Oil / Water Separation System

Abstract

To provide an oil-water separation system capable of efficiently drawing even a massive oil content or oil content present at a distant position and recovering them.SOLUTION: An oil-water separation system 1 includes: a collection container 5 having a cylindrical container body 3 having a discharge port 3a for sucking and discharging an oil-containing liquid F1 in a lower part and a cylindrical floating cylinder body 4 with an inner peripheral surface movable in a vertical direction along an outer peripheral surface of the container body, the cylindrical floating cylinder body having a suction part 4a for the oil-containing liquid in an upper part and capable of forming an air reservoir 4b; and a water suction pump 6 for sucking the oil-containing liquid from the discharge port of the container body of the collection container and floating the floating cylinder body from a surface of the oil-containing liquid by reciprocating the floating cylinder body in the vertical direction relative to the container body. The suction part of the floating cylinder body is formed in a conical shape which is open upward and gradually reduces in opening diameter as it goes down, and a difference between an outer diameter of the container body and an inner diameter of the floating cylinder body can be set to 1 mm or less. A valve 12a for adjusting suction force of the water suction pump can be provided in an outlet side pipe of the water suction pump.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an oil-water separation system, and more particularly to a system used to recover the upper layer of oil-water containing floating oils and fats in an oil-water separation tank such as a grease trap. [Background technology]

[0002] Wastewater from kitchens such as restaurants contains grease, leftover food, vegetable scraps, etc. Grease traps are installed to prevent these from clogging drains and drainage pipes, and to prevent them from flowing directly into the sewer. Grease traps temporarily store wastewater so that the grease and other wastewater does not flow directly into the sewer system. If wastewater is left stored in these traps, it can lead to bad odors and the growth of harmful insects.

[0003] Therefore, Patent Document 1 describes an oil-water separation system that includes a collection vessel that uses a suction means to suction and collect the oil-containing liquid in an oil-water mixture, and an oil-water separation means that separates the oil and water in the oil-containing liquid collected in the collection vessel, the collection vessel being composed of a bottomed cylindrical vessel body having an outlet at the bottom for suctioning and discharging the oil-containing liquid, and a floating cylinder that is fitted and arranged in the vessel body at a predetermined interval so as to be movable up and down, and a float that floats the floating cylinder near the liquid surface of the oil-water mixture is integrally provided with the floating cylinder, so that the oil that floats on the surface of the oil-water mixture can be well collected without air being mixed in. In addition to this oil-water separation system, there is also a device that uses a pair of spherical floats to suction oil with a floating cylinder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-154202 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the oil-water separation system described in Patent Document 1 above, the opening of the floating cylinder that sucks up the oil is fixed at a position slightly lower than the liquid level of the oil-water mixture, which causes problems such as oil clumps getting caught in the opening of the floating cylinder and the inability to attract oil that is far from the opening, resulting in low recovery efficiency.

[0006] Therefore, the present invention has been made in consideration of the problems in the above-mentioned conventional technology, and aims to provide an oil-water separation system that can efficiently attract and recover even clumped oil or oil located far away. [Means for solving the problem]

[0007] In order to achieve the above-mentioned objective, the oil-water separation system of the present invention is characterized in that it comprises a collection container having a cylindrical container body having an outlet at the bottom for sucking and discharging oil-containing liquid, and a cylindrical floating cylinder whose inner surface is arranged so as to be movable in the vertical direction along the outer peripheral surface of the container body, has an oil-containing liquid suction section at its upper part, and can form an air pocket, and a water suction pump that sucks oil-containing liquid from the outlet of the container body of the collection container and reciprocates the floating cylinder in the vertical direction relative to the container body to raise and lower it from the surface of the oil-containing liquid.

[0008] According to the present invention, the floating cylinder moves up and down and floats on and off the surface of the oil-containing liquid, so that even clumps of oil or oil located far away can be efficiently attracted and recovered.

[0009] In the above oil-water separation system, the suction section of the floating cylinder can be formed in a mortar shape that opens upward and gradually decreases in opening diameter as it descends. This allows the sucked oil-containing liquid to be quickly guided to the container body.

[0010] In the above oil-water separation system, the difference between the outer diameter of the container body and the inner diameter of the floating cylinder can be set to 1 mm or less, which allows stable sliding between the container body and the floating cylinder and balances the water pressure difference between the inside and outside of the collection container.

[0011] In the above oil-water separation system, a valve for adjusting the suction power of the suction pump can be provided on the piping on the outlet side of the suction pump, thereby making it possible to adjust the range of the up-down reciprocating motion of the floating cylinder according to the properties of the oil-containing liquid. Effect of the Invention

[0012] As described above, according to the present invention, an oil-water separation system can be provided that can efficiently attract and recover even clumps of oil or oil located far away. [Brief description of the drawings]

[0013] [Figure 1] 1 is an overall configuration diagram showing one embodiment of an oil-water separation system according to the present invention. [Diagram 2] 2 is a partial cross-sectional view showing a collection vessel, a water intake pump, etc. of the oil-water separation system shown in FIG. 1. [Diagram 3] This is a diagram mainly for explaining the operation of the collection vessel shown in Figure 2, in which (a) shows the floating cylinder in its initial position, (b) shows the suction part of the floating cylinder submerged below the water surface, and (c) shows the suction part of the floating cylinder floating above the water surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Figure 1 shows one embodiment of the oil-water separation system of the present invention. This oil-water separation system 1 comprises a grease trap 7 equipped with a collection container 5 and a water suction pump 6, etc., an oil-water separation tank 9 for storing oil-containing liquid F1 (F2) recovered in the grease trap 7, an oil-water transfer pump (hereinafter referred to as the "transfer pump") 10 for recovering oil-rich oil-water F3 remaining on the surface of the oil-water separation tank 9 and transporting it to an oil-water recovery tank 11, and an operation panel 8 for controlling the drive of the water suction pump 6 and the transfer pump 10, etc.

[0015] The grease trap 7 receives wastewater D from a kitchen of a restaurant or the like, and is equipped with a basket 2 for collecting food scraps, vegetable scraps, etc. contained in the wastewater D, a collection container 5 for collecting oil-containing liquid F1, and a suction pump 6.

[0016] As shown in Figure 2, the inlet side of the suction pump 6 is connected to a collection container 5 having a cylindrical container body 3 having a discharge port 3a at the bottom for suction and discharge of the oil-containing liquid F1, and a cylindrical floating cylinder 4 whose inner surface is arranged so as to be movable in the vertical direction along the outer peripheral surface of the container body 3, has a suction section 4a for the oil-containing liquid F1 at its upper part, and is capable of forming an air reservoir 4b.

[0017] The suction section 4a of the floating cylinder 4 of the collection vessel 5 is formed in a cone shape that opens upward and the opening diameter gradually decreases as it descends. The difference between the outer diameter of the vessel body 3 and the inner diameter of the floating cylinder 4 is set to 1 mm or less. A cylindrical section 4c is provided at the bottom of the suction section 4a.

[0018] A valve 12 a for adjusting the suction power of the suction pump 6 is provided on the piping 12 on the outlet side of the suction pump 6 .

[0019] 1, an oil suction pipe 10a of a transfer pump 10 is erected inside the oil-water separation tank 9. Also provided inside the oil-water separation tank 9 are an oil-water partition pipe 9a having a notch at its bottom and a drain pipe 9b that opens below the water surface inside the oil-water partition pipe 9a, and provided at the bottom of the oil-water separation tank 9 is a drain pipe 9c equipped with a drain valve (not shown) for returning water accumulated at the bottom to the grease trap 7. The oil-water separation tank 9 and the oil and grease recovery tank 11 are connected at their bottoms by a communication pipe 13.

[0020] In addition to the above-mentioned devices, the oil-water separation system 1 is appropriately equipped with valves for tap water used during oil and grease recovery, maintenance, and cooling.

[0021] Next, the operation of the oil-water separation system 1 having the above configuration will be described with reference to FIGS.

[0022] Wastewater D from a kitchen such as a restaurant is poured into a grease trap 7, and food scraps, vegetable scraps, etc. contained in the wastewater D are collected by a basket 2. Next, oil-containing liquid F1 on the water surface of the grease trap 7 is collected by a collection container 5 and a water suction pump 6. By operating the water suction pump 6 about 20 times a day, for about two minutes each time, the inside of the grease trap 7 can be kept constantly clean.

[0023] The operation of recovering the oil-containing liquid F1 by the collection vessel 5 and the water suction pump 6 will now be described in detail.

[0024] When the suction pump 6 is stopped, as shown in Fig. 3(a), the suction part 4a of the floating cylinder 4 of the collection vessel 5 is located about 1 cm above the water surface S of the grease trap 7 due to the buoyancy of the air remaining in the air reservoir 4b. The floating height of the suction part 4a of the floating cylinder 4 is controlled by adjusting the length of the cylindrical part 4c and thereby adjusting the amount of air remaining in the air reservoir 4b.

[0025] When the suction pump 6 is driven, as shown in Figure 3(b), the suction force of the suction pump 6 becomes greater than the buoyancy of the floating cylinder 4 of the collection container 5, causing the floating cylinder 4 to move downward along the container body 3, the suction part 4a of the floating cylinder 4 to sink below the water surface, and the oil-containing liquid F1 near the water surface of the grease trap 7 is sucked in by the suction pump 6.

[0026] As suction by the suction pump 6 continues, the water level in the collection vessel 5 drops and the suction pump 6 begins to suck in air along with the oil-containing liquid F1, causing the buoyancy of the floating cylinder 4 to exceed the suction force of the suction pump 6, causing the suction part 4a of the floating cylinder 4 to rise above the water surface as shown in Figure 3(c). After that, the suction part 4a of the floating cylinder 4 repeatedly rises and sinks below the water surface S, and when the suction pump 6 stops, it returns to the state shown in Figure 3(a).

[0027] In this way, the suction part 4a of the floating cylinder 4 reciprocates vertically, repeatedly rising and sinking from the water surface S, and by sinking the suction part 4a of the floating cylinder 4 to a certain extent, the oil clumps do not get caught in the suction part 4a and can be effectively collected. Also, by the suction part 4a of the floating cylinder 4 repeatedly rising and sinking from the water surface S, the water surface S pulsates, attracting the floating oil and fat that is far from the suction part 4a and allowing it to be effectively collected.

[0028] In addition, since the suction section 4a of the floating cylinder 4 of the collection vessel 5 is formed in a mortar shape with the opening diameter gradually decreasing as it descends, the sucked oil-containing liquid F1 can be quickly guided to the vessel body 3. Furthermore, since the difference between the outer diameter of the vessel body 3 and the inner diameter of the floating cylinder 4 is set to 1 mm or less, the vessel body 3 and the floating cylinder 4 can slide stably in sliding contact with each other, and the water pressure difference between the inside and outside of the collection vessel 5 can be balanced.

[0029] Furthermore, when the size of the semi-solid matter in the oil-containing liquid F1 is relatively large, the suction force of the suction pump 6 is increased slightly by adjusting the valve 12a of the outlet piping 12 of the suction pump 6, thereby increasing the range of the up and down reciprocating movement of the floating cylinder 4. Conversely, when the size of the semi-solid matter in the oil-containing liquid F1 is relatively small, the suction force of the suction pump 6 is decreased slightly by adjusting the valve 12a, thereby decreasing the range of the up and down reciprocating movement of the floating cylinder 4, thereby enabling the oil-containing liquid F1 to be sucked up efficiently according to the size of the semi-solid matter.

[0030] The oil-containing liquid F1 recovered by the suction pump 6 is transported via the outlet piping 12 to the oil-water separation tank 9 (oil-containing liquid F2), and the transport pump 10 recovers oil-rich oil-water F3 floating on the water surface in the oil-water separation tank 9 and transports it to the oil recovery tank 11.

[0031] Meanwhile, the water separated in the oil-water separation tank 9 is returned to the grease trap 7 via the oil-water partition pipe 9a and the drain pipe 9b. The top of the oil-water partition pipe 9a is slightly higher than the water level in the oil-water separation tank 9, and the oil-water partition pipe 9a has a notch at the bottom, so the inside of the oil-water partition pipe 9a is filled with water with little oil content. If the oil-water partition pipe 9a did not exist, the oil on the water surface would also be discharged when draining the water from the oil-water separation tank 9, but the presence of the oil-water partition pipe 9a makes it difficult to discharge the oil on the water surface of the oil-water separation tank 9. In addition, when cleaning and maintaining the oil-water separation tank 9, the wastewater in the oil-water separation tank 9 is drained from the drain pipe 9c. The drain pipe 9b determines the water level (amount of water) of the wastewater that accumulates in the oil-water separation tank 9 and the grease recovery tank 11.

[0032] Of the oil-rich oil-water F4 recovered in the oil-and-grease recovery tank 11, the oil-and-grease F5 accumulates in the upper layer of the oil-and-grease recovery tank 11, and the separated water W is stored below it. The separated water W is returned to the oil-water separation tank 9 via the communicating pipe 13. By constantly operating the transfer pump 10 and circulating the oil-and-water F3 between the oil-and-water separation tank 9 and the oil-and-grease recovery tank 11, the separation efficiency of the oil-and-grease F5 and the water W can be increased, and a large amount of the oil-and-grease F5 can be recovered and stored in the oil-and-grease recovery tank 11.

[0033] In the above embodiment, the oil-water separation tank 9 and the grease recovery tank 11 are provided downstream of the grease trap 7, and the grease F5 is finally recovered in the grease recovery tank 11, but the grease may be recovered in the oil-water separation tank 9 without providing the grease recovery tank 11. Also, a simple oil-water separation system consisting of only the grease trap 7 can be constructed by providing a cylindrical recovery section with an open bottom inside the grease trap 7 and storing the recovered grease in this recovery section.

[0034] Furthermore, although the suction pump 6 is installed in the water of the grease trap 7, a vacuum pump or the like can also be installed outside the grease trap 7 to suck up the oil-containing liquid F1. The number of collection vessels 5 is not limited to one, and two or more may be provided. The shape of the suction section 4a of the floating cylinder 4 of the collection vessel 5 is not limited to a mortar shape, and other shapes may be used, and other configurations of the floating cylinder 4 are not limited to the illustrated example. Furthermore, although a valve 12a is provided in the piping 12 on the outlet side of the suction pump 6 to adjust the range of the up-down reciprocating motion of the floating cylinder 4, the adjustment means is not limited to this. [Explanation of symbols]

[0035] 1. Oil-water separation system 2. Basket 3 Container body 3a Outlet 4 Floating cylinder 4a Suction part 4b Air pocket 4c Cylindrical section 5. Collection vessel 6. Suction pump 7. Grease trap 8 Control panel 9. Oil / water separation tank 9a Oil / water partition pipe 9b Drain pipe 9c Drain pipe 10 Oil and water conveying pump 10a oil absorption pipe 11 Grease recovery tank 12 Outlet side piping 12a Valve 13 Communication pipe D Drainage F1, F2 oily liquid F3, F4: There is too much oil and water in the oil. F5 Grease S Water surface W Water

Claims

1. a collecting vessel having a cylindrical vessel body with a discharge port at the bottom for suctioning and discharging the oil-containing liquid, and a cylindrical floating cylinder whose inner circumferential surface is arranged to be movable in the vertical direction along the outer circumferential surface of the vessel body, and which has an oil-containing liquid suction section at its upper portion and can form an air pocket; An oil-water separation system characterized by comprising a suction pump that sucks oil-containing liquid from the outlet of the container body of the collection container and moves the floating cylinder back and forth in an up and down direction relative to the container body to float it above and below the surface of the oil-containing liquid.

2. 2. The oil-water separation system according to claim 1, wherein the suction portion of the floating cylinder is formed in a mortar shape that opens upward and the opening diameter gradually decreases as it descends.

3. 3. An oil-water separation system as described in claim 1 or 2, characterized in that the difference between the outer diameter of the container body and the inner diameter of the floating cylinder is 1 mm or less.

4. 4. An oil-water separation system as claimed in claim 1, 2 or 3, characterized in that a valve for adjusting the suction power of the suction pump is provided in the piping on the outlet side of the suction pump.

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