JP2000263052A - Water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purifier capable of preventing the generation or growth of algae in a water tank. SOLUTION: A water purifier D1 comprises a water tank 1, a water receiving tank 2, a filtration tank 3, a decolorization tank 10, a pair of electrodes 4, 4, a direct-current power supply, a suction pipe 6, a circulation pump 7, and a return pipe 12. The iron ions eluted to a water receiving tank 2 by electrolysis react with phosphoric acid in water to produce water-insoluble phosphorus compounds, which are flocculated. A part of the flocculated water-insoluble phosphorus compounds floats on water, and the other part precipitates and accumulates in the water receiving tank 2. A control part 20 carries out control of drive of a circulation pump 7 and of a blower 18 and control of electrolysis in the water receiving tank 2. The control part 20 memorizes a prescribed current value, and directs to perform constant current electrolysis for keeping the concentration of phosphate ion in sea water in the water tank 1 between 0.003 and 0.03 mg/l.

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 for breeding organisms such as seafood, turtles and aquatic insects.

[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 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 purification apparatus, the content of phosphoric acid and nitrogen in water in the water tank increases due to the organic substances. Then, algae are generated in the water tank and adhere to the wall surface of the water tank. 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 or exchange water, which is troublesome.

Further, when artificial seawater is put into a water tank, the concentration of phosphoric acid in the seawater is considerable (several times higher than freshwater).
Algae are generated in the water tank in a short period of time. In addition, feeding more than an appropriate amount of food to the organisms in the aquarium, or increasing the number of organisms at one time and feeding more food, causes a large amount of food to float in the aquarium, thereby increasing the amount of phosphorus in the water. Algae develops in the water tank in a short time even when the acid content and the nitrogen content increase rapidly.

[0006] Regarding the removal of nitrogen, harmful ammonia is decomposed into nitric acid having low toxicity by filtering bacteria such as nitrifying bacteria and nitrifying bacteria. However, there is no definitive means for removing the phosphoric acid content.

The present invention has been made in view of such circumstances, and an object of the present invention is to remove most of the phosphoric acid content in an aquarium so that algae may be generated or multiply in the aquarium. An object of the present invention is to provide a water purification device that can prevent the risk.

[0008]

According to one aspect of the present invention, a water tank for storing seawater for breeding creatures, a water storage tank for storing seawater transferred from the water tank, and the water storage tank. An ion supply unit for supplying iron ions or aluminum ions for precipitating and removing phosphoric acid in seawater in the tank, and a control unit for controlling at least the ion supply unit, wherein the control unit includes: Adjust the phosphate ion concentration to 0.
There is provided a water purification apparatus characterized in that the ion supply unit is controlled so as to be maintained at 003 to 0.03 mg / liter.

[0009] The aquarium is filled with seawater for breeding organisms (such as seafood, turtles and aquatic insects)-any of natural seawater, artificial seawater and mixed seawater obtained by mixing these at a fixed ratio. The water storage tank is disposed above or beside the water tank, and the seawater in the water tank is transferred and stored therein.

The ion supply unit includes an iron dissolving device in which iron pieces are immersed in seawater to elute iron ions, and a chemical solution supply for supplying a predetermined amount of a chemical solution that generates aluminum ions. In addition to the apparatus, an apparatus including at least one set of electrodes that elute iron ions or aluminum ions by electrolysis and a power supply that supplies power to the electrodes is preferably used.

The control section controls at least the ion supply section, and controls the ion supply section so as to maintain the phosphate ion concentration of seawater in the water tank at 0.003 to 0.03 mg / liter.

The reason why the phosphate ion concentration of the seawater in the water tank is maintained at 0.003 to 0.03 mg / liter is that the phosphate ion concentration of the seawater in the water tank is variously changed and the phosphate ion concentration in the water storage tank is changed. This is based on the results of an experiment conducted by the inventor to investigate how algae are generated in an aquarium when an amount of iron ion or aluminum ion is supplied.

That is, according to the experiment, when the concentration exceeds 0.03 mg / liter, the phosphoric acid content in the water tank cannot be sufficiently removed by ion supply, and algae such as diatoms and green algae remain in the water tank. It cannot be prevented that they occur and grow and proliferate, but 0.03 mg /
It was found that the diatoms generated were less than 1 liter, and that the growth of green algae was stopped.
If it is less than 3 mg / liter, diatoms and green algae are unlikely to be generated, but it has been found that breeding organisms in the aquarium are presumed to have adverse effects such as poor growth and disease infection.

[0014] Since the water purification device is provided with such a control unit, there is a possibility that algae may be generated or multiplied in the water tank by appropriate ion supply while maintaining the phosphate ion concentration of seawater in the water tank within a certain range. Can be prevented.

According to another aspect of the present invention, a water tank for storing seawater for breeding creatures, a water storage tank for storing seawater transferred from the water tank, and a water tank disposed in the water storage tank. Equipped with at least one set of electrodes for eluting iron or aluminum ions by electrolysis to precipitate and remove phosphoric acid in seawater, a power supply for supplying power to the electrodes, and a control unit for controlling at least the electrolysis , The control unit
The phosphate ion concentration of seawater in the aquarium is 0.003 to 0.0
A water purification device is provided, wherein electrolysis is controlled so as to maintain 3 mg / liter.

The electrodes are, for example, rectangular plates and are arranged in pairs in the water storage tank in a predetermined set, and iron or aluminum ions are eluted 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. Preferably, 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 eluted into the water storage tank by electrolysis
Or aluminum ions are converted to phosphoric acid (or
To phosphoric acid to form a water-insoluble phosphorus compound (Fe (O
H) _x(PO_Four)_yOr Al (OH)_x(P
O_Four)_y) And agglomerated, and partly settled in the water storage tank
accumulate. The deposited phosphorus compounds are periodically discarded.
Therefore, the phosphoric acid in the seawater in the water tank is
It can be removed.

The control section controls at least the electrolysis, and controls the phosphate ion concentration of the seawater in the water tank to 0.0%.
The electrolysis is controlled so as to be maintained at 03 to 0.03 mg / liter.

Here, the reason why the phosphate ion concentration of the seawater in the water tank is maintained at 0.003 to 0.03 mg / liter is that the phosphate ion concentration of the seawater in the water tank is changed variously to change the phosphate ion concentration in the water storage tank. This is based on the result of an experiment conducted by the inventor, which examined how algae are generated in an aquarium when electrolysis is performed.

That is, according to the experiment, if the concentration exceeds 0.03 mg / liter, the phosphoric acid content in the water tank cannot be sufficiently removed by electrolysis, and algae such as diatoms and green algae remain in the water tank. It cannot be prevented that they occur and grow and proliferate, but if the amount is less than 0.03 mg / liter, it is found that the diatoms that have died are killed and the growth of green algae is stopped. Is 0.003
If the amount is less than mg / liter, diatoms and green algae are unlikely to be generated, but it has been found that breeding organisms in the aquarium are presumed to have adverse effects such as poor growth and disease infection.

Since the water purification apparatus is provided with such a control unit, there is a possibility that algae may be generated or multiplied in the water tank by appropriate electrolysis while maintaining the phosphate ion concentration of seawater in the water tank within a certain range. Can be prevented.

The water purifying apparatus according to the present invention further includes a phosphate ion sensor for detecting a phosphate ion concentration of seawater, and the control unit performs the control (ion supply) based on a detection result by the phosphate ion sensor. It is even more preferred to carry out the control of the section or the control of the electrolysis.

The phosphate ion sensor is disposed in the water tank and detects a phosphate ion concentration of seawater in the water tank. As this sensor, for example, a known sensor provided with an ion-sensitive film holding an ion-sensitive substance made of a copper complex having one kind of chain diamine as a ligand is preferably used.

The control unit increases or decreases the amount of ion supply or maintains the same level of ion supply based on the detection result of the phosphate ion sensor-the value of the phosphate ion concentration of water in the water tank. Instruct the ion supply unit or the power supply for electrolysis to increase or decrease the degree of electrolysis or to maintain the same level of electrolysis.

When the water purification device is provided with such a control unit and a phosphate ion sensor, it is possible to automatically perform appropriate ion supply or electrolysis according to the detection result by the sensor, Therefore, it is possible to prevent the possibility that algae are generated or proliferate in the water tank.

[0027] The water purification apparatus according to the present invention further comprises a feeder for feeding food to the organisms in the aquarium, and the control unit detects the amount of the bait supplied into the aquarium by the feeder and detects the amount of the feed. More preferably, the control is performed based on the detection result.

As the feeding device, for example, a device provided with a container for storing food, a motor for feeding the food from the container into the water tank, and a controller for controlling the driving of the motor is preferably used. Can be

The control unit detects the amount of food supplied into the water tank by the feeding device. Then, the ion supply unit or the electrolysis is controlled based on the detection result. As an example of control by this control unit, the phosphate ion concentration in the water tank is estimated from the total amount of food supplied to the water tank within a certain period of time by the feeding device, and when the estimated concentration exceeds a predetermined value, ion There are some which give an instruction to operate the supply unit.

In the case where the water purifying apparatus is configured as described above, the control section controls the ion supply section or the electrolysis so that appropriate ion supply or electrolysis can be automatically performed. Therefore, it is possible to prevent the algae from being generated or growing in the water tank.

In the water purifying apparatus according to the present invention, instead of the phosphate ion sensor and the control section as described above, the control section maintains the current value for supplying ions or electrolysis within a certain range. It is more preferable to perform the above-mentioned control.

That is, in order to maintain the phosphate ion concentration of the seawater in the water tank within the appropriate range, one or more current values for supplying ions or for electrolysis are stored in the control unit in advance. In advance, the control unit instructs the ion supply unit or the power supply for electrolysis to perform appropriate ion supply or electrolysis based on the one current value or the current value selected by the user.

When the water purification device is provided with such a control unit, appropriate ion supply or electrolysis can be performed, and therefore, the risk of algae being generated or growing in the water tank is prevented. be able to.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Note that the present invention is not limited by this.

As shown in FIGS. 1 to 3, a water purifying apparatus D according to one embodiment of the present invention comprises a water tank 1, a water storage tank 2, a filtration tank 3, a decolorizing tank 10, and Set of electrodes 4.4
A DC power supply (not shown) for supplying a current to the electrodes 4, 4; an electrode holder 5; a pumping tube 6;
And a return pipe 12. The water tank 1 to the pumping pipe 6 to the water storage tank 2 to the filtration tank 3 to the decolorizing tank 10 to the return pipe 12 form one circulation channel.

The aquarium 1 contains artificial seawater for breeding seafood and the like, and is formed of a box having a substantially rectangular planar shape. The seawater in the water tank 1 is supplied to a pumping pipe 6 and a circulation pump 7.
The water is pumped up to the water storage tank 2. The water storage tank 2 is placed on an inner lid 8 that covers the opening edge of the water tank 1.

The water storage tank 2 is for storing seawater pumped from the water tank 1 and removing phosphoric acid therein. Each of the pair of electrodes 4 in the water storage tank 2 is a rectangular plate-like iron plate, and elutes iron ions for removing phosphoric acid in seawater by electrolysis. Electrode holder 5
Is electrically insulative and is attached to the upper ends of the electrodes 4 to keep the distance between them constant.

The iron ions eluted into the water storage tank 2 by electrolysis react with phosphoric acid (orthophosphoric acid) in seawater,
Colored water-insoluble phosphorus compound (Fe (OH) _x (PO ₄ )
_y ) and agglomerate, and a part thereof floats in seawater and another part precipitates and accumulates in the water storage tank 2.

The filtration tank 3 is provided on the downstream side of the water storage tank 2 for introducing and removing a water-insoluble phosphorus compound floating in seawater and organic matter such as manure and residual food of fish and shellfish through the advection port 2a. And a filter 9 for removing a phosphorus compound and performing biological filtration.

The filter 9 is made of a needle-punched sheet-shaped nonwoven fabric made of polypropylene as a raw material (as an example, a basis weight: 400 g / m ² , a thickness of 4.0 mm, and a gas permeability of 1).
60 cc / cm ² / sec).

The decolorization tank 10 is provided on the downstream side of the filtration tank 3, and transfers seawater that has passed through the filter 9 of the filtration tank 3 to the advection port 3 a.
Through which the colored phosphorus compound is decolorized and filtered, and has a built-in filter 11 for performing filtration.

The filter 11 is made of polypropylene resin and has a length of about 10 mm, an outer diameter of about 6 mm, and an inner diameter of 3 mm
A large number of hollow cylinders are accommodated in a bag.

The return pipe 12 is provided on the downstream side of the decolorizing tank 10 so as to penetrate the inner lid 8, and is used for returning the seawater that has been purified by passing through the decolorizing tank 10 and overflows from the advection port 10 a to the water tank 1. Things.

Reference numeral 13 denotes an outer lid which is placed on the edge of the end wall of the inner lid 8. Reference numeral 14 denotes an electrode fixing plate having an opening 14a. The electrode fixing plate 14 inserts a pair of electrodes 4.4 attached to the electrode holder 5 into the opening 14a and
15 for fixing.

Reference numeral 16 denotes a strainer arranged inside the water tank 1 and connected to the pumping pipe 6. 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 is connected to the water storage tank 2 through an air supply pipe 19 from an air supply blower 18 arranged outside the water storage tank 2.
Compressed air is supplied to the bottom of the electrode 4 and the generated bubbles cause
・ Wash the surface of 4.

Reference numeral 20 denotes a control unit, which is a circulating pump 7
The following electrolysis control of the water storage tank 2 is performed together with the drive control of the blower 18.

FIG. 4 shows a flow sheet of the water purification process in the water purification apparatus D configured as described above.

In order to maintain the phosphate ion concentration of seawater in the water tank 1 at 0.003 to 0.03 mg / liter, the control unit 20 controls the current value for electrolysis in advance to 1
Are stored. This current value indicates how algae are generated in the water tank 1 when electrolysis is performed at various current values in the water storage tank 2 by variously changing the phosphate ion concentration of seawater in the water tank 1. This is based on the results of the experiments conducted by the inventors.

Then, based on the one current value, the control unit 20 instructs the power supply for electrolysis and the like to perform appropriate electrolysis.

FIG. 5 shows the relationship between the phosphate ion concentration (vertical axis) and the elapsed time (horizontal axis) of the artificial seawater in the water tank 1 by the electrolysis in the water storage tank 2 controlled by the control unit 20. It is a graph shown.

Explaining based on this graph,
Electrolysis was started in the water storage tank 2 at noon on January 11, 1 (Monday). Immediately before the start, the phosphate ion concentration of the artificial seawater was measured by a phosphate ion measuring device (not shown), and was found to be 0.29 mg / liter. Then, constant current electrolysis was advanced based on the current value stored in the control unit 20, and the same concentration was measured at noon every day except holidays, Saturdays and Sundays in the four weeks until February 8. .

The phosphate ion concentration on January 12 was 0.06 mg / liter, which was 24% from the previous day.
It turned out that it dropped sharply in time. The concentration is 0.04 mg / liter on January 14 and 0.0
Gradually decreased to 4 mg / liter,
mg / liter.

On January 14, it was recognized that diatoms formed on the surface of the gravel layer 21 at the bottom of the water tank 1. The diatom grew as time passed on days 18, 19 and 20. On the 20th, it was confirmed that green algae newly appeared on the surface of the gravel layer 21.

On January 21, the phosphate ion concentration in seawater became 0.02 mg / liter. Thereafter, for 18 days until February 8, the concentration was approximately 0.02 mg / liter. During this period, the diatoms gradually died, and no growth of green algae was observed.

According to the water purification device D, the control unit 20 can control an appropriate electrolysis in accordance with the phosphate ion concentration in the artificial seawater in the water tank 1, and therefore, algae may be generated in the water tank 1. Alternatively, the possibility of proliferation can be prevented.

[0056]

According to the first aspect of the present invention, a water tank for storing seawater for breeding creatures, a water storage tank for storing seawater transferred from the water tank, and An ion supply unit for supplying iron ions or aluminum ions for precipitating and removing phosphoric acid in seawater, and a control unit for controlling at least the ion supply unit are provided, and the control unit includes a phosphate ion for seawater in the water tank. Concentration 0.003 ~
The ion supply unit is controlled so as to maintain the concentration at 0.03 mg / liter. Therefore, by the appropriate ion supply while maintaining the phosphate ion concentration of the seawater in the water tank within a certain range, it is possible to prevent the algae from being generated or growing in the water tank.

According to the second aspect of the present invention, a water tank for storing seawater for breeding creatures, a water storage tank for storing seawater transferred from the water tank, and the water storage tank are provided in the water storage tank. And at least one set of electrodes that elutes iron ions or aluminum ions by electrolysis to precipitate and remove phosphoric acid in seawater, a power supply for supplying power to the electrodes, and a control unit that controls at least the electrolysis. And the control unit sets the phosphate ion concentration of the seawater in the water tank to 0.003 to
It is configured to control the electrolysis so as to maintain 0.03 mg / liter. Therefore, by the appropriate electrolysis while maintaining the phosphate ion concentration of the seawater in the water tank within a certain range, it is possible to prevent the algae from forming or growing in the water tank.

According to the third aspect of the present invention, there is further provided a phosphate ion sensor for detecting a phosphate ion concentration in seawater, and the control unit performs the control based on a detection result by the phosphate ion sensor. It is possible to automatically perform appropriate ion supply or electrolysis according to the detection result by the sensor because it is configured to perform, and therefore, it is possible to prevent algae from forming or growing in the aquarium. be able to.

According to the fourth aspect of the present invention, there is further provided a feeding device for feeding food to the organisms in the water tank, and the control unit detects the amount of food fed into the water tank by the feeding device. And the control is performed based on the detection result. Therefore, appropriate ion supply or electrolysis can be automatically performed, and the possibility that algae are generated or multiplied in the water tank can be prevented.

According to the fifth aspect of the present invention, the control unit is configured to perform the control by keeping the current value for supplying ions or electrolysis within a certain range. Appropriate ion supply or electrolysis can be performed, and therefore, the risk of algae occurring or growing in the aquarium can be prevented.

In the invention according to claim 6, the seawater is:
Since it is one of natural seawater, artificial seawater, and mixed seawater in which these are mixed at a certain ratio, whether the seawater contained in the aquarium is natural or artificial, and how Irrespective of whether they are mixed at an appropriate ratio, appropriate ion supply or electrolysis can be performed, and therefore, the risk of algae being generated or growing in the water tank can be prevented.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a water purification device according to one embodiment of the present invention.

FIG. 2 is a configuration explanatory view of an upper part of the water purification device of FIG. 1 as viewed from above.

FIG. 3 is an exploded perspective view of a part of the water purification device of FIG.

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

5 is a graph showing the relationship between the phosphate ion concentration of artificial seawater in a water tank and the passage of time by electrolysis in the water purification device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water tank 2 Water storage tank 3 Filtration tank 4 Electrode 6 Pumping pipe 7 Circulation pump 8 Inner lid 9 Filter 10 Decolorization tank 11 Filter 12 Return pipe 13 Outer lid 14 Electrode fixing plate 16 Strainer 17 Aeration pipe 18 Air supply blower 19 Air supply pipe 20 control unit

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2B104 CA01 CF01 CF28 EF09 4D038 AA05 AB03 AB46 AB47 BA04 BA06 BB10 BB17 BB18 BB19 BB20 4D061 DA06 DA09 DB02 DB09 DB19 DC13 EA06 EB05 EB19 EB27 EB28 EB30 EB30

Claims (6)

[Claims] 1. A water tank for storing seawater for breeding organisms, a water storage tank for storing seawater transferred from the water tank, and a sediment for removing phosphoric acid in seawater in the water storage tank. An ion supply unit for supplying iron ions or aluminum ions, and a control unit for controlling at least the ion supply unit, wherein the control unit sets the phosphate ion concentration of seawater in the water tank to 0.00.
A water purifier characterized by controlling an ion supply unit so as to maintain the ion supply unit at 3 to 0.03 mg / liter. 2. A water tank for storing seawater for breeding organisms, a water storage tank for storing seawater transferred from the water tank, and a water tank disposed in the water storage tank to precipitate phosphoric acid in seawater. At least one set of electrodes for eluting iron ions or aluminum ions for removal by electrolysis, a power supply for supplying power to the electrodes, and a control unit for controlling at least the electrolysis are provided. The phosphate ion concentration of seawater is 0.00
A water purification apparatus, wherein electrolysis is controlled so as to maintain the concentration at 3 to 0.03 mg / liter. 3. The water according to claim 1, further comprising a phosphate ion sensor for detecting a phosphate ion concentration of seawater, wherein the control unit performs the control based on a detection result by the phosphate ion sensor. Purification device. 4. A feeding device for feeding food to the organisms in the aquarium, wherein the control unit detects the amount of food supplied to the aquarium by the feeding device and performs the control based on the detection result. The water purification device according to claim 1 or 2, wherein the water purification is performed. 5. The water purification apparatus according to claim 1, wherein the control unit performs the control by maintaining a current value for supplying ions or electrolysis within a certain range. 6. The water purification apparatus according to claim 1, wherein the seawater is one of natural seawater, artificial seawater, and mixed seawater in which these are mixed at a fixed ratio.