JP2000116278A - Water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purifier capable of removing phosphoric acid in water in the water tank. SOLUTION: This water purifier D1 is such as to be equipped with a water tank 1 for raising fishes-and-shellfishes or the like, a filtration tank 10 located above the water tank 1, a water holding tank 2 located in parallel with the filtration tank 10, a sedimentation tank 40 set up on the downstream side of the water holding tank 2, a set of electrodes 4, a direct current source for supplying electric current to the electrodes 4, an electrode holder 5, a pumping pipe 6, a pump 7, an issue valve 41 as an electromagnetic valve, and a return pipe 12; wherein the water holding tank 2 is intended to remove phosphoric acid in the water in the tank 1; and the electrodes 4, each of which is made of a rectangular iron plate, serve to leach out iron ions by the aid of electrolysis so as to remove the above-mentioned phosphoric acid, and the iron ions thus leached out react with the phosphoric acid and then flocculate as water-insoluble phosphorus compounds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water purification device,
More specifically, the present invention relates to a water purification device for purifying water in an aquarium by removing organic matter such as manure and residual food from living things (such as seafood, turtles and aquatic insects) bred in the aquarium.

[0002]

2. Description of the Related Art Conventionally, in a water tank for breeding creatures, whenever the water quality deteriorates, the water in the water tank is replaced or a water purification device is provided, and the water quality is purified by the purification device. I am trying to do it.

In the latter case, the water purification device is
Equipped with a filtration tank, pump water from the water tank into this filtration tank with a circulation pump, etc., and filter through the filtration tank (physical filtration and biological filtration)
It is known that the water is returned to a water tank after the water is discharged. Such a water purification device can remove organic substances such as manure and residual food from fish and shellfish, and other substances such as ammonia.

[0004]

However, in such a water purifying apparatus, phosphoric acid increases in the water in the water tank due to the organic matter. Then, algae and aquatic plants are generated in the water tank, and these adhere to the wall surface of the water tank.

[0005] For this reason, not only is it difficult to observe and appreciate the bred fish and the like, but also the dissolved oxygen in the water is reduced, which may cause an oxygen deficiency state. In addition, there is a problem that it is necessary to frequently remove algae and aquatic plants or exchange water, which is troublesome.

[0006] The present invention has been made in view of such circumstances, and an object thereof is to provide a water purification device capable of removing phosphoric acid contained in water in a water tank.

[0007]

According to one aspect of the present invention, there is provided a water tank for breeding an organism, a filtration tank having a filter for containing water in the water tank and filtering organic matter in the water, and the filtration tank. A water storage tank, which is juxtaposed with and stores water in the water tank,
Ion supply means for supplying ions for precipitating and removing phosphoric acid in water to the water in the water storage tank, transfer means for transferring water in the water tank to the filtration tank and the water storage tank, and purification by the filtration tank. And a return means for returning the purified water and the water purified in the water storage tank to the water tank.

[0008] The tank is filled with seawater or freshwater for breeding creatures (such as seafood, turtles and aquatic insects). As a filter for the filtration tank, for example, a needle punch type nonwoven fabric made of polypropylene as a raw material is preferably used. The water storage tank is disposed outside, such as above or on the side of the water tank, and stores water in the water tank.

The ion supply means supplies ions in the water in the water storage tank for precipitating and removing phosphoric acid in the water, for example, iron ions or aluminum ions.
It is arranged inside or outside the water storage tank. As an example disposed inside, there is at least one set of electrolysis electrodes as described below. One example of an external arrangement includes an electrolysis tank disposed above a water storage tank, an electrode for electrolysis immersed in the electrolysis tank, and ions eluted into the electrolysis tank. Some include an introduction pipe for introducing water into a water storage tank.

[0010] The transfer means directly transfers the water in the water tank to the water storage tank.
Alternatively, the water is transferred indirectly through another component, and for example, a pump including a pump and a pump for pumping water in a water tank is used.

The return means is for returning water from the water storage tank directly to the water tank or indirectly via other components, for example, for returning water purified in the water storage tank to the water tank. Return pipe is used.

According to another aspect of the present invention, a water tank for breeding an organism, a filter tank having a filter for containing water in the water tank and filtering organic matter in the water, and a water tank arranged in parallel with the filtration tank A water storage tank for storing water, at least one set of electrodes that is disposed in the water storage tank and elutes iron ions or aluminum ions for precipitating and removing phosphoric acid in water by electrolysis, and the electrodes Power supply for supplying water to the water tank, transfer means for transferring water in the water tank to the filtration tank and the water storage tank, and return means for returning water purified by the filter tank and water purified by the water storage tank to the water tank. A water purification device is provided.

[0013] The electrodes are, for example, rectangular plates and are arranged in a predetermined pair of two, and elute iron ions or aluminum ions into the water storage tank by electrolysis. A power supply supplies a current for electrolysis to each set of electrodes.

One set of electrodes is, for example, both iron (or aluminum) electrodes, or one is an iron (or aluminum) electrode and the other is an insoluble metal electrode. In the former case, the passivation of the electrode can be prevented by inverting the polarity of the electrode as desired. In the latter case, an iron (or aluminum) electrode is used as an anode, and an insoluble metal electrode is used as a cathode. Here, examples of the insoluble metal electrode include a silver electrode and a platinum electrode. Further, it is preferable that the pair of electrodes is fixed to, for example, an electrically insulative electrode holder, and the interval between the electrodes is kept constant.

Iron ions or aluminum ions eluted into the water storage tank by electrolysis react with phosphoric acid (orthophosphoric acid) in water to form a water-insoluble phosphorus compound (Fe (O
H) _x (PO ₄ ) _y or Al (OH) _x (P
O ₄ ) _y ) and aggregate, and partly settles and accumulates in the water storage tank. The deposited phosphorus compounds are periodically discarded.
Therefore, the phosphoric acid in the water in the water tank can be removed by the water storage tank.

In the water purifying apparatus according to the present invention, more preferably, the transfer means has a control means for controlling the water in the water tank to be transferred only to the filtration tank or to the filtration tank and the water storage tank. .

By the transfer means having such control means, the water in the water tank is appropriately transferred to only the filtration tank or to the filtration tank and the water storage tank.

[0018] The water purification apparatus according to the present invention is more preferably provided with a distribution tank having a first inlet communicating with the filtration tank and a second inlet communicating with the water storage tank, and transferring the water in the water tank. It is transferred into the distribution tank by means. The first inlet of the distribution tank is for introducing water in the water tank to the filtration tank, and the second inlet is for introducing water in the water tank to the water storage tank.

If such a distribution tank is provided, the filtration in the filtration tank and the ion supply to the water storage tank or the electrolysis in the water storage tank can be performed in parallel. .

[0020] The water purification apparatus according to the present invention is more preferably provided with a supply means for supplying the water purified in the filtration tank to the return means and the water storage tank. When such a supply means is provided, part of the water purified by the filtration tank is returned to the water tank by the return means, and another part is introduced into the water storage tank to supply the ion or the water. It will undergo electrolysis.

[0021] In the water purification apparatus according to the present invention, more preferably, a sedimentation tank for precipitating the water-insoluble phosphorus compound generated by the reaction with the phosphoric acid is provided between the water storage tank and the returning means. Can be

With the water purification apparatus configured as described above, the phosphorus compound not precipitated in the water storage tank can be almost completely precipitated in the precipitation tank.

[0023] The water purification apparatus according to the present invention further preferably further comprises a decolorizing section for removing a colored water-insoluble phosphorus compound generated by a reaction with phosphoric acid between the water storage tank and the returning means. Is provided.

As the decolorizing part, for example, a decolorizing tank containing a filter for removing phosphorus compounds is used.
Here, as the filter, for example, in addition to the nonwoven fabric, a length of about 10 mm made of polypropylene resin,
Many circular pipes with an outer diameter of about 6 mm and an inner diameter of about 3 mm,
Aggregates are preferably used.

[0025] With the water purification apparatus configured as described above, it is possible to easily remove the phosphorous compound as well as the colored phosphorus compound.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, three embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by these.

Embodiment 1 As shown in FIGS. 1 to 3, a water purification device D _{1 according} to Embodiment 1 of the present invention includes a water tank 1 and a filtration unit as a filtration unit disposed above the water tank 1. The tank 10, a water storage tank 2 provided in parallel with the filtration tank 10, a sedimentation tank 40 provided downstream of the water storage tank 2, a set of electrodes 4 and 4, A DC power supply (not shown) for supplying a current, an electrode holder 5, a pumping tube 6 and a pumping pump 7 as transfer means,
It comprises a discharge valve 41 composed of an electromagnetic valve as control means and a return pipe 12 as return means.

The aquarium 1 is for rearing fish and shellfish and the like, and is formed of a box having a substantially rectangular planar shape. Filtration tank 1
Numeral 0 is provided on a first path from the pumping pipe 6 to the return pipe 12, and is mounted on an inner lid 8 covering the opening edge of the water tank 1. The filtration tank 10 is for introducing water in the water tank 1 through the suction pipe 6 and the suction pump 7, and for performing physical filtration and biological filtration of organic matter in the water such as manure and remaining food of fish and shellfish, and for performing filtration. The filter 11 is built in. The filter 11 is made of a needle-punch type sheet-shaped nonwoven fabric made of polypropylene as a raw material (for example, the basis weight: 400 g /
m ² , thickness 4.0 mm, air permeability 160 cc / cm ² / s
ec) is a laminate of a plurality of sheets.

The water storage tank 2 is for removing the phosphoric acid in the water in the water tank 1 and has a second path from the pumping pipe 6 to the return pipe 12 (parallel to the first path). ), And is placed on an inner lid 8 that covers the opening edge of the water tank 1. The water in the water tank 1 is pumped into the water storage tank 2 by the suction pipe 6, the pump 7 and the discharge valve 41.

A pair of electrodes 4 in the water storage tank 2 are
Each of them is a rectangular plate-like iron plate, and elutes iron ions for removing phosphoric acid in water by electrolysis. The electrode holder 5 has an electrical insulation property, is attached to the upper ends of the electrodes 4, and keeps a constant distance between them.

The iron ions eluted into the water storage tank 2 by the electrolysis react with phosphoric acid (orthophosphoric acid) in water to form a water-insoluble phosphorus compound (Fe (OH) _x (PO ₄ ) _y ) and agglomerate. Some of them float in water, and the other precipitates and accumulates in the water storage tank 2.

The sedimentation tank 40 is for sedimenting the water-insoluble phosphorus compound generated by the reaction between the iron ions or aluminum ions eluted in the water storage tank 2 and the phosphoric acid in the water storage tank 2 subsequently.

The return pipe 12 is provided with a filtration tank 10 and a settling tank 40.
Provided in a state penetrating the inner lid 8 adjacent to the filter tank 1.
This is for returning the purified water that has passed through the settling tank 40 to the water tank 1.

The discharge valve 41 is for switching the water in the water tank 1 pumped by the pumping pipe 6 and the pump 7 to the filter tank 10 alone or to the filter tank 10 and the water storage tank 2 by switching. Here, the discharge valve 41 is 1
It is opened about once a day for a certain period of time, and the water in the water tank 1 pumped out is discharged to the filtration tank 10 and the water storage tank 2.

In FIG. 1 to FIG. 3, reference numeral 13 denotes an outer lid which covers the edge of the end wall of the inner lid 8, which is a filtration tank 10, a water storage tank 2, a sedimentation tank 40, a pumping tube 6, a pumping pump. 7. The return pipe 12 is covered. Reference numeral 16 denotes a strainer connected to the pumping pipe 6, and reference numeral 21 denotes a gravel layer disposed at the bottom of the water tank 1.

Reference numeral 17 denotes an aeration tube provided at the bottom of the water storage tank 2. The aeration pipe 17 supplies compressed air from the air supply blower 18 disposed outside the water storage tank 2 to the bottom of the water storage tank 2 through the air supply pipe 19, and the electrodes 4, 4 are generated by generated bubbles.
Wash the surface. Reference numeral 20 denotes a control unit, which controls the driving of the pump 7 and the blower 18 and controls the electrolysis of the water storage tank 2.

Reference numeral 42 denotes a drainage pump provided in the sedimentation tank 40 for pumping out supernatant water from the sedimentation tank 40 and guiding it to the return pipe 12.

[0038] The flow sheet of water purification process in the constructed water purification apparatuses D ₁ as described above is shown in FIG.

Embodiment 2 As shown in FIGS. 5 to 7, a water purifying apparatus D _{2 according} to Embodiment 2 of the present invention comprises a water tank 1 and a filter as a filtration unit disposed above the water tank 1. A tank 10, a water storage tank 2 provided in parallel with the filtration tank 10, a decolorization tank 3 provided downstream of the water storage tank 2, a set of electrodes 4.4, and an electrode 4.4. A DC power supply (not shown) for supplying current, and an electrode holder 5
, A pumping tube 6, a pumping pump 7, and a return tube 12.

The decolorizing tank 3 is for removing the colored phosphorus compound which floats in the water and flows through the advancing port 2a of the water storage tank 2, and is provided adjacent to the water storage tank 2. And a filter 9 for removing the phosphorus compound and performing biological filtration. The filter 9 is made of polypropylene resin and has a length of about 10 mm, an outer diameter of about 6 mm,
A large number of hollow cylinders having an inner diameter of about 3 mm are stored in a bag.

The filtration tank 10 and the water storage tank 2 are respectively provided with a first path and a second path from the pumping pipe 6 to the return pipe 12 (as in the water purification apparatus D ₁₎ . ).

A distribution tank 43 is provided from the entrance of the first path to the entrance of the second path. Each of the distribution tanks 43 is provided with a first introduction port 43a for introducing the pumped water in the water tank 1 into the filtration tank 10 and a second introduction port 43b for introducing the water into the water storage tank 2. .

Thus, the filtration in the filtration tank 10 and the electrolysis in the water storage tank 2 can be performed in parallel. At this time, the second inlet 43b is connected to the first inlet 43
a, the introduction speed of water into the water storage tank 2 is made slower than that into the filtration tank 10, so that sufficient time for electrolysis can be secured, and the phosphorus removal performance Can be improved.

As shown in FIGS. 5 and 8, a return path 44 is provided between the first path and the second path. Then, the water that has passed through the decolorization tank 3 enters the return path 44 from the return path entrance 44a, and is returned to the filtration tank 10 via the return path exit 44b.

[0045] Since the structure and function of the other parts of the water purification device D ₂ are the same as those of the water purification device D _1, detailed description thereof will be omitted.

[0046] The flow sheet of water purification process in the configured water purifier D ₂ as described above is shown in FIG.

Third Embodiment As shown in FIGS. 10 to 12, a water purification device D _{3 according to a} third embodiment of the present invention includes a water tank 1 and a filtration unit disposed above the water tank 1 as a filtration unit. A tank 10, a water storage tank 2 provided in parallel with the filtration tank 10, a decolorization tank 3 provided downstream of the water storage tank 2, a set of electrodes 4.4, and an electrode 4.4. It comprises a DC power supply (not shown) for supplying a current, an electrode holder 5, a pumping tube 6, a pumping pump 7, and a return tube 12.

A distribution tank 45 is provided downstream of the filtration tank 10 (the outlet of the first path). In each of the distribution tanks 45, the water passing through the filter 11 of the filtration tank 10 is returned to the return pipe 1
2 and a second advection port 45b for leading to the entrance of the first path. Then, the water that has exited the second advection port 45b from the distribution tank 45 is
The water is introduced from the return path outlet 44b to the water storage tank 2 (the entrance of the first path) through the return path 44 provided between the path and the second path.

The decolorization tank 3 is provided with an advection port 3a for guiding water that has passed through the filter 9 of the decolorization tank 3 to the return pipe 12.

[0050] Since the structure and function of the other parts of the water purifier D ₃ are the same as those of the water purification device D _2, the detailed description thereof is omitted.

[0051] The flow sheet of water purification process in water purifier D ₃ configured as described above is shown in FIG. 13.

[0052] In the water purifier D _3, receives the physical filtration and biological filtration in the filter 11 of the filtration tank 10, flotage is trapped and removed in water including the organic material such as seafood manure and Zan'esa Part of the water that has been drained is the first advection port 45a.
Through the return pipe 12, and another part is connected to the second advection port 45 b
To the entrance of the first path and undergoes the electrolysis in the water storage tank 2. Therefore, it is possible to prevent a possibility that the electrolysis in the water storage tank 2 is adversely affected by the suspended matter in the water (for example, the electrode is rendered nonconductive or the phosphorus compound generation reaction is prevented). Further, by arranging the filtration tank 10 and the water storage tank 2 side by side, the size of the apparatus can be reduced. In the present embodiment, iron ions are eluted by electrolyzing the electrodes 4 of the iron plate disposed in the water storage tank 2, but the ion generator is disposed outside the water storage tank 2. And water storage tank 2
May be configured to supply the ions.

[0053]

According to the first aspect of the present invention, a water tank for breeding organisms, a filter tank having a filter for containing water in the water tank and filtering organic matter in the water, and a juxtaposition to the filter tank are provided. A water storage tank for storing water in the water tank, ion supply means for supplying ions for precipitating and removing phosphoric acid in the water to the water in the water storage tank, a filter tank for storing the water in the water tank, and water storage. A transfer means for transferring the water purified by the filtration tank and the water purified by the water storage tank to the water tank are provided. Therefore, it becomes possible to stably and surely remove the phosphoric acid contained in the water in the water tank by coagulating it as a water-insoluble phosphorus compound in the water storage tank by the ion supply means. In addition, since the water storage tank is provided in parallel with the filtration tank, the filtration in the filtration tank and the ion supply to the water storage tank can be independently processed, and efficient water purification is performed. It becomes possible.

According to the second aspect of the present invention, a water tank for breeding organisms, a filter tank having a filter for containing water in the water tank and filtering organic matter in the water, and a filter tank are provided in parallel with the filter tank. A water storage tank for storing water in the water tank, and at least one set of electrodes disposed in the water storage tank and eluting iron ions or aluminum ions for precipitating and removing phosphoric acid in the water by electrolysis, A power supply for powering the electrodes;
Transfer means for transferring the water in the water tank to the filtration tank and the water storage tank,
Return means for returning the water purified by the filtration tank and the water purified by the water storage tank to the water tank. Therefore, by the electrolysis in the water storage tank, the phosphoric acid contained in the water in the water storage tank can be aggregated as a water-insoluble phosphorus compound in the water storage tank and can be stably and reliably removed. In addition, since the water storage tank is provided in parallel with the filtration tank, the filtration in the filtration tank and the electrolysis in the water storage tank can be independently processed, thereby performing efficient water purification. It becomes possible.

According to the third aspect of the present invention, the transfer means has control means for controlling the water in the water tank to be transferred only to the filtration tank or to the filtration tank and the water storage tank. Accordingly, the water in the water tank is appropriately transferred only to the filtration tank or to the filtration tank and the water storage tank, so that more efficient water purification can be performed.

According to the fourth aspect of the present invention, a distribution tank having a first inlet communicating with the filtration tank and a second inlet communicating with the water storage tank is provided, and the water in the water tank is transferred by the transfer means. It is transferred into the distribution tank. Therefore, the filtration in the filtration tank and the ion supply to the water storage tank or the electrolysis in the water storage tank can be performed in parallel. At this time, the second inlet is formed smaller than the first inlet,
By making the rate of introduction of water into the water storage tank slower than that of the filtration tank, sufficient time for the ion supply or the electrolysis can be secured, and the phosphorus removal performance can be improved. it can.

According to the fifth aspect of the present invention, there is provided a supply means for supplying the water purified in the filtration tank to the return means and the water storage tank. Therefore, part of the water purified in the filtration tank is returned to the water tank by the return means, and the other part is introduced into the water storage tank and is subjected to the ion supply or the electrolysis. It is possible to purify the water well.

In the invention according to claim 6, claim 1 is
In the water purifying apparatus according to any one of the above-described embodiments, further, a precipitation tank for precipitating the water-insoluble phosphorus compound generated by the reaction with the phosphoric acid between the water storage tank and the returning means. Is provided. Therefore, the phosphorus compound not precipitated in the water storage tank can be almost completely precipitated in the precipitation tank.

In the invention according to claim 7, claim 1 is
In the water purifying apparatus according to any one of the above-described aspects, further, between the water storage tank and the returning means, a colored water-insoluble phosphorus compound generated by a reaction with phosphoric acid is removed. A bleaching section is provided. Therefore, the colored phosphorus compound can be easily removed together with the phosphoric acid.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram of an upper part of a water purification device according to Embodiment 1 of the present invention as viewed from above.

FIG. 2 is a front cross-sectional view of the water purification device of FIG. 1 along a first path.

FIG. 3 is a front cross-sectional view of the water purification device of FIG. 1 along a second path.

FIG. 4 is a flow sheet of a water purification process in the water purification device of FIG. 1;

FIG. 5 is a configuration explanatory diagram of an upper part of a water purification device according to Embodiment 2 of the present invention as viewed from above.

FIG. 6 is a front cross-sectional view of the water purification device of FIG. 5 along a first path.

FIG. 7 is a front sectional view of the water purification device of FIG. 5 along a second path.

FIG. 8 is a sectional view taken along the line AA of FIG. 5;

FIG. 9 is a flow sheet of a water purification process in the water purification device of FIG.

FIG. 10 is a configuration explanatory diagram of an upper part of a water purification device according to Embodiment 3 of the present invention as viewed from above.

FIG. 11 is a front cross-sectional view of the water purification device of FIG. 10 along a first path.

FIG. 12 is a front sectional view of the water purification device of FIG. 10 along a second path.

13 is a flow sheet of a water purification process in the water purification device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water tank 2 Water storage tank 3 Decoloring tank 4 Electrode 5 Electrode holder 6 Pumping tube 7 Pumping pump 8 Inner lid 9 Filter 10 Filtration tank 11 Filter 12 Return pipe 13 Outer lid 16 Strainer 17 Aeration pipe 18 Blower 19 Air supply pipe 20 Control unit 40 Settling tank 41 Discharge valve 42 Drain pump 43 Distribution tank 43a First inlet 43b Second inlet 44 Return path 45 Distribution tank 45a First transfer port 45b Second transfer port

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B104 EA01 ED05 ED36 EE12 EF09 4D038 AA05 AB03 AB46 AB47 BA02 BA04 BA06 BB10 BB17 BB18 BB19 BB20 4D061 DA06 DB11 DB18 DB19 DC03 DC06 DC13 EA07 EB02 EB05 EB17 EB17 EB17 EB17 EB17 ED06 FA13 FA15 FA20 GC01 4D062 BA10 BA19 BA23 BB06 CA20 DA02 DA12 DC02 EA24 EA32 FA02 FA15 FA26

Claims (7)

[Claims] 1. A water tank for breeding an organism, a filter tank having a filter for storing water in the water tank and filtering organic matter in the water, and a water storage tank which is juxtaposed with the filter tank and stores water in the water tank. And ion supply means for supplying ions for precipitating and removing phosphoric acid in the water to the water in the water storage tank; transfer means for transferring water in the water tank to the filtration tank and the water storage tank; and A water purifying device, comprising: returning means for returning purified water and water purified in the water storage tank to the water tank. 2. A water tank for breeding organisms, a filtration tank having a filter for containing water in the water tank and filtering organic matter in the water, and a water storage tank arranged in parallel with the filtration tank and for storing water in the water tank. And at least one set of electrodes disposed in the water storage tank and eluted by electrolysis of iron ions or aluminum ions for precipitating and removing phosphoric acid in water; a power supply for supplying power to the electrodes; A water purification apparatus comprising: a transfer unit that transfers water to a filtration tank and a water storage tank; and a return unit that returns water purified by the filtration tank and water purified by the water storage tank to the water tank. . 3. The water purification apparatus according to claim 1, wherein the transfer means has control means for controlling transfer of water in the water tank to only the filtration tank or to the filtration tank and the water storage tank. 4. A distribution tank having a first introduction port communicating with the filtration tank and a second introduction port communicating with the water storage tank, wherein water in the water tank is transferred into the distribution tank by the transfer means. 1
Or the water purification device according to 2. 5. The water purification apparatus according to claim 1, further comprising a supply unit that supplies the water purified by the filtration tank to the return unit and the water storage tank. 6. Further, between the water storage tank and the return means,
The water purification device according to any one of claims 1 to 5, further comprising a precipitation tank for precipitating a water-insoluble phosphorus compound generated by a reaction with phosphoric acid. 7. Further, between the water storage tank and the return means,
The water purifier according to any one of claims 1 to 5, further comprising a decolorizing part for removing a colored water-insoluble phosphorus compound generated by the reaction with phosphoric acid.