JP2019177358A - Stirring device - Google Patents

Abstract

To provide a stirring device which can discharge only treatment water with no carrier from a treatment tank to the outside.SOLUTION: A stirring device of the invention includes: a treatment tank in which a liquid with a carrier is placed; a rotary vane provided within the treatment tank; a stator vane fixed to a bottom part of the treatment tank and extending radially; and a carrier separation chamber. The carrier separation chamber comprises: a passage chamber part having an upper opening and a lower opening which are formed so as to communicate with the treatment tank; and a separation chamber part having a drainage opening which is formed so as to communicate with a lower part of the passage chamber part and a discharge port provided at an upper part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an agitation device, and more particularly to an agitation device such as a microbial reaction device or a waste water treatment device for treating a liquid such as waste water having a carrier carrying microorganisms or a catalyst while stirring.

  In order to treat the wastewater, there is a method of purifying the wastewater by stirring a carrier carrying microorganisms or a catalyst in the wastewater.

  19 and 20 show a stirring device such as a conventional microbial reactor, 1 is a stirring device, 2 is a treatment tank of the stirring device 1, and the treatment tank 2 is, for example, a tank diameter (diameter). 1 to 10 m, and the height is a vertical cylindrical shape having a height of 0.5 to 5 times the tank diameter.

  3 indicates a rotating blade, and the rotating blade 3 has, for example, a blade diameter of 0.3 to 0.6 times the tank diameter, and a rotating blade suspended from the upper part of the processing tank 2 It is radially fixed to the lower end of the shaft 3a in the radial direction.

  The rotary blade 3 is composed of, for example, a rectangular blade plate such as four flat paddle blades, and is placed in the processing tank 2 via the rotary shaft 3a by a driving means (not shown) such as a motor. It is provided to rotate in the upper part of the liquid contained up to a desired height, for example, in the vicinity of the liquid level.

  Reference numeral 4 denotes a stationary blade. The stationary blade 4 is composed of, for example, a plurality of linear strips of four sheets, and is radially equiangular at the center of the bottom 2a of the processing tank 2 below the rotary blade 3. It is fixed to be separated.

  Further, for example, as shown in FIG. 20, the center portions of the strips corresponding to the intersecting portions of the strip plates have a gap 5 therebetween, and the strip plates are, for example, The rotary blade 3 is fixed in parallel at a distance d from a radial line R passing through the center of the bottom 2a in front of the rotating direction of the rotary blade 3.

  Reference numeral 6 denotes an inflow pipe. The inflow pipe 6 is provided, for example, in a lower portion of the side wall of the processing tank 2 so as to contain a liquid such as processing water to be processed in the processing tank 2. . The inflow pipe 6 may be provided in the upper part of the processing tank 2.

  Reference numeral 7 denotes a carrier separation chamber. The carrier separation chamber 7 is formed of, for example, a box extending in the vertical direction, and is provided outside the side wall of the processing tank 2, and at the lower end, the lower end of the side wall of the processing tank 2. A discharge port 9 for discharging the waste water is provided in the upper part, communicating with the opening 8 provided in the upper part.

  In the conventional stirring device, a liquid such as treated water having a carrier carrying microorganisms or a catalyst is allowed to flow into the treatment tank 2 to a desired height, and the rotating blade 3 is rotated, thereby As shown in FIG. 19, the treated water in the treatment tank 2 is discharged radially outward by the rotary blades 3 and comes into contact with the inner surface of the side wall of the treatment tank 2, and along the inner surface of the side wall. A gentle downward flow P toward the bottom of the tank is formed while swirling, and thereafter, an upward flow Q is caused by the stationary blade 4 at the center of the bottom of the processing tank 2. A circulation flow is formed between the blade and the stationary blade 4, and for example, the carrier can be prevented from being damaged by low shear and low power in the processing tank 2, and liquid can be mixed and uniformly dispersed. .

  Further, the treated water subjected to the biological treatment flows into the carrier separation chamber 7 through the opening 8, and the carrier contained in the treated water sinks downward in the carrier separation chamber 7, and the opening Only the treated water having no carrier returned from the section 8 into the treatment tank 2 is discharged to the outside from the upper discharge port 9.

JP 2000-246269 A

  However, in the conventional carrier separation chamber 7, the carrier that has entered the carrier separation chamber 7 is unlikely to return to the treatment tank 2, and only treated water without the carrier is efficiently discharged from the discharge port 9 to the outside. I couldn't.

  An object of the present invention is to provide an agitation device that has a simple configuration, prevents discharge of a carrier or the like to the outside of a treatment tank, and can efficiently discharge only treated water without a carrier to the outside.

  In order to achieve the above-mentioned object, the stirring device of the present invention extends in a radial manner fixed to a treatment tank containing a carrier-containing liquid, a rotary blade provided in the treatment tank, and a bottom of the treatment tank. The carrier separation chamber includes a stationary blade and a carrier separation chamber, and the carrier separation chamber has a channel chamber portion having an upper opening and a lower opening formed so as to communicate with the inside of the processing tank, and a lower portion of the channel chamber portion. And a separation chamber having a drain opening formed so as to communicate with the drain and an outlet provided in the upper part.

  In addition, a cover plate that is inclined toward the center side in the processing tank toward the front side in the rotation direction is provided on the rear side in the rotation direction of the rotary blade of the lower opening. Features.

  Further, the lower opening is formed such that an opening area of the lower opening is larger than an opening area of the upper opening.

  Further, the flow path chamber portion is characterized in that a flow passage cross-sectional area of an upper flow passage chamber portion is formed smaller than a flow passage cross-sectional area of a lower flow passage chamber portion.

  The carrier separation chamber is formed by a box having a first partition plate, and the flow path chamber portion and the separation chamber portion extend from a ceiling plate of the box to a desired position below. Each of the first partition plates is formed to be partitioned.

  Further, the flow path chamber portion is formed by an upper upper flow path chamber portion and a lower lower flow path chamber portion, and the upper upper flow path chamber portion extends downward from the ceiling plate of the flow path chamber portion. A second partition plate extending to a desired position is provided, and the second partition plate allows the flow passage cross-sectional area of the upper upper flow passage chamber portion to be less than the flow passage cross-sectional area of the lower lower flow passage chamber portion. Is also characterized by being formed small.

  Further, the first partition plate is provided with a rectifying unit having an inclined surface that is inclined downward toward the lower opening side at the lower part of the first partition plate.

  Further, a partition plate extending from the bottom surface to a desired height, which faces the first partition plate, is further provided in the separation chamber.

  INDUSTRIAL APPLICABILITY The present invention can provide a stirring device that has a simple configuration, prevents discharge of a carrier and the like to the outside of the treatment tank, and can efficiently discharge only treated water without a carrier to the outside.

It is a vertical side view of the stirring apparatus of Example 1 of this invention. It is a cross-sectional top view of the stirring apparatus of Example 1 of this invention. It is a vertical side view of the carrier separation chamber of the present invention. It is a front view of the support | carrier separation chamber seen from the inside of a processing tank of this invention. It is a perspective view for description of the carrier separation chamber of the present invention. It is a perspective view for explanation of a carrier separation room which separated a cover body of the present invention. It is a vertical side view of the other Example of the carrier separation chamber of this invention. It is a vertical side view for description of the carrier separation chamber of the present invention. It is a schematic diagram for description of the carrier separation chamber of the present invention. It is a schematic diagram for description of the carrier separation chamber of the present invention. It is a schematic diagram for description of the carrier separation chamber of the present invention. It is a perspective view for description of the carrier separation chamber of the second embodiment of the present invention. It is a front view for description of the carrier separation chamber of the second embodiment of the present invention as seen from inside the treatment tank. It is a vertical side view for description of the carrier separation chamber of the third embodiment of the present invention. It is a perspective view for description of other Examples of the carrier separation chamber of 3rd Example of this invention. It is a vertical side view for description of the other Example of the carrier separation chamber of 3rd Example of this invention. It is a front view of the other example of the support | carrier separation chamber seen from the inside of a processing tank of this invention. It is a front view of the further another example of the carrier separation chamber seen from the inside of the treatment tank of the present invention. It is a vertical side view of the conventional stirring apparatus. It is a cross-sectional top view of the conventional stirring apparatus.

  The example of the form for carrying out the present invention is shown below. In addition, the same code | symbol is attached | subjected to the same part as the said prior art example, and description is abbreviate | omitted.

  A first embodiment of the present invention will be described with reference to FIGS.

(1. Explanation of carrier separation chamber)

  The stirring device 10 of the present invention is provided with a carrier separation chamber 11 outside the side wall of the processing tank 2 instead of using the carrier separation chamber 7 in the conventional stirring device 1.

  As shown in FIGS. 1 and 2, the carrier separation chamber 11 includes two chambers arranged in parallel in the front-rear or right-and-left direction of the flow path chamber portion 12 and the separation chamber portion 13. Further, the flow path chamber 12 is formed to extend in the vertical direction, and the upper opening 14 is formed so as to communicate with the inside of the treatment tank 2 so that treated water from the inside of the treatment tank 2 flows in, The lower opening 15 provided below the upper opening 14 is formed so as to communicate with the treatment tank 2 so that the treated water flowing into the flow path chamber 12 flows into the treatment tank 2. And have. Further, the separation chamber portion 13 is formed to extend in the vertical direction, and is formed to communicate with the lower portion in the flow channel chamber portion 12 so that a part of the treated water in the flow channel chamber portion 12 flows in. The drainage opening 16 is provided in the lower part and the discharge port 17 is provided in the upper part.

  In order to make it easier for the treated water from the treatment tank 2 that has flowed into the flow path chamber 12 from the upper opening 14 to flow out from the lower opening 15 than from the drain opening 16. The upper end opening edge of the drain opening 16 of the separation chamber 13 is preferably the same height as the upper end opening edge of the lower opening 15 or slightly below.

(2. Explanation of cover body)

  Further, a cover plate 18a extending obliquely toward the central direction of the processing tank 2 toward the front side in the rotation direction is provided on the edge 15a on the rear side in the rotation direction of the rotary blade 3 of the lower opening 15. The cover body 18 may be provided to prevent the treated water swirling on the inner peripheral surface of the side wall in the treatment tank 2 from flowing into the flow path chamber portion 12 from the lower opening 15. .

(3. Description of an example of the carrier separation chamber)

  For example, as shown in FIGS. 3 to 6, the carrier separation chamber 11 includes left and right side walls 11 a and 11 b extending in the vertical direction and arranged in parallel with each other, and side walls of the treatment tank 2. A front plate 11c fixed to the outer peripheral surface, a back plate 11d arranged to face the surface of the front plate 11c, a bottom plate 11e, and a ceiling plate 11f extending horizontally, The upper opening 14 communicating with the processing tank 2 is formed at the upper end of the front plate 11c, and the lower opening 15 communicating with the processing tank 2 is formed at the lower end of the front plate 11c. Is done.

  The opening area of the lower opening 15 is preferably larger than the opening area of the upper opening 14.

  The carrier separation chamber 11 is provided below the processing tank 2, and, for example, as shown in FIG. 1, the height (L1) from the bottom of the processing tank is, for example, 0 with respect to the tank diameter. .1 to 0.5 times higher.

  The box-shaped carrier separation chamber 11 has a longitudinal length (L2) of 0.3 to 0.6 times the tank diameter, for example, as shown in FIGS. The length (L3) in the lateral direction (left-right direction) is 0.1 to 0.3 times the length of the tank diameter, and the length (L4) of the depth is 0.2 to 0. Four times as long.

  In the box, the box is partitioned into a front side and a back side between the front plate 11c and the back plate 11d. For example, both sides are connected to the left and right side walls 11a and 11b. A vertical rectangular first partition plate 19 extending from the ceiling plate 11f to a desired position below is provided.

  As shown in FIG. 3, the first partition plate 19 is separated from the front plate 11c by a desired distance (L5), for example, a distance of 0.05 to 0.2 times the tank diameter. Provided.

  The first partition plate 19 extends from the ceiling plate 11f to, for example, a height that is substantially the same position as the upper end edge of the lower opening 15, and between the lower end of the first partition plate 19 and the bottom plate 11e. The drainage opening 16 is formed.

  Then, the first partition plate 19 forms two chambers in the box, one room on one surface side of the first partition plate 19 and the other chamber on the other surface side, The flow path chamber portion 12 and the separation chamber portion 13 are formed respectively.

  That is, the box body is partitioned into, for example, two front and rear chambers by the first partition plate 19, the front surface side is the flow channel chamber portion 12, and the rear surface side is the separation chamber portion 13.

  The front plate 11c may be constituted by the side wall of the processing tank 2 itself.

  The upper opening 14 is formed in, for example, a rectangular opening, and the horizontal direction (left and right direction) extends from the left side wall 11a to the right side wall 11b, and the vertical direction (vertical direction) is the ceiling. A desired length (L6), for example, 0.01 to 0.1 times the tank diameter is formed downward from the plate 11f.

  The lower opening 15 is formed in, for example, a rectangular opening, and the horizontal direction (left and right direction) extends from the left side wall 11a to the right side wall 11b, and the vertical direction extends from the bottom plate 11e. A desired length (L7) is formed above, for example, 0.05 to 0.2 times the tank diameter. The vertical length (L7) of the opening of the lower opening 15 is preferably larger than the vertical length (L6) of the opening of the upper opening 14. The treated water in the flow path chamber 12 is easily discharged into the treatment tank 2 through the lower opening 15.

  For example, the bottom plate 11e may be inclined linearly as shown in FIG. 7 in addition to being concavely curved as shown in FIG.

  Further, the bottom plate 11e may extend horizontally from the edge of the lower opening 15 and be inclined linearly upward from there to be connected to the back plate 11d.

  In addition to providing the lower opening 15 directly below the upper opening 14 as shown in FIG. 4, for example, as shown in FIG. 17, the upper opening 14 is arranged in the rotational direction of the rotary blade 3. The lower opening 15 is formed on the front side of the rotating blade 3 in the rotation direction, and the lower opening 15 is rotated with respect to the upper opening 14 in the rotating direction of the rotating blade 3. However, it may be provided obliquely below the front side.

  Further, as shown in FIG. 18, the flow path chamber portion 12 may be inclined obliquely downward so as to face the front side with respect to the rotation direction of the rotary blade 3 as it goes downward.

  Thus, the flow rate of the liquid flowing into the flow path chamber 12 from the processing tank 2 can be increased, and the carrier in the liquid can easily return from the lower opening 15 into the processing tank 2.

(4. Description of an example of a cover body)

  Further, for example, as shown in FIGS. 5 and 6, the cover body 18 is provided on the front side in the rotational direction of the lower opening 15 provided at the edge 15 a on the rear side in the rotational direction of the rotary blade 3. A rectangular cover plate 18a having a size substantially covering the lower opening 15 extending obliquely toward the center side of the processing tank 2, and an upper side of the cover plate 18a and the lower opening 15 A front side in the rotational direction, which includes a substantially triangular upper plate 18b connected to the upper edge, and a substantially triangular lower plate 18c connected to the lower edge of the cover plate 18a and the lower edge of the lower opening 15. In addition, it is formed in a cylindrical shape having a triangular cross section in which a substantially square opening 18d is formed.

  Then, the treated water from the flow path chamber 12 flows into the cover body 18 through the lower opening 15 and is discharged into the treatment tank 2 from the opening 18d of the cover 18. become.

  The lower plate 18c may be omitted and the lower portion of the cover body 18 may be opened.

  The cover body 18 prevents the treated water in the treatment tank 2 from flowing backward from the lower opening 15 into the flow path chamber 12, and the treated water in the flow path chamber 12 is treated in the treatment tank. It becomes easy to flow out in.

(5. Explanation of wastewater treatment methods and effects)

  Next, the processing method and effect by the stirring apparatus of Example 1 will be described.

  From the inflow pipe 6, a liquid such as treated water having a carrier carrying microorganisms or a catalyst is allowed to flow into the processing tank 2 to a desired height, and the liquid is stored in the processing tank 2. .

  By rotating the rotary blade 3, treated water having a carrier is discharged radially outward by the rotary blade 3 in the treatment tank 2 shown in FIG. 1, as in the conventional apparatus shown in FIG. Then, a downward flow P gently flowing toward the bottom 2a of the processing tank 2 is formed while flowing downwardly in contact with the inner surface of the side wall of the processing tank 2 and turning the inner surface of the side wall of the processing tank 2, and thereafter the processing tank 2 2, an upward flow Q is caused by the stationary blade 4 at the bottom of the central portion of the center portion 2, thereby forming a circulating flow between the rotating blade 3 and the stationary blade 4. It becomes possible to achieve water mixing and uniform dispersion.

  Further, as shown in FIG. 8, a part of the swirling downward flow P flows into the flow channel chamber 12 from the upper opening 14, and the flow of the downward flow P in the flow channel chamber 12. A downward flow R having a relatively strong flow is formed, descends in the flow path chamber 12 and returns to the processing tank 2 from the lower opening 15. At this time, the flow path chamber 12 The carrier having a higher specific gravity than the treated water flowing inside is returned to the treatment tank 2 through the cover body 18 from the lower opening 15 together with the descending flow R.

  Then, as shown in FIG. 8, only treated water without a carrier flows into the drain opening 16, and the downward flow toward the discharge port 17 enters the separation chamber 13. A discharge flow S that is weaker than R is formed, and only treated water without a carrier can be discharged from the discharge port 17 to the outside of the tank.

  Even if a part of the carrier flows into the separation chamber 13, the carrier whose specific gravity is heavier than that of the treated water settles downward and enters the flow path chamber 12 through the drainage opening 16. Returning to the processing tank 2 from the lower opening 15.

  Further, the cover body 18 prevents the swirling flow in the processing tank 2 from entering the lower opening 15, so that the downward flow R in the flow path chamber portion 12 is not hindered, and the carrier Outflow into the processing tank 2 is performed smoothly.

(6. Description of another embodiment of partition plate)

  In the first partition plate 19 formed in the vertical shape, as shown in FIG. 9, a rotating flow is generated in the lower part in the separation chamber 13 and the carrier in the flow path chamber 12 is caught. May enter the separation chamber 13.

  Therefore, as shown in FIG. 10, the lower part of the first partition plate 19 has an inclined surface 20 a that is inclined toward the lower opening 15 as it goes downward from above, for example, a triangular triangle. A columnar rectification unit 20 is provided.

  Due to the inclined surface 20 a of the rectifying unit 20, the treated water passing through the flow path chamber 12 flows toward the lower opening 15, and a rotating flow is generated at the lower part of the lower surface of the rectifying unit 20. As a result, the carrier is less likely to be caught in the separation chamber section 13.

  As shown in FIG. 10, the rectifying unit 20 having a triangular cross section is formed such that a lower surface 20 b toward the partition plate 19 extends upward from a lower end of the inclined surface 20 a, and the lower surface 20 b and the An angle formed with the first partition plate 19 is formed in an obtuse angle. In this case, a rotating flow is formed under the lower surface 20b, and a part of the rotating flow is in the separation chamber portion 13. As a result, the carrier in the flow path chamber 12 may be caught in the separation chamber 13.

  Therefore, as shown in FIG. 11, the lower surface 20b is an inclined surface that is inclined downward, and the triangle formed between the lower surface 20b and the first partition plate 19 has an acute angle or a right angle. By providing the columnar rectification unit 20, a rotating flow formed on the lower surface may be generated on the flow channel chamber side so that the carrier in the flow channel chamber is not caught in the separation chamber.

(7. Description of another embodiment of carrier separation chamber)

  In the carrier separation chamber 21 according to the second embodiment of the present invention, in the first embodiment, the flow passage chamber portion 12 of the carrier separation chamber 11 is different from the flow passage cross-sectional area of the lower flow passage chamber portion. The upper opening portion 14 is formed in the upper flow passage chamber portion, and the lower opening portion 15 is formed in the lower flow passage portion. It is made to form in a channel room part.

(8. Description of an example of another embodiment of the flow path chamber)

  The flow path chamber portion 12 of the carrier separation chamber 21 is formed by, for example, an upper upper flow path chamber portion 12a and a lower lower flow path chamber portion 12b, and the upper flow path chamber portion 12a is, for example, illustrated in FIG. As shown in FIGS. 12 and 13, a second partition plate 22 for narrowing the upper flow path is provided in the flow path chamber portion 12 of the carrier separation chamber 11 of the first embodiment. 2 partition plates 22, the first partition plate 19, the right side wall 11b, and the front plate 11c, and the lower flow path chamber portion 12b is formed of the upper flow path chamber. It is comprised by the said flow path chamber part 12 of the lower part of the part 12a.

  And as shown in FIG.12 (b), the flow-path cross-sectional area A of the said lower flow path chamber part 12b comes to be largely formed with respect to the flow-path cross-sectional area B of the said upper flow path chamber part 12a. .

  The upper opening 14 is formed in the upper part of the upper flow channel chamber 12a with the flow channel narrowed, and the lower opening 15 is formed in the lower flow channel chamber 12.

  The second partition plate 22 divides, for example, an intermediate portion between the left side wall 11a and the right side wall 11b, for example, at an intermediate portion, on the left side and the right side. The front and rear sides are connected to the front plate 11c and the partition plate 19, and are formed in a vertical rectangular shape extending from the ceiling plate 11f to the lower end of the partition plate 19 (or the upper edge of the lower opening). .

  The upper opening 14 is formed at the upper end of the front plate 11c between the second partition plate 22 and the right side wall 11b.

  The first partition plate 19 may omit a portion unnecessary for the configuration of the upper flow path chamber portion 12a, for example, a portion from the left side wall 11a to the second partition plate 22.

  The upper opening 14 is formed in, for example, a rectangular opening, the horizontal direction (left-right direction) extends from the second partition plate 22 to the right side wall 11b, and the vertical direction (vertical direction) is A desired length is formed below the ceiling plate 11f.

  Note that the length of the upper opening 14 in the vertical direction (vertical direction) is, for example, 0.01 to 0.1 times the tank diameter, and the vertical direction of the lower opening 15, similar to L6. The length in the (up and down direction) is, for example, 0.05 to 0.2 times the tank diameter, similar to L7.

(9. Wastewater treatment methods and effects)

  In the second embodiment of the present invention, when the treated water that has flowed into the flow path chamber portion 12 flows from the upper flow path chamber portion 12a into the lower flow path chamber portion 12b, the flow velocity becomes slow. , The carrier is easily discharged from the lower opening 15, so that the carrier does not enter the separation chamber 13 through the drainage opening 16.

  For example, in the carrier separation chamber 21 of the second embodiment, as shown in FIG. 14, the separation chamber portion 13 has a desired upper side from the bottom plate 11 e facing the surface of the first partition plate 19. You may make it provide the perpendicular | vertical rectangular-plate-shaped partition board 23 extended to.

  The partition plate 23 is connected to the left and right side walls 11a and 11b of the carrier separation chamber 21 on both sides thereof, for example, with respect to the first partition plate and a desired distance (L8), for example, the tank diameter. And spaced apart by a distance of 0.01 to 0.05 times.

  The discharge port 17 is provided, for example, in the ceiling plate 11f between the partition plate 23 and the back plate 11d.

  As described above, by providing the partition plate 23 in the separation chamber 13, it is possible to prevent the carrier from flowing into the separation chamber 13.

  15 and 16 show an example in which the upper end side of the partition plate 23 and the back plate 11d are closed by the closing plate 24 in the carrier separation chamber 13. FIG.

  Also in this embodiment, the carrier can be separated as shown in FIG.

  The stirrer of the present invention can be used for anaerobic treatment, aerobic treatment, denitrification / nitrification treatment, etc., and is used in industrial wastewater and domestic wastewater such as electronic industry, food, livestock, agriculture, office, sewage, etc. Is available.

DESCRIPTION OF SYMBOLS 1 Stirring apparatus 2 Processing tank 2a Bottom part 3 Rotary blade 3a Rotating shaft 4 Stator blade 5 Gap 6 Inflow pipe 7 Carrier separation chamber 8 Opening part 9 Outlet 10 Stirrer 11 Carrier separation chamber 11a Left side wall 11b Right side wall 11c Front plate 11d Back plate 11e Bottom plate 11f Ceiling plate 12 Channel chamber portion 12a Upper channel chamber portion 12b Lower channel chamber portion 13 Separation chamber portion 14 Upper opening portion 15 Lower opening portion 15a Edge portion 16 Drainage opening portion 17 Discharge port 18 Cover body 18a Cover plate 18b Upper plate 18c Lower plate 18d Opening portion 19 First partition plate 20 Rectifying portion 20a Inclined surface 20b Lower surface 21 Carrier separation chamber 22 Second partition plate 23 Screen plate 24 Closing plate

Claims (8)

A treatment tank containing a liquid having a carrier;
A rotor blade provided in the treatment tank;
A radially extending stationary blade fixed to the bottom of the treatment tank;
Consisting of a carrier separation chamber,
The carrier separation chamber includes a flow channel chamber having an upper opening and a lower opening formed so as to communicate with the inside of the treatment tank, and a drain opening formed so as to communicate with a lower portion of the flow channel chamber. A stirring device comprising a separation chamber having a discharge port provided at an upper portion.   A cover plate is provided on the rear side of the lower opening portion in the rotational direction of the rotary blade, and is inclined toward the front side in the rotational direction toward the center direction side in the processing tank. The stirring device according to claim 1.   The stirring device according to claim 1 or 2, wherein the lower opening is formed such that an opening area of the lower opening is larger than an opening area of the upper opening.   The flow passage chamber portion is formed so that a flow passage cross-sectional area of an upper flow passage chamber portion is smaller than a flow passage cross-sectional area of a lower flow passage chamber portion. 3. The stirring device according to 3. The carrier separation chamber is formed by a box having a first partition plate,
2. The flow path chamber portion and the separation chamber portion are respectively formed by being partitioned by the first partition plate extending from a ceiling plate of the box to a desired position below. The stirring device according to 2, 3, or 4. The flow path chamber portion is formed by an upper upper flow path chamber portion and a lower lower flow path chamber portion,
The upper upper channel chamber part is provided with a second partition plate extending from the ceiling plate of the channel chamber part to a desired position below,
6. The flow path cross-sectional area of the upper upper flow path chamber portion is formed smaller by the second partition plate than the flow path cross-sectional area of the lower lower flow path chamber portion. A stirrer described in 1.   The stirrer according to claim 5 or 6, wherein a rectifying unit having an inclined surface inclined downward toward the lower opening is provided at a lower portion of the first partition plate. The stirrer according to claim 5, 6 or 7, further comprising a partition plate facing the first partition plate and extending from the bottom surface to a desired height in the separation chamber.

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