KR102405527B1 - Liquid treatment apparatus and liquid treatment method - Google Patents

Abstract

Provided are a liquid treatment device and a liquid treatment method for reducing the amount of waste of high specific gravity liquid.
The liquid treatment device 10 includes a liquid supply pump 15 for transferring the treatment liquid 13 stored in the tank 11 , the treatment liquid 13 flows in, and is disposed near the liquid level of the treatment liquid 13 , The bubble tank 23 having a floating material discharge port 23b for discharging the floating material floating on the treatment liquid 13 , and the treatment liquid disposed outside the bubble tank 23 and transferred from the liquid supply pump 15 . The treatment liquid overflowing from the liquid level of the microbubble generator 17 for generating microbubbles by mixing air in 13, the separation tank 29 connected from the bottom to the bubble tank 23, and the separation tank 29 and a circulation pipe (31) for returning (13) to the tank (11).

Description

Liquid treatment apparatus and liquid treatment method

The present invention relates to a liquid treatment apparatus and a liquid treatment method.

An emulsion demulsifier having a tank, a microbubble generator installed in the tank, a supply device for supplying a liquid to the microbubble generator, and a gas supply device for supplying a gas such as air to the microbubble generator has been proposed (Japanese Patent Application Laid-Open No. 2015-155092). In the conventional emulsion de-emulsification apparatus, the emulsion in the liquid is de-emulsified by the microbubbles emitted from the microbubble generator, separated into at least two liquids having no mutual affinity, and one liquid is floated together with the microbubbles.

In a conventional emulsion demulsifier, the high specific gravity solution is discarded together with the low specific gravity solution to be removed.

The present invention provides a liquid treatment apparatus and a liquid treatment method for reducing the amount of waste of a high specific gravity liquid.

The first aspect of the present invention is

A liquid supply pump that transports the treated liquid stored in the tank, and

As a bubble tank into which the treatment liquid flows,

a bubble tank disposed near the liquid level of the treatment liquid and having a floating material outlet for discharging the floating material floating on the treatment liquid;

A micro-bubble generator disposed outside the bubble tank, the micro-bubble generator generating micro-bubbles by mixing air into the treatment liquid transferred from the liquid supply pump;

a separation tank connected from the bottom to the bubble tank;

and a circulation pipe for returning the processing liquid overflowing from the liquid level of the separation tank to the tank.

The second aspect of the present invention is

Micro-bubbles of air are mixed from the outside of the bubble tank into the treatment liquid containing foreign substances and oil stored in the tank,

The treatment liquid mixed with the microbubbles is introduced into the bubble tank,

The microbubbles are attached to the foreign material and the oil and float in the bubble tank,

The treatment liquid flows into the separation tank from below the bubble tank,

circulating the treatment liquid from the separation tank to the tank;

It is a liquid treatment method for discharging the floating material above the liquid level of the bubble tank.

A bubble tank is a closed tank. The microbubble generator is installed outside the bubble tank. The microbubble generator is disposed in the path connecting the tank and the bubble tank. The lower end of the bubble outlet is separated from the liquid level of the treatment liquid. Preferably, the top of the bubble outlet is lower than the top plate. The space that extends above the liquid level of the bubble tank is called the bubble floating tank (浮上槽). The outlet is disposed in the bubble bath. The height of the outlet is in the vicinity of the liquid level. The height of the outlet may be higher than the liquid level. The defoaming pump is a pressure reducing pump. The coalescer is disposed below the liquid level of the treatment liquid.

The bubble generator is, for example, an air shear type. The bubble generator may be a swirl flow type micro bubble generator.

According to the liquid treatment apparatus and liquid treatment method of the present invention, the amount of waste of the high specific gravity liquid can be reduced.

1 is a liquid processing apparatus according to a first embodiment.
It is the perspective view which cut|disconnected a part of the processing tank of 1st Embodiment.
FIG. 3 is a cross-sectional view taken along a line III of FIG. 2 .
Fig. 4 is a flowchart showing the liquid treatment method according to the first embodiment.
5 is a liquid processing apparatus according to a second embodiment.
It is the perspective view which cut off a part of the processing tank of 2nd Embodiment.

(First embodiment)

As shown in FIG. 1 , the liquid processing apparatus 10 of the present embodiment includes a liquid supply pump 15 , a generator (fine bubble generator 17 ), and a treatment tank 22 . The liquid treatment apparatus 10 may have a check valve 19 , a throttle 21 , a discharge valve (floating object discharge valve, 47 ), a defoaming pump 45 , and a drain tank 49 .

The liquid treatment device 10 removes foreign substances and oil contained in the treatment liquid 13 stored in the tank 11 . The tank 11 is, for example, a tank of a machine tool or a washing machine. The treatment liquid 13 is, for example, an aqueous coolant or an aqueous cleaning liquid. The foreign matter is, for example, cut chips, fiber chips, or abrasive grains. Oils are, for example, oils and greases. Foreign matter and oil are turbid in the treatment liquid 13 .

As shown in FIG. 2 , the treatment tank 22 has a bubble tank 23 , a separation tank 29 , a circulation port 31a and a discharge port (floating object discharge port, 23b). The treatment tank 22 includes a top plate 36, a side wall 39, a lower partition plate 25, an upper partition plate 27, a circulation pipe 31, an external screw 31b, an inlet (second inlet, 23a), It may have a bubble outlet 41 , a recovery gutter 43 , a companion mouth 46 and a coalescer 26 .

The treatment tank 22 is a substantially rectangular parallelepiped, and has the bottom surface 22a. For example, the treatment tank 22 is provided above the tank 11 . The bottom surface 22a is shared by the bubble tank 23 and the separation tank 29 . The bottom surface 22a may be horizontal.

The separation tank 29 is disposed at one corner of the treatment tank 22 when viewed from above. The separation tank 29 is divided from the bubble tank 23 by an L-shaped partition wall 29a when viewed from above. The lower part of the separation wall 29a is opened, and the separation tank 29 and the bubble tank 23 are connected.

Plane III includes the centerline of the circulation tube 31 . As shown in FIG. 3 , the circulation pipe 31 is placed upright in the center of the separation tank 29 . The upper opening of the circulation pipe 31 becomes the circulation port 31a. The treatment liquid 13 flowing into the treatment tank 22 overflows into the circulation port 31a and returns to the tank 11 . The height of the liquid level 14 of the treatment liquid 13 is determined by the circulation port 31a.

The circulation pipe 31 may have a fixed pipe 31e, a male screw 31b, and an adjustment member 31c. The fixed tube 31e is placed upright from the bottom surface 22a. The male screw 31b is installed at the upper end of the fixing pipe 31e. The adjustment tool 31c has a female screw 31d on the inner surface. The adjusting tool 31c is screwed to the male screw 31b. The circulation pipe 31 is connected to the tank 11 . The liquid level adjuster 31c adjusts the height of the liquid level 14 in the separation tank 29 according to the amount of screw fastening.

As shown in FIG. 2 , the bubble tank 23 has side plates 23c and 23d , a top plate 36 , and a side wall 39 . The upper end of the side plate 23c may be higher than the top plate 36 . The upper end of the side plate 23c may be higher than the upper end of the partition wall 29a. The upper end of the side wall 39 is lower than the upper end of the side plate 23c. The side wall 39 separates the bubble tank 23 and the recovery gutter 43 . The top plate 36 may be horizontal. The height of the top plate 36 is definitely higher than the liquid level 14 . The bubble tank 23 is closed by the side plate 23c, the side wall 39, and the top plate 36. The bubble tank 23 has a floating chamber 33 which is a closed space above the liquid level 14 .

The bubble outlet 41 is disposed on top of the side wall 39 . The lower end of the bubble outlet 41 is surely located above the liquid level 14 . Preferably, the upper end of the bubble outlet 41 is away from the top plate 36 . One or a plurality of bubble outlets 41 may be arranged. The bubble outlet 41 may be disposed on one side far from the separation tank 29 when viewed from above.

The upper partition plate 27 is erected inside the bubble tank 23 with a space|interval with the bottom surface 22a. The upper partition plate 27 is parallel to the side plate 23d. The upper end of the upper partition plate 27 is higher than the circulation port 31a. The upper partition plate 27 extends upward from the liquid level 14 .

The lower partition plate 25 is erected on the bubble tank 23 in contact with the bottom surface 22a. The lower partition plate 25 is disposed between the side plate 23d and the upper partition plate 27 in parallel with the side plate 23d. The upper end of the lower partition plate 25 is lower than the circulation port 31a. The upper end of the lower partition plate 25 is located below the liquid level 14 .

One or a plurality of upper partition plates 27 and one or a plurality of lower partition plates 25 may be disposed. For example, only one lower partition plate 25 may be disposed. The upper partition plate 27 and the lower partition plate 25 are alternately arranged.

The recovery gutter 43 is connected to the upper end of the side plate 23d and disposed on the outside of the bubble tank 23 . The recovery trough 43 is disposed to face the bubble outlet 41 . The recovery gutter 43 has a side plate 43c, a bottom plate 43b and a recovery port 43a. The side plate 43c is continuous with the side plate 23c. The upper end of the side plate 43c may have the same height as the upper end of the side plate 23c. Preferably, the bottom plate (43b) is inclined downward toward the recovery port (43a). The recovery port 43a is disposed at the bottom of the recovery gutter 43 .

The outlet 23b is disposed at substantially the same height as the circulation port 31a. The outlet (23b) may be arranged slightly higher than the circulation port (31a). The discharge valve 47 is a two-way valve. The discharge valve 47 is, for example, a manual valve or a solenoid valve. The discharge port 23b is connected to one inlet of the discharge valve 47 . The other inlet of the discharge valve 47 is connected to the drain tank 49 .

The inlet 23a is provided at the lower end of the side plate 23d. The inlet 23a may be disposed on the bottom surface 22a. Preferably, the inlet 23a is disposed at a position remote from the separation tank 29 when viewed from above. For example, the inlet 23a is disposed at a position farther from the separation tank 29 than the lower partition plate 25 and the upper partition plate 27 .

The companion ball 46 may be installed on the top plate 36 . The companion mouth 46 extends in the vertical direction. The lower end of the companion sphere 46 may be disposed below the circulation sphere 31a. Preferably, when viewed from above, the companion ball 46 is disposed at a position far from the separation tank 29 . For example, the companion mouth 46 is disposed at a position farther from the separation tank 29 than the lower partition plate 25 and the upper partition plate 27 when viewed from above.

The coalescer 26 is disposed along the side plate 23d, the upper partition plate 27 and the lower partition plate 25 . The coalescer 26 has a plurality of platelets 26a and a connecting rod 26b. The platelet 26a is, for example, an elongated rectangle and extends in the horizontal direction. The platelet 26a has a size of, for example, 30 mm x 60 mm to 50 mm x 100 mm. The two long sides of the platelet 26a are bent downward, for example. The cross-section of the platelet 26a may be V-shaped or U-shaped. The platelets 26a are aligned in the vertical direction at equal intervals, for example. The plurality of platelets 26a are connected by a connecting rod 26b.

The liquid supply pump 15 has a liquid supply port 15a and a discharge port 15b. The liquid supply pump 15 is, for example, a centrifugal pump or a pneumatic driven diaphragm pump. The liquid supply pump 15 may be disposed in the tank 11 . The outlet 15b is connected to the inlet 23a via a generator 17 . The liquid supply port 15a is connected to the tank 11 .

The generator 17 is, for example, a known microbubble generator. The generator 17 is, for example, of the air shear type. Preferably, the generator 17 produces a bubble of between 20 μm and 50 μm. The generator 17 is disposed outside the bubble tank 23 . The generator 17 has an air inlet 17e, a treatment liquid inlet 17f, and an outlet (second outlet, 17g). Preferably, the air inlet 17e is connected to outside air through the check valve 19 and the throttle 21 . The check valve 19 has an inlet (a first inlet, 19a) and an outlet (a first outlet, 19b). The inlet 19a is connected to the throttle 21 . The outlet 19b is connected to the air inlet 17e. The check valve 19 prevents the treatment liquid from being discharged to the outside air from the air inlet 17e. The processing liquid inlet 17f is connected to the discharge port 15b. The outlet 17g is connected to the inlet 23a.

The bubble removal pump 45 has a suction port 45a and a discharge port 45b. The defoaming pump 45 is, for example, an ejector pump, a diaphragm pump, or a rotary pump. The suction port 45a is connected to the recovery port 43a. The discharge port 45b is connected to the companion port 46 .

In addition, the bubble outlet 41, the recovery gutter 43, the bubble removal pump 45 and the companion port 46 may be omitted.

A liquid treatment method will be described with reference to FIGS. 1 and 4 .

The liquid supply pump 15 transfers the treatment liquid 13 from the tank 11 to the generator 17 . The generator 17 sucks air from the air inlet 17e and mixes the air into the treatment liquid 13 as fine bubbles (S1).

The treatment liquid 13 mixed with microbubbles is introduced into the bubble tank 23 from the inlet 23a (S2).

The microbubbles are attached to the oil and foreign matter in the treatment liquid 13 (S3).

The treatment liquid 13 flows through the bubble tank 23 while passing above the lower partition plate 25 and below the upper partition plate 27 . Oil and foreign matter to which microbubbles are attached floats in the bubble tank 23 (S4).

Oil and foreign matter to which air bubbles are attached are combined with each other (S5). When the processing liquid 13 passes through the coalescer 26 , the flow of the processing liquid 13 becomes irregular. The oil and foreign matter to which air bubbles adhere collide with the platelet 26a, or the oil and foreign matter to which air bubbles adhere to each other, thereby promoting the bonding of the oil and foreign matter.

Oil and foreign substances float as floating substances in the floating chamber 33 together with air bubbles. When the floating object fills the floating chamber 33 , the floating object overflows from the bubble outlet 41 . The overflowed floating material is recovered to the recovery gutter 43 (S6).

The bubble removal pump 45 sucks the recovered floating material. Bubbles in the floating object are lost by decompression and disappear. The floating object from which air bubbles are removed flows into the bubble tank 23 from the companion mouth 46 (S7).

The treatment liquid 13 flows into the separation tank 29 from below the separation wall 29a (S11).

The treatment liquid 13 overflows into the circulation port 31a, and is circulated to the tank 11 through the circulation pipe 31 (S12).

The discharge valve 47 is opened, and the floating object is discharged from the discharge port 23b (S21). The discharge valve 47 is opened, for example, every 500 hours to discharge a floating object.

Steps S1 to S7, S11 and S12 are successively executed. In addition, steps S6 and S7 can be omitted.

The floating material overflowing from the bubble outlet (41) is recovered to the recovery gutter (43), the bubbles are removed, and returned to the bubble tank (23). For this reason, the processing liquid 13 contained in the floating object discharged from the discharge port 23b is reduced.

Since the bubble tank 23 is closed, extinction of a bubble is accelerated|stimulated. Since the side plate 23c extends upward from the top plate 36 , it is suppressed that the bubbles overflowing from the bubble outlet 41 overflow from the treatment tank 22 .

(Second embodiment)

5 and 6 , the liquid processing apparatus 100 of the present embodiment includes a processing tank 122 . The treatment tank 122 has a first top plate 35 , a second top plate 37 , a side plate 23e , and a side wall 139 .

The side plate (23e) divides the bubble tank (23) and the recovery gutter (43). The upper end of the side plate 23e is lower than the upper end of the side plate 23c.

The first top plate 35 and the second top plate 37 cover the upper side of the bubble tank 23 .

The first top plate 35 is inclined so as to rise from the upper end of the side plate 23e toward the center of the treatment tank 122 . The first top plate 35 is connected to the side plate 23e.

The second top plate 37 is disposed higher than the first top plate 35 in the central portion of the treatment tank 122 . The second top plate 37 may be inclined so that a point farther from the side plate 23d is downward. The second top plate 37 is connected to the partition wall 29a. The second top plate 37 is surely spaced apart from the liquid level 14 .

The bubble outlet 41 is disposed above the first top plate 35 and below the second top plate 37 . The bubble outlet 41 is located above the circulation port 31a. Between the first top plate 35 and the second top plate 37 , a side wall 139 may be disposed. The bubble outlet 41 may be disposed on the sidewall 139 . For example, between the first top plate 35 and the second top plate 37, a narrow side wall 139 is disposed vertically and a plurality of bubble outlets 41 extending long in the horizontal direction to the side wall 139 is placed The side wall 139 holds the first top plate 35 and the second top plate 37 .

The companion ball 46 may be installed on the first top plate 35 .

A liquid treatment method will be described with reference to FIG. 4 . The floating oil and foreign substances float above the liquid level 14 together with air bubbles as floating substances. When the floating object fills the floating chamber 33 , the floating object overflows from the bubble outlet 41 . The overflowed floating matter flows down the upper surface of the first top plate 35 and is recovered to the recovery gutter 43 (S6).

Other steps are the same as in the first embodiment.

In addition, the present invention is not limited to the embodiment described above, various modifications are possible without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are the subject of the present invention . Although the above embodiment shows preferred examples, those skilled in the art can realize various alternatives, modifications, variations or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the appended claims.

10 Liquid treatment device
11 tank
13 treatment liquid
17 Generator (Bubble Generator)
23 bubble tank
23b outlet (floating object outlet)
29 Separation tank
43 recovery gutter
45 Defoaming Pump
31a circulation

Claims (13)

A liquid supply pump 15 for transferring the processing liquid 13 stored in the tank 11;
As a bubble tank 23 into which the treatment liquid 13 flows,
a floating object discharge port 23b disposed near the liquid level 14 of the processing liquid 13 and discharging floating objects floating on the processing liquid 13;
a bubble tank 23 having a bubble outlet 41 disposed thereon;
As a microbubble generator 17 disposed outside the bubble tank 23, the microbubble generator 17 generates microbubbles by mixing air into the treatment solution 13 transferred from the liquid supply pump 15. Wow,
a separation tank 29 connected to the bubble tank 23 and the lower part;
a circulation pipe (31) for returning the treatment liquid (13) overflowing from the liquid level (14) of the separation tank (29) to the tank (11);
a recovery trough 43 disposed below the bubble outlet 41 and recovering the floating material discharged from the bubble outlet 41;
A bubble removal pump (45) having a suction port (45a) connected to the recovery gutter (43) and a discharge port (45b) connected to the bubble tank (23);
A liquid treatment device comprising a. According to claim 1,
A check valve 19 having a first inlet 19a open to the atmosphere and a first outlet 19b
further comprising,
The bubble tank 23 has a second inlet (23a) disposed at the bottom,
The microbubble generator 17,
a treatment liquid inlet (17f) connected to the liquid supply pump (15);
an air inlet (17e) connected to the first outlet (19b);
and a second outlet (17g) connected to the second inlet (23a). 3. The method of claim 1 or 2,
The liquid treatment apparatus further comprising a floating object discharge valve (47) connected to the floating object outlet (23b). 3. The method of claim 1 or 2,
As a lower partition plate (25) disposed in the bubble tank (23),
a lower end in contact with the bottom surface (22a) of the bubble tank 23;
The upper end located below the liquid level (14)
a lower partition plate 25 having a
As an upper partition plate (27) disposed in the bubble tank (23),
an upper end positioned above the liquid level 14;
A lower end positioned above the bottom surface 22a in the vicinity of the bottom surface 22a
The liquid treatment apparatus further comprising an upper partition plate (27) having a. 3. The method of claim 1 or 2,
As the coalescer 26 disposed in the bubble tank 23, the coalescer 26 extending in the horizontal direction and having a plurality of platelets 26a disposed in the vertical direction with a gap therebetween is further added. A liquid treatment device comprising. 3. The method of claim 1 or 2,
The bubble tank 23 has a side wall 39,
and the bubble outlet (41) is disposed on the side wall (39). 3. The method of claim 1 or 2,
The bubble outlet (41) is disposed above the bubble tank (23) so as to be spaced apart from the liquid level (14). 3. The method of claim 1 or 2,
The recovery gutter (43) is disposed below the recovery gutter (43) and includes a recovery port (43a) connected to the suction port (45a). 3. The method of claim 1 or 2,
The bubble tank 23 is
A first top plate (35) rising from the recovery gutter (43) toward the center of the bubble tank (23);
and a second top plate 37 disposed on the opposite side of the recovery gutter 43 and positioned above the first top plate 35 in the central part of the bubble tank 23,
and the bubble outlet (41) is disposed between the first top plate (35) and the second top plate (37). Microbubbles of air are mixed from the outside of the bubble tank 23 into the treatment liquid 13 containing foreign substances and oils stored in the tank 11,
The treatment liquid 13 in which the microbubbles are mixed flows into the bubble tank 23,
The microbubbles are attached to the foreign material and the oil and float in the bubble tank 23,
The treatment liquid 13 flows into the separation tank 29 from below the bubble tank 23,
Circulating the treatment liquid 13 in the separation tank 29 to the tank 11,
Discharging the floating material from above the liquid level 14 of the bubble tank 23,
The floated fine bubbles, the foreign matter, the oil, and the floated matter including the treatment liquid 13 fill the bubble tank 23 and overflow from the bubble outlet 41,
The floating material is recovered to the recovery gutter 43,
The bubbles of the floating object recovered by the recovery gutter 43 are broken and returned to the bubble tank 23,
liquid treatment method. 11. The method of claim 10,
The liquid treatment method, wherein the foreign matter and the oil to which the microbubbles are attached collide with the platelet 26a. delete delete

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