Swiveling shear nozzle, emulsion separator, emulsion removal device, and wastewater treatment device.

Abstract

To improve the processing performance of emulsions. [Solution] The swirling shear nozzle comprises a nozzle body extending cylindrically in a first direction. The nozzle body has a gas supply port for supplying gas into the nozzle body in a first direction, a liquid supply port for supplying liquid into the nozzle body in a direction intersecting the first direction, and a discharge port for discharging liquid containing bubbles from the nozzle body. The discharge port has a tapered shape that widens toward the downstream side of the first direction in a second direction perpendicular to the first direction.

Description

Technical Field

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[0001] The present invention relates to a drainage treatment technology using a swivel shear nozzle.

Background Art

[0002] In the manufacturing process of products (for example, the cleaning process and the waste liquid treatment process), it may be necessary to remove organic components from the waste liquid. Emulsions are often included in organic components. The following Patent Document 1 discloses a technique for demulsifying emulsions contained in waste liquid using a swivel shear type microbubble generator and removing oil components.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the technology of Patent Document 1 still has room for improvement in the treatment performance of emulsions. In addition, in drainage treatment, the construction of an efficient system as a whole is expected.

Means for Solving the Problems

[0005] The present invention has been made to solve at least a part of the above problems, and can be realized, for example, in the following forms.

[0006] According to a first embodiment of the present invention, a swirling shear nozzle is provided. This nozzle comprises a nozzle body extending cylindrically in a first direction. The nozzle body has a gas supply port for supplying gas into the nozzle body in a first direction, a liquid supply port for supplying liquid into the nozzle body in a direction intersecting the first direction, and a discharge port for discharging liquid containing bubbles from the nozzle body. The discharge port has a tapered shape that widens toward the downstream side of the first direction in a second direction perpendicular to the first direction.

[0007] With this nozzle, the liquid to be treated, which contains an emulsion (for example, factory wastewater), is supplied from the liquid supply port into the nozzle. This liquid flows in a swirling motion along a first direction and is discharged from the discharge port. Since the discharge port has a tapered shape, the direction of the liquid flow changes abruptly from the first direction to the direction along the tapered shape. This change in flow direction generates a large shear force. This large shear force can improve the emulsion processing performance compared to conventional fine bubble generating nozzles. For example, it can improve the deemulsification performance by removing surfactants adhering to the oil components contained in the emulsion. Alternatively, it can improve the performance of atomizing the emulsion.

[0008] According to a second embodiment of the present invention, in the first embodiment, the nozzle is a property-changing nozzle used to change the physical properties of the emulsion. In other words, the nozzle can be used for various processes that involve changing the physical properties of the emulsion.

[0009] According to a third embodiment of the present invention, in the second embodiment, the nozzle is a demulsifying nozzle used for demulsifying the emulsion. In other words, the "change in physical properties" in the second embodiment may include demulsification of the emulsion.

[0010] According to a fourth embodiment of the present invention, in the second or third embodiment, the nozzle is a micronizing nozzle used for micronizing the emulsion. In other words, the "change in physical properties" in the second embodiment may include micronization of the emulsion.

[0011] According to a fifth embodiment of the present invention, in any of the first to fourth embodiments, the distance between the base end and the tip in the first direction of the tapered shape is 0.2 mm or more, and the distance between the base end and the tip in the second direction is 0.2 mm or more. According to this embodiment, a shear force that can effectively improve the emulsion processing performance can be secured depending on the nozzle usage conditions.

[0012] According to a sixth embodiment of the present invention, in any of the first to fifth embodiments, the nozzle is equipped with a baffle member positioned opposite the discharge port, which changes the direction of the liquid flow discharged from the discharge port. In this embodiment, the liquid flow discharged from the discharge port changes direction abruptly upon impact with the baffle member. This change in flow direction generates a shear force, which further improves the emulsion processing performance.

[0013] According to a seventh embodiment of the present invention, in any of the first to fifth embodiments, the nozzle includes a ball that is spaced apart from and facing the discharge port in a first direction, and is held so as to be displaceable in the first direction. In this embodiment, the flow of liquid discharged from the discharge port collides with the ball, causing its direction to change abruptly. This change in flow direction generates a shear force, which further improves the emulsion processing performance. The ball is attracted towards the nozzle body by the negative pressure in the central portion of the nozzle body along the first direction, and is also subjected to a force that separates it from the nozzle body when the liquid discharged from the discharge port collides with it, so that it can be held in a floating state at the appropriate location in the first direction.

[0014] According to the eighth embodiment of the present invention, in any of the first to fifth embodiments, the nozzle body includes a first nozzle body and a second nozzle body. The first nozzle body and the second nozzle body are arranged such that the discharge port of the first nozzle body and the discharge port of the second nozzle body face each other, and the direction of the swirling flow of the discharged liquid is opposite. In this embodiment, the liquid discharged from the discharge port of the first nozzle body and the liquid discharged from the discharge port of the second nozzle body collide and decelerate rapidly, generating a shear force, thereby further improving the emulsion processing performance.

[0015] According to a ninth embodiment of the present invention, an emulsion separation apparatus is provided. This emulsion separation apparatus comprises a nozzle of any of the first to eighth embodiments and a water tank in which the nozzle is installed. The liquid in the water tank is supplied to the nozzle from a liquid supply port, passes through the nozzle, and is discharged into the water tank from a discharge port, thereby circulating within the water tank and separating the emulsion. With this emulsion separation apparatus, the emulsion in the liquid can be separated by repeatedly circulating the liquid between the water tank and the nozzle.

[0016] According to a tenth embodiment of the present invention, an emulsion removal device is provided. This emulsion removal device comprises a nozzle of any of the first to eighth embodiments, a first tank in which the nozzle is located, through which wastewater supplied to a liquid supply port and discharged from a discharge port flows, a second tank communicating with the first tank only above the upper end of the first tank, and having a discharge port below the upper end of the first tank, and a removal device for removing oil captured by bubbles floating in the second tank. With this emulsion removal device, the emulsion can be efficiently separated into oil and surfactant by the nozzle, and the separated oil can be captured and removed by bubbles. Therefore, the emulsion removal performance can be improved.

[0017] According to an eleventh embodiment of the present invention, a wastewater treatment system is provided. This wastewater treatment system comprises an emulsion separator according to the ninth embodiment, or an emulsion removal device according to the tenth embodiment, and a water treatment facility located downstream of the emulsion separator or emulsion removal device. The water treatment facility includes at least one of a biological treatment facility, a concentration facility, a coagulation facility, a centrifugal separator, and an ozone aeration facility. According to this wastewater treatment system, the wastewater to be treated is sent to the downstream water treatment facility after at least partially separating or removing the emulsion contained therein. Therefore, the load on the downstream water treatment facility can be significantly reduced.

[0018] A wastewater treatment system is provided according to a twelfth embodiment of the present invention. This wastewater treatment system comprises an emulsion separator according to a ninth embodiment, or an emulsion removal device according to a tenth embodiment, a flow rate adjustment tank located downstream of the emulsion separator or emulsion removal device, and a water treatment facility located downstream of the flow rate adjustment tank. With this wastewater treatment system, the wastewater to be treated is sent to the downstream flow rate adjustment tank after at least partially separating or removing the emulsion contained therein. Therefore, it is possible to suppress clogging of the piping for sending wastewater to the flow rate adjustment tank (for example, piping from an oil-water separator to a flow rate adjustment tank) with emulsion.

[0019] A wastewater treatment system is provided according to a thirteenth embodiment of the present invention. This wastewater treatment system comprises an emulsion separator or emulsion removal device and a water treatment facility located downstream of the emulsion separator or emulsion removal device. The water treatment facility includes at least one of a biological treatment facility, a concentration facility, a coagulation facility, a centrifugal separator, and an ozone aeration facility. This wastewater treatment system provides the same effects as the eleventh embodiment.

[0020] According to the 14th aspect of the present invention, a wastewater treatment system is provided. This wastewater treatment system includes an emulsion separation device or an emulsion removal device, a flow rate adjustment tank disposed downstream of the emulsion separation device or the emulsion removal device, and a water treatment facility disposed downstream of the flow rate adjustment tank. According to this wastewater treatment system, the same effects as those of the 12th aspect can be obtained.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic diagram showing the overall configuration of an emulsion removal device according to an embodiment of the present invention. [Figure 2] It is a schematic cross-sectional view of a nozzle according to the first embodiment. [Figure 3] It is a block diagram showing an example of a wastewater treatment system using an emulsion removal device. [Figure 4] It is a block diagram showing an example of a wastewater treatment system using an emulsion removal device. [Figure 5] It is a schematic cross-sectional view of a nozzle according to the second embodiment. [Figure 6] It is a schematic cross-sectional view of a nozzle according to the third embodiment. [Figure 7] It is a schematic cross-sectional view of a nozzle according to the fourth embodiment. [Figure 8] It is a schematic diagram showing the schematic configuration of an emulsion separation device according to the fifth embodiment.

Modes for Carrying Out the Invention

[0022] FIG. 1 is a schematic diagram showing the overall configuration of an emulsion removal device 10 according to an embodiment of the present invention. The emulsion removal device 10 is a device for demulsifying a liquid to be treated containing an emulsion and removing the separated oil therefrom. The liquid to be treated may contain non-emulsified oil, and this oil may also be removed together.

[0023] As shown in Figure 1, the emulsion removal device 10 includes a nozzle 20, a first tank 30, a second tank 40, and a removal device 50. The emulsion removal device 10 is supplied with a liquid to be treated (hereinafter simply referred to as "liquid") from a liquid to be treated tank 80. In this embodiment, the liquid to be treated tank 80 is divided into a first tank 81 and a second tank 82 by a partition wall 83. The partition wall 83 does not reach the bottom surface of the liquid to be treated tank 80. Therefore, the first tank 81 and the second tank 82 are in communication below the partition wall 83. However, the liquid to be treated tank 80 does not necessarily have a partition wall 83.

[0024] The liquid in the liquid tank 80 to be processed is supplied to the nozzle 20 from the second tank 82 via the pump 84. The nozzle 20 is a swirling shear type nozzle capable of generating fine bubbles.

[0025] Figure 2 is a schematic cross-sectional view of a nozzle 20 according to the first embodiment. As shown in Figure 2, the nozzle 20 includes a nozzle body 21 that extends cylindrically in a first direction D1. The nozzle body 21 has a gas supply port 22, a liquid supply port 23, and a discharge port 24. The gas supply port 22 and the liquid supply port 23 are located on one side of the nozzle body 21 in the first direction D1, and the discharge port 24 is located on the other side. The inside of the nozzle body 21 has a tapered portion 27. The tapered portion 27 is a part in which the inner diameter decreases as it approaches the discharge port 24 along the first direction D1.

[0026] Liquid is supplied from the second tank 82 to the liquid supply port 23. The liquid supply port 23 opens in a direction intersecting the first direction D1 (more specifically, in the tangential direction of the cylindrical nozzle body 21). When liquid is supplied into the nozzle body 21 from the liquid supply port 23, a swirling flow is generated around the central axis AX1 along the first direction D1 of the nozzle body 21. This swirling flow has a velocity component directed toward the discharge port 24. In addition, a negative pressure is generated in the center 28 of the nozzle body 21 (near the central axis AX1) due to the centrifugal force acting on the liquid. As a result, gas is drawn into the center 28 from the gas supply port 22 in the first direction D1. In this embodiment, the gas is air, but any gas (for example, an inert gas) may be used instead of air.

[0027] The gas drawn into the central part 28 gradually breaks apart at the interface with the swirling flow, forming bubbles. Furthermore, as the inner diameter of the tapered section 27 gradually decreases toward the discharge port 24, the swirling speed of the swirling flow gradually increases. At the moment the swirling flow containing bubbles is discharged from the discharge port 24, the cross-sectional area of ​​the flow path rapidly increases, causing the swirling speed of the swirling flow to rapidly decrease. This difference in swirling speed causes the gas to be sheared, generating microbubbles. In an alternative embodiment, the tapered section 27 may be replaced with a section having a constant inner diameter. Microbubbles here refer to bubbles with a diameter of 100 μm or less, including so-called microbubbles (bubbles with a diameter of 1 μm or more and 100 μm or less). The bubble size referred to in this application is measured by the visualization method.

[0028] The discharge port 24 has a circular cross-section perpendicular to the first direction D1. In this embodiment, the discharge port 24 has a tapered shape that widens in the second direction D2 toward the downstream side of the first direction D1. The second direction D2 is a direction perpendicular to the first direction D1 and is also the radial direction with respect to the central axis AX1. The distance in the first direction D1 between the base end 25 and the tip end 26 of the tapered shape of the discharge port 24 is also called the width W1. The distance in the second direction D2 between the base end 25 and the tip end 26 is also called the width W2.

[0029] With a discharge port 24 of this shape, when liquid exits the discharge port 24, the direction of the liquid flow changes abruptly along the tapered shape of the discharge port 24. In other words, the direction of the liquid flow changes abruptly from the first direction D1 to a radially outward direction along the tapered shape of the discharge port 24. Such abrupt change in the direction of flow generates a large shear force. In short, due to the tapered shape of the discharge port 24, the nozzle 20 can significantly increase the shear force generated in the liquid discharged from the discharge port 24 compared to conventional fine bubble generating nozzles.

[0030] Such large shear forces can cause changes in the physical properties of emulsions contained in liquids. These changes include demulsification and micronization of the emulsion. Demulsification refers to the removal of surfactants attached to the oil components of the emulsion by shear forces, separating the oil from the water. Micronization refers to the breaking down of the oil components in the emulsion into smaller pieces by shear forces, while the surfactants remain attached. Typically, demulsification and micronization occur simultaneously.

[0031] The widths W1 and W2 that define the tapered shape of the discharge port 24 can be appropriately set according to the capacity (flow rate), dimensions, and water quality of the liquid to be treated of the nozzle 20. Setting W1 ≥ 0.2 mm and W2 ≥ 0.2 mm makes it easier to process the discharge port 24 and can be expected to effectively increase the shear force. One or both of the widths W1 and W2 may be 0.5 mm or more, or 1.0 mm or more, or 2.0 mm or more.

[0032] Now, let's return to Figure 1 for the explanation. The nozzle 20 is placed in the first tank 30. In the example shown in Figure 1, only the tip of the nozzle 20 (near the discharge port 24) is located inside the first tank 30. However, the entire nozzle 20 may be placed inside the first tank 30. In this embodiment, the first tank 30 has a cylindrical shape, and the nozzle 20 is placed at its bottom. The second tank 40 also has a cylindrical shape and concentrically surrounds the outer circumference of the first tank 30.

[0033] The second tank 40 is in communication with the first tank 30 only above the upper end 31 of the first tank 30. At all other points, the first tank 30 and the second tank 40 are completely isolated. The second tank 40 also has an outlet 41 below the upper end 31 of the first tank 30. The liquid supplied into the first tank 30 from the discharge port 24 of the nozzle 20 flows upward due to the pressure of the pump 84, overflowing the upper end 31 of the first tank 30 and flowing into the second tank 40. While the liquid flows through the first tank 30, the microbubbles float, capturing oil from the liquid. As described above, the emulsion contained in the liquid is demulsified by the nozzle 20, so the microbubbles can efficiently capture the oil contained in the emulsion. As the liquid overflows, the bubbles containing the collected oil (hereinafter also referred to as "post-collection bubbles") also overflow from the upper end 31 of the first tank 30 and flow into the second tank 40. The liquid in the first tank 30 (including the post-collection bubbles) can only flow from the first tank 30 to the second tank 40 through the path that overflows from the upper end 31 of the first tank 30. Therefore, the post-collection bubbles in the first tank 30 are never discharged from the outlet 41 without ever rising to near the liquid surface. A flow straightening member may be appropriately placed in at least one of the first tank 30 and the second tank 40.

[0034] Post-collected bubbles that flow into the second tank 40 and remain near the water surface are removed from the liquid by the removal device 50 and discharged into the storage tank 90. ​​Specifically, the removal device 50 comprises a scraping plate 51 and a motor 52. The scraping plate 51 is positioned to extend from above the water surface of the second tank 40 to slightly below the water surface. The scraping plate 51 is rotated parallel to the liquid surface by the motor 52. This scrapes off post-collected bubbles near the water surface of the second tank 40 and discharges them into a discharge chute (not shown). The discharge chute is provided in a cross-section not shown in Figure 1, separated from the second tank 40 on the rotational trajectory of the scraping plate 51. The oil discharged into the discharge chute along with the bubbles is stored in the storage tank 90 and periodically removed.

[0035] Meanwhile, the liquid that flows into the second tank 40 is returned to the first tank 81 of the liquid tank 80 to be treated via the outlet 41. In this embodiment, as described above, the liquid tank 80 to be treated is divided into a first tank 81 and a second tank 82. Therefore, even if the collected bubbles settle in the second tank 40 and are discharged into the first tank 81, if the collected bubbles remain near the water surface in the first tank 81, they can be scraped off and removed.

[0036] An example of a wastewater treatment system using the emulsion removal device 10 described above is shown in Figures 3 and 4. The wastewater treatment system 100 shown in Figure 3 is a system for treating factory wastewater and includes a flow rate adjustment tank 110, a biological treatment tank 120, a coagulation tank 130, a sedimentation tank 140, and an emulsion removal device 10. The flow rate adjustment tank 110 temporarily stores wastewater flowing in from the factory and homogenizes the flow rate and water quality of the wastewater flowing into the biological treatment tank 120. In this embodiment, the biological treatment tank 120 uses an aerobic treatment method, but it may also use an anaerobic treatment method, or a combination of aerobic and anaerobic treatment. In the biological treatment tank 120, the emulsion removal treatment removes and reduces factors that inhibit biological treatment, such as oil, and separates and removes target components such as suspended solids in advance, thereby improving the treatment capacity of the biological treatment. In the coagulation tank 130, a coagulant is added to the wastewater after biological treatment to flocculate sludge and other substances in the wastewater. In the coagulation layer 130, emulsion removal treatment removes coagulation inhibitors such as surfactants and oils, and pre-separates and removes substances to be coagulated, such as suspended solids (SS), thereby improving the coagulation treatment capacity and reducing the amount of chemicals used, such as coagulants. The coagulation tank 130 may be installed before the biological treatment tank 120. In the sedimentation tank 140, the flocs are allowed to settle and separated from the supernatant liquid. A portion of the sludge obtained in the sedimentation tank 140 is returned to the biological treatment tank 120, and the excess sludge is disposed of as industrial waste.

[0037] The emulsion removal device 10 is connected to the flow rate adjustment tank 110. In this case, the flow rate adjustment tank 110 corresponds to the treatment target liquid tank 80 shown in Figure 1. In other words, the wastewater stored in the flow rate adjustment tank 110 is led to the emulsion removal device 10, where it is demulsified and oil is removed, and then returned to the flow rate adjustment tank 110.

[0038] In this wastewater treatment system 100, wastewater stored in the flow rate adjustment tank 110 is subjected to emulsion removal by the emulsion removal device 10 before flowing into the biological treatment tank 120. In other words, emulsion removal by the emulsion removal device 10 is performed as a pretreatment for the biological treatment tank 120. Therefore, compared to a wastewater treatment system without the emulsion removal device 10, the water quality load in the biological treatment tank 120 and the downstream processes is significantly reduced. As a result, effects such as a reduction in aeration power in the biological treatment tank 120, a reduction in the frequency of cleaning the biological treatment tank 120, and a reduction in the amount of excess sludge (i.e., the amount of sludge that should be treated as industrial waste) can be obtained. In addition, any emulsion that could not be completely removed by the emulsion removal device 10 is also pulverized by the emulsion removal device 10, thus improving the treatment efficiency in the biological treatment tank 120. Specifically, since the oil that serves as food for microorganisms is pulverized in the biological treatment tank 120, it becomes easier for microorganisms to take in the oil, and the treatment time for biological treatment is shortened.

[0039] The wastewater treatment system 200 shown in Figure 4 is a system for treating factory wastewater and includes an oil-water separator 210, an emulsion removal device 10, a flow rate adjustment tank 110, a biological treatment tank 120, a coagulation tank 130, and a sedimentation tank 140. The oil-water separator 210 and the emulsion removal device 10 are located inside the factory building. The flow rate adjustment tank 110, biological treatment tank 120, coagulation tank 130, and sedimentation tank 140 are the same equipment as those shown in Figure 3 and are located on or off the factory premises at a wastewater treatment plant.

[0040] The emulsion removal device 10 is connected to the oil-water separator 210. In this case, the oil-water separator 210 corresponds to the treated liquid tank 80 shown in Figure 1. That is, the wastewater stored in the oil-water separator 210 is led to the emulsion removal device 10, where it is demulsified and oil is removed, and then returned to the oil-water separator 210. The wastewater from which the emulsion has been removed in this way is then sent from the oil-water separator 210 to the pipe 220 via the pipe 220.

[0041] This wastewater treatment system 200 provides the same effects as the wastewater treatment system 100 shown in Figure 3, and also prevents the pipes 220 from becoming clogged with emulsion. As a result, the cost and labor involved in maintaining the pipes 220 can be reduced.

[0042] Figure 5 is a schematic cross-sectional view of the nozzle 320 according to the second embodiment. The nozzle 320 differs from the nozzle 20 according to the first embodiment in that, in addition to the same nozzle body 21 as the nozzle 20, it is equipped with a baffle member 325. The baffle member 325 is positioned opposite the discharge port 24. In the example shown in Figure 5, the baffle member 325 is supported by a support member (not shown) extending from the nozzle body 21 at a position spaced apart from the nozzle body 21 in a first direction D1. In an alternative embodiment, the baffle member 325 may be attached to the nozzle body 21 so as to abut against the nozzle body 21. In this case, a flow path may be formed within the baffle member 325 to guide the liquid discharged from the discharge port 24 to the outside of the nozzle 320.

[0043] According to the nozzle 320, the liquid discharged from the discharge port 24 collides with the baffle member 325, causing a rapid change in its flow direction. This change in flow direction generates a shear force, which can further improve the demulsification and micronization performance of the emulsion.

[0044] Figure 6 is a schematic cross-sectional view of a nozzle 420 according to the third embodiment. The nozzle 420 differs from the nozzle 20 according to the first embodiment in that, in addition to the same nozzle body 21 as the nozzle 20, it is equipped with a ball 425. The ball 425 is positioned opposite the discharge port 24 at a distance in the first direction D1 and is held in a displaceable manner in the first direction D1 by a support member (not shown) extending from the nozzle body 21. Specifically, the ball 425 is pulled towards the nozzle body 21 by the negative pressure in the center 28 along the first direction D1 within the nozzle body 21, and at the same time, it receives a force that moves it away from the nozzle body 21 when the liquid discharged from the discharge port 24 collides with the ball 425. By balancing these two forces acting on the ball 425 in opposite directions, the ball 425 can be held in a floating state in the appropriate position in the first direction D1. According to the nozzle 420, the flow direction of the liquid discharged from the discharge port 24 changes abruptly when it collides with the ball 425. This change in flow direction generates shear force, which can further improve the emulsion's demulsification and micronization performance.

[0045] Figure 7 is a schematic cross-sectional view of the nozzle 520 according to the fourth embodiment. The nozzle 520 differs from the first embodiment in that it has two nozzle bodies 21. In Figure 7, these two nozzle bodies 21 are distinguished as the first nozzle body 21a and the second nozzle body 21b. The first nozzle body 21a and the second nozzle body 21b are arranged so that the discharge port 24 of the first nozzle body 21a and the discharge port 24 of the second nozzle body 21b face each other, and the direction of the swirling flow of the discharged liquid is opposite. With the nozzle 520, the liquid discharged from the discharge port 24 of the first nozzle body 21a and the liquid discharged from the discharge port 24 of the second nozzle body 21b collide and decelerate rapidly, generating a shear force, which further improves the demulsification and micronization performance of the emulsion.

[0046] Figure 8 is a schematic diagram showing the general configuration of an emulsion separation device 610 according to the fifth embodiment. The emulsion separation device 610 comprises a water tank 615, a nozzle 20 according to the first embodiment, and a pump 84. The water tank 615 may be, for example, the flow rate adjustment tank 110 shown in Figure 3, or the oil-water separation tank 210 shown in Figure 4. In this case, the emulsion separation device 610 may be installed in place of the emulsion removal device 10 shown in Figures 3 and 4. Nozzles 320, 420, 520, etc. may be used instead of nozzle 20. Nozzle 20 is installed inside the water tank 615. In the example shown in Figure 8, the pump 84 is a land-based pump located outside the water tank 615, but it may be a submersible pump located inside the water tank 615.

[0047] The liquid in the water tank 615 is supplied via the pump 84 to the liquid supply port 23 of the nozzle 20, and then into the nozzle 20, passing through the nozzle 20 and being discharged back into the water tank 615 from the discharge port 24, thus circulating repeatedly within the water tank 615. During this circulation process, the emulsion in the liquid is demulsified by the nozzle 20, and the oil rises to the surface. This allows the emulsion in the liquid in the water tank 615 to be separated. The separated oil may be removed in the same manner as the emulsion removal device 10, or in any other manner of choice.

[0048] Although several embodiments of the present invention have been described above, these embodiments are provided to facilitate understanding of the present invention and do not limit it. The present invention can be modified and improved without departing from its spirit, and equivalents thereof are included. Furthermore, any combination or omission of the features described in the claims and specification is possible to the extent that at least some of the above-described problems can be solved or at least some of the effects can be achieved.

[0049] For example, nozzles 20, 320, 420, and 520 can be used in any emulsion removal device, emulsion separation device, or microbubble generator that employs a swirling shear nozzle, instead of the emulsion removal device 10 or emulsion separation device 610 having the above-described configuration.

[0050] Furthermore, the shapes of the first tank 30 and the second tank 40 can be any shape. For example, the first tank 30 and the second tank 40 may have a rectangular tubular shape instead of a cylindrical shape. Alternatively, the first tank 30 may be positioned outside the second tank 40 so that the first tank 30 and the second tank 40 are side by side.

[0051] Furthermore, nozzles 20, 320, 420, 520 and / or emulsion removal device 10 and / or emulsion separation device 610 can be used not only with liquids containing emulsions, but also with any liquid to be processed (e.g., liquids containing oils that are not in the form of emulsions). In addition, nozzles 20, 320, 420, and 520 can be used in various manufacturing processes, depending on their intended use, as property-changing nozzles for altering the physical properties of emulsions, emulsion demulsification nozzles, and / or micronization nozzles. For example, nozzles 20, 320, 420, and 520 may be used in the production process of products (e.g., cosmetics, food, etc.) to micronize emulsions in the product.

[0052] Furthermore, the biological treatment tank 120, coagulation tank 130, and sedimentation tank 140 of the wastewater treatment systems 100,200 can be replaced with any water treatment equipment. Such water treatment equipment can be at least one of the following, or any combination thereof: biological treatment equipment, concentration equipment, coagulation equipment, centrifugal separation equipment, and ozone aeration equipment. For example, if the water treatment equipment includes a steam-heated concentration device, the concentration efficiency in the concentration device can be improved due to emulsion removal occurring upstream of the concentration device. In other words, it is possible to suppress the formation of an oil film on the surface of the wastewater in the concentration device, which reduces the heat exchange efficiency with steam.

[0053] Furthermore, the wastewater treatment systems 100,200 may employ any nozzles and / or emulsion removal devices and / or emulsion separation devices capable of demulsifying and / or micronizing the emulsion, instead of the nozzles 20,320,420,520 and / or emulsion removal devices 10 and / or emulsion separation devices 610. [Explanation of symbols]

[0054] 10...Emulsion removal device 20, 320, 420, 520... nozzles 21... Nozzle body 21a...First nozzle body 21b...Second nozzle body 22...Gas supply port 23...Liquid supply port 24...Discharge port 25... Tapered base of the discharge port 26... Tapered tip of the discharge port 27...Tapered section 28...center 30...First tank 31... Upper end of the first tank 40...Second tank 41...Outlet 50...removal device 51...Scraping board 52...motor 80... Liquid tank to be processed 81...First tank 82...Second tank 83...bulkhead 84...Pump 90...Storage tank 100,200...Wastewater treatment systems 110...Flow rate adjustment tank 120...Biological treatment tank 130... flocculation tank 140...Sedimentation tank 210...Oil water separation tank 220... Piping 325...Baffle component 425...ball 610...Emulsion Separation Unit 615... Aquarium D1...First direction D2...Second direction AX1...center axis line

Claims

1. A rotating shear type nozzle, It comprises a nozzle body that extends cylindrically in a first direction, The nozzle body has a gas supply port for supplying gas into the nozzle body in the first direction, a liquid supply port for supplying liquid into the nozzle body in a direction intersecting the first direction, a discharge port for discharging liquid containing bubbles from the nozzle body, and a tapered portion whose inner diameter decreases towards the discharge port. The discharge port has a tapered shape that widens toward the downstream side of the first direction in a second direction perpendicular to the first direction, The nozzle is a property-changing nozzle used to change the physical properties of an emulsion. nozzle.

2. A rotating shear type nozzle, It comprises a nozzle body that extends cylindrically in a first direction, The nozzle body has a gas supply port for supplying gas into the nozzle body in the first direction, a liquid supply port for supplying liquid into the nozzle body in a direction intersecting the first direction, a discharge port for discharging liquid containing bubbles from the nozzle body, and a tapered portion whose inner diameter decreases towards the discharge port. The discharge port has a tapered shape that widens toward the downstream side of the first direction in a second direction perpendicular to the first direction, The length of the tapered portion in the first direction is greater than the length of the tapered shape of the discharge port in the first direction. nozzle.

3. A rotating shear type nozzle, It comprises a nozzle body that extends cylindrically in a first direction, The nozzle body has a gas supply port for supplying gas into the nozzle body in the first direction, a liquid supply port for supplying liquid into the nozzle body in a direction intersecting the first direction, a discharge port for discharging liquid containing bubbles from the nozzle body, and a tapered portion whose inner diameter decreases towards the discharge port. The discharge port has a tapered shape that widens toward the downstream side of the first direction in a second direction perpendicular to the first direction, The inclination of the tapered portion with respect to the first direction is smaller than the inclination of the tapered shape of the discharge port with respect to the first direction. nozzle.

4. The nozzle according to claim 3, The length of the tapered portion in the first direction is greater than the length of the tapered shape of the discharge port in the first direction. nozzle.

5. A nozzle according to any one of claims 1 to 3, The nozzle body further has a constant diameter portion located between the tapered portion and the discharge port in the first direction, and having the same constant inner diameter as the downstream end of the tapered portion in the first direction. nozzle.

6. A nozzle according to any one of claims 2 to 4, The nozzle is a property-changing nozzle used to change the physical properties of an emulsion. nozzle.

7. The nozzle according to claim 6, The nozzle is a demulsifying nozzle used for demulsifying emulsions. nozzle.

8. The nozzle according to claim 6, The nozzle is a micronization nozzle used for micronizing emulsions. nozzle.

9. A nozzle according to any one of claims 1 to 4, The distance between the base end and the tip of the tapered shape in the first direction is 0.2 mm or more, and the distance between the base end and the tip in the second direction is 0.2 mm or more. nozzle.

10. A nozzle according to any one of claims 1 to 4, The system includes a baffle member positioned opposite the discharge port, which changes the direction of the liquid flow discharged from the discharge port. nozzle.

11. A nozzle according to any one of claims 1 to 4, The ball is positioned opposite the discharge port at a distance from it in the first direction and is held so as to be displaceable in the first direction. nozzle.

12. A nozzle according to any one of claims 1 to 4, The nozzle body includes a first nozzle body and a second nozzle body. The first nozzle body and the second nozzle body are arranged such that the discharge port of the first nozzle body and the discharge port of the second nozzle body face each other, and the direction of the swirling flow of the discharged liquid is opposite. nozzle.

13. Emulsion separation apparatus, The nozzle according to claim 7, A water tank in which the nozzle is installed and Equipped with, The liquid in the tank is supplied from the liquid supply port to the nozzle, passes through the nozzle, and is discharged into the tank from the discharge port, thus circulating within the tank and separating the emulsion within the tank. Emulsion separation apparatus.

14. Emulsion removal device, The nozzle according to claim 7, A first tank in which the nozzle is arranged, through which the wastewater supplied to the liquid supply port and discharged from the discharge port flows, A second tank that communicates with the first tank only above the upper end of the first tank, and has a discharge port below the upper end of the first tank, The second tank is equipped with a removal device to remove oil trapped by bubbles rising to the surface. An emulsion removal device equipped with the following features.

15. A wastewater treatment system, The emulsion separation apparatus according to claim 13, Water treatment equipment located downstream of the emulsion separation device or the emulsion removal device Equipped with, The water treatment facility includes at least one of the following: a biological treatment facility, a concentration facility, a coagulation facility, a centrifugal separator, and an ozone aeration facility. Wastewater treatment system.

16. A wastewater treatment system, The emulsion removal device according to claim 14, Water treatment equipment located downstream of the emulsion separation device or the emulsion removal device Equipped with, The water treatment facility includes at least one of the following: a biological treatment facility, a concentration facility, a coagulation facility, a centrifugal separator, and an ozone aeration facility. Wastewater treatment system.

17. A wastewater treatment system, The emulsion separation apparatus according to claim 13, A flow rate adjustment tank located downstream of the emulsion separation device or the emulsion removal device, Water treatment equipment located downstream of the aforementioned flow rate adjustment tank and A wastewater treatment system equipped with the following features.

18. A wastewater treatment system, The emulsion removal device according to claim 14, A flow rate adjustment tank located downstream of the emulsion separation device or the emulsion removal device, Water treatment equipment located downstream of the aforementioned flow rate adjustment tank and A wastewater treatment system equipped with the following features.

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