JP2001058181A - Method and apparatus for passing liquid into liquid passing type capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously obtain a desalted liquid by arranging liquid passing type capacitors in parallel to connect them and setting one of them to a process for removing an ion component of a liquid to be treated while setting the other one of them to a process for recovering the ion component of the liquid to be treated. SOLUTION: A liquid passing type capacitor 1 is equipped with first and second liquid passing type capacitors 1a, 1b which are connected to a supply source 5 of a liquid to be treated in common and arranged in parallel by mutually connecting desalted liquid outflow pipings. A DC power supply 34 is connected to a pair of the electrodes 30, 31 of the liquid passing type capacitor 1 and, when a liquid to be treated is passed through a column in such as state that DC voltage is applied across the electrodes, a pair of the electrodes 30, 31 adsorb ions to remove the ion component from the liquid to be treated to obtain a desalted liquid and, when a pair of the electrodes 30, 31 are short- circuited thereafter, ions are desorbed from a pair of the electrodes 30, 31 to obtain a conc. liquid wherein the ion component is recovered in high concn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a desalting solution in which ionic components of a liquid to be treated are removed by applying a DC voltage to a pair of electrodes held in the solution, and then a short circuit or reverse connection is performed. To regenerate a pair of electrodes and collect the removed ion components together with the liquid to be treated in the liquid, and remove the ion components of the liquid to be treated according to the purpose by passing through a liquid-flow condenser. Related to liquid method.

[0002]

2. Description of the Related Art A flow-through type condenser removes and recovers (regenerates) ionic components in a liquid to be treated by using electrostatic force, and its principle is as follows. In other words, the flow-through capacitor applies a DC voltage to a pair of electrodes held by the flow-through capacitor, and removes ionic components, charged particles, and organic substances of the liquid to be processed by adsorbing the pair of electrodes. Then, a desalted solution from which the ionic components have been removed is obtained, and then the pair of electrodes is short-circuited or a DC power supply is reversely connected to release the ionic components adsorbed on the pair of electrodes, thereby regenerating the pair of electrodes. The removal of the removed ion component together with the liquid to be treated in the liquid as a concentrated solution is repeatedly performed.

Such a flow-through type capacitor is disclosed in Japanese Patent Application Laid-Open
In one example of this known example, an inlet for introducing a liquid to be treated into a column, and an outlet for discharging a liquid from which ionic components have been removed are provided. Contains electrodes. Each of the pair of electrodes has a high-surface area conductive surface layer supported by a conductive support layer, and further includes a non-conductive porous spacer. Accordingly, the pair of electrodes is composed of a non-conductive porous spacer of one electrode, a conductive support layer, a high surface area conductive surface layer, a non-conductive porous spacer of the other electrode, a conductive support layer, and a high surface area conductive layer. It has a six-layer structure of a surface layer. This pair of electrodes is wound around a hollow porous central tube with the high surface area conductive surface layer inside, forming a cartridge. Lead wires extend from the conductive support layer of one electrode and the conductive support layer of the other electrode outside the column, and are connected to a DC power supply. A supply source of the liquid to be treated is connected to the inlet of the column, and a switching valve for separating a desalted solution from which the ionic components have been removed and a concentrated solution from which the ionic components have been recovered is connected to the outlet.

[0004] A method of passing a liquid through the above-mentioned liquid-passing type condenser will be described with reference to FIG. In FIG. 3, reference numeral 50 denotes a liquid-flow condenser. First, the switching valve 51 is opened, and the switching valve 52 is opened.
Is closed, the switch 53 is turned on, and the pair of electrodes 5
When a DC voltage is applied to the liquid supply 4 and 55 and the liquid to be treated is supplied from the liquid supply source 56 to the liquid condenser 50, the ion component is adsorbed on the pair of electrodes 54 and 55, and the switching valve 51
On the downstream side of the deionized water from which the ionic components have been removed.
If this state continues, the water component monitoring device 57 measures that the ionic components are gradually adsorbed to the pair of electrodes 54 and 55 and become saturated, and the ionic component removal performance gradually decreases. To turn off the DC voltage application. Then, the switching valve 51 is closed and the switching valve 52 is opened, and in order to regenerate the ion component removal performance, the switch 58 is turned on to short-circuit the pair of electrodes 54 and 55, or the DC power supply 59 is turned off. When the connection is reversed, the ionic component adsorbed on the pair of electrodes 54 and 55 is released, and a concentrated solution in which the ionic components are recovered on the downstream side of the switching valve 52 is obtained while the pair of electrodes 54 and 55 is being regenerated. One cycle of removal and recovery (regeneration) of the ionic component in the liquid to be treated is completed. Then, the liquid to be treated is constantly supplied from the liquid supply source 56 to the flow-through condenser 50,
By repeating the above cycle, a desalted solution from which the ionic components have been removed and a concentrated solution from which the ionic components have been recovered can be obtained alternately.

[0005]

However, according to the above-mentioned conventional method of passing a liquid through a condenser, the switching valve 51,
Since 52 is switched to alternately obtain a desalted solution or a concentrated solution, there is a problem that both of these solutions cannot be obtained continuously.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flow-through method for a flow-through condenser which can continuously obtain a desalted solution.

[0007]

Under such circumstances, the present inventors have made intensive studies and as a result, have found that after applying a DC voltage to a pair of electrodes to remove ionic components of the liquid to be treated during the passage of the liquid. Use a flow-through capacitor that recovers the ionic components accumulated in the electrodes by short-circuiting or reverse-connecting, and arrange and connect the flow-through capacitors in parallel. During the component removal process, if the other flow-through condenser is in the process of recovering the accumulated ionic components, the liquid to be treated is always passed, and the desalted solution from which the ionic components have been removed is continuously fed. They have found that they can be obtained and have completed the present invention.

That is, according to the first aspect of the present invention, a direct current voltage is applied to a pair of electrodes to remove ionic components of a liquid to be processed in a flowing solution to obtain a desalted solution. A direct current power supply is reversely connected, and a flow-through condenser for collecting the removed ionic component as a concentrated solution together with the liquid to be processed is connected and connected in parallel. During the step of removing the ionic component, the other flow-through condenser is in the process of recovering the ionic component of the liquid to be treated, and always passes the liquid to be treated, and the desalted solution from which the ionic component has been removed or the ion It is an object of the present invention to provide a method for passing a liquid through a condenser, wherein a concentrated liquid in which components are concentrated is continuously obtained.

Further, the invention of claim 2 is to measure the liquid quality of the desalted liquid from which the ionic component of the liquid to be treated has been removed and the concentration of the concentrated liquid from which the ionic component has been recovered by the flow-through condenser. 2. The flow-through condenser according to claim 1, wherein a timing of collecting the desalted solution from which the ionic components have been removed and a concentrated solution from which the ionic components have been collected is determined based on the measured value of the quality of each liquid. Is provided.

Further, according to a third aspect of the present invention, a DC voltage is applied to a liquid supply source to be treated and a pair of electrodes to remove ionic components of the liquid to be treated during passage, and the pair of electrodes is short-circuited or short-circuited. Reversely connecting a DC power supply, a liquid-flow condenser for recovering the removed ionic component into the liquid to be processed, and a supply pipe for connecting the liquid-to-be-processed supply source and the liquid-flow condenser; A flow-through condenser device having an outflow pipe connected to the outflow side of the through-flow condenser, a desalinate outflow pipe and a concentrate outflow pipe branched from the outflow pipe into two parts and provided with a switching valve on the way. Are provided in parallel, the desalted liquid outflow pipes are connected to each other, and the concentrated liquid outflow pipes are connected to each other.

Further, the invention of claim 4 provides the liquid-flow condenser device according to claim 3, wherein the liquid supply source is used as a common liquid supply source. is there.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of a method of passing a liquid through a flow-through condenser according to an embodiment of the present invention with reference to FIGS. FIG. 1 is a flow chart showing a method for passing a liquid through a condenser according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the relationship between the conductivity of the effluent of the condenser and time. In the drawing, a liquid-passing condenser 1 includes a first liquid-passing condenser 1a and a second liquid-passing condenser 1b, and the upstream side thereof is connected to a processing liquid supply source 5 by a supply pipe 3 and a supply pipe 4. On the other hand, the downstream side is connected to a first water quality monitoring device 8 and a second water quality monitoring device 9 by a connection pipe 6 and a connection pipe 7, respectively. And
These first water quality monitoring device 8 and second water quality monitoring device 9
Both are connected to a first automatic valve 12 and a second automatic valve 13 by a connection pipe 10 and a connection pipe 11, and the first automatic valve 12 and the second automatic valve 13 are connected to each other by a connection pipe 14. Further, the first automatic valve 12 is connected to a concentrate recovery tank 16 by a connection pipe 14 and a collective discharge pipe 15 (concentrate discharge pipe), and a connection pipe 17 and a collective discharge pipe 18
(Desalinated liquid outlet pipe) is connected to the desalted liquid recovery tank 19. Further, the second automatic valve 13 is connected to the desalinated liquid collecting tank 19 by the connection pipe 20 and the collective discharge pipe 18 (desalted liquid outflow pipe).
And a connection pipe 21 and a connection pipe 15 (concentrated liquid outflow pipe) to a concentrated liquid recovery tank 19. As described above, the first liquid-passing condenser 1a and the second liquid-passing condenser 1b share the liquid-to-be-processed liquid supply source 5, connect the desalting liquid outflow pipes, and connect the concentrated liquid outflow pipes, thereby forming a parallel connection. Are located in

Each of the first and second flow-through capacitors 1a and 1b has a pair of electrodes 30, 31.
, And both electrodes 30 are connected to the cathode of a DC power supply 34 via switches 32 and 33, and both electrodes 31 are connected to the anode of the DC power supply 34. A pair of electrodes 30 and 31 of the first flow-through capacitor 1a is connected to a switch 35.
, And the pair of electrodes 30 and 31 of the second flow-through capacitor 1b are connected to each other via a switch 36. The operation control of the devices shown in FIG. 1 is performed by a known control device such as a sequencer or a microcomputer. The detailed operation control includes, for example, a method of passing a liquid through a condenser described later. No.

The structure of the liquid-passing type capacitor 1 is not particularly limited. For example, electrodes 30 and 31 in which a high-surface-area activated carbon is in contact with a collecting electrode such as metal or graphite are accommodated in a column. In which a non-conductive spacer is interposed. Then, this liquid-flow condenser 1
When a DC power source 34 is connected to the pair of electrodes 30 and 31 and a liquid containing ions is passed through the column in a state where a DC voltage, for example, 1 to 2 V is applied, the pair of electrodes 3
0 and 31 adsorb the ions, the ionic components are removed, and a desalted solution can be obtained.
Is short-circuited, the ions that have been electrically neutralized and adsorbed are separated from the pair of electrodes 30 and 31, and the pair of electrodes 30, 3
1 can be regenerated, and a concentrated liquid in which a concentrated ionic component is recovered can be obtained.

As another example of the structure of the liquid-passing type capacitor 1, a pair of electrodes, which are activated carbon layers mainly composed of activated carbon having a high specific surface area, are arranged with a spacer made of a non-conductive porous liquid-permeable sheet interposed therebetween. Then, a pair of collector electrodes are arranged outside the electrodes, and a flat plate shape is further provided with a pressing plate outside the collector electrodes, a DC power supply is connected to the collector electrodes, and a short circuit between the collector electrodes or a DC power supply is further provided. A reverse connection may be performed. Also,
The electrode and the collecting electrode may be integrated.

The liquid-to-be-treated supply source 5 comprises a liquid-to-be-treated tank and a liquid-to-be-processed from which two liquid-flow condensers 1 are connected.
a and 1b, and a liquid feed pump for independently and quantitatively supplying them (not shown). In addition, the first water quality monitoring device 8 and the second water quality monitoring device 9 are not particularly limited as long as they are liquid measurement devices, and are not particularly limited as long as they are index measuring devices capable of accurately grasping the degree of ion removal. And a resistivity meter, and in this embodiment, a conductivity meter. The first automatic valve 12 and the second automatic valve 13 are three-way valves, each of which has upstream receiving ports 12a and 13a, collecting ports 12b and 13b, removing ports 12c and 13c, and receiving ports 12a and 13a. First water quality monitoring device 8
And the second water quality monitoring device 9 has collection ports 12b and 13
b indicates that the concentrate recovery tank 16 has removal ports 12c and 13c.
Are connected to the desalting liquid recovery tank 19, respectively.

Next, a method of passing a liquid through the liquid-flow condenser according to the present invention will be described with reference to FIGS. In FIG. 1, first,
The liquid to be treated is passed through the flow-through condenser 1a. That is, the switch 35 is turned off, the switch 32 is turned on, and a DC voltage is applied to the pair of electrodes 30 and 31 so that the first automatic valve 12 is turned off.
Is operated to the recovery port 12b, the first water quality monitoring device 8 can be monitored, the pump of the liquid supply source 5 is operated, and the liquid to be processed is quantitatively supplied to the first liquid condenser 1a. . The liquid to be treated is adsorbed on the pair of electrodes 30 and 31 of the first flow-through condenser 1a to form a desalted solution from which the ionic components have been removed, and the conductivity is measured by the first water quality monitoring device 8. . However, since the desalinated solution has a high conductivity in the first operation stage and does not sufficiently remove ionic components, the recovery port 12b of the first automatic valve 12 is not used.
Then, it is discharged to the concentrated liquid recovery tank 16 through the connection pipe 14 and the collective discharge pipe 15. When a high-concentration ionic component is required, the ionic component-removed solution in the first operation stage is returned to the liquid to be treated without being put in the concentrated solution recovery tank 16 or is transferred to another solution. Operate to end the first operating phase.

Next, when the electric conductivity measured by the first water quality monitoring device 8 reaches the liquid sampling possible value shown in FIG.
2 is operated to the removal port 12c, and the liquid from which the ionic components have been removed is discharged to the desalted liquid recovery tank 19. That is, for the first time at this stage, the first flow-through condenser 1a enters the ion component removing step.

When this state is continued, the ion adsorbing capacity of the pair of electrodes approaches a saturated state, the ion removing ability decreases, and the conductivity of the desalted solution gradually increases. When the electric conductivity measured by the first water quality monitoring device 8 becomes the uncollectable value shown in FIG. 2, the first automatic valve 12 is operated to the collection port 12b,
Immediately turn off the switch 32 to stop applying the DC voltage,
Further, the switch 35 is turned on to short-circuit the pair of electrodes 30 and 31, the adsorbed ionic component is separated from the pair of electrodes 30, 31 and moved to the liquid side to regenerate the pair of electrodes 30, 31 and concentrate. The liquid is discharged to the concentrated liquid recovery tank 16. That is, the first flow-through condenser 1a enters a recovery step of the ionic component, that is, a regeneration step.

On the other hand, in the second liquid-flow condenser 1b, the initial operation stage of the first liquid-flow condenser 1a and the subsequent ion component removing step are performed in a similar manner. The same regeneration process is started. That is, when the first liquid-flow condenser 1a is in the ionic component removing step, the second liquid-flow condenser 1b is in the ionic component removing step, and when the first liquid-flow condenser 1a is in the ionic component removing step, The two-liquid condenser 1b is in an ionic component recovery step.

The ion component removing step and the ion component recovering step are repeatedly performed, and a steady operation has been started.
When the flow-through condenser 1a is in the ionic component removing step, the second automatic valve 13 is operated to the recovery port 13b, and the switch 36 is turned on and the switch is turned on, because the second flow-through condenser 1b is in the ionic component recovery step. Reference numeral 33 is turned off to short-circuit the pair of electrodes 30 and 31, the adsorbed ionic component is separated from the pair of electrodes 30 and 31, and moved to the liquid side to regenerate the pair of electrodes 30 and 31.

The concentrated liquid from which the ionic components have been recovered is sent to the concentrated liquid recovery tank 16 through the connecting pipe 21 and the collecting pipe 15. When the conductivity of the concentrated liquid discharged from the second flow-through condenser 1b is measured by the second water quality monitoring device 9, it is determined that the concentration can be collected, and the supply of the liquid to be treated is stopped. The flow-through condenser 1b enters a standby state.
In addition, in order to continuously obtain the concentrated liquid from which the ionic components have been recovered, the flow speed at the time of recovery can be reduced to eliminate the waiting time.

When the first water quality monitoring device 8 measures the uncollectable value shown in FIG. 2, the process proceeds to the regeneration process of the ion component recovery process of the first flow-through condenser 1a. That is, the first automatic valve 1
2 is operated to the collection port 12b, the switch 32 is turned off, and the switch 35 is turned on to short-circuit the pair of electrodes 30 and 31 to regenerate the pair of electrodes 30 and 31. Then, the concentrated liquid from which the ionic components have been recovered is put into the concentrated liquid recovery tank 16.
Next, when the first water quality monitoring device 8 measures the value that can be collected,
The first automatic valve 12 is switched to the removal port 12c to stop sending the effluent to the concentrated liquid recovery tank 16, and the desalted liquid recovery tank 19 is stopped.
Then, the first flow-through condenser 1a enters an ion component removing step.

When the first liquid-flow condenser 1a enters the ion component recovery step, the second liquid-flow condenser 1b enters the ion component removal step. That is, the switch 33 is turned on, the switch 36 is turned off, and the second automatic valve 13 is removed from the port 13c.
The desalting solution from which the ionic components have been removed is sent to the desalting solution recovery tank 19.

In one flow-through condenser, the above-mentioned removal step and recovery step are made into one cycle, and by repeating this cycle, a desalted solution having a low ion concentration is continuously obtained from the liquid to be treated, and concentrated. A liquid can also be obtained. As described above, the use, saturation, and regeneration of the pair of electrodes 30 and 31 of the first liquid-flow type capacitor 1a and the second liquid-flow type capacitor 1b are repeated. Immediately before the step of removing the first liquid-flow condenser 1a is completed, the second liquid-flow condenser 1b is subjected to an initial desalination step (desalting blow step).
It is preferable to keep it.

In the above embodiment, the parallel arrangement of the flow-through condensers is performed by two units. However, the present invention is not limited to this, and three or more units may be arranged in parallel in the present invention.

[0027]

According to the present invention, the flow-through condensers are arranged and connected in parallel, so that when one of the desalinated liquids is obtained, the concentrated liquid is obtained from the other, so that the desalinated liquid is continuously obtained. Liquid or concentrated
A contracted liquid can be obtained. Further, the liquid quality of the desalted liquid and the concentrated liquid is measured, and the timing of collecting both liquids is determined based on the measured values, so that both liquids can be obtained in accordance with the purpose of collecting liquid.

[Brief description of the drawings]

FIG. 1 is a flow chart showing a method for passing a liquid through a liquid-flow condenser according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing the relationship between the conductivity of the effluent and the time in the method for passing a fluid through a fluid-flow condenser according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a method of passing a liquid through a conventional liquid-passage type condenser.

[Explanation of symbols]

 1,50 Liquid-flow condenser 1a First liquid-flow condenser 1b Second liquid-flow condenser 3,4 Supply pipe 6,7,10,11,14,17,20 Connection pipe 5,56 Treatment liquid supply source 8 First water quality monitoring device 9 Second water quality monitoring device 12 First automatic valve 12a, 13a Receiving port 12b, 13b Recovery port 12c, 13c Removal port 13 Second automatic valve 16 Concentrated liquid recovery tank 15, 18 Collecting discharge pipe 19 Desalination Liquid recovery tank 30, 31, 54, 55 Electrode 32, 33, 35, 36, 53, 58 Switch 34, 59 DC power supply 51, 52 Switching valve 57 Water quality monitoring device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D061 DA01 DB18 DC19 EA02 EB04 EB05 EB14 EB16 EB29 EB31 EB37 EB39 GA21 GC02 GC14 GC16

Claims (4)

[Claims] 1. A direct current voltage is applied to a pair of electrodes to remove a ionic component of a liquid to be treated in a flowing solution to obtain a desalted solution. Thereafter, the pair of electrodes is short-circuited or a direct current power supply is reversely connected. ,
A flow-through condenser for recovering the removed ionic component as a concentrated solution together with the liquid to be processed in the liquid is arranged and connected in parallel, and one of the flow-through condensers is in the step of removing the ionic component of the liquid to be processed, The other flow-through condenser is in the process of recovering the ionic components of the liquid to be treated, and always passes the liquid to be treated, and the desalted solution from which the ionic components have been removed or the concentrated solution in which the ionic components have been concentrated. A method for passing a liquid through a condenser, wherein the liquid is continuously obtained. 2. The liquid type condenser is used to measure the liquid quality of the desalted solution from which the ionic components of the liquid to be treated are removed and the liquid quality of the concentrated liquid from which the ionic components are recovered, and to measure the liquid quality of each liquid. 2. The method according to claim 1, wherein the timing of collecting the desalted liquid from which the ionic components have been removed and the concentrated liquid from which the ionic components have been recovered is determined based on the value. 3. A liquid supply source to be treated and a DC voltage applied to a pair of electrodes to remove ionic components of the liquid to be treated during the passage.
Short-circuit the pair of electrodes or reverse connect a DC power supply,
A flow-through condenser for collecting the removed ionic components into the liquid to be processed in the flow-through, a supply pipe connecting the liquid-to-be-processed liquid supply source and the liquid-flow condenser, and an outlet side of the liquid-flow condenser. A plurality of flow-through condenser devices each having a connected outflow pipe, a desalted liquid outflow pipe and a concentrated liquid outflow pipe branched from the outflow pipe into two, and provided with a switching valve in the middle, are arranged in parallel. A flow-through type condenser device, wherein the desalted liquid outflow pipes are connected to each other, and the concentrated liquid outflow pipes are connected to each other. 4. The liquid-flow condenser device according to claim 3, wherein the liquid supply source is used as a common liquid supply source.