JPH1028968A - Separator of oil and water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to recover a viscous oil component by fluidizing an original liquid in circulation and also efficiently performing a separation of oil and water under shutting off the original liquid from air. SOLUTION: The separator 1 is provided with an intake means 2 of a recovering original liquid, a separating tank 3 for a take-in original liquid and a water storage tank 4 connected with the separating tank 3. An oil component recovery pipe 17 is arranged in the separating tank 3 and the upper edge of it is provided with an opening 17 a in a little upper part than a liquid level of the original liquid is the separating tank 3 and a scraping means 22 moving along the liquid surface is provided at the position faced to the opening, and a circular induction means 8 for inducing a circulation flow of the original liquid in accordance with the fed original liquid is arranged at a start side of the separating tank 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water separation apparatus, and more particularly to an oil / water recovery apparatus excellent in recovering viscous oil.

[0002]

2. Description of the Related Art In general, it is necessary to treat oil-containing water in food factories, machinery factories, and the like. To solve this problem, various types of oil-water separators have been proposed and put to practical use. The separation method of these oil-water separation devices has been performed by separating oil and water up and down in a separation tank by a specific gravity difference. Then, the separated oil and water were respectively recovered through the recovery pipe.

[0003]

By the way, the viscous oil is included in the separated and suspended oil, and the viscous oil is collected near the opening at the upper part of the collecting pipe and collected. It was difficult.

The present invention solves the above-mentioned problems, and in particular, generates a swirling flow of a stock solution, and shuts off the swirling flow from air to efficiently separate oil and water, and is excellent in recovering viscous oil. It is an object of the present invention to propose an oil-water separation device.

[0005]

According to a first aspect of the present invention, there is provided an oil / water separating apparatus for separating an undiluted solution containing oil and water into oil and water by a specific gravity difference. An apparatus, wherein the separation device is provided with an intake means for the recovered stock solution, and a separation tank for the taken-in stock solution and a water storage tank continuous with the separation tank.
An oil recovery pipe is disposed in the separation tank, and the upper end thereof is opened slightly above the liquid surface of the undiluted liquid in the separation tank, and a scraping means moving along the liquid surface is provided at a position facing the opening. It is characterized by being provided.

An oil-water separator according to a second aspect of the present invention is a separator for separating an undiluted solution in which oil and water are mixed into oil and moisture by a difference in specific gravity. A separation tank for the raw solution taken in and a water storage tank continuous with the separation tank are provided, and an oil recovery pipe is arranged in the separation tank, and the upper end thereof is slightly above the liquid level of the stock solution in the separation tank. At the beginning of the separation tank, an arc-shaped guide means for causing a swirling flow in the undiluted solution is provided, and the separation tank has an inclined ceiling so that the downstream side in the flow direction of the undiluted solution is gradually increased. It is characterized by being attached.

Further, in the oil / water separation device according to a third aspect of the present invention, a plurality of arc-shaped guiding means for causing a swirling flow in the undiluted solution at the starting end side of the separation tank are provided so as to be opposed to each other by being displaced vertically. It is characterized by.

Further, the oil-water separation device according to claim 4 is
The inclined ceiling attached to the separation tank has a single-flow or double-flow roof shape.

An oil-water separator according to a fifth aspect of the present invention is a separator for separating an undiluted solution mixed with oil and water into an oil component and water by a difference in specific gravity. A separation tank for the raw solution taken in and a water storage tank connected to the separation tank are provided, and an oil recovery pipe is disposed in the separation tank, and the upper end thereof is slightly above the liquid level of the stock solution in the separation tank. Opening is provided at a position facing the opening, and a scraping means moving along the liquid surface is provided, and the unloading means for the undiluted solution removes the undiluted solution sent in a state where air is mixed or removes the mixed air. And sent to the separation tank.

According to a sixth aspect of the present invention, there is provided a separating apparatus for separating a stock solution mixed with oil and water into oil and water by a difference in specific gravity, wherein the separating device incorporates a means for taking in the recovered stock solution. A separation tank for the undiluted solution and a water storage tank continuous with the separation tank are provided, and an oil recovery pipe is arranged in the separation tank, and the upper end thereof is opened slightly above the liquid level of the undiluted solution in the separation tank. In the position facing the opening, a scraping means moving along the liquid surface is provided, and the separation tank or the water storage tank is provided with a whisker net formed of metal whiskers in a net shape. And

Further, according to the present invention, an adjusting plate for adjusting the liquid level inside the water storage tank and the separation tank is provided on the partition wall for partitioning the water storage tank and the drain tank. It is characterized by.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the drawings, reference numeral 1 denotes an oil / water separator according to the present invention. The oil / water separator 1 collects a stock solution mixed with oil / water discharged from a food factory, a machine factory, etc. (not shown). And separates it into oil and water using the difference in specific gravity.

The oil / water separator 1 has a stock solution taking-in means 2 for taking in the collected stock solution, a separation tank 3 for separating the stock solution taken in by the stock solution taking means 2, and a continuous water storage in the separation tank 3. A tank 4 and a drainage tank 5 connected to the water storage tank 4 are provided.

The undiluted solution intake means 2 is located at substantially the center of the separating device 1 near one longitudinal side, and a undiluted solution collecting pipe 6 is attached to a side portion thereof so as to protrude outside the separating device 1. As a tank structure, an inclined surface 2a is formed above the undiluted solution intake means 2 so that the undiluted solution flows vigorously into the separation tank 3 when overflowing, and one end of the inclined surface 2a is connected to the separation tank. 3 is higher than the liquid level 7 at the start end.

The separation tank 3 is positioned over the entire length from one longitudinal side to the other side of the separation device 1, and the end of the separation tank 3 is curved substantially in a U-shape in plan view and has a U-shape. The curved tip is adjacent to the undiluted liquid intake means 2. Also,
On the starting end side of the separation tank 3, the inclined surface 2a
A guide plate 8 which is curved in an arc shape corresponding to the stock solution flowing in from above is provided, and the stock solution is guided by the arc surface of the guide plate 8 and the corresponding side wall of the separation tank 3, and is indicated by an arrow in FIG. The swirling flow is generated as shown.

At the end of the separation tank 3, a scraping means described later is provided, and in the separation tank 3 near the scraping means, a partition 13 is provided. It is in a slightly lower position. An inclined ceiling 14 is provided on the upper part of the separation tank 3 except for the end on the terminal side. Since the undiluted liquid flows from the starting end side to the end side of the separation tank 3 on the inclined ceiling 14, the inclination is set so that the downstream side in the flowing direction gradually increases, and the removal by the buoyancy of the oil is guided by the inclination and smoothly. The inclined ceiling 14 has a single-flow roof shape (see FIG. 5) as viewed from the flow direction, and the floating oil is collected from the skirt portion to the top portion of the roof shape. In addition, the inclined ceiling 14 is provided with an inspection window 16 which is closed by a drop lid 15 at a position where the separation tank 3 is located immediately above the U-turn from one longitudinal side to the other side.

An oil recovery pipe 17 is disposed near the semicircular portion in plan view of the front end of the separation tank 3 at the end side where the inclined ceiling 14 is not provided, and the upper end of the oil recovery pipe 17 is slightly higher than the liquid level 7. An opening 17a is formed upward, and the lower end protrudes outside the separation tank 3. A horizontal plate member 18 is provided around the opening 17a, and a plate member 19 inclined downward is provided on both sides of the plate member 18.
The outer sides of the plate member 18 and the plate member 19 are curved so as to conform to the shape of the front end portion in the separation tank 3.

Next, the scum, viscous oil and the like floating on the liquid surface are raked over the opening 17a of the oil recovery pipe 17 while being moved along the liquid surface 7, and the oil is recovered by the oil recovery pipe 17. A scraping means for collecting is arranged. The scraping means is mounted on a mounting shaft 20 formed of a metal such as resin or stainless steel, a rotating shaft 21 fixed above the center of the mounting shaft 20, and supported by the mounting shaft 20 in a movable state. And a scraping plate 22 formed of a metal such as stainless steel. And the above-mentioned rotating shaft 2
1 is connected to the motor 23. Note that a brush, a cloth, or the like may be used instead of the scraping plate 22.

The water storage tank 4 is provided adjacent to the end of the separation tank 3, and the water storage tank 4 and the separation tank 3 are connected to each other.
Is an opening 24 formed in the lower part of the side wall on the terminal side of the separation tank 3.
Is continued by Further, a container 26 filled with a whisker net 25 in which whiskers (thin wires of 30 to 40 microns) made of metal such as stainless steel are formed in a net shape is disposed in the water storage tank 4. A hole 27 is formed. Further, an air pipe 28 having a large number of through-holes is disposed below the container 26.

The surface of the whisker is pickled, and the surface of the whisker is processed by roughening (roughening) to increase the surface area. The container 26 may be provided so as to be replaceable, or be capable of being cleaned by vibration.

The drainage tank 5 provided adjacent to the water storage tank 4 is separated from the water storage tank 4 by a partition wall 29, and a drain pipe 30 projecting to the outside is attached to the center bottom of the drainage tank 5. Have been. The partition wall 29 is moved up and down by a handle 31 or the like, so that the liquid level 7 of the water storage tank 4 is increased.
An adjustment plate 32 is provided to make the surface flush with the terminal liquid level of the separation tank 3. The level of the liquid in the separation tank 3 is deviated vertically depending on the amount of the undiluted solution collected by a collecting pump (not shown) sent to the undiluted solution intake means 2. At this time, the adjusting plate 32 is moved up and down. And make it correspond.

According to the oil / water separation apparatus 1 having the above-described structure, when the stock solution mixed with oil and water is supplied from the stock solution collecting pipe 6 to the stock solution intake means 2, the stock solution overflowing from the stock solution intake means 2 is inclined upward. The surface 2a flows toward the separation tank 3 on the starting end side. The undiluted solution that has flowed into the separation tank 3 is supplied to the corresponding guide plate 8.
2 and the side wall of the separation tank 3 corresponding to the arc surface, a swirling flow is generated as shown by an arrow in FIG. 2, and the swirling flow extends the flow distance to provide an opportunity for specific gravity difference separation. Since the oil content is increased, the oil content and the water content are effectively separated, the oil content rises, and the water content sinks.

The oil that has floated flows to the terminal side in the separation tank 3 along the slope without changing the state in which the inclined ceiling 14 of the separation tank 3 blocks air and the oil does not overflow due to vaporization. .

Since the water introduced to the end of the separation tank 3 still contains some oil, the specific gravity difference is further separated in this part, and the oil separated and floated here is separated from the water. The oil separated and floated on the start end side of the separation tank 3 is shut off from the air by the inclined ceiling 14 and guided to the vicinity of an oil recovery pipe 17 provided at the front end of the separation layer 3 on the end side.

Since scum, viscous oil, and the like are floating in the oil guided to the vicinity of the oil recovery pipe 17, when the motor 23 is operated to rotate the rotary shaft 21, the scraper 22 Also rotates, the scraping plate 22
The scum, viscous oil and the like are removed by the oil recovery pipe 1
7 is scraped up along the inclined plate member 19 provided in the upper end opening 17a and collected in the opening 17a.

In the above, the scum, viscous oil, etc., which are scraped up along the plate member 19 by the rotation of the scraping plate 22, try to escape outward in the outward direction. Wall surface 3e of a semicircular portion in plan view at the tip
Therefore, the oil collecting pipe 17 can be reliably guided to the upper end opening 17a by the scraping plate 22.

On the other hand, the moisture guided to the terminal side of the separation tank 3 is removed from the opening 2 formed in the lower part of the side wall on the terminal side of the first separation tank 3c.
4 flows into the water storage tank 4, and some of the oily particles are mixed in the inflowing water. When the particles come into contact with the fine wires of the whisker net 25, the particles adhere and grow due to the surface tension thereof, When the particles become coarse particles, they float up and are collected, and the water passes through as they are. As described above, since the oil component is also recovered by the whisker net 25, the oil / water separation efficiency is high.

The water passing through the whisker net 25 in the water storage tank 4 overflows the adjusting plate 32 of the partition wall 29, flows into the drainage tank 5, and is discharged from the drainage pipe 30 provided thereunder. By repeating such a separating operation, the oil and water are completely separated, and the oil is recovered.

Next, another embodiment of the oil-water separator according to the present invention will be described with reference to FIGS.

The oil-water separator 1 of this embodiment also has a means 2 for taking in the recovered stock solution, a separation tank 3 for the taken-in stock solution, and the separation tank 3.
And a drainage tank 5 continuous with the water storage tank 4 is provided. However, since the configurations of the undiluted solution intake means 2 and the separation tank 3 are different from those in the above-described example,
Hereinafter, this difference will be described, and the same reference numerals will be given to portions having the same configuration as the above-described example, and description thereof will be omitted.

The undiluted liquid intake means 2 is located above one side in the longitudinal direction of the separation device 1 and has a circular chamber 2b in plan view.
An undiluted solution intake pipe 2c is connected tangentially to the upper peripheral surface of the circular chamber 2b, and an undiluted solution delivery pipe 2h facing the beginning of the separation tank 3 is connected to the center of the bottom of the chamber 2b. In the cyclone structure, the inflow direction of the undiluted solution is directed at the lower end of the undiluted solution delivery pipe 2h toward the starting end side of the separation tank 3, that is, toward the arcuate guide plate 8 disposed in the first separation tank 3a. The portion 2e is attached so as to have a horizontal spread, and an air discharge port 2g which is closed by attaching a stopper 2f and opened by detachment is provided at the center of the top surface of the circular chamber 2b. ing.

In the above-mentioned stock solution taking means 2,
A raw liquid intake pipe 2c was tangentially connected from the outside to the upper peripheral surface of the circular chamber 2b.
As shown in FIG. 11, the separation tank 3a is pierced vertically from below, the upper part is inserted into the center of the circular chamber 2b, and the upper end is opened in the circular chamber 2b so as to generate a swirling flow of the stock solution. By providing a delivery pipe 2d having a larger diameter outside the intake pipe 2c, the undiluted solution is sucked from an intake section 34 of a pump 33 provided below the separation tank 3a, and the intake pipe 2c is drawn. To generate a swirling flow in the circular chamber 2b. In this case, the apparatus is compact and the piping is simplified.

The separation tank 3 uses a part except for a water storage tank 4 and a drainage tank 5 which are formed separately on one side in the longitudinal direction of the separation device 1. It is divided into a separation tank 3a, a second separation tank 3b, and a third separation tank 3c. The first separation tank 3a is provided with one arc-shaped guide plate 8 as shown in FIG. 9 corresponding to the stock solution flowing from the stock solution delivery pipe 2d of the stock solution intake means 2 as shown in FIG. 8 and the corresponding separation tank 3a
9 to generate a swirling flow as shown by the arrow in FIG. 9 or two arc-shaped guiding plates 8a and 8b with 8b below 8a as shown in FIG. The guide plates 8a and 8b are arranged so as to be opposed to each other with a displacement, and a swirling flow of the stock solution is caused as shown by an arrow in FIG. In the above-described example, a whisker net 25 provided in the water storage tank 4 is provided in the second separation tank 3b.

The partition 9 for partitioning the first separation tank 3a and the second separation tank 3b has an upper part located at a position slightly lower than the liquid level in this part and an opening 10 formed in the lower part. The partition 11 that separates the separation tank 3b and the third separation tank 3c also has an upper part at a position slightly lower than the liquid level in this part.
An opening 12 is formed in the lower part.

The separation tank 3 is provided with an inclined ceiling 14 at its upper part except for a third separation tank 3c. The slanted ceiling 14 allows the undiluted solution to flow from the first separation tank 3a to the second separation tank 3
b to the third separation tank 3c, the inclination is set so that the downstream side in the flow direction gradually becomes higher, so that oil buoyancy can be removed satisfactorily, and the flow of the inclined ceiling 14 The shape seen from the direction is a roof with two flows (see FIGS. 9 to 11) so that oil can be collected at the top.

In the oil / water separation device 1 having the above-described configuration, one of the arc-shaped guide plates 8 is provided. The air discharge port 2g provided on the top surface of the circular chamber 2b in the stock solution intake means 2 is opened. Then, when the undiluted solution containing a little air is mixed with the oil and water and sent from the intake pipe 2c, the undiluted solution is swirled along the peripheral wall of the circular chamber 2b, and the mixed air is discharged from the discharge port 2g and sent. It flows into the arc-shaped guide plate 8 in the first separation tank 3a from the pipe 2d. Then, the guide plate 8 guides the undiluted solution by its arc surface and the side wall of the separation tank 3a opposed thereto to cause a swirling flow of the undiluted solution as shown by an arrow in FIG. As a result, the chance of the specific gravity difference separation is increased, so that the oil and water are effectively separated, and the oil floats and the water sediments. The floated oil flows into the second separation tank 3b along the slope without changing to a state in which the inclined ceiling 13 of the separation tank 3 blocks the air to prevent overflow due to vaporization. 9 flows into the second separation part 3b from the lower opening part 10 of the second embodiment.

However, when the swirling flow of the undiluted solution is caused by the arc-shaped guide plate 8 and the wall of the separation tank 3a as described above, the swirl flow generated by the arc surface of the guide plate 8 is generated by the wall of the separation tank 3a. Because of the disturbance on the side, the turning state is irregular and tends to disappear quickly. Therefore, as shown in FIG. 10, if two arc-shaped guide plates 8a and 8b are provided to face each other with their positions shifted vertically, the undiluted solution guided by the arc surface of the first guide plate 8a to generate a swirling flow is Since the swirling flow is not similarly disturbed by the arc surface of the next guiding plate 8b, the undiluted liquid can maintain a regular swirling flow for a required time.

Since the water introduced into the second separation tank 3b still contains some oil, the specific gravity difference separation is continued, and the whisker net 25 is provided in the separation tank 3b. When the oily fine particles contained in the water come into contact with the fine wire when passing through the whisker net 25, the fine particles adhere to the fine wire by surface tension, and the adhered particles grow by the adhesion of the subsequent particles and float and are separated when they become coarse particles. Then, the separated oil is shut off from the air by the inclined ceiling 13 and flows into the third separation tank 3c by the water flow, and the water flows from the opening 12 into the third separation tank 3c.

Since scum, viscous oil, and the like are floating in the oil guided to the vicinity of the oil recovery pipe 17 of the third separation tank 3c, the motor 23 is operated to rotate the rotary shaft 21. Since the scraping plate 22 also rotates, the scum, viscous oil, and the like are inclined by the scraping plate 22 so that the inclined plate member 19 provided at the upper end opening 17a of the oil collecting pipe 17 is provided.
The water is collected by the opening 17a, flows over the adjusting plate 32 of the partition wall 29, flows into the drainage tank 5, and is discharged from the drainage pipe 30 provided thereunder. The oil and water are completely separated and the oil is recovered. Further, by moving the adjusting plate 32 up and down, the liquid level 7 between the water storage tank 4 and the separation tank 3c can be moved up and down and can be adjusted to the same level.

When the scum, viscous oil and the like are collected by the scraping plate 22, the scum,
The viscous oil or the like tends to escape outward, but is blocked by the wall surface 3e of the semicircular portion in plan view at the end of the separation tank 3 at the end, so that the oil collecting pipe is surely moved by the scraping plate 22. 17 can be guided to the upper end opening 17a.

Further, the air outlet 2g provided on the top surface of the circular chamber 2b of the undiluted solution intake means 2 is sealed with a stopper 35,
When a mixed stock solution of oil and water containing a large amount of scum, miscellaneous substances, etc. and containing air is sent from the intake pipe 2c, air is not discharged even if the stock solution swirls and flows along the peripheral wall of the circular chamber 2b. , Undiluted solution containing air 2d
Arc-shaped guide plate 8 provided in first separation tank 3a
The air mixed with the undiluted solution flows into the undiluted solution because it is guided by the guide plate 8 to generate a swirling flow. The removal of miscellaneous substances is performed efficiently, and in this case, the oil and water are separated in the same manner as described above.

[0043]

As described above, according to the first aspect of the present invention, the oil can be scraped up by the scraping plate and collected in the opening of the oil collecting pipe. Of course, solid impurities such as scum and miscellaneous substances mixed with the oil can also be collected.

According to the second aspect of the present invention, the undiluted solution is separated from the air in the specific gravity difference separation of the oil and water so that the floated oil can be prevented from changing to a state in which it is difficult to overflow due to vaporization. Further, the swirling flow of the stock solution is generated only by flowing the stock solution mixed with the oil and water into the separation tank, so that the chance of specific gravity difference separation is increased and the oil and water can be efficiently separated.

According to the third aspect of the present invention, the undiluted solution is continuously guided by the arc surface, so that a swirling flow having a regular and long duration can be generated. Further, the swirling flow of the stock solution is generated only by flowing the stock solution mixed with the oil and water into the separation tank, so that the chance of specific gravity difference separation is increased and the oil and water can be efficiently separated.
Furthermore, in the specific gravity difference separation of the oil and water, the undiluted solution can be shielded from the air so that the floated oil does not change to a state in which it is difficult to overflow due to vaporization.

According to the fourth aspect of the present invention, the separated oil can be easily collected and collected by the buoyancy at the high portion of the roof.

According to the fifth aspect of the present invention, when the undiluted solution is taken in, the air mixed in is removed to remove oil and water which are not affected by the air, or the separation operation is performed while the air is mixed to perform the air separation. By using the buoyancy of the scum, it is possible to effectively remove scum, foreign matters, and the like.

According to the sixth aspect of the present invention, the oily fine particles can be effectively adhered to and grown on the net in the separation tank or the water storage tank.

[Brief description of the drawings]

FIG. 1 is a plan view in which a part of an example of an oil-water separation device according to the present invention is omitted.

FIG. 2 is a rear view taken along a line AA in FIG. 1;

FIG. 3 is a front view taken along a line BB in FIG. 1;

FIG. 4 is a left side view in which a part of the oil / water separation device is broken.

FIG. 5 is a side view of the inclined ceiling section taken along the line CC of FIG. 1;

FIG. 6 is an explanatory diagram showing a relationship between an oil recovery pipe and a scraping means.

FIG. 7 is a plan view in which a part of another example of the oil / water separation device according to the present invention is omitted.

8 is a front view taken along line AA of FIG. 7;

9 is a right side view taken along line BB in FIG. 7;

10 is a vertical right side view of an example in which the stock solution taking-in means in FIG. 9 is partially changed.

11 is a vertical right side view of an example in which a plurality of arc-shaped guide plates in FIG. 9 are used.

FIG. 12 is a left side view in which a part of the oil / water separation device is broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation apparatus 2 Unloading means 3 Separation tank 4 Water storage tank 8 and 8a, 8b Arc-shaped guiding means 14 Inclined ceiling 17 Oil recovery pipe 22 Scrape means 25 Whisker net

Claims (7)

[Claims] 1. A separation device for separating a stock solution in which oil and water are mixed into oil and water according to a difference in specific gravity, wherein said separation device includes a means for taking in the recovered stock solution, a separating tank for taking in the stock solution, and A water storage tank that is continuous with the separation tank, and a drainage tank that is continuous with the water storage tank are provided. An oil recovery pipe is disposed in the separation tank, and the upper end of the oil recovery pipe is located above the liquid level of the undiluted solution in the separation tank. An oil / water separation device, wherein the oil / water separation device is opened slightly upward and provided with a scraping means moving along the liquid surface at a position facing the opening. 2. A separation device for separating a stock solution in which oil and water are mixed into oil and moisture according to a difference in specific gravity, wherein said separation device includes a means for taking in the recovered stock solution, a separation tank for the stock solution taken in, and A water storage tank connected to the separation tank and a drainage tank connected to the water storage tank are provided. An oil recovery pipe is arranged in the separation tank, and the upper end thereof is positioned above the liquid level of the undiluted liquid in the separation tank. It is opened slightly upward, and an arc-shaped guide means for causing a swirling flow in the undiluted solution is provided at the starting end of the separation tank, and the separation tank is inclined so that the downstream side in the flow direction of the undiluted solution gradually becomes higher. An oil / water separation device having a ceiling attached. 3. The method according to claim 1, wherein a plurality of arc-shaped guiding means for causing a swirling flow in the undiluted solution are provided at a starting end of the separation tank so as to be opposed to each other while being vertically displaced. 2. The oil-water separation device according to 2. 4. The oil / water separation device according to claim 2, wherein the inclined ceiling attached to the separation tank has a single-flow or double-flow roof shape. 5. A separation device for separating a stock solution in which oil and water are mixed into oil and water by a difference in specific gravity, wherein said separation device includes a means for taking in the recovered stock solution, a separating tank for taking in the stock solution, and A water storage tank that is continuous with the separation tank, and a drainage tank that is continuous with the water storage tank are provided. An oil recovery pipe is disposed in the separation tank, and the upper end of the oil recovery pipe is located above the liquid level of the undiluted solution in the separation tank. It is opened slightly upward, and a scraping means moving along the liquid surface is provided at a position facing the opening, and the undiluted liquid taking-in means is directly mixed with the undiluted liquid sent in a state where air is mixed. An oil-water separation device characterized in that it is configured to send air to a separation tank except for air. 6. A separation device for separating a stock solution in which oil and water are mixed into oil and water by a difference in specific gravity, wherein the separation device includes a means for taking in the recovered stock solution, a separation tank for taking in the stock solution, and a separation tank. A water storage tank continuous with the separation tank,
A drainage tank which is continuous with the water storage tank is provided, and an oil recovery pipe is disposed in the separation tank, and the upper end thereof is opened slightly above the liquid surface of the undiluted liquid in the separation tank, and a position facing the opening A whisker net formed by forming metal whiskers in a net shape is provided in the separation tank or the water storage tank. 7. A partition partitioning a water storage tank and a drain tank,
7. The oil / water separation device according to claim 1, further comprising an adjusting plate for adjusting a liquid level inside the water storage tank and the separation tank.