KR20090033801A - Magnetic separation apparatus - Google Patents

Abstract

A magnetic separation apparatus is provided to remove magnetic flocks contained in original water by solving problems of adsorption separation efficiency and recovery efficiency included in a conventional magnetic separation apparatus. A magnetic separation apparatus comprises the followings: a plurality of magnetic discs(36); a water supply hole(44) formed on a lower part of a separation tub with a half-submerged state in original water; a classifying member classifying the supplied original water from a supply hole to a left and right and a thickness directions of a surface of the magnetic disc; and a pair of trough(40) in which processed water overflows.

Description

Magnetic Separation Device {MAGNETIC SEPARATION APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic separation device, and more particularly, to a technique for adsorbing magnetic flocks in raw water onto a magnetic disk to separate and remove them from raw water.

As a device for removing contaminants present in raw water, such as sewage and plant drainage, there is a magnetic separation device. This magnetic separation device forms flocculants into magnetic flocks having magnetic properties by adding flocculants and magnetic components in raw water, and the magnetic flocs F are adsorbed and separated on the magnetic disk where magnets are disposed. It is called the magnetic seed method by removing.

Patent Literature 1 discloses a solid-liquid separation device incorporating a magnetic separation device. As shown in Patent Literature 1, the magnetic separator is a plurality of magnetic disks having magnets attached to them in a separation tank at a spaced interval on a rotating shaft. It adsorb | sucks to and removes and collect | recovers in raw water.

Patent Document 1: Patent Publication No. 10-244424

Nevertheless, the conventional magnetic separation device cannot be said to have sufficient ability to remove magnetic flocs from raw water in the following points.

(1) Evenly contacting a plurality of magnetic disks with raw water supplied into the separation tank is important for efficiently removing magnetic flocs in the raw water. However, in the conventional magnetic separation device, the water flow in the separation tank is easy to be biased.

(2) In the case of the configuration in which the magnetic flocs are approximately half-molar in the raw water in the separation tank, the magnetic flocs adsorbed to the magnetic disk are easily peeled off in the raw water, and are conveyed in the air from the raw water by rotation of the magnetic disk. At this point of time, it dries, making it difficult to stick to the magnetic disk. Conventional magnetic separators cannot be said to have sufficient countermeasures against the problem that the magnetic flocks once adsorbed to the magnetic disk in raw water and the measures for efficiently recovering the adsorbed magnetic flocs from the air.

The present invention has been made in view of the above circumstances, and has solved the problems of the adsorptive separation efficiency and recovery efficiency of the magnetic flocs of the conventional magnetic separation device, thereby providing a magnetic separation device capable of removing magnetic flux contained in raw water with high performance. It aims to provide.

In order to achieve the above object, the invention described in claim 1 includes a separation tank into which raw water containing magnetic flocks flows, and excretion in the separation tank. A magnetic separation device having a plurality of magnetic disks installed at predetermined rotational intervals at predetermined intervals to adsorb the magnetic flocks by magnetic force, and recovery means for recovering the adsorbed magnetic flocs. The plurality of magnetic disks are arranged so that the plurality of magnetic disks are approximately half a mole in the raw water of the separation tank, and the raw water is supplied as an upward flow into the separation tank from the water supply port formed at the lower end of the separation tank. (Iii) Immediately below each magnetic disk, a classification member for dividing the raw water supplied from the water supply port into the left and right directions of the magnetic disk surface and the thickness direction of the magnetic disk is disposed. A pair of troughs are provided on both sides parallel to the rotary shaft of the separation tank, in which a pair of troughs are provided to flow the treated water from which magnetic flux in raw water is removed by the magnetic disk. to provide.

According to claim 1, the raw water supplied from the water supply port formed at the lower end of the separation tank collides with the dividing member and is divided into the left and right diameter directions of the magnetic disk and the thickness direction of the magnetic disk. As a result, the raw water supplied from the water supply port collides with the sorting member and flows in the left and right direction and the thickness direction of the magnetic disk so that the flow rate of the raw water flowing between the magnetic disks is decelerated, and the upstream flows slowly between the magnetic disks. To rise. As a result, the magnetic flocs in the raw water can be efficiently adsorbed onto the magnetic disk.

In addition, a pair of troughs are provided on both sides parallel to the rotary shaft of the separation tank in which the magnetic water in the raw water is removed by the magnetic disk, so that the classified flow does not remain in the separation tank. Can be quickly discharged out of the separator.

In addition, by placing the sorting member directly under the magnetic disk, it is possible to prevent the raw water from flowing near the surface of the magnetic disk because of the high velocity of the flow of the raw water. There is nothing to dry.

Claim 2 is characterized in that the separating member is formed in a wedge shape in which the thickness of the upper surface is equal to the thickness of the magnetic disk and at the same time the thickness of the separating member becomes thinner as it goes to the lower end.

By forming the shape of the sorting member as defined in claim 2, the raw water fed from the water supply port can be accurately sorted in the radial direction left and right and in the thickness direction of the magnetic disk.

Claim 3 is a water supply port of Claim 1 or 2 WHEREIN: It is characterized by the fact that it is formed in the square cylinder shape long in the said rotating shaft direction.

As defined in claim 3, the water supply port is formed in a rectangular cylindrical shape long in the rotational axis direction, so that the water supply port can be easily supplied evenly into the separation tank, and the magnetic floc removal performance can be further improved.

The method according to any one of claims 1 to 3, wherein the base end is fixed to the inner surface of the separation tank between the outer peripheral surface of the magnetic disk of each of the plurality of sheets and the inner surface of the separation tank, the front end is the outer peripheral surface of the magnetic disk as a free end It is characterized in that the sealing plate in contact with the.

According to claim 4, the sealing plate is disposed between the outer peripheral surface of each of the plurality of magnetic disks and the inner surface of the separation tank to short-circuit the outer peripheral surface of the magnetic disk to flow over the trough without contacting the magnetic disk surface Since it can prevent, the removal of a magnetic floc can be improved further.

The method according to any one of claims 1 to 4, wherein the recovery means is disposed in the groove through the magnetic disk to the outside of the separation tank between the magnetic disks just before the rotating magnetic disk enters the raw water in the air. Groove edge scraper which scrapes the magnetic flocks adsorbed on the magnetic disk surface by contacting the magnetic disk surface with a predetermined biasing force, and the edge portions of the upper sides of the both sides are disposed in the groove scraper and scraped off so as to scrape off the groove cylindrical scraper. And a conveying means for conveying the magnetic flocks dropped and deposited therein to the outside of the separation tank.

According to claim 5, the rotating magnetic disk is grooved from the vicinity of the rotating shaft to the outside of the separation tank between the magnetic disks just before entering the raw water in the air, so that the edge portions of the upper sides of both sides is a predetermined portion on the magnetic disk surface. By installing a groove-shaped scraper that scrapes the magnetic flocks adsorbed on the magnetic disk surface by contacting with the force, it can be reliably scraped even if there is a magnetic floc that is dried in the air and adhered to the magnetic disk surface. The floc can be reliably recovered into the trough scraper.

As described above, according to the magnetic separation device of the present invention, the problem of adsorptive separation efficiency and recovery efficiency of the magnetic flocs with the conventional magnetic separation device can be solved, and the magnetic flocs contained in the raw water can be removed with high performance.

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

FIG. 1 is a block diagram illustrating a flow of assembling the magnetic separation device 20 of the present invention into a 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.

As shown in FIG. 1, in the wastewater purification system 10, raw water is first fed to the rapid stirring tank 14A of the flocculator 14 by the raw water pump 12. In addition, a magnetic powder adding device 16 for adding a magnetic powder and a flocculant adding device 18 for adding a coagulant are provided in the middle of the piping connecting the raw water pump 12 and the rapid stirring tank 14A. And a flocculant is added to the raw water flowing in the pipe. As a magnetic component, for example, iron tetraoxide can be preferably used. As the coagulant, a water-soluble inorganic coagulant such as polyaluminum chloride, iron chloride, ferric sulfate can be preferably used. Although not shown, it is preferable to filter a relatively large dirt of several mm in size by installing a strainer before adding magnetic powder or flocculant to raw water.

In the rapid agitation tank 14A, by stirring the raw water, the added magnetic component and the coagulant rapidly with the stirring blade 19 rotating at high speed, a small magnetic flocks (F (also called magnetic microflocs) having a size of several tens of micrometers are formed). . As rotation circumferential speed in the front-end | tip part of the stirring blade 19, it is preferable to carry out about 1-2 m / sec. Magnetic microflocs contain magnetic components, solid suspended particles in raw water, bacteria, plankton, and the like.

Next, the raw water containing the magnetic microflocs is fed to the slow stirring tank 14B of the flocculating device 14. In addition, a polymer flocculant adding device 21 for adding a polymer flocculant in the vicinity of the communication chamber 14C connecting the rapid stirring tank 14A and the slow stirring tank 14B is provided to communicate the chamber 14C. A polymeric flocculant is added to the raw water which flows through. As the polymer flocculant, anionic and nonionic types can be suitably used.

The slow stirring tank 14B forms the magnetic flocks F having a size of several hundreds of micrometers to several mm by stirring the magnetic microflux and the polymer flocculant at low speed with the stirring blade 19 rotating at low speed. As shown in FIG. 2, it is preferable that the slow stirring tank 14B is comprised by the continuous multistage stirring tank A, B, C of multiple stages. In this case, it is set so that the rotation speed of the stirring blade 19 may become low speed as it goes to the slow stirring tank C of a downstream from the slow stirring tank A of an upstream. As a result, as the magnetic flux F grows as it goes from the upstream slow stirring tank A to the downstream slow stirring tank C, it is possible to prevent the magnetic flux F that is grown. For example, as a rotational circumferential speed in the front-end | tip part of the stirring blade 19, a slow stirring tank A is about 0.5-1 m / sec, a slow stirring tank B is about 0.3-0.7 m / sec, a slow stirring tank It is preferable that (C) is about 0.1-0.3 m / sec.

As shown in Fig. 2, the agglomeration apparatus 14 preferably constitutes a rapid stirring tank 14A, a communication chamber 14C, and a slow stirring tank 14B as an integrated structure device, but each may be connected by a pipe. .

The raw water containing the magnetic flocs F having the increased size is sent to the magnetic separation device 20 of the present invention. The magnetic separation device 20 adsorbs and separates the magnetic flocs F in the raw water by magnetic force, and about 90% of the magnetic flocs F in the raw water is separated and removed by the magnetic separation device 20. The configuration of the magnetic separation device 20 will be described in detail after explaining the entire flow of the wastewater purification system 10.

The magnetic flocs F removed from the magnetic separation device 20 are reduced to about 80% moisture content by a dehydration device 25 such as a centrifuge or a belt press, and then a landfill or incinerator or a compost manufacturing plant by a truck or the like. Is sent to the back.

On the other hand, the treated water treated by the magnetic separator 20 is then sent to the filter separator 24. In the filter separating apparatus 24, the treated water is filtered from the inside of the rotating drum filter 26 to the magnetic flux F remaining in the treated water.

As a result, it is possible to purify raw water containing contaminants such as dirt, solid suspended particles, bacteria, and plankton. The magnetic flocks F attached to the rotary drum filter 26 are flushed with the washing water from a showering device 28 disposed above the rotary drum filter 26 so that the rotary drum filter 26 is showered. In the hopper and discharged out of the device. In this case, a part of the treated water purified by the rotary drum filter 26 may be returned to the showering device 28 by the circulation pump 29 and reused as the washing water. In addition, the dirty cleaning drainage including the magnetic flop F by the shower ring is returned to the front end of the raw water pump 12 by the pump 30.

[Magnetic separation device]

3 is a perspective view showing a part of the present invention magnetic separator 20 in cross section, Figure 4 is a side cross-sectional view, Figure 5 is a front cross-sectional view.

As shown in these drawings, the magnetic separation device 20 of the present invention mainly comprises a separation tank 32 into which raw water containing a magnetic flop F flows, and a rotating shaft disposed horizontally in the separation tank 32. Recovery means for recovering the magnetic disks (F) adsorbed on the magnetic disks (36) and the plurality of magnetic disks (36) adjoining the magnetic disks (F) by magnetic force, which are arranged at a predetermined interval on the (34). It consists of 38. In addition, although the form of this embodiment demonstrates three or four magnetic disks 36 as an example, it is not limited to the number of sheets.

Separation tank 32 is formed in a semi-cylindrical shape in which an upper surface is opened and both end surfaces are closed by side walls 41 (see Fig. 5). On both sides (left and right in FIG. 3) of the separating tank 32, a pair of troughs 40 (troughs) of a cross-sectional concave shape formed in parallel with the rotating shaft 34 are integrally formed with the separating tank 32. On the outside of the trough 40, the floc recovery tank 42 of the cross-sectional concave shape parallel to the trough 40 is provided. In addition, the floc recovery tank 42 is provided in the right side (right side of FIG. 3) which the rotating magnetic disk 36 enters in raw water, as shown in FIG.

In addition, as shown in FIG. 5, the upper side of the pair of side walls 41 of the separating tank 32 is rotatably supported by the rotating shaft 34 through the bearing 35, and one end of the rotating shaft 34 is supported by the motor 39. Connected. A plurality of magnetic disks 36 having insertion holes in the center thereof are inserted and supported at the rotation shaft 34 at predetermined intervals. A sleeve 31 is provided between the magnetic disks 36 to adjust the distance between the magnetic disks 36 and to fix the inner circumference of the magnetic disk 36. It is preferable to set the space | interval of the magnetic disks 36 comrades to 1 to 3 times the thickness of the magnetic disk 36. As shown in FIG. If the spacing is less than one time, the raw water flows between the magnetic disks 36 and at the same time, if it is over three times too wide, it is difficult to generate a strong magnetic force between the magnetic disks 36.

In addition, it is preferable that the plurality of magnetic disks 36 supported by the rotating shaft 34 be submerged in the ratio of 1/2 to 2/3 in the raw water in the separation tank 32. In the case where the magnetic disk 36 is partially submerged as described above, the magnetic disk 36 is rotated by the magnetic disk F rotated by the magnetic disk F adsorbed to the magnetic disk 36 in raw water, and the magnetic disk F is conveyed to the air. At this time, the recovery means 38 recovers the water. Therefore, it is important to set the water mole ratio of the magnetic disk 36 so that the efficiency of adsorption and recovery of the magnetic flocs F is the best. For this reason, for example, a pair of bearings 35 rotatably supporting the rotating shaft 34 are supported by a pair of lifting apparatuses (not shown), and the magnetic disk 36 is lifted and lifted by a hydraulic mechanism or the like, thereby varying the water-removal rate. It's a good idea to configure it so that you can.

In addition, at the lower end of the separation tank 32, a water supply port 44 having a long rectangular cylinder shape in the axial direction of the rotary shaft 34 is formed, and the outlet of the water supply port 44 and the coagulation device 14 is a rectangular tubular pipe ( 43; see FIG. 4). The water supply port 44 is provided with a plurality of sorting members 46 (see FIG. 5). As shown in Fig. 5, this sorting member 46 is disposed directly under each magnetic disk 36 so that the thickness W1 of the upper surface is formed to be equal to the thickness W2 of the magnetic disk 36. It is formed in the shape of a cross-sectional wedge that becomes thin at the bottom of the persimmon. Also, as can be seen from FIG. 4, the width dimension D1 of the sorting member 46 is smaller than the width D2 of the feed port 44 so that the raw water supplied to the feed port 44 is provided with the water supply port 44 and the sorting member ( It is comprised so that it may be divided into the clearance gaps 44A and 44B formed between 46.

The raw water supplied from the water supply port 44 by the dividing member 46 collides with the dividing member 46 and is divided into the left and right in the radial direction of the magnetic disk 36 as shown in FIG. 4. In this way, the raw water supplied from the water supply port 44 collides with the dividing member 46 and is classified as two flows in the left and right directions, so that the flow rate of the raw water flowing between the magnetic disks 36 is reduced and the magnetic disk 36 is discharged. It becomes the upward flow which flows slowly between each other, and rises. Thereby, the magnetic flocks F in the raw water can be efficiently adsorbed to the magnetic disk 36. In addition, the magnetic flux F once adsorbed to the magnetic disk 36 becomes difficult to peel off by slowing down the flow velocity of the upstream.

In addition, the raw water which flowed into the separation tank 32 from the water supply port 44 by the sorting member 46 is also classified in the thickness direction of the magnetic disk 36 as shown in FIG. As a result, the magnetic flocks F adsorbed onto the magnetic disk 36 can be prevented from peeling off due to the water flow of the raw water supplied from the water supply port 44. That is, as can be seen from FIG. 5, if the wedge-shaped dividing member 46 is not provided, the outer circumferential surface 36a of the magnetic disk 36 is directly exposed to the upward flow of raw water supplied from the water supply port 44. .

That is, as shown in Fig. 6, the flow of raw water in the absence of the dividing member 46 becomes a fast upward flow of the flow rate so as to appear as a dotted line, and flows near the surface of the magnetic disk 36, so that the magnetic flux F Among the magnetic flocks F adsorbed on the surface, the magnetic flocs F, particularly close to the outer circumferential surface 36a, are scraped off by the flow of raw water and fall out in the raw water. On the other hand, the raw water flowing in from the water supply port 44 by the dividing member 46 is not directly exposed to the flow of raw water by the dividing member 46, as indicated by the solid line in FIG. 5. Corresponding to (46), the flow velocity is slowed down and further classified into the thickness direction of the magnetic disk 36. Accordingly, the magnetic flop F once adsorbed to the magnetic disk surface is not scraped off by the flow of raw water.

In addition, as shown in FIG. 4, the separation tank 32 seals a gap between the outer circumferential surface 36a of the magnetic disk 36 and the inner surface of the separation tank 32 to feed water from the water supply port 44. A sealing plate 48 is provided for shorting the outer circumferential surface 36a of the magnetic disk 36 so as not to flow out into the trough 40.

As shown in FIG. 7, the sealing plate 48 is fixed to the rotation shaft 50 whose proximal end is rotatably supported by the separating tank 32, and at the same time, the distal end is provided on the outer peripheral surface 36a of the magnetic disk 36 as a free end. In contact. And the rotation shaft 50 is rotated in the arrow direction by the spring etc. which are not shown in figure. Accordingly, since the sealing plate 48 abuts against the outer circumferential surface 36a of the magnetic disk 36 with a predetermined contact force, the sealing plate 48 does not inhibit rotation of the magnetic disk, and thus the raw water short-passes the outer circumferential surface 36a of the magnetic disk 36. (shorter route) can be prevented. As a material of the sealing plate 48, an elastic body softer than the magnetic disk 36 is preferable, and a rubber plate can be used suitably, for example.

Next, the magnetic disk 36 will be described.

The magnetic disk 36 is formed by arranging a ferromagnetic disk substrate 33 fitted to a permanent magnet piece 37 in a case 45 of a nonmagnetic material having a torus-shaped cavity therein. In the center of the disk substrate 33, a hole for inserting the rotary shaft 34 is formed. In addition, three or more magnetic disks 36 are normally disposed on the rotating shaft 34.

For a plurality of magnetic disks 36 to be provided, conventionally, as shown in FIG. 8A, the innermost magnetic disk 36A is disposed at both ends of the rotary shaft 34, and the center of the inner side of both ends of the rotary shaft 34. FIG. Permanent magnet pieces 37 were disposed on both sides of the inner magnetic disk 36B and the ferromagnetic disk substrate 33 disposed close to each other. For this reason, there existed a problem of the magnetic leakage from the outermost magnetic disk 36A to the separation tank 32, and the problem of the deformation of the outermost magnetic disk 36A.

In the case of the inner magnetic disk 36B, since magnetic disks opposing both sides exist, the magnetic force of the inner magnetic disk 36B remains in equilibrium as long as the magnetic disks 36 are arranged at equal intervals, so that magnetic leakage or deformation There is no worry.

As a countermeasure, as shown in FIG. 8 (B), the permanent magnet piece 37 is disposed on both surfaces of the disc substrate 33 as in the conventional case with respect to the inner magnetic disk 36B, and the disc substrate 33 of the ferromagnetic material is replaced with the permanent magnet piece. (37) Make sure that they fit together. On the other hand, for the outermost magnetic disk 36A, the permanent magnet piece 37 for exerting magnetic force is disposed only on the inner side surfaces (side surfaces of the inner magnetic disk 36B) on both sides of the disk substrate 33, and the disk On the outer side surface of the board | substrate 33, the one iron plate 52 was arrange | positioned so that the disk board | substrate 33 may be fitted by the magnet and the iron plate 52. As shown in FIG. In this case, the disk substrate 33 is essentially ferromagnetic, but the iron plate 52 may be ferromagnetic or nonmagnetic. In addition, the disk substrate 33 and the iron plate 52 may be comprised as a single piece by a thick ferromagnetic material. As a result, the rigidity of the outermost magnetic disk 36A is made larger than that of the inner magnetic disk 36B. To increase the rigidity of the disk substrate 33 of the outermost magnetic disk 36A, it is necessary to resist the magnetic force of the inner magnetic disk 36B so that the outermost magnetic disk 36A does not deform. Therefore, what is necessary is just to set the thickness of the iron plate 52 suitably with the distance of the outermost magnetic disk 36A and the inner magnetic disk 36B, the magnetic force of the permanent magnet piece 37, the material of the disk board 33, etc.

In the case of the outermost magnetic disk 36A or the inner magnetic disk 36B, when the disk substrate 33 is made of ferromagnetic material, the permanent magnet piece 37 is directly applied to the disk substrate 33 by magnetic force. Although it is possible to attach, a method of attaching with an adhesive is more preferable. In this case, a structure in which a resin is molded in a space formed inside the case 45 is also possible.

In addition, in order to increase the rigidity of the magnetic disk 36, a pocket portion (not shown) for fitting the permanent magnet piece 37 to the surface of the disk substrate 330 of the ferromagnetic material is attached, and the permanent magnet piece 37 is inserted into the pocket part. You may put it.

In the manufacturing method of the magnetic disk 36 in which a plurality of permanent magnet pieces 37 are fixed to the surface of the disk substrate 33, the pocket of the disk substrate 33 is a plurality of holes in at least one surface of both sides of the substrate 33. A disk substrate forming step of forming a honeycomb structure having a portion, a magnet embedding step of inserting the permanent magnet piece 37 into the pocket portion of the formed disk substrate 33, and a disk into which the permanent magnet piece 37 is inserted. It consists of an accommodating process which accommodates the board | substrate 33 inside the case 45 in which the cavity on the torus was formed inside.

Accordingly, since the side wall of the pocket 56 serves as a rib, rigidity can be increased. In this case, the pocket portion needs to be formed of a nonmagnetic material, and the pocket portion is glued to the disk substrate 33 of the ferromagnetic material. When the pocket portion is formed of a magnetic material (especially a ferromagnetic material), the magnetic flux is absorbed by the side wall of the pocket portion, and as a result, only the magnetic field near the magnet surface becomes strong, and a high magnetic field is generated at a position away from the permanent magnet piece 37 related to the magnetization direction. Because it becomes difficult.

By constructing the outermost magnetic disk 36A in this manner, magnetic leakage can be eliminated without providing a magnetic shield or magnetic coil as a simple countermeasure, and the outermost magnetic disk 36A is not deformed. In addition, in order to produce the inner magnetic disk 36B having the pocket portion, the pocket portion may be formed on both surfaces of the disk substrate 33.

However, since the permanent magnet piece 37 is not disposed on the outer surface of the disk substrate 33 of the outermost magnetic disk 36A, the outer surface of the outermost magnetic disk 36A and the inner surface of the separator 32 are separated. There is a risk that the raw water passed through the trough 40 without the magnetic flux (F) is adsorbed separation. As a countermeasure, as shown in FIG. 5, the gap between the outer surface of the outermost magnetic disk 36A and the inner surface of the separating tank 32 is embedded in the shielding member 54 which does not inhibit the rotation of the outermost magnetic disk 36A. I made it possible. As the shielding member 54, it is necessary not to impede the rotation of the outermost magnetic disk 36A, and a material having a low friction and soft material such as resin or sponge can be suitably used. Accordingly, even if the permanent magnet piece 37 is not disposed on the outer surface of the outermost magnetic disk 36A, the magnetic flop F does not flow out to the trough 40 as it is. As can be seen from FIG. 5, a concave gap is formed between the outer surface of the outermost magnetic disk 36A and the inner surface of the separation tank 32 even when shielded by the shielding member 54, but the outermost magnetic disk 36A is formed. As the centrifugal force acts by rotating, the raw water does not stay in the concave gap.

In order to increase the rigidity of the outermost magnetic disk 36A, there is a method in which the case 45 itself of the magnetic disk 36 has a honeycomb structure. By employing this method, the magnetic disk 36 can be reduced in weight. . This honeycomb structure method is not limited to the outermost magnetic disk 36A, but can also be applied to the inner magnetic disk 36B.

Next, the floc recovering means 38 for recovering the magnetic flocks F adsorbed to the magnetic disk 36 will be described.

The floc recovery means 38 mainly consists of the groove-shaped scraper 60 and the conveyance means 62. As shown in FIG.

The groove-shaped scraper 60 has a floc recovery tank 42 near the rotary shaft 34 between the magnetic disks 36 immediately before the rotating magnetic disks 36 enter the raw water from the air (see FIG. 5). It is excreted in the gutter up to the top of). Then, a magnetic floc adsorbed to the surface of the magnetic disk 36 by contacting the edge portion 60A of the upper surface of the groove-shaped scraper 60 with a predetermined negative force on the surface of the magnetic disk 36. F) is scraped off.

In addition, the conveying means 62 conveys the magnetic flocks F disposed in the groove-shaped scraper 60 and scraped off and dropped and deposited in the groove-shaped scraper 60 to the upper side of the floc recovery tank 42 to supply the floc recovery tank 42. Drop). As the conveying means 62, a screw conveyor 64 or a belt conveyor with a fin can be preferably used. FIGS. 9 to 11 show a screw conveyor 64, and FIGS. 12 and 13 In the case of a belt conveyor 66 with a fin. 9, 10, and 12 show the magnetic flop F only in the air portion of the magnetic disk 36. As shown in FIG.

As shown in Fig. 9, the groove-shaped scraper 60 contacts the upper edge portion 60A of the side with a predetermined pressing force on the surface of the magnetic disk 36 and at the same time the upper edge portion 60A. ) Is formed in a sharp thin shape. As a result, the magnetic flocks F adsorbed on the surface of the magnetic disk 36 rotating in the clockwise direction are scraped off by the upper edge portion 60A of the groove-shaped scraper 60 and fall into the groove-shaped scraper 60.

As shown in FIGS. 9-11, 64 A of screw parts of the screw conveyor 64 are accommodated in the groove-shaped scraper 60, and one end of the screw part 64A is connected to the motor 64B. In this case, as shown in FIG. 11, it is preferable that the inner surface shape from the side surface of the groove-shaped scraper 60 to a bottom surface is made semi-circular so that the dead space of conveyance may not be formed. Thereby, the magnetic flocks F dropped and deposited in the groove-shaped scraper 60 are conveyed to the upper side of the floc recovery tank 42 by the screw conveyor 64, and fall to the floc recovery tank 42. FIG.

In addition, when the pin belt conveyor 66 with a fin is employ | adopted as the conveying means 62, it is comprised as shown in FIG. 12, FIG. That is, the pin conveyor belt conveyor 66 has a pair of pulleys 68 disposed on both sides of the magnetic disk 36 in the radial direction, and has a fin 69 between the pair of pulleys. An endless belt 70 can be wound up. In addition, one of the pair of pulleys 68 is connected to a driving means such as a motor (not shown). This endless belt 70 does not contact the surface of the magnetic disk 36. Fins (69) are arranged on the outer surface of the endless belt (70) at predetermined intervals are formed perpendicular to the endless belt (70). In this case, as shown in FIG. 13, it is preferable that the inner surface shape which reaches the bottom face from the side surface of the groove | channel cylindrical scraper 60 matches with the shape of the fin 69 so that the dead space of conveyance may not be formed. For example, when the fin 69 has an inverted trapezoidal shape, the inner surface shape of the groove-shaped scraper 60 is also inverted trapezoidal.

In addition, although the support structure of the groove-shaped scraper 60 and the support structure of the pulley 68 of the pinned belt conveyor 66 are not specifically shown in FIGS. 9-13, it is supported by the apparatus main body of the magnetic separation apparatus 20, for example. Can be. In addition, the inclination of the groove-shaped scraper 60 shows that the right side is inclined upward in FIG. 10 (screw conveyor), while in FIG. 12 (belt conveyor with pins), the right side is inclined downward, but the right side is inclined upward. It is more preferable. This is because the water in the magnetic flocks flows through the gutter-shaped scraper 60 while the magnetic volume F having the drop volume in the gutter-shaped scraper 60 is conveyed to the conveying means 62, but the right side is tilted upward. By doing so, it is possible to prevent the water from flowing into the floc recovery tank 42. It is important to reduce the volume by making the magnetic flocs F collected in the floc recovery tank 42 as low as possible. For this reason, it is preferable to provide adjustment means (not shown) which adjusts the inclination of the whole recovery means 38 so that the inclination of the upper inclination of the groove-shaped scraper 60 can be adjusted. For example, in the case of the recovery means 38 of the screw conveyor system, the longitudinal center portion of the groove-shaped scraper 60 is supported by the rotational shaft so that the groove-shaped scraper 60 is supported by an expansion and contraction device such as a cylinder device like a seesaw. It can also be configured to be swingable.

Next, the operation of the magnetic separation device 20 configured as described above will be described.

The raw water containing the magnetic flocks F flows in from the water supply port 44 formed at the lower end of the separation tank 32 and is separated by the dividing member 46. By this sorting member 46, raw water is sorted into both the left and right sides with respect to the surface of the magnetic disk 36 which rotates continuously, and is classed so that it may flow into the ferromagnetic space between the magnetic disks 36 comrades. As the sorted raw water rises in the separation tank 32, the magnetic flocs F in the raw water are adsorbed on the surface of the magnetic disk 36. The treated water purified by the magnetic flop F is suspended in a pair of troughs 40 (troughs) installed on both left and right sides of the magnetic flop F.

On the other hand, the magnetic flocks F adsorbed on the magnetic disk 36 are conveyed to the atmosphere on the water surface by the continuous rotation of the magnetic disk 36 and exposed to the atmosphere. As the magnetic flocs F are exposed to the air, moisture of the magnetic flocs F flows down the surface of the magnetic disk 36 by gravity and falls into the separation tank 32. Moreover, the magnetic flocks F adsorbed on the magnetic disk 36 are consolidated by the magnetic force of the magnetic disk 36. As a result, dehydration of the magnetic flocks F is promoted, and the water content becomes sludge of about 90%.

Dehydration-promoted magnetic flocs F are conveyed to the position of the groove-shaped scraper 60 by the continuous rotation of the magnetic disk 36, scraped off by the side edge portion 60A of the groove-shaped scraper 60, and thus the groove-shaped scraper. It falls within 60. The magnetic flocks F dropped into the gutter scraper 60 are conveyed by the conveying means 62 of the screw conveyor 64 or the belt conveyor with pins 66 and conveyed to the upper side of the floc recovery tank 42 and the flocks. It falls to the recovery tank 42.

In the magnetic separation of the magnetic flocks F by the magnetic separation device 20 provided, the sorting member 46 is provided directly under the plurality of magnetic discs 36, so that the magnetic flocks F in the raw water are removed from the magnetic discs. It can adsorb | suck to 36 efficiently.

Further, by installing the sealing plate 48 between the magnetic disk and the separation tank, the raw material short-circuits the outer circumferential surface of the magnetic disk 36 on which magnetic force is not exerted, so that it overflows through the trough 40 (trough). Can be done. As a result, the water quality of the treated water flowing into the trough 40 does not deteriorate.

In addition, the inner magnetic disk 36B among the plurality of magnetic disks 36 disposed on the rotating shaft 34 is conventionally arranged with permanent magnet pieces 37 on both sides of the disk substrate 33, while the outermost magnetic disk ( For 36A), permanent magnet pieces 37 for exerting magnetic force only on the inner surface (side surface of the inner magnetic disk) of the disk substrate 33 were disposed. Then, the rigidity of the disk substrate 33 for disposing the permanent magnet pieces of the outermost magnetic disk 36A is made larger than that of the disk substrate of the inner magnetic disk. In this case, by adopting the honeycomb magnetic disk 36, it is possible to reduce the weight while securing the necessary rigidity.

In addition, the shielding member 54 was embedded between the outer surface of the outermost magnetic disk 36A and the inner surface of the separation tank 32. As a result, magnetic leakage and deformation from the outermost magnetic disk 36A can be prevented, and raw water passes through the outer surface of the outermost magnetic disk 36A so as not to overflow into the trough 40 (trough). Therefore, the quality of the treated water does not deteriorate.

In addition, by providing the groove-shaped scraper 60 as the recovery means 38, the magnetic flocks F adsorbed to the magnetic disk 36 can be reliably recovered.

1 is a block diagram showing a flow of a filthy water purification system incorporating the present invention magnetic separator;

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

3 is a perspective view showing a part of the present invention magnetic separator in cross section,

4 is a side cross-sectional view of the magnetic separator of the present invention;

5 is a front cross-sectional view of the magnetic separator of the present invention;

6 is an explanatory diagram for explaining the action of the sorting member provided in the present invention magnetic separator;

7 is a perspective view illustrating a sealing plate installed in the magnetic separator of the present invention;

8 is an explanatory diagram illustrating a difference between the outermost magnetic disk in the prior art and the present invention;

9 is an explanatory diagram illustrating a relationship between a magnetic device and a groove scraper of the magnetic separation device of the present invention;

10 is an explanatory view for explaining recovery means of a screw conveyer system;

11 is an explanatory diagram illustrating a relationship between a screw conveyer and a groove-shaped scraper;

12 is an explanatory diagram illustrating a recovery means of a belt conveyor system with a pin;

It is explanatory drawing explaining the relationship between the pin of the belt conveyor system with a pin, and a groove-shaped scraper.

<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 16: magnetic component adding device

18: flocculant addition device 19: stirring blade

20: magnetic separator 24: filter separator

25: dewatering device 26: rotary drum filter

28: showering device 29: circulation pump

30 pump 31 sleeve

32: separation tank 33: disk substrate

34: rotating shaft 35: bearing

36: magnetic disk 37: permanent magnet piece

38: recovery means 39: motor

40: trough 41: side wall

42: floc recovery tank 43: square cylindrical pipe

44: water outlet 45: case

46: classification member 48: sealing plate

50: rotating shaft 52: reinforcing member

55: lid member 60: gutter tube scraper

62: conveying means 64: screw conveyor

66: belt conveyor with pin 68: pulley

69: pin 70: endless belt

F: Magnetic Flux

Claims (5)

The separation tank into which the raw water containing magnetic flocks flows, and the rotating shaft installed in the separation tank are installed at predetermined intervals. A magnetic separation device comprising a plurality of magnetic disks for adsorbing the magnetic flocks by magnetic force and recovery means for recovering the adsorbed magnetic flocs, wherein the plurality of magnetic disks are raw water of the separation tank. The raw water is supplied as an upward flow into the separation tank from the water supply port formed at the lower end of the separation tank, and immediately below the magnetic disk of each of the plurality of sheets. A sorting member is provided for dividing the raw water supplied from the water supply port in the left and right directions of the magnetic disk surface and in the thickness direction of the magnetic disk, and is disposed on both sides parallel to the rotating shaft of the separation tank. Magnetic separation device that the trough (trough) of the pair of magnetic flux to be processed is removed in the raw water overflow (越 流) by the magnetic disk are characterized. The magnetic separation device according to claim 1, wherein the sorting member is formed in a wedge shape in which the thickness of the upper end surface is equal to the thickness of the magnetic disk and the thickness becomes thinner as it goes to the lower end. 3. The magnetic separation device according to claim 1 or 2, wherein the water supply port is formed in a shape of a rectangular cylinder elongated in the rotation axis direction. The base end portion is fixed to the separation tank inner surface between the outer circumferential surface of each of the plurality of magnetic disks and the inner surface of the separation tank, and the leading end is a free end of the magnetic disk according to any one of claims 1 to 3. A magnetic separator comprising a sealing plate in contact with an outer circumferential surface thereof. 5. The collecting means according to any one of claims 1 to 4, wherein the recovery means is provided in a groove shape from the vicinity of the rotating shaft to the outside of the separation tank between the magnetic disks just before the rotating magnetic disk enters the raw water in the air. A groove scraper that is disposed and contacts the magnetic disk surface by scraping the edges of the upper ends of both sides with a predetermined force on the magnetic disk surface; And a conveying means for conveying the magnetic flops dropped and deposited in the scraper to the outside of the separating tank.

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