Separation device

Abstract

Provided is a separation device that can reliably separate insoluble solids and can be stably used over a long period of time. The separation device for separating solids contained in an inflowing liquid comprises: a separation tank; a partition plate for partitioning the inside of the separation tank into an inflow chamber and an outflow chamber; a screen provided on the partition plate and provided with a plurality of holes; an inflow part formed in the inflow chamber; and a discharge part formed in the outflow chamber. The inflow chamber is provided with a swirl guide part for inverting the liquid flowing in from the inflow part and forming a vertical swirl flow in the inflow chamber. The screen is arranged along a side surface of the formed swirl flow, and the screen is surface-treated with a satin finish.

Description

Separation device

[0001] The present invention relates to a device for separating solids contained in wastewater flowing through a sewer pipeline, liquids flowing through wastewater treatment facilities in factories, etc., and circulating water used in agriculture, aquaculture, etc.

[0002] In recent years, water shortages are predicted to become serious on a global scale, and as a countermeasure, the recycling of rainwater, factory wastewater, etc. is being emphasized. For example, drainage such as rainwater flowing into the sewer is stored or discharged by rainwater storage and infiltration facilities, etc., and the rest is discharged into rivers.

[0003] However, insoluble solids such as sediment, fallen leaves, and other garbage are mixed in the drainage such as rainwater. When these insoluble solids flow into the rainwater storage and infiltration facilities, it is necessary to frequently perform maintenance of the facilities. In addition, when discharging from the rainwater storage and infiltration facilities into the river, solids are also discharged into the river at the same time, resulting in problems such as water pollution and environmental pollution of the river. Therefore, a drainage separation device for separating solids is provided in a part of the sewer.

[0004] Currently, the general treatment process for wastewater, for example, undergoes screen treatment using a bar screen or the like, sedimentation separation treatment, floating filtration by aeration, oil and fat separation, etc., and then advanced treatment membrane treatment. In water treatment, from the perspective that it is important to capture as many insoluble solids as possible on the upstream side (i.e., the pretreatment side) of the treatment, the development of a screen treatment mechanism that can reliably capture insoluble solids and does not clog has been demanded.

[0005] For example, in Patent Document 1 and Patent Document 2, two screens with holes are installed in parallel with respect to the flow of wastewater flowing into the separation layer, and a swirling flow (swirl) that swirls along the screen surface is generated by the flowing-down energy of the wastewater, and a separation device that separates solids by the swirling flow is disclosed. In this separation device, solids larger than the screen holes continue to swirl without passing through the holes, and only water and solids smaller than the holes pass through the screen holes, so that solids can be efficiently separated.

[0006] Japanese Patent No. 4395190 Japanese Patent No. 4668290

[0007] However, with the separation apparatus described in the above-mentioned literature, clogging of the screen pores sometimes occurred depending on the properties of the insoluble solids.

[0008] Therefore, the present invention aims to provide a separation device that can reliably separate insoluble solids and can be used stably over a long period of time.

[0009] To achieve the above objective, the present invention provides a separation device for separating solid matter contained in an incoming liquid, comprising: a separation tank; a partition plate that divides the inside of the separation tank into an inlet chamber and an outlet chamber; a screen provided on the partition plate and having a plurality of holes; an inlet section formed in the inlet chamber; and an outlet section formed in the outlet chamber, wherein the inlet chamber is provided with a swirling guide section for reversing the liquid flowing in from the inlet section to form a vertical swirling flow inside the inlet chamber; the screen is arranged to follow the side surface of the formed swirling flow; and the screen is surface-treated by a matte finish.

[0010] According to one embodiment of the present invention, a separation apparatus can be provided that can reliably separate insoluble solids and can be used stably over a long period of time.

[0011] Figure 1 is a schematic top view of an example of a separation apparatus according to this embodiment. Figure 2 is a schematic front view of an example of a separation apparatus according to this embodiment. Figure 3A is a schematic photograph illustrating the state of the holes in the screen before texture processing. Figure 3B is a magnified photograph of Figure 3A. Figure 4A is a schematic photograph illustrating the state of the holes in the screen after texture processing. Figure 4B is a magnified photograph of Figure 4A. Figure 5A is a schematic diagram illustrating the reason why texture processing improves screen performance, showing the relationship between the screen before texture processing and solid matter and oil. Figure 5B is a schematic diagram illustrating the reason why texture processing improves screen performance, showing the relationship between the screen after texture processing and solid matter and oil.

[0012] Hereinafter, a separation device according to one embodiment of the present invention, specifically the best embodiment, will be described with reference to the drawings.

[0013] (Example 1 - Best Configuration of the Separation Device) Figure 1 shows a schematic top view of an example of the separation device according to this embodiment, and Figure 2 shows a schematic front view. In Figures 1 and 2, for the sake of simplicity, the first swirling flow region R1 and the second swirling flow region R2, which will be described later, are schematically shown with dotted lines, and the first retention region R3, the second retention region R4, the third retention region R5, and the fourth retention region R6 are schematically shown with dashed lines. In this embodiment, an example in which two swirling flow regions are formed is described as the best embodiment, but the present invention is not limited in this respect and can be applied even when one or more swirling flow regions are formed.

[0014] As shown in Figures 1 and 2, the separation device 1 according to this embodiment includes a separation tank 2, a partition plate 5 that divides the inside of the separation tank 2 into an inlet chamber 3 and an outlet chamber 4, a screen 6 placed on the partition plate 5, and a divider 10 that divides the inlet chamber 3 into a first chamber 7, a second chamber 8, and a third chamber 9 from the upstream side.

[0015] The separation tank 2 is typically the housing of the separation device 1, constructed from materials such as reinforced concrete, metal, or fiber-reinforced plastic. Normally, the top of the separation tank 2 is open, and during the separation process, it is closed with a retractable lid, such as a steel plate.

[0016] An inlet section 11, which is a through-hole for allowing liquid to flow into the separation tank 2, is formed on the wall side of the first chamber 7 of the inlet chamber 3, and an outlet section 12, which is a through-hole for allowing liquid to flow out of the separation tank 2, is formed on the wall side of the outlet chamber 4 opposite the inlet section 11 of the separation tank 2. Typically, the inlet section 11 and the outlet section 12 are located on the upper side of the separation layer 2.

[0017] Furthermore, a floating matter discharge section 13 is provided above the third chamber 9 of the inlet chamber 3. This floating matter discharge section 13 discharges floating solid matter and oil, while preventing them from flowing downstream from the outlet section 12.

[0018] The partition plate 5 divides the inside of the separation tank 2 into an inlet chamber 3 and an outlet chamber 4, and is made of a material such as corrosion-resistant metal or fiber-reinforced plastic. A screen 6 is also placed on this partition plate 5 (see Figure 1, etc.).

[0019] The inlet chamber 3 is provided with a divider 10 that divides it into a first chamber 7, a second chamber 8, and a third chamber 9 from the upstream side. The divider 10 is made of a material such as steel, FRP, polyethylene or other resins, or concrete.

[0020] The first chamber 7 is configured to smoothly lower the liquid supplied from the inlet 11 of the inlet chamber 3 and to smoothly generate a vertical swirling flow in the first swirling flow region R1 within the second chamber 8, which is connected to the first chamber 7 via a first opening 14 provided on the lower end side of the swirling guide section 10a of the divider 10 that separates the first chamber 7 and the second chamber 8. For this reason, the lower side of the swirling guide section 10a is configured to have an arc-shaped curve. Some of the floating solids, which have a specific gravity less than 1 (or less than or equal to 1), float in the first retention region R3 that is generated above the inlet 11. These floating solids can be discharged from the floating material discharge section 13 by increasing the amount of inflow water or decreasing the amount of outflow water, thereby raising the water level in the inlet chamber 3 and moving them to the third retention region R5, which will be described later. For this reason, the first chamber 7, the second chamber 8, and the third chamber 9 are connected in the upper part of the inlet chamber 3. Furthermore, the discharge of floating solids and oil from the floating discharge section 13 may be configured to be performed automatically using a water level gauge, automatic on / off valve, automatic timer, etc. (not shown), in the manner described above.

[0021] The second chamber 8 primarily serves to separate settling solids with a specific gravity greater than (or greater than) 1. An opening 15 is provided below the second chamber 8, and most of the settling solids with a specific gravity greater than 1 fall through the opening 15 and accumulate in the first settling section (corresponding to the second retention area R4) before being discharged from the first settling discharge section 16. This allows for the separation of most of the settling solids from the liquid.

[0022] The upper side of the second chamber 8 and the upper side of the third chamber 9 are connected by a second opening 17 formed by the upper end of the swirling guide section 10a and the upper end of the flow control section 10b. The upper sides of the swirling guide section 10a and the flow control section 10b are configured to have an arc-shaped curve so as to smoothly generate a vertical swirling flow in the second swirling flow region R2 within the third chamber 9. In the example shown in Figure 2, the swirling guide section 10a is also provided in the lower part of the third chamber 9, near the wall on the outlet chamber 4 side, to smoothly generate a vertical swirling flow. In Figure 2, the swirling guide section 10a performs a part of the function of the flow control section 10b, and the flow control section 10b also performs a part of the function of the swirling control section 10a.

[0023] The third chamber 9 primarily serves to separate floating solids and oils with a specific gravity less than (or less than) 1, and a third retention area R5 is formed above the third chamber 9. The floating solids and oils that remain in the third retention area R5 and the aforementioned first retention area R3 are then discharged from the floating discharge section 13 by the method described above. In Figure 2, for the sake of explanation, only one first retention area R3 and one third retention area R5 are shown, but it is also possible to have a configuration in which one or more first retention areas R3 are formed on the first chamber 7 and one or more third retention areas R5 are formed on the third chamber.

[0024] Furthermore, even solids with a specific gravity greater than 1 often float and swirl in the swirling region. When these floating solids are carried downwards by the vertical swirling flow in the second swirling flow region R2, they accumulate in the second settling section (corresponding to the fourth retention region R6) formed below the third chamber 9, then sink under their own weight and are discharged from the second settling discharge section 18 located below the third chamber 9. The discharge of settling solids and floating solids from the first settling discharge section 16 and the second settling discharge section 18 may also be automated using automatic opening and closing valves, automatic timers, etc. (not shown).

[0025] The screen 6 is provided at two opposing edges of the partition 9 in the width direction, that is, in a direction perpendicular to the axis connecting the inlet 11 side and the outlet 12 side, at positions corresponding to at least the first swirling flow region R1 of the second chamber 8 and the second swirling flow region R2 of the third chamber 9. In Figure 1, etc., the screen 6 is shown as screen 6a at the position corresponding to the first swirling flow region R1 and screen 6b at the position corresponding to the second swirling flow region R2. As a result, the screen 6 is positioned along the sides of the swirling flow formed in the first swirling flow region R1 and the second swirling flow region R2.

[0026] In this embodiment, the screen 6 is a screen made of a metal plate composed of a corrosion-resistant metal, more specifically stainless steel or titanium, with multiple holes of a predetermined size, and the surface is treated by a matte finish. The detailed configuration and effects of the screen 6 will be described in Example 2 below.

[0027] The size and area of ​​the screen 6a in the second chamber 8 and the screen 6b in the third chamber 9 are preferably designed to form a sufficient third retention area R5 above the third chamber 9. In this embodiment, the design allows 40% of the discharged material to pass through the screen 6 in the second chamber 8 and 60% to pass through the screen 6 in the third chamber 9.

[0028] The total opening area of ​​the holes in the screen 6 and the cross-sectional area of ​​the inlet 11 affect the flow velocity and stability of the swirling flow. It is preferable to design the total opening area of ​​the holes in the screen 6 so that the speed at which the liquid passes through the screen 6 is 1 / 10 or less, more preferably 1 / 20 or less, of the inflow velocity of the liquid flowing in from the inlet 11. By making the speed at which the liquid passes through the screen 6 1 / 2 or less of the inflow velocity of the liquid flowing in from the inlet 11, solid matter is more easily swept away by the swirling flow. In this embodiment, the total opening area of ​​the holes in the screen 6 was set to 15 times the cross-sectional area of ​​the inlet 11.

[0029] Furthermore, the pore ratio of the screen 6, that is, the ratio of the total area of ​​the pores of the screen 6 to the total area of ​​the screen 6, is preferably in the range of 10% to 25% (1 / 10 to 1 / 4). In conventional water treatment, the typical pore ratio is around 30% (3 / 10) to 60% (3 / 5) or more. However, in this embodiment, since the screen 6 is arranged along the side surface of the swirling flow formed in the first swirling flow region R1 and the second swirling flow region R2, the pore ratio can be reduced. By reducing the pore ratio, the area of ​​the non-open portion increases, which strengthens the hydrophilicity of the screen 6. This makes it difficult for oil to adhere to the screen 6 due to van der Waals forces, and also makes it easier for oil particles to bind to each other due to hydrophobic interactions, thus increasing the flotation separation effect and facilitating oil separation by the screen. In this embodiment, the pore ratio of the screen 6, that is, the ratio of the total area of ​​the pores of the screen 6 to the total area of ​​the screen 6, was set to 10% (1 / 10).

[0030] The separation apparatus according to this embodiment can separate even micron-order fine solids and oils, which have been considered difficult to separate without clogging the screen 6. In this embodiment, the pore diameter of the screen 6 is set to 1 mm or less. In this embodiment, many solids are carried along the side of the screen 6 by a swirling flow without passing through the pores, and the size of solids that can pass through is limited to about 1 / 3 to 1 / 4 of the pore diameter or less. That is, in this embodiment, it is possible to capture solids of about 300 to 250 μm (even smaller solids can be captured by adjusting the pore diameter of the screen 6).

[0031] A method for separating solid matter contained in a liquid using the separation device 1 described above will now be explained. In Figures 1 and 2, arrows are schematically added to illustrate examples of the direction of liquid movement in order to explain the path of the liquid within the separation device 1. The liquid supplied from the inlet 11 into the first chamber 7 of the inlet chamber 3 is guided downward by the swirling guide unit 10a and moves into the second chamber 8 through the first opening 14. The liquid that has moved into the second chamber 8 is guided upward by the flow control unit 10b. As a result, a swirling flow is generated in the vertical direction in the liquid within the second chamber 8.

[0032] Settling solids with a specific gravity greater than (or greater than) 1 fall through the opening 15 located on the lower side of the second chamber 8, accumulate in the first settling section (corresponding to the second retention area R4), and are then discharged from the first settling discharge section 16.

[0033] On the other hand, some of the liquid swirling vertically in the second chamber 8 flows out through the screen 6 to the outflow chamber 4. At this time, any solid matter contained in the liquid is captured on the surface of the screen 6 and separated without passing through.

[0034] A portion of the liquid swirling vertically in the first chamber 7 moves to the third chamber 9 through the second opening 17 located above the first chamber 7. The liquid that has moved into the third chamber 9 is guided downwards by the shape of the swirling guide section 10a and the flow control section 10b that form the second opening 17, as well as by the weight of the liquid itself. This generates a swirling flow in the vertical direction within the liquid in the third chamber 9.

[0035] Some of the suspended solids accumulate in the first retention area R3 that forms at the top of the first chamber 7, and the suspended solids that flow into the third chamber 9 accumulate in the third retention area R5 that forms at the top of the third chamber 9. By increasing the amount of inflowing water or decreasing the amount of outflowing water, the water level in the inflow chamber 3 rises, and the entire amount is moved to the third retention area R5 and discharged from the suspended solids discharge section 13.

[0036] Furthermore, even solids with a specific gravity greater than 1 often float and swirl in the swirling region. When these floating solids are carried downwards by the vertical swirling flow in the second swirling flow region R2, they accumulate in the second settling section (corresponding to the fourth retention region R6) formed below the third chamber 9, then sink under their own weight and are discharged from the second settling discharge section 18 located below the third chamber 9.

[0037] On the other hand, some of the liquid swirling vertically in the third chamber 9 flows out through the screen 6 to the outflow chamber 4. At this time, any solid matter contained in the liquid is captured on the surface of the screen 6 and separated without passing through.

[0038] (Example 2 - Effects of surface texture processing) Next, we will describe an example in which, by using a screen 6 that has multiple holes and is surface-treated by surface texture processing, it was confirmed that insoluble solids can be reliably separated and that the screen can be used stably over a long period of time.

[0039] First, in this embodiment, the screen used is not a wedge wire screen in which V-shaped wires are arranged in a grid pattern, but rather a screen with multiple holes, such as a perforated screen.

[0040] When a wedge wire screen is used, there are areas where the direction of the vertical swirling flow along the side of the screen flows in the direction of the straight mesh width between the V-shaped wires. As a result, solid matter can get trapped in these areas, causing the screen to clog. Therefore, in this embodiment, a screen with multiple holes, such as a perforated screen, is used instead of a wedge wire screen. As the screen with multiple holes, a commercially available perforated screen may be used, or a screen with a predetermined thickness may be used, which is made by diffusion bonding thin plates designed with predetermined hole diameters and aperture ratios by etching or the like.

[0041] Further, as described above, the screen 6 of the separation device according to the present embodiment is two opposing edge portions in the width direction of the divided body 9, that is, in a direction perpendicular to the axis connecting the inflow portion 11 side and the outflow portion 12 side, and is provided at positions corresponding to at least the first swirling flow region R1 of the second chamber 8 and the second swirling flow region R2 of the third chamber 9. Therefore, the outer peripheral shape of the screen provided with a plurality of holes may be circular or elliptical corresponding to the cross-sectional shape of the swirling flow, or may be rectangular, but from the viewpoint of handling properties such as attachment and removal during screen replacement, it is preferably circular or elliptical.

[0042] And in the present embodiment, a screen provided with a plurality of holes and surface-treated by satin finish is used. In the present embodiment, the satin finish refers to a process of processing the surface of a screen formed of a corrosion-resistant metal such as titanium or stainless steel into a surface with fine irregularities.

[0043] As a method of satin-finishing the screen, the method is not particularly limited as long as fine irregularities can be formed on the surface of the screen. For example, physical satin-finishing such as sandblasting treatment (sand mat treatment) or embossing treatment using an embossing roll having a satin surface may be employed, or chemical satin-finishing such as plasma treatment or chemical etching treatment may be employed.

[0044] FIG. 3 shows a schematic photograph for explaining the state of the holes of the screen before satin finish, and FIG. 4 shows a schematic photograph for explaining the state of the holes of the screen after satin finish. Note that FIG. 3B is an enlarged view of FIG. 3A, and FIG. 4B is an enlarged view of FIG. 4A. Further, as a sample, a stainless steel material (SUS304-2B material) with a plate thickness of 0.5 mm was used, and a sample provided with holes having a hole diameter of 1.0 mm using a punching press was used, and sandblasting treatment was employed as the satin finish.

[0045] As shown in Fig. 3A, the screen 19 as a stainless steel material before satin finishing has a damaged part on its surface, and its surface is a rough surface with irregularities generated during steelmaking or the like. Therefore, when using the screen before satin finishing, fibrous solids, solids with a soft surface, etc. in rainwater or factory wastewater may adhere to it.

[0046] Also, as shown in Fig. 3B, when forming the hole part 19a of the screen 19 as a stainless steel material before satin finishing, in order to press-fit the punch of the punching press machine, burrs are generated over the entire circumference of the hole part, and the fracture surface becomes a rough surface. Therefore, when using the screen before satin finishing, insoluble solids may get caught on this fractured rough surface and burrs, and clogging may occur.

[0047] On the other hand, as shown in Figs. 4A and 4B, the screen 6 as a stainless steel material after satin finishing has its surface rough surface improved by fine sandblasting (abrasive) to form uniform dimples (concavities and convexities), and the burrs around the hole part 6c and the rough surface of the fracture surface are also significantly improved.

[0048] The reason why the screen performance is improved by subjecting the screen to satin finishing will be described with reference to the drawings. Fig. 5 shows a schematic diagram for explaining the reason why the screen performance is improved by satin finishing. In particular, Fig. 5A shows a schematic diagram showing the relationship between the screen before satin finishing and solids and oil, and Fig. 5B shows a schematic diagram showing the relationship between the screen after satin finishing and solids and oil.

[0049] As described above, the separation device in the present embodiment forms a swirling flow in the vertical direction in the inflow chamber, and the screen is arranged along the side surface of the formed swirling flow. That is, as shown by the arrows in Fig. 5, the direction of the swirling flowing water is parallel to the surfaces of the screens 6 and 19.

[0050] As shown in Figure 5A, when a screen 19 without a textured surface is used, solid matter S in the liquid comes into surface contact with the screen 19, resulting in a larger contact area and making it easier for solid matter S to adhere to the screen 19. Furthermore, solid matter S adhering to the screen 19 is difficult to remove due to the shear force of the water flowing along the screen surface, which can cause clogging of the screen 19. Additionally, oil O in the liquid also tends to adhere to the rough surface of the screen 19, which can lead to the adhesion of insoluble solid matter.

[0051] On the other hand, as shown in Figure 5B, when a textured screen 6 is used, solid particles S in the liquid make point contact at multiple points on the apex of the protrusions on the surface of the screen 6, resulting in a smaller contact area and making it difficult for them to adhere to the screen 6. Furthermore, any solid particles S that do adhere to the screen 6 are easily removed by the shear force of the water flowing along the screen surface, so the solid particles S do not become fixed to the screen 6. In addition, water accumulates in the depressions on the screen surface, making it hydrophilic, so the van der Waals forces on oil particles O in the liquid are strengthened as the oil particles O are surrounded by water, preventing the oil particles O from becoming fixed to the surface. Moreover, hydrophobic interactions promote bonding between oil particles O, increasing the size of the oil particles O and thus increasing the buoyancy force, making it possible to capture the oil particles O by utilizing their flotation and separation. Furthermore, the textured finish also smooths the rough surface of the screen 6, making it difficult for fibrous solid particles such as hair and solid particles with soft surfaces to adhere to the screen 6 surface, thus reducing the likelihood of screen clogging.

[0052] In addition to textured finishes, several other methods are known for improving the rough surface and burrs around the holes of the screen. These include coating with fluororesin or ceramics, and mirror-finishing the surface through electrolytic polishing. However, with fluororesin coating, the coating thickness is relatively large, which can significantly block the screen's holes, making it difficult to achieve the desired hole diameter and opening area. Furthermore, the coating itself may peel off. With ceramic coating, the coating thickness can be reduced, but the adhesion to the screen body is poor, making it difficult to guarantee long-term screen performance due to coating peeling, etc. When the screen surface is mirror-finished by electrolytic polishing, the rough surface and burrs around the holes can be removed, but the increased frictional resistance makes it easier for solids to adhere to the surface, and they become less susceptible to being removed by the shear force of water flowing along the screen surface.

[0053] As described above, the separation device according to this embodiment is a separation device for separating solid matter contained in an incoming liquid, comprising: a separation tank; a partition plate that divides the inside of the separation tank into an inlet chamber and an outlet chamber; a screen provided on the partition plate and having a plurality of holes; an inlet section formed in the inlet chamber; and an outlet section formed in the outlet chamber, wherein the inlet chamber is provided with a swirling guide section for inverting the liquid flowing in from the inlet section to form a vertical swirling flow inside the inlet chamber; the screen is arranged to follow the side surface of the formed swirling flow; and the screen is surface-treated by a matte finish.

[0054] Therefore, solid particles in liquids make point contact at multiple points on the apex of the protrusions on the screen surface, resulting in a small contact area and making it difficult for them to adhere to the screen. Furthermore, any solid particles that do adhere to the screen are easily removed by the shear force of the water flowing along the screen surface, so solid particles do not become fixed to the screen. In addition, water accumulates in the depressions on the screen surface, making it hydrophilic, so even oil particles in liquids are surrounded by water, strengthening the van der Waals forces and preventing oil from adhering to the surface. Moreover, hydrophobic interactions promote the bonding between oil particles, increasing their size and thus their buoyancy, making it possible to capture oil by utilizing its flotation separation. Furthermore, the textured surface of the screen is smoothed and uneven by the matte finish, making it difficult for fibrous solid particles such as hair and solid particles with soft surfaces to adhere to the screen surface, thus reducing the likelihood of screen clogging. In other words, the separation apparatus according to this embodiment can not only efficiently separate solids such as insoluble solids from a liquid, but can also efficiently separate solids and oil from a liquid mainly composed of water.

[0055] Furthermore, by setting the speed at which the liquid passes through the screen to less than half the inflow velocity of the liquid flowing in from the inlet, solid particles are more easily swept away by the swirling flow.

[0056] The separation device according to this embodiment can be preferably used in the pretreatment of raw water for advanced membrane treatment, particularly in rainwater and factory wastewater. However, the invention is not limited to this, and can be applied to any technology that separates solids from liquids, such as the recovery of reusable resources in wastewater, the regeneration treatment of river and lake water, wastewater treatment for locally produced and consumed community plants, circulating water treatment for hydroponics, circulating water treatment for farmed fish, and ship ballast water treatment. Furthermore, the separation device according to this embodiment can not only separate liquids and solids, but also separate water and oil. Therefore, even if water containing oil is discharged from a ship accident or factory wastewater, the oil can be efficiently removed using only simple and inexpensive screen technology, without the need for chemical treatment using chemicals such as pH treatment agents, coagulants, various cleaning solutions, and disinfectants, or large-scale physical treatment using centrifugal separation. Thus, the separation device according to this embodiment can be said to be a separation device that enables rapid pollution control and significantly reduces the burden on the natural environment.

[0057] Although embodiments of the present invention have been described above with reference to the drawings, it should be understood that the specific configuration is not limited to these embodiments. The scope of the present invention is indicated not only by the description of the embodiments above but also by the claims, and further includes all modifications within the meaning and scope of equivalence to the claims. For example, in the separation device according to this embodiment, the screen may be surface-treated by a matte finish, or the entire interior of the separation tank may be made of a material surface-treated by a matte finish. By using a material surface-treated by a matte finish throughout the interior of the separation tank, it is possible to prevent oil from adhering to the surface of the materials constituting the separation tank, thereby improving the overall function of the separation tank and improving the efficiency of cleaning work during maintenance.

[0058] 1 Separation device 2 Separation tank 3 Inlet chamber 4 Outlet chamber 5 Partition plate 6 Screen 6a Screen corresponding to the position of the first swirling flow 6b Screen corresponding to the position of the second swirling flow 6c Hole 7 First chamber 8 Second chamber 9 Third chamber 10 Section 10a Swirling guide section 10b Watershed control section 11 Inlet section 12 Outlet section 13 Floating material discharge section 14 First opening 15 Opening 16 First sediment discharge section 17 Second opening 18 Second sediment discharge section 19 Screen without textured finish 19a Hole R1 First swirling flow area R2 Second swirling flow area R3 First retention area R4 Second retention area (first sedimentation area) R5 Third retention area R6 Fourth retention area (second sedimentation area) S Solid matter O Oil

Claims

1. A separation device for separating solid matter contained in an incoming liquid, comprising: a separation tank; a partition plate dividing the inside of the separation tank into an inlet chamber and an outlet chamber; a screen provided on the partition plate and having a plurality of holes; an inlet section formed in the inlet chamber; and an outlet section formed in the outlet chamber, wherein the inlet chamber is provided with a swirling guide section for reversing the liquid flowing in from the inlet section to form a vertical swirling flow inside the inlet chamber; the screen is positioned along the side surface of the formed swirling flow; and the screen is surface-treated by a matte finish.

2. The separation apparatus according to claim 1, wherein the inflow chamber is further provided with a flow control unit for generating a swirling flow region where the swirling flow formed when the liquid flows into the separation apparatus is located, and a retention region for retaining the solid matter.

3. The inflow chamber is partitioned from the upstream side into a first chamber, a second chamber and a third chamber; the first chamber and the second chamber are in communication through a first opening provided at the lower end of the swirling guide section; the second chamber and the third chamber are in communication through a second opening formed from the upper end of the swirling guide section and the upper end of the drainage control section; when the liquid flows into the separation device, a first swirling drainage area is formed in the second chamber, a second swirling drainage area is formed in the third chamber, a first retention area is formed in the upper part of the first chamber, a second retention area is formed in the lower part of the second chamber, a third retention area is formed in the upper part of the third chamber, and a fourth retention area is formed in the lower part of the fourth chamber; and the screen is provided in a position corresponding to at least the first swirling drainage area of ​​the second chamber and the second swirling drainage area of ​​the third chamber, as described in claim 2.

4. The separation apparatus according to claim 1, wherein the total opening area of ​​the holes in the screen is configured such that the speed at which the liquid passes through the screen is 1 / 10 or less of the inflow velocity of the liquid flowing in from the inflow section.

5. The separation device according to claim 1, wherein the total area of ​​the holes in the screen is designed to be within the range of 1 / 10 to 1 / 4 of the total area of ​​the screen.

6. The separation device according to claim 1, wherein the diameter of the holes in the screen is 1 mm or less.

7. The separation apparatus according to claim 1, wherein the screen is surface-treated by a matte finish achieved through blasting with an abrasive material.

8. The separation apparatus according to claim 1, wherein the screen is surface-treated by a textured finish achieved through plasma treatment or chemical etching.

9. The separation device according to claim 1, wherein the material of the screen is stainless steel or titanium, and the holes in the screen are formed by punching press processing.

10. A separation device for separating solid matter and oil contained in incoming water, comprising: a separation tank; a partition plate dividing the inside of the separation tank into an inlet chamber and an outlet chamber; a screen provided on the partition plate and having a plurality of holes; an inlet section formed in the inlet chamber; and an outlet section formed in the outlet chamber, wherein the inlet chamber is provided with a swirling guide section for reversing the water flowing in from the inlet section to form a vertical swirling flow inside the inlet chamber; the screen is arranged to follow the side surface of the formed swirling flow; and the screen is surface-treated by a matte finish.

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