubbles into a water passage. 6. A muddy water concentrating device comprising a water passage made of a tubular cloth submerged in a filtrate tank and having a permeable wall, and a pump for letting muddy water pass through the water passage. A mud concentrating device having an air blowing device in a waterway. 7. A muddy water which is immersed in a filtrate tank to pass mud water through a water passage having a permeable wall, from which the filtrate is leached into the filtrate tank to increase the concentration of the muddy water in the water passage. In the method for concentrating muddy water, vibration is applied to a water passage or a filtrate, and 8. A muddy water concentrating device comprising a water passage made of a tubular cloth submerged in a filtrate tank and a pump for letting the muddy water pass through the water passage, comprising a vibrator immersed in the filtrate in the filtrate tank. A muddy water concentrator that is characterized by 9. A method for concentrating muddy water in which muddy water is passed through a water passage having a permeable wall and filtrate is leached from the permeable wall to the outside of the water passage to increase the concentration of the muddy water in the passage. A method for concentrating muddy water, characterized by pulsating the flow. 10. An apparatus for submerging a tubular cloth-made water passage in a filtrate tank to pass muddy water into the water passage, leaching the filtrate into the filtrate tank and concentrating the muddy water into the filtrate tank. A muddy water concentrating device characterized by providing a space in which the filtrate rises at a low speed, overflowing the filtrate from the upper part of the filtrate tank, and arranging an inclined plate in the space, and providing a sludge discharge port at the bottom of the filtrate tank. .