KR20210045249A - Oil-water separator - Google Patents

Abstract

The present invention relates to an oil-water separation device, and more specifically, to a device used to phase-separate an oil-water mixture containing solids into respective solids, oil and water. The oil-water separation device, according to the present invention, comprises: an aeration reaction unit having a cylindrical water tank and a water outlet provided on one side of a lower end of the water tank; and an aeration generating unit composed of an aeration housing passing through an upper side of the aeration reaction unit, an aeration means inserted into the aeration housing, and an aeration activator provided in the water tank at a predetermined distance from a lower end of the aeration housing, wherein an oil-water separation unit comprising an oil separation tank in which a solid screen is formed and an oil-water inlet and an oil outlet are connected while accommodating the solid screen is provided on an upper portion of the aeration reaction unit, and thus, the solids contained in the oil-water mixture are filtered and accumulated in the solids screen, and the oil bubbles floating and separated by the microbubbles generated in the aeration means pass through the solids screen, together with the accumulated solids through the oil outlet. The present invention preferentially separates solids from an oil-water mixture containing solids, the oil separated from the water is mixed with the fine bubbles generated from the aeration means and discharged. Thus, a failure of an impeller in an oil-water separation device is prevented and oil-water separation efficiency can be increased.

Description

Oil-water separator

The present invention relates to an oil-water separation apparatus, and more particularly, to an apparatus used to phase-separate an oil-water mixture containing solids into respective solids, oils and water.

In order to separate the oil-water mixture into water and oil, there are chemical treatment using a chemical agent and mechanical treatment using a filter. In the case of chemical treatment, the possibility of secondary contamination by chemicals and a process for re-treatment are required, and in the case of mechanical treatment, maintenance costs are incurred due to filter replacement, which increases operational costs from a long-term perspective. Is inherent. Due to the above-described problem, the most commonly used oil-water separator uses the difference in specific gravity between water and oil to sediment and separate water and float-separate oil, but to facilitate the sedimentation and flotation process. A means for applying an external force is further provided and used.

Similar prior art is the Republic of Korea Utility Model Publication No. 20-2010-0006937 (2010.07.08)'Separating device for mixed liquid using a centrifugal impeller capable of high-speed rotation'. In the prior art, the housing; An inlet pipe formed on an upper side of the housing and into which the mixed liquid is introduced; An outlet pipe formed on a lower side of the housing and through which a liquid having a large specific gravity of the mixed liquid flows out; A rotation shaft installed on the upper portion of the housing and rotated by a motor; A technique for separating a mixed liquid using a centrifugal impeller capable of high-speed rotation has been disclosed, which is composed of three impellers attached to a specific position of the rotation shaft and rotated together with the rotation shaft.

Another prior art is Korean Laid-Open Patent Publication No. 10-2001-0107247 (2001.12.07.)'Oil-water separation apparatus and method'. In the prior art, the outer housing is supported by a buoyant body so as to be positioned directly below the water surface, and has an open upper portion and an opening formed at a lower portion thereof; A water discharge device mounted on a plate under the outer housing and forcibly discharging water inside the outer housing through an opening formed in the plate; An inner housing fixed inside the outer housing, forming a space with a predetermined interval between the outer peripheral surface of the lower portion and the upper inner peripheral surface of the outer housing, the inner space being divided into an upper space and a lower space; Disclosed is a technology including an oil lifting means for lifting oil collected in a lower space of the inner housing to the outside by being mounted on a member separating the inner space of the inner housing.

Another prior art is Korean Patent Publication No. 10-0760771 (2007.09.14.)'Oil-water separator to which an ultrafine bubble generating device with excellent oxygen generating ability is applied'. In the prior art, an air compressor and a mixer for mixing through a pressure pump that pressurizes and pumps wastewater mixed with water and oil while air compressed from the air compressor is introduced, and wastewater consisting of air, water and oil, Pressurized water in a state in which water, air and oil are evenly mixed in the mixer is introduced to be sprayed on the perforated plate, and the pressure tank that separates the three phases of water, air and oil by weakening the bonding force of the oil dissolved in the water and , The pressurized water separated into three phases in the pressurized tank is released from pressure through a pressurized water discharger, and a technology comprising an oil-water separator main body is disclosed.

However, in the prior art described above, failure of the impeller may be caused by the absence of a means for filtering solids contained in the oil-water mixture, and thus there is a problem that the oil-water separation efficiency may be deteriorated. In addition, since additional devices such as an air compressor for generating microbubbles and a pressure pump and a mixer for pressurizing and pumping the oil-water mixture are further required, the configuration of the oil-water separation device is complicated.

Republic of Korea Utility Model Publication No. 20-2010-0006937 (2010.07.08.)'Separation device for mixed liquid using centrifugal impeller capable of high-speed rotation' Republic of Korea Patent Publication No. 10-2001-0107247 (2001.12.07.)'Oil-water separation apparatus and method' Republic of Korea Patent Publication No. 10-0760771 (2007.09.14.)'Oil-water separator applied with ultra-fine bubble generating device with excellent oxygen generating ability'

The present invention aims to meet the technical necessity required from the background of the above invention. Specifically, an object of the present invention was conceived to solve the problems of the conventional oil-water separation apparatus, and a means for separating the solids preferentially from the oil-water mixture containing the solids, and aeration means for the floating-separated oil from the water. It is an object to provide an oil-water separation device capable of preventing failure of the impeller in the oil-water separation device and increasing the efficiency of oil-water separation by mixing and discharging the microbubbles generated from the water and sedimenting and discharging the water.

The technical problems to be achieved by the present invention are not limited to the above-mentioned problems, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

The oil-water separation apparatus according to the present invention for achieving this purpose comprises: an aeration reaction unit consisting of a cylindrical water tank and a water outlet provided at one side of the lower end of the water tank; Consisting of: an aeration housing penetrating the upper one side of the aeration reaction unit, an aeration means inserted into the aeration housing, an aeration activator provided inside the water tank at a predetermined distance from the lower end of the aeration housing; However, an oil-water separation unit comprising an oil separation tank in which a solids screen is formed on the aeration reaction unit and is connected to an oil-water inlet and an oil outlet while accommodating the solids screen. It is characterized in that the oil bubbles that are filtered and accumulated on the solids screen and floated and separated by the microbubbles generated by the aeration means are discharged through the oil outlet together with the accumulated solids while passing through the solids screen.

As described above, according to the present invention, through the configuration of an air circulation pipe in which an air inlet hole and an air discharge hole are formed and the inner diameter is gradually reduced, microbubbles are formed in the oil-water mixture containing solids by the interaction of the rotational force of the impeller connected to the electric motor. It has the effect of generating and separating the oil composition. In other words, since the oil can be separated from the oil without a pressurizing and mixing device such as an air compressor, a pressurizing pump, and a mixer, it is possible to simplify the configuration of the oil-water separation device and reduce the electric energy consumption required when the oil-water separation device is driven. As it can be reduced, there is an effect of increasing energy efficiency. In addition, the oil-water mixture containing solids is configured to be injected into the top of the oil-water separation device, and a screen for filtering solids is provided on the top of the oil-water separation device, thereby minimizing the effect of the solids on the rotation of the impeller. .

The technical effects of the present invention are not limited to the technical effects mentioned above, and other technical effects not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the description of the claims. There will be.

1 is a perspective view of an oil-water separation device according to the present invention;
Figure 2 is a cross-sectional view of the oil-water separation device according to the present invention;
3 is a cross-sectional view showing a configuration relationship between an aeration housing, an aeration means, and an aeration activator constituting the oil-water separation device according to the present invention;
Figure 4 is an enlarged perspective view of the aeration activator provided inside the oil-water separation device according to the present invention;
5 is a plan view of a state in which an aeration activator is provided in the oil-water separation device according to the present invention;
6 is a plan view of a state in which a solids screen is provided on the top of the oil-water separation device according to the present invention.

Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be specifically realized will be described with reference to the accompanying drawings, but this is for easier understanding of the present invention, and the scope of the present invention is limited thereto. It does not become. In addition, in describing the present embodiment, the same name and the same reference numerals are used for the same configuration, and additional descriptions thereof will be omitted.

1 is a perspective view of an oil-water separation apparatus according to the present invention, FIG. 2 is a cross-sectional view of an oil-water separation apparatus according to the present invention, and FIG. 3 is a view of an aeration housing, aeration means, and aeration activator constituting the oil-water separation apparatus according to the present invention. A cross-sectional view showing the configuration relationship, Figure 4 is a perspective view of an aeration activator provided inside the oil-water separation device according to the present invention, Figure 5 is a plan view of a state in which the aeration activator is provided inside the oil-water separation device according to the present invention, 6 is a plan view of a state in which a solids screen is provided on the top of the oil-water separation device according to the present invention.

The oil-water separation device according to the present invention is for separating water and oil components of an oil-water mixture containing solids,

An aeration reaction unit 100 consisting of a cylindrical water tank 110 and a water outlet 120 provided at one side of the lower end of the water tank 110;

The aeration housing 210 passing through the upper one side of the aeration reaction unit 100, the aeration means 220 inserted into the aeration housing 210, the lower end of the aeration housing 210 and a certain distance (D2) It consists of; an aeration generator 200 consisting of an aeration activator 230 provided inside the water tank 110,

A solids screen 310 is formed on the upper part of the aeration reaction unit 100 and is composed of an oil separation tank 340 in which the water inlet 320 and the oil outlet 330 are connected while accommodating the solids screen 310. Oil-water separation unit 300; is further provided,

The solids contained in the oil-water mixture are filtered and accumulated by the solids screen 310, and the oil bubbles floated by the microbubbles generated in the aeration means 220 pass through the solids screen 310, and accumulate. It is characterized in that it is discharged through the oil outlet 330 together with the solid matter.

The detailed configuration and coupling relationship of the aeration reaction unit 100, the aeration generation unit 200, and the oil-water separation unit 300 will be described in more detail with reference to FIGS. 1 to 3.

The aeration reaction unit 100 is provided with a water tank 110 in which an oil-water mixture can be accommodated in a cylindrical shape, and a water outlet 120 for discharging the sedimented water from the oil-water mixture is a lower end of the water tank 110 It is provided on one side, and it is preferable to further install an observation window 130 on one side of the outer circumferential surface of the upper end of the water tank so that the internal state of the water tank 110 can be observed. Through this, it is possible to check whether the oil-water mixture is properly flowing into the water tank 110, and whether the oil is floated and separated by micro-bubbles and is properly discharged. In addition, it is preferable that a level gauge 140 indicating a change in water level is further provided at one side of the lower end of the water tank 110 so that the fluid accommodation state in the water tank 110 can be checked.

In addition, a tubular aeration housing 210 capable of accommodating an aeration means 220, which will be described later, is provided on the upper portion of the water tank 110, and the aeration housing 210 covers an upper side of the water tank 110. It is installed in a penetrating form and serves to provide an installation passage for the aeration means 220. In addition, the aeration means 220 generates micro-bubbles and mixes the micro-bubbles with the oil-water mixture contained in the water tank 110 to induce floating separation of the oil. An aeration activator 230 is further provided with a certain distance D2 from the lower end of the aeration means 220, and the aeration activator 230 further promotes the floating separation in the process of inducing the floating separation of the oil. It is used.

In addition, the water outlet 120 is further provided with a concentration measuring means (not shown) capable of measuring the concentration of oil remaining without being separated from the surface to check the separation efficiency of water and oil, or complying with environmental regulations related to discharged water. It is desirable to be able to determine whether the oil concentration reference value is being discharged.

Among the constituent elements of the aeration generating unit 200, the constituent elements and the coupling relationship for the aeration means 220 for generating fine bubbles will be described in detail as follows.

The aeration means 220 is provided in the form of being inserted into the aeration housing 210, and is provided in a direction corresponding to the flowing water inlet 320 so that the aeration reaction is performed after the oil-water mixture completely flows into the water tank 110. It is desirable to make it happen. The aeration means 220 is for generating micro-bubbles, the impeller 221 for generating a shear stress in the oil-water mixture; A rotation shaft 222 coupled with the impeller 221; An electric motor 223 coupled with the rotation shaft 222 to transmit rotational force; It is provided in the shape of a tubular accommodating the rotation shaft 222, one or more air inlet holes (224a) through which the external air on the water surface is introduced in the upper outer circumferential surface; is formed, and an air discharge hole (224b) is formed at the lower end, Consisting of a fluid circulation pipe 224 having an inner diameter decreasing from the top to the bottom, air is introduced into the air inlet hole 224a while the pressure at the rear of the impeller 221 decreases, and the air discharge hole The air discharged to (224b) forms microbubbles and is mixed with the oil-water mixture accommodated in the water tank 110 to aeration.

The impeller 221 is rotated by receiving a rotational force from the electric motor 223 to artificially control a fluid flow direction to generate a one-way flow.In the present invention, external air is converted into microbubbles and an oil-water mixture is It is used to transfer to the inner direction of the water tank 110 to be accommodated.

Water is sedimented and separated by the difference in specific gravity between oil and water constituting the oil-water mixture inside the water tank 110, and the oil can be separated by floating, but it takes a lot of time to separate each fluid phase only by the difference in specific gravity, so separation efficiency This is degraded. Therefore, if microbubbles are generated in the oil-water mixture, the floatation and separation of the oil can proceed quickly. Therefore, in consideration of the composition and physical properties of the oil in the oil-water mixture, the paddle type, propeller type, and turbine type impeller It is preferable to select any one of them to allow efficient air inflow to generate microbubbles. More specifically, the discharge flow rate is lower than that of the paddle type impeller, but in situations where a large shear stress is required, a turbine type impeller is used, but the blade provided in the impeller is divided up and down. It is preferable that any one of a dual pitched turbine-type impeller provided in a 45° rotated shape, and a concave turbine-type impeller provided in a semi-cylindrical shape of a blade is selected.

The upper end of the rotation shaft 222 is coupled to the electric motor 223, and the lower end is coupled to the impeller 221, and serves as an intermediate medium transmitting the rotational force of the electric motor 223 to the impeller 221. . Depending on the height of the water tank 110, the length of the rotation shaft 222 can be extended or reduced, and accordingly, the length of the fluid circulation pipe 224 is also provided to be extended or reduced, so that the aeration is optimized for the height of the water tank 110. Means 220 can be implemented.

The fluid circulation pipe 224 is provided in a tubular shape accommodating the rotation shaft 222, and the inner diameter of the fluid circulation pipe 224 is formed larger than the outer diameter of the rotation shaft 222. While provided on the outer circumferential portion, an annular space is formed as much as a difference between the outer diameter of the rotation shaft 222 and the inner diameter of the fluid circulation pipe 224 to secure a flow path through which external air can be introduced and transported. And the upper part (C2) of the fluid circulation pipe 224 is fixed to the electric motor flange coupling part (C1) of the electric motor 223, and the lower part is provided to be fitted to the rotation shaft 222 at the rear adjacent to the impeller 221 do.

In addition, at least one air inlet hole 224a through which external air is introduced is formed on the upper outer circumferential surface of the fluid circulation pipe 224, and at least one air discharge hole 224b is formed along the outer circumferential surface of the rotation shaft 222 on the lower surface. . In this configuration, when the rotational force of the electric motor 223 is transmitted to the impeller 221 through the rotation shaft 222, a pressure drop occurs at the rear of the impeller 221, so that the air inlet hole 224a Air is introduced and the air moves through the annular space formed by a difference between the outer diameter of the rotation shaft 222 and the inner diameter of the fluid circulation pipe 224 so that the air is discharged into the air discharge hole 224b. Here, a width pipe through hole 210a is formed at a position corresponding to the air inlet hole 224a on the outer circumferential surface of the aeration housing 210 so that air is smoothly introduced into the air inlet hole 224a.

Among the constituent elements of the aeration generator 200, the aeration activator 230 is provided inside the water tank 110 with a certain distance D2 from the lower end of the aeration housing 210, as shown in FIG. A detailed configuration and a coupling relationship will be described in detail with reference to FIG. 4 as follows.

The upper structure (B1) of the aeration activator 230 is provided to be inclined at the same angle as the inclination angle at which the aeration means 220 is provided, but is provided in a form in which the impeller 221 is inserted, The lower structure (B2) is formed with a plurality of rectangular mixing active holes (220a) for activating the mixing of the polyphase fluid and microbubbles. In more detail, the lower part of the impeller 221 inserted into the aeration housing 210 that is penetrated to the upper one side of the water tank 110 will be accommodated on one side of the inner circumference of the upper structure B1 of the aeration activator 220. It is characterized in that by providing a constant separation distance (D2) between the lowermost end of the aeration housing 210 and the uppermost end of the aeration activator 220 so that the flowing water mixture flows into the space formed by the separation distance (D2). do.

That is, as the pressure changes due to the rotation of the impeller 221, external air is introduced into the fluid circulation pipe 224 and discharged to the air discharge hole 224b, so that the multiphase fluid is also formed in the space formed at the separation distance D2. It is characterized in that it is possible to shorten the time for microbubbles to be dispersed into the oil-water mixture by allowing it to flow in. In addition, since the fine bubbles are better dispersed into the oil-water mixture through the mixed activating hole 230a provided in the lower part of the aeration activator 230, the floatation separation of the oil is well performed, thereby increasing the oil separation efficiency. have.

The configuration and coupling relationship of the aeration activator 230 will be described in detail with reference to FIGS. 4 to 6 as follows.

In order to fix the aeration activator 230 inside the water tank 110, it is preferable to provide a fixing guide 231 on one side of the upper side of the aeration activator 230 and bond it to the inner circumferential surface of the water tank 110. In more detail, since the upper portion of the aeration activator 230 is provided in an inclined manner, it is preferable to provide the fixing guide 231 in the obliquely bent portion (S) of the aeration activator 230 in order to secure structural stability. .

In addition, in order to more stably fix the aeration activator 230, an auxiliary plate 233 is further provided at the lower end of the aeration activator 230, and an auxiliary fixing guide 232 is coupled to the auxiliary plate 233 to fix the auxiliary fixing unit. It is preferable to bond the guide 232 to the inner circumferential surface of the water tank 110. In addition, in order to further secure structural stability, it is more preferable that the fixing guide 231 and the auxiliary fixing guide 232 be provided in a form orthogonal to each other on a plane.

That is, the above-described configuration is provided with a fixing guide 231 in the obliquely curved portion (S) formed in the upper structure (B1) of the aeration activator 230 to fix it with one side of the inner circumferential surface of the water tank 110, and the aeration An auxiliary plate 233 is further formed at the lower end of the lower structure B2 of the activator 230 to further fix one side of the auxiliary plate 233 and one side of the inner circumferential surface of the water tank 110 with an auxiliary fixing guide 232. .

The detailed description of the oil-water separation unit 300 composed of the solids screen 310, the oil-water inlet 320, and the oil outlet 330 and the coupling relationship between each component are as follows.

A solids screen 310 is formed at the top of the aeration reaction unit 100, and an oil separation tank 340 is provided to accommodate the solids screen 310 and connected to the oil water inlet 320 and the oil discharge port 330. . Here, a receiving chamber (B) in which the oil bubbles can be accommodated is formed in the oil separation tank 340, and the shape of the oil separation tank 340 is provided in any one of a truncated cone or a square truncated cone. It is desirable to be. And the solids screen 310 is formed by either a grid net or a porous filter, and the central portion of the solids screen 310 is formed such that an area corresponding to the diameter of the oil outlet 330 is closed to accommodate the oil bubbles. It is preferable to be configured to be discharged through the oil outlet 330 after being filled in the seal (B).

The configuration and functions of the solids screen 310 will be described in detail with reference to FIGS. 5 to 6 as follows. In order to efficiently filter the solids of the oil-water mixture containing solids and efficiently manage the solids accumulated in the solids screen 310, the solids screen 310 is spaced at a constant distance in the vertical lower direction of the oil outlet 330 Doedoe provided with a distance D1, it is preferable to be provided in a form to be seated on a plurality of locking projections 311 formed along the upper inner circumferential surface of the water tank 110 to facilitate maintenance.

In addition, the solids screen 310 is preferably provided in a form that allows a plurality of through holes to be formed, or can be replaced with one of a porous filter disk or a sieve according to the particle size distribution, hardness, and floating shape of the solids.

In addition, for the efficient management of the solids screen 310, the oil-water inlet 320 flows into an oil-water mixture containing solids, and does not include the first oil-water inlet 321 connected to the oil separation tank 340 and the solids. It is preferable that the oil-water mixture is divided into a second oil-water inlet 322 into which the oil-water mixture is introduced, and the second oil-water inlet 322 may be provided in a form that is directly connected to the water tank 110. Through this, the oil-water separation operation of an oil-water mixture that does not contain solids can be more efficiently performed.

Here, the first oil-water inlet 321 is a contact area between the oil-water mixture and the solids screen 310 including solids flowing into the first oil-water inlet 321 by obliquely connecting to one side of the side of the oil separation tank 340 It is more preferable to be provided with this increased inclination angle. Through this, it is possible to prevent a phenomenon in which the solid matter accumulates only on one side of the upper portion of the solid material screen 310 and thus impairs fluidity.

In addition, when the temperature of the surrounding environment is high, the oil inlet 320 has no problem with fluidity because the viscosity of the oil is lowered, but when the temperature of the surrounding environment is lowered, the viscosity of the oil increases and the fluidity inside the pipe may decrease rapidly. It is preferable that a heating means (not shown) such as a heating jacket is further provided at the outer periphery of the oil-water inlet 320 to secure the fluidity of the oil-water mixture.

As described above, when the oil is floated and separated by the fine bubbles generated in the aeration unit 220, the oil bubbles are filled in the receiving chamber B formed in the oil separation tank 340, and the oil discharge port 330 is closed. In this process, the oil outlet 330 also increases the viscosity of the oil when the temperature of the surrounding environment decreases, and the fluidity in the pipe rapidly decreases, and the oil solidifies, causing a clogging phenomenon in the pipe. Therefore, in order to prevent this in advance, it is preferable that the same heating means (not shown) such as the heating jacket may be further provided.

Although it has been described with reference to the drawings according to an embodiment of the present invention, it is possible for a person of ordinary skill in the art to perform various applications, modifications, and adaptations within the scope of the present invention based on the above contents. will be. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100: aeration reaction section
110: water tank 120: water outlet
130: observation window 140: level gauge
200: aeration generator
210: aeration housing 210a: explosive pipe through hole
220: aeration means 221: impeller
222: rotating shaft 223: electric motor
224: fluid circulation pipe 224a: air inlet hole
224b: air discharge hole 230: aeration activator
230a: mixed active hole 231: fixed guide
232: auxiliary fixing guide 233: auxiliary plate
300: oil-water separation unit
310: solids screen 311: locking jaw
320: flowing water inlet 321: first flowing water inlet
322: second oil inlet 330: oil outlet
340: oil separation tank

Claims (11)

In an oil-water separation device for separating water and oil components of an oil-water mixture,
An aeration reaction unit 100 consisting of a cylindrical water tank 110 and a water outlet 120 provided at one side of the lower end of the water tank 110;
The aeration housing 210 passing through the upper one side of the aeration reaction unit 100, the aeration means 220 inserted into the aeration housing 210, the lower end of the aeration housing 210 and a certain distance (D2) It consists of; an aeration generator 200 consisting of an aeration activator 230 provided inside the water tank 110,
A solids screen 310 is formed on the upper part of the aeration reaction unit 100 and is composed of an oil separation tank 340 in which the water inlet 320 and the oil outlet 330 are connected while accommodating the solids screen 310. Oil-water separation unit 300; is further provided,
The solids contained in the oil-water mixture are filtered and accumulated by the solids screen 310, and the oil bubbles floated by the microbubbles generated in the aeration means 220 pass through the solids screen 310, and accumulate. Oil-water separation device, characterized in that discharged through the oil outlet (330) together with the solid. The method of claim 1,
The oil separation tank 340 is provided with a receiving chamber (B) in which the oil bubbles can be accommodated, and the oil separation tank 340 has a shape of either a truncated cone or a square truncated cone. Oil-water separation device characterized by. The method of claim 1,
The solids screen 310 is formed by either a lattice net or a porous filter, and the central portion of the solids screen 310 is formed such that an area corresponding to the diameter of the oil outlet 330 is blocked, so that the oil bubbles are contained in the accommodation chamber. Oil-water separation device, characterized in that after being filled in (B) and discharged through the oil outlet (330). The method of claim 1,
The aeration reaction unit 100 includes an observation window 130 provided at one side of the upper end of the water tank 110 and an oil-water mixture accommodated in the water tank 110 to observe the internal state of the water tank 110. Oil-water separation device, characterized in that further provided with a level gauge (140) provided at one side of the lower end of the water tank (110) to check the water level change. The method of claim 1,
The oil-water inlet 320 is a first oil-water inlet 321 connected to the oil-separating tank 340 and a second oil-water inlet 322 through which an oil-water mixture containing solids flows in. And the second oil-water inlet 322 may be provided in a form that is directly connected to the water tank 110. The method of claim 5,
The first oil-water inlet 321 is obliquely connected to one side of the side of the oil separation tank 340 and has a contact area between the oil-water mixture and the solids screen 310 containing solids flowing into the first oil-water inlet 321 Oil-water separation device, characterized in that provided with an increased inclination angle. The method of claim 1,
The solids screen 310 is provided with a certain distance (D1) in the direction directly under the oil outlet 330,
Oil-water separation device, characterized in that it is provided in a form to be seated on the locking jaw 311 formed on one side of the upper end of the inner peripheral portion of the water tank 110. The method of claim 1,
The aeration means 220 is an impeller 221 that generates shear stress in the oil-water mixture, a rotation shaft 222 coupled with the impeller 221, and an electric motor 223 coupled with the rotation shaft 222 to transmit rotational force. , It is provided in a tubular shape accommodating the rotation shaft 222, the upper outer circumferential surface is formed with one or more air inlet holes (224a) through which external air on the water surface is introduced, and an air discharge hole (224b) is formed at the lower end, and from the top Oil-water separation device, characterized in that consisting of a fluid circulation pipe (224) having a shape that decreases the inner diameter in the lower direction. The method of claim 1,
On the outer circumferential surface of the aeration housing 210, a width pipe through hole 210a is formed at a position corresponding to the air inlet hole 224a formed in the fluid circulation pipe 224, so that external air flows into the air inlet hole 224a. Oil-water separation device, characterized in that to be. The method of claim 1,
The aeration activator 230 is provided with a certain distance D2 from the lowermost end of the aeration housing 210,
The upper structure (B1) of the aeration activator 230 is formed to be inclined at the same angle as the inclination angle into which the aeration means 220 is inserted into the aeration housing 210, and is provided in a form in which an impeller 311 is inserted. ,
The lower structure (B2) of the aeration activator (230) is an oil-water separation device, characterized in that a plurality of rectangular mixing activating holes (230a) for activating the mixing of the oil-water mixture and microbubbles are formed. The method of claim 1,
A fixing guide 231 is provided in the obliquely curved portion (S) formed in the upper structure (B1) of the aeration activator 230 to be bonded to one side of the inner circumferential surface of the water tank 110,
An auxiliary plate 233 is further bonded to the lower surface of the lower structure B2 of the aeration activator 230 to further fix one side of the auxiliary plate 233 and one side of the inner circumferential surface of the water tank 110 with an auxiliary fixing guide 232 Flowing water portion device, characterized in that to let.

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