WO2010064401A1

WO2010064401A1 - Oil-water separation device

Info

Publication number: WO2010064401A1
Application number: PCT/JP2009/006490
Authority: WO
Inventors: 村田光
Original assignee: パナソニック株式会社
Priority date: 2008-12-04
Filing date: 2009-12-01
Publication date: 2010-06-10
Also published as: JP2010131516A

Abstract

An oil-water separation device is configured in such a manner that the device is provided with a device for sending a fixed amount of water, the inside of an oil-water separation tank is bifurcated into a front stage and a rear stage, the front stage is made to serve as an oil-water separation chamber for separating oil and a waste liquid, which is mixed with an oil component, into an upper-lower relationship, the oil-water separation chamber is provided with a ceiling, one side of the rear stage is made to serve as a floating-oil collection chamber and the other side of the rear stage is made to serve as a waste-liquid discharge chamber, the inlet of the floating-oil collection chamber is provided to the same height as the ceiling of the oil-water separation chamber, the inlet of the waste-liquid discharge chamber is provided at the lower part of the oil-water separation chamber, an oil collection opening connecting to the outside of the oil-water separation device is provided in the floating-oil collection chamber at a position higher than the position of the ceiling of the oil-water separation chamber, and a waste-liquid discharge opening connecting to the outside of the oil-water separation device is provided in the waste-liquid discharge chamber at a position higher than the position of the ceiling of the oil-water separation chamber and lower than the position of the oil collection opening.

Description

Oil / water separator

The present invention relates to an oil / water separator.

Currently, many oil-water separators that float and separate oil components using the specific gravity difference between oil and water are used to treat oil-mixed water. As this type of apparatus, the following Patent Document 1 to Patent Document 3 are shown.

The oil / water separation device described in Patent Document 1 includes a plurality of partitioning portions that block fluid in a water tank, a plurality of storage portions that store separated light fluid (oil) with a specific gravity through a collection port, and separation promotion. It is an apparatus configured to reliably and efficiently separate and recover oil components. However, in this device, since a plurality of partition portions and oil storage portions are arranged in series with respect to the flow path in the water tank, the height adjustment of the partition plate is complicated and the device is enlarged. . Furthermore, depending on the adjustment position of the partition plate, water may be mixed into the recovered oil, which may increase the recovery amount.

In the oil-water separator described in Patent Document 2, oil is levitated by a coarse filter and a plurality of inclined parallel plate devices and removed by an oil adsorption filter. However, this apparatus requires replacement of the oil adsorption filter, and it cannot be said that the apparatus has been sufficiently simplified in maintenance. Furthermore, the oil-separated liquid must be discharged by a separate drainage pump, and the flow rate of the drainage pump fluctuates. Therefore, when the discharge destination is a wastewater treatment tank, the load on the wastewater treatment tank is kept constant. Not.

The oil-water separator described in Patent Document 3 supplies oil dispersed in the form of particles in the liquid to be treated toward the wall surface, and adheres or stays to agglomerate, thereby coarsening and separating the oil particles. However, in this apparatus, it is necessary to supply the liquid to be processed into the liquid processing apparatus vigorously and at a high flow rate. Therefore, the inside of the liquid processing tank is agitated, and there is a possibility that the once separated processing target liquid and the recovery target liquid are mixed again. Furthermore, since the liquid to be collected is returned to the liquid separation device through the collection flow path and is circulated, it is necessary to wait for the oil to be separated and recovered before draining. Cannot be separated and recovered efficiently.

JP-A-6-71106 JP 2005-34752 A JP 2005-262165 A

The present invention relates to an oil-water separation apparatus having an oil-water separation tank that separates and recovers oil in oil-mixed waste liquid using a specific gravity difference between oil and an oil-mixed waste liquid other than oil. The oil / water separation tank is divided into two parts, the front and the rear, in the direction of the flow of the oil mixed waste liquid by the fixed water supply device, and the first stage is an oil / water separation chamber that separates the oil and oil mixed waste liquid up and down. The oil / water separation chamber is provided with an oil / water separation chamber ceiling that closes the upper surface of the oil / water separation chamber, and the latter stage is further divided into two in the horizontal direction in the direction of flow, one of which is a floating oil recovery chamber into which the floating oil flows in. The waste oil drainage chamber into which the remaining oil mixed waste liquid flows is separated, the floating oil recovery chamber entrance is located at the same height as the ceiling of the oil separation chamber, and the waste fluid drainage chamber entrance is located at the bottom of the oil separation chamber And oil in the floating oil collection chamber The oil recovery port leading to the outside of the separator is provided at a position higher than the ceiling of the oil / water separation chamber, and the waste liquid drain port leading to the outside of the oil / water separator is provided at a position higher than the ceiling of the oil / water separation chamber and lower than the oil recovery port. It is a configuration.

Such an oil-water separator can separate and collect oil and drain at the same time only by operating the fixed-quantity water feeder. Therefore, the oil / water separator can be made compact and maintenance can be saved. In addition, there is no step between the upper part of the oil / water separation chamber and the floating oil recovery chamber, and the floating oil can easily enter. For this reason, the amount of oil to be recovered is increased, the separation performance can be improved, and drainage can be performed with a low oil concentration, so that the load on the wastewater treatment tank can be reduced. In addition, waste liquid is not mixed in the recovered oil, and the amount of waste can be reduced, so that waste disposal costs can be reduced.

FIG. 1 is a schematic diagram showing the configuration of an oil-water separator according to an embodiment of the present invention. FIG. 2A is a perspective view of the oil-water separator from the front. FIG. 2B is a perspective view of the oil-water separator from the side. FIG. 2C is a plan view of the oil-water separator. FIG. 3 is a detailed cross-sectional view taken along the line AA in FIG. 2C. FIG. 4 is a partial bottom view of the oil / water separation tank of the oil / water separator according to the embodiment of the present invention. FIG. 5 is a longitudinal sectional view of an oil / water separation tank of the oil / water separator. FIG. 6 is a perspective view showing a floating oil recovery guide provided on the ceiling of the oil / water separation chamber of the oil / water separation tank of the oil / water separator. FIG. 7 is a perspective view of the oil-water separator.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a schematic diagram showing a configuration of an oil-water separator according to an embodiment of the present invention. As shown in FIG. 1, the oil / water separator according to the embodiment of the present invention includes an oil mixed waste liquid storage tank 1, an oil / water separator tank 3, and a water supply pipe 21. Here, the oil mixed waste liquid storage tank 1 temporarily stores the oil mixed waste liquid to be separated. The oil / water separation tank 3 separates oil mixed waste liquid (hereinafter referred to as waste liquid) into oil and water. That is, the oil / water separation tank 3 separates and recovers the oil in the waste liquid by utilizing the specific gravity difference between the oil and the waste liquid other than oil. The water supply pipe 21 communicates the oil mixed waste liquid storage tank 1 and the oil / water separation tank 3.

The water supply pipe 21 is provided with a quantitative water supply device 2 for sending the waste liquid to the oil / water separation tank 3. An oil-mixed waste liquid discharge port 11 is provided at the bottom of the bottom or side surface of the oil-mixed waste liquid storage tank 1, and is connected to the quantitative water supply device 2 of the water supply pipe 21. The water supply pipe 21 uses a diameter of 10 mm or more in consideration of the viscosity and clogging of the mixed liquid.

The capacity of the oil / water separation tank 3 is about 1/8 of the capacity of the oil / mixture waste liquid storage tank 1 into which the entire amount of the target mixed liquid is poured. Further, the quantitative water supply device 2 can be set to a flow rate for sending the total amount of waste liquid to be poured into the oil-mixed waste liquid storage tank 1 over 2 to 24 hours.

2A is a perspective view of the oil / water separator according to the embodiment of the present invention, FIG. 2B is a perspective view of the oil / water separator from the side, FIG. 2C is a plan view of the oil / water separator, and FIG. 3 is FIG. FIG.

The interior of the oil / water separation tank 3 is divided into two parts, a front stage and a rear stage, in the direction of the flow of waste liquid by the quantitative water supply device 2. The front stage is an oil / water separation chamber 4 for separating oil and waste liquid vertically. The latter stage is further divided into two in the horizontal direction in the direction of flow, the floating oil recovery chamber 5 into which the oil floating on one side flows, and the waste liquid drain chamber 6 into which the waste liquid left after separating the oil floating on the other side flows. .

The oil / water separation chamber 4 is closed by an oil / water separation chamber ceiling 42 that closes the upper surface of the oil / water separation chamber 4. A floating oil recovery chamber inlet 51, which is an inlet to the floating oil recovery chamber 5, is provided at the same height as the oil / water separation chamber ceiling 42.

On the other hand, a waste liquid drainage chamber inlet 61 which is an inlet of the waste liquid drainage chamber 6 is provided in the lower part of the oil / water separation chamber 4. Furthermore, an oil recovery port 52 that leads to the outside of the oil / water separator is provided in the floating oil recovery chamber 5 at a position higher than the ceiling 42 of the oil / water separator. In the waste liquid drain chamber 6, a waste liquid drain port 62 that similarly leads to the outside of the oil / water separator is provided at a position higher than the oil / water separator chamber ceiling 42 and lower than the oil recovery port 52.

Next, the operation of the oil / water separator according to the embodiment of the present invention having the above-described configuration will be described.

Waste liquid is a mixture of oil and water generated at factories, substations, or gas stations. Hereinafter, although it demonstrates as a waste liquid which mixed oil and water | moisture content, if it is a mixed liquid with a specific gravity difference, there exists the same effect.

The waste liquid is temporarily stored in the oil mixed waste liquid storage tank 1 on the upstream side of the flow by the quantitative water supply device 2, and is supplied from the oil mixed waste liquid discharge port 11 to the cleaning waste liquid injection port 41 of the oil / water separation tank 3 via the quantitative water supply device 2. It is sent through the pipe 21. The cleaning waste liquid injection port 41 is a waste liquid injection port. In the oil / water separation chamber 4, as the oil flows downstream, the oil component having a small specific gravity is separated as floating oil on the upper side, and the water having a large specific gravity is separated on the lower side as waste liquid. The floating oil separated on the upper side stays in the vicinity of the oil / water separation chamber ceiling 42 and flows into the floating oil recovery chamber 5 from the floating oil recovery chamber inlet 51 provided at substantially the same height as the oil / water separation chamber ceiling 42.

On the other hand, the waste liquid containing a large amount of water separated on the lower side flows into the waste liquid drainage chamber 6 from the waste liquid drainage chamber inlet 61. Subsequently, the floating oil and the waste liquid separated in the oil / water separation chamber 4 individually raise the water level (liquid level) of the floating oil recovery chamber 5 and the waste liquid drainage chamber 6 according to the amount of each inflow. When the floating oil and the waste liquid exceed the height of the oil recovery port 52 or the waste liquid drain port 62, they fall to the oil discharge pipe 53 and the waste liquid discharge pipe 63 to recover the oil or drain the waste liquid.

Thus, the oil and water separated by utilizing the difference in specific gravity are separated into the floating oil recovery chamber 5 and the waste liquid drainage chamber 6. In the oil / water separation chamber 4, the water surface is blocked by the oil / water separation chamber ceiling 42, but the liquid surface is released after the separation. In the floating oil recovery chamber 5, the floating oil flows in from the floating oil recovery chamber inlet 51 provided on the lower side, and only the floating portion is discharged from the oil recovery port 52, so that the recovered oil has a high ratio of oil. .

Moreover, the oil-water separator of the embodiment of the present invention is provided with an oil mixed waste liquid storage tank 1 for storing waste liquid on the upstream side of the flow by the quantitative water supply device 2, and at the bottom of the oil mixed waste liquid storage tank 1 or the lower part of the side surface, An oil mixed waste liquid discharge port 11 to the fixed amount water feeding device 2 is provided.

Therefore, since the oil which floated and separated in the oil-mixed waste liquid storage tank 1 can be sent to the oil-water separation tank 3 at any time from the low concentration to the oil-water separation tank 3, the separation efficiency in the oil-water separation tank 3 is increased. be able to.

Note that if the horizontal cross-sectional area of the floating oil recovery chamber 5 is made smaller than that of the waste liquid drain chamber 6, the thickness of the floating oil layer inside the floating oil recovery chamber 5 increases, and the water level difference from the waste liquid increases to improve the separation performance.

Further, in the oil / water separator according to the embodiment of the present invention, the floating oil recovery chamber 5 and the waste liquid drain chamber 6 are provided one after the oil / water separation chamber 4. Further, a plurality of floating oil recovery chambers 5 and waste liquid drain chambers 6 are continuously provided in the subsequent stage of the oil / water separation chamber 4, and oil recovery and waste liquid drainage are performed from the most recent floating oil recovery chamber 5 and waste liquid drain chamber 6. , Separation performance is enhanced.

Furthermore, in the oil / water separator according to the embodiment of the present invention, the oil recovery port 52 is provided at the center of the horizontal section of the floating oil recovery chamber 5 and opens upward, and the liquid level of the floating oil is the height of the opening of the oil recovery port 52. When exceeding this, it arrange | positions so that oil may flow out downward to the oil discharge pipe 53 provided in the floating oil collection chamber 5. Therefore, only the upper layer of the floating oil liquid level can be discharged, and the concentration of oil to be collected is increased.

Further, the cleaning waste liquid injection port 41 of the oil / water separation chamber 4 is provided at the bottom of the side surface of the oil / water separation chamber 4 facing the floating oil recovery chamber inlet 51 or the bottom surface near the side surface. As a result, the floating oil separation distance becomes long and it becomes difficult for the floating oil to flow into the waste liquid drain chamber 6, so that the concentration of the oil to be drained becomes low.

FIG. 4 is a partial bottom view of the oil / water separation tank of the oil / water separator according to the embodiment of the present invention. The horizontal sectional shape of the waste liquid drain port 62 provided in the waste liquid drain chamber 6 is substantially similar to the horizontal sectional shape of the waste liquid drain chamber 6. For this reason, the distance between the waste liquid drain chamber wall surface 64 and the waste liquid drain port 62 can be made constant, and the floating oil adhering to the waste liquid drain chamber wall surface 64 can be hardly drained.

FIG. 5 is a longitudinal sectional view of the oil / water separation tank of the oil / water separation device according to the embodiment of the present invention. The oil / water separation chamber ceiling 42 is shaped so as to rise upward as it approaches the floating oil recovery chamber 5. Therefore, the floating oil accumulated in the upper part of the oil / water separation chamber 4 is easy to enter the floating oil collection chamber 5 through the oil / water separation chamber ceiling 42, so that the amount of oil to be collected is increased and the separation performance is improved.

If the oil / water separation chamber ceiling 42 is separated from the oil / water separation chamber 4 and has a removable lid structure, maintenance of the inside of the oil / water separation chamber 4 such as cleaning and inspection is enhanced. Further, a separation promoting device 43 such as an inclined plate may be installed inside the oil / water separation chamber 4.

FIG. 6 is a perspective view showing a floating oil recovery guide provided on the ceiling of the oil / water separation chamber of the oil / water separation tank of the oil / water separator according to the embodiment of the present invention. A floating oil recovery guide 42 b that guides the floating oil to a floating oil recovery chamber inlet 51 that is an inlet of the floating oil recovery chamber 5 is provided on the oil / water separation chamber ceiling 42. The floating oil recovery guide 42 b has a shape in which the portion of the oil remaining in the oil / water separation chamber ceiling 42 gradually narrows toward the floating oil recovery chamber inlet 51. Due to the floating oil recovery guide 42b, the floating oil accumulated in the upper part of the oil / water separation chamber 4 is more likely to flow into the floating oil recovery chamber 5, and the amount of oil to be recovered increases and the separation performance increases.

FIG. 7 is a perspective view of the oil-water separator according to the embodiment of the present invention. FIG. 7 shows an apparatus for sending air to the oil / water separation tank 3 from the water supply pipe 21 connected between the quantitative water supply device 2 and the oil / water separation tank 3. An air supply device 7 for supplying air to the oil / water separation tank 3 is provided at the tip of the water supply pipe 21. Then, after the waste liquid is completely fed from the oil mixed waste liquid storage tank 1 to the oil / water separation tank 3, air is sent to the oil / water separation tank 3 by the air feeding device 7.

As a result, air having a specific gravity smaller than that of the oil enters into the floating oil recovery chamber 5, so that the floating oil water level is pushed up and the oil recovery amount is increased, so that the residual oil amount in the oil / water separation tank 3 can be reduced.

Further, as shown in FIG. 7, the oil / water separator according to the embodiment of the present invention controls the injection of the wash water into the oil mixed waste liquid storage tank 1 after the waste liquid has been sent from the oil mixed waste liquid storage tank 1 to the oil / water separation tank 3. A device 70 is provided.

As a result, the oil in the waste liquid remaining in the bottom of the oil-mixed waste liquid storage tank 1 and the water supply pipe 21 can be removed, and the separation performance can be improved. Moreover, if residual oil can be removed, the cause of anaerobic bacteria breeding and generating malodor can be removed.

Also, the washing water may be injected several times. As a result, the removal amount of oil in the waste liquid remaining in the bottom of the oil-mixed waste liquid storage tank 1 and the water supply pipe 21 can be further increased, and the separation performance can be improved.

The oil / water separation device of the present invention can be used to treat oil-mixed water generated in factories, substations, gas stations, and the like. That is, the oil / water separator according to the present invention is used as a measure for purifying oil to meet the drainage standard value of the Water Pollution Control Law when discharging wastewater from a water collection tank or the like.

Also, the oil / water separator of the present invention can be used when processing coolant such as metal cutting and polishing in a factory or the like. Furthermore, the oil-water separator of the present invention separates and recovers oil as a pretreatment for sending oil mixed cleaning wastewater having a relatively high oil concentration generated when cleaning oil adhering to equipment or workpieces to a wastewater treatment tank, It can be used as a measure to reduce the load on the wastewater treatment tank.

Further, the oil / water separator of the present invention is an oil component generated when the inside of the electrostatic precipitator to which oil has adhered is washed with a cleaning liquid in an electrostatic precipitator that removes mist-like oil floating in a machine factory, a foundry, or the like. It can also be used to separate oil in mixed washing waste liquid.

DESCRIPTION OF SYMBOLS 1 Oil mixing waste liquid storage tank 2 Metered water feeder 3 Oil water separation tank 4 Oil water separation chamber 5 Floating oil collection chamber 6 Waste liquid drainage chamber 7 Air supply device 11 Oil content mixing waste liquid discharge port 21 Water supply piping 41 Cleaning waste liquid injection port 42 Oil water separation chamber ceiling 42b Floating oil recovery guide 43 Separation promoting device 51 Floating oil recovery chamber inlet 52 Oil recovery port 53 Oil discharge pipe 61 Waste liquid drain chamber inlet 62 Waste liquid drain port 63 Waste liquid drain pipe 64 Waste liquid drain chamber wall surface 70 Control device

Claims

In an oil / water separator having an oil / water separation tank for separating and recovering the oil in the oil / mixture waste liquid using the specific gravity difference between the oil and the oil / mixture waste liquid other than the oil, the oil / mixture waste liquid is A fixed-quantity water supply device for sending to the oil-water separation tank, and the oil-water separation tank is divided into a front stage and a rear stage in the direction of the flow of the oil-mixed waste liquid by the fixed-quantity water-feed device, and the front stage includes the oil and the oil-mixed waste liquid The oil / water separation chamber is provided with an oil / water separation chamber ceiling that closes the upper surface of the oil / water separation chamber, and the latter stage is further divided into two parts in the horizontal direction in the direction of the flow, and one of the surfaces floats. The floating oil recovery chamber into which the oil flows is used as the waste liquid drainage chamber into which the remaining oil separated waste liquid flows in, and the floating oil recovery chamber has the same height as the ceiling of the oil / water separation chamber. Arranged An inlet of the waste liquid drainage chamber is disposed at a lower portion of the oil / water separation chamber, and an oil recovery port is provided in the floating oil recovery chamber at a position higher than the ceiling of the oil / water separation chamber. An oil / water separator according to claim 1, wherein a wastewater drainage port communicating with the outside of the oil / water separator is provided at a position higher than the ceiling of the oil / water separator and lower than the oil recovery port.
An oil-mixed waste liquid storage tank for storing the oil-mixed waste liquid is provided on the upstream side of the flow by the fixed-quantity water supply apparatus, and the oil-mixed waste liquid discharge to the fixed-quantity water supply apparatus is provided at the bottom or the lower side of the oil-mixed waste liquid storage tank. The oil / water separator according to claim 1, wherein an outlet is provided.
The oil / water separator according to claim 1 or 2, wherein a horizontal cross-sectional area of the floating oil recovery chamber is smaller than a horizontal cross-sectional area of the waste liquid drainage chamber.
The oil recovery port is provided in the center of the horizontal section of the floating oil recovery chamber, and the floating oil recovery is performed when the level of the oil that opens upward and floats exceeds the opening height of the oil recovery port. The oil / water separator according to claim 1, wherein the oil / water separator is arranged so that oil flows downward to an oil discharge pipe provided in the chamber.
The oil-water separator according to claim 1, wherein a horizontal cross-sectional shape of the waste liquid drain port is similar to a horizontal cross-sectional shape of the waste liquid drain chamber.
The oil / water separator according to claim 1, wherein the ceiling of the oil / water separation chamber has a removable lid structure.
The oil / water separator according to claim 1, wherein the ceiling of the oil / water separation chamber has an upward slope toward the floating oil recovery chamber.
The oil / water separator according to claim 1, wherein a floating oil recovery guide is provided on the ceiling of the oil / water separation chamber to guide the floating oil to an inlet of the floating oil recovery chamber.
2. The oil / water separation according to claim 1, wherein a cleaning waste liquid injection port, which is a water injection port for the oil component mixing waste liquid, is provided at a lower portion or a bottom surface of the side surface of the oil / water separation chamber facing the inlet of the floating oil recovery chamber. apparatus.
A water supply pipe is connected between the fixed-quantity water supply device and the oil / water separation tank, and an air supply device is provided at the tip of the water supply pipe to complete the water supply of the oil / mixture waste liquid from the oil / mixture waste liquid storage tank to the oil / water separation tank. 3. The oil / water separator according to claim 2, wherein air is sent to the oil / water separator tank by the air supply device.
3. The oil water according to claim 2, further comprising a control device that injects cleaning water into the oil mixed waste liquid storage tank after the oil mixed waste liquid has been fed from the oil mixed waste liquid storage tank to the oil water separation tank. Separation device.
The oil / water separator according to claim 11, wherein the washing water is injected a plurality of times.