JPH0278495A - Method and apparatus for purifying water of water supply and distribution line - Google Patents

Abstract

PURPOSE:To remove a mineral component in water in the form of nonadhesive scale by acting oscillating electromagnetic field to a metal salts dissolved in the water to be treated and promoting ionization of the salt by the electric oscillation energy. CONSTITUTION:HCO2 ion forms CO2 and OH ion by hydration, and CO2 is removed as gaseous CO2 out of the system by the effect of reduced pressure in a tank 2. On one hand, metal ion (mineral ion) in the water form a product having affinity with OH<-> ion which is increased in accompany with the removal of CO2 by the deaeration effect under reduced pressure in the tank 2 while the metal ion passes through a space between electrode groups A1, and deposits in the form of a product bonded to OH group. As the result, the product bonded to OH group, which is a nonadhesive deposit, is liberated and precipitated on the bottom of the tank in accompany with the promotion of ionization of the mineral component in the water, causing decrease of the mineral ion concn. in the water to be treated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to the treatment of dissolved minerals in water, which cause scale build-up in water supply pipes and cold/hot water pipes in buildings or factories, for example, by treating them with chemicals. The present invention relates to a water purification method and device for water supply and distribution systems that physically removes water without using it.

[Conventional technology]

Conventional measures to prevent scale from occurring in the water systems of water supply and distribution pipes, cold and hot wood pipes, boilers, refrigerators, and coolers include water pretreatment methods that convert hard water into soft water using ion exchange resin, and the use of soft water. There are widely known in-can treatment methods that use chemicals to complex metal salts in the water to treat scale that can be generated even in water.

In addition, as a method other than Goret et al.'s method, water is introduced into a tank with an electrostatic field, and by reducing the pressure inside this tank, dissolved gases in the water are removed, and while passing through the electrostatic field, water is removed. A treatment method is also known in which the ion dissociation of non-electrolytes in water is promoted to remove them as floating scales, and the water is also made alkaline (Japanese Unexamined Patent Publication No. 78003/1983).

[Problem to be solved by the invention]

As mentioned above, in the past, in order to reduce scale damage during maintenance of pipes and boilers, water was softened using ion exchange resins, deoxidizing agents were added to prevent acid corrosion, or solidification was performed. The administration of can cleaning agents is carried out as a treatment for the scale that is present, but in reality, (1) the use of chemicals is harmful to the human body, and (2)
) The amount of metal salts dissolved in water changes, making it difficult to manage the use of appropriate chemicals; (3) The amount of disposable chemicals increases; and so on. Therefore, maintenance and management based on the injection of chemicals is extremely difficult and has disadvantages such as being uneconomical.

On the other hand, the method of treating water in an electrostatic field requires covering the electrodes that make up the electrostatic field with a reliable insulating material to prevent the water from electrolyzing in the tank. This means that the electrostatic field processing system is a capacitor in terms of an electric circuit, and a charging current only flows when the switch is turned on, and once charging is completed, no current flows until the capacitor is discharged.

Therefore, only an electrostatic field exists, and there is a drawback that unless the electrostatic voltage is extremely high, the energy effect imparted to the water is small. It is also possible to use bare electrodes to carry out current treatment within a range where water electrolysis does not occur, but in this case, the voltage should be adjusted so that the current density is commensurate with the /M degree of mineral ions present in the water. This is not satisfactory as a practical A stone surface because it requires a sophisticated current control system and is also limited by the risk prevention of hydrogen generation when electrolysis occurs. The drawback was that it was not possible to enjoy the desired effects.

[Means to solve the problem]

The present invention aims to solve the problems in the conventional purification methods as described above, and its basic idea is to degas the dissolved gas in a reduced pressure atmosphere and remove unelectrolyzed metal salts from the water to be treated. Mineral components in the water to be treated are precipitated and removed as non-adhesive scale by a combination of treatment using an oscillating electromagnetic field and promotion of ion dissociation.

That is, in the water supply and distribution system water purification method according to the invention set forth in claim 1, the water to be treated is passed through a treatment tank whose interior is in a reduced pressure state to deaerate the water, and at least Water to be treated is brought into contact with a pair of electrodes, one of which is coated with a dielectric material, and dissolved gas in the water to be treated is removed under reduced pressure conditions in the tank. By applying an alternating voltage with an adjusted frequency, an oscillating electromagnetic field is applied to the dissolved metal salt in the water to be treated between the electrode pair, and ion dissociation of the metal salt in the water to be treated is caused by electric vibrational energy. By promoting this process, metal salts are separated and removed as non-adhesive precipitates.

According to a second aspect of the invention, in the water purification method of the first aspect, the frequency of the alternating voltage is tuned to the resonance frequency of an electric circuit between the pair of electrodes containing the water to be treated.

According to a third aspect of the present invention, in the water purification method of the first aspect, the water to be treated is caused to flow in a direction intersecting a magnetic field or electric lines of force generated in the electrode pair.

The water purification device for a water supply and distribution system according to the invention according to claim 4 includes a treatment tank having means for introducing water to be treated and means for taking out treated water, and maintaining the inside of the treatment tank in a reduced pressure state. A depressurizing deaeration means for degassing, an electrode pair with at least one side coated with a dielectric material and arranged so as to be in contact with the water to be treated in the treatment tank, and a It is equipped with a power supply device that applies an alternating voltage of a regulated frequency, and a means for separating and removing non-adhesive precipitates deposited in the water to be treated in the treatment tank, and is introduced into the tank in a reduced pressure state. While the water to be treated is continuously passed between the pair of electrodes, the alternating voltage applies oscillating electromagnetic field energy to the dissolved metal salts in the water to be treated.

In the invention according to claim 5, in the water purification apparatus according to claim 4, the introducing means is provided with a water sprinkling means for sprinkling the water to be treated in the upper space of the treatment tank, and the depressurizing degassing means is provided with the The tank is degassed from the upper space.

In the invention as set forth in claim 6, in the water purification apparatus as set forth in claim 4, a variable voltage is provided to output an alternating voltage tuned to a resonant frequency of an electric circuit between the pair of electrodes containing the water to be treated to the power supply device. It is equipped with a frequency power supply circuit.

In the invention as set forth in claim 7, in the water purification apparatus as set forth in claim 4, the electrode pair is a square consisting of a plurality of elongated parallel electrodes arranged along a direction intersecting the flow of the water to be treated in the treatment tank. It is composed of a bundle of electrodes in a lattice arrangement, and water to be treated flows through gaps within the electrode bundle.

Furthermore, in the invention according to claim 8, in the water purification apparatus according to claim 7, each electrode is arranged such that the direction of the current flowing through each electrode of the electrode bundle is opposite to that of adjacent electrodes in the lattice arrangement. It is connected.

[Effect]

Generally, water in water supply and distribution systems contains mineral components (metals) such as calcium and magnesium.
O: +) z and Mg (IICO, J) 2 and other hydrogen carbonates). When metal salts such as calcium and magnesium in this group are precipitated as lucium carbonate (CaC0t) or magnesium carbonate (MgC) (h) due to a decrease in dissolved carbon dioxide in water or water nuclear power generation,
It forms a scale that firmly adheres to the inner surface of the pipe.

In the water purification method according to the invention according to claim 1,
By introducing the water to be treated into a treatment tank under reduced pressure, dissolved gases such as CO2 and 02 dissolved in the water are degassed under reduced pressure until the concentration is balanced with the pressure inside the tank and discharged outside the tank. do. At the same time, in order to prevent the mineral components dissolved as hydrogen carbonate in the water to be treated in the tank from precipitating as carbonates, ions are generated by forcibly exciting the extranuclear electrons of the mineral components by external electrical vibrational energy. The mineral ions are dissociated and combined with hydroxyl ions in the water to be treated to form a non-adhesive hydroxyl group-bound product.

In this case, the electrical vibrational energy causes the water to be treated to pass between a pair of electrodes, at least one of which is covered with a dielectric material, to form a capacitor containing the water to be treated, and to form a condenser containing the water to be treated. This is given by applying an alternating voltage to . That is, the applied alternating voltage generates an electromagnetic field between the electrode pair that oscillates at the frequency of the alternating voltage.
Under the action of this oscillating electromagnetic field, extranuclear electrons of mineral components in the water to be treated are excited, and ion dissociation is promoted.

For example, in the case of calcium, Ca (HCO+) z dissolved in the water to be treated as bicarbonate is dissociated into calcium ions Ca'' and bicarbonate ions lIC0,- by the vibration energy generated by the oscillating electromagnetic field, and further When hydrogen carbonate ions hydrate with water in the water to be treated, CO
2 and hydroxyl ion 01)-. The same applies to other metal hydrogen carbonates.

In this case, the oscillation frequency of the oscillating electromagnetic field is determined in advance based on data such as water quality measurement results so that optimal vibration energy is transferred depending on the type of mineral component in the water to be treated.

Mineral ions ionized in this way combine with negative ions in the water to be treated to form precipitates, but since the pressure inside the tank is reduced as described above, the carbon in the water to be treated is
CJz? The a degree is extremely low. Therefore, many of the mineral ions lose the opportunity to bond with carbonate ions in the water to be treated, and instead cause an affinity reaction with the hydroxide ions 01(-) that are increasing in the water to be treated, and as a result,
It will precipitate as floating hydroxide, which is difficult to adhere to pipe walls.

This precipitated hydroxyl substance (hydroxyl group bond), for example, C
a, MP, etc. are precipitated and separated as non-adhesive water affinities in the water to be treated with a low concentration of carbon dioxide, and are removed from the system.

Therefore, water that has undergone such treatment has an extremely low ion concentration of mineral components that cause scale formation, and exhibits weak alkalinity due to the increase in hydroxyl ions, making it convenient for water supply and distribution piping. be.

The precipitation of mineral components can be kept optimal by appropriately adjusting the frequency of the alternating voltage applied between the electrode pair. Therefore, in the invention according to claim 2, the frequency and wave number of the alternating voltage are tuned to the resonant frequency of the electric circuit between the pair of electrodes containing the water to be treated. As a result, the maximum oscillating electromagnetic field energy corresponding to the type of mineral components in the water to be treated is delivered, and the ion dissociation is carried out with maximum efficiency.

Further, in the invention according to claim 3, when the water to be treated is caused to flow in a direction intersecting the magnetic field or the lines of electric force generated in the electrode pair, the oscillating electromagnetic field acts on the metal salts in the flowing water to be treated. will be done most effectively.

The water purification device for a water supply and distribution system according to the invention set forth in claim 4 is an apparatus for carrying out the invention set forth in claim 1, and the treatment tank receives treated water bypassed from the water supply and distribution system. The system has an introduction means for introducing the water and a means for taking out the treated water. For example, the upper space within this treatment tank is maintained at a reduced pressure by a reduced pressure degassing means including a vacuum pump, and dissolved gas in the water to be treated is degassed there. Inside the processing tank, a pair of electrodes is arranged so as to be submerged in the water to be treated stored below the upper space, and at least one of the electrode pairs is coated with a dielectric material. An alternating voltage with a frequency pre-adjusted according to the water quality of the water to be treated is applied between the electrode pair from the power supply, and below the electrode pair, non-adhesive precipitates deposited in the water to be treated in the treatment tank are applied. For example, a means such as a drain condenser is provided to separate and remove the water.

This device applies oscillating electromagnetic field energy to the water to be treated using the alternating voltage while degassing the water introduced into the tank under reduced pressure and passing it continuously between the pair of electrodes in the tank. This ionizes the mineral components in the water to be treated by the ion dissociation promoting effect, precipitates them as non-adhesive hydroxyl group-bonded substances in the water to be treated, separates them by precipitation, etc., and periodically removes them. .

In the invention according to claim 5, the introduction means is equipped with a water sprinkling means for sprinkling the water to be treated in the upper space of the processing tank, and the surface area of the water to be treated is increased and the reduced pressure degassing means This allows efficient deaeration from the upper space of the tank.

In the invention according to claim 6, the power supply device is equipped with a variable frequency power supply circuit that outputs an alternating voltage tuned to a resonant frequency of an electric circuit between the pair of electrodes containing the water to be treated. Based on the data obtained from water quality tests, etc., the species of dissolved mineral components in the water to be treated is determined so that maximum energy can be given and received according to the publication. In this case, electrically, the circuit is a series resonant circuit consisting of a resistive component, an inductive component, and a capacitive component. Therefore, the resonant frequency is the frequency at which the maximum current determined by the resistive component flows from the power supply to this circuit. Good too.

In the invention according to claim 7, the electrode pair is constituted by a square lattice array electrode bundle consisting of a plurality of elongated parallel electrodes arranged along a direction intersecting the flow of the water to be treated in the treatment tank, and The water is allowed to flow through the gaps within the electrode bundle, which creates a pile-like effect on the flow of the water to be treated, increasing the surface area of the electrodes and increasing the contact area with the water to be treated. This is what I did. In addition to flowing between the electrode bundles, the water to be treated passes between many pairs of electrodes and is repeatedly subjected to the action of the oscillating electromagnetic field.

Furthermore, in the invention according to claim 8, in the water purification apparatus according to claim 7, each electrode is arranged such that the direction of the current flowing through each electrode of the electrode bundle is opposite to that of adjacent electrodes in the lattice arrangement. It is connected. This means that among the plurality of electrodes constituting the electrode bundle, the ends of each electrode are connected in series so that one electrode of the electrode pair and the other electrode form individual current return paths. This can be achieved by In this way, when an electrode pair is charged in the forward and reverse directions by applying an alternating voltage, the alternating magnetic flux and electric lines of force generated around each electrode will effectively intersect with the water to be treated, and the This reduces the loss of # members due to the action of the oscillating electromagnetic field.

A preferred embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

FIG. 1 is an assembly system diagram of a water purification device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of an electrode group. As shown in Fig. 1, this device is bypass-connected to the water supply tank l of the water supply system through a water supply connection pipe 4 and its water supply pump 5, and a condensate connection pipe 6 and its condensate pump 7. A treatment tank 2 is provided, and in the upper space inside the treatment tank 2, the water to be treated is degassed under reduced pressure by a vacuum pump 3 and an exhaust pipe 3a connected to the upper end of the tank via a steam separator 13. It is now possible to do so.

In addition, in the water to be treated that has accumulated in the lower part of the upper space in the treatment tank 2, there are a plurality of electrodes 9 covered with a dielectric material and a plurality of pairs of electrodes 10, which are made up of a plurality of electrodes 9 covered with a dielectric material and the same number of bare electrodes 10 that are not covered. An electrode group A is arranged horizontally within the processing tank 2. As shown in FIG. 2, this electrode group A is constructed such that both ends of the elongated electrode 9 and the bare electrode 10 are held by an end plate B made of insulating resin.
They are arranged in horizontal bundles in a square grid array parallel to each other and spaced apart. Furthermore, in this electrode group A, the end plate B is securely fixed to the side plate 2a of the processing tank 2, and the electrodes 9 and the electrode 1 are connected to each other inside the end plates B at both ends.
0 are separately connected in series to adjacent electrodes using lead wires (not shown), so that the directions of current flow in the adjacent electrodes are opposite to each other.

An electric power device 12 for applying an alternating voltage between the electrode 9 and the bare electrode 10 is connected to each of the electrode groups A, and as shown in FIG. A forward/reverse converter 14 including a flip-flop inverter and a variable frequency oscillator for controlling the flip-flop inverter, a voltage amplifying section 15, a power amplifying section 16 so as to receive power from a commercial AC power source and function as a variable frequency alternating power source. , and a transformer 17 for impedance matching to the electrode group A.

If the inductance of the electric circuit between the electrode pair is C, and the capacitance is C, then the resonant frequency of this circuit is r=1
An alternating voltage with a frequency equal to /2πf is applied to the power supply 12.
By applying it from the source, it is possible to apply oscillating electromagnetic field energy to the water to be treated with maximum efficiency.

In addition, each electrode in electrode group A is constructed by arranging a plurality of series-connected electrodes in each pair adjacent to each other in a square lattice arrangement so that the direction of current is opposite between adjacent electrodes. The magnetic flux generated around the surrounding area according to the right-handed screw law and the electric lines of force generated radially in the radial direction of each electrode do not cancel out between adjacent electrodes but overlap additively, and the water to be treated interacts effectively with these magnetic flux and electric lines of force. The flow will intersect with the .

Incidentally, a drain cock 18 is provided at the bottom of the processing tank 2 for periodically discharging the precipitated hydroxyl-bonded mineral components.

Now, the water to be treated is sent from the water supply tank 1 to the upper space of the treatment tank 2 via the water pump 5 and the water pipe 4, and is injected in a sprinkling state by a water sprinkler 8 provided in the tank 2. The water level in the treatment tank 2 is detected between a predetermined high water level HL and a low water level L+- by the potential water level meter 1), and the water level is detected by the water pump 5 and the condensate pipe returning from the treatment tank 2 to the water supply tank 1. 6 and the condensate pump 7 are automatically controlled to maintain the average water level in the processing tank 2.

The water supplied into the treatment tank 2 is finely scattered by the water sprinkler 8 in the tank, resulting in a sudden increase in surface area. Hydrogen gas and corrosive gases contained in the water, dissolved gases such as CO2 and 02, and highly toxic volatile gases such as trichlorethylene dissolved in the water are degassed under reduced pressure and sent to the steam-water separator 13. is discharged to the outside of the tank through the

Water from which dissolved gases have been degassed passes between electrode 9 and bare electrode 10 of electrode group A provided in treatment tank 2, but as it passes through this electrode group, mineral components (metals) in the water are removed. salt) is subjected to the action of an oscillating electromagnetic field between the electrode pair at a frequency corresponding to the frequency of the alternating voltage from the power supply device 12. Most of the metal salts dissolved in water are in the form of hydrogen carbonate, as described in ii7, and are forcibly dissociated into metal ions and hydrogen carbonate ions by the action of the oscillating electromagnetic field. Hydrogen carbonate ions form carbon dioxide and hydroxide ions OH through a hydration reaction.
-, of which carbon dioxide CO□ is removed from the system as carbon dioxide gas by degassing under reduced pressure inside the tank.

On the other hand, while metal ions (mineral ions) in the water pass through the electrode group A, they are degassed by the reduced pressure in the tank 2.
As O□ is removed, it forms an affinity with the 0■-ion which increases, and precipitates as a hydroxyl group bond. As a result, as the ionization of mineral components in the water is accelerated, hydroxyl-bound compounds, which are non-adhesive precipitates, are liberated and precipitate at the bottom of the tank, resulting in a decrease in the concentration of mifural ions in the water to be treated. Further, the water to be treated becomes weakly alkaline due to the hydroxyl ions OH- generated as described above.

The precipitate deposited at the bottom of the tank is discharged by periodically opening the drain concavity 18. In this case, it is preferable to install a filter at the outlet to the condensate connecting pipe 6 at the bottom of the tank.

Note that the frequency of the alternating voltage applied to the electrode group A is determined in advance, since it is desirable to apply the oscillating electromagnetic field energy with maximum efficiency depending on the quality of the water to be treated, that is, the type and amount of dissolved mineral components. After confirming the quality of the treated water, the frequency of the alternating voltage applied to the electrode group A is variably adjusted to promote ionization of mineral components appropriate to the water quality.

Furthermore, in this embodiment, since the electrode group is made up of a bundle of multiple rod-shaped electrodes, the number of electrodes 9 and bare electrodes 10 that make up the electrode group can be rearranged in advance depending on the quality of the water to be treated. In other words, by appropriately changing the surface area ratio between the electrode 9 and the bare electrode 10, it is possible to optimally adjust the delivery and reception of oscillating electromagnetic field energy for ionization of mineral components.

Furthermore, in this embodiment, the treatment tank is configured to be equipped with a pressure reducing device, an electrode group, a power supply device, etc., so this treatment tank system can be connected to an existing water supply tank via a water supply pipe and a condensate pipe. The installation work can be completed just by doing this, and a system useful as a so-called unitized device can be constructed.

〔Effect of the invention〕

As described above, when treating water according to the present invention, by applying a θ voltage in the treatment tank, dissolved gases in the water to be treated and highly volatile organic detergents dissolved in the groundwater, such as trichlorethylene, can be removed. While degassing and removing carcinogenic substances, the vibrational and dynamic electromagnetic field energy promotes ion dissociation of mineral components dissolved in water, so these mineral components are precipitated and released as non-adhesive water affinities. By reducing the concentration of mineral ions in the water after treatment, it is possible to obtain purified water that is less likely to produce aggregated substances such as scale.

In addition, since an alternating voltage with adjustable frequency is applied to the electrode pair, the oscillating electromagnetic field energy supplied can be adjusted according to the quality of the water to be treated, making it easy to perform optimal treatment according to the target of treatment. It is.

[Brief explanation of the drawing]

Fig. 1 is an assembly system diagram showing the structure of a water purification treatment device according to an embodiment of the present invention, Fig. 2 is a perspective view schematically showing the structure of an electrode group, and Fig. 3 is a block diagram of the electrical equipment. be. 1: Water supply tank, 2: Processing tank, 3: Vacuum pump, 3a: Exhaust pipe, 4: Water supply connection pipe,
5: Water pump, 6: Condensate connection pipe, 7: Condensate pump, 8: Water sprinkler, 9: Electrode, 10: Bare electrode, 1
): Potential water level meter, 12: Electric Fi, device, 13: Steam/water separator, 14: Variable frequency forward/inverse variable l mulberry device, 15: Voltage amplification section, 16: Power amplification section, 17: Impedance manoching I/ Lance, 18: Drain pot, A: Electrode group, B: End plate made of insulating material. For patents) Head person 1) Hideyuki Fuchi Patent attorney Takeshi 1) Ken Ken 1', FIG, 2, FIG, 3

Claims (1)

Scope of Claims: (1) The water to be treated is passed through a treatment tank whose interior is in a reduced pressure state to deaerate the water, and inside the treatment tank, the water is covered with a pair of electrodes, at least one of which is coated with a dielectric material. By contacting the treated water and removing dissolved gas in the water to be treated under reduced pressure conditions in the tank, and applying an alternating voltage with a frequency adjusted in advance depending on the quality of the water to be treated between the electrode pair. A vibrating electromagnetic field is applied to the dissolved metal salt in the water to be treated between the electrode pair, and the ion dissociation of the metal salt in the water to be treated is promoted by electric vibrational energy, thereby forming the metal salt as a non-adhesive precipitate. A water purification method for water supply and distribution systems characterized by separation and removal. (2) The water purification method according to claim 1, characterized in that the frequency of the alternating voltage is tuned to a resonance frequency of an electric circuit between the pair of electrodes containing the water to be treated. (3) The water purification method according to claim 1, characterized in that the water to be treated is caused to flow in a direction intersecting a magnetic field or electric lines of force generated in the electrode pair. (4) A treatment tank having a means for introducing water to be treated and a means for taking out water after treatment, a depressurizing degassing means for maintaining the inside of the treatment tank in a reduced pressure state and degassing it, and water to be treated in the treatment tank. a pair of electrodes, at least one of which is coated with a dielectric material, arranged to be in contact with the electrode, a power supply device that applies an alternating voltage at a frequency that is pre-adjusted depending on the quality of the water to be treated between the pair of electrodes, and a treatment tank. means for separating and removing non-adhesive precipitates precipitated in the water to be treated in the tank; A water purification device for a water supply and distribution system characterized by applying oscillating electromagnetic field energy to dissolved metal salts in water to be treated using voltage. (5) The water purification according to claim 4, wherein the introducing means has a water sprinkling means for sprinkling the water to be treated in the upper space of the treatment tank, and the depressurizing and degassing means deaerates the upper space. Device. (6) The water purification device according to claim 4, wherein the power supply device includes a variable frequency power supply circuit that outputs an alternating voltage tuned to a resonant frequency of an electric circuit between the pair of electrodes containing the water to be treated. (7) The electrode pair includes a square lattice array electrode bundle consisting of a plurality of elongated parallel electrodes arranged along a direction intersecting the flow of the water to be treated in the treatment tank, and the water to be treated is in the electrode bundle. The water purification device according to claim 4, wherein the water flows through a gap. (8) The water purification device according to claim 7, wherein the electrodes are connected so that the directions of current flowing through each electrode of the electrode bundle are opposite to each other between adjacent electrodes in the lattice arrangement.