JP2000061206A - Oil-water separator and water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-water separator and a water purifier in which a liquid mixture of oil and water can be surely and quickly separated and which can be used for a long period of time in a severe use environment such as inside ships. SOLUTION: This oil-water separator 2 is provided with an oil-water separation vessel 20 to whose upper end part a liquid mixture of oil and water is fed, whose intermediate part is provided with an oil discharge plug 15 and whose lower end part is provided with a drain pipe 14, a falling mechanism 5 installed along the inner peripheral wall 25 of an upper end part in the oil- water separation vessel 20 and for making the liquid mixture of oil and water flow down along the inner peripheral wall, a partition plate 6 installed below the oil discharge plug 15 of the oil water separation vessel 20 and also having a separated water falling hole 61 and an oil layer 10 floated on the liquid mixture of oil and water above the partition plate 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water separator that separates and collects oil from bilge water in which oil is mixed with water, factory wastewater, and the like, and a water purifier using the oil / water separator. .

[0002]

2. Description of the Related Art At the bottom of a ship, water leaking from a screw shaft and oil discharged from an engine are accumulated as bilge water. This bilge water was discharged to the outside of the ship by the water suction pipe and the bilge pump. For this reason, the oil contained in the bilge water will be dumped outboard,
It causes environmental pollution such as rivers, harbors, and oceans. Further, it is necessary to treat an oil / water mixed liquid containing a large amount of oil even in a marine accident of a ship or a factory.

[0003]

It is desirable that oil-water mixed liquid such as bilge water of a ship is separated into oil-water and the oil is treated at a port or the like, and the water is purified and discharged so as not to cause environmental pollution. An object of the present invention is to provide an oil / water separator and a water purifier that can reliably and quickly separate an oil / water mixed liquid and can be used for a long period of time in a ship or the like where the environment of use is severe.

[0004]

The oil / water separator according to the present invention is an oil / water separator in which an oil / water mixture is supplied to the upper end, an oil outlet is provided in the middle, and a water outlet is provided in the lower end. A container, a flow-down mechanism installed along the inner peripheral wall of the upper end portion in the oil-water separation container, and a flow-down mechanism for causing the oil-water mixed liquid to flow down along the inner peripheral wall, and provided under the oil outlet of the oil-water separation container, It is provided with a partition plate having a separation water flow-through hole, and an oil layer floating above the oil-water mixture on the partition plate in the oil-water separation container.

[0005]

According to the present invention, the oil-water mixed liquid pumped up by the liquid pump or the like is made to flow laminarly along the inner peripheral wall by the flow-down mechanism provided at the upper end of the oil-water separation container to flow down. For this reason, it is possible to prevent the oily water from forming an emulsion (emulsion) in which the oily water becomes fine particles, and the oily water can be separated quickly and smoothly. Further, since the partition plate having the separated water flow-through hole prevents the separated water that has been oil-water separated from mixing with the oil-water mixture, the oil droplets remaining in the drainage can be reduced. Furthermore, since the oil layer is floated on the oil-water mixture on the upper part of the partition plate, the oil-water can be separated quickly.

According to the second aspect of the present invention, the oil droplets can be smoothly floated from the separated water below the partition plate and can reach the oil layer through the oil / water mixed liquid layer from the separated water flow down hole. Can be reduced to 0.5 ppm or less. In the configuration according to claim 3, a small amount of oil particles contained in the separated water are adsorbed by charcoal, and the water is adsorbed to the extent that it does not adversely affect the environment (0.02-0.04 ppm) even if it is drained as it is. Can be purified. With the configuration according to the fourth aspect, the oil-water mixed liquid can be supplied to the oil-water separation container while preventing the oil-water mixed liquid from being stirred and emulsified by the pump. Therefore, the separation time of the oil / water in the oil / water separation container can be shortened.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described with reference to an embodiment shown in the drawings. In FIG. 1, 2 indicates an oil / water separator,
Reference numeral 3 denotes a water purifier connected downstream of the oil / water separator 2. FIG. 2 shows a liquid pump 4 connected upstream of the oil / water separator 2. The oil / water separator 2, the water purifier 3, and the liquid pump 4 constitute a water purifier 1.

The oil / water separation device 2 has an oil / water separation container 20 having a vertical cylindrical shape, and is fixed to a floor 22 such as a ship bottom by legs 21 provided on the container bottom. Oil water separation container 2
The discharge pipe 11 to which the mixed liquid discharged from the liquid pump 4 is supplied is inserted into the peripheral portion of the ceiling plate 23 of No. 0, the inverted J-shaped exhaust pipe 12 is attached to the middle portion, and the oil is provided in the central portion. The sensor 13 is plugged in.

At the upper end of the oil / water separation container 20, there is provided a flow-down mechanism 5 for causing the mixed liquid to flow down along the inner peripheral wall 25 of the oil / water separation container 20 in a laminar flow state.
The downflow mechanism 5 includes an annular retention chamber 51 in which the mixed liquid supplied from the discharge pipe 11 stays and a slit-shaped downflow port 52 along the inner peripheral wall 25. The mixed liquid adheres to the inner peripheral wall 25 from the downflow port 52. Laminar flow.

In this embodiment, a cylindrical body 56 consisting of a small-diameter upper cylindrical portion 53, an annular flat plate portion 54, and a large-diameter cylindrical portion 55.
Is fixed to the upper portion of the oil / water separation container 20 to form the flow-down mechanism 5. The slit-shaped outlet 52 is
In this embodiment, the width is 5.0 mm and the length is 3 at three equal intervals.
Although arc-shaped slits of 0 to 40 mm are dispersedly formed, they may be dispersedly formed at four or more places, or the entire circumference may be slits. The width and length of the slits forming the flow-out port 52 are appropriately set depending on the amount of the mixed liquid and the properties of the oil.

A partition plate 6 that divides the oil / water separation container 20 into upper and lower parts is attached to an intermediate portion of the oil / water separation container 20. The partition plate 6 has a truncated cone shape, and a separated water downflow hole 61 is formed in the center which is the top.
A non-woven mat 62 made of ABS resin fiber is placed on the above. The partition plate 6 has an oil / water separation chamber 63 for the oil / water mixture.
And the lower part is a separation water chamber 64. A drain pipe 14, which is a water outlet, is connected to the bottom plate of the oil / water separation container 20. On the upper side wall of the oil / water separation container 20, an oil drain plug 15 which is an oil outlet and an oil surface visualizing window 16 are provided.

The partition plate 6 has the function of causing the mixed liquid flowing down along the inner peripheral wall 25 to flow up to the center with less disturbance, and the mat 62 imparts resistance to the water flow to gradually reduce the flow velocity. It has the function of For this reason, it is important that the inclination angle α of the partition plate 6 is in the range of 10 to 30 degrees, and that the mat 62 has a rough mesh so that the mixed solution easily permeates. The oil-water separation chamber 63 contains the oil-water mixture flowing down from the downflow port 52 at a predetermined level, and the oil layer 10 floats on the oil-water mixture.

The water purification device 3 has an oil-water separation container 20 on the upper surface.
It is composed of a cylindrical water purification container 30 set at a predetermined position lower than the liquid surface level and an oil adsorbent 31 housed in the water purification container 30. In the water purification container 30, a bottom plate 32 is formed in an inverted conical shape, and a cylindrical drain port 33 is provided at the center. A bottom plate 34 made of punching metal is installed at the bottom of the water purification container 30.

In this embodiment, the oil adsorbent 31 is made of a cloth bag containing charcoal such as pine from the viewpoint of cost reduction. However, any oil adsorbent 31 can be used as long as it can adsorb fine oil. Good. The drain pipe 14 is arranged so as to penetrate through the ceiling of the water purification container 30, and the shower port 35 is attached to the tip thereof. The separated water in the separated water chamber 64 is the oil / water separation container 20.
The siphon action due to the difference in level between the liquid level inside and the shower port 35 flows through the drain pipe 14 and is sprayed from the shower port 35 into the water purification container 30.

The liquid pump 4 is, as shown in FIG. 2, a cam rotor 4 connected to an output shaft of a motor 41 including a speed reduction mechanism.
2, a cam groove 43 formed on the outer periphery of the cam rotor 42, and a rod 46 to which a slider 44 slidably fitted in the cam groove 43 is fixed at one end and a piston 45 is connected to the other end. The piston 45 is slidably fitted in a cylinder 70 provided in the pump body 7.

A discharge chamber 71 and a suction chamber 72 are provided above and below the cylinder 70 in the pump body 7. Pump chambers 73 and 74 are provided on both sides of the piston 45 of the cylinder 70, and suction valves 75 and 7 are provided in the pump chambers 73 and 74, respectively.
6 and discharge valves 77, 78 are provided. Discharge chamber 7
Reference numeral 1 is connected to a discharge pipe 11 for an oil / water mixture, and a suction chamber 72 is connected to a bilge water reservoir 17 via a suction pipe 18.

In the liquid pump 4, the cam rotor 42 is rotated by the motor 41 and the reciprocating linear movement of the rod 46 causes the mixed liquid to be alternately sucked into the pump chambers 73 and 74 from the suction chamber 72 and discharged to the discharge chamber 71. At this time, it is important that the oil-water mixture is not disturbed as much as possible. The disturbance causes emulsification of oil-water, which delays separation of oil-water due to difference in specific gravity and surface tension.

Therefore, the axial flow type or centrifugal type pump is unsuitable, and it is desirable to operate the horizontally opposed positive displacement pump at a low speed. Further, the oil-water mixed liquid discharged from the pump chambers 73 and 74 can be changed less in discharge pressure and discharge amount as compared with a reciprocating pump having a single pump chamber, so that the oil-water mixed liquid is less emulsified. There are advantages.

From the discharge pipe 11 to the annular retention chamber 5 of the flow-down mechanism 5.
The mixed liquid supplied to No. 1 flows down (attaches) along the inner peripheral wall 25 of the oil-water separation container 20 from the slit-shaped flow-out port 52, and the oil-water located on the upper part of the partition plate 6 in the oil-water separation container 20. It stays in the separation chamber 63. The reason why the mixed liquid is made to flow along the inner peripheral wall 25 is to reduce the flow velocity and to drop in a laminar flow state as much as possible to reduce the disturbance and prevent the oil from becoming fine particles and becoming an emulsion.

The separation water chamber 64 located in the lower part of the partition plate 6 in the oil / water separation container 20 contains the separated water from which the oil has been separated, and the upper part thereof contains the mixed liquid during the oil / water separation. The oil layer 10 floats on the mixed liquid. Oil layer 1
0 has a function of separating oil from the oil-water mixture, and has a thickness of about 3 to 10 cm.

When the mixed liquid that has flowed down passes through the oil layer 10, some of the oil droplets are directly sucked into the oil layer 10, but most of it drops to the vicinity of the partition plate 6 and is centered along the partition plate 6. Reflux to above. The frusto-conical surface of the partition plate 6 has the function of smoothly refluxing the dropped mixed liquid above the central portion.

The oil droplets in the mixed liquid which have refluxed upward in the oil / water separation chamber 63 rise due to the buoyancy due to the difference in specific gravity and are sucked into the oil layer. At this time, if the oil droplets are too small, the buoyancy is also small, so it takes time to reach the oil layer 10. If the mixed solution is an emulsion (emulsion), it takes an extremely long time, so it is important to prevent emulsification as much as possible for smooth oil-water separation.

The thickness of the oil layer 10 to which oil droplets are added increases and reaches the position of the oil sensor 13 when the oil sensor 13 is reached.
Since an alarm device (not shown) is activated by the output of, the oil drain plug 15 is opened to drain oil. Note that the oil drain plug 15 may be opened by visually recognizing it through the oil level viewing window 16, or an automatic valve may be used for the oil drain plug 15 to automatically drain oil.

The separated water is used as a separated water downflow hole 6 of the partition plate 6.
From 1 to the lower separation water chamber 64, it is discharged from the drain pipe 14. At this time, the fine oil droplets still contained in the separated water float upward along the conical surface of the partition plate 6 and enter the oil / water separation chamber 63 from the separated water flow-down hole 61, so that the separation of the oil / water is promoted. To be done.

By combining the oil / water separator 2 and the liquid pump 4, the oil content in the waste water can be purified to about 0.3 ppm. The water in the drain pipe 14 flows into the water purification device 3 and is sprayed on the charcoal. Adsorbed on charcoal and oil content is 0.0
Since it is purified to 2 to 0.04 ppm, the environmental standard can be sufficiently achieved even if the waste water is directly fed to the discharge passage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an oil / water separator.

FIG. 2 is a sectional view of a liquid pump.

[Explanation of symbols] 1 water purification device 2 Oil-water separator 3 Water purification device 4 Liquid pump 5 Downflow mechanism 6 partition boards 7 Pump body 10 oil layer 14 Drain pipe (water outlet) 15 Oil drain plug (oil outlet) 20 oil-water separation container 25 Inner wall 30 water purification container 31 Oil adsorbent (adsorbent) 41 motor 42 cam rotor 43 Cam groove 44 Slider 45 pistons 46 rod 61 Separated water flow pilot hole 73 Pump room 74 Pump room 75 Suction valve 76 suction valve 77 Discharge valve 78 Discharge valve

Claims (4)

[Claims] 1. An oil / water separation container having an oil / water mixed liquid supplied to an upper end thereof, an oil outlet provided at an intermediate part thereof, and a water discharge port provided at a lower end thereof, and an upper end of the oil / water separation container. Installed along the inner wall,
A flow-down mechanism that causes the oil-water mixed liquid to flow down along the inner peripheral wall, a partition plate that is provided below the oil outlet of the oil-water separation container and that has a separation-water flow hole, and an upper part of the partition plate in the oil-water separation container. And an oil layer floating on top of the oil-water mixture. 2. The oil / water separator according to claim 1, wherein the partition plate has a truncated cone shape, and the separated water flow hole is formed at the top of the partition plate. 3. A liquid pump for sucking the oil-water mixture from a storage part for the oil-water mixture to supply the oil-water mixture to the upper end of the oil-water separation container, the oil-water separator according to claim 1 or 2, A water purification device that is provided in a discharge water channel connected to a discharge port and includes a purification container that contains an adsorbent inside. 4. The water purifier according to claim 3, wherein the liquid pump includes a motor, a rotor connected to an output shaft of the motor and provided with a cam groove on an outer periphery, and the cam groove at one end. A rod in which a slider that is slidably fitted is fixed and a piston is connected to the other end, a cylinder in which pump chambers are provided on both sides and the piston slides, and suction ports provided in each pump chamber A water purification device comprising a valve and a discharge valve.