JP2003112180A - Water purification device - Google Patents

Abstract

(57) Abstract: Provided is a water purification device which prevents immobilization of foreign substances on a water filtration separation membrane and does not deteriorate water passage performance of the water filtration separation membrane. A filter means (15) for purifying the pretreatment water (12) by trapping and filtering a substance to be removed and a magnetic substance contained in the pretreatment water (12), and a substance to be trapped and deposited on the surface of the filtration means (15) And a cleaning means 31 for removing the magnetic substance from the filtration means 15 by washing the cleaning substance with the cleaning water, and a moving means 37 for moving the removed object and the magnetic substance onto the liquid surface of the pretreatment water 12. In the purification device, a flow path 98 through which the purified water 25 after being filtered flows is branched, and an electrolysis device 105 for electrolyzing the purified water 25 into acidic water and alkaline ionized water is provided in the branched flow path 98. A flow path 30 is provided for returning the acidic water generated by the electrolyzer 105 to the washing water 12 again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification device for water purification, solid-liquid separation and the like, and more particularly to a water purification device capable of continuously performing membrane separation of pollutant particles.

[0002]

2. Description of the Related Art Conventionally, as a purifying device for purifying water quality or solid-liquid separation, a fine wire net or a net woven with polymer fibers, a membrane formed by forming fine particles into a porous thin layer, or polymer fibers with Japanese paper There is known a purifying device that filters and removes particles by using the membrane bonded as described above as a water filtration separation membrane to form fine pores. The structure of this purification device is, for example, MOL Vol.22, No.12 p47
-51 (1984).

By constructing a film or net (hereinafter simply referred to as a film) from stainless steel thin wires or polyester fibers, the water in the water to be treated is, for example, from several microns to several tens to several hundreds of microns of the net or film. Although it is purified by passing through an opening with a meter opening, if the projected area (projected diameter) of water pollutants, organic matter, etc. is larger than the projected area or projected diameter of the opening, it naturally passes. It cannot be captured and separated. If water to be treated continues to flow through the same membrane surface as it is, substances to be treated will accumulate on the water-permeable side of the membrane, increasing water resistance, and the amount of water passing will be extremely reduced, impeding purification operations. .

Conventionally, in a water purifying apparatus in which the film surface is located below the liquid surface of the water to be treated, the film surface on which the deposits have accumulated is moved to the liquid surface of the water to be treated (atmosphere), and a shower shape is obtained. The membrane is cleaned and regenerated by spraying purified water, and the membrane surface is returned to below the liquid surface for use.

When it is necessary to separate fine pollutants smaller than the projected area (projected diameter) of the opening, vanadium sulfate, polyaluminum chloride or polyiron sulfate is previously added to the water to be treated as a coagulant. The mixture is mixed with other substances, and fine solid suspended matter in the raw water, algae, fungi, microorganisms, etc. are combined with a condensing agent to a size of several hundreds of micrometers to form so-called flocs. Therefore, since this floc cannot pass through the opening of the aperture of several tens of micrometers, it is captured and separated with a high removal rate, and purified water of higher water quality is obtained.

[0006] Further, JP-A-10-470, JP-A-10-328514, and JP-A-11-29085.
As described in Japanese Patent No. 4 etc., a technique for purifying bath water is also known.

[0007]

However, when a water filtration separation membrane is continuously (or intermittently) immersed in water for a long time, microorganisms, bacteria, juveniles, organic substances, inorganic substances and the like in the water pass through. It adheres to the water filtration separation membrane. As a result, aerobic organisms digest organic matter to form growth colonies, and sticky substances generated from microorganisms immobilize inorganic substances on a water filtration separation membrane and block the openings of the membrane. Therefore, the water-passing performance of the water-passing filtration separation membrane is lowered, and the purification treatment ability is lowered.

Especially, when the target raw water to be purified is a effluent of a lake, river, reservoir, seawater containing a large amount of organic matter such as plankton, or sewage containing bacteria etc. And reduce the amount of purified water. In such a case, conventionally, a method of washing the membrane with a strong alkaline liquid such as sodium hydroxide to remove microorganisms has been adopted. However, such a method requires a facility for separately storing the used alkaline aqueous solution, adding an acid to neutralize the environment and then discarding the sludge in order not to pollute the environment. Further, the technique described in the publication does not consider performing the cleaning operation during the cleaning process.

An object of the present invention is to immobilize foreign matter to the water filtration / separation membrane by ionizing a part of the wash water of the water filtration / separation membrane so that the wash water has a sterilizing action and an aggregating action. It is to provide a water purifying device that prevents the deterioration of the water permeation performance of the water permeation filtration separation membrane, and that can perform the water purifying operation while performing the cleaning process.

[0010]

In order to achieve the above-mentioned object, the invention of a water purification apparatus according to the present invention provides a method for capturing pre-treated water by capturing and filtering substances to be removed and magnetic substances contained in the pre-treated water. Filtering means for purifying, cleaning means for removing the object to be removed and magnetic substance trapped and deposited on the surface of the filtering means from the filtering means by washing with wash water, and the object to be removed and magnetic substance to be removed In a water purifying apparatus comprising a moving means for moving the above-mentioned pretreated water on the liquid surface,
The flow path of the purified water after filtering is branched, and an electrolyzer for electrolyzing the purified water into acidic water and alkaline water is provided in the branched flow path. A flow path for returning the acidic water to the washing water is provided.

In order to achieve the above-mentioned object, another invention of the water purifying apparatus according to the present invention is a filtering means for purifying the pretreated water by capturing and filtering substances to be removed and magnetic substances contained in the pretreated water. And a cleaning means for separating the object to be removed and the magnetic substance trapped and accumulated on the surface of the filtering means from the filtering means with cleaning water, and the separated object to be removed and the magnetic substance moved to the liquid surface of the treated water. In the water purifying apparatus including a moving unit for moving the filtered purified water, the flow path of the filtered purified water is branched, and the branched flow path is electrolyzed to electrolyze the purified water into acidic water and alkaline ionized water. A device is provided, and a flow path for joining the alkaline water generated by the electrolyzer with the filtered purified water is provided.

In order to achieve the above-mentioned object, still another invention of the water purifying apparatus according to the present invention is a filtration for purifying the pretreated water by capturing and filtering substances to be removed and magnetic substances contained in the pretreated water. Means, a cleaning means for separating the object to be removed and the magnetic substance trapped and deposited on the surface of the filtering means from the filtering means with cleaning water, and the separated object to be removed and the magnetic substance to the liquid surface of the treated water. In a water purifying apparatus including a moving means for moving, a flow path through which the purified water after the filtration flows is branched, and an electricity for electrolyzing the purified water into acidic water and alkaline water With a disassembly device,
A flow path is provided for joining the alkaline water generated by the electrolyzer with the pretreated water.

Preferably, the branched flow path is provided with a means for pressurizing the purified water flowing to the electrolyzer and a flow rate adjusting valve for adjusting the flow rate of the purified water flowing to the electrolyzer.

Further, the electrolyzer also supplies a part or all of the electric power with the electric power generated by the solar cell. Further, the fuel cell power generation means is provided for chemically reacting hydrogen gas generated in the electrolyzer with oxygen in the air and generating power by this chemical reaction.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a usage state of a water purifying apparatus according to the present invention, FIG. 2 is an enlarged transverse sectional view of a main part of the water purifying apparatus, and FIG. 3 is a sectional view taken along line XX of FIG. A partial plan view is shown. As shown in FIG. 1, raw water is passed from a reservoir 1, for example, through a pipe 2 and a filter 3 for removing large dust, and then pumped up to a raw water storage tank 5 by a pump 4, and the raw water 6 is fed from a seeding agent adjusting device 7 to the raw water 6. , Magnetic powder such as ferric tetroxide, pH adjusting agent, flocculant that separates into aluminum ion or iron ion of aqueous solution of polyaluminum chloride, iron chloride, ferric sulfate, etc.
A polymer reinforcing agent or the like is added through the pipe 8. Stirring tank 9
Then, the magnetic powder, the pH adjuster, the coagulant, the polymer reinforcing agent, and the like are agitated by the stirring blade 11 that rotates with the rotation of the motor 10 to have a size of several hundreds of micrometers to several millimeters. The pretreated water 12 containing so-called magnetic flocs is prepared. The pretreated water 12 is sent to the membrane magnetic separation device 14 through the pipe 13 as shown by an arrow A.

The structure of the film magnetic separation device 14 will be described in detail with reference to FIGS. A membrane 15 (filtering means) having openings of several micrometers to several tens of micrometers is formed in a drum shape from stainless steel thin wires, copper thin wires or polyester fibers. Both ends of the membrane 15 are joined to drum-shaped shells 16 and 17 having no openings. One end (lower end in the drawing) is joined and integrated with the flange 18, and the motor 20 is attached to the central portion of the flange 18 via the rod 19, and as the motor 20 rotates, the flange 18, the shell 16, Drum-shaped membrane 15,
The shell 17 is configured to rotate.

The shell 17 and the fixed flange 21 are watertightly integrated by joining. The nozzle 28, which is integrated with the fixed flange 21 by welding, adhesion, or the like, has ring-shaped sliding bodies 22 and 23 made of a polymer material having a low sliding resistance.
Supported by the casing 27 while maintaining watertightness at
The rotation center of the fixed flange 21 does not move.

In the casing 27 forming the purified water tank,
Membrane 15 is attached. Pretreated water 12 is pipe 1
3 flows into the casing 27 and passes through the membrane 15.
At this time, the magnetic flocs 24 contained in the pretreated water 12 are captured on the outer surface of the film 15. Magnetic flock 2 passing through the membrane 15
The pretreated water 12 from which 4 has been separated becomes purified water 25, and arrow B
As shown in FIG. 5, water is stored in the purified water tank 29 through the nozzle 28, is returned from the nozzle 96 through the pipe (flow path) 26 to the water reservoir 1 again. The power of the pretreated water 12 passing through the membrane 15 is the difference in liquid level between the pretreated water 12 and the purified water 25.

On the other hand, in FIG. 2, the magnetic flocs 24 are filtered and adhered by passing water from the outer surface of the membrane 15 which rotates clockwise, and become a deposit and rotate and move near the water surface. A part (about 5%) of the purified water 25 is guided to a pump 99 by a pipe 98 from a nozzle 97 branched from the pipe 26 provided in the purified water tank 29, and is pressurized to be wash water. The pressurized cleaning water has a cleaning flow rate adjusted by a flow rate adjusting bypass valve 101 installed in the middle of the pipe 100 and a flow adjusting valve 103 installed in the middle of the pipe 102.
The shower water 32 is sent from the pipe 30 to the shower pipe 31 (cleaning means), and shower water 32 is sprayed from the inner surface of the membrane 15 toward the outer surface side.

An electrolyzer 105 is provided in the middle of the pipe 104.
Is placed, and a part of the washing water is guided to the electrolyzer 105. The flow rate introduced into the electrolyzer 105 is adjusted by the flow rate adjusting valves 106 and 103. The washing water introduced into the electrolyzer 105 is electrolyzed to generate alkaline ionized water containing a large amount of OH negative ions in the anode (not shown), and the alkaline ionized water is supplied to the pipe 10
7 is connected to the pipe 26 via the flow rate adjusting valve 108 and returned to the reservoir 1. On the other hand, acidic water containing a large amount of H positive ions is generated at the cathode (not shown), and the acidic water is supplied from the pipe 104 to the pipe 3
0 to mix acidic water in the wash water. The deposits accumulated on the inner surface of the film 15 are separated by the shower water 32 sprayed from the inner surface, the surface of the film 15 is regenerated by separating the deposits, and the magnetic flocs 24 float on the surface of the pretreatment water 12. To do. At the same time, shower water 32
The membrane 15 is washed with the inside acidic water, and microorganisms such as bacteria attached to the membrane 15 are sterilized by the sterilizing action of the acidic water, and the microorganisms are prevented from propagating on the membrane 15. Also,
By preventing the microorganisms from propagating, the generation of a mucous body fluid generated from the body by the microorganisms is eliminated, and as a result, it is possible to prevent the polluted fine particles from being trapped and fixed on the membrane 15 by the body fluid. The pipe 30 is fixedly supported from the casing 27 by a support tool (not shown). The magnetic flocs 24 separated from the film 15 and floating on the water surface are, for example, the permanent magnet 35 having a surface magnetic field strength of 0.5 Tesla and the support body 3.
When approaching the magnetic field generating means configured by 6, the magnetic field is attracted by a magnetic gradient outside the magnetic field generating means and moves toward the permanent magnet 35. The moved magnetic flock 38 adheres to the surface of the thin shell 37 of the non-magnetic stainless steel or plastic rotating body that rotates outside the magnetic field generating means. In the figure, the magnetic flocs 38 attached on the shell 37 (moving means) rotating counterclockwise are exposed to the atmospheric portion of the water surface. At this time, excess water in the magnetic flocs 38 is gravity-separated and flows down or drops from the surface of the shell 37, so that the magnetic flocs 38 are concentrated to a water content of about 95%. The same effect can be obtained by using a coil type normal conducting magnet, a coil type superconducting magnet, a superconducting bulk magnet or the like instead of the permanent magnet 35. The shell 37 has its end portion joined to a flange 39, and a rod 40 joined to this flange 39 is rotationally driven by a motor 41. The rod 40 is supported by the casing 27 while maintaining watertightness by an O-ring 43. The motor 41 is fixedly supported by the casing 27 by means not shown. The other end of the shell 37 is rotatably supported by the casing 27 while maintaining watertightness by an O-ring 43, and the inside of the shell 37 is open to the atmosphere. The permanent magnet 35 is fixedly supported by bolts or the like from the atmosphere side through the support member 44 with a slight gap with respect to the casing 27. With this structure, the magnetic field generating means can be easily arranged freely from outside the casing 27.

The concentrated magnetic flocs 38 on the surface of the shell 37 rotate together with the shell 37, and the magnetic attraction force becomes smaller as the magnetic flocs 38 move away from the magnetic field generating means, and the shell 37 is removed by a flat plate-like spatula 42 as scraping means. It is separated from the surface and separated and collected as sludge in the sludge tank 43. The sludge in the sludge tank 43 is the sludge tank 4
A group of scraping plates 44 arranged at the lower part of 3 and a rod 45 connected thereto are rotated by a motor 46, transferred to the upper side in the drawing, and discharged from an outlet 47. The discharged sludge is stored in the sludge tank 49 through the pipe 48 (see FIG. 1). The sludge stored in the sludge tank 49 is
A centrifuge or a centrifuge before transporting or composting so that the water content is about 85%, and the water content is about 75% so that the microorganisms that decompose organic matter during composting can be activated. It is concentrated by a dehydrating means 50 such as a belt press. The sludge is transported to a disposal site or an incineration site by, for example, a truck, and a composting tank 51 is provided after the dewatering means 50 and is transferred to the composting tank 51 through a flow path 52 to be composted. After composting, the compost can be crushed into powder, and the magnetic powder and the generated magnetic substance in the fertilizer can be recovered by a magnetic separator (not shown) and reused.

Side walls 53 are attached to both sides of the spatula 42,
It prevents sludge from falling into the casing 27.
The side wall 53 and the spatula 42 are watertightly attached to the casing 27, and the spatula 42 is a spring or the like (not shown).
The tip is elastically pressed against the surface of the shell 37. The tip of the spatula 42 is made of, for example, hard rubber or the like.

A partition wall 54 of non-magnetic material fixedly supported by the casing 27 is arranged so that the water flow of the shower water 32 does not impinge on the surface of the shell 37 and the magnetic flocs 38 do not contain water again. In addition, a partition wall 55 of a non-magnetic material fixedly supported by the casing 27 is provided below the shell 37.
Is arranged to prevent the magnetic flocs 38 separated from the film 15 by the shower water 32 from moving away from the separation place. As a result, the magnetic flocs 38 float in the generated magnetic field, are magnetically attracted again, and are magnetically captured on the surface of the shell 37.

Further, the purified water in the membrane 15 is sucked in from the intake port 57 of the pump 56, passes through the pipe 58, and the shower pipe 5
9, high pressure shower water 60 is sprayed from the inner surface of the film 15 to the outer surface side through the holes. The deposits remaining and accumulated on the outer surface of the film 15 are peeled off by shower water, the surface of the film 15 is regenerated, and the cleaning water containing the deposits is stored in the tray 61 provided outside. The accumulated cleaning water flows from the drain port 62 as shown by an arrow C (see FIG. 1), the pump 63, and the pipe 6
It is returned to the upstream side of the raw water storage tank 5 through 4 and re-magnetized to be recovered as sludge by the membrane magnetic separation device 14.

The water level of the pretreated water 12 is processed by the signal of the ultrasonic liquid level gauge 200 and taken into the liquid level control device 201, and when the liquid level rises above a predetermined value, it is rotated by the power line 202. The number of rotations of the motor 20 controlled by the number is increased, the residence time of the membrane 15 in the pretreated water 12 is shortened, the filtration treatment amount of the membrane 15 is increased, and the water level of the pretreated water 12 is lowered. On the contrary, if the liquid level drops below the specified value, the motor 2
The number of rotations of 0 is reduced, the residence time of the membrane 15 in the pretreated water 12 is lengthened to reduce the filtration treatment amount of the membrane 15, and the water level of the pretreated water 12 is increased. Here, the operation of generating acidic water by the electrolyzer 105 may be continuous, or may be a method of intermittently and periodically operating with a timer or the like. The power for electrolysis is the solar cell 10.
9, may receive from the power line 110, for this reason a storage battery (not shown) is mounted on the electrolyzer 105, and the solar cell 109
It is also possible to store the electric power from the battery and discharge it in the rain to perform electrolysis. Further, alkaline ionized water is joined from the pipe 107 to the pipe 113 via the valve 112, and the unaggregated suspended particles in the pretreated water 12 are aggregated in advance by the aggregation action of the alkaline ionized water, whereby the suspended particles form a film. It is possible to prevent the adhesion to 15. further,
Valve 11 for alkaline ionized water from pipe 107 to raw water storage tank 5
2. It is possible to reduce the amount of the coagulant supplied from the seeding agent adjusting device 7 by causing the particles to join through the pipe 113 to coagulate a part of the suspended particles in the raw water by the coagulation action of the alkaline ionized water. Further, hydrogen gas generated from the cathode of the electrolysis tank 105 is led to a fuel cell 206 through a pipe 205, where it chemically reacts with oxygen in the atmosphere to generate electricity, and is supplied to the electrolysis tank 105 having a power storage function by an electric wire 207. Then, the hydrogen generated in the electrolysis tank 105 can be effectively used. By effectively using hydrogen in this way, there is an effect that the power consumption of the electrolysis tank can be reduced, and there is also an effect that the danger of hydrogen explosion or the like can be prevented by not releasing the hydrogen gas outside the apparatus. According to the present embodiment described above, a part of the washing water is introduced into the electrolysis tank and electrolyzed, and alkaline ionized water containing a large amount of OH ions on the anode side and acidic water containing a large amount of H ions on the cathode side. By mixing the acidic water having a sterilizing action with the wash water again and continuously or periodically washing the water filtration separation membrane with the wash water, the sterilizing action of the acidic water can be achieved while purifying the water. Microorganisms such as bacteria attached to the membrane can be sterilized to prevent the microorganisms from propagating. Further, by preventing the microorganisms from propagating, the generation of mucous body fluid generated from the body by the microorganisms is eliminated, and it is possible to prevent the polluted fine particles from being trapped and fixed on the net by the body fluid. As a result, it is possible to prevent immobilization of foreign matter on the water filtration / separation membrane, prevent clogging of the membrane, and prevent deterioration of water permeability of the water filtration / separation membrane.

The alkaline ionized water, which has the effect of preventing the adherence of suspended particles in water, is returned to the wash water and mixed, and the water filtration separation membrane is continuously or periodically washed with the wash water to form a membrane. It is possible to prevent clogging and prevent the deterioration of the water flow performance of the water filtration separation membrane.

On the other hand, this alkaline ionized water is effective as active water in the body for organisms larger than microorganisms such as fish, and when mixed with purified water, fish in lakes and rivers that release purified water. It also has the effect of promoting the growth of organisms such as.

Further, by covering the electric power used for electrolysis with the electric power generated by the solar cell, it is possible to generate a large amount of electric power when the sunshine intensity is high, and a large amount of acidic water can be obtained. At this time, since the activity of the microorganisms is also active, there is an effect that the bactericidal action can be increased according to the activity time zone of the microorganisms, and the power consumption can be saved. In addition, in the above-mentioned embodiment, the purifying device in which the membrane filtration separation and the magnetic separation are combined has been described, but in the purification device having the membrane filtration separation, the membrane is used as tap water or a part of the purified water as washing water for the membrane. It can be applied to a purification device for purification of factory wastewater, purification of sewage, etc., and similar effects can be obtained.

[0029]

As described above, according to the present invention, a part of the wash water of the water filtration separation membrane is ionized to give the wash water a sterilizing action and a coagulating action, thereby performing a water purification operation. While preventing the immobilization of foreign matter on the water filtration membrane
It is possible to obtain a water purification device in which the water-passing performance of the water-passing filtration separation membrane does not deteriorate.

[Brief description of drawings]

FIG. 1 is a diagram showing a usage situation of a water purification apparatus according to the present invention.

FIG. 2 is an enlarged transverse cross-sectional view of a main part of the water purification device.

3 is a cross-sectional view taken along line XX of FIG. 2 and is a partial plan view.

[Explanation of symbols]

1 ... Reservoir, 3 ... Filter 4, 63, 99 ... Pump, 5
... Raw water storage tank, 7 ... Seeding agent adjusting device, 9 ... Stirring tank, 10, 20, 41, 46 ... Motor, 11 ... Stirring blade,
12 ... Pretreated water, 14 ... Membrane magnetic separation device, 15 ... Membrane (filtering means), 16, 17, 37 ... Shell, 18, 39 ... Flange, 24, 38 ... Magnetic floc, 25 ... Purified water, 2
7 ... Casing, 28 ... Nozzle, 29 ... Purified water tank, 3
1, 59 ... Shower pipe (cleaning means), 32, 60 ... Shower water, 35 ... Permanent magnet, 36 ... Support, 42 ... Spatula,
43 ... Sludge tank, 51 ... Composting tank, 61 ... Tray, 1
01 ... Flow control bypass valve, 103, 106, 108
... Flow rate adjusting valve, 105 ... Electrolyzer, 109 ... Solar cell, 200 ... Ultrasonic level gauge, 201 ... Liquid level control device, 2
06 ... Fuel cell.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Mizumori             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center F-term (reference) 4D006 GA02 HA93 KA01 KA13 KA33                       KB14 KC03 KC13 KC16 KC17                       KD08 KD11 KD30 MA03 MB02                       MC48 PA01 PB08 PB22                 4D061 DA02 DB07 DB08 EA02 EB02                       FA09

Claims (6)

[Claims] 1. Filtering means for purifying the pretreated water by capturing and filtering substances to be removed and magnetic substances contained in the pretreated water,
Cleaning means for separating the object to be removed and the magnetic substance trapped and deposited on the surface of the filtering means from the filtering means by cleaning with cleaning water, and the separated object to be removed and the magnetic substance to be removed from the pretreatment water. In a water purifying apparatus including a moving unit that moves the liquid to a liquid surface, a flow path through which the purified water after the filtration flows is branched, and the purified water is divided into acidic water and alkaline water in the branched flow path. A water purifying device comprising: an electrolyzer for electrolyzing, and a flow path for returning the acidic water produced by the electrolyzer to the washing water. 2. A filtering means for purifying the pretreated water by capturing and filtering substances to be removed and magnetic substances contained in the pretreated water,
Cleaning means for separating the object to be removed and the magnetic substance trapped and deposited on the surface of the filtering means from the filtering means with cleaning water,
In a water purifying apparatus comprising a moving means for moving the removed object to be removed and the magnetic substance to the liquid surface of the treated water, a flow path through which the purified water after the filtration flows is branched, and the branched flow path Is provided with an electrolyzer for electrolyzing purified water into acidic water and alkaline water, and a flow path is provided for joining the alkaline water produced by this electrolytic device with the filtered purified water. A water purification device characterized in that. 3. Filtering means for purifying the pretreated water by capturing and filtering the substances to be removed and magnetic substances contained in the pretreated water,
Cleaning means for separating the object to be removed and the magnetic substance trapped and deposited on the surface of the filtering means from the filtering means with cleaning water,
In a water purifying apparatus comprising a moving means for moving the removed object to be removed and the magnetic substance to the liquid surface of the treated water, a flow path through which the purified water after the filtration flows is branched, and the branched flow path In the above, an electrolyzer for electrolyzing purified water into acidic water and alkaline water is provided, and a channel for joining the alkaline water generated by the electrolytic apparatus with the pretreated water is provided. Water purification device. 4. A means for pressurizing the purified water flowing into the electrolyzer and a flow rate adjusting valve for adjusting the flow rate of the purified water flowing into the electrolyzer are provided in the branched flow path. The water purifier according to any one of 1 to 3. 5. The water purifier according to claim 1, wherein a part or all of the electric power of the electrolyzer is covered by electric power generated by a solar cell. 6. The fuel cell power generation means for chemically reacting hydrogen gas generated in the electrolyzer with oxygen in the air to generate electricity by the chemical reaction, according to claim 1. Water purification equipment.