JP2013046898A - Solid-liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separator in which the floc formed in a flocculation tank is introduced into a sedimentation tank without being decomposed, and the floc is surely precipitated by the sedimentation tank.SOLUTION: The solid-liquid separator includes: a flocculation tank 15 that performs a flocculation process to a pollutant; and a sedimentation tank 30 that make the pollutant precipitate, wherein the sedimentation tank is a swirl flow type sedimentation tank in which a swirl flow is generated in the sedimentation tank by the driving force of a coagulation-treated water itself that goes into; a common use part 16 that shares a peripheral wall surface is formed at peripheral walls 3, 31 of the flocculation tank and the sedimentation tank, and a communication port 17 that communicates the flocculation tank and the sedimentation tank; a flocculation tank vertical baffle 35 that leads the treated water to the communication port is provided in the flocculation tank, and a sedimentation tank vertical baffle 36 that leads the coagulation-treated water from the communication port to the sedimentation tank is provided in the sedimentation tank; the flocculation tank vertical baffle and the sedimentation tank vertical baffle are disposed to sandwich the communication ports between them.

Description

  The present invention relates to a solid-liquid separator. More specifically, a solid-liquid separation device that adds a flocculant to the water to be treated to agglomerate the pollutant, solid-liquid separates the agglomerated water, precipitates the pollutant, and separates and removes the pollutant About.

  As a solid-liquid separation device that introduces contaminated water into a swirling flow settling tank and separates it into solid and liquid, Patent Document 1 discloses a first solid-liquid separation means such as a vortex solid-liquid separation device or a bar screen. Then, the flocculant is added by the flocculant addition means to aggregate the pollutant in the water to be treated, and then the water to be treated is clarified by the second solid-liquid separation means which is a vortex type solid-liquid separation device. And a solid-liquid separator that separates into a solid content. In this solid-liquid separator, the flocculant is aggregated by the flocculant addition means to form a floc, and this floc-containing water is introduced into the vortex-type solid-liquid separator and solid-liquid separated.

  Patent Document 2 discloses a solid-liquid separation apparatus relating to an apparatus for solid-liquid separation by providing a capture material for capturing solids or the like in a cylindrical separation tank in a cylindrical shape and causing water to be treated to flow in an annular shape. Is described.

  Non-Patent Document 1 discloses a swirl type precipitation in which a cylindrical screen is provided as a settling tank for swirling and flowing the water to be treated inside the settling tank, and contaminants contained in the water to be treated are captured by the screen. The tank is listed.

JP 2004-209306 A Japanese National Patent Publication No. 10-504227

“Resource Environment Measures” Vol. 41, no. 6, pp. 42 (2005)

  In the solid-liquid separation device disclosed in Patent Document 1, since the coagulated water is introduced into the swirl type sedimentation tank through a pipe or the like, resistance and impact are applied to the formed floc when passing through the pipe or the like. The floc is broken down into fine suspended solids. Since the finely decomposed suspended matter flows out of the swirling settling tank together with the treated water, the quality of the treated water is deteriorated.

  In the solid-liquid separation apparatus disclosed in Patent Document 2 and Non-Patent Document 1, the screen for capturing the pollutant is likely to be clogged, and it is difficult to perform solid-liquid separation stably.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to introduce flocs formed in a coagulation tank into a settling tank without decomposing, and to efficiently precipitate the flocs in the settling tank. An object of the present invention is to provide a solid-liquid separator that can be used.

  The solid-liquid separation device of the present invention is a method of precipitating pollutants by solid-liquid separation of an agglomeration tank for adding a flocculant to the water to be treated and aggregating the pollutant, and aggregating water agglomerated in the agglomeration tank In the solid-liquid separation device, which is a swirl flow settling tank that generates a swirl flow inside the settling tank with the driving force of the aggregating treated water itself entering, The coagulation tank and the settling tank are installed close to each other so that the distance L between centers thereof satisfies the relationship of Lmin ≦ L ≦ Lmax with respect to Lmin and Lmax defined below. To do.

Lmin: (R + r) × 0.8,
Lmax: (R + r) × 1.2 or (R + r + d), whichever is larger,
r: agglomeration tank radius,
R: Settling tank radius,
d: width of the flow path for allowing the flocculated water to communicate from the flocculation tank to the settling tank when the flocculation tank and the settling tank are separated

  In the solid-liquid separation device according to the present invention, the coagulation tank and the precipitation tank are close to each other. Therefore, since unnecessary load and impact are not given to the flocculated water, the floc formed in the flocculation tank can be moved to the precipitation tank without being destroyed. For this reason, in the settling tank, flocs exist in a state of large flocs that are likely to settle, and precipitate efficiently.

  The coagulation tank is provided with a first vertical baffle that guides the coagulation treatment water of the coagulation tank to the liquid flow path, and the coagulation tank has a second vertical baffle that guides the coagulation treatment water from the liquid flow path to the precipitation tank. A vertical baffle may be provided. In this case, the flocculated water smoothly enters the settling tank from the coagulation tank, and the floc formed in the coagulation tank passes through the liquid passage without receiving excessive resistance. For this reason, the floc formed in the coagulation tank moves to the settling tank in a state where the size is maintained without being almost destroyed, and is efficiently precipitated in the settling tank.

  In the present invention, a common part that shares a peripheral wall surface is formed in the peripheral wall part of the coagulation tank and the peripheral wall part of the settling tank, and the communication part that connects the coagulation tank and the settling tank to the common part. A communication port as a liquid channel may be provided. If comprised in this way, destruction of the floc at the time of transferring from a coagulation tank to a sedimentation tank is further prevented.

  When the first and second vertical baffles are substantially parallel, the advancing direction of the agglomerated treated water guided to the communication port can coincide with the advancing direction of the agglomerated treated water entering the sedimentation tank from the communicating port, It is possible to more effectively prevent an unnecessary load or impact from being applied to the flocculated water, and to prevent breakage of the floc.

  The first and second baffles may be obliquely crossed at an intersecting angle of 30 to 60 ° with respect to the radial direction of each tank. In this way, the agglomerated water is efficiently contained inside the settling tank. The agglomerated water can enter the settling tank in a suitable direction of swirling.

  When the height dimension of the first and second vertical baffles and the length dimension extending from the common part are set to 1/100 to 1/10 of the diameter of the sedimentation tank, the flocculated water is surely connected from the aggregation tank. While allowing it to pass through to the settling tank, it is possible to prevent the progress of the flocculated water from being inhibited. It is also possible to prevent the formed flock from colliding with the first and second vertical baffles.

  When the height dimension of the communication port is formed to be 50 to 100% of the height dimension of the first and second vertical baffles, the first vertical baffle is agglomerated in all regions in the height direction of the communication port. The water can be guided, and the second vertical baffle allows the flocculated water immediately after entering the flocculation tank from the communication port to flow into the settling tank without abruptly changing the traveling direction.

  When the aggregating tank is provided with a stirring device for agitating the agglomerated water inside, the aggregating agent added to the aggregating tank can be applied to the water to be treated without any unevenness, and flocs can be formed effectively.

  When the stirrer is configured to apply a turning force to the agglomerated treated water in a direction opposite to the direction in which the first vertical baffle guides the agglomerated treated water to the communication port, the flow rate of the agglomerated treated water guided to the communication port and The flow rate can be stabilized, and the agglomerated water can enter the settling tank without drifting. Therefore, a stable swirl flow can be formed inside the settling tank.

  In the settling tank, a swivel assist device for assisting swirling of the agglomerated treated water that has entered the inside of the settling tank is provided, and the swirl portion is disposed at a position below the lower end of the second vertical baffle. The coagulated water can be stably swirled inside the settling tank without causing the auxiliary device to interfere with the second vertical baffle.

  The swivel assist device includes a rotating shaft that extends vertically in the axial center of the settling tank, and a plurality of rotating arms that extend radially from a lower portion of the rotating shaft, and the rotating arm is When it is set as the structure located below the lower end of 2 vertical baffles, since a some rotation arm assists turning, suitable turning force can be given to coagulation treated water.

It is a cross-sectional view of the solid-liquid separation device according to the first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the II-II cross section of FIG. It is explanatory drawing which shows the relationship of the height dimension of a communicating port, a 1st vertical baffle, and a 2nd vertical baffle. It is explanatory drawing which shows the length dimension extended from the inclination of a 1st vertical baffle and a 2nd vertical baffle with respect to the tangent of the surrounding wall part of a sedimentation tank in the position corresponding to a communicating port, and a shared part. It is a cross-sectional view of the solid-liquid separation device according to the second embodiment of the present invention. It is a cross-sectional view of the solid-liquid separator which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the VII-VII cross section of FIG. It is a cross-sectional view of the solid-liquid separator which concerns on 4th Embodiment of this invention. It is a cross-sectional view of the solid-liquid separation device according to Comparative Example 1. It is a cross-sectional view of the solid-liquid separation device according to Comparative Example 2. It is a block diagram of the solid-liquid separator which concerns on 5th Embodiment. It is a block diagram of the solid-liquid separator which concerns on 6th Embodiment. It is a block diagram of the solid-liquid separator which concerns on 7th Embodiment. It is a block diagram of the solid-liquid separator which concerns on 8th Embodiment. It is a block diagram of the solid-liquid separator which concerns on 9th Embodiment. It is a block diagram of the solid-liquid separator which concerns on 10th Embodiment. It is a block diagram of the solid-liquid separator which concerns on 11th Embodiment. It is a block diagram of the solid-liquid separator which concerns on the comparative example 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1-8, the solid-liquid separators 1A, 1B, 1C, and 1D are agglomeration tanks 15 and 60 for aggregating and treating pollutants by adding a flocculant to the water to be treated. Cylindrical sedimentation tanks 30 and 80 for solid-liquid separation of the agglomerated treated water and sedimenting contaminants are provided. The settling tanks 30 and 80 are swirl flow type settling tanks that generate a swirl flow inside the settling tanks 30 and 80 by the driving force of the coagulation treated water itself entering from the coagulation tanks 15 and 60. Moreover, the shared wall parts 16 and 62 which share a peripheral wall surface are formed in the surrounding wall parts 3 and 61 of the aggregation tanks 15 and 60, and the surrounding wall parts 31 and 81 of the sedimentation tanks 30 and 80, and the shared parts 16 and 62 are used. Are provided with communication ports 17 and 63 that allow the aggregation tanks 15 and 60 and the precipitation tanks 30 and 80 to communicate with each other.

  Inside the agglomeration tanks 15, 60 are provided first vertical baffles (hereinafter referred to as first vertical baffles) 35, 70 for guiding the agglomerated treated water of the aggregation tanks 15, 60 to the communication ports 17, 63, and In the settling tanks 30 and 80, second vertical baffles 36 and 71 for guiding the agglomerated treated water from the communication ports 17 and 63 to the settling tanks 30 and 80 are provided. The first vertical baffles 35 and 70 and the second vertical baffles (hereinafter referred to as second vertical baffles) 36 and 71 are arranged so as to sandwich the communication ports 17 and 63 therebetween.

  If the water to be treated is subjected to solid-liquid separation using the solid-liquid separation devices 1A, 1B, 1C, 1D, the coagulation tanks 15, 60 and the precipitation tanks 30, 80 are communicated only with the communication ports 17, 63. Therefore, it can be made to move to the sedimentation tanks 30 and 80, without giving unnecessary load to the coagulation treated water coagulated in the coagulation tanks 15 and 60. For this reason, when the flocculated water is transferred from the flocculation tanks 15 and 60 to the settling tanks 30 and 80, it is possible to prevent the flocs formed in the flocculation tanks 15 and 60 from being decomposed, and the flocs are settled as they are. The tanks 30 and 80 can be moved. As a result, it is possible to achieve a special effect of sending out the treated water from which the contaminants have been reliably removed from the solid-liquid separator.

  1-4, the solid-liquid separation device 1A of the first embodiment is provided with a stirring device 20 in the flocculation tank 15, and the first vertical baffle 35 uses the flocculated water for the flocculated water in the flocculation tank 15. A swirling force is applied to the coagulated water in the same direction as the direction leading to the communication port 17.

  In the solid-liquid separation device 1B of the second embodiment in FIG. 5, the first vertical baffle 35 gives a swirl force to the flocculated water in the direction opposite to the direction in which the flocculated water is guided to the communication port 17.

  The solid-liquid separation device 1 </ b> C of the third embodiment shown in FIGS. 6 and 7 is provided with a swirl assist device 40 in the sedimentation tank 30 to assist the swirl of the coagulated treated water that has entered the sedimentation tank 30.

  In the solid-liquid separation device 1D of the fourth embodiment in FIG. 8, a mixing tank 50 and a coagulation tank 60 are provided separately and these mixing tanks 50 and the coagulation tank 60 are connected by a transfer pipe 58.

[First Embodiment (FIGS. 1 to 4)]
In the solid-liquid separator 1A, a mixing tank 4 to which an inorganic flocculant and a pH adjuster are added, a flocculant tank 15 to which a polymer flocculant is added, and a precipitation tank 30 for precipitating flocs are integrally formed. The processing tank 2 constituting the mixing tank 4 and the agglomeration tank 15 is formed in a cylindrical shape or a substantially cylindrical shape, and the peripheral wall portion 3 is provided with a defect portion 3a having no peripheral wall surface. On the other hand, the settling tank 30 is formed in a normal cylindrical shape.

  The defective portion 3 a formed in the treatment tank 2 is abutted against the peripheral wall portion 31 of the sedimentation tank 30, and the abutted defective portion 3 a is joined to the peripheral wall portion 31 of the sedimentation tank 30 and integrally formed. For this reason, in the defect | deletion part 3a, the shared parts 7 and 16 which share the surrounding wall surface 3 of the processing tank 2 and the surrounding wall surface 31 of the sedimentation tank 30 are formed.

  This solid-liquid separation apparatus 1A introduces the water to be treated into the mixing tank 4 and adds an inorganic flocculant to facilitate the coagulation of the water to be treated, and also adds a pH adjuster to make the water to be treated neutral. To do. Next, the water to be treated is introduced into the coagulation tank 15, and the water to be treated is subjected to a polymer coagulation treatment to form a flock. Thereafter, the agglomerated water that has been agglomerated is allowed to enter the settling tank 30. In the sedimentation tank 30, the pollutant contained in the flocculated water is precipitated to remove the pollutant. And the treated water from which the pollutant substance was removed is sent out of the solid-liquid separator 1A.

<Mixing tank and coagulation tank>
The mixing tank 4 and the agglomeration tank 15 are configured as a cylindrical or substantially cylindrical processing tank 2 formed integrally. A partition plate 5 is provided inside the processing tank 2, and the partition plate 5 divides the inside of the processing tank 2 into a mixing tank 4 and a coagulation tank 15. The partition plate 5 is provided so as to communicate between the shared portions 7 and 16 and portions facing the shared portions 7 and 16 of the peripheral wall portion 3 constituting the processing tank 2. An opening 6 is formed in the partition plate 5 so that the water to be treated can be moved from the mixing tank 4 to the aggregation tank 15.

  The mixing tank 4 is configured such that the periphery is surrounded by the peripheral wall portion 3 of the treatment tank 2, the shared portion 7 sharing the peripheral wall portion 3 of the mixing tank 4 and the peripheral wall portion 31 of the sedimentation tank 30, and the partition plate 5. An introduction port 8 is provided in the peripheral wall 3 of the mixing tank 4, and the water to be treated is introduced into the mixing tank 4. A stirring device 10 for stirring the treated water introduced is provided at the bottom 9 of the mixing tank 4.

  The stirring device 10 includes a stirring blade 12 provided inside the mixing tank 4 and a drive motor 11 that is attached to the outside of the bottom 9 of the mixing tank 4 and rotationally drives the stirring blade 12. The rotation direction of the stirring blade 12 of the stirring device 20 is set to either clockwise or counterclockwise as necessary.

  In the mixing tank 4, an inorganic flocculant is added to the water to be treated to facilitate aggregation of the pollutant contained in the water to be treated. The inorganic flocculant to be added is not particularly limited, and examples thereof include an aluminum salt such as a sulfuric acid band and polyaluminum chloride, and an iron salt such as ferric chloride and ferrous sulfate.

Moreover, a to-be-processed water is made neutral by adding a pH adjuster. The pH adjuster to be added is not particularly limited, and examples of the insoluble salt generator for generating an insoluble salt from metal ions include alkaline agents such as sodium hydroxide, potassium hydroxide, and calcium hydroxide. . Examples of the phosphate salt insoluble salt generator include calcium salts such as calcium chloride, calcium hydroxide, and the like. Examples of the fluoride ion insoluble salt generator include calcium salts such as calcium chloride, calcium hydroxide, and the like.

  The agglomeration tank 15 is configured such that the periphery is surrounded by the peripheral wall 3 of the treatment tank 2, the shared wall 16 sharing the peripheral wall 3 of the aggregation tank 15 and the peripheral wall 31 of the sedimentation tank 30, and the partition plate 5. In addition, the common port 16 is formed with a communication port 17 that allows the aggregation tank 15 and the sedimentation tank 30 to communicate with each other. Further, the coagulation tank 15 is provided with a first vertical baffle 35 extending from the shared portion 16 toward the inside of the coagulation tank 15 at the side of the communication port 17. Details of the communication port 17 and the first vertical baffle 35 will be described later.

  A stirring device 20 for stirring the water to be treated inside is also provided at the bottom 18 of the coagulation tank 15. The agitation device 20 includes an agitation blade 22 provided inside the agglomeration tank 15 and a drive motor 21 that is attached to the outside of the bottom 18 of the agglomeration tank 15 and rotates the agitation blade 22. The rotation direction of the stirring blade 22 of the stirring device 20 is set to either clockwise or counterclockwise as necessary. In the first embodiment, the first vertical baffle 35 is driven to rotate counterclockwise, which is a direction in which the coagulated water is easily guided to the communication port 17.

  In the coagulation tank 15, a polymer coagulant is added to the internal coagulation water. The polymer flocculant is not particularly limited, and examples thereof include an anionic polymer flocculant, a cationic polymer flocculant, an amphoteric polymer flocculant, and a nonionic polymer flocculant.

<Settling tank>
The settling tank 30 is a swirling flow type settling tank 30 that swirls condensed water that has entered the inside of the settling tank 30. The sedimentation tank 30 is formed in a cylindrical shape, and shared parts 7 and 16 that share the peripheral wall part 3 of the processing tank 2 are provided on the peripheral wall part 31 thereof. Of the shared parts 7 and 16, a communication port 17 that connects the aggregation tank 15 and the precipitation tank 30 is formed in the shared part 16 of the peripheral wall part 3 of the aggregation tank 15 and the peripheral wall part 31 of the precipitation tank 30. . Further, a second vertical baffle 36 extending from the shared part 16 toward the inside of the precipitation tank 30 is provided in the side part of the communication port 17 inside the precipitation tank 30. Details of the communication port 17 and the second vertical baffle 36 will be described later. Aggregated treated water enters the treated water from the communication port 17, and the approach direction is guided in a predetermined direction by the second vertical baffle 36. The agglomerated water that has entered the settling tank 30 rotates in the circumferential direction inside the settling tank 30 by the driving force of the agglomerated water itself.

  On the other hand, a water intake trough 38 is provided in the upper part of the settling tank 30. The intake trough 38 is a groove whose outer shape is formed in a ring shape and whose upper surface is open. The intake trough 38 is configured such that the supernatant liquid after the pollutant in the flocculated water is precipitated flows into the groove from the opened upper surface. A drain pipe 39 extending toward the outside of the settling tank 30 is connected to the intake trough 38, and the treated water from which the polluted substances have been removed is sent out to the outside.

<Communication port, first vertical baffle and second vertical baffle>
The communication port 17 is formed in the shared portion 16 where the peripheral wall portion 3 of the coagulation tank 15 and the peripheral wall portion 31 of the precipitation tank 30 are shared, and allows the coagulation tank 15 and the precipitation tank 30 to communicate with each other. The communication port 17 is formed in a rectangular shape such as a square or a vertically long rectangle. As shown in FIG. 3, the dimension H in the height direction of the communication port 17 is preferably 50% to 100% of the height dimension H2 of the first vertical baffle 35 and the second vertical baffle 36. Further, the area of the communication port 17 is formed so that the coagulation treated water enters the settling tank 30 from the coagulation tank 15 at an appropriate flow rate according to the flow rate of the coagulation treated water passing through the communication port 17. The area of the communication port 17 is preferably formed so that the flow rate of the flocculated water is 0.01 m / second to 1 m / second.

  As shown in FIG. 4, a plate-like first vertical baffle 35 extending from the shared portion 16 toward the inside of the aggregation tank 15 is provided on one side portion 17 a of the communication port 17. In addition, a plate-like second vertical baffle 36 extending from the shared portion 16 toward the inside of the settling tank 30 is provided on the other side portion 17b facing the side portion 17a. The first vertical baffle 35 and the second vertical baffle 36 are arranged in parallel with the communication port 17 interposed therebetween. The first vertical baffle 35 guides the coagulated water located inside the coagulation tank 15 toward the communication port 17. The second vertical baffle 36 guides the coagulated water from the communication port 17 to the inside of the settling tank 30. These baffles 35 and 36 have a flat plate shape and extend in the vertical direction.

  The agglomerated water that has been guided to the first vertical baffle 35 and the second vertical baffle 36 and entered the settling tank 30 is swung in the circumferential direction of the settling tank 30 by the driving force. In order for the flocculated water to appropriately swirl inside the sedimentation tank 30, the direction of entering the sedimentation tank 30 is important. Therefore, in this solid-liquid separator 1A, the first vertical baffle 35 and the second vertical baffle 36 are oblique to the tangent T at the position of the communication port 17 on the circle corresponding to the peripheral wall portion 31 of the settling tank 30. It is tilted and arranged. The angle θ formed between the tangent lines of the first vertical baffle 35 and the second vertical baffle 36 is preferably 10 ° or more, particularly 15 ° or more, particularly 30 ° or more, and 60 ° or less, particularly 45 ° or less. Therefore, the baffle 35 and the radial crossing angle α are 80 ° or less, particularly 60 ° or less, and preferably 30 ° or more.

  The first vertical baffle 35 has a length dimension M between a root portion which is a connection portion with the shared portion 16 and a tip portion extending toward the inside of the aggregation tank 15 and a height between the upper end and the lower end. All the dimensions N are formed to be 1 / 100th of the diameter of the sedimentation tank 30. Similarly, the second vertical baffle 36 has a length dimension M between a root portion which is a connection portion with the shared portion 16 and a tip portion extending toward the inside of the settling tank 30, and an upper end and a lower end. The height dimension N between them is formed to be one hundredth to one tenth of the diameter of the sedimentation tank 30.

<Action and effect>
The solid-liquid separation device 1A described above operates as follows.

  First, water to be treated is introduced into the mixing tank 4 from the inlet 8 provided in the mixing tank 4. When the water to be treated is introduced into the mixing tank 4, an inorganic flocculant is added, and the pollutant contained in the water to be treated is easily aggregated. Moreover, a to-be-processed water is made neutral by adding a pH adjuster. At this time, the stirring device 10 provided in the mixing tank 4 stirs the water to be treated to which the inorganic flocculant and the pH adjuster have been added, and causes the inorganic flocculant and the pH adjuster to act uniformly within the mixing tank 4. .

  Since the water to be treated is sequentially introduced into the mixing tank 4 from the introduction port 8, a propulsive force is applied to the water to be treated located inside the mixing tank 4, and an opening formed in the partition plate 5. 6 are sequentially pushed into the agglomeration tank 15 and moved.

  Next, the polymer flocculant is added to the water to be treated that has moved to the aggregation tank 15 in the aggregation tank 15. Since the aggregating tank 15 is also provided with the stirring device 20, the water to be treated to which the polymer flocculant is added is stirred and the polymer flocculant acts evenly. A floc in which the pollutant is agglomerated is formed in the agglomerated water that has been agglomerated by the polymer flocculant. The agglomerated water after the agglomeration treatment is guided to the communication port 17 by the first vertical baffle 35 so as to be pushed out by the driving force. Thereafter, the flocculated water enters the sedimentation tank 30 from the communication port 17 while being guided to the second vertical baffle 36.

At this time, since the flocculated water only passes through the communication port 17 formed in the common part 16, no unnecessary load or impact is applied to the flocculated water. Therefore, the floc formed in the aggregation tank 15 is moved to the precipitation tank 30 without being decomposed. Further, since the first vertical baffle 35 and the second vertical baffle 36 are arranged in parallel, the agglomeration treated water is guided in an appropriate direction by the coagulation tank vertical baffle 35 and the second vertical baffle 36. As a result, it enters the settling tank 30. As a result, the coagulated water that has entered the settling tank 30 smoothly forms a swirling flow inside the settling tank 30. Further, by arranging the first vertical baffle 35 and the second vertical baffle 36 in parallel, it is possible to prevent the flock from colliding with the first vertical baffle 35 and the second vertical baffle 36.

  When the dimension H in the height direction of the communication port 17 is formed to be 50% to 100% of the height dimension H2 of the first vertical baffle 35 and the second vertical baffle 36, as shown in FIG. 35 can guide the agglomerated water to all regions in the height direction of the communication port 17, and the second vertical baffle 36 has a rapid advancing direction of the agglomerated water just after entering the agglomeration tank from the communication port 17. Can be prevented.

  Further, as shown in FIG. 4, if the first vertical baffle 35 and the second vertical baffle 36 are disposed at an angle of 10 degrees to 60 degrees with respect to the tangent line T of the shared portion 16 at the position of the communication port 17, The agglomerated water can enter the sedimentation tank 30 in a suitable direction in which the agglomerated water efficiently turns inside the sedimentation tank 30.

  Furthermore, if the length dimension M and the height dimension N of the first vertical baffle 35 and the settling tank tsushin straight baffle are formed to be 1 / 100th of the diameter of the settling tank 30, the flocculated water Can be reliably passed from the flocculation tank 15 through the communication port 17 and guided to the precipitation tank 30, and the progress of the flocculated water can be prevented from being inhibited. Further, it is possible to prevent the formed flock from colliding with the first vertical baffle 35 and the second vertical baffle 36.

  In the sedimentation tank 30, floc having a specific gravity larger than that of the agglomerated water is precipitated at the bottom of the sedimentation tank 30 while the agglomerated water swirls in the circumferential direction inside the sedimentation tank 30. Therefore, the treated water from which the pollutant is removed occupies the upper part in the settling tank 30.

  The treated water from which the pollutants have been removed flows into a water intake trough 38 provided in the upper part of the settling tank 30, and then is sent out through a drain pipe 39 connected to the water intake trough 38.

[Second Embodiment (FIG. 5)]
The solid-liquid separation apparatus 1B according to the second embodiment removes contaminants from the water to be treated using an apparatus configured similarly to the solid-liquid separation apparatus 1A according to the first embodiment. The difference from the first embodiment is the action of the stirring device 20 provided in the aggregation tank 15. Therefore, FIG. 5 referred to for explaining the solid-liquid separation device 1B is given the same reference numeral as that of the solid-liquid separation device 1A according to the first embodiment, and only the outline is described. Omitted.

  The solid-liquid separation device 1B is configured by integrally forming a mixing tank 4, a coagulation tank 15, and a precipitation tank 30. The processing tank 2 constituting the mixing tank 4 and the agglomeration tank 15 is formed in a cylindrical shape or a substantially cylindrical shape, and the peripheral wall portion 3 is provided with a defect portion 3a having no peripheral wall surface. On the other hand, the settling tank 30 is formed in a normal cylindrical shape.

  The defect part 3 a of the treatment tank 2 is abutted against the peripheral wall part 31 of the sedimentation tank 30, and the defect part 3 a is joined to the peripheral wall part 31 of the precipitation tank 30 and formed integrally. In the defect portion 3 a, shared portions 7 and 16 that share the peripheral wall surface 3 of the treatment tank 2 and the peripheral wall surface 31 of the sedimentation tank 30 are formed.

  The mixing tank 4 and the agglomeration tank 15 are configured as a cylindrical or substantially cylindrical processing tank 2 formed integrally. The treatment tank 2 is provided with a partition plate 5 therein, and the partition plate 5 divides the inside of the treatment tank 2 into a mixing tank 4 and a coagulation tank 15. The partition plate 5 is provided so as to communicate between the shared portions 7 and 16 and a portion facing the shared portion 16 of the peripheral wall portion constituting the processing tank 2. An opening 6 is formed in the partition plate 5 so that the water to be treated can be moved from the mixing tank 4 to the aggregation tank 15.

  In addition, a communication port 17 that connects the aggregation tank 15 and the sedimentation tank 30 is formed in the common part 16 that forms the peripheral wall portions 3 and 31 of both the aggregation tank 15 and the sedimentation tank 30. A plate-like first vertical baffle 35 extending from the shared portion 16 toward the inside of the aggregation tank 15 is provided on one side portion 17 a of the communication port 17. In addition, a plate-like second vertical baffle 36 extending from the shared portion 16 toward the inside of the settling tank 30 is provided on the other side portion 17b facing the side portion 17a. The first vertical baffle 35 and the second vertical baffle 36 are arranged in parallel with the communication port 17 interposed therebetween. The first vertical baffle 35 guides the coagulated treated water located inside the coagulation tank 15 toward the communication port 17, while the second vertical baffle 36 guides the coagulated treated water from the communication port 17 to the inside of the precipitation tank 30. ing.

  The sedimentation tank 30 is a swirl flow type sedimentation tank 30 that precipitates flocs while swirling coagulated water that has entered the interior in the circumferential direction. A ring-shaped water intake trough 38 is provided at the top of the settling tank 30. A drainage pipe 39 extending toward the outside of the settling tank 30 is connected to the water intake trough 38, and the treated water from which the polluted substances have been removed is sent out to the outside.

  This solid-liquid separation apparatus 1A introduces the water to be treated into the mixing tank 4 and adds an inorganic flocculant to facilitate the coagulation of the water to be treated, and also adds a pH adjuster to make the water to be treated neutral. To do. Next, the water to be treated is introduced into the coagulation tank 15, and the water to be treated is subjected to a polymer coagulation treatment to form a flock. Thereafter, the agglomerated water that has been agglomerated is allowed to enter the settling tank 30. In the sedimentation tank 30, the pollutant contained in the flocculated water is precipitated to remove the pollutant. And the treated water from which the pollutant substance was removed is sent out of the solid-liquid separator 1A.

<Agitator>
A feature of this solid-liquid separation device 1A is that the stirring device 20 provided in the coagulation tank 15 gives a swirl force to the coagulated water in the direction opposite to the direction in which the first vertical baffle 35 guides the coagulated water to the communication port 17. Thus, the agglomerated water is stirred.

In the state shown in FIG. 5, the agglomerated water in the agglomeration tank 15 is guided from the right side inside the agglomeration tank 15 to the communication port 17 by the first vertical baffle 35. On the other hand, the rotary blade provided in the stirring device 20 is rotated in the clockwise direction, which is the direction opposite to the direction in which the first vertical baffle 35 guides the coagulated water. In this way, by rotating the rotating blades of the stirring device 20, the flow rate of the coagulated treated water passing through the communication port 17 can be made uniform. Therefore, it is possible to stabilize the flow of the agglomerated treated water that has entered the sedimentation tank 30 from the communication port 17 and form a suitable swirl flow inside the sedimentation tank 30.

  It is preferable to rotate the rotary blade 22 of the stirring device 20 so that the tip speed is 1 m / second to 5 m / second.

[Third Embodiment (FIGS. 6 and 7)]
The basic configuration of the solid-liquid separator 1C according to the third embodiment shown in FIGS. 6 and 7 is the same as that of the solid-liquid separator 1A according to the first embodiment and the solid-liquid separator 1B according to the second embodiment. It is. Therefore, in FIGS. 6 and 7, the same reference numerals as those of the solid-liquid separators 1A and 1B according to the first embodiment and the second embodiment are attached, and only the outline is described. Detailed description is omitted here. .

  In this solid-liquid separator 1C, the mixing tank 4, the coagulation tank 15, and the precipitation tank 30 are integrally formed. The processing tank 2 constituting the mixing tank 4 and the agglomeration tank 15 is formed in a cylindrical shape or a substantially cylindrical shape, and the peripheral wall portion 3 is provided with a defect portion 3a having no peripheral wall surface. On the other hand, the settling tank 30 is formed in a normal cylindrical shape.

  The defect part 3 a of the treatment tank 2 is abutted against the peripheral wall part 31 of the precipitation tank 30, and the defect part 3 a is joined to the peripheral wall part 31 of the precipitation tank 30 and formed integrally. In the defect part 3 a, shared parts 7 and 16 that share the peripheral wall part 3 of the treatment tank 2 and the peripheral wall part 31 of the sedimentation tank 30 are formed.

  The mixing tank 4 and the agglomeration tank 15 are configured as a cylindrical or substantially cylindrical processing tank 2 formed integrally. The treatment tank 2 is provided with a partition plate 5 therein, and the partition plate 5 divides the inside of the treatment tank 2 into a mixing tank 4 and a coagulation tank 15. The partition plate 5 is provided so as to communicate between the shared portions 7 and 16 and portions facing the shared portions 7 and 16 of the peripheral wall portion 3 of the processing tank 2. An opening 6 is formed in the partition plate 5 so that the water to be treated can be moved from the mixing tank 4 to the aggregation tank 15.

  A communication port 17 that communicates the flocculation tank 15 and the settling tank 30 is formed in the shared portion 16 that forms the peripheral wall portions 3 and 31 of both the flocculation tank 15 and the settling tank 30. A plate-like first vertical baffle 35 extending from the shared portion 16 toward the inside of the aggregation tank 15 is provided on one side portion 17 a of the communication port 17. In addition, a plate-like second vertical baffle 36 extending from the shared portion 16 toward the inside of the settling tank 30 is provided on the other side portion 17b facing the side portion 17a. The first vertical baffle 35 and the second vertical baffle 36 are arranged in parallel with the communication port 17 interposed therebetween. The first vertical baffle 35 guides the coagulated treated water located inside the coagulation tank 15 toward the communication port 17, while the second vertical baffle 36 guides the coagulated treated water from the communication port 17 to the inside of the precipitation tank 30. ing.

  The sedimentation tank 30 is a swirl flow type sedimentation tank 30 that precipitates flocs while swirling coagulated water that has entered the interior in the circumferential direction. A ring-shaped water intake trough 38 is provided at the top of the settling tank 30. A drainage pipe 39 extending toward the outside of the settling tank 30 is connected to the water intake trough 38, and the treated water from which the polluted substances have been removed is sent out to the outside.

  In this solid-liquid separator 1C, the water to be treated is introduced into the mixing tank 4 and an inorganic flocculant is added to facilitate the aggregation of the water to be treated. Moreover, a to-be-processed water is made neutral by adding a pH adjuster. Next, the water to be treated is introduced into the coagulation tank 15, and the water to be treated is subjected to a polymer coagulation treatment to form a flock. Thereafter, the agglomerated water that has been agglomerated is allowed to enter the settling tank 30. In the sedimentation tank 30, the pollutant contained in the flocculated water is precipitated to remove the pollutant. And the treated water from which the pollutant was removed is sent out of the solid-liquid separator 1C.

<Turning assist device>
A feature of the solid-liquid separation device 1A according to the third embodiment is that the turning auxiliary device 40 that assists the turning of the coagulated water that has entered the settling tank 30 is located below the lower end of the second vertical baffle 36. It is in the point arranged at the position.

  The turning assist device 40 includes a rotation drive unit 41 attached to the center of the bottom surface 18 of the settling tank 30, a rotation shaft 42 extending upward from the rotation drive unit 41, and rotated by the rotation drive unit 41. A plurality of rotating arms 43 extending radially from the shaft 42 toward the peripheral wall portion 31 of the settling tank 30 are configured. The rotation drive unit 41 rotates the rotation shaft 42 in the same direction as the direction in which the coagulated water is swung by the propulsive force of the coagulated water itself. All the rotating arms 43 are positioned below the lower end of the second vertical baffle 36.

The shape of the rotating arm 43 is not particularly limited, and a round bar, a square bar, or a plate material can be used, but the number is preferably 4 to 8. It is preferable that the length of each rotating arm 43 is formed to be 60% or more and less than 100% of the radius of the settling tank 30. On the other hand, the vertical cross-sectional area of the rotary arm 43 is preferably configured to be 0.002% to 0.2% with respect to the vertical cross-sectional area of the settling tank 30. Specifically, it is preferable vertical area is formed in ^{5cm 2 ~500cm} 2.

  The turning assist device 40 assists the turning of the coagulated water by rotating the rotation arm 43 in the same direction as the direction in which the coagulated water is turned by the propulsive force of the coagulated water itself that has entered the settling tank 30. In order for the agglomerated water to appropriately rotate inside the sedimentation tank 30, it is preferable that the tip of the rotary arm 43 is rotationally driven so as to move at a speed of 1 m / second to 5 m / second.

  In order to collect mud collected in the bottom of the sedimentation tank 30, a mud collecting rake is generally used. However, the rotary arm 43 of the swivel assist device 40 can also function as a rake arm for the mud collecting rake. .

[Fourth Embodiment (FIG. 8)]
This solid-liquid separation device 1D includes a mixing tank 50 to which an inorganic flocculant and a pH adjuster are added, a flocculant tank 60 to which a polymer flocculant is added, and a precipitation tank 80 for precipitating pollutants. Yes. The mixing tank 50 is provided independently of the aggregation layer and precipitation tank 80, and is connected to the aggregation tank 60 by a transfer pipe 58. On the other hand, the aggregation tank 60 and the sedimentation tank 80 are integrally configured.

<Mixing tank>
The mixing tank 50 has a cylindrical outer shape. The peripheral wall 52 of the mixing tank 50 is provided with an introduction port 51 for introducing the water to be treated therein and a transfer pipe 58 for transferring the water to be treated to the coagulation tank 60. In addition, the mixing tank 50 is provided with a stirring device 55 for stirring the water to be treated.

<Coagulation tank and sedimentation tank>
The agglomeration tank 60 is formed in a cylindrical shape or a substantially cylindrical shape. A part of the peripheral wall portion 61 is provided with a defect portion 61a where a peripheral wall surface is desired to exist. On the other hand, the outer shape of the sedimentation tank 80 is formed in a cylindrical shape. In the agglomeration tank 60, the defect 61 a is abutted against the peripheral wall 81 of the sedimentation tank 80, and the associated defect 61 a is joined to the peripheral wall 81 of the sedimentation tank 80 to be integrated with the sedimentation tank 80. Yes. In the defect portion 61 a, a shared portion 62 is formed in which the peripheral wall portion 61 of the aggregation tank 60 and the peripheral wall portion 81 of the sedimentation tank 80 are shared.

  A transfer pipe 58 is connected to the peripheral wall portion 61 of the aggregation tank 60, and water to be treated is fed from the mixing tank 50 through the transfer pipe 58. Further, the agglomeration tank 60 is provided with a stirring device 65 to stir the water to be treated. The common part 62 is formed with a communication port 63 that allows the aggregation tank 60 and the sedimentation tank 80 to communicate with each other. The communication port 63 allows the agglomerated water that has been agglomerated in the agglomeration tank 60 to enter the settling tank 80 from the agglomeration tank 60. Further, the coagulation tank 60 is provided with a first vertical baffle 70 extending from the shared portion 62 toward the inside of the coagulation tank 60 at the side of the communication port 63.

  The sedimentation tank 80 is a swirl type sedimentation tank 80 that precipitates pollutants while swirling the coagulated water that has entered the interior. The sedimentation tank 80 is formed in a cylindrical shape, and a shared part 62 sharing the peripheral wall part 61 of the aggregation tank 60 is provided on the peripheral wall part 81 thereof. The shared portion 62 is formed with a communication port 63 that allows the aggregation tank 60 and the sedimentation tank 80 to communicate with each other. Further, a second vertical baffle 71 extending from the shared portion 62 toward the inside of the sedimentation tank 80 is provided inside the sedimentation tank 80 at the side of the communication port 63. The agglomerated water enters the inside of the sedimentation tank 80 from the communication port 63, and the entrance direction thereof is guided in a predetermined direction by the sedimentation tank 80 vertical baffle. The agglomerated water that has entered the settling tank 80 rotates in the circumferential direction inside the settling tank 80 by the propulsive force of the agglomerated water itself.

  On the other hand, a ring-shaped water intake trough 83 is provided in the upper part of the settling tank 80. The intake trough 83 is configured such that the supernatant liquid after the pollutant in the flocculated water is precipitated flows from the opened upper surface. A drain pipe 84 extending toward the outside of the sedimentation tank 80 is connected to the intake trough 83, and the treated water from which the polluted substances have been removed is sent out to the outside.

<Communication port, first vertical baffle and second vertical baffle>
The communication port 63 is formed in a shared portion 62 where the peripheral wall portion of the coagulation tank 60 and the peripheral wall portion of the sedimentation tank 80 are shared, and allows the aggregation tank 60 and the sedimentation tank 80 to communicate with each other. The communication port 63 is formed in a rectangular shape such as a square or a vertically long rectangle.

  The first vertical baffle 70 is formed in a plate shape and is provided on one side of the communication port 63 so as to extend from the shared portion 62 toward the inside of the aggregation tank 60. Moreover, the 2nd vertical baffle 71 is also formed in plate shape, and it is provided so that it may extend toward the inside of the sedimentation tank 80 from the shared part 62 in the other side part. The first vertical baffle 70 and the second vertical baffle 71 are arranged in parallel with the communication port 63 interposed therebetween. The first vertical baffle 70 guides the coagulated treated water located inside the coagulation tank 60 toward the communication port 63, while the second vertical baffle 71 guides the coagulated treated water from the communication port 63 to the inside of the precipitation tank 80. ing.

  The details of the configuration of the communication port 63, the first vertical baffle 71, and the second vertical baffle 71 are the communication port 17, the first vertical baffle of the solid-liquid separators 1A, 1B, and 1C of the first to third embodiments. 35 and the second vertical baffle 36.

  Even if the solid-liquid separation device 1D is configured with the mixing tank 50 independent as in the fourth embodiment, a shared portion 62 that shares the peripheral wall portions 61 and 81 of both the aggregation tank 60 and the sedimentation tank 80 is provided. Since the communication port 63 is formed in the common part 62, the floc formed in the coagulation tank 60 is not decomposed when the coagulation treatment water moves from the coagulation tank 60 to the settling tank 80.

[Fifth Embodiment]
11A and 11B are configuration diagrams of a solid-liquid separator 90A according to the fifth embodiment, in which FIG. 11A is a plan view, FIG. 11B is a longitudinal sectional view, and FIG. 11C is a perspective view near the first vertical baffle. (D) is a perspective view of the vicinity of the second vertical baffle.

  In this solid-liquid separator 90A, the water to be treated (raw water) flows into the mixing tank 92 after the inorganic flocculant is added in the raw water pipe 91, and the pH adjuster is added from the pH adjuster adding means 92b. It stirs with the stirring apparatus 92a. As the inorganic flocculant and pH adjuster, those described above can be used. A pH adjuster is added so that the pH detected by the pH meter 92c falls within a predetermined range.

  The liquid in the mixing tank 92 is added with a polymer flocculant (for example, an anionic polymer flocculant) in the transfer pipe 93 and is preferably transferred to the lower part of the flocculent tank 94.

  The agglomeration tank 94 is provided with a stirring device 94a, and the liquid is slowly stirred to grow a floc.

  A first vertical baffle 95 is provided on the side wall surface of the aggregation tank 94. The first vertical baffle 95 has a substantially U-shaped horizontal cross section, and bridges a pair of side plates 95a and 95a connected to the side wall surface of the aggregation tank 94 and the side plates 95a and 95a. And a front plate 95b. In this embodiment, a bottom plate 95 c is provided on the bottom surface portion of the first vertical baffle 95, and the bottom plate 95 c has a substantially square cylindrical shape with an open top and a bottom between the first vertical baffle 95 and the side wall surface of the aggregation tank 94. A space is formed. The liquid in the coagulation tank 94 flows over the upper end of the first vertical baffle 95 and flows into the space, and then passes through the liquid passage 96 (transfer pipe) that opens to the side wall surface at the lower part of the space. The sludge is settled and separated. The treated water (supernatant water) is taken out from the treated water take-out trough 97 a provided in the upper part of the settling tank 97, and the precipitated sludge is taken out from the bottom of the settling tank 97.

  The liquid passage 96 is open to the side wall surface of the settling tank 97. A second vertical baffle 98 is provided so as to face the opening of the liquid passage 96. The second vertical baffle 98 is connected to the side wall surface and has a front plate 98a whose plate surface is in the vertical direction, a bottom plate 98b provided between the lower end of the front plate 98a and the side wall surface, and a front plate 98a. The ceiling board 98c provided between the upper end and the side wall surface. The front plate 98 a extends in a direction oblique to the radial direction of the settling tank 97.

  The crossing angle between the front plate 98a and the radial direction of the settling tank 97 is preferably 30 ° to 60 °, particularly preferably 40 ° to 50 °.

  The bottom plate 98b and the ceiling plate 98c are substantially triangular. An open portion 98d is provided between the side edge of the front plate 98a opposite to the side wall surface and the side wall surface. The liquid from the liquid flow path 96 flows out in the tangential direction along the side wall surface into the settling tank 97 from the open portion 98d, and turns gently, during which precipitation is performed.

  In this embodiment, the mixing tank 92, the agglomeration tank 94, and the settling tank 97 are all cylindrical, and are appropriately spaced from each other.

  When the radius of the coagulation tank 94 is r, the radius of the precipitation tank 97 is R, and the horizontal width of the liquid passage 96 between the two is d, the center distance L between the coagulation tank 94 and the precipitation tank 97 is Meet.

Lmin ≦ L ≦ Lmax
However, Lmin = (R + r) × 0.8. Lmax is the larger of (R + r) × 1.2 and (R + r + d).

  In the solid-liquid separation apparatus configured as described above, the coagulation tank 94 and the settling tank 97 are close to each other, and the floc is prevented from being damaged while being transferred from the coagulation tank 94 to the settling tank 97. . Further, in this embodiment, the second vertical baffle 98 having the front plate 98 a obliquely intersecting with the radial direction of the settling tank 97 is provided in the settling tank 97, and the aggregating treatment liquid is in a substantially tangential direction in the settling tank 97. Flow smoothly, preventing damage to the floc.

  Further, the agglomerated water from the liquid passage 96 is prevented from flowing into the trough 97a in a short circuit, and the precipitation separation is sufficiently performed.

[Sixth Embodiment]
In the fifth embodiment of FIG. 11, the upper end of the first vertical baffle 95 extends to the vicinity of the water surface in the coagulation tank 94, but the solid-liquid separation device 90B of the sixth embodiment of FIG. Then, the first vertical baffle 95 </ b> B is in the vicinity of the middle of the water depth of the aggregation tank 94.

  The other structure of 6th Embodiment is the same as 5th Embodiment, and the same code | symbol has shown the identical part.

  As in the sixth embodiment, by setting the upper end of the first baffle 95B of the coagulation tank 94 near the middle of the water depth of the coagulation tank 94, the coagulation pellets are destroyed by entraining air from the water surface of the coagulation tank 94. Can be prevented well, and the outflow rate of SS can be kept low. The distance from the upper end of the baffle to the water surface is 20% to 70% of the water depth of the coagulation tank, or 200 mm to 2000 mm, more preferably 500 mm to 1000 mm.

[Seventh Embodiment]
A solid-liquid separation device 90C of the seventh embodiment shown in FIG. 13 is such that the center-to-center distance L between the aggregation tank 94 and the sedimentation tank 97 is smaller than that of the sixth embodiment. Other configurations are the same as those of the sixth embodiment, and the same reference numerals indicate the same parts.

  Thus, by installing the coagulation tank 94 and the swirling flow type precipitation tank 97 closer to each other, it is possible to prevent the flocs from collapsing and to reduce the SS outflow rate.

[Eighth Embodiment]
In the solid-liquid separator 90D of the eighth embodiment shown in FIG. 14, the configuration of the first vertical baffle 95D of the coagulation tank 94 is different from the first vertical baffles 95, 95B of the fifth to seventh embodiments.

  The first vertical baffle 95D is composed of a front plate 95h and a bottom plate 95k that are continuous with the side wall surface of the aggregation tank 95. The front plate 95h has a flat plate shape, and one side 95 'is connected to the side circumferential wall surface of the aggregation tank 95, and the other side 95' is separated from the side circumferential wall surface. The front plate 95h crosses at an intersecting angle α = 30 to 60 ° (preferably 40 to 50 °) with respect to the radial direction of the aggregation tank 95.

  The direction from one side 95 'of the front plate 95h to the other side 95 "is the direction of swirling of the liquid in the coagulation tank 94 formed by the stirring device 94a. The opening of the liquid passage 96 is located on the one side 95 'side. Therefore, the water swirling in the coagulation tank 94 flows around the side 95 </ b> ″ of the front plate 95 h, flows in the direction opposite to the swirling direction, and flows into the liquid passage 96.

  The front plate 95h is preferably substantially parallel to the front plate 98a of the second vertical baffle 98 (α is substantially equal). Note that “substantially equal” means that the difference in angle α between both front plates is within ± 5 °, particularly within ± 3 °.

  By making the front plates 95h and 98a of the vertical baffle substantially parallel to each other, it is possible to prevent the flocs from collapsing and to suppress the SS outflow. At this time, the distance between the tank wall of the aggregation tank 94 and the tank wall of the settling tank 97 is preferably as small as possible, and the distance is equal to or less than the width d of the opening of the liquid passage 96.

  The upper end of the first vertical baffle 95 </ b> D is near the middle in the vertical direction of the aggregation tank 94.

  The other structure of 8th Embodiment is the same as 7th Embodiment, and the same code | symbol has shown the identical part.

[Ninth Embodiment]
A solid-liquid separation device 90E according to the ninth embodiment shown in FIG. 15 is obtained by providing a swivel assist device 99 in the settling tank 97 in the solid-liquid separation device 90D of the eighth embodiment. The swivel assist device 99 is extended in a radial direction from a rotary shaft 99a arranged in the vertical direction at the axial center of the settling tank 97, a motor 97b for rotating the rotary shaft 99a, and a lower end of the rotary shaft 99a. And an arm 99c as a turning portion. A plurality of arms 99c are provided at intervals in the circumferential direction. The arm 95c is disposed below the second vertical baffle 98.

  The other structure of 9th Embodiment is the same as that of 8th Embodiment, and the same code | symbol has shown the identical part.

In this embodiment, an arm 99c whose rotation direction is the same as the inflow direction of the coagulation tank treated water is provided below the liquid passage 96, and the inflow is performed by gently rotating the water in the entire precipitation tank. Assisting the rotational force of water, it is possible to achieve better swirl type sedimentation tank treatment performance. The number of arms is preferably 4 to 8, and the length is preferably 60% to 99% of the settling tank radius. The cross-sectional shape of the arm can be round or square. The cross-sectional area is preferably 5 cm ² to 500 cm ² or 0.002% to 0.2% of the area of the precipitation tank. The height of the arm 99c is between the bottom of the settling tank and the vertical baffle 98. The tip speed of the arm 99c is preferably 0.02 m / sec to 5 m / sec.

[Tenth embodiment]
In the solid-liquid separation device 90F of the tenth embodiment shown in FIG. 16, a rake plate 99d is provided on the lower side of the arm 99c in the ninth embodiment. The sludge collected by the rake plate 99d is guided to the pit 97p at the bottom of the settling tank 97 and discharged.

[Eleventh embodiment]
A solid-liquid separator 90G of the eleventh embodiment shown in FIG. 17 is configured such that the first vertical baffle 95G rises to near the water surface in the eighth embodiment of FIG.

  Other configurations are the same as those of the eighth embodiment shown in FIG. 14, and the same reference numerals denote the same parts.

  In the solid-liquid separators 90A to 90G, the G value of the aggregation tank 94 is preferably 10 (1 / s) to 100 (1 / s). The tip speed of the stirring blade of the coagulation tank 94 is preferably 0.05 m / sec to 2 m / sec. As for the magnitude | size of each 1st and 2nd vertical baffle, 1/100-1/10 of the diameter of the sedimentation tank 97 are preferable in both width and height. The shape of the opening of the liquid passage 96 in the side peripheral walls of the aggregation tank 94 and the precipitation tank 97 is preferably square. The height of the opening of the liquid passage 96 is preferably 50% to 100% of the height of each vertical baffle.

  The opening area of the liquid flow path 96 is preferably such that the average flow rate is from 0.01 m / sec to 1 m / sec based on the amount of water flow. The lateral width of the opening of the liquid passage 96 can be determined by dividing the opening area of the liquid passage 96 by the height of the liquid passage opening.

  FIG. 18 shows a solid-liquid separation device 90H according to a comparative example to be described later. The first vertical baffle 95H has the same shape as the first vertical baffle 95 of FIG. And the top. The settling tank 97H is a cross-flow type square settling tank, and the liquid from the liquid passage 96 flows into the inflow portion formed by the vertical plate 97b and the bottom plate 97c, and the liquid is precipitated from the opening 97d below the inflow portion. It flows into the tank 97H. The trough 97f is provided in the tank wall upper part on the opposite side to this inflow part. Other configurations are the same as those of the solid-liquid separator 90A, and the same reference numerals indicate the same parts.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

[Example 1]
In Example 1, the solid-liquid separation process was performed using the solid-liquid separation apparatus 1A according to the first embodiment. Industrial water containing 300 mg / L of kaolin was used as water to be treated for solid-liquid separation treatment.

  First, in the mixing tank 4, polyaluminum chloride (PAC) was added to the water to be treated as an inorganic flocculant for aggregation treatment, and a 25% sodium hydroxide solution was added as a pH adjuster to make it neutral. The amount of polyaluminum chloride (PAC) added was 200 mg / L (as 10% (PAC) solution). Subsequently, 3 mg / L of PA301 as a polymer flocculant was added to the water to be treated in the agglomeration tank 15 to agglomerate the pollutants. When coagulating the pollutant, in the coagulation tank 15, the rotation direction of the stirring blade 22 of the stirring device 20 was rotated in the same direction as the direction in which the first vertical baffle 35 led the coagulated water to the communication port 17 and stirred. Thereafter, the agglomerated water was allowed to enter the settling tank 30, and the floc was precipitated and removed in the settling tank.

  When the concentration of suspended matter (SS concentration) in the treated water after floc was removed was measured, the measurement result of the suspended matter concentration (SS concentration) was 23 mg / L.

[Example 2]
In Example 2, the solid-liquid separation process was performed using the solid-liquid separation apparatus 1B according to the second embodiment. In Example 2, the stirring blade 22 of the stirring device 20 provided in the coagulation tank 15 was stirred by rotating it in the direction opposite to the direction in which the first vertical baffle 35 led the coagulated treated water to the communication port 17. However, the water to be treated and the added inorganic flocculant, pH adjuster and polymer flocculant are the same as in Example 1. When solid-liquid separation was performed in this way, in Example 2, the measurement result of the suspended solid concentration (SS concentration) was 16 mg / L.

  The measurement results of Example 2 using the solid-liquid separator 1B in which the first vertical baffle 35 rotates the stirring blade 22 in the direction opposite to the direction in which the agglomerated treated water is guided to the communication port 17, and the stirring blade 22 in the first vertical baffle When the measurement result of Example 1 using the solid-liquid separator 1A in which the baffle 35 rotates the coagulated treated water to the communication port 17 in the same direction is compared, the measurement result in Example 2 is 16 mg / L. There was a measurement result better than Example 1 which was 23 mg / L. For this reason, the rotary blades 22 of the agitator 20 are rotated in the coagulation tank 15 so that the first vertical baffle 35 imparts a turning force to the coagulated water in the direction opposite to the direction in which the coagulated water is guided to the communication port 17. As a result, suspended solids can be more effectively removed.

[Example 3]
In Example 3, the solid-liquid separation process was performed using the solid-liquid separator 1C according to the third embodiment. In the third embodiment, as in the case of the second embodiment, the first longitudinal baffle 35 is opposite to the direction in which the first vertical baffle 35 guides the agglomerated water to the communication port 17 in the agitation device 20 provided in the agglomeration tank 15. Rotated in the direction and stirred. Further, in the sedimentation tank 30, the swirl assist device 40 assists in swirling the agglomerated water. However, the water to be treated and the added inorganic flocculant, pH adjuster and polymer flocculant are the same as in Example 1 and Example 2. When solid-liquid separation was performed in this way, in Example 3, the measurement result of the suspended solid concentration (SS concentration) was 9 mg / L.

  The measurement result of Example 3 using the solid-liquid separation device 1C that assists the swirling of the flocculated water in the swirl assist device 40 provided in the settling tank 30 and the promotion of the flocculated water without the swirling assist device 40 being provided. When compared with the measurement result of Example 2 using the solid-liquid separation device 1B swirled only by force, the measurement result of Example 3 is 9 mg / L, and the measurement result of Example 2 was 16 mg / L. The measurement result better than the case was obtained. As is clear from this result, if the swirl assist device 40 is provided in the sedimentation tank 30 to assist the swirl of the agglomerated treated water in the sedimentation tank 30, the suspended solids can be removed more effectively.

[Example 4]
In Example 4, the solid-liquid separation process 1D was performed using the solid-liquid separation apparatus according to the fourth embodiment. In the solid-liquid separation device 1D used in the fourth embodiment, the coagulation tank 60 and the precipitation tank 80 are integrally configured, while the mixing tank 50 is provided independently of the coagulation tank 60 and the precipitation tank 80. It has been. The mixing tank 50 and the coagulation tank 60 are connected to each other by a transfer pipe 58, while the coagulation tank 60 and the settling tank 80 are connected to each other through a communication port 63 provided in the common part 62 of both. ing. Further, in the agglomeration tank 60, the first vertical baffle 70 is agitated by rotating the agitation blade 67 of the agitator 65 in the direction opposite to the direction in which the agglomerated treated water is guided to the communication port 63. However, the water to be treated and the added inorganic flocculant, pH adjuster and polymer flocculant are the same as in Example 1. When solid-liquid separation was performed in this manner, in Example 4, the measurement result of the suspended solid concentration (SS concentration) was 17 mg / L.

  The measurement result of Example 4 using the solid-liquid separation device 1D in which the mixing tank 50 and the coagulation tank 60 are separated and communicated by a transfer pipe 58, and the mixing tank 4 and the coagulation tank 15 are integrally formed. The mixing tank 4 and the agglomeration tank 15 were separated by a partition plate, and the solid-liquid separation apparatus 1B constituted by connecting the mixing tank 4 and the aggregation tank 15 to each other through the opening 6 of the partition plate 5 was used. When compared with Example 2, the measurement result of Example 4 is 17 mg / L, and there is almost no difference from Example 2 where the measurement result is 16 mg / L. As is clear from this, even if the mixing tank 50 is provided independently of the coagulation tank 60 and the mixing tank 50 and the coagulation tank 60 are connected by the transfer pipe 58, the coagulation tank 60 and the precipitation tank 80 are communicated. If the structure connected by the opening | mouth 63 is employ | adopted, the floc formed in the aggregation tank 60 will be moved to the sedimentation tank 80, without being decomposed | disassembled, and a floc can be precipitated effectively.

[Comparative Example 1]
In Comparative Example 1, the solid-liquid separation process was performed using the solid-liquid separation apparatus 100 shown in FIG. In the solid-liquid separation apparatus 100, a mixing tank 101, a coagulation tank 110, and a precipitation tank 120 are provided independently of each other. The mixing tank 101 and the coagulation tank 110 are connected with each other by a transfer pipe 108, and the coagulation tank 110 and the settling tank 120 are connected by a transfer pipe 118.

  The mixing tank 101 is formed in a cylindrical shape, and an introduction port 102 and a transfer pipe 108 are provided in the peripheral wall portion 103 thereof. In addition, the mixing tank 101 is provided with a stirring device 105.

  The outer shape of the agglomeration tank 110 is formed in a cylindrical shape, and the peripheral wall 113 has a transfer pipe 108 for transferring the water to be treated from the mixing tank 101 to the agglomeration tank 110, and the agglomeration treated water from the agglomeration tank 110 to the precipitation tank 120. A transfer pipe 118 is attached to the pipe. The mixing tank 101 is provided with a stirring device 115. In the state shown in FIG. 9, the stirring device 115 rotates the stirring blade 116 in the counterclockwise direction, and applies a turning force in the same direction as the direction in which the agglomerated treated water is guided to the transfer pipe 118.

  The sedimentation tank 120 is a swirl type sedimentation tank that precipitates flocs while swirling the coagulated water that has entered the interior. The outer shape of the sedimentation tank 120 is formed in a cylindrical shape, and a transfer pipe 118 that transports the coagulated water from the aggregation tank 110 to the precipitation tank 120 is attached to the peripheral wall portion 121 thereof. The transfer pipe 118 is attached obliquely with respect to the tangential line of the peripheral wall 121 at the portion where the transfer pipe 118 is attached, and the agglomerated treated water entering the settling tank 120 is set in the settling tank. It is made to turn inside 120.

  An upper portion of the sedimentation tank 120 is provided with a water intake trough 125 and a discharge pipe 126 connected to the water intake trough 125. The supernatant liquid of the precipitation tank 120 is caused to flow into the water trough 125, and the treated water is discharged into the discharge pipe 126. From outside.

  When the concentration of suspended solids (SS concentration) is obtained using the solid-liquid separation device 100 according to Comparative Example 1, the water to be treated and the added inorganic flocculant, pH adjuster, and polymer flocculant The agent is the same as in Example 1.

  In Comparative Example 1, the measurement result of the suspended matter concentration (SS concentration) was 51 mg / L. As is apparent from this measurement result, when the solid-liquid separation device 100 is configured by connecting the agglomeration tank 110 and the sedimentation tank 120 through the transfer pipe 118, the solid-liquid separation apparatuses 1A, 1B, 1C, and 1D according to the present invention are configured. When the shared parts 16 and 62 are provided in the peripheral wall parts 3 and 61 of the aggregation tanks 15 and 60 and the peripheral wall parts 31 and 81 of the sedimentation tanks 30 and 80, and the communication ports 17 and 63 are formed in the shared parts 16 and 62 It can be seen that the removal efficiency of pollutants is lower than

[Comparative Example 2]
In Comparative Example 2, the solid-liquid separation process was performed using the solid-liquid separator 130 shown in FIG. The solid-liquid separation device 130 has an overall configuration similar to the solid-liquid separation devices 1A, 1B, 1C according to the first to third embodiments of the present invention, and a mixing tank to which an inorganic flocculant and a pH adjuster are added. 133, a coagulation tank 150 to which a polymer coagulant is added and a precipitation tank 170 for precipitating flocs are integrally formed. In the treatment tank 131 composed of the mixing tank 133 and the agglomeration tank 150, the defective portion 132 a formed in the peripheral wall portion 132 is abutted against the peripheral wall portion 171 of the sedimentation tank 170, and the abutted defective portion 132 a is It is joined to the peripheral wall part 171 and formed integrally. For this reason, in the defect | deletion part 132a, the shared parts 137 and 138 which share the surrounding wall part 132 of the processing tank 131 and the surrounding wall part 171 of the sedimentation tank 170 are formed.

  The processing tank 131 is provided with a partition plate 135 therein, and the partition plate 135 divides the inside of the processing tank 131 into a mixing tank 133 and a coagulation tank 150. An opening 136 is formed in the partition plate 135 so that the water to be treated can be moved from the mixing tank 133 to the aggregation tank 150. Further, the mixing tank 133 and the coagulation tank 150 are respectively provided with stirring devices 140 and 155 for stirring the water to be treated.

  A common port 138 between the peripheral wall 131 of the coagulation tank 150 and the peripheral wall 171 of the sedimentation tank 170 is formed with a communication port 160 that communicates the coagulation tank 150 and the sedimentation tank 170. The coagulated water that has been coagulated in the coagulation tank 150 passes through the communication port 160 and enters the precipitation tank 170. The agitation device 155 provided in the flocculation tank 150 rotates the rotating blade 156 in the direction opposite to the direction toward the communication port 160 by the propulsive force of the flocculated water.

  The difference from the solid-liquid separators 1A, 1B, 1C, and 1D according to the present invention is that the coagulation tank 150 is not provided with the first vertical baffle, and only the sedimentation tank 170 is provided with the second vertical baffle 165. It is a point.

  When the suspended solid concentration (SS concentration) is obtained using the solid-liquid separation device 130 according to Comparative Example 2, the water to be treated, the added inorganic flocculant, the pH adjuster, and the polymer flocculant The agent is the same as in Example 1.

  In Comparative Example 2, the measurement result of the suspended matter concentration (SS concentration) was 38 mg / L. As is clear from this measurement result, even if a vertical baffle is provided only in the sedimentation tank 170, a good swirl flow cannot be formed in the sedimentation tank 170 unless a vertical baffle is provided in the coagulation tank 150. It can be seen that the removal efficiency is low.

  Table 1 shows the measurement results of Examples 1 to 4 and Comparative Examples 1 and 2.

  As shown in Table 1, even in Example 1 in which the suspended matter concentration (SS concentration) is the highest, the suspended matter concentration (SS concentration) is only 23 mg / L. In contrast, in the measurement result of Comparative Example 1, the suspended solid concentration (SS concentration) was 51 mg / L. Comparing this numerical value, the measurement result of Example 1 is about 45% of the measurement result of Comparative Example 1, and the concentration of suspended solids (SS concentration) is less than half. Even if the measurement result of Example 1 is compared with the measurement result of Comparative Example 2, the measurement result of Example 1 is about 60% of the suspended solid concentration (SS concentration) of the measurement result of Comparative Example 2. Is suppressed.

  As can be seen from this measurement result, a common part that shares the peripheral wall part of the coagulation tank and the peripheral wall part of the sedimentation tank is provided, a communication port that communicates the coagulation tank and the sedimentation tank is formed in this common part, and If a vertical baffle is provided in both the tank and the settling tank, and the coagulated water is appropriately guided by the vertical baffle and enters the settling tank through the communication port, the pollutant can be effectively removed.

[Examples 5 to 11, Comparative Example 3]
Biologically treated water (SS concentration 300 mg / L) of organic wastewater was used as raw water, and solid-liquid separation processing was performed by the solid-liquid separation device of FIGS. 11 to 17 (Examples 5 to 11) and FIG. 18 (Comparative Example 3). The inorganic flocculant added to the mixing tank was PAC (added amount 200 mg / Las 10% solution) and neutralized with a 25% sodium hydroxide solution as a neutralizing agent. In the coagulation tank, 3 mg / L of polymer coagulant was added.

  Table 2 shows the treated water SS concentrations of Examples 5 to 11 and Comparative Example 3.

  As shown in Table 2, according to the apparatus of the present invention, the SS concentration flowing out into the treated water can be lowered.

1A, 1B, 1C, 1D, 90A to 90H Solid-liquid separator 2 Processing tank 3 Peripheral wall part 4, 50, 92 Mixing tank 5 Partition plate 6 Opening part 7 Common part 8,51 Inlet port 10,55 Stirrer 12,57 Stirring blade 15, 60, 94 Coagulation tank 16, 62 Common part 17, 63 Communication port 20, 65 Stirring device 22, 67 Stirring blade 30, 80, 97 Sedimentation tank 31, 81 Peripheral wall 35, 70, 95, 95B, 95D , 95G, 95H First vertical baffle 36, 71, 98 Second vertical baffle 38, 83, 97a Intake trough 39, 84 Drain pipe 40, 99 Turning assist device 43 Rotating arm

Claims (10)

A coagulation tank for coagulating the pollutant by adding a coagulant to the water to be treated;
A cylindrical sedimentation tank that solid-liquid separates the agglomerated water that has been agglomerated in the agglomeration tank to precipitate pollutants, and
In the solid-liquid separation device, which is a swirl flow settling tank in which a swirling flow is generated inside the settling tank by the driving force of the aggregating treated water itself entering,
The coagulation tank and the settling tank are installed close to each other so that the distance L between centers thereof satisfies the relationship of Lmin ≦ L ≦ Lmax with respect to Lmin and Lmax defined below. Solid-liquid separation device.
Lmin: (R + r) × 0.8,
Lmax: (R + r) × 1.2 or (R + r + d), whichever is larger,
r: agglomeration tank radius,
R: Settling tank radius,
d: width of the flow path for allowing the flocculated water to communicate from the flocculation tank to the settling tank when the flocculation tank and the settling tank are separated A liquid passage is provided to allow the agglomerated water to enter the settling tank,
The coagulation tank is provided with a first vertical baffle for guiding the coagulation treated water of the coagulation tank to the liquid flow path,
The solid-liquid separation device according to claim 1, wherein the sedimentation tank is provided with a second vertical baffle that guides the coagulated treated water from the liquid flow path into the sedimentation tank.   The first vertical baffle extends in an oblique direction with an intersecting angle of 30 to 60 ° with respect to the radial direction of the coagulation tank, and the second vertical baffle intersects with the radial direction of the settling tank. A solid-liquid separator characterized by extending in an oblique direction with an angle of 30 to 60 °.   The solid-liquid separator according to claim 2 or 3, wherein the first vertical baffle and the second vertical baffle are substantially parallel to each other. A common part that shares a peripheral wall surface is formed in the peripheral wall part of the coagulation tank and the peripheral wall part of the precipitation tank, and the common part communicates with the coagulation tank and the precipitation tank as the liquid flow path. There is a mouth,
The first vertical baffle is continuous with one side edge of the communication port,
5. The solid-liquid separator according to claim 2, wherein the second vertical baffle is continuous with the other side edge of the communication port. 6.   The height dimension of the first vertical baffle and the length dimension extending from the common part, and the height dimension of the second vertical baffle and the length dimension extending from the common part are 1 / diameter of the diameter of the settling tank. It is 100-1 / 10, The solid-liquid separation apparatus of Claim 5 characterized by the above-mentioned.   7. The solid-liquid separation according to claim 2, wherein a height dimension of the liquid passage is 50 to 100% of a height dimension of the first and second vertical baffles. apparatus. The agglomeration tank is provided with a stirring device for swirling the agglomerated water inside,
The solid-liquid separation device according to any one of claims 2 to 7, wherein the swirling direction is a direction opposite to a direction in which the first vertical baffle guides the coagulated treated water to the liquid passage. . The settling tank is provided with a turning auxiliary device for assisting in the direction of turning the coagulated treated water that has entered the inside of the settling tank,
The solid-liquid separation device according to any one of claims 2 to 8, wherein the swivel assist device has a swivel portion disposed below the lower end of the second vertical baffle.   The swivel assist device includes a rotating shaft that extends in the vertical direction in the axial center of the settling tank, and a plurality of rotating arms that serve as the swiveling portion that extend in a radial direction from a lower portion of the rotating shaft. The solid-liquid separator according to claim 9.

Images