JP2003154202A - Oil separating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil separating system which is used when the oil contained in an oil in water mixture such as a cleaning liquid is separated and recovered and by which the oil floated on the surface of the oil in water mixture can be collected and separated effectively without mixing air in the separated oil. SOLUTION: This oil separating system is provide with a collecting vessel 3 arranged in the oil in water mixture 2 for sucking and collecting oily water in the mixture 2 by a sucking means 7 and an oil separating means 8 for separating the oily water collected in the vessel 3 into oil and water. The vessel 3 is constituted of a bottom-blind cylindrical main body 4 having an discharge port in the lower part for discharging the sucked and collected oily water and a floating cylinder 5 fit/arranged in the body 4 to be moved vertically while leaving a prescribed space between them. A float 15 for making the cylinder 5 float in the vicinity of the oil level of the mixture 2 is arranged integrally with the cylinder 5.

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 system used for separating and recovering an oil component contained in an oil / water mixture such as a cleaning liquid.

[0002]

2. Description of the Related Art Conventionally, for example, in a metal working process such as cutting and pressing and a surface treatment process such as plating, painting and heat treatment, degreasing cleaning is performed in a pre-process and a post-process.
The water-soluble cleaning liquid generally used as such a cleaning liquid is gradually contaminated by the mixing of the mineral processing oil adhering to the object to be cleaned, and re-adhesion of oil to the object to be cleaned, deterioration of cleaning ability, and cleaning liquid. In addition to causing putrefaction, etc., it also becomes oil-containing wastewater when the cleaning liquid is renewed, causing an environmental load.

As a method for separating and recovering oil from these oil-containing wastewaters, for example, a method is used in which the oil is separated and floated until it floats, and then the floating oil is scooped with a ladle or the like, or an oil adsorption mat, etc. A common method is to float the material on the surface of the cleaning liquid to suck oil, or to continuously scoop up the liquid on the surface with a belt-type or disc-type oil skimmer.

However, it takes time for the oil to separate and float, and it is inefficient to scoop the floated oil with a ladle or the like. On the other hand, in the method using the oil adsorption mat or the oil skimmer type, not only the oil content but also the cleaning liquid is mixed, and the amount of waste water increases. Moreover, since the cleaning liquid is agitated during the cleaning, the oil hardly floats, and there are problems such as poor recovery efficiency.

Therefore, recently, a cleaning liquid sucked by a pump or the like is supplied to a separation tank containing a coarse-grained structure, and the coarse-grained structure coarsens fine oil droplets in the cleaning liquid to shorten oil-water. A so-called coalescer method is used, in which specific gravity difference is separated according to time.

However, in the coalescer method, when air is mixed in the cleaning liquid to be separated, the separation performance is deteriorated. Therefore, when the cleaning liquid is sucked by a pump or the like, it is necessary to suck the cleaning liquid from the inside. Therefore, there has been a problem that the oil component gradually rising from the cleaning liquid to the surface by the operation for a long time cannot be collected and remains.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, in which air also mixes the oil content floating on the surface of the oil-water mixed liquid such as the cleaning liquid as described above. It is an object of the present invention to provide an oil / water separation system that can collect and separate without problems.

[0008]

In order to achieve the above object, the oil / water separation system according to the present invention has the following constitution. That is, a collection container that is installed in an oil-water mixture and that sucks and collects the oil-containing liquid in the oil-water mixture by a suction means, and an oil-water separation that separates oil and water of the oil-containing liquid collected by the collection container And a bottomed cylindrical container body having a discharge port for sucking and discharging the oil-containing liquid at the bottom thereof, and a vertically movable body at a predetermined interval in the container body. And a float that floats the floating cylinder near the liquid surface of the oil-water mixture, and is integrally provided on the floating cylinder.

If necessary, a tray portion having a diameter larger than that of the fitting portion with the container body may be integrally provided on the upper portion of the floating cylinder, and the floating cylinder may be extended over substantially the entire length in the vertical direction. They may be formed to have substantially the same diameter. Further, a plurality of floating cylinders may be provided inside the container body so as to be vertically movable.

The gap between the container body and the floating cylinder is
When the oil-containing liquid is sucked from the outlet of the container body, the amount of liquid sucked from the upper end of the floating cylinder is the total amount of the liquid sucked from between the container body and the floating cylinder. It is recommended to set it to be 50 to 95% by weight of the liquid volume,
Further, as the oil-water separating means, it is preferable to use a means provided with a coarse-grained structure for coarsening fine oil droplets in the oil-containing liquid collected in the collection container.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is an explanatory diagram showing an embodiment of an oil / water separation system according to the present invention.

In the figure, reference numeral 1 denotes a storage tank, in which an oil / water mixed liquid 2 such as a cleaning liquid is stored, and a collection container 3 for collecting the oil-containing liquid in the oil / water mixed liquid 2 is the storage tank. It is provided in 1. The collection container 3 includes a bottomed cylindrical container body (fixed cylinder body) 4 and a floating cylinder body (moving cylinder body) that is fitted in the container body 4 so as to be vertically movable at a predetermined interval. ) 5 and a suction pump 7 as a suction means which is connected to a discharge port 4a formed in the container body 4 through a pipe 6a to collect the oil-containing liquid in the oil-water mixture 2 in the collection container 3. It is configured to be collected in.

Further, the oil-containing liquid collected in the collection container 3 and sucked by the suction pump 7 is continuously guided to the oil-water separation device 8 as oil-water separation means through the pipe 6b, and inside the oil-water separation device 8. Oil 1 by the coarse-grained structure 9 provided in
It is separated into 0 and water 11. The separated oil 10
Is recovered in the oil recovery container 13 via the pipe 12, and the separated water 11 is circulated to the storage tank 1 via the pipe 14. In the figure, 12a is an opening / closing valve provided in the middle of the pipe 12.

FIG. 2 shows an example of a concrete structure of the collection container 3. The collection container 3 has a bottomed cylindrical container body 4 as described above, and a predetermined inside of the container body 4. And a floating cylinder 5 that is vertically movably fitted and arranged with a space therebetween. In the present embodiment, the discharge port 4a is provided on the lower peripheral surface of the container body 4. The container body 4 is arranged and fixed at the bottom of the storage tank 1 or in the vicinity thereof by a fixture or the like not shown in the drawing.

On the other hand, in the present embodiment, the floating tubular body 5 has a structure in which a tray portion 5b having a larger diameter than that is integrally provided on the upper portion of the fitting tubular portion 5a with the container body 4. The bottom portion of the tray portion 5b communicates with the inside of the fitting tubular portion 5a. A hollow float 15 is attached and supported at a substantially central portion in the tray portion 5b through a plurality of support rods 15a, and the floating cylinder 5 allows a predetermined space between the floating tubular body 5 and the container body 4. The oil and water mixed liquid 2 in the storage tank 1 is held in a floating state in the vicinity of the liquid level in a state where the space is maintained.

The space between the container body 4 and the floating cylinder body 5, in this embodiment, the container body 4 and the fitting cylinder portion 5
The distance a and the distance are adjusted so that at least the floating cylinder 5 can move smoothly in the vertical direction with respect to the container body 4, and may be appropriately set within a range of, for example, about 1 to 10 mm. Further, although the outlet 4a of the container body 4 is installed on the lower side surface of the container body 4 in the above embodiment, it may be installed on the bottom. In order to prevent the vertical movement of the floating cylinder 5 from being affected by the suction force in the vicinity of the outer surface thereof, the floating cylinder 5 is preferably installed at or near the bottom.

Further, the material of the container body 4, the floating cylinder 5 and the float 15 is appropriately selected. For example, a resin such as acrylic, vinyl chloride, polypropylene or polyethylene,
Alternatively, a metal such as stainless steel, iron, or aluminum, or a metal obtained by plating the surface of the metal can be used. Further, the float 15 is not limited to the hollow one as shown in FIG. 2 and may be a solid one as long as it can give a sufficient buoyancy to the floating cylinder 5.

In the above structure, the oil-water mixture 2 stored in the storage tank 1 partly separates and floats up from the oil contained in the oil-water mixture 2 with the lapse of time, and the oil is collected on the surface thereof. A layer of the floating oil-containing liquid (oil-based liquid) 2a containing a large amount is formed. On the other hand, the floating tubular body 5 is at the upper end portion of the floating tubular body 5 as shown in FIG. 3A by the buoyant force of the float 15 in a stationary state, that is, in a state in which the suction force by the suction pump 7 is not applied. In tray part 5
The upper end of b is slightly above the liquid surface of the floating oil-containing liquid 2a. The amount of protrusion is float 15
It depends on the size of the floating cylinder and the weight of the floating cylinder 5, but it is preferable to adjust the upper end of the floating cylinder 5 so that it floats above the liquid surface by about 5 to 20 mm when it is at rest.

When the suction pump 7 is driven in that state,
Due to the suction force of the pump 7, the floating cylinder 5 is moved to the position shown in FIG.
And the upper end of the floating cylinder 5, in the present embodiment, the upper end of the tray portion 5b moves below the liquid surface of the oil-impregnated liquid 2a, so that the oil-impregnated liquid enters the tray portion 5b. 2a flows in. When the suction pump 7 is continuously driven in this state, the oil-containing liquid 2a that has flowed into the tray portion 5b.
Is sucked and collected in the container body 4 via the fitting cylinder portion 5a with the container body 4 and floats from the space between the container body 4 and the floating cylinder body 5 to the vertical middle portion of the oil-water mixture 2. The oil-containing liquid is collected by suction in the container body 4.

In order to efficiently suck the oily liquid 3 floating on the surface of the oil-water mixture 2, the upper end of the floating cylinder 5, which is lowered by the sedimentation of the floating cylinder 5, the tray part in this embodiment. The position of the upper end of 5b is the oil-water mixture 2
It is preferable to adjust the position so as to be lower than the boundary surface between the oily liquid 3 and. Specifically, it is preferable to adjust the balance between the liquid suction amount from the discharge port 4a and the specific gravity of the float 15 to determine the liquid inflow amount into the tray portion 5b.

In the present embodiment, the oil-containing liquid 2a that floats on the surface of the oil / water mixture 2 as described above is used as the floating cylinder 5.
Not only is it collected from the upper part of the container, but also the oil-containing liquid with a small oil content that floats between the container body 4 and the floating cylinder 5 in the vertical middle portion of the oil-water mixture 2 is collected. However, the oil-containing liquid in the intermediate portion does not necessarily have to be collected.

Further, the opening area (horizontal cross-sectional area) of the upper end of the floating tubular body 5, in the present embodiment, the upper end of the tray portion 5b is preferably adjusted appropriately according to the required liquid inflow amount. In order to increase the amount, it is necessary to secure a large opening area (horizontal cross-sectional area) at the upper end, especially a large circumferential length of the inner circumference of the opening. For example, in order to allow 1 m ³ of the oil-containing liquid to flow in for one hour, it is preferable to set the inner diameter (diameter) of the upper end portion within a range of 5 to 15 cm when the upper end portion has, for example, a circular shape.

The vertical length of the floating cylinder 5 is such that the floating cylinder 5 has a structure independent of the container body 4.
It can be easily adjusted according to the depth of the oil-water mixed liquid 2 stored in the storage tank 1. Further, since the floating cylinder 5 and the container body 4 are independent of each other, maintenance such as removal of deposits on the outer and inner surfaces is easy, and the float 15 of the floating cylinder 5 when the physical properties of the liquid change. Buoyancy can be easily adjusted.

Next, in the present embodiment, the oil-water separation device 8 has the coarse-grained structure 9 incorporated therein as described above, and an example of its concrete structure is shown in FIGS. 4 and 5.

In FIG. 4, reference numeral 20 denotes an apparatus main body case in which the coarse-grained structure 9 is hermetically accommodated, and an introduction port 20a for introducing an oil-containing liquid is provided in the lower portion of the main body case 20.
The inlet 20a is connected to the suction pump 7 through the pipe 6b. In addition, the main body case 2
0 is provided with the separated oil discharge port 20b and the lower part is provided with the separated water discharge port 20c.
The pipes 12 and 14 are connected to 20c, respectively.

As shown in FIG. 5, the coarse-grained structure 9 is provided between a perforated inner tube 21 and a perforated outer tube 22 made of a net or punching metal or the like having a large number of through holes on its peripheral surface. It has a structure in which a coarsening medium 23 made of a porous material is interposed, an end plate 24 is provided at the lower end of the coarsening structure 9, and a cylindrical portion 24 a integrally provided on the end plate 24. The inside of the perforated inner tube 21 and the introduction port 20a are communicatively connected to each other through. The upper end of the coarse-grained structure 9 is closed by a lid 25.

The material and the like of each member constituting the oil / water separator 8 are appropriate, and for example, the main body case 20, the perforated inner and outer pipes 21 and 22, the end plate 24, and the lid 2 can be used.
As the material of 5, a resin such as vinyl chloride or a metal such as iron or stainless can be used. In addition, the coarse-grained medium 2
As the material 3, a known material such as a fibrous substance such as a non-woven fabric made of synthetic fiber, natural fiber, metal fiber, glass fiber, etc., a fine particle aggregate of metal or resin, or ceramic porous material can be used. The perforated inner tube 21 and the outer tube 22 may not be necessarily provided depending on the property and material of the coarse graining medium 23.

In the above structure, the oil-containing liquid collected in the collection container 3 by the suction pump 7 of FIG. 1 and guided to the oil / water separator 8 is introduced into the introduction port 2 of the main case 20.
0a through the tubular portion 24a of the end plate 24 and then introduced into the perforated inner tube 21, then passes through the perforated inner tube 21, the coarse-grained medium 23, and the perforated outer tube 22, and the outer main body case Move into 20. At that time, the oil content in the oil-containing liquid is coarsened in the process of passing through the coarsening medium 23.

That is, the oil 26 in the oil-containing liquid introduced into the main body case 20 through the introduction port 20a is atomized by the stirring action of the suction pump 7 and the like, and has an extremely fine particle diameter of about several microns. Although dispersed as shown in FIG. 5, they are aggregated and coarsened to a particle diameter of several hundreds of microns to several millimeters in the course of passing through the coarsening medium 23 of the coarse structure 9. The coarse-grained oil 26 has an increased buoyancy and sequentially floats upward in the oil-water separator 8 against the downward flow of water. Thereby, the main body case 20 is separated from water.
Separated oil 10 collects in the upper part of the inside, and separated water 11 collects in the lower part.

The separated oil 10 is the separated oil discharge port 2 described above.
By opening the on-off valve 12a of the pipe 12 connected to the oil recovery container 0b, the oil recovery container 1 described above can be provided with almost no water content.
3, the separated water 11 is circulated from the separated water discharge port 20c to the storage tank 1 through the pipe 14 in a state in which the oil is separated and cleaned. The separated oil 10 may be automatically discharged by devising a structure of an oil / water interface such as a float type or a capacitance type or a water outlet piping structure.

As described above, in the present invention, the collection container 3 for sucking and collecting the oil-containing liquid by the suction means such as the suction pump 7 is installed in the oil-water mixed liquid 2, and the collection container 3 has a bottom. It is composed of a tubular container body 4 and a floating tubular body 5 fitted and arranged so as to be vertically movable at a predetermined interval.
Since the floating cylinder 5 is configured to float near the liquid surface of the oil-water mixture 2 by the float 15, the oil-containing liquid that floats on the surface of the oil-water mixture 2 and the oil-containing liquid in the oil-water mixture 2 are excellent. Can be collected by suction.

The oil-containing liquid collected in the collection container 3 can be satisfactorily separated by an oil / water separation means such as an oil / water separation device 8. In particular, the coarse-grained structure 9 is used as in the above embodiment. By using the coalescer-type oil-water separating means described above, it is possible to favorably separate even two liquids that are insoluble and have a difference in specific gravity from each other. That is, in the coalescer method, the mixed liquid as described above is passed through the roughening medium 23 to capture and agglomerate a small amount of fine liquid particles, which can be easily separated in a large amount of liquid due to a difference in specific gravity. It is a method to grow small amount of liquid particle size to the size that is used. By using this method, 2 liquids can be used for not only separation of aqueous liquid and oily liquid but also separation of aqueous liquid and organic solvent. Can be separated.

In the above embodiment, the tray portion 5b is formed on the upper portion of the floating cylinder 5, and the float 15 is attached and supported in the tray portion 5b via a plurality of support rods. For example, as shown in FIG.
It may be installed on the inner wall portion of b, or may be installed on the outside of the tray portion 5b via a support rod 15a or the like as shown in FIG. When the float 15 is installed outside the tray portion 5b as described above, it is preferable to install a plurality of floats 15 as shown in FIG. Further, in order to reduce the installation area (installation space) of the floating cylinder 5, the above-mentioned FIG.
As shown in (a), it is preferable to install it on the central portion or the inner wall portion of the tray portion 5b.

The floating cylinder 5 may be simply formed in a cylindrical shape as shown in FIGS. 7A to 7C without providing the tray portion 5b as described above. In this case, the float 15 may be attached in the same manner as described above. FIG. 7A shows an example in which the float 15 is attached to the upper part of the floating cylinder 5 via a plurality of support rods 15a. An example in which it is directly attached to the inner wall portion of the floating cylinder 5, and FIG. 7C shows an example in which it is installed outside the floating cylinder 5 via a support rod 15a.

In each of the above embodiments, when the floating cylinder 5 or the tray portion 5b itself has buoyancy, the above float may be omitted. Further, the planar shape (horizontal cross-sectional shape) of the tray portion 5b, the floating cylinder body 5 and the container body 4 is not particularly limited, and is circular, elliptical,
A polygonal shape or the like may be used, but a circular shape is preferable from the viewpoint of improving the balance during floating of the floating cylinder 5.

Further, in each of the above-described embodiments, the collection container 3 is composed of one container body 4 and one floating cylinder 5, but a plurality of floating cylinders may be provided in the inner and outer directions. Figure 8
Is a front view of a collection container showing an example thereof, and FIG. 9 is a plan view thereof. In this example, two floating cylinders 51 are provided inside the container body 4.
The 52 is fitted and arranged in a substantially concentric manner in the inner and outer directions at a predetermined interval so as to be vertically movable.

The container body 4 is formed in a cylindrical shape with a bottom, and a discharge port 4a made of an elbow tube is integrally provided at the bottom of the container body 4. A plurality of support rods 15a arranged in a substantially cross shape in a plane are integrally fixed to the lower portion of the floating cylinder 51 by welding or the like, and are integrally fixed to the central portion of the plurality of support rods 15a by welding or the like. A hollow float 15 is vertically movably attached to the nut 15b via a bolt 15c screwed to the nut 15b.

Further, flange-shaped stoppers 51a, 52a that abut and engage with each other are provided on the outer surface of the lower end portion of the floating tubular body 51 and the outer surface of the upper end portion of the floating tubular body 52, respectively. On the outer surface and the outer surface of the upper end of the container body 4,
A flange-shaped stopper 52b and a stopper screw 4b that are in abutting engagement with each other are provided. In the present embodiment, the stoppers 51a, 52a, and 52b have a structure in which ring-shaped rods are fixed by welding or the like. However, the stoppers 51a, 52a, and 52b are formed by bending the ends of the floating cylinders 51 and 52 into a flange shape. You may.

In the above structure, the container body 4 is fixedly arranged at or near the bottom of the storage tank 1 in which the oil / water mixed solution 2 is stored, as in the above embodiment, and the floating cylinder 51 is floated by the float 15. When it floats near the liquid surface of the floating cylinder 52, the floating cylinder 52 is attached to the stopper 51a of the floating cylinder 51.
The stopper 52a comes into contact with the floating cylinder 52 so that the floating cylinder 52 floats above the container body 4 integrally with the floating cylinder 51.

At this time, the upper end portion of the floating cylinder 51, when the suction pump 7 is not driven, is mixed with the oil-water mixture 2
When the suction pump 7 is driven in this state, the floating cylinders 51 and 52 are moved downward by the suction force of the pump 7 to move downward.
As shown in FIG. 8, the upper end of 1 moves below the liquid surface of the oil-water mixed liquid 2 and floats on the liquid surface of the oil-water mixed liquid 2.
a is the space between the floating cylinder 51 and the float 15
It flows into 1.

When the suction pump 7 is continuously driven in this state, the oil-containing liquid 2a flowing into the floating cylinder 51 is sucked and collected in the container body 4, and the space between the container body 4 and the floating cylinder 52 is also collected. Therefore, the oil-containing liquid floating in the vertical middle portion of the oil-water mixture 2 is sucked and collected in the container body 4.

In the above embodiment, the floating cylinder 5
1 and the contact stopper 51a, 52a of the floating cylinder 52,
The floating cylinders 51 and 52 are provided over substantially the entire length in the circumferential direction. However, if they are provided at a predetermined interval in the circumferential direction, the oil-containing liquid can be obtained from between the floating cylinders 51 and 52. Can be collected.

When a plurality of floating cylinders are provided as described above,
The container body 4 at the upper end of the floating cylinder 51 arranged at the highest level
It is possible to secure a large vertical movement stroke with respect to the oil-containing liquid 2a that floats on the liquid surface of the oil-water mixed liquid 2 even if the liquid surface of the oil-water mixed liquid stored in the storage tank 1 greatly changes. Can be collected. Further, there is an advantage that the liquid can be collected even if the liquid level becomes extremely low.

In the illustrated example, the float 15 is rotated to adjust the amount of screwing of the bolt 15c provided integrally with the float 15 into the nut 15b.
The height position of the float 15 with respect to the movable cylinder 51, and by extension, the height position of the upper end portion of the floating cylinder 51 with respect to the liquid surface of the oil-water mixed liquid 2, can be adjusted as appropriate, whereby the liquid surface of the oil-water mixed liquid 2 can be adjusted. The collection amount of the floating oil-containing liquid 2a can be adjusted.

Further, when not used, the floating cylinders 51 and 52 are housed in the container body 4 as shown in FIG. 10, so that the whole becomes compact and compact, which is convenient for transportation and storage.

Further, in the illustrated example, by removing the stopper screw 4b screwed into the container body 4, the container body 4 and the floating cylinder 51 and the floating cylinder 52 can be disassembled separately, and the float 15 is further removed. Rotate and bolt 1
The float 15 can be separated from the floating cylinder 51 by removing 5c from the nut 15b. Thereby, there is an advantage that each of the above-mentioned members can be washed and stored separately.

[0047]

EXAMPLES The oil-water separation system according to the present invention will be described in more detail with reference to specific examples. [Example 1] Oil-water separation was performed under the following conditions using the oil-water separation system shown in Fig. 1. That is, the floating cylinder 5 and the container body 4 are installed in the storage tank 1 in which oil floats,
The oil-water mixed liquid is sucked by the suction pump 7 at a rate of 1.0 m ³ / hour and supplied to the oil-water separator 8. Under these conditions, the floating tubular body 5 was a tubular body made of acrylic resin and had an outer diameter of 10 cm and a thickness of 2 mm, and the container body 4 was made of stainless steel and had an outer diameter of 12 cm and a thickness of 0.8 mm. In the oil-water mixture introduced into the oil-water separator, the oil was captured and aggregated when passing through the coarse-grained structure 9, and the oil was separated and floated above the oil-water separator 8 due to the difference in specific gravity. When the floating oil is stored up to the position of the oil / water interface level sensor (not shown), the opening / closing valve (solenoid valve) of the oil discharge pipe 12
Was opened, and the oil accumulated in the uppermost part was sequentially discharged and collected in the oil collecting container 13. On the other hand, the cleaning liquid from which the oil content was separated was recirculated from the separated water discharge port in the lower part of the oil / water separator 8 to the storage tank 1 via the pipe 14.

In this example, 38 L / day of oil could be recovered by operating the oil / water separation system of the present invention in the storage tank 1 having 40 L / day of oil brought in. The oil content of the cleaning liquid after the oil separation was 100 ppm or less.

[0049]

As described above, according to the oil / water separation system of the present invention, the oil content mixed in the cleaning liquid or the like can be simultaneously sucked from both the liquid surface and the liquid surface and introduced into the oil / water separation device. Performance and instant oil-water separation are possible. That is, regardless of whether the oil component floats on the cleaning liquid or is dispersed in the cleaning liquid, the oil component turbid in the cleaning liquid can be separated at high speed and with high efficiency. Also, since the collection container can be made compact and compact,
The installation area (installation space) is small, and the height dimension is automatically changed according to the depth of the cleaning liquid, so a fixed amount of oil-impregnated liquid is always collected well regardless of fluctuations in the liquid surface. be able to. Further, since the collection container 3 is composed of the container body and the floating cylinder, it is easy to wash during or after use, and it is possible to provide an oil-water separation system having excellent maintainability.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an oil / water separation system according to the present invention.

FIG. 2 is a vertical cross-sectional view of a collection container used in the oil / water separation system.

FIG. 3 is an explanatory view showing a collection state of an oil-containing liquid by the collection container.

FIG. 4 is a vertical cross-sectional view of an oil / water separation device used in the oil / water separation system.

FIG. 5 is a vertical cross-sectional view of a part of the coarse-grained structure incorporated in the oil-water separator.

FIG. 6 is an explanatory view showing a modified example of a collection container.

FIG. 7 is an explanatory view showing another modification of the collection container.

FIG. 8 is a vertical sectional front view showing still another modified example of the collection container.

FIG. 9 is a plan view of the collection container.

FIG. 10 is a vertical cross-sectional front view of the movable container of the collection container housed in the container body.

[Explanation of symbols]

1 Storage tank 2 oil-water mixture 3 collection containers 4 container body 5 floating cylinder 7 Suction pump (suction means) 8 Oil-water separator (oil-water separator) 9 Coarse-grained structure 13 Oil recovery container 15 floats

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/40 C02F 1/40 B

Claims (6)

[Claims] 1. A collection container which is installed in an oil-water mixture and sucks and collects an oil-containing liquid in the oil-water mixture by a suction means.
A bottomed cylindrical container body having an oil-water separating means for separating oil and water of the oil-containing liquid collected in the collection container, and having the discharge container at the bottom thereof with an outlet for sucking and discharging the oil-containing liquid. When,
A floating cylinder body that is fitted in the container body so as to be vertically movable at a predetermined interval, and a float that floats the floating cylinder body in the vicinity of the liquid surface of the oil-water mixture is used for the floating cylinder body. An oil-water separation system characterized by being integrally provided in the. 2. The oil-water separation system according to claim 1, wherein a tray portion having a diameter larger than that of the fitting portion with the container body is integrally provided on the upper portion of the floating cylinder. 3. The oil-water separation system according to claim 1, wherein the floating cylinder is formed to have substantially the same diameter over substantially the entire length in the vertical direction. 4. The oil / water separation system according to claim 1, wherein a plurality of the floating cylinders are provided inside the container body so as to be vertically movable. 5. The amount of liquid sucked from the upper end of the floating cylinder when sucking the oil-containing liquid from the discharge port of the container main body is the amount of liquid sucked from between the container main body and the floating cylinder. 5. The gap between the container body and the floating cylinder is set to a predetermined value so as to be 50 to 95% by weight of the total liquid amount including the above. Oil water separation system. 6. The oil-water separating means comprises a coarse-grained structure for coarsening fine oil droplets in the oil-containing liquid collected in the collection container. Oil water separation system.