JP2006297264A - Magnetic separation method and water treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic separation method which enables a continuous treatment without requiring large power and to provide a water treatment method. <P>SOLUTION: Fluid passages 15-45 of a device 1, a collecting process of obtaining treated water of which magnetic materials are removed by making materials to be treated pass through a magnetic filters 19-49 and a regenerating process of removing the magnetic materials collected to the magnetic filters 19-49 from the magnetic filters by making a washing liquid fluidize at a higher flow rate than that of a liquid to be treated in the collecting process in the state of forming a magnetic field of the same magnetic flux density as that of the collecting process at a position of the magnetic filters 19-49 are carried out. In this device 1, the collecting process and the regenerating process are alternately carried out every fluid passage so that the collecting process is carried out in at least one fluid passage within the fluid passages 15-45. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnetic separation method and a water treatment method.

Conventionally, a magnetic separation method for removing a magnetic substance in a liquid to be processed using a ferromagnetic magnetic filter is known (for example, Patent Document 1). The apparatus used in the method described in Patent Document 1 includes a rotating magnetic filter. The magnetic filter rotates so that a part thereof crosses the flow path of the liquid to be processed, and a part of the flow path that generates a suction force in a magnetic field formed in the flow path causes the liquid to be processed. Collect magnetic material. And the part which collected the magnetic substance is wash | cleaned when a magnetic field moves out of a weak flow path by rotation of a magnetic filter, and the collected magnetic substance is wiped off. As described above, it has been proposed to employ a rotating magnetic filter to enable continuous magnetic separation of water to be treated while repeating collection of magnetic substances and regeneration of the magnetic filter.
JP 2003-19409 A

  However, in the above method, when the magnetic filter is rotated, the ferromagnetic magnetic filter is moved in the magnetic field. Therefore, a large force is required for this rotation, and a large amount of power is required. .

  Accordingly, an object of the present invention is to provide a magnetic separation method and a water treatment method capable of continuous treatment without requiring large power.

  In the magnetic separation method according to the present invention, a liquid to be treated containing a magnetic substance is flowed and passed through a magnetic filter located in a magnetic field formed therein, and the magnetic substance in the liquid to be treated is collected by the magnetic filter. In addition, a collection process for obtaining a treatment liquid from which magnetic substances have been removed and a cleaning liquid for cleaning the magnetic filter are introduced in a state where a magnetic field having the same magnetic flux density as that of the collection process is formed at the position of the magnetic filter. And a regeneration step in which the cleaning liquid is caused to flow at a flow rate greater than that of the liquid to be treated in the collection step, and the magnetic substance collected in the magnetic filter is removed from the magnetic filter. The treatment liquid is distributed and introduced, and the collection process and the regeneration process are alternately performed for each flow path so that the collection process is performed in at least one of the flow paths. Each flow of treatment liquid from which substances have been removed Characterized in that obtained from.

  In this magnetic separation method, the liquid to be treated is distributed and introduced into a plurality of flow paths, and the collection process and the regeneration process are alternately performed in each of these flow paths. In the collection step, the liquid to be treated is caused to flow at a relatively small flow rate. In this case, when the magnetic substance in the liquid to be processed passes through the magnetic filter magnetized in the magnetic field, the magnetic substance is collected by the magnetic filter by the attractive force of the magnetic filter. On the other hand, in the regeneration process, a magnetic field having the same magnetic flux density as in the collecting process is formed at the position of the magnetic filter, and the cleaning liquid is caused to flow at a relatively large flow rate. In this case, the magnetic filter has the same attraction force with respect to the magnetic substance as in the collection step, but the magnetic filter has a higher flow rate than that of the liquid to be treated in the collection step. Even if the magnetic flux density at the position is not changed, the magnetic substance collected in the magnetic filter is removed, and the magnetic filter is regenerated. For this reason, it is unnecessary to move the magnetic filter between a place where the magnetic flux density is high and a place where the magnetic flux density is low, and as a result, the liquid to be treated can be processed without requiring a large amount of power. Further, in this magnetic separation method, a plurality of flow paths as described above are used, and while maintaining the state in which the collection process is performed in at least one of the plurality of flow paths, The regeneration process is alternately performed. Therefore, the liquid to be treated is always removed of the magnetic substance in any flow path, and the introduced liquid to be treated can be continuously processed. Here, the magnetic substance in the present invention includes a substance having magnetism alone, and a substance having magnetism as a whole by integrating a substance having no magnetism and a substance having magnetism.

  The water treatment method according to the present invention provides magnetism to solids contained in the water to be treated to generate a magnetic substance, causes the water to be treated containing the magnetic substance to flow, and is located within a magnetic field formed therein. Passing through the magnetic filter, collecting the magnetic substance in the water to be treated with the magnetic filter, and obtaining the treated water from which the magnetic substance has been removed. In this state, the cleaning water for cleaning the magnetic filter is introduced, and the cleaning water is flowed at a flow rate larger than the water to be treated in the collecting process, and the magnetic substance collected in the magnetic filter is removed from the magnetic filter. The flow path is such that the water to be treated is distributed and introduced into the plurality of flow paths in which the collection process is performed and the collection process is performed in at least one of the plurality of flow paths. Every time the collection process and re And a step by alternately carried out, characterized in that to obtain a treated water magnetic substance has been removed from the flow passage.

  In this water treatment method, first, magnetism is imparted to the solid matter in the water to be treated, and the solid matter that originally has no magnetism is made a magnetic substance that can be separated by a magnetic filter. And this to-be-processed water is distributed and introduce | transduced into several flow paths, and a collection process and a reproduction | regeneration process are alternately performed in each of these flow paths. In the collection process, the water to be treated is caused to flow at a relatively small flow rate. In this case, when passing through the magnetic filter magnetized in the magnetic field, the magnetic substance in the water to be treated is collected by the magnetic filter by the attractive force of the magnetic filter. On the other hand, in the regeneration process, a magnetic field having the same magnetic flux density as in the collection process is formed at the position of the magnetic filter, and the cleaning water is caused to flow at a relatively large flow rate. In this case, the magnetic filter has the same attractive force as the collection step with respect to the magnetic substance, but the flow rate of the cleaning water is larger than the flow rate of the water to be treated in the collection step. Even without changing the magnetic flux density at the position, the magnetic substance collected in the magnetic filter is removed, and the magnetic filter is regenerated. For this reason, it is unnecessary to move the magnetic filter between a place where the magnetic flux density is high and a place where the magnetic flux density is low, and as a result, the water to be treated can be treated without requiring large power. Further, in this magnetic separation method, a plurality of flow paths as described above are used, and while maintaining the state in which the collection process is performed in at least one of the plurality of flow paths, The regeneration process is alternately performed. Therefore, the water to be treated is always removed of the magnetic substance in any flow path, and the introduced water to be treated can be continuously treated.

  According to the present invention, in the magnetic separation method and the water treatment method, continuous treatment is possible without requiring large power.

  Hereinafter, preferred embodiments of a magnetic separation method and a water treatment method according to the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, an example of a high gradient magnetic separation apparatus to which the water treatment method is applied will be described prior to the description of the water treatment method that is an embodiment of the magnetic separation method of the present invention.

  A high gradient magnetic separation device 1 shown in FIG. 1 is a water treatment device for removing magnetic substances contained in water to be treated using a magnetic filter. The apparatus 1 is used for the process of removing earth and sand (solid matter) having a particle size of about 10 μm contained in sewage (treated liquid) as treated water, for example. Since the earth and sand particles in the sewage do not have magnetism, in this case, separation by a magnetic filter is possible by providing magnetism in advance by a pretreatment process described later. Then, the pretreated sewage is introduced into the device 1 through the line L1, and the sewage is treated by the device 1 so that the magnetic material and the magnetic substance originally contained in the sewage are removed by the magnetic filter. Collect. As a result, treated water after removing earth and sand from sewage is obtained through line L2.

  This device 1 includes four flow paths for flowing sewage. These flow paths 15, 25, 35, 45 are respectively constituted by internal spaces of four cylindrical flow pipes 17, 27, 37, 47 extending in parallel with each other. Further, columnar magnetic filters 19, 29, 39, and 49 are fixed to the inner walls of the flow tubes 17, 27, 37, and 47, respectively. The magnetic filters 19, 29, 39, and 49 are configured by laminating a plurality of circular nets made of a ferromagnetic material such as SUS430, which is ferritic stainless steel, in the extending direction of the flow paths 15, 25, 35, and 45. Has been. These flow paths 15, 25, 35, 45 have the same configuration, and the magnetic filters 19, 29, 39, 49 also have the same configuration.

  Lines L11, L21, L31, and L41 branched from the line L1 are connected to the flow tubes 17, 27, 37, and 47, and lines L12, L22, L32, and L42 branched from the line L2 are connected to the flow tubes 17, 27, 37, and 47, respectively. . Further, the flow pipes 17, 27, 37, 47 are respectively connected with lines L13, L23, L33, L43 branched from the line L3, and lines L14, L24, L34, L44 branched from the line L4, respectively. ing.

  The sewage treated by the apparatus 1 is divided and introduced into each of the flow paths 15, 25, 35, and 45 through the line L1 and the lines L11, L12, L13, and L14, and is collected in each flow path. The treated water treated in (details will be described later) is discharged to the outside of the apparatus 1 through the lines L12, L22, L32, L42 and the line L2.

  The washing water for washing the magnetic filters 19, 29, 39, 49 is distributed and introduced to the flow paths 15, 25, 35, 45 via the line L3 and the lines L13, L23, L33, L43, respectively. Is done. The washing water after washing the magnetic filters 19, 29, 39, and 49 in the regeneration step (details will be described later) in the respective flow paths is provided via the lines L 14, L 24, L 34, L 44 and the line L 4. 1 is discharged to the outside.

  The apparatus 1 includes a cylindrical superconducting electromagnet 3 positioned around the flow tubes 17, 27, 37, 47. The superconducting electromagnet 3 and the flow tubes 17, 27, 37, 47 are fixed so as not to change their positional relationship, and the superconducting electromagnet 3 is a portion where the magnetic filters 19, 29, 39, 49 are arranged. Is arranged so as to surround. Based on such a configuration, when a current is supplied to the superconducting electromagnet 3, a magnetic field is formed at the positions of the magnetic filters 19, 29, 39, and 49. At this time, the magnetic flux densities of the magnetic fields formed at the positions of the filters 19, 29, 39, and 49 are all equal, and the magnetic tubes 19, 29, 39, and 49 are magnetized with the same magnitude. 17, 27, 37, 47 are arranged.

  Next, an example of the water treatment method which is an embodiment of the magnetic separation method of the present invention will be described.

(Pretreatment process)
As a pretreatment prior to introduction into the apparatus 1, magnetite, a flocculant and an auxiliary polymer are introduced into the sewage. Then, the sediment in the sewage to be removed and the magnetite, which is a magnetic substance, are integrated by the flocculant, and the entire integrated particles behave as a magnetic substance. Hereinafter, the magnetic substance integrated in this way is referred to as “magnetic frog”. By the treatment as described above, magnetism is imparted to the earth and sand to be removed, and pretreated sewage to be introduced into the apparatus 1 is generated. As described above, when this sewage is introduced into the apparatus 1 through the line L1, it is distributed and introduced into each of the flow paths 15, 25, 35, and 45 through the lines L11, L12, L13, and L14.

  Thereafter, since the collection process and the regeneration process performed in the four flow paths are all the same, only the process in the flow path 15 will be described below as a representative.

(Collection process)
First, current is supplied to the superconducting electromagnet 3 so that a magnetic field having a magnetic flux density of 0.25 T or more and 1.0 T or less (here, 0.5 T) is formed at the position of the magnetic filter 19 in the flow path 15. To do. Then, the magnetic filter 19 made of a ferromagnetic metal such as SUS430 becomes magnetized by being placed in a magnetic field. In this state, the valves V13 and V14 are closed and the valves V11 and V12 are opened. Then, the pretreated sewage is introduced into the flow path 15 through the line L11 and flows through the flow path 15 upward in the figure. At this time, the flow rate of the sewage in the flow path 15 is adjusted to 0.2 m / s or less (here, 0.1 to 0.2 m / s) depending on how the valves V11 and V12 are opened. In this way, the sewage previously subjected to the pretreatment can be caused to flow through the flow path 15 and pass through the magnetized magnetic filter 19.

  In this collection step, the liquid component of the flowing sewage passes between the meshes of the magnetic filter 19 in the flow path 15. On the other hand, the magnetic filter 19 is attracted to the magnetic substance by being magnetized, so that the magnetic frog (magnetic substance) in the sewage is attracted to the metal wire constituting the net of the magnetic filter 19, and Will adhere to. At this time, since the flow rate of the sewage is 0.2 m / s or less, the force of the sewage to push the magnetic frog is weak, and the magnetic frog is sufficiently collected on the metal wire of the magnetic filter 19. In this way, a liquid component having a low magnetic frog content flows above the magnetic filter 19 in the flow path 15, and this liquid component flows from the apparatus 1 as treated water through the lines L <b> 12 and L <b> 2. Will be discharged.

(Regeneration process)
If the collection process as described above is continued, the magnetic frog accumulates on the metal wire of the magnetic filter 19, so that no new magnetic frog can be collected and the collection ability of the magnetic filter 19 is reduced. It will be. Therefore, in order to regenerate the collecting ability of the magnetic filter 19, the following regenerating process of the magnetic filter 19 is performed in order to remove the magnetic frog adhering to the metal wire.

  First, from the state where the collecting step is performed, the valves V11 and V12 are closed and the valves V13 and V14 are opened. Then, cleaning water (cleaning liquid) for cleaning the magnetic filter 19 is introduced into the flow path 15 through the line L13, and flows in the flow path 15 in the opposite direction (downward in the figure) to the collecting step. At this time, the current supplied to the superconducting electromagnet 3 is not changed, and the magnetic flux density of the magnetic field formed at the position of the magnetic filter 9 remains the same as in the collecting step (here, 0.5 T). At this time, the flow rate of the washing water in the flow path 15 is increased by, for example, four times or more than the flow rate of sewage in the collection step by the degree of opening of the valves V13 and V14, and 0.8 m / s or more (here Then, it adjusts so that it may become 1.0 m / s). In this way, the washing water can flow through the flow path 15 and pass through the magnetic filter 19. Here, a part of the treated water discharged from the line L2 by the collection step can also be used as the cleaning liquid. The flow rate of the washing water is preferably 2.0 m / s or less in consideration of the mechanical load on the flow pipe 17.

  In this regeneration step, flowing wash water passes between the meshes of the magnetic filter 19. At this time, the magnetic frog adhering to the metal wire of the magnetic filter 19 is attracted to the metal wire with the same suction force as in the collecting step, but the flow rate of the washing water is set to 0.8 m / s or more. Then, a force larger than the suction force of the metal wire is received from the washing water. For this reason, the magnetic frog adhering to the metal wire is wiped off against the suction force of the metal wire by the water pressure of the flowing wash water, and is removed from the metal wire. In this way, the collected magnetic frog is removed from the magnetic filter 19, and the collecting ability of the magnetic filter 19 is regenerated. In addition, cleaning water containing a large amount of magnetic frog flows below the magnetic filter 19 in the flow path 15, and this cleaning water flows from the apparatus 1 as cleaning water after filter cleaning through lines L14 and L4. Discharged.

  In this water treatment method, the above-described collection process for 5 minutes (300 seconds) and the above-described regeneration process for 5 seconds are set as one cycle, and these two processes are alternately performed in each of the flow paths 15, 25, 35, and 45. Repeated. That is, in this case, each of the flow paths 15, 25, 35, and 45 performs a regeneration process for recovering the collection ability of the magnetic filter 9 for 5 seconds out of one cycle of 305 seconds. Does not contribute to the removal of magnetic frogs in sewage. Therefore, in this water treatment method, the timings at which the regeneration steps are performed are set to deviate from each other so that the regeneration steps in the flow paths 15, 25, 35, 45 are not performed simultaneously. That is, when a regeneration process is performed in the flow path 15 at a certain time, for example, a regeneration process is performed in the flow path 25 after 75 seconds, and a regeneration process is performed in the flow path 35 after 75 seconds. A regeneration step is performed in the flow path 45 after a second. In this way, since the collection process and the regeneration process in each of the flow paths 15, 25, 35, 45 are repeated at different timings, the sewage introduced into the apparatus 1 is always at least 1 at all times. In one flow path, the magnetic substance is removed. Therefore, according to this water treatment method, it is possible to continuously treat sewage without stopping the introduction of sewage from the line L1 while maintaining the collection capability of the magnetic filter. Here, the regeneration process is always performed in three or four flow paths at all time points, and the processing capacity can be particularly enhanced.

  Also, according to this water treatment method, the magnetic flux density of the magnetic field formed at the position of each magnetic filter 19, 29, 39, 49 is not changed between the collection process and the regeneration process, so each magnetic filter 19 , 29, 39, 49 need not be moved between a place where the magnetic flux density is high and a place where the magnetic flux density is low. Therefore, water treatment can be performed without using large power for moving the magnetic filters 19, 29, 39, and 49, which are ferromagnetic materials, in the magnetic field. In addition, since the magnetic filters 19, 29, 39, and 49 are not taken in and out of the sewage between the collection process and the regeneration process, a seal structure for sealing the sewage is not necessary, and simple. The water treatment can be realized by the apparatus 1 having a simple structure.

[Second Embodiment]
A high gradient magnetic separation device 71 used in the water treatment method of the present embodiment will be described with reference to FIG. In the present embodiment, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The magnetic separation device 71 is different from the device 1 in the first embodiment in the configuration of four flow paths for flowing sewage, but the other configuration is the same as that of the device 1. FIG. 2 is a cross-sectional view of the flow paths 15a, 25a, 35a, and 45a in a plane orthogonal to the direction in which the sewage flows in the device 71. The device 71 includes one flow tube 57 surrounded by the superconducting electromagnet 3 instead of the four flow tubes 17, 27, 37, 47 (see FIG. 1) in the device 1. The internal space of the flow pipe 57 is partitioned into four regions having a fan-shaped cross section by four partition plates 58 extending in the direction in which sewage flows. The four areas divided into four equal parts constitute flow paths 15a, 25a, 35a, and 45a, respectively.

  In the flow paths 15a, 25a, 35a, 45a, magnetic filters 19a, 29a, 39a, 49a having fan-shaped cross sections are arranged, respectively. , All are magnetized with the same size. And each flow path 15a, 25a, 35a, 45a is connected to line L11-41, line L12-42, line L13-L43, and line L14-L44, respectively, so that four flow paths in the apparatus 1 Functions in the same manner as 15, 25, 35, and 45 (see FIG. 1). Therefore, the water treatment method similar to that of the first embodiment can be applied to the device 71 described above, and the same actions and effects as those of the first embodiment can be obtained.

[Third Embodiment]
A high gradient magnetic separation device 81 used in the water treatment method of this embodiment will be described with reference to FIG. In the present embodiment, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The magnetic separation device 81 is different from the device 1 in the first embodiment in the configuration of the magnetic field generation source for forming a magnetic field at the positions of the magnetic filters 19, 29, 39, and 49. Same as 1. The device 81 includes superconducting electromagnets 14, 24, 34, 44 arranged so as to surround the flow tubes 17, 27, 37, 47 instead of the superconducting electromagnet 3 of the device 1. Thus, the same water treatment method as that in the first embodiment can be applied to the device 81 in which the electromagnets are arranged one by one for each of the flow tubes 17, 27, 37, 47. Similar actions and effects can be obtained. Further, in this case, the magnetic fields generated by the superconducting electromagnets 14, 24, 34, and 44 may be set to the same magnetic flux density, so that the power supply devices that supply current to the electromagnets can be made common.

  Subsequently, in the first to third embodiments described above, the magnetic flux density B of the magnetic field generated at the position of the magnetic filters 19 to 39 or the magnetic filters 19a to 49a, the flow rate of sewage in the flow path in the collection step (hereinafter “ An example of the setting of Vf (referred to as “collection flow rate”) and the flow rate of cleaning water (hereinafter referred to as “regeneration flow rate”) Vr in the flow path in the regeneration step will be described. The present inventors conducted sewage treatment experiments for various magnetic flux densities B, collection flow rates Vf, and regeneration flow rates Vr using the test magnetic separation device 51 shown in FIG. The apparatus 51 used in this experiment is different from the apparatus 1 having four flow paths in that it has only one flow path 5, and the lines L1, L2, L3, and L4 of the apparatus 51 are branched. Without being directly connected to the flow path 5. Other configurations of the device 51 are the same as those of the device 1. This device 51 includes a magnetic filter 9 made of SUS430 and a flow pipe 7 having an inner diameter of 30 mm constituting the flow path 5, and the columnar magnetic filter 9 fixed to the inner wall of the flow path 5 has a wire diameter of a metal wire. About 100 sheets of 0.6 mm mesh and 1.2 mm mesh are stacked. Note that the values of the magnetic flux density B, the collection flow velocity Vf, and the regeneration flow velocity Vr set in the test apparatus 51 can be applied as they are even if the inner diameter dimension of the flow tube 7 is increased.

  In FIG. 5 obtained by the above-described experiment, a curve F indicates a relationship between the maximum collection flow velocity Vf and the magnetic flux density B for suitably collecting the magnetic substance in the collection step, and the curve R These show the relationship between the minimum regeneration flow velocity Vr and the magnetic flux density B for suitably recovering the limit collection time of the magnetic filter 9 in the regeneration process. According to FIG. 5, the maximum value of the collection flow velocity Vf suitable for the collection process and the minimum value of the regeneration flow speed Vr suitable for the regeneration process vary depending on the magnetic flux density B, and the magnetic flux density B suitable for the collection process. And the collection flow velocity Vf are hatched portions below the curve F in the graph, and the preferred combination of the magnetic flux density B and the regeneration flow velocity Vr in the regeneration process is above the curve R in the graph. The shaded area.

  That is, even when the magnetic filter 9 is in a magnetic field having the same magnetic flux density B, by setting the collection flow velocity Vf to a value lower than the curve F, a suitable magnetic substance is collected and regenerated. It was found that when the flow velocity Vr is set to a value higher than the curve R, the magnetic filter 9 is suitably regenerated. In setting the magnetic flux density B, the collection flow velocity Vf, and the regeneration flow velocity Vr in the water treatment method described above, first, an appropriate magnetic flux density B is selected, and the collection flow velocity Vf and regeneration corresponding to the magnetic flux density B are selected. It was found that if the flow velocity Vr is selected in the shaded area in the graph, both the collection process and the regeneration process can be suitably performed with the same magnetic flux density B.

  In view of the above, the present inventors conducted various experiments on the process of separating earth and sand from sewage, and as a result, the magnetic flux density B was set to 0.25 T or more and 1.0 T or less, and collected. By adopting a combination in which the flow velocity Vf is 0.2 m / s or less and the regeneration flow velocity Vr is 0.8 m / s, both the collection step and the regeneration step can be performed with the same magnetic flux density B. I understood.

  Further, even if the magnetic flux density B is made larger than about 0.5 to 0.75 T, the collection flow velocity Vf can hardly be increased, and the regeneration flow velocity Vr must be extremely increased. As the magnetic flux density B, it is preferable to adopt a value of 0.5T or more and 0.75T or less. Then, after setting the magnetic flux density B to 0.5 T or more and 0.75 T or less, referring to the hatched portion of the graph of FIG. 2, the collection flow velocity Vf is 0.2 m / s or less, and the regeneration flow velocity Vr. It was found to be particularly preferable to set the value to 1.2 m / s.

  In the apparatus 51, by selecting the combination of the magnetic flux density B, the collection flow velocity Vf, and the regeneration flow velocity Vr as described above, both the collection step and the regeneration step are preferably performed without changing the magnetic flux density B. It can be carried out. Further, the values of the magnetic flux density B, the collection flow velocity Vf, and the regeneration flow velocity Vr can be applied as they are even if the inner diameter dimension of the flow tube 7 is enlarged. Therefore, a combination of the above preferred values for the magnetic flux density, the collection flow rate and the regeneration flow rate in the flow paths 15, 25, 35, 45, 15a, 25a, 35a, 45a according to the first to third embodiments, It can be applied as it is.

  The present invention is not limited to the embodiment described above. For example, in the first to third embodiments, sewage treatment is performed using four flow paths. However, if the number of flow paths is plural, two or three may be used, and five or more. But you can. In the first to third embodiments, in order to remove non-magnetized earth and sand, the magnetic substance is removed after imparting magnetism to the earth and sand particles in the pretreatment step. The present invention can be applied to a magnetic separation method for removing a magnetic substance originally contained in a liquid to be treated without performing a pretreatment process.

It is a figure which shows 1st Embodiment of the magnetic separation apparatus with which the magnetic separation method and water treatment method which concern on this invention are applied. It is sectional drawing which shows the flow path of the magnetic separation apparatus in 2nd Embodiment. It is a figure which shows the magnetic separation apparatus in 3rd Embodiment. It is a figure which shows the magnetic separation apparatus for a test. It is a graph which shows the relationship between the magnetic flux density B, the collection flow velocity Vf, and the reproduction | regeneration flow velocity Vr in the water treatment method using the magnetic separation apparatus for a test.

Explanation of symbols

1, 51, 71, 81... High gradient type magnetic separation device, 5, 15, 25, 35, 45, 15a, 25a, 35a, 45a ... Flow path, 9, 19, 29, 39, 49, 19a, 29a, 39a, 49a ... Magnetic filters.

Claims (2)

A liquid to be treated containing a magnetic substance is caused to flow and passed through a magnetic filter located in a magnetic field formed therein, and the magnetic substance in the liquid to be treated is collected by the magnetic filter. A collection step for obtaining the removed treatment liquid, and a magnetic field having the same magnetic flux density as that of the collection step is formed at the position of the magnetic filter, and a cleaning liquid for cleaning the magnetic filter is introduced. And a regeneration step in which the cleaning liquid is caused to flow at a flow rate larger than that of the liquid to be treated in the collection step, and the magnetic substance collected in the magnetic filter is removed from the magnetic filter. Distributing and introducing the liquid to be treated into the road,
The collection process and the regeneration process are alternately performed for each flow path so that the magnetic substance is removed so that the collection process is performed in at least one of the flow paths. A magnetic separation method, wherein the treated liquid is obtained from each of the flow paths. Providing magnetism to the solid matter contained in the water to be treated to produce a magnetic substance,
Flowing the water to be treated containing the magnetic substance, passing it through a magnetic filter located in a magnetic field formed therein, and collecting the magnetic substance in the water to be treated by the magnetic filter, A collecting step for obtaining treated water from which the water is removed, and in a state where a magnetic field having the same magnetic flux density as the collecting step is formed at the position of the magnetic filter, introducing cleaning water for washing the magnetic filter, A plurality of flow paths in which the cleaning water is made to flow at a flow rate larger than the water to be treated in the collecting step, and the magnetic substance collected in the magnetic filter is removed from the magnetic filter. To distribute and introduce the treated water,
The collection process and the regeneration process are alternately performed for each flow path so that the magnetic substance is removed so that the collection process is performed in at least one of the flow paths. The treated water is obtained from each of the flow paths.

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