WO2023090649A2

WO2023090649A2 - Device for separating mixed solution

Info

Publication number: WO2023090649A2
Application number: PCT/KR2022/015473
Authority: WO
Inventors: 장섭근
Original assignee: 장섭근
Priority date: 2021-11-22
Filing date: 2022-10-13
Publication date: 2023-05-25
Also published as: WO2023090649A3

Abstract

The present invention relates to a device for separating a mixed solution, the device comprising: a separation tank into which the mixed solution of a first liquid having a high specific gravity and a second liquid having a low specific gravity is input from one side; a first outlet and a second outlet provided on the other side of the separation tank, the first outlet being positioned lower than the second outlet; a water level measurement unit for measuring a first water level corresponding to the height of an interface formed in the mixed solution due to the specific gravity difference between the first liquid and the second liquid; a first valve and a second valve which operate the opening and closing of the first outlet and the second outlet, respectively; and a control unit for controlling the first valve and the second valve on the basis of signals received from the water level measurement unit. The control unit controls the first outlet to open only when the first water level is within a preset first range and controls the second outlet to open only when the first water level is within a preset second range.

Description

Mixed liquid separator

The present invention relates to an apparatus for separating a mixture of liquids having different specific gravity by specific gravity through a physical method.

Wastewater, which is a mixture of several liquids with different specific gravity, for example, oil and water, is discharged in large quantities not only from industrial sites such as factories, construction sites, and ships, but also from real life such as restaurants and homes.

If the mixed solution is discharged as it is without separate treatment, it often causes great damage to the natural ecosystem, so a pre-treatment process is required before discharging various mixed solutions into nature.

Examples of methods for separating liquids before mixing in mixed liquids having different specific gravity include specific gravity treatment, hydraulic separation, filter separation, and the like.

As a specific gravity separation method, for example, a method using a specific gravity difference, such as suspending oil on water for a mixture of water and oil and then removing it by skimming with an oil skimmer. However, the specific gravity separation method can be applied only to large-scale facilities such as sewage treatment plants that can create stagnation or slow flow in the mixed pressure core flow as installation space and power are required to float liquids with low specific gravity and operate the skimmer. The downside is that it is somewhat inconvenient.

The hydraulic separation method is a method of separating by centrifugal force and gravity by forming a specific flow pattern such as a vortex in a limited space. However, the hydraulic separation method has a fundamental limitation that complete separation is difficult because it is a method of sucking and removing the low specific gravity liquid suspended at the top.

The filter separation method is a method of filtering one kind of liquid using a filter cloth such as non-woven fabric and passing the remaining liquid. However, the filter separation method has a problem in that, when the amount of liquid to be filtered is large, it may leak out without being filtered out, and since filter replacement or cleaning is required regularly, maintenance costs are high and continuous separation treatment is difficult.

[Prior art literature]

(Patent Document 1) Korean Patent Registration No. 10-1726402 (registered on April 6, 2017)

An object of the present invention is to provide a liquid mixture separator capable of separating liquid mixtures of different specific gravities by specific gravity, having a simple structure, simple maintenance, and continuously processing a large amount of liquid mixture.

However, the technical problem to be solved by the present invention is not limited to the above problem, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.

The present invention relates to a mixed liquid separation device, comprising: a separation tank into which a mixture of a high specific gravity first liquid and a low specific gravity second liquid is injected into one side; A first outlet disposed in and a second outlet disposed upward; and a water level measurement unit for measuring a first water level corresponding to the height of an interface formed by the difference in specific gravity between the first liquid and the second liquid in the mixed liquid. ; And, a first valve for manipulating the opening and closing of the first outlet and a second valve for manipulating the opening and closing of the second outlet; and a control unit controlling the first valve and the second valve based on a signal received from the water level measurement unit, wherein the control unit controls the first water level only when the first water level is within a preset first range. Control to open the outlet is performed, and control to open the second outlet is performed only when the first water level is within a preset second range.

Here, the first range may be set to a range in which the first water level is greater than or equal to a first boundary water level set between the first outlet and the second outlet.

Accordingly, the control unit may perform control to switch the closed state of the first valve into an open state when the first water level reaches a position obtained by adding a first clearance height above the first boundary water level.

The second range may be set to a range in which the first water level is less than or equal to a second boundary water level set between the second outlet and the first boundary water level.

Accordingly, the control unit may perform control to switch the closed state of the second valve to an open state when the first water level reaches a position obtained by subtracting the second clearance height above the second boundary water level.

On the other hand, in one embodiment of the present invention, the level measuring unit is an interface located on the interface between the first liquid and the second liquid by being made of an intermediate specific gravity between the specific gravity of the first liquid and the specific gravity of the second liquid. A floating body is provided, and the interface floating body provides a reference for the first water level between the bottom and the interface.

If necessary, the water level measurement unit may include a floating body having a specific gravity lighter than that of the second liquid, and the floating body may provide a standard for the total water level between the bottom and the liquid surface.

And, according to an embodiment of the present invention, the second outlet may be a fixed second outlet having a fixed distance from the first outlet, or a movable second outlet having a variable distance from the first outlet. can

In the movable second outlet, an inlet into which the second liquid flows is located on the surface of the second liquid, and an outlet through which the inflowed second liquid flows out is connected to the inlet through a pipe member and extends outside the separation tank. can

Here, the movable second outlet may be a floating type having a specific gravity lighter than that of the second liquid, or a power driving type that moves under the control of the controller based on the total water level measured by the water level measuring unit. can

Also, the height of the outlet of the movable second discharge port is less than the first water level, and accordingly, the second liquid may be discharged through the outlet by the water head formed by the second liquid.

On the other hand, according to another embodiment of the present invention, in the second range, the first water level is less than or equal to the second boundary water level set between the second discharge port and the first boundary water level, and at the same time, the entire water level is upward toward the second outlet. It may be set to be a range equal to or greater than the set third boundary water level.

Accordingly, the control unit, when the first water level reaches a position obtained by subtracting the second marginal height above the second boundary water level, and at the same time, the entire water level reaches a position obtained by adding the third marginal height to the third boundary water level It is possible to perform control to convert the closed state of the second valve into an open state.

The liquid mixture separator of the present invention having the configuration as described above can rapidly and continuously separate liquid mixtures in which liquids having different specific gravity are mixed by specific gravity. In particular, since liquids having different specific gravities are simultaneously separated and discharged, the separation throughput per hour is very high.

In addition, since the mixed liquid separator of the present invention has a simple structure and almost no consumables, maintenance costs are greatly reduced. Therefore, since the investment cost is not an obstacle even when configuring large facilities, it is possible to promote the expansion of facilities for treating various wastewater.

In addition, if the mixed liquid separation device of the present invention is expanded to a ship structure or provided as an independent device on a ship, it can be used as a skimming vessel for recovering oil such as crude oil spilled into fresh water or seawater, and its effectiveness is very high.

However, the technical effects obtainable through the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical idea of the present invention, the present invention is the details described in such drawings should not be construed as limited to

1 is a view showing the overall configuration of a mixed liquid separator according to an embodiment of the present invention.

Fig. 2 shows an embodiment for a first range set for a first outlet;

Fig. 3 shows an embodiment of a second range set for a second outlet;

4 is a view showing a water level measuring unit according to an embodiment of the present invention.

Fig. 5 shows an example of a movable second outlet with a variable distance to the first outlet;

6 is a view showing another embodiment of controlling the opening and closing of the second valve according to the total water level.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined. Terms used in this specification are for describing embodiments and are not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase.

As used herein, "comprises" and/or "comprising" means that a stated component, step, operation, and/or element is one or more other components, steps, operations, and/or elements. Existence or additions are not excluded.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 shows the overall configuration of a mixed liquid separator 10 according to the present invention.

Referring to FIG. 1, the mixed liquid separator 10 of the present invention includes a separation water tank 100, a first outlet 200 and a second outlet 300, a water level measuring unit 400, and a control unit 500. do.

The separation tank 100 is a container into which the mixed liquid ML is injected, and the mixed liquid ML injected into one side of the separation water tank 100 includes a first liquid L1 of high specific gravity and a second liquid L2 of low specific gravity. is a liquid mixed with The size of the separation water tank 100 is made to an appropriate size according to the purpose of the mixed liquid separation device 10, and may have a lid if necessary. can be determined

For reference, the present invention is for separating a mixed liquid (ML) in which a first liquid (L1) of high specific gravity and a second liquid (L2) of low specific gravity are mixed into a first liquid (L1) and a second liquid (L2). , Each component to be described below, in order to help the understanding of the invention, those mainly related to the first liquid (L1) are referred to as “first to”, and those mainly related to the second liquid (L2) are referred to as “second to”. " will be referred to as

The first outlet 200 and the second outlet 300 are disposed on the other side of the separating water tank 100 . The first outlet 200 forms a passage through which the first liquid L1 is discharged. Since the first liquid L1 having a relatively high specific gravity gathers at the bottom of the separation water tank 100, the first outlet 200 is placed underneath In addition, the second outlet 300 forming a discharge passage for the second liquid L2 of low specific gravity is disposed above the first outlet 200 along the height direction.

However, the fact that the second outlet 300 is disposed above the first outlet 200 in the height direction only specifies the vertical positional relationship, and the first outlet 200 and the second outlet 300 are aligned in a vertical direction. That doesn't mean it's on top.

Here, the fact that the first outlet 200 and the second outlet 300 are disposed on the other side of the separation tank 100 means that they are spaced apart by an appropriate distance from the input of the mixed liquid ML to one side of the separation tank 100. meaning is implied. That is, in the first outlet 200 and the second outlet 300, the mixed liquid ML injected into one side of the separation water tank 100 has a clear difference between the first liquid L1 and the second liquid L2 due to the difference in specific gravity. They need to be separated by a sufficient distance to form the interface FC.

In addition, shock generated when the mixed liquid ML is introduced into the separation tank 100 is prevented from causing disturbance around the first outlet 200 and the second outlet 300, and the first liquid L1 and the second outlet 300 are prevented. In order to control the flow rate of the two liquids (L2) and induce the rapid separation of the first liquid (L1) and the second liquid (L2) up and down, it is also preferable that the flow control plate 110 is provided at an appropriate location and depth. can do.

The water level measuring unit 400 is a component corresponding to a water level sensor that measures the height of the interface FC formed by the first liquid L1 and the second liquid L2 layered up and down due to the difference in specific gravity. A specific embodiment of the water level measuring unit 400 will be described in detail in a corresponding section. To summarize its basic function, the water level measuring unit 400 is the height between the interface FC with respect to the floor FL, that is, the It serves to measure the first water level (LV1), which is the level of one liquid (L1). Here, the water level measuring unit 400 should be disposed in a region where the liquid mixture ML is separated into the first liquid L1 and the second liquid L2 by the difference in specific gravity to form an interface FC stably. am.

The first outlet 200 and the second outlet 300 are provided with a first valve 210 and a second valve 310 responsible for opening and closing, respectively. The opening and closing of the first valve 210 is appropriately controlled to prevent the second liquid L2 other than the first liquid L1 from being discharged through the first outlet 200, and similarly, the second valve 310 The first liquid L1 is prevented from being discharged through the second outlet 300 . The operation of the first valve 210 and the second valve 310 is performed by the control unit 500 .

The control unit 500 controls the operation of the first valve 210 and the second valve 310 based on the signal received from the water level measuring unit 400 . Specifically, the control unit 500 performs control to open the first outlet 200 only when the first water level LV1 is within the first range 510 set in advance, and also when the first water level LV1 is within the first range 510. Control to open the second outlet 300 is performed only when it is within the preset second range 520 . That is, the first range 510 defines a range in which the first liquid L1 can be specified as existing around the first outlet 200 .

In addition, since the first pump 220 and the second pump 320 are provided at the first outlet 200 and the second outlet 300, respectively, the first liquid L1 and the second liquid (L1) are provided much more quickly than natural discharge. L2) may be discharged to the outside. The operation of the first pump 220 and the second pump 320 may be interlocked with the opening operation of the first valve 210 and the second valve 310 under the control of the control unit 500 .

FIG. 2 shows a specific embodiment of the first range 510 set for the first outlet 200 . Referring to FIG. 2 , the first range 510 is a first water level LV1, that is, the level of the first liquid L1 from the floor FL to the interface FC is the first outlet 200 and the second It may be set to a range equal to or higher than the first boundary water level 512 set between the outlets 300.

In other words, the first range 510 means a range in which the first liquid L1 maintains a certain water level above the first outlet 200, and is equal to or higher than the first boundary water level 512 set as a safety value. When the first water level (LV1) is maintained, the first valve 210 is opened, otherwise, the first valve 210 is closed to prevent the second liquid (L2) from flowing out through the first outlet 200. prevent in advance

Furthermore, when the first water level (LV1) falls below the first boundary water level 512 and then rises again, the control unit 500 is located at a position obtained by adding the first marginal height 514 to the first boundary water level 512. The control of switching the closed state of the first valve 210 to the open state may be performed only when the first water level LV1 is reached. This is in consideration of the problem that the first valve 210 repeatedly opens and closes when the first water level LV1 goes up and down the first boundary water level 512 .

And, FIG. 3 shows a specific embodiment of the second range 520 set for the second outlet 300 . As shown, the second range 520 may be set to a range in which the first water level LV1 is equal to or less than the second boundary water level 522 set between the second outlet 300 and the first boundary water level 512. . The first water level (LV1) is the height from the floor (FL) to the interface (FC), the first water level (LV1) means the level of the first liquid (L1) and the bottom surface of the second liquid (L2) at the same time. do.

The second boundary water level 522 shown in FIG. 3 is also a kind of safety value, the minimum depth of the second liquid L2 to be secured below the second outlet 300, in other words, the first liquid L1. This means the maximum height that the second outlet 300 can allow. That is, when the first liquid L1 approaches the second outlet 300 by exceeding the second boundary water level 522, the risk of the first liquid L1 leaking through the second outlet 300 increases. Since it is in , the second boundary water level 522 becomes a standard for the opening and closing operation of the second valve 310 .

In addition, the controller 500 changes the second valve 310 from the closed state to the open state only when the first water level LV1 reaches a position obtained by subtracting the second clearance height 524 from the second boundary water level 522. Switching control can be performed. This is for the same reason as in the case of the first clearance height 514 described above, and prevents the frequent opening and closing of the second valve 310 when the first water level LV1 goes up and down the second boundary water level 522. is to do

4 shows a water level measuring unit 400 according to an embodiment of the present invention. The illustrated water level measuring unit 400 includes an interface floating body 410 having an intermediate specific gravity between the specific gravity of the first liquid L1 and the specific gravity of the second liquid L2. Since the interface floating body 410 has an intermediate specific gravity between the first liquid L1 and the second liquid L2, it is located on the interface FC between the first liquid L1 and the second liquid L2. Accordingly, the interface floating body 410 provides a reference for the first water level LV1 between the floor FL and the interface FC.

Since the interface floating body 410 is located on the interface FC between the first liquid L1 and the second liquid L2, by using the interface floating body 410, the interface between the bottom FL and the interface FC is formed. The first water level LV1 may be measured. The distance from a certain point (eg, the bottom of the separation tank) to the interface floating body 410 can be measured using a distance sensor of various known methods.

For example, a distance sensor disposed on the floor FL of the separation tank 100 or above the separation tank 100 (eg, the lid of the separation tank or the ceiling of the room) is attached to the interface floating body 410. By projecting, the distance from the floor FL or lid to the interface floating body 410 can be grasped.

Alternatively, as shown in FIG. 4, the interface floating body 410 moves freely up and down along the rod 430 or rail fixed to the bottom FL of the separation tank 100 according to the fluctuation of the interface FC, and in this way The position of the ascending and descending interface floating object 410 can be easily measured using a proximity sensor using light or ultrasonic waves, a hall sensor that responds to a magnetic field, or the like. For reference, sensors such as a known proximity sensor or a distance sensor are omitted in FIG. 4 in order to avoid limiting interpretation of the technical content of the present invention by the measurement method of the sensor.

Meanwhile, in the mixed liquid separator 10 of the present invention, the second discharge port 300 may be configured as a fixed type as well as a movable one. 1 to 4 show an example composed of a fixed second outlet 301 whose distance to the first outlet 200 is determined as a constant, and FIG. 5 shows an example in which the distance to the first outlet 200 is An example of a variable, movable second outlet 302 is shown.

Referring to FIG. 5, in the movable second outlet 302, the inlet 303 through which the second liquid L2 is introduced is located on the surface of the second liquid L2, and the introduced second liquid L2 is The outflow outlet 304 is connected to the inlet 303 through the pipe member 305 and extends outside the separation tank 100. Since the inlet 303 of the movable second outlet 302 is located on the surface of the second liquid L2, as in the case of the fixed second outlet 301, the surface of the second liquid L2 is the second outlet 300. ) is not below.

The movable second outlet 302 may be made of a floating type having a specific gravity lighter than that of the second liquid L2, or at the total level TL of the mixed liquid ML measured using a separate water level sensor. Based on the control unit 500, it may be configured as a power driving type that moves.

For example, in order to measure the total level TL of the mixed liquid ML, the level measuring unit 400 may include a floating body 420 having a specific gravity lighter than that of the second liquid L2. . The liquid surface floating body 420 can also only move up and down by the rod 430 or rail, etc., and the total water level TL between the liquid surface and the floor FL can be measured or calculated using the liquid surface floating body 420. . In addition, the inflow amount of the mixed liquid ML may be controlled so as not to flow excessively into the separation water tank 100 through the total water level TL measured or calculated through the floating body 420 . If the water level measuring unit 400 is equipped with the liquid surface floating body 420, it will be possible to share a sensor such as a proximity sensor or a distance sensor provided with the interface floating body 410 as an object to be inspected.

Depending on the embodiment, for the stable vertical movement of the movable second outlet 302, a transfer rail (not shown) may be installed vertically in the separation water tank 100 to induce vertical movement, and the transfer rail may be subject to technology. The movable second outlet 302 may be moved by installing an electric mechanism (for example, a chain mechanism) or a hydraulic mechanism belonging to .

Also, the height of the outlet 304 of the second movable outlet 302 may be less than the first water level LV1, for example, within the first range 510. This is to use the siphon effect, and the second liquid L2 can be continuously discharged through the power of the water head formed by the second liquid L2.

Using the siphon effect is possible because the movable second outlet 302 is always located on the surface of the second liquid L2, and in this case, the second pump 320 is not necessarily required (however, the second External power may be required for initial discharge of liquid). The embodiment using the siphon effect can be particularly useful when configuring the mixed liquid separation device 10 of the present invention in a compact size.

On the other hand, the above description has been made for a mixture of two liquids with different specific gravity, but by extending the operating principle of the present invention described in detail, it can be applied to a mixture of three or more liquids with different specific gravity. It will be obvious to those skilled in the art.

6 is a view showing a mixed liquid separator according to another embodiment of the present invention. The embodiment of FIG. 6 includes the configuration of the mixed liquid separator described with reference to FIGS. 1 to 5 as it is, and its technical feature is that it further includes a configuration for controlling the opening and closing of the second valve in consideration of the total water level. will be.

As described in FIG. 5, in order to measure the total level TL of the mixed liquid ML, the level measuring unit 400 is provided with a floating body 420 having a specific gravity lighter than that of the second liquid L2. can do. That is, the water level measurement unit 400 having the liquid surface floating body 420 may also provide a standard for the entire water level between the bottom and the liquid surface.

Referring to FIG. 6 , in addition to setting the first and second

boundary water levels

512 and 522, there is a difference from the embodiments of FIGS. 2 and 3 in that a third boundary water level 526 is additionally set.

As shown in FIG. 6, even if the first water level (LV1) is below the second boundary water level (522), when the amount of the second liquid (L2) is small, the surface of the second liquid (L2) is the second discharge port (300) may be below. In other words, in the case of FIG. 6, even if the second outlet 300 is opened, the second liquid L2 cannot be discharged. In this case, the second outlet 300 is opened and the second pump 320 ) need not be run.

Therefore, in another embodiment of FIG. 6, the second range 520 is equal to or less than the second boundary water level 522 in which the first water level LV1 is set between the second outlet 300 and the first boundary water level 512, and thus In addition, the total water level TL is set to two

boundary water levels

522 and 526, i.e., a range greater than or equal to the third boundary water level 526 set above the second outlet 300.

And, as the third boundary water level 526 is additionally set, the control unit 500 reaches a position where the first water level LV1 is obtained by subtracting the second marginal height 524 from the second boundary water level 522, At the same time, when the total water level (TL) reaches a position obtained by adding the third marginal height (528), which is a safety value, to the third boundary water level (526), control is performed to switch the closed state of the second valve 310 to the open state. can do.

As such, the embodiment of FIG. 6 utilizes the information on the total water level to open the second outlet 300 and open the second pump when the second liquid L2 sufficiently exists around the second outlet 300. By driving the 320, it is possible to more accurately and efficiently separate the mixed liquid.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

[Description of code]

10: Mixed liquid separator 100: Separation tank

110: flow control plate 200: first outlet

210: first valve 220: first pump

300: second outlet 301: fixed second outlet

302: movable second outlet 303: inlet

304: exit 305: pipe member

306: transfer rail 310: second valve

320: second pump 400: water level measuring unit

410: interface floating body 420: liquid surface floating body

430: load 500: control unit

510: first range 512: first boundary water level

514: first clearance height 520: second range

522: second boundary water level 524: second clearance height

526: 3rd boundary water level 528: 3rd clearance height

ML: mixed liquid L1: first liquid

L2: second liquid FC: interface

LV1: 1st water level LV2: 2nd water level

TL: full water level

The present invention can be usefully utilized as a device for separating a liquid mixture in which liquids having different specific gravity are mixed.

Claims

a separation tank into which a mixture of a first liquid with a high specific gravity and a second liquid with a low specific gravity is injected into one side;

a first outlet disposed on the other side of the separation tank and disposed downward along a height direction and a second discharge port disposed upward;

a water level measurement unit measuring a first water level corresponding to a height of an interface formed by a difference in specific gravity between the first liquid and the second liquid;

a first valve for opening and closing the first outlet and a second valve for opening and closing the second outlet; and

a control unit controlling the first valve and the second valve based on the signal received from the water level measuring unit;

including,

The control unit performs control to open the first outlet only when the first water level is within a preset first range, and opens the second outlet only when the first water level is within a preset second range. Mixed liquid separator, characterized in that for performing the control to open.
According to claim 1,

The first range is a range in which the first water level is greater than or equal to a first boundary water level set between the first outlet and the second outlet.
According to claim 2,

The mixed liquid separation device, characterized in that the controller switches the closed state of the first valve to an open state when the first water level reaches a position obtained by adding a first clearance height to the first boundary water level.
According to claim 1,

The second range is a range in which the first water level is less than or equal to a second boundary water level set between the second outlet and the first boundary water level.
According to claim 4,

The mixed-liquid separation device according to claim 1 , wherein the control unit switches the closed state of the second valve to an open state when the first water level reaches a position obtained by subtracting the second clearance height above the second boundary water level.
According to claim 1,

The water level measuring unit,

An interface floating body positioned on the interface between the first liquid and the second liquid by having an intermediate specific gravity between the specific gravity of the first liquid and the specific gravity of the second liquid,

The interface floating body provides a reference for the first water level between the bottom and the interface.
According to claim 6,

The water level measuring unit,

A liquid surface floating body made of a specific gravity lighter than the specific gravity of the second liquid,

The mixed liquid separation device, characterized in that the liquid surface floating body provides a reference for the total water level between the bottom and the liquid surface.
According to claim 1,

The second outlet,

Mixed liquid separator, characterized in that the fixed second outlet with a fixed distance to the first outlet, or a movable second outlet with a variable distance to the first outlet.
According to claim 8,

The movable second outlet,

An inlet into which the second liquid flows is located on a surface of the second liquid, and an outlet through which the inflowed second liquid flows out is connected to the inlet by a pipe member and extends outside the separation tank. .
According to claim 9,

The movable second outlet,

It is a floating type consisting of a specific gravity lighter than the specific gravity of the second liquid,

or a mixed liquid separator, characterized in that it is a power driving type that moves under the control of the controller based on the total water level measured by the water level measurement unit.
According to claim 9,

Mixed-liquid separation device, characterized in that the height of the outlet of the movable second outlet is less than the first water level, and accordingly, the second liquid is discharged to the outlet by the head formed by the second liquid.
According to claim 7,

The second range is characterized in that the first water level is less than or equal to the second boundary water level set between the second outlet and the first boundary water level, and at the same time, the entire water level is greater than or equal to the third boundary water level set above the second outlet. Mixed-liquid separator to do.
According to claim 12,

The controller controls the second boundary water level when the first water level reaches a position obtained by subtracting the second marginal height above the second boundary water level, and at the same time, the entire water level reaches a position obtained by adding the third marginal height to the third boundary water level. Mixed liquid separation device, characterized in that for switching the closed state of the valve to the open state.