KR20090033020A - Flocculation device - Google Patents

Abstract

A flocculation apparatus is provided to produce magnetism micro floc and magnetic floc excellently with planning miniaturization of the apparatus at the same time. A flocculation apparatus(14) includes a high speed stirring tub(14A), a labyrinth-shaped retardation chamber(14C), a slow agitation tank(14B). The high speed agitation tank and a speed reducing agitation tank are assembled integrally on a casing(40). The slow agitation tank is a successive three-stage agitation tank. Each agitation tank includes agitation vanes(19). An opening(52A) for flowing treated water is formed on one side wall(52) of the flocculation apparatus.

Description

Coagulation Device {FLOCCULATION DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agglomeration apparatus, wherein after stirring treated water at a high speed with a rapid stirring tank, the treated water is stirred at a low speed with a slow stirring tank to remove magnetic flocs in the treated water. The present invention relates to a flocculating apparatus for producing.

BACKGROUND ART As a device for removing contaminants present in treated water, such as sewage or plant drainage, a known contaminant purification system consisting of a flocculating device and a magnetic separation device has been known. The flocculating device adds a flocculant and a magnetic component to the treated water and stirs them to produce a dirty floc in the treated water as a magnetic floc. In addition, the magnetic separation device absorbs and removes the magnetic flocs generated by the flocculation device by adsorbing the magnetic disk on which the plurality of magnets are disposed.

Patent Literature 1 discloses a coagulation apparatus including a first stirring bath for stirring the treated water at high speed and a second stirring bath for stirring the treated water at low speed, and generating a magnetic floc in the treated water by such stirring bath.

In this coagulation apparatus, the first agitator and the second agitator are connected through a pipe, and by rapidly stirring the treated water by the first agitator, a magnetic microfluid of about several hundred micrometers is generated, and the magnetic microfloc is passed through the pipe. The water is sent to the second stirring tank together with the treated water. Then, by slowly stirring the treated water by the second stirring bath, the magnetic microflocs are formed into magnetic flocks having a size of several mm.

Patent Document 1: Patent Publication No. 2005-218887

However, the flocculation device of Patent Document 1 has a problem that the device itself is enlarged because the first agitator and the second agitator are constituted by separate bodies through piping.

Further, in the coagulation apparatus of Patent Document 1, since the treated water flowing into the first and second stirring tanks has a free surface, the free surface fluctuates in an environment that fluctuates like a ship, and thus the flow in the first stirring bath and There was also a problem that the magnetic microflux and the magnetic flocs could not be produced satisfactorily by affecting the flow in the second stirring tank.

In addition, in the flocculation apparatus of Patent Document 1, since the high-speed treated water from the first agitator bath flows directly into the second agitator through a pipe, the magnetic flux generated by the turbulence in the treated water in the second agitator is generated in the turbulent flow. There was also the problem of being destroyed by.

This invention is made | formed in view of such a situation, Comprising: It aims at providing the flocculation apparatus which can aim at miniaturization of a device, and can produce | generate a magnetic microflux and a magnetic floc well.

In order to achieve the above object, the invention described in claim 1 generates a magnetic microfloc in the treated water by rapidly stirring the treated water to which the magnetic component and the coagulant are added by a stirring blade rotating at a first rotational speed. To reduce the treated water flowing out from the rapid stirring tank at a predetermined flow rate, wherein the deceleration chamber to which the polymer flocculant is added to the treated water and the treated water flowing out of the deceleration chamber are lower than the first rotational speed. An agglomeration apparatus having a slow stirring tank which generates a magnetic floc in the treated water by stirring at low speed by a stirring blade rotating at a second low rotation speed, wherein the rapid stirring tank, the deceleration chamber, and the slow stirring tank are assembled in the same casing. Are integrated and sealed at the same time, the water flows from the rapid stirring tank, the deceleration chamber and the slow stirring tank It is characterized by the excess.

According to the invention described in claim 1, since the rapid stirring tank, the deceleration chamber, and the slow stirring tank are assembled and integrated in the same casing, the apparatus can be miniaturized. In addition, the rapid stirring tank, the slowing chamber and the slow stirring tank have a sealed structure, so that the treated water passes through the water in the rapid stirring tank, the slowing chamber, and the slow stirring tank, so that the treated water is gas-liquid in the rapid stirring tank, the slowing chamber, and the slow stirring tank. It does not have an interface (free surface). As a result, even in an environment with fluctuations such as a ship, the treated water flows smoothly in a rapid stirring tank, a deceleration chamber, and a slow stirring tank without becoming turbulent flow. This makes it possible to produce magnetic microflocs and magnetic flocs well.

In the invention described in claim 2, the slow stirring tank is a multi-stage stirring tank in which a plurality of stages are continuous, and stirring blades are provided in each stirring tank, and the rotational speed of each stirring blade is generated by the magnetic flocs. It is characterized in that it is set so that it may become low speed from the upstream side to the downstream side of treated water so that it may not be destroyed by the flow velocity of.

According to the invention described in claim 2, the rotation speed of the stirring blades provided in each stirring tank of the slow stirring tank was set so as to be low speed from the upstream side to the downstream side of the treated water so that the generated magnetic flocs were not destroyed by the flow rate of the treated water. . As a result, the magnetic flocs can be satisfactorily produced in the slow stirring tank.

In the invention described in claim 3, in the multi-stage stirring tank according to claim 2, the adjacent tanks are divided by the bot-bank and at the same time the peripheral speed of the stirring blades of the upstream tank and the upstream tank The size of the opening for processing water outflow formed in the bot dam which divides an upstream tank and a downstream tank so that the speed of the process water which flows out into into a downstream tank from () is set to be the same.

According to the invention described in claim 3, in the multistage agitation tank of a slow agitation tank, the adjacent jaw is divided by a bot dam, and the circumferential speed of the stirring blades of an upstream jaw and its upstream jaw The size of the opening for treatment water outflow formed in the bot bank dividing the upstream tank and the downstream tank is set so that the speed of the treated water flowing out from the downstream tank is the same. As a result, the magnetic flocs can be satisfactorily produced in the slow stirring tank.

It is preferable that the rapid agitation tank be airtight and have a water removal tube so as not to have a free surface by using the treated water in a full state while being sealed. This is because if the surface has a free surface, the free surface oscillates in an environment such as a ship, which affects the flow of treated water in the rapid stirring tank. On the other hand, when the rapid stirring tank is used in the full water sealed state as in the present invention, the flow of the treated water in the rapid stirring tank is not affected by the shaking even in the swinging environment. The rapid stirring tank of the present invention is a continuous stirring tank in which treated water is continuously supplied, but since it is used in a closed state of full water, the flow of the internal treated water is controlled by the pressure gradient derived from the pump, the internal structure of the rapid stirring tank, and Determined by the internal agitator, the flow does not depend on oscillation or tilt. That is, the flow of processing does not change from the coordinate system seen from the rapid stirring tank or the stirrer.

Moreover, in a rapid stirring tank, it is preferable to set it as the structure which arranged the normal direction of the entrance and exit of a rapid stirring tank perpendicularly to the axis of a stirrer so that the direction of the average flow of a rapid stirring tank may become parallel with the axis of the stirrer of a rapid stirring tank. By arranging the normal direction of the entrance and exit and the direction of the axis of the stirrer vertically, the direction of the average flow in the rapid stirring vessel coincides with the axial flow direction. As a result, a short circuit of the flow path due to the large rotational circulation due to the rotation of the stirring blade becomes difficult. In addition, the flow due to the rotation of the axial stirrer can be generated to realize the actual residence time close to the ideal value of the hydraulic residence time.

Moreover, in a rapid stirring tank, it is preferable to arrange | position so that the front normal of a stirring blade may oppose an inflow fluid normal when the surface of a stirring blade moves near an entrance with respect to the normal direction of an inlet of a rapid stirring tank. As the discharge flow from the front surface of the stirring blade resists the flow of the stirring blade against the normal flow of the inlet when the inlet normal direction and the face of the stirring blade approach the inlet, a short circuit of the flow flowing into the rapid stirring tank can be avoided. have.

Moreover, in a rapid stirring tank, it is preferable to set it as the structure of a closed square tank. By making a rapid stirring tank into a square stirring tank, it is not necessary to provide structures, such as a baffle plate for promoting turbulence required for stirring-mixing reaction inside.

Also in a slow stirring tank, it is preferable to be equipped with air and a water removal pipe | tube so that it may be closed and it does not have a free surface using process water in full water. Accordingly, since the slow stirring tank does not have a gas-liquid interface in the full state, the influence on the flow by the free surface does not appear. Specifically, in a ship swinging environment, this free surface moves and affects the flow in the slow stirring tank. However, by using the slow stirring tank in a full water condition, the flow in the slow stirring tank is not affected by the shaking even in a swinging environment. On the other hand, when there is an air layer in a stirring tank and has a free surface, the water (including air) inside moves as the stirring tank swings. The slow stirring tank of the present invention is a continuous stirring tank with continuous inflow and out of water, but since it is used in a full water sealed state, the flow of water inside is controlled by the pressure gradient derived from the pump, the internal structure of the slow stirring tank, and the internal stirring device. It is determined that the flow does not depend on oscillation or slope. That is, the flow does not change from the coordinate system seen from the slow stirring tank or the stirrer.

In addition, it has a structure to gradually reduce the flow rate of water flowing into the magnetic flop generating means by installing a deceleration chamber having a bypass flow structure as part of the slow stirring tank at the intermediate position between the rapid stirring tank and the slow stirring tank. The rapid and slow stirring tanks are different stirring tanks, but because they are a series of continuous stirring reactors arranged in series, they are connected by flow path piping. It is possible to reduce the speed of the treated water while avoiding the enlargement of the deceleration chamber by providing a deceleration chamber in the middle portion between the rapid stirring vessel and the slow stirring vessel and making the flow path in the deceleration chamber bypass flow. Thereby, the short circuit of the flow which flows into a slow stirring tank can be avoided.

Moreover, also in a slow stirring tank, it is preferable to set it as the structure which arranged the normal direction of the entrance and exit of a slow stirring tank perpendicularly to the axis of a stirrer so that the direction of the average flow of a slow stirring tank may become parallel with the axis of the stirrer of a slow stirring tank. By arranging the normal direction of the entrance and exit directions of the stirrer vertically, the direction of the average flow in the slow stirring tank coincides with the axial flow direction. As a result, a short circuit of the flow path due to the large rotational circulation due to the rotation of the stirring blade becomes difficult. In addition, the flow due to the rotation of the axial stirrer can be generated to realize the actual residence time close to the ideal value of the hydraulic residence time.

Moreover, also in a slow stirring tank, it is preferable to arrange | position so that the front normal of a stirring blade may oppose an inflow fluid normal when the surface of a stirring blade moves near an entrance with respect to the normal direction of a slow stirring tank inlet. When the inlet normal direction and the surface of the stirring blade approach the inlet, the discharge flow from the front surface of the stirring blade resists the flow in the normal direction of the inlet, so that short circuit of the flow flowing into the slow stirring tank can be avoided. have.

Moreover, also in a slow stirring tank, it is preferable to set it as the structure of a closed square multi-stage. By using a slow stirring tank as a square stirring tank, there is no need to provide a structure such as a baffle plate for promoting turbulence required for the stirring mixing reaction inside. Moreover, it is easy to make a slow stirring tank into a multistage series structure. As the stirring rotation speed moves from the upstream side to the downstream side, it is possible to promote growth by avoiding the destruction of the magnetic flocks that are made smaller in steps.

According to the flocculation apparatus according to the present invention, the rapid stirring tank, the deceleration chamber, and the slow stirring tank are assembled into the same casing and integrated, so that the apparatus can be miniaturized. In addition, as the sealed structure of the quick agitator, the deceleration chamber, and the slow agitator tank passes the treated water in a full state in the quick agitator, the deceleration chamber, and the slow agitator, the treated water is free from the rapid agitator, the deceleration chamber, and the slow agitator. Does not have a surface As a result, the treated water flows smoothly in turbulent agitation tanks, deceleration chambers, and slow agitation tanks without turbulence even in an environment with fluctuations such as ships, thus generating good magnetic microflocs and magnetic flocs. can do.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the flocculation apparatus which concerns on this invention is described in detail according to an accompanying drawing.

FIG. 1: is a block diagram explaining the flow which assembled the flocculation apparatus 14 of embodiment to the wastewater purification system 10. As shown in FIG. 2 is a conceptual diagram of the coagulation apparatus 14, the magnetic separation apparatus 20, and the filter separation apparatus 24 which comprise the wastewater purification system 10. As shown in FIG.

In the filthy water purification system 10 shown in FIG. 1, the treated water is fed to the rapid stirring tank 14A of the flocculator 14 by the treated water pump 12. As shown in FIG. In addition, a magnetic powder adding device 16 for adding a magnetic powder to a middle portion of a pipe connecting the treated water pump 12 and the rapid stirring tank 14A, and a flocculant adding device 18 for adding a flocculant. The magnetic powder and flocculant are added to the treated water flowing in the pipe. As the magnetic component, for example, ferric trioxide can be preferably used. As the coagulant, a water-soluble inorganic coagulant such as polyaluminum chloride, iron chloride, ferric sulfate can be preferably used. In addition, although not shown, it is preferable to install a strainer at the front end to which magnetic material or flocculant is added to the treated water and to remove relatively large dirt of several millimeters by this strainer. Do.

In the rapid stirring tank 14A, the treated water, the added magnetic powder, and the flocculant are rapidly stirred by the stirring blade 19 rotating at high speed. As a result, microscopic magnetic microflocs of the order of several tens of micrometers are produced in the rapid stirring tank 14A. As a rotational circumferential speed in the stirring blade 19, it is preferable to implement about 1-2 m / sec. Magnetic microflocs contain magnetic components, solid suspended particles in treated water, bacteria, plankton, and the like.

The treated water containing the magnetic microfloc is fed to the slow stirring tank 14B through the deceleration chamber 14C of the flocculator 14. In addition, a polymer coagulant adding device 21 for adding a polymer coagulant is provided in the vicinity of the speed reduction chamber 14C that communicates the rapid stirring tank 14A and the slow stirring tank 14B, and flows through the speed reducing chamber 14C. Polymeric coagulant is added to the treated water. As the polymer flocculant, anionic and nonionic types can be suitably used.

The slow stirring tank 14B has the stirring blade 19 which rotates a magnetic micro floc and a polymer flocculant at low speed. The magnetic blade F having a size of several hundreds of micrometers to several mm is produced by stirring the magnetic microflux and the polymer flocculant at low speed by the stirring blade 19. As shown in FIG. 2, the slow-stirring tank 14B is comprised from three successive multistage stirring tanks A, B, and C. As shown in FIG. In this case, it is set so that the rotation speed of the stirring blades 19 provided in each may become low speed as it goes to the stirring tank C of a downstream from the stirring tank A of an upstream. As a result, the magnetic microflocs grow greatly as they are directed from the upstream stirring vessel A to the downstream stirring vessel C, and at the same time, the grown magnetic flocs F can be prevented from being destroyed by the stirring vanes 19. Can be. For example, as a rotation circumferential speed in the front-end | tip part of the stirring blade 19, about 0.5-1 m / sec of stirring tank A, about 0.3-0.7 m / sec of stirring tank B, and stirring tank C Is preferably about 0.1 to 0.3 m / sec.

As shown in Fig. 2, the agglomeration apparatus 14 can be assembled to the same horizontal casing 40 in which the rapid stirring vessel 14A, the reduction chamber 14C, and the slow stirring vessel 14B are the same. Consists of. The deceleration chamber 14C is formed in a labyrinth by two bots 42 and 44 (v) in order to decelerate the fast treated water at the speed of flowing out from the rapid stirring tank 14A.

In addition, the rapid stirring tank 14A, the deceleration chamber 14C, and the slow stirring tank 14B of the flocculator 14 have air bleeding out, and the process water is in full water. As a result, even if the wastewater purification system 10 is mounted on the ship and the ship is shaken by the waves, the treated water in the tanks 14A, 14C, and 14B of the flocculator 14 is rocked (watery). It flows smoothly from the rapid stirring tank 14A to the slow stirring tank 14B through 14C of reduction chambers. In FIG. 2, the code | symbol 46 is the air exhaust valve provided in the upper part of each layer (14A of rapid stirring tanks and the multistage stirring tanks A, B, C of slow stirring tank 14B).

The treated water containing the magnetic flocs F grown to a predetermined size is sent to the magnetic separation device 20. The magnetic separation device 20 adsorbs and separates the magnetic flocs F in the treated water by magnetic force, and the magnetic separation device 20 separates and removes about 95% of the magnetic flocs F in the treated water. .

The magnetic flocs F removed by the magnetic separation device 20 are reduced to about 80% water content by a dehydration device 25 such as a centrifuge or a belt press, and then trucked to a landfill, incinerator, or compost manufacturing plant. It is conveyed to and processed.

On the other hand, the treated water treated in the magnetic separation device 20 is sent to the filter separation device (24).

In the filter separation device 24, the treated water is supplied to the inside of the drum-type filter 26 that rotates through the treated water supply pipe 32. The treated water supplied to the inside of the drum-type filter 26 is filtered by flowing the drum-type filter 26 from the inside to the outside, so that the collected matter such as the magnetic flocs F remaining in the treated water is the drum-type filter 26. Is removed by a mesh filter of about 25 μm. This purifies the treated water containing contaminants such as dirt, solid suspended particles, bacteria and plankton.

The collection material such as the magnetic flocks F attached to the inside of the drum-type filter 26 is discharged from the spray nozzle 28 disposed above the drum-type filter 26. By spraying toward the drop hopper 34 in the drum-shaped filter 26 is discharged out of the filter separator 24 through the collection discharge pipe 36. In this case, a part of the treated water purified by the drum-type filter 26 is returned to the spray nozzle 28 by the circulation pump 29 and used as water sprayed from the spray nozzle 28. In addition, the collected material such as the magnetic flop F and the water sprayed from the spray nozzle 28 are returned to the front end of the treated water pump 12 by the pump 30 connected to the collected discharge pipe 36.

Next, the structure and characteristic of the flocculation apparatus 14 are demonstrated in detail.

As shown in Figs. 2 and 3, the flocculator 14 is assembled by integrating a rapid stirring vessel 14A, a reduction chamber 14C and a slow stirring vessel 14B in the same casing 40. For this reason, compared with the conventional flocculation apparatus which connected the rapid stirring vessel and slow stirring vessel via piping, the apparatus is aimed at miniaturization.

In addition, 14 A of slow stirring tanks, the reduction chamber 14C, and the slow stirring tank 14B are sealed, and the process water is fully filled in the rapid stirring tank 14A, the slowdown chamber 14C, and the slow stirring tank 14B. The treated water does not have a free surface in the rapid agitation tank 14A, the deceleration chamber 14C, and the slow agitation tank 14B. Therefore, even in a fluctuating environment such as a ship, in the rapid stirring tank 14A, the deceleration chamber 14C, and the slow stirring tank 14B, the treated water does not become a turbulent flow, but is laminar. Flows smoothly. As a result, the magnetic microflocs and the magnetic flocs F can be produced well.

In addition, the slow stirring tank 14B of this flocculator 14 is a continuous three-stage multistage stirring tank, and stirring blades 19, 19, 19 are provided in each stirring tank A, B, C of the slow stirring tank 14B. ) Is installed. And the rotational speed of each stirring blade (19, 19, 19) is set to be a low speed from the upstream side to the downstream side of the treated water so that the magnetic flux (F) generated as described above is not destroyed by the flow rate of the treated water have. Thereby, the magnetic flocks F can be produced satisfactorily in each stirring tank A, B, C of the slow stirring tank 14B.

In addition, while the stirring tank A and the stirring tank B of the slow stirring tank 14B are divided by the bot dam 48, the adjacent stirring tank B and the stirring tank C are the bot dam ( 50; i) divided by i). And the speed | rate of the circumferential speed (about 0.5-1 m / sec) of the stirring blade 19 of the upstream stirring tank A, and the processing water which flows out from this stirring tank A to the downstream stirring tank B becomes equal. The size of the opening 48A for treatment water outflow formed in the bot dam 48 which divides the upstream stirring tank A and the downstream stirring tank B is set. Similarly, the circumferential speed (about 0.3-7 m / sec) of the stirring blade 19 of the upstream stirring tank B and the speed of the process water which flows out from this stirring tank B to the downstream stirring tank C become equal. The size of the opening 50A for treatment water outflow formed in the bot dam 50 which divides the upstream stirring tank B and the downstream stirring tank C is set. Then, the circumferential speed (about 0.1 to 0.3 m / sec) of the stirring blade 19 of the stirring vessel C and the speed of the treated water flowing out from the stirring vessel C to the downstream magnetic separation device 20 become the same. The size of the opening 52A for treated water outflow, in which the stirring vessel C and the magnetic separation device 20 are formed on one wall 52 of the flocculation device 14, is set. Thereby, the magnetic flocks F can be produced satisfactorily in each stirring tank A, B, C of the slow stirring tank 14B.

Further, in the flocculator 14, the treated water flows from the circular opening 54A formed in the other wall 54 of the flocculator 14 into the rapid stirring vessel 14A and rotates counterclockwise in FIG. It stirs at high speed by the stirring blade 19 of 14 A of rapid stirring tanks. This treated water enters into the labyrinth-shaped deceleration chamber 14C consisting of three bot dams 42, 43, and 44 from the circular opening 42A formed in the bot dam 42, thereby reducing the speed of the deceleration chamber 14C. Its speed is slowed down within. The decelerated process water flows into the stirring tank A of the slow stirring tank 14B from the processing water outflow opening 44A formed in the lower right side of the bot dam 44. At this time, the size of the processing water outflow opening 44A is set so that the speed of the processing water flowing into the stirring tank A and the speed of the processing water flowing through the stirring tank A become the same. Then, the treated water flowing into the stirring tank A is stirred at a low speed by the stirring blades 19 of the stirring tank A rotating in the clockwise direction in FIG. 3, and the treated water flows out on the upper right side of the bot dam 48. It flows into the stirring tank B from 48 A of opening parts. And the treated water flowing into the stirring tank (B) is agitated at a low speed by the stirring blade 19 of the stirring tank (B) rotated in the clockwise direction in Figure 3 for the treatment water outflow formed in the lower portion of the bot dam 50 It flows into the stirring tank C from the opening part 50A. Then, the treated water flowing into the stirring tank C is stirred at a low speed by the stirring blades 19 of the stirring tank C rotating in the counterclockwise rotation on FIG. 3, and the treated water flows out at the upper portion of the wall 52. It flows into the magnetic separation apparatus 20 from the opening part 52A.

In addition, since the flow velocity of the treated water is set to be slowed as it goes from the upstream side to the downstream side of the treated water, the sizes of the openings 44A, 48A, 50A, 52B described above are downstream from the upstream side of the treated water. It is set so that opening area may become large as it goes to the side.

In addition, although the coagulation apparatus 14 in which each tank was connected in the horizontal direction was demonstrated in embodiment, it is not limited to this form, but each tank is similar to the coagulation apparatus 15A shown in FIG. It may be connected in a rectangular shape in the horizontal direction, or may be connected in series in a vertical direction as in the flocculation device 15B shown in FIG. 5, or may be connected in a vertical manner as in the flocculation device 15C shown in FIG. 6. It may be connected in a rectangular shape in the straight direction. That is, the shape may be changed depending on the space of the place where the flocculator is installed. 4-6 show the inflow direction of the treated water, the outflow direction, and the rotation direction of the stirring blade, respectively.

4-6, since the same code | symbol is attached | subjected about the part which is the same as or similar to the flocculation apparatus 14 shown in FIG. 3, the description is abbreviate | omitted here. In addition, in the flocculation apparatus 15C of FIG. 6, a bot dam 49 is provided for guiding the treated water flowing out of the treated water outflow opening 48A to an upper portion of the tank. It flows out into the next tank from the process water outflow opening 49A formed in the upper part of the top.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram of the wastewater purification system which assembled the flocculation apparatus of embodiment.

2 is a conceptual diagram of an apparatus constituting the filthy water purification system;

3 is a perspective view of the inside of the flocculation apparatus shown in FIG. 2;

4 is a schematic view showing another embodiment of the flocculator;

5 is a schematic view showing another embodiment of the flocculator;

6 is a schematic view showing another embodiment of the flocculator;

<Explanation of symbols for main parts of drawing>

10: sewage water purification system 12: treated water pump

14: flocculator 14A: rapid stirring tank

14B: Slow Stirring Tank 14C: Reduction Chamber

16: magnetic component adding device 18: flocculant adding device

19: stirring blade 20: magnetic separator

24: filter separation device 25: dewatering device

26 drum type filter 28 spray nozzle

29: circulation pump 30: pump

32: treated water supply pipe 33: outflow hole

34: Hopper 36: collection discharge pipe

40 casing

42, 43, 44, 48, 50: Bot dam 46: Air exhaust valve

F: Magnetic Flux

Claims (3)

A rapid stirring tank for generating magnetic microflocs in the treated water by rapidly stirring the treated water to which the magnetic component and the coagulant are added by a stirring blade rotating at a first rotational speed, and the treatment flowing out of the rapid stirring tank. The water is decelerated at a predetermined flow rate, and a deceleration chamber in which the polymer flocculant is added to the treated water and a stirring blade rotating the treated water flowing out of the deceleration chamber at a second rotation speed lower than the first rotation speed. In the flocculation apparatus provided with the slow stirring tank which produces a magnetic floc in a process water by stirring at low speed, And said rapid agitator, deceleration chamber, and slow agitator are assembled and integrated into the same casing and sealed at the same time so that the treated water passes through the water in said rapid agitator, deceleration chamber, and slow agitator. The slow stirring tank of claim 1, wherein the slow stirring tank is a multistage stirring tank in which a plurality of stages are continuous, and stirring blades are provided in each stirring tank, and the rotating speed of each stirring blade is not destroyed by the flow rate of the treated water. And a setting device so as to be at a low speed from the upstream side to the downstream side of the treated water. 3. The multistage agitating tank is characterized in that the adjacent jaw is divided by a bot duct, and at the same time the circumferential speed of the stirring blades of the upstream jaw and the downstream jaw from the upstream jaw thereof. A flocculation device characterized in that the size of the opening for treating water outflow is formed in the bot dam that divides the upstream side and the downstream side so that the velocity of the outflowing treatment water becomes the same.

Images