JP4821085B2 - Magnetic separation and purification apparatus and magnetic separation and purification method - Google Patents

Description

  The present invention relates to a magnetic separation and purification apparatus for the purpose of water purification and solid-liquid separation, and more particularly, the magnetic separation of a magnetic substance by a membrane and the magnetic separation of the captured substance are favorably magnetized against fluctuations in the water surface of the magnetic separation unit. The present invention relates to a structure of a magnetic separation and purification device that can separate substances and stably discharge high-density sludge.

  For the purpose of solid-liquid separation, etc., it is used as a water separation membrane through a fine wire mesh, a net woven with polymer fibers, or a membrane, and a flocculant and magnetic powder are added to the raw water with contaminated particles (called sludge). There is a magnetic separation and purification device that generates magnetic flocs, separates the magnetic flocs with a film, and magnetically separates and removes the magnetic flocs collected by the film to recover high-concentration sludge. This structure is described in Patent Document 1, for example. This membrane separation and purification apparatus is constituted by a stainless steel fine wire, polyester fiber, or the like, and has, for example, an opening with an opening of several tens of micrometers. In order to separate fine pollutants smaller than the projected area and projected diameter of the opening, the raw water is mixed with, for example, coagulant vanous acid sulfate, polyaluminum chloride, polyiron sulfate and magnetic powder, A magnetic floc is formed by binding a small solid suspension of algae, algae, fungi, and microorganisms to a size of about several hundred microns with a condensing agent. This magnetic floc cannot pass through an opening having an opening of several tens of micrometers, and is captured and separated at a high removal rate. Water that has permeated the membrane becomes purified water with higher water quality.

After the magnetic flocs collected on the membrane are washed away from the membrane with washing water, the magnetic flocs that remain in the vicinity of the water surface are magnetically separated by being attracted by the magnetic force of a magnet that is stationaryly placed near the water surface, It is transferred to the sludge collection tank by the sludge transfer means and eliminated.
Ultimately, the sludge is usually transported to a disposal site or incinerator by a truck or composted.

  In Patent Document 2, in the sewage treatment apparatus that adsorbs and separates magnetic particles in the sewage flowing into the sewage treatment tank from the sewage with a magnetic plate disposed in the sewage treatment tank and discharges it outside the sewage treatment tank, A sewage treatment tank having a sewage inlet at the bottom and a treated water discharge outlet at the top, and a submersion in the sewage in the sewage treatment tank, and being mounted in parallel with a predetermined interval on the rotating shaft. A plurality of disk-like magnetic bodies that are suspended, and a plurality of permanent magnet pieces that are disposed on the surface of each of the disk-like magnetic bodies and that are arranged so that the opposing magnetic poles are opposite to each other between the opposing disk-like magnetic bodies. And a scraping device that comprises an endless belt with a scraper, circulates and scrapes the sludge adsorbed on the surface of the permanent magnet deformation, and moves the scraped sludge above the disk-shaped magnetic body, When installed in the sewage of the sewage treatment tank Further, a sludge discharge passage that surrounds the scraping device and guides the sludge scraped by the scraper to a sludge discharge port, and is formed in communication with the sludge discharge passage, and the treated water in the sludge discharge passage overflows. A sewage treatment device is described which comprises an overflow outlet.

  Japanese Patent Application Laid-Open No. 2003-228688 discloses a magnetic separation apparatus having a structure in which an inner cylinder in which a magnet is arranged at a required position on the outer peripheral surface is built in a rotating drum made of a nonmagnetic agent, and a squeezing roller and a scraper that come into contact with the rotating drum are provided. A rotary drum type magnetic separation device is described in which the entire surface or a required portion of the rotary drum is made magnetic at a required depth.

JP 2002-273261 A Japanese Patent No. 3228430 JP 2000-79353 A

  As described above, in the conventional example, the magnetic flocs washed away from the film and staying in the vicinity of the water surface are magnetically attracted by the stationary magnetic field distribution of the stationary magnet. When the force is at a weak position, the removal performance of a large number of magnetic flocs existing in the vicinity of the water surface is lowered, the magnetic floc density in the water to be treated is increased, the purification rate by the membrane is lowered, and the purification performance is reduced.

  On the other hand, when sludge is transported to a disposal site or incineration site by truck or composted, the water content is about 85% so that water does not leak from the sludge during transportation, and the activity of microorganisms that decompose organic matter during composting In order to reduce the moisture content of the sludge, the moisture content must be reduced to 75% before transportation and composting.

  Here, when the purification rate by the membrane decreases and the surface of the water to be treated rises, the water to be treated having magnetic flocs is magnetically separated, removed, and recovered by using magnetic flocs adjacent to the water tank to be filtered as high-concentration sludge. When the water to be treated overflows into the sludge collection tank, the sludge recovered at a high concentration drastically dilutes with the water to be treated, the sludge becomes low in concentration, the sludge volume increases significantly, and the moisture content is reduced. There is a problem that dehydration costs increase.

An object of the present invention is to provide a magnetic separation and purification device capable of separating magnetic flocs containing magnetic substances satisfactorily and stably discharging high-density sludge against fluctuations in the water surface of the magnetic separation unit. .
Moreover, this invention prevents that the sludge collect | recovered by high concentration is diluted with the overflow of to-be-processed water when the water surface of to-be-processed water rises.

  By making the magnet used to magnetically separate the magnetic flocs into a rotary type, even if the water surface fluctuates up and down, the magnetic force at the water surface position increases periodically. As a result, a large number of magnetic flocs existing in the vicinity of the water surface are magnetically attracted. This can solve the problem that the performance of removing magnetic flocs is lowered.

  In addition, by providing a sewage recovery layer that collects sewage between the water tank that filters the sewage and the sludge recovery tank, the sewage is recovered when the surface of the sewage rises. It flows into the tank and prevents it from flowing into the sludge collection tank. This structure prevents high-concentration sludge in the sludge collection tank from thinning with the water to be treated, thus preventing an increase in the sludge volume and the dehydration cost required to further reduce the water content of the collected sludge. Can solve the increase problem.

  According to the present invention, a magnetic separation and purification device includes a magnetic material and a flocculant, or an object to be removed and a fluid to be treated containing a magnetic substance to be removed or a non-magnetic substance to be removed. Opening through which the to-be-removed object or magnetic substance cannot pass to filter the fluid to be treated containing the magnetic substance that makes the object to be removed magnetized by adding an additive that chemically reacts to generate a magnetic substance. A rotatable filtering means, a rotatable magnetic field generating means for magnetically attracting the magnetic substance filtered by the filtering means, and the magnetically attracted magnetic substance move in space in the direction of the magnetic field generating means A sludge collecting means capable of rotating to place and collect a magnetic floc containing the magnetic substance and sludge on the surface, and a magnetic field rotating means for rotating the magnetic field generating means. A structure that moves between spatial and small field strength of the magnetic field generating means is provided with scraping means for scraping deposits on the sludge recovery means. Furthermore, it has the sludge collection means which collect | recovers the said to-be-removed thing and a magnetic substance.

  In addition, the magnetic separation and purification apparatus constructed according to the present invention includes a magnetic substance and a flocculant or a substance to be treated in a fluid to be treated containing a magnetic substance to be removed having magnetism or a fluid containing a substance to be removed. By adding an additive that chemically reacts with the removed substance to generate a magnetic substance, the removed object or magnetic substance passes through to filter the fluid to be treated containing the magnetic substance that has made the removed object magnetic. A filtering means capable of rotating with a mesh opening, a magnetic field generating means for magnetically attracting the magnetic material filtered by the filtering means by a magnetic force, and the magnetic material attracted magnetically moves in the direction of the magnetic field generating means. And a sludge collecting means for collecting and recovering the magnetic floc on the surface, and the sludge collecting means has a structure capable of moving in a space where the magnetic field intensity of the magnetic field generating means is large, and further the sludge collecting A scraping means for scraping the deposits on the stage is provided, and the filtering means is disposed between the sludge collecting means for collecting the object to be removed and the magnetic substance, the water tank having the filtering means, and the sludge collecting means. There is an overflow water collecting means through which the non-processed fluid before flowing in overflows.

  The above-described magnetic separation and purification apparatus has deposit transfer means for transferring the deposit on the sludge recovery means in the deposit transfer direction by the scraping means.

  According to the present invention, magnetic flocks (including sludge and magnetic substances) can be separated well against fluctuations in the water surface of the magnetic separation section formed between the filtration net (net 21) and the sludge recovery rotating body 33. A magnetic separation and purification device capable of stably generating and discharging high-density sludge is provided.

  Further, according to the present invention, since the overflow water collecting device 60 is provided in the water tank 22 even when the water level of the water to be treated rises, the sludge collected at a high concentration can overflow the water to be treated. It wo n’t fade away.

  A magnetic separation and purification device that separates sludge contained in a fluid to be treated using magnetic force and purifies the fluid to be treated is provided in a water tank, has a cylindrical filtration net, and contains a magnetic substance. A rotating filter that filters sludge and magnetic substances from the treatment fluid, and a cylindrical shape that faces the rotating filter in the horizontal direction and carries sludge and magnetic substances on the surface as it rotates. A sludge recovery rotating body, and a sludge recovery rotating body having an axis, and a rotating body and a plurality of magnets attached on a circumference of the rotating body, at least the side located on the rotary filtering body is The sludge is placed on the surface of the sludge recovery rotator by magnetically attracting the magnetic material, which is disposed close to the inner peripheral surface of the sludge recovery rotator and filtered by the rotary filter, onto the surface of the sludge recovery rotator. Magnetic rotating body to be transferred and sludge recovery Configured to include a scraping device for scraping sludge and magnetic substance being conveyed on the surface of the rolling body.

Further, the magnetic rotating body is arranged eccentrically with respect to the sludge collecting rotating body.
Further, the magnetic rotating body may be disposed concentrically with the sludge collecting rotating body. In this case, a rotating blade driven to rotate by a drive source is placed close to the surface of the sludge collecting rotating body. It is provided on the upper side.

Further, the sludge recovery rotating body and the magnetic rotating body can be integrated to share a rotational drive source.
Furthermore, the overflow water collection apparatus into which the to-be-processed fluid from the said water tank flows over and flows can be provided.

Further, a magnetic separation and purification method for separating sludge contained in a fluid to be treated using magnetic force and purifying the fluid to be treated is magnetically arranged by a rotary filter body disposed in a water tank and having a cylindrical filtration net. Sludge and magnetic substances are filtered from the object to be treated, and the shaft has a central axis in the cylindrical sludge recovery rotating body, and at least the side located on the rotary filtering body is close to the inner peripheral surface of the sludge recovery rotating body Magnetic sludge is disposed on the water surface of the fluid to be treated between the plurality of magnets arranged and circumferentially arranged by a magnetic rotating body and filtered by the rotary filtering body. Magnetically sucking on the surface of the recovery rotator to transfer the sludge onto the surface of the sludge recovery rotator, and scraping off the magnetic block containing the sludge and magnetic material conveyed on the surface of the sludge recovery rotator. Do.
Further, by arranging the magnetic rotating body eccentrically with respect to the sludge collecting rotating body, the sludge collecting rotating body rotates in a space having a large and small magnetic strength.

An embodiment of the present invention will be described below with reference to FIGS. 2 is an enlarged cross-sectional view of the membrane separation device 14 of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG.
Raw water 2 which is treated water containing sludge from which large trash of several millimeters is removed is stored in the raw water storage tank 1, and a predetermined amount of raw water 2 is sent to a pipe 4 by a pump 3. Coagulant and polymer reinforcement that provide aluminum ions and iron ions such as magnetic powder such as iron tetroxide and pH adjuster, aqueous solution such as polyaluminum chloride, iron chloride and ferric sulfate from seeding agent adjusting device 5 Agents and the like are added into the pipe 4 through the conduit 6 and stirred in the stirring tank 7 at a high speed by the stirring blade 9 that is driven to rotate by the motor 8, thereby producing a magnetic micro floc (magnetic floc) of several hundred microns. Generate. Thereafter, a polymer reinforcing agent or the like is added from the polymer agent adjusting device 11 into the pipe 10 through the conduit 12, and is slowly agitated at a low speed with the stirring blade 15 rotated by the motor 14 of the agitation tank 13, To-be-treated water 17 including a magnetic floc 16 (not shown in FIG. 1) having a size of several millimeters is generated. The fluid to be treated may contain a magnetic substance to be removed that is magnetic from the beginning without being added.

  The water to be treated 17 generated in this way is passed through the conduit 18 to the magnetic separation and purification device 19. The structure of the membrane magnetic separation and purification device 19 will be described with reference to FIGS. A filter having an opening having an opening of several micrometers to several tens of micrometers made of stainless steel fine wire, copper fine wire, polyester fiber, or the like on the outer peripheral surface of the rotating drum 20 rotated by a driving source (not shown). A net 21 is provided. That is, a cylindrical filter screen is provided. A rotating filter body is formed by the rotating drum 20 and the net 21.

The treated water 17 flowing into the water tank 22 passes through the net 21 and flows into the drum 20. At this time, the magnetic floc 16 containing sludge and magnetic substance in the water to be treated is captured by the inner surface of the net 21, and the water that has passed through the net 21 and separated from the magnetic floc 16 becomes purified water and is discharged from the opening 23, It passes through the pipe 24 and accumulates in the purified water tank 25 and is discharged out of the system. The power that the treated water 17 passes through the net 21 is a liquid level difference between the treated water 17 and the purified water in the drum 20.
On the other hand, in FIG. 2, the magnetic floc 16 is filtered and attached to the outer surface of the mesh 21 rotating counterclockwise, and becomes a deposit and is exposed to the atmosphere on the liquid surface.

  Purified water in a purified water tank (referred to as a water tank) 25 is pressurized by a pump 26 and sent from a conduit 27 to a shower pipe 28, and shower water is blown from the inner surface of the net 21 to the outer surface side. The magnetic floc 16 accumulated on the outer surface of the net 21 is peeled off by shower water, and the surface of the net 21 is regenerated. The washed-out magnetic floc 16 stays on the surface of the water to be treated 17 in the water tank 22 with a sludge collection body to be described later.

  A rotary magnet rotating body 29 used as a magnetic field generating means for magnetic separation has a permanent magnet 31 bonded to a circumference of a rotating body 30 made of a non-magnetic material, for example, in a plurality of grooves on the outer surface, and the like. The rotating body 30 is rotated by controlling the number of rotations by a motor 32. The permanent magnets 31 are regularly arranged with minute gaps in the circumferential direction and the cylindrical surface direction, and are firmly fixed to the rotating body 30.

On the other hand, the sludge transfer rotating body 33 made of a non-magnetic material used for transferring the magnetically separated magnetic floc is rotated by a motor 35 via a shaft 34 and rotated. At the end, the shaft 34 is supported by the wall of the water tank 22 by the water-tight rotating support 36, and at the other end, the outer periphery of the rotating body 33 is connected to the water tank through the water-tight rotating support 37. The inner wall of the rotary support 36 is open to the atmosphere. The sludge collection body 33 is disposed close to the rotary filter body in the horizontal direction. The horizontal direction includes being horizontal.

The magnet rotating body 29 is inserted into the sludge collecting rotating body 33 from the air release surface of the sludge collecting rotating body 33, and the magnetic flocs 16 group washed away with the washing water is stopped, that is, at the position on the rotating drum side. Installed to approach. Here, in the present embodiment, the axis of the sludge recovery rotating body 33 and the axis of the rotating body 30 of the magnet rotating body 29 are shifted from each other. That is eccentric to the axis of the axis and magnet rotator 29 of the sludge collecting body. Although not shown in the drawing, the magnet rotating body 29 is fixed to a part of the water tank 22 with a bolt or the like so as to be located at a predetermined place. The rotation direction of the sludge collection | recovery rotary body 33 and the rotary body 30 is the same direction, and rotates to the direction which moves the magnetic flock 16 group magnetically attracted to the atmosphere side. Both rotation speeds may be the same or different. In the case of the present embodiment, the rotational speed on the magnet-side rotating body 30 side is greater than the rotational speed of the sludge collecting rotating body 33. That is, the rotation speed is fast.

  As described above, since the magnet rotating body 2 disposed close to the sludge collecting rotating body 33 is a rotary type, even if the water level of the water to be treated fluctuates up and down, the magnetic force at the water surface position periodically becomes stronger. Many magnetic flocs existing in the vicinity of the water surface are magnetically attracted satisfactorily.

  The group of magnetic flocs 16 that are washed away and stay near the water surface are attracted and moved to the magnet side by the magnetic field of the magnet rotating body 29, and are attached to the outer surface of the sludge collecting rotating body 33 that rotates outside the magnet rotating body 29. After that, the sludge collection rotating body 33 is exposed to the atmosphere as it rotates. In the atmosphere, excess water in the magnetic floc 16 group flows down on the surface of the rotating body 33 due to gravity, and the magnetic floc 16 group is further concentrated. Here, the moisture content of the magnetic floc decreases to about 97%.

  The concentrated magnetic flocs 16 group on the surface of the sludge collecting rotator 33 are moved by the rotation of the sludge collecting rotator 33. At this time, since the axial center of the sludge recovery rotating body 33 and the axial center of the rotating body 30 are arranged so as to be shifted, that is, moved in a space with a large and small magnetic field strength, in a small space. The magnetic flocs are strongly attracted, and when the magnetic flocs are gradually moved away from the magnet rotating body 29, the magnetic attraction force is rapidly reduced as the distance from the magnet rotating body 29 is increased. The magnetic flocks 16 are separated from the surface of the sludge collection rotating body 33 by the spatula 38 partially supported by the water tank 22 so as to be scraped off, fall into the sludge collection tank 39 by gravity, and are separated and collected as sludge. The

  The discharged sludge is introduced into a dewatering device 41 such as a centrifuge or a belt press through a pipe 40, the water content is reduced to about 85% or less so that water does not leak from the sludge during transportation, and organic substances during composting are decomposed. The high-concentration sludge concentrated to about 75% by activating the microorganisms to be stored is stored in the sludge tank 43 through the pipe 42. The sludge is transported by truck to a disposal site, incineration plant or composting plant.

  The treated sewage dehydrated by the dehydrator enters the treated sewage tank 45 through the pipe 44, is pressurized by the pump 46, returns to the raw water tank 1 through the pipe 47, and is again introduced into the treatment process.

In the operation control device 48, raw water, liquid level, turbidity, temperature, ph value and the like are measured by the sensor 49, and the information is transmitted to the operation control device 48 through the signal line 50. Based on that information, the optimum-agent to produce good magnetic flocs (p H adjusting agent, magnetic powder, coagulant) addition amount of the, calculated with the optimal amount calculating program previously inputted, the control information Is transmitted to the medicine tank 5 via the signal line 51, and the optimum amount is added. At the same time,
The number of rotations of the stirring motor The stop time in the stirring tank is calculated in the operation control device 48, and the control information is transmitted to the motor 8 via the signal line 52 to rotate the stirring blade 9 at the optimum number of rotations. , And transmitted via the signal line 53 to control the discharge amount of the pump 3 for determining the stopping time in the stirring tank.

In addition, it is ideal for producing good magnetic flocs.
Is calculated by the optimum amount calculation program inputted in advance, and the control information is transmitted to the medicine tank 11 via the signal line 54 to add the optimum amount. At the same time,
The rotation speed of the stirring motor is calculated in the operation control device 48, and the control information is transmitted to the motor 14 via the signal line 55, and the stirring blade 15 is rotated at the optimal rotation speed.

  On the other hand, in the magnetic separation and purification device 19, the liquid level of the water to be treated 17 in the water tank 22 is measured by the sensor 56, and the information is transmitted to the operation control device 48 through the signal line 57. Based on this information, the rotating drum is arranged so that the liquid surface position of the water to be treated is substantially at the center of the installation position of the magnet rotating body 29, that is, the average value of the magnetic field generated by the magnet rotating body 29 is at the maximum position. The optimum rotational speed of 20 and the appropriate recovery speed of the magnetic floc 16 group are calculated by the optimum amount calculation program inputted in advance, and the control signal is sent to the rotary drum rotary motor (not shown) via the signal line 58. Then, the signal is transmitted to the motor 35 via the signal line 59, and each is controlled to an optimum rotation speed.

  In order to magnetically attract the cleaned magnetic flocs 16 group with the magnetic field of the magnet rotating body 29, the water surface of the water to be treated in the water tank 22 is substantially at the center of the magnetic field of the magnet rotating body 29, that is, AA in FIG. It is desirable to be at the position of the cross section. When the water surface is lower than the position of the AA cross section, the magnetic floc 16 group can be attached to the surface of the sludge recovery rotating body 33 only at a position lower than the water surface. Here, when the magnet rotating body 29 is stationary, the magnetic field distribution generated by the magnet rotating body 29 is attached because the arranged permanent magnets have non-uniform magnetic field distribution on the magnet surface. The magnetic field distribution generated by the magnet group is also non-uniform, and the magnetic attractive force is non-uniform.

  Accordingly, when the water surface where a large number of the washed magnetic flocs 16 stays is in a portion where the magnetic attractive force is weak, the processing performance of magnetically separating and recovering the magnetic flocs 16 is deteriorated. However, in the present embodiment in which the magnet rotating body 29 rotates, a magnetic field portion having a strong magnetic field distribution is always passed through the water surface portion in a short period. Therefore, a large number of magnetic flocks 16 on the water surface portion are magnetically attracted. The magnetic floc 16 group is attached to the outer surface of the sludge collecting rotator 33 and the magnetic field is made substantially the same as the moving speed of the sludge collecting rotator 33, so that the magnetic floc 16 group is held by the rotator 30 while maintaining the magnetic attraction force. Since it can transfer, it can prevent that the collection processing performance of a magnetic floc falls.

  On the other hand, when the water surface is higher than the position of the AA cross section, a large number of magnetic flocs 16 groups remain at a position higher than the water surface. Hard to adhere to the surface. Here, when the magnet rotating body 29 is stationary, the magnetic field distribution generated by the magnet rotating body 29 becomes non-uniform and the magnetic attractive force becomes non-uniform as in the case described above. Therefore, when the water surface is at a site where the magnetic attractive force is weak, the collection performance of the magnetic flock 16 group is lowered. However, in the present embodiment in which the magnet 29 rotates, a magnetic field portion having a strong magnetic field distribution is always passed through the water surface portion in a short period corresponding to the shape of the magnet. The magnetic floc 16 group is attached to the outer surface of the sludge collecting rotator 33 by magnetic attraction, and the magnetic field is made substantially the same as the moving speed of the sludge collecting rotator 33 to maintain the magnetic attraction force in the moving method. Since it can transfer with the rotary body 30, it can prevent that the collection processing performance of a magnetic floc falls.

  Further, the liquid level of the water to be treated in the water tank 22 is generated when the liquid level of the water to be treated in the water tank 22 is lower than the inflow amount due to insufficient rotation of the net 21 or the like. When the water rises, the overflow water recovery tank 61 is provided so that the water to be processed does not overflow the sludge recovery tank 39 from the side of the water to be processed in the water tank 22 beyond the wall 60, and the overflow water passes through the pipe 62. Then, after entering the treated wastewater tank 45 and being pressurized by the pump 46, it returns to the raw water tank 1 through the pipe 47.

  With this structure, the level of the water to be treated in the water tank 22 rises and exceeds the wall 60, and the treated water 17 does not flow into the sludge tank 39 but flows into the overflow water recovery tank 61. Therefore, the high-concentration sludge collected in the sludge tank 39 is increased in water content due to the inflow of the water to be treated, becomes low in concentration, increases the sludge volume, and prevents the sludge treatment cost from increasing.

  As is clear from the above description, according to the present embodiment, the magnetic body made of a magnet can be rotated inside the sludge collection rotating body 33 for sludge collection, and therefore, due to the non-uniform magnetic attraction force of the magnet. The non-uniformity of the recovery capability of the magnetic floc group is eliminated and uniformed, and there is an effect that the recovery performance can be maintained and the purification performance can be improved. In particular, this configuration is effective in avoiding the phenomenon that is likely to occur between the rotary filter body and the sludge recovery rotary body 33.

  In addition, by providing an overflow water recovery tank between the high-concentration sludge recovery tank adjacent to the water tank to be processed, when the water level of the water tank to be processed rises, the water to be processed flows into the overflow water recovery tank. Since flowing water does not flow into the high-concentration sludge collection tank, the high-concentration sludge collected in the high-concentration sludge collection tank is diluted with the water to be treated, and the sludge volume increases, thereby preventing an increase in sludge treatment cost. .

  4 and 5 show another embodiment according to the present invention. The same components as those in the previous embodiment are given the same reference numerals so that the description will not be repeated. The same applies to the other embodiments. 2 and 3 is different from FIG. 2 and FIG. 3 in that the outer surface of the rotating body 66 of the magnet rotating body (corresponding to 29 in the first embodiment) 68 is enlarged to the inside of the sludge collecting rotating body 33 and the magnet rotating body 68 is enlarged. And the axis of the sludge recovery rotator 33 are substantially coincided with each other, and the rotor blade 63 as a mechanical discharge means is provided on the sludge recovery tank 39 side of the magnetic floc 16 group on the sludge recovery rotator 33 by the spatula 38. In the point. A rotary blade 63 made of a material that is difficult to adhere, such as a fluorinated compound, rotates a shaft 65 to which a sludge discharge blade 64 is attached by a drive source, that is, a motor (not shown). The rotation direction of the sludge collection | recovery rotary body 33 and the magnet rotary body 68 is the same direction, and rotates to the direction which moves the magnetic flock 16 group magnetically attracted to the atmosphere side. Both rotation speeds may be the same or different. In the case of the present embodiment, the rotational speed on the magnet rotating body 68 side on the magnet side is slightly higher than the rotational speed of the sludge collecting rotating body 33. That is, the rotation speed is slightly increased.

  According to the present embodiment, since the magnet 67 constituting the magnet rotating body 68 can be disposed close to the entire circumference of the sludge collecting rotating body 33, the water surface described in the first embodiment has the AA cross section. Even when the position is higher or lower than the position, the magnet 67 is located near the water surface in contact with the outer surface of the sludge collection rotating body 33, and the magnet 67 further rotates, so that the magnetic attractive force acts strongly and uniformly. Therefore, since the magnetic field portion having a strong magnetic field distribution is always passed through the water surface in a short cycle even with respect to the vertical fluctuation of the water surface, a large number of magnetic flocs 16 group on the water surface portion are magnetically attracted and the sludge recovery rotating body 33 The magnetic flocs 16 group can be favorably moved by attaching the magnetic field to the outer surface and moving the magnetic field substantially the same as the moving speed of the sludge collecting rotator 33 or by moving the magnetic force forward in the moving direction.

  Further, since the tip of the spatula 38 of the scraping part and the magnet 67 are located close to each other, a large magnetic attraction force acts on the magnetic floc 16 on the sludge recovery rotating body 33 scraped by the spatula 38, and it remains as it is. Since the magnetic floc 16 group cannot move on the spatula 38 due to its own weight, the sludge discharge blade 64 moves it to the sludge collection tank 39 side and separates it from the magnet 31, thereby reducing the magnetic attractive force and moving it by its own weight.

  Therefore, in this embodiment, even when the surface of the water to be treated in the water tank 22 fluctuates, there is an effect that the magnetic floc can be removed well and the purification performance can be prevented from being lowered.

  FIG. 6 shows another embodiment according to the present invention. 4 and FIG. 5 is that the cylindrical magnet rotating body 69 is enlarged all the inside of the sludge collecting rotating body 33, and the sludge collecting rotating body 33 and the cylindrical magnet rotating body 69 are bolted. This is because it is integrated with 70.

  According to the present embodiment, since the cylindrical magnet rotating body 69 can be rotated by being integrated with the sludge collecting rotating body 33, the motor for rotating the cylindrical magnet rotating body 69 can be omitted, and the apparatus cost is further reduced. There is an effect that can be done.

  Moreover, although the case where the permanent magnet was used as a magnetic field generation | occurrence | production means was shown, even if it uses the superconducting electromagnet cooled by the normal conducting electromagnet or the refrigerator, the same effect will arise.

  In the above embodiment, the case where the net 21 is formed in a drum shape has been described. However, the same applies to the case where the net 21 is configured in a disk shape and a plurality of the disks are arranged in the vertical direction to configure the apparatus. An effect is produced.

  In the previous Example 1-3, the rotary filter was used, but without using the rotary filter, the magnetic slug, that is, sludge was attracted to the magnetic force on the surface of the sludge recovery rotary body 33. It is also possible to place them.

  That is, in this embodiment, a magnetic separation and purification device that separates sludge contained in a fluid to be treated using magnetic force and purifies the fluid to be treated is disposed in a water tank, horizontally disposed, and rotated. A cylindrical sludge recovery rotating body that sucks, places, and conveys sludge and magnetic material on the surface, and has a shaft center in the sludge recovery rotating body, and the circumference of the rotating body and the rotating body A plurality of magnets mounted thereon, at least a side located on the rotary filter body is disposed close to an inner peripheral surface of the sludge recovery rotary body, and the magnetic substance filtered by the rotary filter body is recovered in the sludge A magnetic rotating body for transferring sludge onto the surface of the sludge recovery rotating body by magnetically attracting onto the surface of the rotating body, and a scraping that scrapes off the sludge and magnetic material conveyed on the surface of the sludge recovery rotating body. It consists of a device.

  Even in this configuration, the sludge collection rotating body 33 and the rotating magnetic body disposed therein are not integrated with each other, but are configured separately, so that the magnetic force acting on the magnetic substance is made uniform. Therefore, the adsorption control becomes easier. Furthermore, according to this configuration, the rotational phase between the sludge collection rotating body 33 and the magnetic body can be easily changed, which is convenient for suction and scraping of magnetic sludge.

The block diagram of the magnetic separation purification system of one Example of this invention. Sectional drawing of the magnetic separation purification apparatus of one Example of this invention. AA sectional drawing of FIG. Sectional drawing of the magnetic separation purification apparatus of the other Example of this invention. AA sectional drawing of FIG. Sectional drawing of the magnetic separation purification apparatus of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 16 ... Magnetic flock, 17 ... Treated water, 19 ... Magnetic separation and purification apparatus, 21 ... Net, 22 ... Water tank, 29 ... Magnet rotating body, 30 ... Sludge collection rotating body, 31 ... Permanent magnet, 33 ... Rotating body, 38 ... spatula, 39 ... sludge collection tank, 61 ... sewage collection tank.

Claims (8)

In a magnetic separation and purification device that separates a magnetic floc from a fluid to be treated, including a magnetic floc formed of at least sludge and a magnetic substance, using magnetic force, and purifies the fluid to be treated.
A tank,
A rotating filter body disposed in the water tank, having a cylindrical filtration net, and filtering and separating magnetic floc from the fluid to be treated;
A cylindrical sludge recovery rotating body that faces and opposes the rotating filter in the horizontal direction and places and transports a magnetic floc separated on the surface as it rotates.
The sludge recovery rotating body has an axis, and is composed of a rotating body and a plurality of magnets mounted on the circumference of the rotating body, and at least on the side located on the rotating filter body, the sludge rotating body in the horizontal direction A magnet rotating body disposed in the vicinity of the surface of the sludge recovery rotating body on a cross section passing through the center of
The water surface is set in the vicinity of the center of the magnetic field on the cross section passing through the horizontal center of the magnet rotating body to form a strong magnetic field distribution near the water surface, and the magnet rotating body is filtered and separated by the rotating filter body. Magnetically attracted to the surface of the sludge rotator near the water surface and transferred onto the surface of the sludge recovery rotator,
And a scraping device that scrapes off the magnetic floc conveyed on the surface of the sludge recovery rotating body.   2. The magnet rotating body according to claim 1, wherein the magnet rotating body has an axial center that is eccentric in a horizontal direction with respect to the axis of the sludge collecting rotating body, instead of having the axis of the sludge collecting rotating body. Magnetic separation and purification device.   2. The magnet rotating body according to claim 1, wherein the magnet rotating body is disposed concentrically with respect to the sludge collecting rotating body, and a rotating blade driven to rotate by a driving source is provided on the upper side in the vicinity of the surface of the sludge collecting rotating body. Magnetic separation and purification device characterized by the above.   4. The magnetic separation and purification device according to claim 3, wherein the sludge recovery rotating body and the magnet rotating body are integrated to share a rotational drive source.   5. The magnetic separation and purification device according to claim 1, further comprising an overflow water collecting device through which the fluid to be treated from the water tank flows and flows. In magnetic separation purifying method according to magnetic separation purifying apparatus according to claim 1, 5 or,
The water surface is set near the center of the magnetic field in the horizontal section of the magnet rotating body, and the magnetic floc filtered by the rotating filter is magnetically attracted onto the surface of the sludge rotating body in the vicinity of the water surface. A magnetic separation and purification method characterized by magnetically attracting onto the surface of the sludge collecting rotator and transferring it onto the surface of the sludge collecting rotator.   7. The magnetic separation and purification method according to claim 6, wherein a magnetic floc is formed by adding a pH adjusting agent, magnetic powder, a flocculant and a polymer to sludge.   8. The magnetic separation and purification method according to claim 7, wherein the sludge recovery rotating body is rotated in a space having a large and small magnetic strength by disposing the magnet rotating body eccentrically with respect to the sludge recovery rotating body.

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