JP3232849U - Liquid treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid treatment apparatus capable of reducing the amount of waste of a high specific density liquid. A liquid treatment apparatus is arranged at a treatment tank 17 and a bottom of the treatment tank 17, and is connected to a treatment tank 17 at the bottom of a generator 25 that mixes a gas into the treatment liquid to generate fine bubbles. Separation tank 15, a clean tank 19 connected to the treatment tank 17 at the bottom, and a pump 35 having a suction port 33 that opens above the liquid level of the treatment tank 17 and a discharge port 37 that discharges to the separation tank 15. It is provided with a discharge port 21 arranged in the upper part of the tank 15 for discharging the low-density liquid and suspended matter, and a collection port 23 arranged in the upper part of the clean tank 19 for collecting the high-density liquid. [Selection diagram] Fig. 1

Description

The present invention relates to a liquid treatment apparatus.

The tank, the micro-bubble generator installed in the tank, the supply device that supplies the waste liquid existing outside and / or the liquid in the tank to the micro-bubble generator, and air to the micro-bubble generator. The micro-bubble generator is a swirl shear type micro-bubble generator, and the micro-bubbles emitted from the micro-bubble generator near the outlet of the micro-bubble generator. An emulsion demulsifying device has been proposed in which an emulsion in a liquid is emulsified, separated into at least two types of liquids having no affinity for each other, and one liquid is levitated together with the microbubbles (see Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2015-155092

When the oil-water separation tank of Patent Document 1 is applied to a cleaning liquid of a washing machine or a coolant of a machine tool, the amount of liquid B (high specific density liquid) contained in the floating liquid A (low specific density liquid) may be large. .. In this case, the cleaning liquid and coolant, which are high-density liquids with high utility value, are discarded together with the low-density liquid to be removed.
An object of the present invention is to provide a liquid treatment apparatus capable of reducing the amount of waste of a high-density liquid.

The present invention is a liquid treatment apparatus.
With the processing tank
A fine bubble generator that is placed at the bottom of the treatment tank and mixes gas into the treatment liquid to generate fine bubbles.
A separation tank connected to the treatment tank at the bottom,
A clean tank connected to the treatment tank at the bottom,
A pump having a suction port that opens above the liquid level of the treatment tank and a discharge port that discharges to the separation tank.
An outlet that is located above the separation tank and discharges low-density liquids and suspended matter, and
A collection port located at the top of the clean tank where high-density liquid is collected,
It has.

The liquid treatment apparatus of the present invention is applied to a storage tank having a pump and storing the treatment liquid. The storage tank is, for example, a coolant tank for a machine tool or a cleaning liquid tank for a washing machine. As the treatment liquid, for example, an aqueous solution is used. The treatment liquid is, for example, an aqueous coolant for a machine tool or an aqueous cleaning liquid. The treatment liquid corresponds to a high specific density liquid. Oil, fine chips, etc., which are low specific density liquids, are suspended in the treatment liquid.
The fine bubbles generated in the treatment liquid by the fine bubble generator are adsorbed on the suspended matter or the like that becomes turbid in the treatment liquid and floated. Floating matter, oil, etc. floating with air bubbles are sucked up from the suction port by a pump, and the air bubbles disappear at the time of suction and are discharged to the separation tank. The high-density liquid, the low-density liquid and the suspended matter are separated in the separation tank. The separated suspended matter is discharged from the discharge port.
The high density liquid returns to the inside of the treatment tank and moves from the bottom of the treatment tank to the clean tank. The purified treatment liquid returns from the collection port to the storage tank.

According to the present invention, it is possible to provide a liquid treatment apparatus capable of reducing the amount of waste of a high specific density liquid.

Configuration diagram of the liquid treatment device of the first embodiment Perspective view of the liquid treatment apparatus of the first embodiment Top view of the treatment tank of the first embodiment FIG. 3 is a sectional view taken along line IV-IV. Enlarged view of V part in FIG. VI-VI line sectional view of FIG. Flowchart of liquid treatment method Graph showing the amount of impurities with respect to the processing time of the example Configuration diagram of the liquid treatment device of the second embodiment Top view of the separation tank, levitation tank and clean tank of the second embodiment Perspective view of the suction port of the second embodiment

(First Embodiment)
FIG. 1 shows the liquid treatment apparatus 10 of the present embodiment. The liquid treatment device 10 includes a separation tank 15, a treatment tank 17, a clean tank 19, a fine bubble generator (hereinafter referred to as “generator 25”), and a pump 35. The liquid treatment device 10 may include a drain tank 39 and a pump 13.

The liquid treatment device 10 is applied to the storage tank 11 for storing the treatment liquid. The pump 13 pumps the treatment liquid from the storage tank 11 and sends it to the generator 25 via the treatment liquid injection pipe (hereinafter, referred to as “injection pipe 27”).

As shown in FIGS. 1 to 4, the separation tank 15, the treatment tank 17, and the clean tank 19 may be integrally formed in a single box-shaped tank. The separation tank 15, the treatment tank 17, and the clean tank 19 have a common inclined bottom plate 14. The bottom plate 14 is the lowest at the right end and the highest at the left end in FIG. In a plan view, the separation tank 15 is arranged at one corner of a rectangle (the right-hand corner of FIG. 3). In a plan view, the cleaning tank 19 is arranged along one side (left side in FIG. 3) of a rectangle separated from the separation tank 15. The remaining portion of the central portion is the treatment tank 17.

The clean tank 19 is connected to the treatment tank 17 via a clean tank connection port (hereinafter, referred to as “connection port 20”). The clean tank 19 has a collection port 23.
The collection port 23 is arranged in the upper part of the clean tank 19. The installation height of the collection port 23 determines the height of the liquid level 22 of the cleaning tank 19 and the processing tank 17 (hereinafter, also referred to as “liquid level height”). The liquid level 22 of the clean tank 19 is located above the liquid level 12 of the storage tank 11. The collection port 23 is connected to the storage tank 11.

The separation tank 15 is connected to the treatment tank 17 at the bottom. The discharge port 21 is arranged above the separation tank 15. The discharge port 21 has a fixing portion 21a and an adjusting portion 21b. The fixing portion 21a rises vertically from the bottom plate 14 of the separation tank 15. The fixed portion 21a is a round pipe. A male screw 21c is arranged at the upper end of the fixing portion 21a. The adjusting unit 21b is a round pipe. Inside the adjusting portion 21b, a female screw 21d that meshes with the male screw 21c is arranged. The adjusting portion 21b is screwed into the fixing portion 21a. When the adjusting unit 21b is rotated, the adjusting unit 21b moves up and down. Floating matter and low-density liquid (for example, oil) are discharged from the upper surface of the adjusting portion 21b. The discharge is collected in the drain tank 39. The height of the upper end of the adjusting portion 21b is adjusted to be slightly higher than the liquid level height.
The structures of the discharge port 21 and the recovery port 23 may be interchanged with each other. That is, the collection port 23 includes a fixing portion rising from the bottom plate and an adjusting portion that can be adjusted by a screw, and the discharge port 21 may be fixed above the side surface of the separation tank 15.

A drain port 41 may be arranged on the bottom plate 14 of the separation tank 15. The drain port 41 is arranged at the deepest part of the bottom plate 14. A valve 43 is arranged at the drain port 41. The valve 43 is always closed. The drain port 41 is connected to the drain tank 39 via the valve 43. The treatment liquid and bubbles discharged into the separation tank 15 are separated into a low specific density liquid and a high specific density liquid inside the separation tank 15. Further, the foreign matter to which fine bubbles are attached and floated together with the bubbles settles inside the separation tank 15. The settled foreign matter moves to the deepest part along the inclined bottom plate 14, and is eventually collected in the drain tank 39. Foreign matter accumulated in the separation tank 15 when the valve 43 is opened can be discharged.

The processing tank 17 has a rectangular shape in the plan view. The treatment tank 17 may include an aeration tank 17a and a bubble floating tank (hereinafter, referred to as “floating tank 17b”).
At this time, the aeration tank 17a is arranged in the deep part of the treatment tank 17, and the levitation tank 17b is arranged in the shallow part. The generator 25 is arranged in the aeration tank 17a. The aeration tank 17a and the levitation tank 17b are connected by a communication port 17c (inflow port). That is, the communication port 17c is arranged at one end of the floating tank 17b. The communication port 17c is provided so as to open from above the liquid level 22 to the bottom plate 14. That is, in the communication port 17c, there is no wall that separates the aeration tank 17a and the levitation tank 17b.

The aeration tank 17a has a communication port 17c in a shallow portion thereof and a separation tank connection port (hereinafter, referred to as “connection port 16”) in a deep portion thereof. The connection port 16 connects the aeration tank 17a to the separation tank 15. The connection port 16 is arranged at the bottom. Preferably, the connection port 16 is arranged in the deepest part of the aeration tank 17a.
Preferably, the connection port 16 and the communication port 17c are arranged diagonally of the aeration tank 17a in a plan view.

In the levitation tank 17b, an elongated passage 17d having a U-shaped cross section is formed below the liquid level 22. The passage 17d is folded back in a meandering shape to be compactly configured. For example, in a plan view, the levitation tank 17b has a rectangular shape as a whole, and a plurality of partition plates 18 arranged in parallel are arranged. The partition plate 18 partitions from slightly below the liquid level 22 to the bottom plate 14 in the height direction. In a plan view, the partition plate 18 extends from one side surface to the vicinity of the other side surface and has an opening 18a on the other side. The openings 18a are arranged at the ends of both side surfaces that alternate with respect to the adjacent partition plates 18. The connection port 20 (outlet) is provided at the bottom of the other end (left end in FIG. 3) of the processing tank 17 (floating tank 17b).
Since the partition plate 18 is below the liquid level 22, air bubbles floating in the aeration tank 17a and the floating tank 17b can be quickly moved to the suction port 33.

The pump 35 has a suction port 33 and a discharge port 37. The pump 35 generates a negative pressure, sucks it, and discharges it from the discharge port 37. As the pump 35, for example, an ejector pump, a diaphragm pump, and a rotary pump can be used.

As shown in FIGS. 3 and 4, the suction port 33 is provided at the other end of the processing tank 17 (the left end of FIG. 3). The suction port 33 may be a round tube or a square tube. The suction port 33 opens above the liquid level 22. Preferably, a part of the suction port 33 opens below the liquid level 22 of the treatment tank 17. The suction port 33 is arranged so as to be inclined by an angle θ with respect to the liquid surface. The angle θ is preferably 30 degrees or more and 50 degrees or less. When the angle θ exceeds 50 degrees, the sucked treatment liquid tends to flow back to the suction port 33. If the angle θ is less than 30 degrees, the installation area will increase.
Since a part of the suction port 33 is opened below the liquid level 22, the pump 35 sucks in the treatment liquid, and bubbles floating in the treatment liquid move toward the suction port 33 together with the treatment liquid. Floating matter and low-density liquid (for example, oil) are adsorbed on the bubbles. Since the air bubbles move toward the suction port 33, the air bubbles are sucked up one after another by the suction port 33.

The discharge port 37 is arranged in the separation tank 15. The discharge port 37 opens below the liquid level 22 of the separation tank 15.

As the generator 25, a known generator can be used. As the generator 25, an air shear type can be used. Desirably, the generator 25 produces bubbles of 20 to 50 μm.
The generator 25 is arranged at one end of the processing tank 17. The generator 25 is arranged at the bottom of the processing tank 17. The generator 25 is arranged from the liquid level 22 of the treatment tank 17 to a depth of, for example, 3/4 to 4/5 of the tank depth. Preferably, the generator 25 is arranged so that a space is created below the generator 25. The generator 25 is arranged far from the communication port 17c in a plan view.

As shown in FIGS. 5 and 6, the generator 25 has a body 25a, an air inflow hole 25b, a bubble generation port 25c, and a liquid inflow port 25d. The body 25a has a drum shape in which the end of the round tube is sealed with a plate. The air inflow hole 25b and the bubble generation port 25c are arranged at the center of both end faces of the body 25a. The air inflow hole 25b is a round hole. The bubble generation port 25c is a round hole. The liquid inflow port 25d is arranged closer to the air inflow hole 25b than the center of the length of the body 25a. In the cross section, the liquid inflow port 25d opens in the tangential direction of the inner peripheral surface of the body 25a. The liquid inlet 25d is connected to the injection pipe 27.
One end of the air guide tube 29 is connected to the air inflow hole 25b. The other end of the air guide tube 29 opens above the liquid level 22.

A part of the treatment liquid may be supplied to the treatment tank 17 from the treatment liquid supply port 31. The processing liquid supply port 31 is connected to the pump 13. The flow rate of the treatment liquid passing through the generator 25 is determined according to the dimensions of the generator 25 and the pressure of the treatment liquid. By providing the processing liquid supply port 31 that does not pass through the generator 25, it is possible to process a treatment liquid in an amount larger than the flow rate that passes through the generator 25.

The liquid treatment method will be described with reference to FIG. 7. The pump 13 sends the processing liquid to the processing tank 17. The treatment liquid is supplied from the treatment liquid supply port 31 and the generator 25 (S1).

The swirling flow of the processing liquid sent from the injection pipe 27 creates a negative pressure inside the generator 25. As a result, the generator 25 sucks air from the air guide tube 29 through the air inflow hole 25b. The swirling flow of the treatment liquid shears the air and ejects it as fine bubbles from the bubble generation port 25c (S2).

The diameter of the fine bubbles is preferably 20 to 50 μm. The fine bubbles are well mixed with the treatment liquid in the aeration tank 17a. The fine bubbles adhere to suspended matter in the treatment liquid and oil droplets dispersed in the treatment liquid. The treatment liquid flows from one end to the other end of the treatment tank 17. During this time, the fine bubbles float together with oil droplets and suspended matter. When the passage 17d is arranged in the treatment tank 17, the treatment liquid flows along the passage 17d, so that the treatment liquid travels a long distance. By the time the treatment liquid reaches the end of the levitation tank 17b, the fine bubbles completely float (S3).

The pump 35 sucks air bubbles adhering to suspended matter or oil droplets and floating from the suction port 33 together with the treatment liquid. Since the pump 35 sucks air bubbles together with the treatment liquid, the air bubbles floating at a position far from the suction port 33 also move to the vicinity of the suction port 33 and are quickly sucked. Even when the passage 17d is arranged, since the partition plate 18 is below the liquid level 22, the floating air bubbles can easily move to the vicinity of the suction port 33. At the time of suction, the pressure is reduced and the bubbles disappear. The treatment liquid in which the bubbles have disappeared is sent from the discharge port 37 to the separation tank 15 (S4).

The treatment liquid sent to the separation tank 15 contains suspended matter, a low specific density liquid and a high specific density liquid. The low specific density liquid has large droplets in the process of steps S1 to S4. The grown droplets rise quickly inside the separation tank 15. The floating material and the low specific density liquid sent to the separation tank 15 are separated into the high specific density liquid and the two phases. Floating matter and low density liquid float above the high density liquid. As a result, the treatment liquid is separated into two liquids (S5).

The low-density liquid and suspended matter floating inside the separation tank 15 are discharged from the discharge port 21 (S6).

The high-density liquid that has sunk below the separation tank 15 returns to the processing tank 17 through the connection port 16 at the bottom (S7). The high-density liquid returned to the treatment tank 17 is processed by repeating steps S1 to S6.

The high-density liquid that comes into contact with the fine bubbles and is purified by the adsorption and levitation of the fine bubbles moves from the connection port 20 to the cleaning tank 19 (S8). The clean tank 19 is filled with a high density liquid.

Sediments such as foreign substances settle inside the separation tank 15 and the clean tank 19 (S9). The sediment moves to the drain port 41 along the bottom plate 14 and is discharged from the drain port 41 (S10).

The treated high-density liquid is recovered from the recovery port 23 (S11). The recovered high-density liquid returns to the storage tank 11.

As described above, according to the present embodiment, it is possible to prevent the high-density liquid having high utility value from being discarded together with the low-density liquid to be removed. That is, it is possible to provide a liquid treatment apparatus capable of reducing the amount of waste of a high specific density liquid.

(Example)
FIG. 8 shows the amount of impurities such as oil content with respect to the treatment time. Here, as the treatment liquid, an aqueous cleaning liquid (a 2% diluted aqueous solution of Yushiro Cleaner W185 manufactured by Yushiro Chemical Industry Co., Ltd.) was used. Iron powder and oil are mixed in the treatment liquid. The diameter of the fine bubbles was 20 to 30 μm as a result of observation with a microscope. The capacity of the treatment tank 17 was 20 L. 100 mL of the treatment liquid was collected from the treatment tank 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes, and 15 minutes after the start of generation of fine bubbles in the treatment tank 17. The treatment liquid collected with a 20 μm filter (a nylon net filter manufactured by Merck Co., Ltd.) whose dry mass was measured in advance was filtered. The filter after filtration is dried and the mass after filtration is measured. The difference between the mass of the filter after filtration and the dry mass of the filter before filtration was taken as the amount of impurities. The amount of impurities with respect to the elapsed time was plotted.
According to FIG. 8, the amount of impurities decreases exponentially with respect to the processing time. About 60% of the processing time is removed in 1 minute. About 75% of the processing time is removed in 2 minutes. The processing time is 3 minutes and 80-85% is removed. Almost no change was observed after 5 minutes of treatment time, and it was 86 to 93% even after 10 minutes. From FIG. 8, the treatment time is preferably 1 minute to 3 minutes, more preferably 2 minutes to 3 minutes.

The treatment time in FIG. 8 corresponds to the residence time of the treatment liquid inside the treatment tank 17 when the treatment liquid continuously flows into the treatment tank 17. Therefore, the residence time of the treatment liquid in the treatment tank 17 is preferably 1 minute to 3 minutes, and particularly preferably 2 minutes to 3 minutes (including all ends). The residence time is obtained as a quotient obtained by dividing the volume (L) of the treatment tank 17 by the flow rate (L / min) of the treatment liquid flowing into the treatment tank 17.

(Second Embodiment)
9 to 11 show the liquid treatment apparatus 110 of the present embodiment. In the liquid treatment apparatus 110, the treatment tank 17 is separated into an aeration tank 117a installed above and a floating tank 117b installed below. The levitation tank 117b is connected to the separation tank 15 by a separation tank connection port (hereinafter, referred to as “connection port 116”). The levitation tank 117b is connected to the clean tank 119 by a clean tank connection port (hereinafter, referred to as “connection port 120”).

A generator 25 is arranged in the aeration tank 117a. The aeration tank 117a has an overflow port 117g. The installation height of the overflow port 117g determines the height of the liquid level 122a of the aeration tank 117a. The overflow port 117g and the floating tank 117b are connected by an overflow passage 117c. The overflow passage 117c connects the overflow port 117g and one end of the floating tank 117b. The opening of the overflow passage 117c on the opposite side of the overflow port 117g corresponds to an inflow port arranged at one end of the floating tank 117b and connected to the aeration tank 117a.

As shown in FIG. 9, the separation tank 15, the floating tank 117b, and the cleaning tank 119 are integrally formed in the box-shaped lower tank 151. In a plan view, the separation tank 15 is formed at a rectangular corner of the lower tank 151. In a plan view, the cleaning tank 119 is arranged on one side of a rectangle in which the separation tank 15 is not arranged.

The levitation tank 117b may include an elongated passage 17d having a U-shaped cross section below the liquid level 122b. The connection port 116 is arranged at the bottom of one end of the levitation tank 117b. The connection port 116 is connected to the separation tank 15. A connection port 120 (outlet) is arranged at the other end. The connection port 120 is connected to the clean tank 119.

The suction port 133 is arranged at the other end of the levitation tank 117b. As shown in FIG. 11, the suction port 133 forms a slit extending along the liquid level 122b. In the height direction, a part of the suction port 133 is submerged below the liquid level 122b. Since the suction port 133 is a slit, air bubbles that have emerged from a wide range can be sucked.

The cleaning tank 119 may include a lower partition plate 119a and an upper partition plate 119b. In a plan view, the lower partition plate 119a and the upper partition plate 119b are arranged in parallel. The lower partition plate 119a is closer to the connection port 120 than the upper partition plate 119b. The lower partition plate 119a partitions from the central portion of the tank depth to the bottom of the tank. That is, the lower partition plate 119a partitions from the bottom plate 14 to the vicinity of the liquid level 122b. The lower partition plate 119a does not partition the liquid level 122b. The upper partition plate 119b partitions from above the liquid level 122b to the central portion of the tank depth. The high-density liquid flowing into the cleaning tank 119 is blocked by the lower partition plate 119a, flows from the vicinity of the liquid level 122b toward the upper partition plate 119b, and flows into the collection port 23 from below the upper partition plate 119b.
In the cleaning tank 119, the high specific density liquid flows out from the recovery port 23 beyond the lower partition plate 119a and the upper partition plate 119b, so that the foreign matter having a high specific density in the high specific density liquid sinks downward and flows out from the recovery port 23. The amount of foreign matter in the high density liquid is reduced.

The drain port 41 is connected to a drain capsule (hereinafter, simply "capsule 45") via a valve 43. The capsule 45 is a closed container having a connection port connected to the valve 43. The capsule 45 can be removed from the valve 43. For example, the capsule 45 is connected to the valve 43 via a flange joint, a union joint, or a ferrule joint. The valve 43 is always open. The sediment falls into the capsule 45 through the drain port 41 and the valve 43. When the valve 43 is closed, the capsule 45 can be removed and the foreign matter accumulated in the capsule 45 can be collected. For example, metals such as fine chips can be recovered.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the configuration described in the embodiment. The present invention can appropriately change the configuration within a range that does not deviate from the gist, including appropriately combining or selecting the configurations described in the above-described embodiment.

10,110 Liquid treatment equipment 15 Separation tank 17 Treatment tank 17a, 117a Aeration tank 17b, 117b Floating tank 17c Communication port (inlet)
17d passage 19,119 clean tank 20,120 connection port (outlet)
21 Discharge port 23 Recovery port 25 Generator (fine bubble generator)
31 Treatment liquid supply port 33, 133 Suction port 35 Pump 37 Discharge port 41 Drain port 43 Valve 45 Capsule (drain capsule)
117g Overflow port 117c Overflow passage

Claims (9)

With the processing tank
A fine bubble generator that is placed at the bottom of the treatment tank and mixes gas into the treatment liquid to generate fine bubbles.
A separation tank connected to the treatment tank at the bottom,
A clean tank connected to the treatment tank at the bottom,
A pump having a suction port that opens above the liquid level of the treatment tank and a discharge port that discharges to the separation tank.
An outlet that is located above the separation tank and discharges low-density liquids and suspended matter, and
A collection port located at the top of the clean tank where high-density liquid is collected,
A liquid treatment device comprising. A part of the suction port opens below the liquid level of the treatment tank.
The liquid treatment apparatus according to claim 1. The opening direction of the suction port is inclined with respect to the liquid level of the treatment tank.
The liquid treatment apparatus according to claim 1 or 2. The opening direction of the suction port and the liquid level of the treatment tank form an angle of 30 degrees or more and 50 degrees or less.
The liquid treatment apparatus according to claim 3. The treatment tank
The aeration tank in which the fine bubble generator is arranged and
It has one end where an inflow port connecting to the aeration tank is arranged, and the other end where an outflow port connecting to the cleaning tank and the suction port are arranged, and is provided below the liquid level of the treatment tank. It has a bubble levitation tank with an elongated passage with a U-shaped cross section.
The liquid treatment apparatus according to any one of claims 1 to 4. The aeration tank has an overflow port and is located above the bubble levitation tank.
Further provided with an overflow passage connecting the overflow port and one end of the bubble floating tank.
The separation tank is connected to the bubble floating tank at the bottom.
The liquid treatment apparatus according to claim 5. In addition
A treatment liquid supply port for supplying the treatment liquid to the treatment tank is provided.
The liquid treatment apparatus according to any one of claims 1 to 6. The clean tank has a partition plate that partitions from the central portion of the tank depth to the bottom of the tank.
The liquid treatment apparatus according to any one of claims 1 to 7. The drain port installed at the bottom of the separation tank and
A valve connected to the drain port and
A capsule that is detachably installed on the valve and is connected to the drain port via the valve.
The liquid treatment apparatus according to any one of claims 1 to 8, further comprising.

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