JP2013107075A - Screen device for wastewater treatment tank, and wastewater treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent plugging caused by a fluid carrier in a filtration part for preventing the outflow of the fluid carrier from a treatment tank in wastewater treatment using the fluid carrier to which microorganisms are fixed.SOLUTION: A screen device installed at a wastewater treatment tank includes a fluid carrier eliminating part and a drive mechanism that are attached to a body. The body includes a water inlet part for taking treatment water into the treatment tank, and a drain part for draining the treatment water to the outside of the treatment tank. The water inlet part has a rotatable screen part of bottomed cylinder shape provided with the filtration part on the peripheral surface. The fluid carrier eliminating part is disposed to be in proximity to or to abut on the rotating peripheral surface of the screen part, and the drive mechanism rotationally drives the screen part.

Description

  The present invention relates to a screen device incorporated in a wastewater treatment device (wastewater treatment tank) using a fluid carrier for immobilizing microorganisms. Moreover, this invention is a wastewater treatment method using the said screen apparatus.

  A wastewater treatment device that uses a granular fluid carrier with immobilized microorganisms is a device in which the fluid carrier is suspended in a treatment tank together with waste water (treatment target water), and the waste water is treated with microorganisms immobilized on the fluid carrier. is there. When the floating fluid carrier flows out of the treatment tank, the microbial treatment capacity is lowered. Therefore, a screen that prevents the fluid carrier from flowing out (filtered) is provided at the treated water discharge location from the treatment tank where the granular fluid carrier floats. Part).

  And the structure where the clogging by a fluid support | carrier does not arise in a screen (filtration part) is employ | adopted for the processing tank. For example, Patent Documents 1 and 2 disclose means for generating a flow (side flow) following a fixed screen in a processing tank. Patent Document 3 discloses means for providing a high-pressure water injection mechanism in a half-rotated horizontal axis rotating drum screen.

  Patent Document 4 discloses a wastewater treatment apparatus that suspends microorganism-adhering carrier particles in a tank and circulates the microorganism-adhering carrier particles by gas stirring to treat the wastewater aerobically. In Patent Document 4, it is described that sand, anthracite, activated carbon, zeolite, plastic sphere, artificial bone, or the like is used as a microbial adhesion carrier. Further, it is described that the screen of the waste water treatment apparatus is constituted by a wedge wire. It is also described that the opening of the wedge wire is set smaller than the particle size of the carrier, and a cleaning brush for preventing clogging is fixed outside.

  Patent Document 5 discloses a reaction tank filled with a microbial carrier, a cylindrical carrier separation means having drainage means for discharging treated water to the outside of the reaction tank, and a carrier that swirls the outer peripheral surface of the carrier separation means. A carrier-added biological treatment apparatus comprising a removing means and a stirring means for stirring the liquid in the reaction tank and the microorganism carrier is disclosed. Here, it is described that the carrier separation means is specifically a bottomed carrier separation cylinder having a cylindrical surface constituted by a wedge wire or a punching metal screen having a gap smaller than the particle diameter of the carrier. Yes. Further, it is described that the carrier removing means is specifically an inverted U-shaped carrier separating blade that swirls around the outer peripheral surface of the carrier separating cylinder.

JP 2002-86176 A JP-A-2005-254116 Japanese Patent Laid-Open No. 8-215693 Japanese Utility Model Publication No. 61-22599 JP 11-267678 A

  In Patent Documents 1 and 2, the clogging eliminating means for generating a side flow with respect to the fixed screen (fixed filtration part) is the side even if the flow carrier is caused to flow into the discharge flow and get caught in the water passage location of the screen. The fluid carrier is caused to flow by a flow. However, if the fluid carrier is caught, the water flow area is reduced, thereby increasing the outflow amount of other water flow portions, and the fluid carrier is more easily clogged. Therefore, in the case of a fixed screen, even if a screen side flow is generated, it cannot be said that clogging is completely prevented as long as there is a discharge flow at the water passage location.

  As described in Patent Document 3, when high-pressure injection is performed in a rotating drum screen, a drive pump for spray water is also required when the screen is driven. Moreover, since the high-pressure jet water returns to the treatment tank together with the fluid carrier clogged in the screen, the treatment target water (waste water) is increased.

  The carrier used in Patent Document 4 is a hard carrier having no elasticity such as sand, anthracite, activated carbon, zeolite, plastic sphere, and artificial aggregate, and is difficult to be deformed by an external force. Therefore, the problem that the carrier is clogged with the openings of the screen set smaller than the particle size of the carrier hardly occurs. Further, although the screen surface is constantly brushed, there is a problem that when the carrier is fitted in the opening, the brush is bent and the fitted carrier cannot be scraped.

  The carrier separation blade in the carrier-added biological treatment apparatus described in Patent Document 5 rotates so as to stroke the carrier separation cylinder, or is kept at an interval smaller than the particle diameter of the microbial carrier between the carrier separation cylinder and the outer peripheral surface of the carrier separation cylinder. It will rotate. Therefore, when the carrier fits in the back of the screen, the carrier cannot be scraped out and clogging cannot be sufficiently eliminated.

  Therefore, the present invention proposes a screen device for a wastewater treatment tank that can immediately and reliably eliminate clogging when clogging occurs.

  The above-mentioned problem is a screen device installed in a wastewater treatment tank; the screen device is provided with a fluid carrier exclusion portion and a drive mechanism attached to a main body, and the main body takes in treated water in the treatment tank. And a drainage part for discharging treated water to the outside of the treatment tank, the water-filling part having a rotatable bottomed cylindrical screen part provided with a filtration part on a peripheral surface, and the fluid carrier The exclusion unit is disposed so as to be close to or in contact with the rotation peripheral surface of the screen unit, and the driving mechanism is solved by providing a screen device that rotationally drives the screen unit.

  In the treatment tank, the wastewater treatment (BOD removal, nitrogen removal) is performed by the action of the microorganisms immobilized on the fluid carrier, and the treatment target water in the treatment tank is discharged to the next treatment tank or the like. At the time of this discharge, the discharge flow passes through the filtration part of the screen part to prevent the flow carrier (porous material) from flowing out. Even if the fluid carrier fits into the water passage location of the filtration portion and clogs occur, the screen portion is rotating, and the fluid exclusion portion is in proximity to or against the cylindrical peripheral surface that is the water passage location. Since they are in contact with each other, the fluid carrier causing fluid clogging collides with the fluid exclusion portion, and the fluid carrier is pushed away from the water location, so that the clogging is eliminated immediately. In addition, when the fluid exclusion portion is made of metal, it is preferable to arrange it in close proximity in consideration of friction and wear, but when it is made of resin, it may be arranged in contact.

  It is preferable that the filtration part is formed by water passage holes provided in multi-stage concave grooves along the rotation direction, and the fluid carrier exclusion part has a comb-teeth shape that meshes with the concave groove. As a result, even if the fluid carrier is deformed and fitted into the groove, the fluid carrier can be separated so as to be scraped off from the filtration part at the comb teeth portion. Therefore, clogging due to the fluid carrier is reliably eliminated. Moreover, even if the suspended sludge in the tank accumulates in the groove, the sludge is separated so as to be scraped off from the filtration portion at the comb teeth portion, so that clogging due to the sludge is reliably eliminated.

  The main body is a vertical tube type, a drive source portion of the drive mechanism is provided at the upper portion of the main body, the water inlet portion is provided at the lower end, the drainage portion is provided laterally on the side surface, and the It is also preferable that a drive shaft is provided in the main body, and the screen portion and the drive source portion provided at the lower end of the drive shaft are connected by the drive shaft. Thereby, drive source parts, such as a drive motor and a speed-reduction mechanism, can be arrange | positioned not in water but the process tank water surface. Therefore, it is not necessary to incorporate the drive source unit as a sealing structure.

  It is also preferable that the drainage portion is constituted by a drainage cylinder portion protruding from the main body and a mounting drainage portion mounted on the treatment tank, and a connection / detachment structure is provided between the drainage portion and the mounting drainage portion. As a result, the main body side can be separated at the location of the drainage cylinder part with respect to the attached drainage part fixed to the side surface of the treatment tank, so that the screen device can be separated and taken out while the treatment tank is left as it is. Convenient for (inspection / repair).

  The above-mentioned problem is also a wastewater treatment method using the above-mentioned screen device, and also provides a wastewater treatment method characterized in that wastewater is treated with microorganisms immobilized on a fluid carrier in the wastewater treatment tank. Solved.

  The screen device of the present invention includes a screen portion that performs a rotation operation and a fluid exclusion portion that is disposed close to or in contact with the filtering portion (rotating peripheral surface) of the screen portion, so that clogging is ensured. Can be resolved.

It is a figure which shows the screen apparatus for wastewater treatment tanks concerning embodiment of this invention. It is the figure which expanded the screen part of FIG. It is sectional drawing of the screen part of FIG. It is a disassembled perspective view of the screen part of FIG. It is the figure which expanded the location enclosed with the continuous line in FIG. It is sectional drawing which cut | disconnected the filtration part by the surface parallel to XY plane of FIG. It is a figure which shows the use condition of the screen apparatus for wastewater treatment tanks. It is a figure which shows the screen apparatus for wastewater treatment tanks concerning other embodiment of this invention. It is the figure which expanded the screen part of the screen apparatus of FIG.

  Next, an embodiment of the present invention will be described. The illustrated embodiment includes a main body 1, a screen portion 2 provided on the main body 1, a drive mechanism 3, a fluid exclusion portion 4, and a mounting drainage portion 5.

  The main body 1 is a vertical cylinder type and has a height at which the upper surface portion is sufficiently higher than the water level of the processing bath A and the lower portion is positioned below the planned water level of the processing bath A when installed in the processing bath A described later. Is. FIG. 1 is a diagram showing a screen device according to an embodiment of the present invention. As shown in FIG. 1, the main body 1 has a lower end surface opened in a circular shape, and an annular water inlet 11 formed of a resin material is provided at the opening location. A drain tube portion 12 communicating with the inside of the main body 1 is provided at an appropriate height (below the planned water level) of the main body 1. A connection mounting portion 13 is provided at the opening end of the drain tube portion 12. The connection mounting part 13 is a rectangular flange. Further, a suspension ring 14 is mounted on the upper surface of the main body 1.

  FIG. 2 is an enlarged view of the screen unit 2. FIG. 3 is a cross-sectional view of the screen unit 2. As shown in FIGS. 2 and 3, the screen unit 2 includes a filtering unit 21, a resin cylinder 22, and an upper through hole plate 23. FIG. 4 is an exploded perspective view of the screen portion. As shown in FIG. 4, the filtration part 21 is formed by a bottom plate 211, a large number of laminated ring plates 212, a large number of gap forming bodies 213, a lower through hole plate 214, and a laminated connecting bolt part 215.

  The filtration unit 21 is formed by laminating a laminated ring plate 212 provided with a bolt hole 212a on the inner peripheral side and a gap forming body 213 provided with a bolt hole alternately and in multiple stages on a circular bottom plate 211. is there. Further, the filtering part 21 is formed by covering the lower through-hole plate 214 and integrating the whole with a laminated connecting bolt part 215. The lower through-hole plate 214 has a shaft coupling portion 214a at the center, and has a radial arm plate 214b and an annular plate portion 214c. FIG. 3 shows an example in which the filtering part 21 is formed by tightening the end of the laminated connecting bolt part 215 with a nut. The connecting member used when integrating the members constituting the filtering part 21 is not limited to the laminated connecting bolt part 215. For example, the said filtration part 21 may be formed by welding the edge part of a stick | rod using a round bar and a square bar as a connection member.

  By the said structure, while having a bottomed cylindrical shape and having the multistage groove groove | channel a on an outer peripheral surface, the filtration part 21 used as the water flow hole b is formed except the connection location inside the said groove groove | channel a. is there. The width of the groove a is narrower than the particle size of the carrier used in the wastewater treatment from the viewpoint that the fluid carrier does not flow out of the treatment tank. Here, the width of the groove a can be adjusted by the thickness of the gap forming body 213. That is, the width of the groove groove a can be adjusted only by changing the thickness of the gap forming body 213. Therefore, in the screen device of the present invention, there is an advantage that the width of the groove groove a can be easily adjusted as compared with the case where the filtering part 21 is formed of a wedge wire or a punching metal.

  In the screen portion 2, a resin cylinder 22 corresponding to the water inlet portion 11 is interposed between the upper through hole plate 23 and the filtration portion 21. The upper through-hole plate 23 includes a shaft connecting portion 231 at the center and a radial arm plate 232 and an annular plate portion 233.

  The drive mechanism 3 includes a drive source unit 31 including a drive motor and a speed reduction mechanism, and a drive shaft 32. The drive source unit 31 is provided on the upper surface portion of the main body 1, and the drive shaft 32 penetrates through the main body to connect the shafts of the upper through hole plate 23 and the lower through hole plate 214 of the lower screen unit 2. It is connected and fixed to the screen part 2 through the parts 231 and 214a.

  Then, by connecting and fixing the drive shaft 32 and the screen portion 2, the resin cylinder 22 is fitted and attached to the water inlet portion 11 in a substantially water sealed state.

The fluid carrier exclusion portion 4 is suspended from the lower side surface of the main body 1, and has one side as a comb tooth portion 41 that protrudes into and engages with the concave groove a of the filtration portion 21. Here, the dimension of the groove groove a and the comb tooth part 41 is demonstrated using drawing. FIG. 5 is an enlarged view of a portion surrounded by a solid line in FIG. As shown in FIG. 5, the portion where the comb teeth portion 41 protrudes and meshes with the concave groove a of the filtration portion 21 has a structure in which the laminated annular plates 212 and the comb teeth portions 41 are alternately arranged. Here, the distance to the laminate attachment bolt portion 215 and d ₁ from the rotational circumferential surface of the laminated ring plate 212. The distance from the top of the comb tooth portion 41 to the rotational peripheral surface of the laminated ring plate 212 and d _2. At this time, may be in contact with the top of the laminate attachment bolt portion 215 and the comb portion 41, but friction, wear in consideration of the distance d ₂ is preferably shorter than the distance d _1. On the other hand, the sludge deposited carrier and fitted into concave groove a, particularly the sludge adhering to such surface from the viewpoint of efficiently scrape the laminate attachment bolt portion 215, a distance d ₂ than 1/4 of the distance d ₁ is long it is preferable, it is more preferred longer than 1/2 of the distance d _1. Further, as shown in FIG. 5, the distance d ₃ of the rotating peripheral surface of the laminated ring plate 212 and the fluid exclusion section 4 is suitably shorter than the particle size of the fluidized carrier.

As shown in FIG. 5, the width of the concave groove a and w _1, the width of the comb teeth 41 and w _2. At this time, the surface of the laminated ring plate 212 and the side surface of the comb tooth portion 41 may be in contact with each other, but the width w ₂ is preferably narrower than the width w _{1 in} consideration of friction and wear. On the other hand, the sludge adhering to the surface of the laminated ring plate 212 from the viewpoint of efficiently scrape, width w ₂ is preferably wider than 2/3 of the width w _1. The shape of the laminated ring plate 212 is not particularly limited, and may be a flat plate shape or a shape that gradually becomes thinner or thicker as the thickness reaches the inner peripheral side. The width w ₁ when the thickness of the laminated annular plate 212 is different means the width of the widest portion of the groove a. From the viewpoint of efficiently scraping off the sludge adhering to the entire surface of the laminated ring plate 212, as shown in FIG. 5, it is preferable that the laminated ring plate 212 is flat and adjacent laminated ring plates 212 are parallel. .

  The shape of the comb-tooth part 41 is not specifically limited. In the illustrated example, the shape of the comb tooth portion 41 is a quadrangle, but is not limited thereto, and may be a triangle or a trapezoid. The shape of the top surface of the comb-tooth portion 41 is not limited, and the top portion may be flat or rounded. Further, the material of the comb tooth portion 41 is not limited, and any material that can reliably eliminate clogging of the groove groove a and the water passage hole b can be used, and metal, resin, or the like can be employed. Especially, it is suitable that the comb-tooth part 41 is a metal from a viewpoint that the deformation | transformation and damage accompanying rotation of the screen part 2 do not arise easily.

Next, the installation position of the fluid carrier exclusion unit 4 with respect to the screen unit 2 will be described. 6 is a cross-sectional view of the filtration unit 21 cut along a plane parallel to the XY plane of FIG. Moreover, the arrow of FIG. 6 shows the rotation direction of the screen part 2. Here, as shown in FIG. 6, a point where the comb tooth portion 41 overlaps the rotation circumferential surface of the laminated annular plate 212 is defined as a contact P. The tangent extended from the contact point P in the direction of rotation opposite the tangent L _1, and the tangential line L ₁ and the comb portion 41 is an angle between the angle alpha. From the viewpoint of easily dissociating the scraped carrier and sludge from the screen portion 2, the angle α is preferably an obtuse angle. Specifically, the angle α is preferably larger than 90 °. On the other hand, the angle α is usually smaller than 180 °.

  The inventors tried to scrape out the carrier and sludge fitted in the groove a by rotating the screen portion 2 in the direction opposite to the rotation direction shown in FIG. In this case, the angle α was smaller than an acute angle, that is, 90 °. As a result, there arises a problem that the scraped carrier or sludge stays between the fluid carrier exclusion unit 4 and the screen unit 2.

  The mounting drainage part 5 includes a drainage pipe part 51, a wall surface mounting plate part 52 that is formed to project from the middle of the drainage pipe part 51, and a connection part 53 provided at the pipe end. The connecting portion 53 includes left and right inner groove portions 531 into which the connecting mounting portion (rectangular flange) 13 can be inserted from above, and a lower support protrusion 532 on which the connecting mounting portion 13 can be placed.

  And the drain pipe part 51 (the side opposite to the formation side of the connection part 53) of the said mounting drain part 5 is inserted in the drain hole provided in the wall surface of the processing tank A. The wall surface mounting plate 52 is applied to the wall surface of the processing tank A, and the mounting drainage unit 5 is fixed with an anchor bolt or the like. In this state, the connecting portion 53 protrudes into the processing tank A.

  When incorporating the main body 1 into the processing tank A, the main body 1 is lifted using the suspension ring 14, and the connection mounting portion 13 is inserted into the inner groove portion 531 from above the connection portion 53. And the connection mounting part 13 is mounted in the downward support protrusion 532, and the main body 1 is stood up in the process tank A by uniting the connection mounting part 13 and the connection part 53 in the said state. At this time, the connection mounting part 13 and the connection part 53 may be fixed with the volt | bolt as needed.

  The processing tank A is filled with water to be treated (waste water) B and a required amount of fluid carrier C. The treatment target water B that has undergone predetermined treatment (anaerobic treatment or aerobic treatment such as BOD removal / nitrogen removal) passes through the screen unit 2 and the main body 1 from the filtration unit 21 to the drainage unit (drainage tube unit 12). And the drain pipe 51) to the next processing tank D or the like. At this time, the filtration unit 21 prevents the fluid carrier C from being discharged together with the discharged flow.

  The drive source unit 31 of the drive mechanism 3 is operated at regular intervals or at appropriate intervals, and this rotation operation rotates the screen unit 2 with the drive shaft 32.

  Therefore, when the fluid carrier C that flows along with the discharge flow and collides with the filtration unit 21 is a porous material that is deformable, such as a sponge-like member or a gel-like member, the fluid carrier C is partially deformed. There is also a possibility of fitting into the groove a. Specifically, since it is easily deformed when it flows along with the discharge flow and collides with the filtration part 21, it is easy to fit into the groove a. However, even if such a fluid carrier C fits into the groove a and becomes clogged, the comb tooth portion 41 scrapes the fluid carrier C by the rotation operation of the screen portion 2. As a result, the clogging is immediately resolved. Moreover, the tank sludge flowed along with the discharge flow may collide with the filtration unit 21 and the tank sludge may accumulate in the groove a. However, since the comb teeth 41 of the fluid carrier exclusion part 4 scrapes off the sludge accumulated in the groove a, the clogging is eliminated immediately.

  The fluid carrier C introduced into the treatment tank A may be any member that can immobilize microorganisms. Among these, a gel-like member is preferably used. As the gel-like member, it is preferable to use a polyvinyl alcohol hydrogel. Polyvinyl alcohol hydrated gel is suitable for microbial carriers because it has a large number of hydroxyl groups and thus has high hydrophilicity and high affinity with a living body. Further, it is more preferable to use an acetalized polyvinyl alcohol hydrous gel. As a result, the amount of microorganisms retained can be further increased, and durability in repeated use can be ensured.

  Among them, an aqueous solution in which polyvinyl alcohol and a water-soluble polymer polysaccharide such as alginate are dissolved is dropped into an aqueous solution containing a polyvalent metal ion such as an aqueous calcium chloride solution, and then shaped into a spherical shape. It is preferable to use a spherical water-containing gel that has been acetalized using. By carrying out like this, since a uniform spherical gel is obtained, it becomes easy to set the width | variety of the groove groove a. Moreover, the durability in repeated use is further improved.

  When maintenance of the apparatus (main body 1) becomes necessary, the main part of the screen device can be easily removed from the processing tank A by releasing the connection between the connection mounting portion 13 and the connection portion 53 and pulling up the main body 1. Can be removed. Moreover, since the lid 15 and the drive source 31 that cover the upper part of the main body 1 are integrated, the screen 2 is removed from the main body 1 by removing the nut that holds the suspension ring 14. You can also. At this time, since the comb-tooth portion 41 protrudes and meshes with the concave groove a, the fluid carrier exclusion portion 4 suspended from the lower side surface of the main body 1 is also removed.

  Next, a screen device according to another embodiment of the present invention will be described. In the following description, only differences from the above-described screen device will be described, and the same components are denoted by the same reference numerals, and the description thereof is omitted. FIG. 8 is a view showing a screen device according to another embodiment of the present invention. As shown in FIG. 8, a handle 16 is provided on the lid 15 covering the upper part of the main body 1. Further, the lid 15 and the main body 1 are fixed with a patchon lock 17.

  Further, in the screen device shown in FIG. 1, the fluid carrier exclusion portion 4 is fixed to the lower side surface of the main body 1 with a bolt or the like, but in the screen device shown in FIG. 8, the fluid carrier exclusion portion 4 is welded to the water inlet 11 or the like. Is integrated. In the screen apparatus shown in FIG. 1, when removing the screen part 2 from the main body 1, it is necessary to remove the fluid carrier exclusion part 4 in advance. However, in the screen apparatus shown in FIG. 8, the screen unit 2 can be easily detached from the main body 1 together with the fluid carrier exclusion unit 4 simply by releasing the patch lock 17 and pulling up the handle 16. Therefore, when the maintenance of the screen part 2 becomes necessary, there is an advantage that the screen part 2 and the fluid carrier exclusion part 4 can be easily removed while leaving the heavy main body 1 in the processing tank A. .

  Further, in the screen device shown in FIG. 1, the members constituting the comb teeth portion 41 cannot be removed from the fluid carrier exclusion portion 4 (see FIG. 2). However, in the screen device shown in FIG. Only the members constituting 41 can be removed from the fluid carrier exclusion portion 4 (see FIG. 9). Therefore, when maintaining the comb tooth portion 41, it is only necessary to remove the members constituting the comb tooth portion 41, so that the workability is improved as compared with the case where the entire fluid carrier exclusion portion 4 is removed.

  When the main body 1 is assembled into the processing tank A, the connection mounting portion 13 is inserted into the inner groove portion 531 from above the connection portion 53 using the handle 16 at the top of the main body 1. And the connection mounting part 13 is mounted in the downward support protrusion 532, and the main body 1 is stood up in the process tank A by uniting the connection mounting part 13 and the connection part 53 in the said state. In the case where it is not assumed that the connecting and mounting portion 13 and the connecting portion 53 are fixed using bolts, it is not necessary to provide a hole for inserting the bolt as shown in FIG.

  When maintenance of the device (main body 1) becomes necessary, the main part of the screen device can be easily removed from the processing tank A simply by pulling up the handle 16 of the main body 1.

  A preferred embodiment of the present invention is a wastewater treatment method using a screen device, wherein the wastewater is treated with microorganisms immobilized on a fluid carrier in the wastewater treatment tank. .

  The fluid carrier introduced into the wastewater treatment tank may be any member that can immobilize microorganisms, and the fluid carrier described above can be used. Further, the method of supporting the microorganisms on the fluid carrier is not limited, and a method of adding the microorganisms previously supported on the fluid carrier to the wastewater treatment tank may be adopted, or the fluid carrier and sludge are added to the wastewater treatment tank. May be adopted in which the microorganisms contained in the sludge are supported on a fluid carrier.

DESCRIPTION OF SYMBOLS 1 Main body 11 Water inlet part 12 Drain pipe part 13 Connection mounting part 14 Suspension ring 15 Lid 16 Handle 17 Patch lock 2 Screen part 21 Filtration part 211 Bottom plate 212 Laminated ring board 213 Gap formation body 214 Lower through-hole board 215 Laminated connecting bolt Part 22 Resin cylinder 221 Step part 23 Upper through-hole plate 231 Shaft coupling part 232 Arm plate 233 Ring plate part 3 Drive mechanism 31 Drive source part 32 Drive shaft 4 Fluid carrier exclusion part 41 Comb tooth part 5 Mounting drain part 51 Drain pipe Part 52 wall surface mounting plate part 53 connecting part 531 inner groove part 532 downward support protrusion

Claims (5)

A screen device installed in a wastewater treatment tank;
The screen device has a fluid carrier exclusion portion and a drive mechanism attached to the main body,
The main body includes a water intake portion that takes in the treated water in the treatment tank and a drainage portion that discharges the treated water to the outside of the treatment tank, and the water intake portion is rotatable and provided with a filtration portion on the peripheral surface. Having a bottom cylindrical screen,
The fluid carrier exclusion part is arranged so as to be close to or in contact with the rotating peripheral surface of the screen part,
The screen device, wherein the drive mechanism rotates the screen unit.   2. The filter part according to claim 1, wherein the filtration part is formed by a water passage hole provided in a multi-stage groove groove along a rotation direction, and the fluid carrier exclusion part is formed in a comb-tooth shape meshing with the groove groove. Screen device.   The main body is a vertical tube type, a drive source portion of the drive mechanism is provided at the upper portion of the main body, the water inlet portion is provided at the lower end, the drainage portion is provided laterally on the side surface, and the The screen device according to claim 1, wherein a drive shaft is provided in the main body, and the screen portion and the drive source portion provided at a lower end of the drive shaft are connected by the drive shaft.   The said drainage part is comprised from the drainage cylinder part protrudingly provided from the said main body, and the mounting | wearing drainage part with which the said processing tank is mounted | worn, The connection / detachment structure is provided in the said drainage part and the said mounting | wearing drainage part. Screen device.   It is a wastewater treatment method using the screen apparatus in any one of Claims 1-4, Comprising: Wastewater treatment method characterized by processing wastewater with the microorganisms fix | immobilized by the fluid support | carrier in the said wastewater treatment tank.

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