Separation device

Abstract

A separation device capable of reliably separating insoluble solids and capable of being used stably for a long period of time is provided. [Solution] A separation device that separates solids contained in an inflowing liquid, comprising: a separation tank; a partition plate that divides the inside of the separation tank into an inflow chamber and an outflow chamber; a screen provided on the partition plate and having a plurality of holes; an inflow section formed in the inflow chamber; and a discharge section formed in the outflow chamber, wherein the inflow chamber is provided with a swirling induction section for inverting the liquid flowing in from the inflow section to form a vertical swirling flow in the inflow chamber, the screen is positioned so as to follow the side of the swirling flow formed, and the screen is surface-treated with a matte finish.

Description

[Technical field]

[0001] The present invention relates to an apparatus for separating solids contained in wastewater flowing through sewerage pipes, liquid flowing through wastewater treatment facilities in factories, and circulating water used in agriculture, fisheries, and the like. [Background technology]

[0002] In recent years, it has been predicted that water shortages will become serious on a global scale, and as a countermeasure, importance has been placed on the recycling of rainwater, industrial wastewater, etc. For example, rainwater and other wastewater that flows into sewerage systems is stored or discharged in rainwater storage and infiltration facilities, and the remainder is discharged into rivers.

[0003] However, insoluble solids such as soil, fallen leaves, and other garbage are mixed into drainage water such as rainwater, and if these insoluble solids flow into a rainwater storage and infiltration facility, frequent maintenance of the facility is required. In addition, when the rainwater is discharged from the rainwater storage and infiltration facility into a river, the solids are also discharged into the river at the same time, causing water pollution in the river and environmental pollution problems. For this reason, wastewater separation devices that separate solids are installed in some sewers.

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

[0005] For example, Patent Documents 1 and 2 disclose a separation device in which two screens with holes are arranged in parallel with respect to the flow of wastewater flowing into a separation layer, a swirling flow (swirl) that swirls along the screen surface by the flow energy of the wastewater is generated, and solids are separated by the swirling flow. This separation device allows solids larger than the screen holes to continue swirling without passing through the holes, and only water and solids smaller than the holes pass through the screen holes, thereby enabling efficient separation of solids. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4395190 [Patent Document 2] Patent No. 4668290 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the separation device described in the above document, clogging of the screen holes may occur depending on the properties of the insoluble solid matter.

[0008] Therefore, an object of the present invention is to provide a separation device that can reliably separate insoluble solids and can be used stably for a long period of time. [Means for solving the problem]

[0009] In order to achieve the above object, the separation device of the present invention comprises: A separation device for separating solids contained in an inflowing 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 portion formed in the inlet chamber; A discharge portion formed in the outflow chamber, The inflow chamber is provided with a swirl guide portion for inverting the liquid flowing in from the inflow portion to form a vertical swirling flow in the inflow chamber, The screen is disposed along a side surface of the swirling flow formed, The screen is characterized in that it is surface-treated with a matte finish. Effect of the Invention

[0010] According to one embodiment of the present invention, it is possible to provide a separation device that can reliably separate insoluble solids and can be used stably for a long period of time. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic top view of an example of a separation device according to this embodiment. [Diagram 2] FIG. 2 is a schematic front view of an example of the separation device according to this embodiment. [Figure 3A] FIG. 3A is a schematic photograph for explaining the state of holes in a screen before matte finishing. [Figure 3B] FIG. 3B is an enlarged photograph of FIG. 3A. [Figure 4A] FIG. 4A is a schematic photograph for explaining the state of holes in the screen after matte finish. [Figure 4B] FIG. 4B is an enlarged photograph of FIG. 4A. [Figure 5A] FIG. 5A is a schematic diagram for explaining the reason why the screen performance is improved by performing the matte finish, and is a schematic diagram showing the relationship between the screen before the matte finish and the solid matter and oil content. [Figure 5B] FIG. 5B is a schematic diagram for explaining the reason why the screen performance is improved by performing the matte finish, and is a schematic diagram showing the relationship between the screen after the matte finish and the solid matter and oil content. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A separation device according to an embodiment of the present invention will now be described with reference to the drawings.

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

[0014] As shown in Figures 1 and 2, the separation device 1 of this embodiment comprises a separation tank 2, a partition plate 5 that divides the interior of the separation tank 2 into an inflow chamber 3 and an outflow chamber 4, a screen 6 arranged on the partition plate 5, and a partition body 10 that divides the inflow chamber 3 from the upstream side into a first chamber 7, a second chamber 8, and a third chamber 9.

[0015] The separation tank 2 is a housing of the separation device 1 that is usually made of materials such as reinforced concrete, metal, fiber-reinforced plastic, etc. The upper part of the separation tank 2 is usually in an open state, and during the separation process, it is closed with a cover that can be opened and closed, such as an iron 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 at a position opposite to the inlet section 11 of the separation tank 2. Usually, the inlet section 11 and the outlet section 12 are provided on the upper side of the separation layer 2.

[0017] In addition, a floating matter discharge section 13 is provided above the third chamber 9 of the inflow chamber 3, and this floating matter discharge section 13 discharges floating solids and oil and prevents them from flowing out downstream from the outflow section 12.

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

[0019] The inflow chamber 3 is provided with a partition 10 that partitions the inflow chamber 3 from the upstream side into a first chamber 7, a second chamber 8, and a third chamber 9. The partition 10 is made of a material such as steel, FRP, a resin such as polyethylene, or concrete.

[0020] The first chamber 7 is configured to smoothly lower the liquid supplied from the inflow section 11 of the inflow chamber 3, and to smoothly generate a vertical swirling flow in the first swirling flow area R1 in the second chamber 8, which communicates with the first chamber 7 through the first opening 14 provided on the lower end side of the swirling guide section 10a of the partition 10 that divides the first chamber 7 and the second chamber 8. Therefore, the lower side of the swirling guide section 10a is configured to have a shape curved like an arc. Note that some of the floating solids, which are solids with a specific gravity less than 1 (or equal to or less than 1), float in the first retention area R3 generated in the upper part of the inflow section 11. These floating solids can be discharged from the floating solids discharge section 13 by increasing the amount of inflow water or decreasing the amount of outflow water to raise the water level in the inflow chamber 3 and move to the third retention area R5 described later. Therefore, the first chamber 7, the second chamber 8, and the third chamber 9 are configured to have a shape curved like an arc. style The structure is connected to the upper part of the entrance chamber 3. The floating solids and oils may be discharged automatically from the floating discharge part 13 by the above-mentioned method using a water level gauge, an automatic opening and closing valve, an automatic timer, etc. (not shown).

[0021] The second chamber 8 mainly serves to separate settleable solids having a specific gravity of more than 1 (or equal to or greater than 1), and an opening 15 is provided on the lower side of the second chamber 8, and most of the settleable solids having a specific gravity of more than 1 drop from the opening 15, retain in the first settling section (corresponding to the second retention area R4), and are discharged from the first sediment discharge section 16. This allows most of the settleable solids to be separated from the liquid.

[0022] The upper side of the second chamber 8 and the upper side of the third chamber 9 are connected to the second opening 17 formed by the upper end of the swirl guide portion 10a and the upper end of the flow control portion 10b, and the upper side of the swirl guide portion 10a and the flow control portion 10b are configured to have a curved shape in an arc shape so as to smoothly generate a vertical swirling flow in the second swirling flow area R2 in the third chamber 9. In the example shown in FIG. 2, the swirl guide portion 10a is provided on the lower side of the third chamber 9 near the wall on the outflow chamber 4 side so as to smoothly generate a vertical swirling flow. In FIG. 2, the swirl guide portion 10a plays a part of the role of the flow control portion 10b, and the flow control portion 10b also plays a part of the role of the swirl control portion 10a.

[0023] The third chamber 9 mainly serves to separate floating solids and oils having a specific gravity less than 1 (or equal to or less than 1), and a third retention area R5 is formed in the upper part of the third chamber 9. The floating solids and oils, etc., that are retained in the third retention area R5 and the first retention area R3 described above are discharged from the floating discharge section 13 by the method described above. Note that, for the sake of convenience, only one location each of the first retention area R3 and the third retention area R5 described above is shown in FIG. 2, but one or more first retention areas R3 may be formed on the first chamber 7, and one or more third retention areas R5 may be formed on the third chamber.

[0024] Furthermore, even solids with a specific gravity greater than 1 will have many floating solids that float and swirl in the swirling zone. When these floating solids are carried downward by the vertical swirling flow in the second swirling zone R2, they will remain in the second settling section (corresponding to the fourth retention zone R6) formed below the third chamber 9, and then sink under their own weight and be discharged from the second sediment discharge section 18 provided below the third chamber 9. Discharge of the settling solids and floating solids from the first sediment discharge section 16 and the second sediment discharge section 18 may also be automatically performed using an automatic opening and closing valve, an automatic timer, etc. (not shown).

[0025] The screens 6 are provided on two opposing edges of the width direction of the section 9, i.e., in a direction perpendicular to an axis connecting the inlet 11 side and the outlet 12 side, at positions corresponding to at least the first swirling flow area R1 of the second chamber 8 and the second swirling flow area R2 of the third chamber 9. Note that in FIG. 1 and other figures, the screens 6 are shown as screen 6a at a position corresponding to the first swirling flow area R1 and screen 6b at a position corresponding to the second swirling flow area R2. As a result, the screens 6 are arranged so as to follow the side surfaces of the swirling flows formed in the first swirling flow area R1 and the second swirling flow area R2.

[0026] In this embodiment, the screen 6 is a screen in which a plurality of holes of a predetermined size are formed on a metal plate made of a corrosion-resistant metal, more specifically, stainless steel, titanium, etc., and the surface is treated by matte finishing. The detailed structure and effects of the screen 6 will be described in Example 2 described later.

[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 so as to form a sufficient amount of a third retention zone R5 in the upper part of the third chamber 9, and in this embodiment, the screens are designed so that 40% of the discharge passes through the screen 6 in the second chamber 8 and 60% of the discharge passes 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 rate and stability of the swirling flow. The total opening area of ​​the holes in the screen 6 is preferably designed 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 speed of the liquid flowing in from the inlet 11. By setting the speed at which the liquid passes through the screen 6 to 1 / 2 or less of the inflow speed of the liquid flowing in from the inlet 11, solids are easily swept away by the swirling flow. In this embodiment, the total opening area of ​​the holes in the screen 6 is 15 times the cross-sectional area of ​​the inlet 11.

[0029] In addition, the aperture ratio of the holes of the screen 6, that is, the ratio of the total area of ​​the holes of the screen 6 to the total area of ​​the screen 6, is preferably within the range of 10% to 25% (1 / 10 to 1 / 4). The general aperture ratio in conventional water treatment is about 30% (3 / 10) to 60% (3 / 5) or more. However, in this embodiment, the screen 6 is arranged along the side of the swirling flow formed in the first swirling flow area R1 and the second swirling flow area R2, so the aperture ratio can be reduced. By reducing the aperture ratio, the area of ​​the non-opening part becomes wider, so that the hydrophilicity of the screen 6 becomes stronger, and it becomes difficult for oil to adhere to the screen 6 due to van der Waals force, and the oil particles are easily bonded to each other due to hydrophobic interaction, so that the floating separation effect is enhanced and the oil separation by the screen becomes easy. In this embodiment, the aperture ratio of the holes of the screen 6, that is, the ratio of the total area of ​​the holes of the screen 6 to the total area of ​​the screen 6, is 10% (1 / 10).

[0030] The separation device 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 hole diameter of the screen 6 is set to 1 mm or less. In this embodiment, most solids are swirled along the side of the screen 6 without passing through the holes, and the size of solids that can pass through is only about 1 / 3 to 1 / 4 or less of the hole diameter. That is, in this embodiment, it is possible to capture solids of about 300 to 250 μm (even smaller solids by adjusting the hole diameter of the screen 6).

[0031] A method for separating solids contained in a liquid using the above-described separation device 1 will be described. In Fig. 1 and Fig. 2, arrows are generally attached to show an example of the movement direction of the liquid in order to explain the path of the liquid in 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 swirl guide portion 10a and moves into the second chamber 8 through the first opening 14. The liquid moved into the second chamber 8 is guided upward by the flow area control portion 10b. As a result, a swirling flow is generated in the liquid in the second chamber 8 in the vertical direction.

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

[0033] On the other hand, part of the liquid swirling vertically in the second chamber 8 flows out through the screen 6 into the outflow chamber 4, but at that time, solid matter contained in the liquid is captured on the surface of the screen 6 and separated without passing through.

[0034] A part of the liquid swirling in the vertical direction in the first chamber 7 moves to the third chamber 9 through the second opening 17 provided above the first chamber 7. The liquid moved into the third chamber 9 is guided downward due to the shapes of the swirl guide portion 10a and the flow basin control portion 10b that form the second opening 17 and the weight of the liquid. As a result, a vertical swirling flow is generated in the liquid in the third chamber 9.

[0035] A part of the floatable solids is retained in a first retention area R3 generated in the upper part of the first chamber 7, and the floatable solids that flow into the third chamber 9 are retained in a third retention area R5 generated in the upper part of the third chamber 9. By increasing the amount of inflow water or decreasing the amount of outflow water, the water level in the inflow chamber 3 is raised and the entire amount is moved to the third retention area R5 and discharged from the floatable matter discharge section 13.

[0036] Furthermore, even solids with a specific gravity greater than 1 exist in large quantities in the swirling zone. When these floating solids are carried downward by the vertical swirling flow in the second swirling zone R2, they are retained in the second settling section (corresponding to the fourth retention zone R6) formed below the third chamber 9, and then sink under their own weight and are discharged from the second sediment discharge section 18 provided below the third chamber 9.

[0037] On the other hand, part of the liquid swirling vertically in the third chamber 9 flows out through the screen 6 into the outflow chamber 4, but at that time, solid matter contained in the liquid is captured on the surface of the screen 6 and separated without passing through.

[0038] (Example 2 - Effect of matte finish) Next, an example will be described in which it has been confirmed that by using as the screen 6 a screen having a plurality of holes and having a matte surface treatment, insoluble solids can be reliably separated and the screen can be used stably for 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 lattice pattern, but a screen provided with a plurality of holes, such as a punching screen.

[0040] When a wedge wire screen is used, there is an area where the vertical swirling flow along the side of the screen flows in the direction of the linear mesh width between the V-shaped wires, and solid matter may get into that area and cause clogging of the screen. For this reason, in this embodiment, a screen with multiple holes such as a punched screen is used instead of a wedge wire screen. As a screen with multiple holes, a commercially available punched screen may be used, but a screen with a specified plate thickness made by diffusion bonding thin plates designed to have a specified hole diameter and opening rate by etching or the like may also be used.

[0041] As described above, the screen 6 of the separation device according to this embodiment is provided on two opposing edge portions in the width direction of the section 9, i.e., 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 area R1 of the second chamber 8 and the second swirling flow area R2 of the third chamber 9. For this reason, the outer circumferential 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 is preferably circular or elliptical from the viewpoint of handling in installation and removal when replacing the screen, etc.

[0042] In this embodiment, a screen having a plurality of holes and having a surface treated by matte finish is used. Note that, in this embodiment, matte finish refers to a process for processing the surface of a screen made of a corrosion-resistant metal such as titanium or stainless steel into a surface having fine irregularities.

[0043] The method for texture-finishing the screen is not particularly limited as long as it is capable of forming fine irregularities on the surface of the screen. For example, physical texture-finishing methods such as sandblasting (sand matt treatment) and embossing using an embossing roll having a textured surface may be used, or chemical texture-finishing methods such as plasma treatment and chemical etching may be used.

[0044] Fig. 3 shows a schematic photograph for explaining the state of the holes in the screen before the matte finish, and Fig. 4 shows a schematic photograph for explaining the state of the holes in the screen after the matte finish. Fig. 3B is an enlargement of Fig. 3A, and Fig. 4B is an enlargement of Fig. 4A. The sample used was a stainless steel material (SUS304-2B material) with a plate thickness of 0.5 mm, with holes with a diameter of 1.0 mm formed using a punching press, and sandblasting was used for the matte finish.

[0045] As shown in Fig. 3A, the screen 19 as a stainless steel material before matte finishing has scratches on its surface, and the surface is rough and uneven due to the occurrence of steel making, etc. Therefore, when a screen before matte finishing is used, fibrous solids or solids with soft surfaces in rainwater or industrial wastewater may adhere to it.

[0046] 3B, when holes 19a are formed in screen 19 as a stainless steel material before matte finishing, a punch from a punching press is pressed into the screen, so burrs are generated around the entire circumference of the holes and the fracture surface becomes rough. Therefore, when a screen before matte finishing is used, insoluble solids may get caught on the rough fracture surface and burrs, causing clogging.

[0047] On the other hand, as shown in Figures 4A and 4B, the screen 6 as a stainless steel material after matte finish has its surface roughness improved by fine sandblasting (abrasive material) to form uniform dimples (unevenness), and the burrs around the holes 6c and the roughness of the fracture surface are also significantly improved.

[0048] The reason why the screen performance is improved by applying the matte finish to the screen will be explained with reference to the drawings. Fig. 5 shows a schematic diagram for explaining the reason why the screen performance is improved by applying the matte finish, and in particular Fig. 5A shows a schematic diagram showing the relationship between the screen before the matte finish, and the solid matter and oil content, and Fig. 5B shows a schematic diagram showing the relationship between the screen after the matte finish, and the solid matter and oil content.

[0049] As described above, the separation device in this embodiment forms a vertical swirling flow in the inflow chamber, and the screen is disposed along the side of the swirling flow that is formed. That is, as shown by the arrow in Figure 5, the direction of the swirling water is parallel to the surface of the screens 6 and 19.

[0050] As shown in Fig. 5A, when a screen 19 that is not matte-finished is used, solid matter S in the liquid comes into surface contact with the screen 19, increasing the contact area and making it easier for the solid matter S to adhere to the screen 19. Furthermore, the solid matter S that adheres to the screen 19 is difficult to peel off due to the shear force of the running water flowing along the screen surface, which can cause clogging of the screen 19. Furthermore, oil O in the liquid also tends to adhere to the rough surface of the screen 19, which can cause insoluble solid matter to adhere.

[0051] On the other hand, as shown in FIG. 5B, when a matte-finished screen 6 is used, the solid matter S in the liquid comes into contact with the apexes of the convex parts of the screen 6 at multiple points, so the contact area is small and the solid matter S is less likely to adhere to the screen 6. In addition, the solid matter S that adheres to the screen 6 is easily peeled off by the shear force of the running water flowing along the screen surface, so the solid matter S does not adhere to the screen 6. In addition, since water accumulates in the concave parts of the screen surface and becomes hydrophilic, the oil O in the liquid is surrounded by water, and the van der Waals force is strengthened, so the oil O does not adhere to the surface. Furthermore, since the hydrophobic interaction promotes the bonding between the oils O, the size of the oil O increases and the floating force increases, so that the oil O can be captured by using the floating separation of the oil O. Furthermore, since the rough surface of the screen 6 is also smoothly unevenly processed by the matte-finishing, fibrous solid matter such as hair and solid matter with a soft surface are less likely to adhere to the surface of the screen 6, and clogging of the screen 6 is less likely to occur.

[0052] In addition to the matte finish, several methods are known for improving the rough surface of the screen and the burrs around the holes. For example, a method of applying (coating) a fluororesin or ceramics, or a method of mirror-finishing the surface by electrolytic polishing, etc. are known. However, in the case of a coating process using a fluororesin, the coating thickness becomes relatively large, and the holes of the screen are largely blocked by the coating material, so that it may be difficult to ensure a predetermined hole diameter and opening area. In addition, the coating film itself may peel off. In addition, in the case of a coating process using ceramics, the coating film thickness can be reduced, but the adhesion to the screen body is low, and it may be difficult to ensure the screen performance over a long period of time due to peeling of the coating film, etc. In addition, when the surface of the screen is mirror-finished by electrolytic polishing, the rough surface of the surface and the burrs around the holes can be removed, but the frictional resistance increases, so that solid matter is more likely to adhere to the surface, and it is difficult to peel off by the shear force of running water flowing along the screen surface.

[0053] As described above, the separation device of this embodiment is a separation device that separates solids contained in an inflowing liquid, and includes a separation tank, a partition plate that divides 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 section formed in the inflow chamber, and a discharge section formed in the outflow chamber, the inflow chamber is provided with a swirling induction section for inverting the liquid flowing in from the inflow section to form a vertical swirling flow in the inflow chamber, the screen is arranged to follow the side of the swirling flow formed, and the screen is surface-treated by matte finish.

[0054] Therefore, solid matter in the liquid comes into contact with the apexes of the convex parts of the screen surface at multiple points, so the contact area is small and it is difficult for the solid matter to adhere to the screen. In addition, solid matter that adheres to the screen is easily peeled off by the shear force of the running water flowing along the screen surface, so the solid matter does not adhere to the screen. In addition, since water accumulates in the concave parts of the screen surface and becomes hydrophilic, the oil in the liquid is surrounded by water and the van der Waals force is strengthened, so the oil does not adhere to the surface. Furthermore, since the hydrophobic interaction promotes the bonding between the oils, the size of the oil increases and the floating force increases, so that the oil can be captured by using the floating separation of the oil. Furthermore, since the rough surface of the screen is also smoothly unevenly processed by the matte finish, fibrous solid matter such as hair and solid matter with a soft surface are difficult to adhere to the screen surface, and clogging of the screen is unlikely to occur. In other words, the separation device according to this embodiment can not only efficiently separate solids such as insoluble solids from liquids, but also efficiently separate solids and oils from liquids whose main component is water.

[0055] In addition, by setting the speed at which the liquid passes through the screen to half or less the inflow speed of the liquid entering from the inflow section, the solids are easily swept away by the swirling flow.

[0056] The separation device according to this embodiment can be preferably used in pretreatment of raw water for advanced membrane treatment, particularly for rainwater or industrial wastewater, but the invention is not limited in this respect. It can be applied to any technology for separating solids from liquids, such as recovery of reusable resources in wastewater, reclamation of river water or lake water, wastewater treatment of local production and consumption type community plants, circulating water treatment for hydroponic agriculture, circulating water treatment for farmed fish, and ship ballast water treatment. In addition, the separation device according to this embodiment can not only separate liquids and solids, but also water and oil. Therefore, even if oil-containing water is discharged from a ship accident or industrial wastewater, the oil can be efficiently removed only by simple and inexpensive screen technology without using chemical treatment using chemicals such as pH treatment agents, coagulants, various cleaning solutions, and disinfectants, or large-scale physical treatment using centrifugation. Therefore, it can be said that the separation device according to this embodiment is a separation device that can take rapid pollution countermeasures and significantly reduce the burden on the natural environment.

[0057] Although the embodiments of the present invention have been described above based on the drawings, the specific configuration should not be considered to be limited to these embodiments. The scope of the present invention is not only the description of the above-mentioned embodiments but also the claims, and further includes all modifications within the meaning and scope of the claims. For example, in the separation device according to this embodiment, it is sufficient that the screen is surface-treated by matte processing, and the entire inside of the separation tank may be made of a material surface-treated by matte processing. By using a material surface-treated by matte processing for the entire inside of the separation tank, it is possible to prevent oil from adhering to the surface of the material constituting the separation tank, thereby improving the function of the entire separation tank and improving the efficiency of cleaning work during maintenance. [Explanation of symbols]

[0058] 1 Separation device 2 Separation tank 3 Inflow chamber 4 Outflow chamber 5 Partition 6 Screens 6a Screen corresponding to the position of the first swirl flow 6b Screen corresponding to the position of the second swirl flow 6c hole 7 Room 1 8 Room 2 9 Room 3 10 segmented field 10a Turning guidance section 10b Watershed Control Division 11 Inlet 12 Discharge section 13 Floating matter discharge section 14 First opening 15 Opening 16 First sediment discharge section 17 Second Opening 18 Second sediment discharge section 19 Non-textured screen 19a Hole R1 First swirl area R2 2nd swirl basin R3 1st retention area R4 Second retention area (first settling area) R5 3rd retention area R6 4th retention area (2nd settling area) S solids O Oil content

Claims

1. A separation device for separating solids contained in an inflowing 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 portion formed in the inlet chamber; A discharge portion formed in the outflow chamber, The inflow chamber is provided with a swirl guide portion for inverting the liquid flowing in from the inflow portion to form a vertical swirling flow in the inflow chamber, The screen is disposed along a side surface of the swirling flow formed, The screen is surface-treated by matte finish. Separation device.

2. The inflow chamber is further provided with a flow area control section for generating a swirling flow area in which the swirling flow formed when the liquid flows into the separation device and a retention area in which the solid matter is retained. The separation device of claim 1 .

3. The inflow chamber is partitioned into a first chamber, a second chamber, and a third chamber from the upstream side, The first chamber and the second chamber communicate with each other through a first opening provided at a lower end of the swirl guide portion, The second chamber and the third chamber are communicated with each other through a second opening formed from an upper end of the swirl guide portion and an upper end of the flow basin control portion, When the liquid flows into the separation device, a first swirling flow area is formed in the second chamber, a second swirling flow area is formed in the third chamber, a first retention area is formed in an upper portion of the first chamber, a second retention area is formed in a lower portion of the second chamber, a third retention area is formed in an upper portion of the third chamber, and a fourth retention area is formed in a lower portion of the third chamber; The screen is provided at a position corresponding to at least the first swirling flow area of ​​the second chamber and the second swirling flow area of ​​the third chamber. The separation device of claim 2 .

4. The total opening area of ​​the holes of the screen is configured so that the speed at which the liquid passes through the screen is 1 / 10 or less of the inflow speed of the liquid flowing in from the inflow section. The separation device of claim 1 .

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

6. The hole diameter of the hole of the screen is 1 mm or less. The separation device of claim 1 .

7. The screen is surface-treated by blasting with an abrasive material to give it a matte finish. The separation device of claim 1 .

8. The screen is surface-treated by a matte finish such as a plasma treatment or a chemical etching treatment. The separation device of claim 1 .

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

10. A separation device for separating solids and oil contained in inflowing water, 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 portion formed in the inlet chamber; A discharge portion formed in the outflow chamber, The inflow chamber is provided with a swirl guide portion for inverting the water flowing in from the inflow portion to form a vertical swirl flow in the inflow chamber, The screen is disposed along a side surface of the swirling flow formed, The screen is surface-treated by matte finish. Separation device.

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