KR101176897B1 - Flocculation device - Google Patents

Abstract

The present invention provides an agglomeration apparatus capable of miniaturizing the apparatus and at the same time producing magnetic microflocs and magnetic flocs well.

In the flocculation apparatus 14 of the present invention, the rapid stirring vessel 14A, the deceleration chamber 14C, and the slow stirring vessel 14B are assembled in the same casing 40, and are configured as an integrated structure device. The deceleration chamber 14C is formed in a labyrinth by two bots 42 and 44 in order to reduce the speed of the raw water 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 flocculating apparatus 14 have air leaked out, and the raw water is in full water. As a result, even if the wastewater purification system 10 is mounted on the vessel and the fluctuations occur in the vessel due to the wave, the raw water is not waved in the tanks 14A, 14C, and 14B of the flocculator 14. It flows smoothly from the rapid stirring vessel 14A to the slow stirring vessel 14B via 14C of reduction chambers.

Flocculation device, stirring vessel, magnetic floc, soiling material, magnetic component.

Description

Coagulation Device {FLOCCULATION DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flocculation device, wherein raw water is stirred at a high speed by a rapid stirring tank, and then the raw water is stirred at a low speed by a slow stirring tank. The present invention relates to an agglomeration apparatus for generating magnetic flocs in raw water.

BACKGROUND OF THE INVENTION As a device for removing contaminants present in raw water such as sewage and plant drainage, a contaminated water purification system consisting of a flocculating device and a magnetic separation device has been known. The flocculating device is a magnetic floc which magnetically contains a contaminant by adding a flocculant and a magnetic component in raw water and stirring them, and thus, raw water; ). 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 Document 1 discloses an agglomeration apparatus including a first stirring tank for stirring raw water at high speed and a second stirring tank for stirring raw water at low speed, and generating a magnetic floc in the raw water by such stirring tank.

In this coagulation apparatus, the first stirring tank and the second stirring tank are connected through a pipe, and the raw water is rapidly stirred by the first stirring bath to generate magnetic microflocs of several hundred micrometers in size. The water is fed to the stirring vessel together with the raw water. Then, the raw water is slowly stirred by the second stirring to produce the magnetic microflocs into magnetic flocks of several mm in size.

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.

In addition, since the raw water flowing into the first and second stirring tanks has a free surface, the flocculating device of Patent Document 1 has a free surface, so that the free surface fluctuates in an environment such as a ship, which causes 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 raw water from the first stirring tank flows directly into the second stirring tank, the magnetic flux generated by turbulence in the raw water in the second stirring tank is generated by the turbulence. There was also a concern of destruction.

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 is a rapid process of generating magnetic microflocs in raw water by rapidly stirring raw water containing a magnetic powder and a flocculant by a stirring blade rotating at a first rotational speed. The second step of slowing the raw water flowing out of the stirring tank, the raw water flowing out of the rapid stirring tank at a predetermined flow rate, wherein the polymer flocculant is added to the raw water, and the raw water flowing out of the speed reducing chamber is lower than the first rotational speed. In an agglomeration apparatus having a slow stirring tank which generates a magnetic floc in raw water by stirring at low speed by a stirring blade rotating at a rotational speed, the rapid stirring tank, the reduction chamber, and the slow stirring tank are assembled and integrated into the same casing and are sealed at the same time. It is characterized in that the raw water passes in full water in the rapid stirring tank, the deceleration chamber and the slow stirring tank. It shall be.

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, since the raw water is passed in full water in the rapid stirring tank, the slowing chamber, and the slow stirring tank with the sealed structure of the rapid stirring tank, the slowing chamber, and the slow stirring tank, Free surface). As a result, the raw water flows smoothly in the rapid agitation tank, the deceleration chamber, and the slow agitation tank without turbulence even in an environment such as a ship fluctuation. 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 rotating speed of each stirring blade is that the generated magnetic flocs It is set so that it may become low speed from an upstream side of a raw water to a downstream side so that it may not be destroyed by a flow velocity.

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 raw water so that the generated magnetic flocs were not destroyed by the flow rate of the raw 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 raw water outflow opening formed in the bot dam which divides an upstream tank and a downstream tank so that the speed | rate of the raw water which flows 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 raw water outflow opening formed in the bot bank dividing an upstream tank and a downstream tank is set so that the speed | rate of the raw water which flows into a downstream tank from the same may be set. As a result, the magnetic flocs can be satisfactorily produced in the slow stirring tank.

It is preferable that the rapid stirring tank is airtight and is provided with air and water removal pipes so as not to have a free surface by using raw water in full water. 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 raw 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 raw water in the rapid stirring tank is not affected by the shaking even in the swinging environment. Although the rapid stirring tank of the present invention is a continuous stirring tank in which raw water is continuously supplied, since the internal raw water flow is used in a closed state of full water, the pressure gradient derived from the pump, the internal structure of the rapid stirring tank, and the internal It is determined by the stirring device, and the flow does not depend on the shaking or tilting. That is, the flow of raw water does not change in 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 provide air and a water removal pipe | tube so that it may be closed and it does not have a free surface by using raw 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, since the raw water is passed in full water in the rapid stirring tank, the slowing chamber and the slow stirring tank with the sealed structure of the rapid stirring tank, the slowing chamber and the slow stirring tank, Don't have As a result, the raw water flows smoothly in the rapid agitator, deceleration chamber, and slow agitator even under turbulent conditions such as ships, so that the magnetic microflux and the magnetic floc can be generated satisfactorily. Can be.

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, raw water is sent to the rapid stirring tank 14A of the flocculator 14 by the raw water pump 12. As shown in FIG. In addition, a magnetic powder adding device 16 for adding a magnetic powder to the middle portion of a pipe connecting the raw water pump 12 and the rapid stirring tank 14A, and a flocculant adding device 18 for adding a flocculant are provided. The magnetic powder and the flocculant are installed in the raw 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 where magnetic powder or flocculant is added to the raw water to remove a relatively large dirt of several millimeters by the strainer. .

In the rapid stirring tank 14A, the raw 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 raw water, bacteria, plankton, and the like.

The raw water containing the magnetic microfloc is fed to the slow stirring tank 14B through the slowdown 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. A polymer flocculant is added to raw 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. By stirring the magnetic microflux and the polymer flocculant at low speed by the stirring blade 19, the magnetic flocs F having a size of several hundreds of micrometers to several mm are produced. 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 rotational circumferential speed in the front-end | tip part of the stirring blade 19, the stirring tank A is about 0.5 to 1 m / sec, the stirring tank B is about 0.3 to 0.7 m / sec, and the stirring tank C is It is preferable that it is about 0.1-0.3 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 in order to decelerate the raw 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 flocculating apparatus 14 have air leaked out, and the raw 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 raw water does not fluctuate in the tanks 14A, 14C, and 14B of the flocculator 14. The flow smoothly flows from the rapid stirring tank 14A to the slow stirring tank 14B through the reduction chamber 14C. 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 from the treated water 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 manufactured in a landfill or incinerator or compost. It is conveyed and processed by truck etc. in a factory etc.

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 (filtered 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. have. 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 raw 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, the rapid stirring tank 14A, the deceleration chamber 14C, and the slow stirring tank 14B have a sealed structure, and the raw water is brought into full water in the rapid stirring tank 14A, the reducing chamber 14C, and the slow stirring tank 14B. Since it passed, the raw water does not have a free surface in the rapid stirring tank 14A, the deceleration chamber 14C, and the slow stirring tank 14B. As a result, in the rapid agitation tank 14A, the deceleration chamber 14C, and the slow agitation tank 14B, even in a fluctuating environment such as a ship, the raw water does not become a turbulent flow without laminar flow. 원활) flows smoothly. As a result, the magnetic microflocs and the magnetic flocs F can be produced well.

Moreover, the slow stirring tank 14B of this flocculator 14 is a continuous multistage stirring tank of three steps, and stirring blades 19B, 19B, 19B are provided in each stirring tank A, B, C of the slow stirring tank 14B. ) Is installed. And the rotation speed of each stirring blade 19B, 19B, 19B is set so that it may become low speed from the upstream to the downstream side of raw water so that the magnetic flux F produced | generated as mentioned above may not be destroyed by the flow rate of raw water. 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 upstream so that the circumferential speed (about 0.5-1 m / sec) of the stirring blade 19 of the upstream stirring tank A and the speed of the raw water which flows out from this stirring tank A into the downstream stirring tank B become equal. The size of the raw water outflow opening 48A formed in the bot dam 48 which divides the side stirring tank A and the downstream stirring tank B is set. Similarly, the upstream so that 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 raw water which flows out from this stirring tank B into the downstream stirring tank C become equal. The size of 50 A of raw water outflow openings formed in the bot dam 50 which divides the side stirring tank B and the downstream stirring tank C is set. And stirring so that the circumferential speed (about 0.1-0.3 m / sec) of the stirring blade 19 of the stirring tank C and the speed | rate of the raw water which flows out from this stirring tank C to the downstream magnetic separation apparatus 20 may become the same. The size of the opening part 52A for raw water outflow which formed the tank C and the magnetic separation apparatus 20 in the one wall surface 52 of the flocculation apparatus 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.

Also, in the flocculator 14, raw water flows rapidly from the circular opening 54A formed in the other wall 54 of the flocculator 14 into the rapid stirring vessel 14A and rotates in the counterclockwise direction in FIG. It is stirred at high speed by the stirring blade 19A of the stirring tank 14A. And this raw water enters into the labyrinth-type deceleration chamber 14C which consists of three bot dams 42, 43, and 44 from the circular opening 42A formed in the bot dam 42, and is inside the deceleration chamber 14C. The speed is slowed down. The decelerated raw water flows into the stirring tank A of the slow stirring tank 14B from the opening 44A for raw water discharge formed in the lower right side of the bot dam 44. At this time, the size of the raw water outflow opening 44A is set so that the speed of the raw water flowing into the stirring tank A and the speed of the raw water flowing through the stirring tank A become the same. And raw water flowing into the stirring tank (A) is stirred at a low speed by the stirring blade (19B) of the stirring tank (A) rotated in the clockwise direction in Figure 3 openings for raw water outflow formed on the upper right of the bot dam 48 It flows into the stirring tank B from 48A. And the raw water flowing into the stirring tank (B) is stirred at a low speed by the stirring blade (19B) of the stirring tank (B) rotated in the clockwise direction in Figure 3 openings for raw water outflow formed in the lower portion of the bot (50) ( It flows into the stirring tank C from 50A). Since the raw water flowing into the stirring tank (C) is stirred at a low speed by the stirring blade (19B) of the stirring tank (C) rotated in the counterclockwise rotation on Figure 3, the opening for raw water outflow formed on the top of the wall (52) It flows into the magnetic separation apparatus 20 from 52A.

Moreover, since the flow velocity of raw water is set so that it may become slow as it goes to the downstream side from the upstream of raw water, the size of the opening part 44A, 48A, 50A for the raw water outflow mentioned above will open | release an opening area as it goes to the downstream side from the upstream of raw water. Is set to become large.

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. The arrows in FIGS. 4 to 6 show the inflow direction, the outflow direction, and the rotation direction of the stirring blades of raw water, respectively.

4-6, the same code | symbol is attached | subjected about the part same or similar to the flocculation apparatus 14 shown in FIG. 3, and the description is abbreviate | omitted here. In addition, in the flocculation device 15C of FIG. 6, a bot dam 49 is installed to guide the raw water flowing out from the raw water discharge opening 48A to the upper portion of the tank, and the raw water is placed on the upper portion of the bot dam 49. It flows out from the formed raw water outflow opening 49A to the next tank.

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: raw 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)

Rapid stirring of the raw water containing the magnetic component and the flocculant by rapid stirring by means of a stirring blade rotating at a first rotational speed, thereby producing a magnetic microfloc in the raw water. A second rotation in which the raw water flowing out of the tank and the rapid stirring tank is decelerated at a predetermined flow rate, wherein the deceleration chamber in which the polymer flocculant is added to the raw water and the raw water flowing out of the deceleration chamber are slower than the first rotational speed; In the flocculation apparatus provided with the slow stirring tank which produces a magnetic floc in raw water by stirring at low speed by the stirring blade which rotates at a speed | rate, 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 raw water passes through the water in the rapid agitator, deceleration chamber, and slow agitator. According to claim 1, wherein the slow stirring tank is a multi-stage stirring tank in which a plurality of stages are continuous, each stirring tank is provided with a stirring blade, the rotation speed of each stirring blade is so that the magnetic flux generated is not destroyed by the flow rate of raw water An agglomeration apparatus, characterized in that set at a low speed from an upstream side to a downstream side of raw water. The said multistage agitator tank flows out into the downstream tank from the circumferential speed of the stirring blade of an upstream tank, and its upstream tank, while the adjacent tank is divided by the bot duct. An agglomeration apparatus, characterized in that the size of an opening for outflow of raw water formed in the bot dam dividing the upstream and downstream tanks is set such that the speed of the raw water is the same.

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