JP2001191077A - Method for manufacturing desalting liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a desalting liquid which is capable of easily yielding the desalting liquid with extremely simple constitution and hardly requires maintenance for performance maintenance. SOLUTION: A liquid passage condenser 1 having a regenerating stage of obtaining the desalting liquid by impressing a DC voltage to a pair of electrodes 15 and 16 and removing the ion components of the liquid to be treated and a regenerating stage for recovering the ion components from a pair of the electrodes 15 and 16 together with the liquid to be treated under passage by electric dissociation is connected with a valve 4 to a piping 3 for supplying a liquid to be treated which is connected to the liquid passage condenser 1. The valve 4 is opened when the desalting liquid is needed. The desalting liquid is obtained in a desalting stage. The operation to close the valve 4 and then the regenerating stage are started when the desalting liquid is not needed. The ion components are removed and recovered with the remaining liquid in the liquid passage condenser 1 and the liquid to be treated which is passed in the time lag from the beginning of the closing of the valve before the end of the closing, by which the desalting liquid may be easily obtained with the extremely simple constitution and the need for the maintenance for performance maintenance is substantially eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for applying a DC voltage to a pair of electrodes to obtain a desalinated solution from which ionic components of a liquid to be processed are removed, and thereafter, when no desalting solution is required. The present invention relates to a method for producing a desalinated solution in which a pair of electrodes is regenerated exclusively and a desalinated solution can be easily obtained in preparation for a case where a desalinated solution is required again.

[0002]

2. Description of the Related Art Conventionally, methods for producing a desalted solution include an ion exchange method (IER) filled with an ion exchange resin, a distillation method,
There are a reverse osmosis membrane method (RO), an electrodialysis method (ED), and an electric deionized liquid manufacturing method (EDI). These methods are used alone or in combination to produce a desalted solution, and any of them can obtain a desalted solution. However, in the IER, the ion-exchange resin must be regenerated with an acid-alkali, and the degraded ion-exchange resin needs to be replaced. A lot of maintenance is required to maintain performance, such as the need to replace the resin. In the distillation method, heating and cooling are required, and if heat is recovered, the configuration of the apparatus becomes complicated, and it is difficult to use it as a simple method for producing a desalinated liquid. RO requires a sufficient treatment in the previous stage, and requires a high-pressure pump, making it difficult to use as a simple desalting solution production method. The ED uses the electrodialysis function, but requires a large amount of electric power, and particularly consumes a large amount of electric power in a high-purity liquid. EDI combines an ion exchange resin and an electrodialysis function, and has the advantage of requiring no operation for regenerating the ion exchange resin with a chemical and requiring less power than the ED. Liquid system,
Since three systems of the electrode liquid passing system are required, the device configuration becomes complicated.
Therefore, even if the above-mentioned desalting solution production method can obtain a high-purity desalting solution, it is difficult to use it as a simple and inexpensive desalting solution production method.

On the other hand, as a simple method for producing a desalted liquid, a method using a flow-through condenser is known. This liquid passing condenser removes and recovers (regenerates) ionic components and the like in the liquid to be treated using electrostatic force, and the principle is as follows. That is, the flow-through capacitor applies a DC voltage to the pair of electrodes held by the flow-through capacitor, and adsorbs ionic components and the like of the liquid to be processed during the flow, ie, ions, charged particles, and organic substances to the pair of electrodes. To obtain a desalinated solution from which ionic components and the like have been removed, and then turn off the DC power supply and short-circuit the pair of electrodes or reversely connect the DC power supply to perform electrical dissociation to form a pair of electrodes. The ion components and the like adsorbed on the surface are desorbed, and the removed ion components and the like are removed together with the liquid to be treated while the pair of electrodes are regenerated.
The collection is repeatedly performed (Japanese Patent Laid-Open No. 5-2 / 1993).
No. 58992).

[0004] The construction of the apparatus for producing a desalinated liquid using the above-mentioned liquid passing condenser and its operating method are as follows. As shown in FIG. 12, reference numeral 50 denotes a liquid passing condenser. First, the switching valve 51 is opened and the switching valve 52 is closed,
When the switch 53 is turned on to apply a DC voltage to the pair of electrodes 54 and 55 and supply the liquid to be processed from the liquid tank 56 to the liquid condenser 50, the pair of electrodes 54 and 55 to which the DC voltage is applied is applied. The deionized solution from which the ionic components and the like have been removed is obtained, and is stored in the desalted solution storage tank 57 downstream of the switching valve 51.
When this state continues, the water quality monitoring device 58 measures that the ion components and the like are gradually adsorbed to the pair of electrodes 54 and 55 and become saturated, and the performance of removing the ion components and the like is gradually reduced. The switch 53 is turned off to stop applying the DC voltage. Then, the switching valve 51 is closed,
The switching valve 52 is opened, and the switch 59 is turned on to short-circuit the pair of electrodes 54 and 55 (or the DC power supply 60 is reversely connected) in order to regenerate the performance of removing ion components and the like.
Then, the ionic components and the like adsorbed on the pair of electrodes 54 and 55 are desorbed, and a concentrated solution of the ionic components and the like is obtained while the pair of electrodes 54 and 55 are regenerated. One cycle of removal and recovery (regeneration) of the ionic components and the like in the liquid to be processed is stored in the tank 61. Then, the liquid to be treated is constantly supplied from the liquid tank to be treated 56 to the liquid passing condenser 50, and the above-described cycle is repeated, whereby the desalted liquid and the ionic component concentrated liquid can be obtained alternately.

[0005]

The above-described method for producing a desalted liquid using the liquid-passing condenser 50 employs a liquid tank 56 to be treated.
, The liquid to be treated is constantly supplied to the liquid passing condenser 50, and the switching valves 51 and 52 are switched to alternately obtain the desalted liquid → the ionic component concentrated liquid → the desalinated liquid → the ionic component concentrated liquid to obtain the ionic component concentrated liquid. If the desalting solution storage tank 57 having a necessary volume during the time during which the solution is obtained is provided, the desalting solution can always be continuously obtained, which is convenient. However, in the desalinated liquid manufacturing method using the liquid passing condenser 50, when it is not necessary to continuously obtain the desalinated liquid, the desalinated liquid storage tank 57, the concentrated liquid storage A tank 61 is also provided, which is a substantially excessive device configuration. In addition, there is no simple method for producing a desalted liquid, such as the necessity of putting the liquid passing condenser 50 itself in a completely liquid-sealed container. Therefore, the conventional method for producing a desalinated solution cannot meet the needs when a desalinated solution is to be obtained in a small amount and intermittently.

Accordingly, it is an object of the present invention to provide a method for producing a desalinated solution in which the structure of the apparatus is extremely simple, a desalinated solution can be easily obtained, and almost no maintenance is required for maintaining the performance. .

[0007]

Under such circumstances, the present inventors have made intensive studies and as a result, have established an apparatus configuration in which a valve is connected to a liquid supply pipe to be processed of a flow-through condenser having a desalination step and a regeneration step. When the desalting solution is needed, the valve is opened to obtain a desalting solution as a desalting step, and when the desalting solution is not needed, the operation of closing the valve is started, and the regeneration step is started. If the ionic components are removed with the liquid and the liquid to be processed that has passed through the time lag from the start of closing the valve to the end of closing the valve, the desalting solution can be easily obtained with an extremely simple apparatus configuration, and the performance is maintained. The inventors have found that almost no maintenance is required, and have completed the present invention.

That is, the invention of claim 1 provides a desalting step of applying a direct current voltage to a pair of electrodes to remove an ionic component of a liquid to be treated to obtain a desalted solution; A regenerating step of recovering together with the liquid to be processed which is being passed through by electric dissociation, a valve is connected to the liquid supply pipe or the processing liquid discharge pipe connected to the liquid flow condenser, and desalination is performed. When the liquid is needed, the valve is opened and a desalted liquid is obtained as the desalting step. Then, when the desalting liquid is not needed, the operation of closing the valve is started. It is an object of the present invention to provide a method for producing a desalted liquid, characterized by removing and recovering ionic components from the remaining liquid in the liquid and the liquid to be processed which has passed through a time lag from the start of closing the valve to the end of closing the valve.

Further, the invention of claim 2 provides a desalting step of applying a DC voltage to a pair of electrodes to remove ionic components of the liquid to be treated to obtain a desalted solution, A regenerating step of recovering together with the liquid to be processed which is being passed through by electric dissociation, a valve is connected to the liquid supply pipe or the processing liquid discharge pipe connected to the liquid flow condenser, and desalination is performed. When the liquid is not needed, the valve is closed, and then the pair of electrodes are short-circuited or the DC power supply is reverse-connected, so that the ionic component recovery liquid is retained in the liquid passing condenser. A method for producing a desalted liquid, characterized in that a valve is opened to discharge the ionic component recovery liquid, and then a DC voltage is applied to a pair of electrodes to obtain a desalted liquid as the desalting step. is there.

[0010] Further, the invention according to claim 3 is a desalination step of applying a DC voltage to a pair of electrodes in a storage tank to remove an ionic component of a liquid to be treated to obtain a desalination solution; A regenerating step of recovering the ionic component from the electrode together with the liquid to be processed through electrical dissociation by electric dissociation. It is connected to the system, performs a desalting step when a desalting solution is required, obtains a desalting solution in the storage tank, and performs a regeneration step exclusively when the desalting solution is unnecessary, and the regeneration step is performed from the storage tank. Removing the liquid-passing condenser, connecting the liquid-passing condenser to a separately-installed liquid flow path, passing the liquid through the liquid-passing condenser, and electrically dissociating to remove and recover ionic components. A liquid production method is provided.

The invention according to a fourth aspect is a desalting step of applying a DC voltage to a pair of electrodes in a circulation channel of the liquid to be treated to remove ionic components of the liquid to be treated to obtain a desalinated solution. And a regenerating step of recovering the ionic component from the pair of electrodes together with the liquid to be processed through the liquid by electrical dissociation, and circulating by applying a DC voltage to the pair of electrodes. The ionic components of the liquid to be treated are adhered to the pair of electrodes to convert the circulating liquid to be treated into a desalted liquid. Thereafter, the circulating desalted liquid is taken out when necessary, and the regeneration step is started when unnecessary. And a method for producing a desalted liquid characterized by removing and recovering ionic components attached together with the desalted liquid.

Further, according to a fifth aspect of the present invention, a desalted liquid is removed by applying a DC voltage to a storage tank, a pump, and a pair of electrodes in a circulation channel of the liquid to be treated to remove ionic components of the liquid to be treated. A desalination step to obtain, and a flow-through condenser and a take-out valve having a regeneration step of recovering the ionic component from the pair of electrodes together with the liquid to be processed through the flow by electric dissociation, are arranged. Applying a DC voltage, the ionic components of the circulating liquid to be treated are attached to the pair of electrodes, and the circulating liquid to be treated is desalted, and then, when necessary, the take-out valve is opened to remove the desalted liquid. It is another object of the present invention to provide a method for producing a desalted solution, wherein the method is characterized in that the desalted solution is taken out, enters the regeneration step when unnecessary, and removes and recovers the ionic components attached together with the desalted solution.

[0013] The invention according to claim 6 is a desalination step of applying a DC voltage to a pair of electrodes to remove an ionic component of the liquid to be treated to obtain a desalinated solution, in a lower part in the storage tank. A regenerating step of recovering the ionic component from the pair of electrodes together with the liquid to be processed through the liquid by electrical dissociation. In addition to ensuring the desalted liquid amount and the residual liquid amount for regeneration, the liquid to be treated can be circulated in the liquid passing condenser, and a DC voltage is applied to the liquid passing condenser to be treated in the storage tank. The ionic component of the liquid is attached to the pair of electrodes to convert the liquid to be treated in the storage tank into a desalted liquid. Thereafter, a necessary amount of the desalted liquid is taken out from the storage tank when necessary, and the regenerating step is performed when unnecessary. Into the storage tank for regeneration in the storage tank. There is provided a desalted solution producing method characterized by the ion component in the desalted solution recovered is, and remove and collect by be excluded from the reservoir tank.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to FIGS. FIG. 1 is a flow chart showing a method for producing a desalted liquid according to a first embodiment of the present invention,
FIG. 2 is a schematic diagram showing an enlarged cross section of a portion surrounded by a chain line in FIG. In FIGS. 1 and 2, an inlet 2 is connected to a liquid supply system to be processed by a liquid supply pipe 3 to be processed, and an automatic valve 4 is provided in the liquid supply pipe 3, on the upstream side of the liquid flow condenser 1. The downstream side of the liquid condenser 1 has an outlet 5
A short pipe 6 is connected to the outlet 5 as it is or as necessary. A water quality monitoring device 7 is connected to the short pipe 6 as needed.

The structure of the liquid-passing capacitor 1 is not particularly limited. Here, a non-conductive separator 10 having liquid-permeability and a pair of high-surface-area conductive surface layers sandwiching the non-conductive separator 10 from both sides. And electrodes 15 and 16 comprising a pair of current collectors 13 and 14 disposed outside the pair of high surface area conductive surface layers 11 and 12, respectively. Gasket 17 for stopping
And are integrally fixed by bolts 18. As described above, both sides of the non-conductive separator 10 become the inlet 2 and the outlet 5, and the current collector 13 of one electrode 15 extends to become a lead wire 19. Connected to the anode of power supply 21. The current collector 14 of the other electrode 16 extends to become a lead 22, which is connected to the cathode of a DC power supply 21. Further, the electrodes 15 and 16 are connected to the leads 19 and 22.
Through the switch 23 (short-circuit wiring).

In the condenser 1, a DC power supply 21 is connected to at least a pair of electrodes 15 and 16, and a DC voltage and
For example, when a liquid to be treated is passed through the non-conductive separator 10 from the inlet 2 in a state where 1-2 V is applied, a pair of electrodes 1
5 and 16 can adsorb ionic components such as ions, charged particles, and organic substances in the liquid to be treated to obtain a desalted solution from which the ionic components have been removed (desalting step). Thereafter, when the pair of electrodes 15 and 16 were short-circuited, the electrically adsorbed ions were separated from the pair of electrodes 15 and 16, and the pair of electrodes 15 and 16 were regenerated and a rich ion component was recovered. A concentrated solution can be obtained (regeneration step). The operation control of the devices shown in FIGS. 1 and 2 is performed by a known control device such as a sequencer or a microcomputer, and the detailed operation control includes, for example, a desalting solution manufacturing method described later. . The voltage applied between the pair of electrodes 15 and 16 can be set arbitrarily.

The automatic valve 4 used in the present embodiment is not particularly limited, but is preferably an electric valve having a slight time lag in opening and closing like an electric valve. The reason is that if there is a time lag, the liquid to be treated is completely closed even if the pair of electrodes 15 and 16 are short-circuited and the automatic valve 4 starts to be closed when the regeneration process is started from the desalting step. And the separated ion components are washed away with the desalting solution and the liquid to be treated.
Can be reproduced. Even when using an automatic valve with no time lag, a pair of electrodes 1
Short-circuit 5 and 16 and wash away the separated ionic components with the desalting solution and the liquid to be treated. Open the automatic valve 4 until the pair of electrodes 15 and 16 is regenerated, and then close the automatic valve 4 to control the operation. However, the same effect as in the above case can be obtained.

The outlet 5 of the condenser 1 may be left as it is, or a short pipe 6 may be connected, and a water quality monitoring device 7 may be connected to the short pipe 6. The water quality monitoring device 7 can accurately grasp the timing for regenerating the pair of electrodes 15 and 16 by measuring the liquid quality of the desalted liquid. Usually, this water quality monitoring device 7 is not particularly limited as long as it is a measuring device of an index capable of measuring liquid quality and accurately grasping the degree of ion removal, and examples thereof include a conductivity meter and a resistivity meter.
In this embodiment, it is conductivity.

Next, a method for producing a desalted liquid according to the first embodiment will be described with reference to FIGS. In FIG. 1 and FIG. 2, the automatic valve 4 is opened when the desalting solution is needed, and the desalting solution is obtained from the outlet 5 or the short pipe 6 as a desalting step. At the same time as the closing operation is started, the regeneration process is started, and the remaining liquid in the liquid passing condenser 1 and the liquid to be processed passed through the time lag from the start to the end of the closing of the automatic valve 4 are used to remove ionic components. .

That is, first, the switch 23 is turned off and the switch 20 is turned on to apply a DC voltage to the pair of electrodes 15 and 16.
If the water quality monitoring device 7 is present, it is placed in a monitoring enabled state, and if the automatic valve 4 is opened, the liquid to be treated enters the flow-through condenser 1 and immediately enters the desalination step. The desalted liquid having the ionic components adsorbed on the sample 16 is collected from the short tube 6. For example, if there is a water quality monitoring device 7 for measuring conductivity, the conductivity is measured. In this case, since the conductivity is high in the first operation stage, the ionic component is not sufficiently removed to obtain a desalted solution. Collect the desalted liquid.
After a certain amount of the desalted solution is collected, if there is a sufficient time for not collecting the desalted solution, although the water quality of the desalted solution slightly varies, the water quality monitoring device 7 is not particularly installed. May be.

When the desalting solution is continuously collected from the liquid passing condenser 1, the pair of electrodes 15 and 16 become saturated, and the quality of the obtained desalting solution gradually decreases. If the water quality monitoring device 7 is provided, the process is switched to the regeneration process when the conductivity of the desalted liquid rises and approaches an uncollectable value. Also, judging from the required time of the desalting step of the liquid passing condenser 1, if the switching point to the regeneration step is earlier, there is no problem even without the water quality monitoring device 7. That is, the automatic valve 4 is started to be closed, the switch 20 is turned off to stop the application of the DC voltage, and the switch 23 is turned on to short-circuit the pair of electrodes 15 and 16 to start the regeneration step. Next, the regeneration step is completed by completely closing the automatic valve 4. In this case, since the automatic valve 4 has a time lag from the start of closing to the fully closed state, the adsorbed ion component is separated from the pair of electrodes 15 and 16, washed out together with the desalted solution and the liquid to be treated, and the pair of electrodes 15 and 16 is removed. Can be played.

In the present embodiment, in addition to the above-described method, the automatic valve 4 is closed when the desalting solution is unnecessary, and thereafter,
The pair of electrodes 15 and 16 are short-circuited or a DC power supply is connected in reverse to allow the ionic component recovery liquid to pass through the condenser 1. Then, when the desalting solution is required, the automatic valve 4 is opened to open the ionic component recovery liquid. And then a pair of electrodes 1
It is also possible to obtain a desalted solution by applying a DC voltage to 5 and 16 as a desalting step. Further, in the present embodiment, in addition to the above-described method, a method of installing the automatic valve 4 in the middle of the treatment liquid discharge pipe 6 instead of the middle of the water supply pipe 3 may be adopted.

According to the first embodiment, the desalting solution from which the ionic components have been easily and easily removed can be easily and easily removed by repeating this cycle with the desalting step and the regeneration step as one cycle. Obtainable. Further, almost no maintenance is required for maintaining the performance, and it is possible to meet the demand for obtaining desalinated water in a small amount and intermittently.

Next, a method for producing a desalted liquid according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4 are explanatory diagrams of the method for producing a desalted liquid according to the present embodiment. 3 and 4, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. The different points will be mainly described. That is, in the second embodiment of the present invention, the difference from the first embodiment is that the flow-through condenser 1 is detachably installed in the storage tank 30, for example, above the storage tank 30, This liquid passing condenser 1 is directly connected to the liquid supply system 70 to be treated,
The point is that the desalting step is carried out when the desalting solution is required, the desalting solution is obtained in the storage tank 30, the desalting solution is taken out from the storage tank 30 when necessary, and the regeneration step is performed exclusively when the desalting solution is unnecessary.

In FIG. 3, the liquid-passing condenser 1 is mounted on an installation table 32 which divides the inside of the tank into two. The installation table 32 has a filter-like shape provided with, for example, a mesh 32a, on which the liquid passing condenser 1 is placed and the obtained desalted liquid is passed downward. Next, in the regeneration step to be performed, the liquid passing condenser 1 is removed from the storage tank 30 and connected to a separately installed liquid flow path 71, for example, a tap faucet 31, and tap water is passed through the liquid passing condenser 1 and This is to electrically dissociate and remove and recover ionic components and the like in the liquid passing condenser 1. In the present embodiment, the installation position of the installation table 32 may be a central portion or an upper portion in the storage tank 30. For example, the upper end of the storage tank 30 may be used. The structure outside the tank 30 is also included. Further, the liquid-passing capacitor 1 may be a separate member that can be connected to a main body portion including a non-conductive separator, an electrode plate, a current collector, and a lead wire, and a power supply portion including a DC power supply, a switch, and wiring.

In the second embodiment, the desalinated solution can be easily obtained with a simple structure, and the tapping water tap can be used for the regeneration step. It can be used anywhere, including inside and outside.

Next, a method for producing a desalted liquid according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flow chart of the method for producing a desalted liquid according to the present embodiment. In FIG. 5, the same components as those of the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and different points will be mainly described. That is, the third embodiment of the present invention is different from the first embodiment in that the storage tank 35 installed in the circulation flow path 34 from the liquid supply system 70 by the automatic valve 33. The liquid to be treated is supplied by the on / off control, and the liquid flow condenser 1 is arranged and connected to the circulation flow path 34. A DC voltage is applied to the liquid flow condenser 1 to apply the ionic component of the circulating liquid to be treated. To a pair of electrodes 15, 16
And gradually removes the circulating water from the circulating water and removes the circulating desalinated liquid when necessary, enters the regeneration process when not needed, and removes and recovers ionic components and the like adhering together with the desalinated liquid. Is to do. The circulation of the desalted solution may be continued even if the pair of electrodes reaches saturation.

In FIG. 5, the circulation flow path 34 is connected to the liquid supply condenser 1 by a liquid supply pipe 3 to be treated provided with a pump 36 in a storage tank 35, and a three-way discharge valve 37 is provided downstream of the liquid supply condenser 1. And a pipe 39 connecting the circulation port 37 a of the three-way discharge valve 37 and the storage tank 35. That is, while the liquid to be treated put into the storage tank 35 is circulated through the circulation channel 34 by the pump 36, the circulating water becomes a desalinated liquid, and the storage tank 3
5 is transformed into a desalting liquid storage tank. Thereafter, the desalted liquid is taken out from the take-out port 37b of the three-way take-out valve 37 when necessary. When it is necessary to regenerate the liquid-passing condenser 1 because the amount of the desalinated liquid in circulation is small or the electrode is saturated and the desalinated liquid cannot be obtained, the circulation of the three-way discharge valve 37 is performed. The port 37a is closed, the regeneration step is started, and the ionic components and the like adhering together with the desalting solution are removed and collected from the extraction port 37b.

According to the third embodiment, in the conventional method for producing a desalinated liquid using a liquid passing condenser, at least two tanks, ie, a liquid tank to be treated and a desalinated liquid storage tank, are required. However, the required amount of the desalting liquid can be manufactured by installing one liquid tank to be treated. For this reason, the installation cost can be reduced without taking up an installation place.

Next, a method for producing a desalted liquid according to a fourth embodiment of the present invention will be described with reference to FIGS. 6 shows the state before the start of the desalting step, FIG. 7 shows the desalting step, FIG. 8 shows the state of taking out the desalted liquid, FIG. 9 shows the regeneration step, and FIG. 10 shows the concentrated liquid of the ionic component. Shows a state in which is discharged. Each of these figures is schematically shown. FIG.
In FIG. 10, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and different points will be mainly described. That is, the fourth embodiment of the present invention is different from the first embodiment in that the liquid passing condenser 1 is housed in the lower part of the storage tank 40 and the storage liquid supply system 70 An arbitrary amount of the liquid to be treated is introduced into the tank 40 to secure the required amount of the desalted liquid and the amount of the residual liquid for regeneration, and the liquid to be treated can be circulated in the liquid passing condenser 1. 1 is applied with a DC voltage to convert the ionic components of the liquid to be treated in the storage tank 40 into a pair of electrodes 1.
The circulating water is made to adhere to 5 and 16 to make the desalinated liquid. Thereafter, a necessary amount of the desalinated liquid is taken out from the storage tank 40 when necessary, and a regeneration step is started when unnecessary. The ionic component is recovered in the desalted solution remaining for regeneration, and the ionic component concentrated solution is removed from the storage tank 40. That is, as shown in FIG. 6, the liquid to be treated is charged into the storage tank 40 from the charging port 41, the switch 20 is turned on, the switch 23 is turned off, and the storage tank 4 is turned off.
The liquid to be treated in 0 is a desalted liquid (see FIG. 7). Next, after the desalinated solution is poured out from the inlet 41 of the storage tank 40 while leaving the remaining amount of liquid for regeneration (see FIG. 8), the switch 20 is turned off, the switch 23 is turned on, and the desalted liquid in the storage tank 40 is turned off. The ionic components attached to the pair of electrodes 15 and 16 are collected in the salt solution (see FIG. 9), and the concentrated liquid of the ionic components is stored in the storage tank 40.
(See FIG. 10).

In the fourth embodiment, the storage tank 4
0 may be provided with an outlet other than the inlet 41. The installation position of this outlet may be any of the bottom part and the side wall part of the storage tank 40. If an outlet is provided at the bottom of the storage tank 40 and a short pipe having a cock valve is connected,
As shown in FIGS. 8 and 10, the desalted solution can be collected and the concentrated solution can be discharged without tilting the container. Also,
It is more convenient if the cock valves are installed in two places, upper and lower, where the upper part is a position where the concentrated liquid does not flow out and the lower part is a position where the concentrated liquid flows out. Furthermore, if the storage tank and the power supply unit are separated from each other by using electromagnetic induction from outside to supply power to the liquid-passing condenser in the storage tank, the water-sealing property to the storage tank and the durability of the electrical connection unit are improved. . In this case, the electromagnetic induction section may be installed at the installation location of the storage tank.

In the third and fourth embodiments shown in FIGS. 5, 6 to 10, the desalted liquid is circulated through the liquid condenser 1. This circulation is used in the desalination process.
Even if the electrode of the flow-through condenser is saturated with the ionic component, it is preferable to perform the operation continuously, since an effect of sterilizing water in the circulation system can be obtained. That is, FIG. 11 shows the number of viable cells when a DC voltage is applied to the liquid passing condenser and the desalinated liquid is circulated through the liquid condenser (in FIG. 11, the CP operating circulating desalinated liquid), and the liquid passing condenser is stopped. This is a comparison of the viable cell count in the case where the circulating fluid was circulated (CP stop circulating fluid in the figure). Here, cfu is used to express the viable cell count.
(Colony forming unit). According to FIG.
The viable cell count of the P-operating circulating desalted liquid is small and constant regardless of the passage of time, but the viable cell count of the CP stopped circulating liquid increases with the passage of time. Although the cause is not clear, it is presumed that fungi in the liquid were adsorbed to the electrodes of the flow-through condenser, or that the flow-through condenser had an electrochemical bactericidal action, or a combination of these effects. You.

Examples of application of the method for producing a desalted liquid of the present invention include household electric appliances utilizing desalinated water and industrial appliances utilizing desalinated water. Examples of the demineralized water used in household electric appliances using demineralized water include humidifier water, steam iron water, fuel cell make-up water, and air conditioner cooling water. Examples of the desalinated water used in the industrial desalinated water utilization equipment include cooling water for air conditioning equipment used in moving objects such as aircraft, automobiles, and trains, and makeup water for fuel cells.

[0034]

According to the first and second aspects of the present invention,
With a simple configuration that simply connects a valve to the liquid supply pipe for the liquid to be treated, switching between the desalination process and regeneration process of the liquid flow capacitor is extremely easy with the ON / OFF operation of the DC power supply and the combination operation of the valve. Since it can be performed, a required amount of the desalting solution can be secured when necessary. Also,
Both the initial cost and the running cost can be significantly reduced, and this is extremely effective when desalinated water is required for household demineralized water-using electric equipment and industrial demineralized water-using equipment.

According to the third aspect of the present invention, a simple structure in which the liquid-passing condenser is detachably installed in the storage tank, and after the required amount of the desalting solution is secured, the regeneration step does not require the desalting solution. It can be easily performed with a small amount of work, and the same effect as the above invention can be obtained.

According to the fourth and fifth aspects of the present invention, the deionized liquid is circulated through the circulating flow path of the liquid to be treated with a simple structure in which a condenser is provided in the circulating flow path of the liquid to be treated. After the required amount of the desalted solution is secured, the regeneration step can be easily performed with a small amount of work when the desalted solution is not required, and the same effect as the above invention can be obtained. In addition, even after the pair of electrodes are saturated with the ionic component, by continuously circulating the desalted solution, bacterial growth of the circulating desalted solution can be suppressed.

According to the sixth aspect of the present invention, even with a simple configuration in which a liquid-passing condenser is disposed in a storage tank, after a required amount of desalinated liquid is secured, the regenerating step can be performed slightly when desalinated liquid is not required. The operation can be easily performed, and the same effect as the above invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a method for producing a desalted liquid according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an enlarged cross section of a portion surrounded by a two-dot chain line in FIG.

FIG. 3 is a diagram illustrating a method for producing a desalted liquid according to a second embodiment of the present invention.

FIG. 4 is a view showing a regeneration step in the method for producing a desalted liquid shown in FIG. 3;

FIG. 5 is a flowchart showing a method for producing a desalted liquid according to a third embodiment of the present invention.

FIG. 6 is a diagram illustrating a method for producing a desalted liquid according to a fourth embodiment of the present invention.

FIG. 7 is a view showing a desalting step in the desalting solution production method of FIG.

FIG. 8 is a diagram showing removal of a desalinated liquid in the method for producing a desalinated liquid of FIG. 6;

9 is a diagram showing a regeneration step in the method for producing a desalted liquid in FIG.

FIG. 10 is a diagram showing removal of a concentrated solution in the method for producing a desalted solution of FIG. 6;

FIG. 11 is a characteristic diagram showing the relationship between the number of viable bacteria in the CP operating circulating desalinated liquid and the CP stopped circulating liquid and elapsed time.

FIG. 12 is a flowchart showing a conventional method for producing a desalted liquid.

[Explanation of symbols]

 1, 50 Flow-through condenser 2 Inlet 3 Liquid supply pipe to be treated 4, 33 Automatic valve 5 Outlet 6 Short pipe 7, 58 Water quality monitoring device 10 Non-conductive separator 11, 12 High surface area conductive surface layer 13, 14 Current collector plate 15, 16, 54, 55 Electrode 17 Gasket 18 Volt 19, 22 Lead wire 20, 23, 53, 59 Switch 21, 60 DC power supply 30, 35, 40 Storage tank 31 Water tap 32 Installation table 34 Circulation flow path 36 Pump 37 Three-way extraction valve 37a Circulation port 37b Extraction port 38, 39 Piping 41 Inlet 51, 52 Switching valve 56 Treated liquid tank 57 Demineralized liquid storage tank 61 Concentrated liquid storage tank 70 Treated liquid supply system 71 Tap water supply system

Claims (6)

[Claims] 1. A desalting step of applying a DC voltage to a pair of electrodes to remove an ionic component of a liquid to be treated to obtain a desalted solution, and flowing the ionic component from the pair of electrodes by electric dissociation. And a regeneration step of recovering together with the liquid to be treated, wherein a valve is connected to a liquid to be treated supply pipe or a treatment liquid discharge pipe connected to the liquid to pass condenser, and the valve is connected when desalting liquid is required. Opening and obtaining a desalted liquid as the desalting step, and then starting the operation of closing the valve when the desalting liquid is unnecessary, entering the regeneration step, entering the regenerating step, the residual liquid in the liquid passing condenser and the valve A method for producing a desalted liquid, comprising removing and recovering ionic components from a liquid to be treated that has passed through a time lag from the start of closing to the end of closing. 2. A desalting step of applying a DC voltage to a pair of electrodes to remove an ionic component of a liquid to be treated to obtain a desalted solution, and flowing the ionic component from the pair of electrodes by electric dissociation. A regenerating step of recovering together with the liquid to be treated, wherein a valve is connected to the liquid to be treated supply pipe or the treatment liquid discharge pipe connected to the liquid passage condenser, and the valve is connected when the desalting liquid is unnecessary. Then, the pair of electrodes is short-circuited or a DC power supply is connected in reverse to allow the ionic component recovery liquid to stay in the liquid passing condenser, and then, when a desalting solution is required, open the valve to open the ionic component. A method for producing a desalted liquid, comprising discharging the collected liquid, and thereafter applying a DC voltage to a pair of electrodes to obtain a desalted liquid in the desalting step. 3. A desalting step of applying a DC voltage to a pair of electrodes in a storage tank to remove ionic components of a liquid to be treated to obtain a desalted solution, and electrically converting the ionic components from the pair of electrodes. A liquid-passing condenser having a regeneration step of recovering together with the liquid-to-be-processed in the liquid-passing by dissociation, is detachably installed, and the liquid-passing condenser is connected to a liquid-to-be-treated supply system through a flow path of the liquid to be treated, A desalinating step is performed in the storage tank when a desalting liquid is required, and a desalting liquid is obtained in the storage tank.When the desalting liquid is unnecessary, a regeneration step is performed exclusively.The regeneration step removes the liquid passing condenser from the storage tank. A method for producing a desalted liquid, wherein the method is connected to a separately provided liquid flow path, passes through the liquid-passing condenser, and is electrically dissociated to remove and recover ionic components. 4. A desalting step in which a DC voltage is applied to a pair of electrodes in a circulation flow path of a liquid to be treated to remove an ionic component of the liquid to be treated to obtain a desalted liquid. And a regeneration step of recovering the ionic component together with the liquid to be processed through the liquid by electric dissociation. The components were adhered to the pair of electrodes to turn the circulating liquid to be treated into a desalted solution. Thereafter, the circulating desalted solution was taken out when necessary, and when unnecessary, the regeneration process was started and adhered together with the desalted solution. A method for producing a desalted liquid, comprising removing and recovering ionic components. 5. A desalting step of applying a DC voltage to a storage tank, a pump, and a pair of electrodes in a circulation flow path of a liquid to be treated to remove an ionic component of the liquid to be treated to obtain a desalted liquid; A recirculation step of recovering the ionic component from the pair of electrodes together with the liquid to be processed through the liquid by electrical dissociation; and a discharge valve, and circulating by applying a DC voltage to the pair of electrodes. The ionic components of the liquid to be treated are attached to the pair of electrodes, and the liquid to be treated in circulation is desalted.
A method for producing a desalted liquid, characterized in that the desalting liquid is taken out by opening the take-out valve when necessary, and the regenerating step is started when not necessary, and the ionic components attached together with the desalted liquid are removed and collected. 6. A desalting step of applying a DC voltage to a pair of electrodes to remove a ionic component of a liquid to be treated to obtain a desalinated solution in a lower portion of the storage tank, and removing the ionic component from the pair of electrodes. And a regenerating step of recovering together with the liquid to be passed through the liquid by electrical dissociation.The liquid passing condenser is housed, and the liquid to be treated is charged into the storage tank, and the required amount of desalted liquid and In addition to securing the remaining liquid amount for regeneration, the liquid to be treated can be circulated in the liquid-passing condenser, and a DC voltage is applied to the liquid-passing condenser to form a pair of ionic components of the liquid to be treated in the storage tank. The liquid to be treated in the storage tank is made into a desalinated solution by attaching it to an electrode, and thereafter, a necessary amount of the desalinated solution is taken out from the storage tank when necessary, and when unnecessary, the regeneration process is started. To the remaining desalted solution for the regeneration of A method for producing a desalted liquid, comprising recovering components and removing and recovering the components by removing them from the storage tank.