JPH06106169A - Method and apparatus for making sterilized water - Google Patents

Abstract

PURPOSE:To efficiently make water having high sterilizing power and to well keep electrolytic efficiency over a long period of time by a method wherein water to which chloride is added is subjected to ion exchange by a hydrogen substitution type ion exchange resin to be lowered in its pH value and electrolyzing this treated water or the water containing the treated water. CONSTITUTION:Sterilized water is produced by a method wherein chloride such as sodium chloride is added to the raw water of a water supply pipeline at first and a part or whole of this water is subjected to ion exchange treatment in a hydrogen substitution type ion exchange device 11 to be lowered in its pH value and the mixing ratio of the ion exchanged treated water and water not subjected to ion exchange treatment is adjusted to adjust a pH value to a predetermined value. A part or whole of water adjusted in its pH value is electrolyzed in an electrolytic cell 1 and the electrolytically treated water and diluting water not subjected to electrolytic treatment are mixed to adjust the pH of the produced electrolytic sterilized water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing sterilized water by electrolyzing water containing a chloride such as sodium chloride.

[0002]

A method and an apparatus for producing sterilized water by electrolysis of water added with hydrochloric acid and sodium chloride without a diaphragm is disclosed in, for example, JP-A-4-94785. In order to obtain strong sterilization efficiency with this type of sterilizing water, p
Although it is necessary to lower H, it has been uneconomical to increase the consumption of hydrochloric acid in the past because the pH was mainly lowered only by the addition amount of hydrochloric acid, and it was extremely difficult to lower the pH to 3 or less. Further, if the pH is lowered only by the addition amount of hydrochloric acid, the concentration becomes high, so that there are many problems in practical use such as damage as a drug, corrosion of piping and the like, and difficulty of neutralization treatment.

Further, generally, when electrolyzing water, calcium or the like tends to be deposited on the cathode side of the underwater electrolysis tank, which tends to hinder electrolysis efficiency. This problem is particularly great when calcium chloride is added as the chloride.

Therefore, it is an object of the present invention to easily and significantly lower the pH value of electrolytic sterilizing water by adding a relatively small amount of chloride, thereby obtaining water of low concentration and high sterilizing power. Moreover, it is an object of the present invention to provide a method and an apparatus for producing electrolytic sterilized water in which precipitation of calcium by electrolysis is suppressed.

[0005]

Means for Solving the Problems The method for producing sterilized water of the present invention for achieving the above-mentioned object is to ion-exchange water containing a chloride such as sodium chloride with a hydrogen-substituted ion exchange resin to adjust the pH value. It is characterized by lowering and electrolyzing the ion-exchange treated water or water containing the ion-exchange treated water.

Further, the sterilizing water production apparatus of the present invention for achieving the above object is a continuous water flow type electrolytic water conditioning apparatus for electrolyzing water supplied from a water supply line in an electrolytic cell and discharging it from a drain line. And; a chemical liquid supply device for adding chloride such as sodium chloride to the raw water of the water supply circuit; and a hydrogen substitution type ion exchange device interposed in a water supply pipe between the chemical liquid supply device and the electrolytic cell. And

The hydrogen exchange type ion exchange device is preferably provided on either one of the bifurcated bypass water supply lines,
The ion-exchanged water and the non-ion-exchanged water are mixed so that they can be supplied to the electrolytic cell.

[0008]

[Function] Addition of chlorides such as sodium chloride and calcium chloride increases chlorine ion, sodium ion or calcium ion in water. This water is ion-exchanged by the hydrogen-exchange-type ion exchange resin, and + ions such as sodium ions and calcium ions in the water are replaced with hydrogen ions of the ion-exchange resin. In this way, as a result of ion exchange of water containing a large amount of + ions such as sodium ions and calcium ions with the hydrogen substitution type ion exchange resin,
The hydrogen ions in the water increase and the pH value decreases.

By electrolyzing the water whose pH value has been lowered in advance as described above, the pH value of the electrolyzed sterilized water is further lowered and can be lowered to pH 2 or less.

On the other hand, as a result of the ion exchange by the hydrogen-exchange type ion exchange resin, sodium ions and calcium ions in the water are reduced, so that the precipitation of calcium and the like in the electrolyzed water is reduced.

The sterilizing water drained from the electrolytic cell has a pH value of
When it becomes 3 or less, chlorine gas is generated in the water, but this chlorine gas is removed from the air vent device of the drainage pipe, purified by activated carbon or the like, and then discharged into the atmosphere.

[0012]

EXAMPLES Basically, the sterilized water production method of the present invention basically comprises adding chlorides such as sodium chloride and calcium chloride to raw water, and ion-exchangeing all or part of this water with a hydrogen-substituted ionic resin. The pH value of water is lowered and calcium in the water is removed.After that, the ion-exchange treated water or the water containing it, which has lowered the pH value and reduced calcium ions, is electrolyzed in an electrolytic cell. hand,
It is possible to efficiently obtain electrolytic sterilized water having a low pH value (thus having a strong sterilizing power) and little calcium precipitation.

That is, when chlorides such as sodium chloride and calcium chloride are added to raw water, chlorine, sodium, calcium and the like in the water increase, but by exchanging this water with a hydrogen-exchange type ion exchange resin, + Ions such as sodium ions and calcium ions are replaced with hydrogen ions of the hydrogen-exchange-type ion exchange resin.
As a result, the hydrogen ions in the water increase and the pH drops.

As described above, by electrolyzing the water whose pH has been lowered in advance in the diaphragmless electrolytic cell, the pH value of the electrolytic sterilized water produced can be efficiently lowered to 2 or less, and highly sterilizable water can be obtained. Is obtained.

On the other hand, in the process of ion exchange, + ions such as sodium and calcium in the water are replaced with hydrogen ions of the ion exchange resin and taken in, so that the water supplied to the electrolytic cell contains chlorine necessary for sterilization. While holding
It becomes water with reduced calcium and other substances that cause precipitates. Therefore, adhesion of calcium and the like to the electrolytic cell cathode is greatly reduced.

FIG. 1 is a schematic configuration diagram of an apparatus for producing sterilizing water for carrying out the above method, in which 1 is a diaphragmless electrolytic cell,
2 is a water supply line for supplying raw water to the water supply section 1a of the electrolytic cell 1,
Reference numeral 3 is a drainage pipe for discharging the electrolytically treated water from the drainage portion 1b of the electrolytic cell 1, and constitutes a continuous water flow type electrolytic water conditioning apparatus as a whole.

The diaphragmless electrolytic cell 1 applies a DC voltage between the built-in negative electrode and positive electrode to electrolyze water passing between the electrodes, but in the embodiment shown in the figure, it branches from the water supply pipe line 2. The diluted water bypass pipe line 4 thus communicated with the drainage portion 1b of the electrolysis tank 1 via the flow rate control valve 5 allows a part of the water that is not electrolyzed to join with the electrolysis generated water of the electrolysis tank 1 as dilution water. Is done.

On the upstream side of the water supply line 2, there is installed a chemical liquid supply device 4 for adding chlorides such as sodium chloride (HCl) and calcium chloride (CaCl ₂ ) to raw water.
The chemical liquid supply device 4 of the embodiment shown in the figure includes a tank 7 for storing the chemical liquid, a chemical liquid supply pipe 8 for connecting the tank 7 and the water supply pipe line 2, a pump 9 interposed in the chemical liquid supply pipe 8 and a non-return. Valve 10
And a predetermined amount of chloride such as sodium chloride or calcium chloride is added to the raw water flowing through the water supply pipe line 2.

On the other hand, in the water supply pipe line 2, an ion exchange device 11 containing a hydrogen substitution type ion exchange resin is interposed downstream of the confluence portion of the chemical liquid supply pipe 6 and water containing chloride is added. All or part of the ion-exchange resin is subjected to ion-exchange treatment with a hydrogen-substituted ion-exchange resin.

In the illustrated embodiment, the chemical liquid supply pipe 8 of the water supply pipe 2 is shown.
A bypass circuit 2b is provided in the water supply pipe line 2a downstream of the confluence part with the ion exchange device 1 and the bypass circuit 2b is provided in the bypass circuit 2b.
1 is installed.

An opening / closing valve 12 is provided in the bypass circuit 2b for ion exchange, and when the opening / closing valve 12 is opened in cooperation with the throttle valve 13 of the raw water supply pipe 2a, a part of the raw water or the raw water is supplied to the bypass circuit 2b. All of them are designed to flow, and a bypass valve 14 is provided at the confluence of the bypass circuit 2b and the water supply conduit 2a so that the ion exchange water that has passed through the bypass circuit 2b is not ion-exchanged by adjusting the angle of the bypass valve 14. It is possible to adjust the ratio of water supplied as it is.

In the figure, 15 is a flow switch that detects the flow of water in the water supply pipe 2 and sends a control signal for the electrolytic cell 1, and 17 is a constant flow valve that keeps the flow rate of the water supply pipe constant. In place of the constant flow valve 17, or in combination with the constant flow valve 17, a metering pump is provided in the water supply pipe section 2c between the branch point of the bypass line 4 of the dilution water and the water supply section 1a of the electrolytic cell 1. 18 is provided so that the amount of water electrolyzed in the electrolytic bath 1 is constant.

The drain pipe 3 is provided with a mixing cylinder 19 so that the electrolyzed water generated from the electrolytic cell 1 and the dilution water supplied from the bypass circuit 4 are well mixed.

Further, on the downstream side of the mixing cylinder 19, there is provided a silver electrolysis section 20 for electrolyzing silver to elute silver ions in the electrolysis mixed water, whereby the electrolysis water is submerged in water. Silver hydroxide AgOH in which OH and Ag ions are combined
Is generated. Since silver sterilization has the strongest sterilizing power in the state of AgOH, by providing the silver electrolysis portion 20 in the drainage pipe 3 as described above, the silver sterilization treatment is further imparted to the electrolytic sterilization water.

In the present invention, chloride-added water is subjected to an ion exchange treatment with a hydrogen substitution type ion exchange resin,
It is possible to obtain sterilized water with high acidity of about pH 2 even if the pH value is lowered and electrolysis is performed without diaphragm.
Generally, chlorine sterilized water is dangerous when the pH value is 3 or less, because residual free chlorine is present in the state of toxic chlorine gas. Therefore, in the device of the present invention, the air vent device 21 is provided in the drainage pipe line 3 of the electrolytic cell 1, and the purification device 23 using activated carbon or the like is installed in the exhaust pipe 22 of the air vent device 21 to remove toxicity. The gas is released to the atmosphere.

If necessary, a chlorine / chlorine gas sensor 24 may be provided on the exhaust side of the purifying device 23 to detect the chlorine gas concentration, as shown in the figure.

Next, the operation of the sterilized water producing apparatus according to the present invention will be described. First, a chloride such as sodium chloride is added to the raw water of the water supply pipe 2a, and a part or all of this water is replaced with hydrogen-exchanged ions. Ion exchange processing is performed by the exchange device 11,
The pH value is lowered and the pH value is adjusted to a predetermined value by adjusting the mixing ratio of the ion exchange treated water and the water not subjected to the ion exchange treatment.

A part or all of the pH-adjusted water as described above is electrolyzed in the electrolytic cell 1, and the electrolytically treated water and the undiluted dilution water are mixed to adjust the pH of the electrolytically sterilized water produced. adjust.

The electrolytic sterilizing water is further given a sterilizing power by silver hydroxide in the silver electrolysis section 20.

When the produced sterilizing water contains chlorine gas, the chlorine gas is removed by an air venting device,
Safe and strong sterilizing water is obtained from the faucet 16, and chlorine gas is purified by a purifying device and released as harmless gas.

In the illustrated embodiment, the case where the electrolytic treatment is carried out in the non-diaphragm electrolytic cell is illustrated, but the present invention is not limited to this, and the pH is further increased from the anode chamber side by the diaphragm electrolysis.
It is also possible to obtain sterile water with a low value.

[0032]

Industrial Applicability As described above, according to the present invention, since chloride-added water is subjected to ion exchange with a hydrogen-exchange-type ion-exchange resin and then electrolyzed, the pH value of the water before electrolysis is low and the water having high bactericidal activity Can be efficiently generated.

Further, since chloride-added water is ion-exchanged, components necessary for producing sterilizing water such as chlorine are retained, and components such as calcium causing deposits are ion-exchange resin. Since it is absorbed, the electrolysis efficiency is well maintained over a long period of time.

[Brief description of drawings]

[1] Schematic configuration diagram of a sterilizing water production apparatus according to an embodiment of the present invention

[Explanation of symbols]

1 ... Electrolyzer, 2 ... Water supply line, 2b ... Bypass circuit,
3 ... Drainage pipe line, 4 ... Diluting water bypass circuit, 6 ... Chemical liquid supply device, 7 ... Chloride tank, 11 ... Hydrogen exchange type ion exchange device, 14 ... Bypass valve, 15 ... Flow switch, 16 ... Faucet, 17 ... Constant flow valve, 18
... metering pump, 19 ... mixing cylinder, 20 ... silver electrolysis section,
21 ... Air venting device, 23 ... Purification device, 24 ... Chlorine gas sensor

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[Procedure amendment]

[Submission date] March 31, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a sterilizing water manufacturing apparatus according to an embodiment of the present invention.

[Explanation of Codes] 1 ... Electrolytic tank, 2 ... Water supply pipe line, 2b ... Bypass circuit,
3 ... Drainage pipe line, 4 ... Diluting water bypass circuit, 6 ... Chemical liquid supply device, 7 ... Chloride tank, 11 ... Hydrogen exchange type ion exchange device, 14 ... Bypass valve, 15 ... Flow switch, 16 ... Faucet, ... … Constant flow valve, 1
8 ... Metering pump, 19 ... Mixing cylinder, 20 ... Silver electrolysis section,
21 ... Air bleeding device, 23 ... Purification device, 24 ... Chlorine gas sensor

Claims (4)

[Claims] 1. A method for ion-exchange water containing a chloride such as sodium chloride with a hydrogen-exchange ion exchange resin to lower the pH value, and electrolyzing the ion-exchange treated water or water containing the ion-exchange treated water. A method for producing sterilized water, comprising: 2. A continuous water flow type electrolytic water conditioner that electrolyzes water supplied from a water supply line in an electrolytic cell and discharges it from a drainage line; and chloride such as sodium chloride is added to raw water in a water supply circuit. A chemical liquid supply device; a sterilizing water production device comprising a hydrogen substitution type ion exchange device interposed in a water supply pipe line between the chemical liquid supply device and the electrolytic cell. 3. A water supply pipeline is bifurcated, a hydrogen substitution type ion exchange device is interposed in any of the pipelines, and the chemical liquid supply device is provided in a water circuit upstream of the ion exchange device. The sterilized water manufacturing apparatus according to claim 2, wherein 4. The sterilized water production apparatus according to claim 2 or 3, further comprising an air venting device provided in a drainage pipe of the electrolytic cell.