JP2014087784A - Purified water production device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which can produce purified water having a high dissolved hydrogen concentration.SOLUTION: In a purified water production device, a water softener (1), an adsorber (2), an electrolytic water storage tank (6), and an RO device (3) are connected in this order, a permeate outlet line (15) of the RO device (3) is connected to a permeate tank (5), a concentrate outlet line (17) is connected to an electrolytic water production device (4), and the electrolytic water production device (4) is connected to the electrolytic water storage tank (6).

Description

  The present invention relates to a production apparatus for producing purified water that can be used as artificial dialysis water or the like.

  Artificial dialysate is produced by mixing purified water (artificial dialysate water) and dialysate stock solution, and many artificial dialysate production devices and methods have been proposed.

Conventionally, a method for producing tap water by treating it with a prefilter, a water softening device, an activated carbon device, or a reverse osmosis membrane has been known (paragraph number 0005 of Patent Document 1).
Patent Document 1 discloses an invention for producing artificial dialysis water containing dissolved hydrogen by processing in the order of a prefilter, a water softening device, an activated carbon device, an electrolyzed water generator, and a reverse osmosis membrane as an improvement means of the prior art. Is disclosed (FIG. 1 of Patent Document 1).
The process flow of the invention is illustrated in FIG. However, in FIG. 4, the filtration process (prefilter) of FIG. 1 of Patent Document 1 is omitted.
According to this production method, it is described that artificial dialysis water having a high dissolved hydrogen concentration can be produced. However, when the concentration of ions contained in raw water such as tap water or groundwater is low, electrolysis efficiency is lowered. In some cases, it is difficult to obtain a desired dissolved hydrogen concentration. In addition, the amount of water used as artificial dialysis water relative to the supply raw water is the amount of water obtained by subtracting the RO concentrated waste water from the supply raw water in a normal RO device, whereas when using an electrolyzer. In addition, the amount of water to be subtracted also adds electrolyzer drainage, which causes a problem that water use efficiency (recovery efficiency) decreases.
Furthermore, the wastewater from the electrolyzer will be partially discharged from the pretreated water that has been pretreated by the prefilter, water softening device, and activated carbon device. There is also a problem. In addition, it is necessary to install an electrolytic water tank, and there are problems in terms of downsizing and space saving of the dialysis water production apparatus.

Japanese Patent No. 4004523

An object of the present invention is to provide a production apparatus for producing purified water which can be used as tap water or groundwater having a low ion concentration and can be used as artificial dialysis water having a high dissolved hydrogen concentration.
Another object is to provide a space-saving production device for producing purified water that can be used as artificial dialysis water containing dissolved hydrogen, which has high water utilization efficiency (recovery efficiency) relative to the raw feed water. To do.

The invention of claim 1 is a solution to the problem.
An apparatus for producing purified water having an electrolyzed water production device (4), an electrolyzed water storage tank (6), and a reverse osmosis membrane device (RO device) (3),
It is connected so that raw water is supplied to the RO device (3),
The concentrated water line of the RO device (3) is connected to the electrolyzed water production device (4).
The electrolyzed cathode water line of the electrolyzed water production device (4) is connected to the electrolyzed water storage tank (6),
Provided is an apparatus for producing purified water, in which an electrolyzed water storage tank (6) is connected to an RO device (3).

The invention of claim 2 is a solution to the problem.
Water softener (1), adsorption device (2), electrolyzed water production device (4), electrolyzed water storage tank (6), reverse osmosis membrane device (RO device) (3) and RO device treated water (permeate) tank ( 5) A purified water production apparatus having
Water softener (1), adsorption device (2), electrolyzed water storage tank (6), and RO device (3) are connected in this order,
The permeate line (15) of the RO device (3) is connected to the permeate tank (5),
The concentrated water line (17) of the RO device (3) is connected to the electrolyzed water production device (4),
Provided is an apparatus for producing purified water in which an electrolyzed cathodic water line (19) of an electrolyzed water producing apparatus (4) is connected to an electrolyzed water storage tank (6).

The invention of claim 4 is a solution to the problem.
Water softener (1), adsorption device (2), electrolyzed water production device (4), electrolyzed water storage tank (6), reverse osmosis membrane device (RO device) (3) and RO device treated water (permeate) tank ( 5) A purified water production apparatus having
Water softener (1), adsorption device (2) and RO device (3) are connected in this order,
The permeate line (24) of the RO device (3) is connected to the permeate tank (5),
The concentrated water line (26) of the RO device (3) is connected to the electrolyzed water production device (4),
The electrolyzed cathode water line (28) of the electrolyzed water production device (4) is connected to the electrolyzed water storage tank (6),
An apparatus for producing purified water is provided in which an electrolyzed water storage tank (6) is connected to a line (23) between an adsorption device (2) and an RO device (3).

The invention of claim 6 is a means for solving the problems.
Water softener (1), adsorption device (2), electrolyzed water production device (4), electrolyzed water storage tank (6), reverse osmosis membrane device (RO device) (3) and RO device treated water (permeate) tank ( 5) A purified water production apparatus having
Water softener (1), adsorption device (3) and RO device (3) are connected in this order,
The permeate line (44) of the RO device (3) is connected to the permeate tank (5),
The concentrated water line (46) of the RO device (3) is connected to both the electrolyzed water production device (4) and the discharge line (47),
The electrolyzed cathode water line (50) of the electrolyzed water production device (4) is connected to the electrolyzed water storage tank (6),
The electrolyzed water storage tank (6) is connected to the line (43) between the adsorption device (2) and the RO device (3),
Furthermore, the return line from the electrolyzed cathode water line (51) between the electrolyzed water storage tank (6) and the line (43) between the adsorption device (2) and the RO device (3) to the electrolyzed water storage tank (6) ( 53). A device for producing purified water is provided.

According to the production apparatus of the present invention, it is possible to provide a production apparatus for producing purified water having a high dissolved hydrogen concentration stably even in tap water or groundwater having a low ion concentration.
In addition, dissolved hydrogen-containing artificial dialysis water having high water utilization efficiency (recovery efficiency) relative to the raw feed water can be produced. Furthermore, compared to the conventional method, a space-saving manufacturing apparatus can be provided by reducing the number of electrolyzed water manufacturing apparatuses, reducing the amount of pretreatment equipment, and reducing the size of the electrolyzed water tank.

The conceptual diagram which shows the manufacturing apparatus (manufacturing flow) of the purified water of this invention. The conceptual diagram which shows the manufacturing apparatus (manufacturing flow) of the purified water which is other embodiment of this invention. The conceptual diagram which shows the manufacturing apparatus (manufacturing flow) of the purified water which is further another embodiment of this invention. The conceptual diagram which shows the manufacture flow of the water for artificial dialysis of a prior art.

(1) Purified water production apparatus in FIG. 1 A raw water line 11 is connected to a source of raw water (tap water or groundwater).
The raw water is sent to the water softener 1 by driving a raw water pump 61 installed in the raw water line 11. In addition, a pre filter can be installed before the water softener 1 as needed. Moreover, both or one of the water softener 1 and the adsorption device 2 can be omitted, and when both are omitted, the source water line 11 can be connected to the pretreatment water tank 6. At this time, raw water is supplied from the pretreatment water tank 6 to the RO device 3 at the start of operation.

The water softener 1 is for reducing the density | concentration of the hardness component (calcium ion, magnesium ion, etc.) in raw water.
As the water softener 1, a commercially available water softener can be used.
The water whose hardness component concentration is reduced in the water softener 1 is sent from the line 12 to the adsorption device 2.

The adsorption device 2 is a case in which an adsorbent such as activated carbon or zeolite is filled in a case.
The adsorption device 2 is a device for mainly removing residual chlorine and the like by adsorption.
The water softener 1 and the adsorption device 2 serve as a pretreatment device for reducing the load on the RO device.
The water from which residual chlorine and the like are removed by the adsorption device 2 is sent from the line 13 to the pretreatment water tank 6 and stored therein.
In this way, the entire amount of pretreated water treated by the pretreatment device including the water softener 1 and the adsorption device 2 (hereinafter referred to as “pretreatment”) is sent to the pretreatment water tank 6 to be stored and supplied to the RO device. Is done.
In the apparatus of Patent Document 1 (FIG. 4), part of the pretreated water electrolyzed by the electrolyzed water production apparatus is discharged as acidic water. There is a need to. On the other hand, in the preprocessing apparatus of FIG. 1, since it is not necessary to preprocess discharge | emission part extra, compared with the apparatus of patent document 1, the preprocessing apparatus itself can be reduced in size.
The same effect can be obtained with the purified water production apparatus shown in FIGS.

  A raw water tank is provided in the raw water line 11 in front of the pretreatment device including the water softener 1 and the adsorption device 2 from the raw water supply source, and the raw water is supplied from the raw water tank to the pretreatment device through the raw water line 11. May be. Providing the raw water tank makes it easy to control the flow rate and pressure of the raw water sent to the pretreatment device. Therefore, the flow rate of pretreatment water sent from the pretreatment device and the amount of electrolytic cathode water sent from the electrolyzed water production device 4 This is preferable because it can be adjusted with good balance.

The pretreated water in the pretreated water tank 6 is sent to the RO device 3 from the line 14 by driving the pump 62 and is filtered.
The RO apparatus 3 can use a well-known thing, for example, the apparatus model VCR40 series, VCR80 series, NER40 series, NER80 series, SHR series etc. which are sold from Daisen Membrane Systems Co., Ltd. can be used. .

The permeated water obtained by the RO device 3 is sent from the line 15 to the permeated water tank (RO water tank) 5 and stored therein.
In the permeated water, ions remaining in the pretreated water are further removed, and the electrical conductivity is reduced to about 1 to 20 μS.
The permeated water (RO water) in the permeated water tank 5 is purified water, which is collected from the line 16 and used as medical purified water such as artificial dialysate water.

The concentrated water obtained by the RO device 3 is sent from the line 17 to the electrolyzed water production device 4 and electrolyzed. A part (excess amount) of the concentrated water may be drained from the line 18a.
In the concentrated water, ions removed by the RO device 3 are concentrated, and the electrical conductivity (ion content) is increased to about three times that of the raw water.

The electrolyzed water production device 4 is for electrolyzing the concentrated water obtained by the RO device 3 to obtain electrolytic cathodic water and electrolytic anodic water.
Since the concentrated water has a high electrical conductivity, the current value when electrolyzed in the electrolyzed water production apparatus 4 can be increased. For this reason, as a result of the electrolysis of water being promoted, the electrolyzed cathode water obtained by the electrolyzed water production apparatus 4 has a higher dissolved hydrogen concentration.
In the conventional method, when raw feed water with low electrical conductivity is used, electrolysis efficiency is low and it is difficult to obtain a sufficient dissolved hydrogen concentration. However, by using RO concentrated water, water with increased electrical conductivity is electrolyzed. Thus, electrolytic cathodic water having a high dissolved hydrogen concentration can be obtained.
As the electrolyzed water production apparatus 4, known ones can be used. For example, the electrolyzed cathodic water apparatus (paragraph number 0041) described in Japanese Patent No. 3933403 and the electrolyzed water described in Japanese Patent No. 4004523 are disclosed. A generator (paragraph 0030) and a commercially available electrodialysis water conditioner (trade name TRIM HD-24D) manufactured by Nippon Trim Co., Ltd. can be used.

The cathodic water (electrolytic cathodic water) having a high dissolved hydrogen concentration obtained by the electrolyzed water production apparatus 4 is sent from the line 19 to the pretreatment water tank (electrolyzed water storage tank) 6 and stored therein.
The acidic water (electrolytic anodic water) obtained by the electrolyzed water production apparatus 4 is drained from the line 18b.

In the purified water production apparatus of FIG. 1, an ultrafiltration membrane device can be installed between the electrolyzed water storage tank (pretreatment water storage tank) 6 and the RO device 3 for the purpose of removing microorganisms. .
In FIG. 1, reference numerals 101, 102, 103, and 104 denote open / close valves such as solenoid valves, which open and close each line by appropriately opening and closing depending on the operating state of the purified water production apparatus. It is.
In each line in FIG. 1, an on-off valve can be appropriately installed as necessary.

Next, an embodiment of a preferred operation method of the purified water production apparatus shown in FIG. 1 will be described.
When the operation is started, the raw water is processed in the order of the water softener 1, the adsorption device 2, and the RO device 3, and the permeated water (RO water) is stored in the permeated water tank 5.
At this time, the permeated water stored in the permeated water tank 5 can be collected as it is and used as artificial dialysis water or the like, but the dissolved hydrogen concentration in the permeated water is not yet high at this stage.
For this reason, it is desirable that the permeated water first stored in the permeated water tank 5 from the start of operation is not immediately collected, and the operation is further continued.

Electrolyzed cathodic water having a high dissolved hydrogen concentration is obtained by electrolyzing the concentrated water (water having a high ion concentration) generated in the RO device 3 using the electrolyzed water production device 4.
The electrolytic cathodic water having a high dissolved hydrogen concentration is sent from the line 19 to the pretreatment water tank (electrolyzed water storage tank) 6 and stored therein.
For this reason, the dissolved hydrogen concentration in the pretreatment water tank (electrolyzed water storage tank) 6 is also increased.
And the permeated water with a high dissolved hydrogen concentration is obtained by processing the water of the pre-treatment water tank (electrolyzed water storage tank) 6 with the RO device 3 and stored in the permeated water tank 5.
Further, in the apparatus shown in Patent Document 1 (FIG. 4), when the electrolyzed water production apparatus fails, there is a concern that the production of purified water for artificial dialysis cannot be performed, which may hinder dialysis treatment. In the purified water production apparatus shown in FIG. 1, when the electrolyzed water production apparatus 4 fails, the cathodic water production can be stopped and the RO apparatus 3 can produce RO purified water, which is serious in dialysis treatment. It will not cause any trouble.

By repeating the above operation, when the dissolved hydrogen concentration in the permeate tank 5 is increased to a certain level (preferably about 200 to 500 ppb), water can be collected and used as purified water (water for artificial dialysis, etc.). .
Artificial dialysate obtained by mixing purified water with high dissolved hydrogen concentration (water for artificial dialysis) and necessary components has high antioxidant action and exhibits antioxidant action (reducing action) against reactive oxygen species. Thus, it is expected to have a positive effect on the artificial dialysis patient.

The manufacturing apparatus shown in FIG. 1 can be appropriately washed with clean water, and the RO apparatus 3 can be sterilized and washed with a bactericide such as an aqueous solution of peracetic acid.
Furthermore, the RO device 3, the permeate water tank 5, the pretreatment water tank (electrolyzed water storage tank) 6, and each line can be heat sterilized or chemical sterilized.

(2) Apparatus for producing purified water for medical use in FIG. 2 In the apparatus for producing purified water shown in FIG. 2, the same reference numerals as those for the apparatus for producing purified water in FIG. 1 are the same. In addition, a prefilter can be installed in front of the water softener 1 as necessary, as in the apparatus of FIG. Moreover, both or one of the water softener 1 and the adsorption device 2 can be omitted, and when both are omitted, the source water line 11 can be connected to the RO device 3.

A raw water line 21 is connected to a source of raw water (tap water or groundwater). As in the apparatus of FIG. 1, a raw water tank may be provided before connection from the raw water supply source to the raw water line 21.
The raw water is sent to the water softener 1 by driving a raw water pump 71 installed in the raw water line 21.
The water whose hardness component concentration is reduced in the water softener 1 is sent from the line 22 to the adsorption device 2.
The water from which impurities and the like have been removed by the adsorption device 2 is sent to the RO device 3 from the line 23 by driving the pump 72 and is filtered.

The permeated water obtained by the RO device 3 is sent from the line 24 to the permeated water tank 5 and stored therein.
The permeated water (RO water) in the permeated water tank 5 is collected from the line 25 and used as purified medical water such as artificial dialysate water.
The concentrated water obtained by the RO device 3 is sent from the line 26 to the electrolyzed water production device 4 for processing.

The electrolyzed cathode water having a high dissolved hydrogen concentration obtained by the electrolyzed water production apparatus 4 is sent from the line 28 to the electrolyzed water storage tank 6 and stored therein.
Line 29 is an overflow line. By providing the overflow line, the flow rate of the water discharged in the apparatus shown in FIG. 2 is the total amount of the electrolytic acid water of the electrolyzed water production apparatus 4 and the overflow water discharged in the overflow.
Here, since the amount of the electrolytic acid water is fixed at a predetermined operating condition of the electrolyzed water production apparatus 4, the recovery rate of water used as purified water in the purified water production apparatus of FIG. It can be increased or decreased by adjusting the amount of water.
Moreover, when the overflow line is not provided in the electrolyzed water storage tank 6, the water level fluctuates in accordance with the operation and stop of the RO device 3. However, when an overflow line is provided, the water level of the electrolyzed water storage tank 6 can be kept constant by always overflowing during operation of the electrolyzed water production apparatus 4. The electrolyzed water storage tank 6 can be downsized as compared with the case where overflow is not performed.
The electrolytic anodized water obtained by the electrolyzed water production apparatus 4 is drained from the line 27.

The electrolyzed cathodic water having a high dissolved hydrogen concentration in the electrolyzed water storage tank 6 is sent to the ultrafiltration membrane device 7 from the line 30 by driving the pump 73 for filtration. In addition, in the apparatus of FIG. 2, the ultrafiltration membrane apparatus 7 is not indispensable, and can be installed as needed.
The water filtered by the ultrafiltration membrane device 7 is water that has been purified by removing microorganisms and has a high dissolved hydrogen concentration, and is sent from the line 31 to the RO device 3 via the line 23.
Since there is no chlorine inside the electrolyzed water storage tank 6, microorganisms are likely to grow. However, by installing the ultrafiltration membrane device 7, microbial contamination is caused by the ultrafiltration device 7 in the line from the line 30 to the line 31. Can be removed.

In addition, 111, 112, 113 in FIG. 2 has shown the opening / closing valve which consists of solenoid valves etc., and opens / closes each line by opening / closing suitably according to the driving | running state of the manufacturing apparatus of medical purified water. It is.
In each line in FIG. 2, an on-off valve can be appropriately installed as necessary.

Next, an embodiment of a preferable operation method of the purified water production apparatus shown in FIG. 2 will be described.
When the operation is started, the raw water is processed in the order of the water softener 1, the adsorption device 2, and the RO device 3, and the permeated water (RO water) is stored in the permeated water tank 5.
At this time, the permeated water stored in the permeated water tank 5 can be collected as it is and used as artificial dialysis water or the like, but the dissolved hydrogen concentration in the permeated water is not yet high at this stage.
For this reason, it is desirable that the permeated water first stored in the permeated water tank 5 from the start of operation is not immediately collected, and the operation is further continued.

Electrolyzed cathodic water having a high dissolved hydrogen concentration is obtained by electrolyzing the concentrated water produced in the RO device 3 with the electrolyzed water production device 4.
The electrolytic cathodic water having a high dissolved hydrogen concentration is sent from the line 28 to the electrolytic water storage tank 6 and stored therein.
In the apparatus of FIG. 1, the dissolved hydrogen concentration in the stored water in the electrolyzed water storage tank 6 is kept constant by matching the driving and stopping of the raw water pump 61 with the driving and stopping of the RO pressurization pump 62. There is a need.
In the apparatus of FIG. 2, by providing an overflow line 29 in the electrolyzed water storage tank 6, the electrolyzed water tank 6 is always overflowed during operation of the electrolyzed water production apparatus 4 to keep the water level constant. In order to always overflow, the electrolytic cathode water inflow amount to the electrolytic water storage tank 6 is adjusted to be larger than the outflow amount from the electrolytic water storage tank passing through the line 30.
Since the water level in the electrolyzed water storage tank 6 is always kept constant due to overflow, the dissolved hydrogen concentration in the electrolyzed water storage tank 6 can be kept constant, which is higher than that of the apparatus of FIG. Management of dissolved hydrogen concentration becomes easy.
When the overflow line 29 is not provided, the water level in the electrolyzed water storage tank 6 is lowered or raised as the RO pressurization pump 62 is driven and stopped. When the water level in the electrolyzed water storage tank 6 falls, the electrolyzed cathode water falls and flows into the liquid surface in the electrolyzed water storage tank 6 so that the dissolved hydrogen in the electrolyzed water is dissipated into the atmosphere and the hydrogen concentration May decrease.
In the apparatus of FIG. 2, an overflow line 29 is provided in the vicinity of the highest part of the electrolyzed water storage tank 6, and an electrolytic cathode water inlet is disposed below the surface of the electrolyzed water storage tank 6, thereby dissipating the dissolved hydrogen. There is also an advantage that the hydrogen concentration in the electrolyzed water in the electrolyzed water storage tank 6 can be kept high.
And the permeated water with a high dissolved hydrogen density | concentration is obtained by processing the water of the electrolyzed water storage tank 6 with the RO apparatus 3, and it stores in the permeated water tank 5. FIG.

By repeating the above operation, when the dissolved hydrogen concentration in the permeate tank 5 is increased to a certain level (preferably about 200 to 500 ppb), water can be collected and used as purified water (water for artificial dialysis, etc.). .
Artificial dialysate obtained by mixing purified water with high dissolved hydrogen concentration (water for artificial dialysis) and necessary components has high antioxidant action and exhibits antioxidant action (reducing action) against reactive oxygen species. Thus, it is expected to have a positive effect on the artificial dialysis patient.

(3) Purified water production apparatus in FIG. 3 In the purified water production apparatus shown in FIG. 3, the same reference numerals as those in the purified water production apparatus in FIGS. 1 and 2 indicate the same thing. In addition, a prefilter can be installed in front of the water softener 1 as necessary, as in the apparatus of FIG. Further, both or one of the water softener 1 and the adsorption device 2 can be omitted, and when both are omitted, the source water line 11 can be connected to the RO device 3.

A raw water line 41 is connected to a source of raw water (tap water or groundwater). Similarly to the apparatus of FIG. 1, a raw water tank may be provided before connection from the raw water supply source to the raw water line 41.
The raw water is sent to the water softener 1 by driving a raw water pump 81 installed in the raw water line 41.
The water in which the concentration of the hardness component is reduced in the water softener 1 is sent from the line 42 to the adsorption device 2.
The water from which impurities and the like have been removed by the adsorption device 2 is sent to the RO device 3 from the line 43 by driving the pump 82 and filtered.

The permeated water obtained by the RO device 3 is sent from the line 44 to the permeated water tank 5 and stored therein.
The permeated water (RO water) in the permeated water tank 5 is collected from the line 45 and used as medical purified water such as artificial dialysate water.
The concentrated water obtained by the RO device 3 is sent from the lines 46 and 48 to the electrolyzed water production device 4 for processing.
A part (excess amount) of the concentrated water obtained by the RO device 3 is drained from the line 47. By partially discharging concentrated water from the line 47, the amount of concentrated water sent to the electrolyzed water production apparatus 4 is adjusted.

The electrolyzed cathodic water having a high dissolved hydrogen concentration obtained by the electrolyzed water production apparatus 4 is sent from the line 50 to the electrolyzed water storage tank 6 and stored therein.
The line 52 is an overflow line, and the water recovery rate in the purified water production apparatus of FIG. 3 is set by adjusting the amount of electrolytic cathode water, the amount of overflow water, and the amount of partial drainage of concentrated water from the RO device 3.
Moreover, when the overflow line is not provided in the electrolyzed water storage tank 6, the water level fluctuates in accordance with the operation and stop of the RO device 3. It is necessary to provide a margin for
In the case where the overflow line is provided, during the operation of the electrolyzed water production apparatus 4, it is possible to always overflow and keep the water level of the electrolyzed water storage tank 6 constant. The water storage tank 6 can be downsized.
The electrolytic anodized water obtained by the electrolyzed water production apparatus 4 is drained from the line 49.

Cathode water (electrolyte catholyte) having a high dissolved hydrogen ion concentration in the electrolyzed water storage tank 6 is sent from the line 51 to the ultrafiltration membrane device 7 by the pump 83 to be filtered. In addition, in the apparatus of FIG. 3, the ultrafiltration membrane apparatus 7 is not indispensable, and can be installed as needed.
The water filtered by the ultrafiltration membrane device 7 is water that has been cleaned by removing microorganisms and has a high dissolved hydrogen concentration, and is sent from the line 54 to the RO device 3 via the line 43.
Since chlorine does not exist inside the electrolyzed water storage tank, microorganisms are likely to grow. However, by installing the ultrafiltration membrane device 7, microbial contamination of the line from the line 54 to the line 43 can be prevented. The electrolyzed water storage tank 6 can be provided with a UV germicidal lamp.

In the apparatus of FIG. 3, a return line 53 to the electrolyzed water storage tank 6 is provided from the middle of the line 51. The pump 83 is driven, and the amount of electrolytic cathode water flowing through the ultrafiltration membrane device 7 and the line 43 can be adjusted by the return line 53.
In addition, 121, 122, 123 in FIG. 3 has shown the opening / closing valve which consists of solenoid valves etc., and opens / closes each line by opening / closing suitably according to the driving | running state of the manufacturing apparatus of purified water. .
“FI” in FIG. 3 is a flow meter.
In each line in FIG. 3, an on-off valve can be appropriately installed as necessary, and the flow rate flowing through each line is adjusted by a flow meter together with the on-off valve.

Next, an embodiment of a preferred operation method of the purified water production apparatus shown in FIG. 3 will be described.
When the operation is started, the raw water is processed in the order of the water softener 1, the adsorption device 2, and the RO device 3, and the permeated water (RO water) is stored in the permeated water tank 5.
At this time, the permeated water stored in the permeated water tank 5 can be collected as it is and used as artificial dialysis water or the like, but the dissolved hydrogen concentration in the permeated water is not yet high at this stage.
For this reason, it is desirable that the permeated water first stored in the permeated water tank 5 from the start of operation is not immediately collected, and the operation is further continued.

Electrolyzed cathodic water having a high dissolved hydrogen concentration is obtained by electrolyzing the concentrated water produced in the RO device 3 with the electrolyzed water production device 4.
The electrolytic cathodic water having a high dissolved hydrogen concentration is sent from the line 50 to the electrolytic water storage tank 6 and stored therein.
In the apparatus of FIG. 1, the concentration of dissolved hydrogen in the stored water in the electrolytic water storage tank 6 is kept constant by matching the driving and stopping of the raw water pump 61 and the driving and stopping of the RO pressurization pump 62. There is a need.
In the apparatus of FIG. 3, by providing the overflow line 52 in the electrolyzed water storage tank 6, the electrolyzed water tank 6 is always overflowed during operation of the electrolyzed water production apparatus 4 to keep the water level constant. In order to always overflow, the electrolytic cathode water inflow amount to the electrolytic water storage tank 6 is adjusted to be larger than the outflow amount from the electrolytic water storage tank passing through the line 51. Since the water level in the electrolyzed water storage tank 6 is always kept constant by overflow, the dissolved hydrogen concentration in the electrolyzed water storage tank 6 can be kept constant, and the dissolved hydrogen concentration can be controlled. It becomes easy.

In the apparatus of FIG.
(I) An overflow line 52 is provided in the electrolyzed water storage tank 6 and the amount of electrolyzed cathode water passing through the line 51 is adjusted to adjust the amount of overflow water. The amount of electrolyzed cathode water sent to the line 43 and the amount of raw water passing through the line 43 Adjusting the ratio with
(II) draining part of the concentrated water obtained by the RO device 3 from the line 47 and adjusting the amount of concentrated water sent to the electrolyzed water production device 4;
(III) Adjusting the amount of electrolytic cathode water flowing through the ultrafiltration membrane device 7 and the line 43 by providing a return line 53 to the electrolytic water storage tank 6 from the middle of the line 51;
Thus, the utilization efficiency (recovery efficiency) of raw water in the purified water production apparatus can be adjusted appropriately.

In the apparatus of FIGS. 1 and 4, the water level in the electrolyzed water storage tank 6 is lowered or raised as the RO pressurization pump 82 is driven and stopped. When the water level in the electrolyzed water storage tank 6 drops, the electrolyzed water falls and flows into the liquid surface in the electrolyzed water storage tank 6, so that dissolved hydrogen in the electrolyzed cathode water is dissipated into the atmosphere and the hydrogen concentration May decrease.
In the apparatus of FIG. 3, the overflow line 52 is provided near the highest portion of the electrolyzed water storage tank 6, and the electrolytic cathode water inlet is disposed below the surface of the electrolyzed water storage tank 6, thereby dissipating the dissolved hydrogen. And the hydrogen concentration in the electrolyzed water in the electrolyzed water storage tank 6 can be maintained at a high concentration.
Then, the permeated water having a high dissolved hydrogen concentration is obtained by treating the water in the electrolyzed water storage tank 6 with the RO device 3 and stored in the permeated water tank 5.

By repeating the above operation, when the dissolved hydrogen concentration in the permeate tank 5 is increased to a certain level (preferably about 200 to 500 ppb), water can be collected and used as purified water (water for artificial dialysis, etc.). .
Artificial dialysate obtained by mixing purified water with high dissolved hydrogen concentration (water for artificial dialysis) and necessary components has high antioxidant action and exhibits antioxidant action (reducing action) against reactive oxygen species. Thus, it is expected to have a positive effect on the artificial dialysis patient.

Examples 1-3, Comparative Example 1
Example 1 was operated with the apparatus (treatment flow) shown in FIG. 1 under the operating conditions shown in Table 1 to obtain RO water (permeated water). There is only one electrolyzed water production apparatus.
Example 2 was operated with the apparatus (treatment flow) shown in FIG. 2 under the operating conditions shown in Table 1 to obtain RO water (permeated water). There is only one electrolyzed water production apparatus.
Example 3 was operated by the apparatus (processing flow) shown in FIG. 2 under the operating conditions shown in Table 1 to obtain RO water (permeated water). There is only one electrolyzed water production apparatus.
In Comparative Example 1, RO water (permeated water) was obtained using the apparatus (processing flow) shown in FIG. 4 under the operating conditions shown in Table 1. Two electrolyzed water production apparatuses were used. The results are shown in Table 1.

The details of the apparatus used in FIGS. 1, 2, and 4 are as follows.
Prefilter: 10μm × 500ml × 1 Water softener: ATS-18 from Autotrol
Activated carbon (adsorption device): Fibrous activated carbon RO device:
Examples 1 and 2 and Comparative Example 1: VCR-42S from Daisen Membrane Systems Co., Ltd. (4 inch spiral module x 2; 99% salt removal rate)
Example 3: SV08-GP-DRA981F from Daisen Membrane Systems Co., Ltd. (one 8-inch spiral module, 99% salt removal rate; RO device used in Examples 1, 2 and Comparative Example 1) 4 times the capacity of fresh water)
Electrolyzed water production equipment: Trimmed Medical Institute's electrodialysis water conditioner (trade name TRIM HD-24D)
Ultrafiltration membrane device: FS10-FUST653
Measurement of dissolved hydrogen concentration: Portable dissolved hydrogen meter DH-35A from Toa DK Corporation

In Example 1 (apparatus of FIG. 1), Example 2 (apparatus of FIG. 2), and Example 3 (apparatus of FIG. 2), after the concentrated water discharged from the RO apparatus was treated with the electrolyzed water production apparatus, Permeated water (RO water) treated with the RO device was used as artificial dialysis water (purified water).
On the other hand, in Comparative Example 1 (apparatus in FIG. 4), permeated water (RO water) obtained by treating the cathode water obtained by the electrolytic production apparatus with the RO apparatus was used as artificial dialysis water (purified water).
As a result, in Example 1 in which RO concentrated water was used, the dissolved hydrogen concentration in RO water could be increased as compared with Comparative Example 1.
In Examples 2 and 3, the conductivity of raw water is lower than that of Comparative Example 1, and the dissolved hydrogen concentration in RO water is compared even though electrolysis was performed using only one electrolyzed water production apparatus. It was possible to generate at a level almost the same as in Example 1.
Further, Examples 1 to 3 using RO concentrated water can reduce the amount of raw water used by about 30%, and two electrolyzed water production apparatuses were required in the comparative example. 1 to 3 could be carried out with one unit. By reducing the amount of raw water used, the number of necessary electrolyzed water production equipment, and the size of the electrolyzed water tank, it became possible to reduce the size of the production equipment for purified water (water for artificial dialysis) and save space.
Moreover, in Example 2 and Example 3, since the UF membrane filtration process was performed after the electrolyzed water tank, microbial contamination did not occur.

DESCRIPTION OF SYMBOLS 1 Water softener 2 Adsorber 3 RO apparatus 4 Electrolyzed water production apparatus 5 Permeated water tank (RO water tank)
6 Pretreatment water tank (electrolyzed water storage tank)
7 Ultrafiltration membrane device

Claims (9)

An apparatus for producing purified water having an electrolyzed water production device (4), an electrolyzed water storage tank (6), and a reverse osmosis membrane device (RO device) (3),
It is connected so that raw water is supplied to the RO device (3),
The concentrated water line of the RO device (3) is connected to the electrolyzed water production device (4).
The electrolyzed cathode water line of the electrolyzed water production device (4) is connected to the electrolyzed water storage tank (6),
An apparatus for producing purified water, in which an electrolyzed water storage tank (6) is connected to an RO device (3). Water softener (1), adsorption device (2), electrolyzed water production device (4), electrolyzed water storage tank (6), reverse osmosis membrane device (RO device) (3) and RO device treated water (permeate) tank ( 5) A purified water production apparatus having
Water softener (1), adsorption device (2), electrolyzed water storage tank (6), and RO device (3) are connected in this order,
The permeate line (15) of the RO device (3) is connected to the permeate tank (5),
The concentrated water line (17) of the RO device (3) is connected to the electrolyzed water production device (4),
An apparatus for producing purified water, wherein the electrolyzed cathode water line (19) of the electrolyzed water production apparatus (4) is connected to the electrolyzed water storage tank (6).   Furthermore, the purified water manufacturing apparatus of Claim 2 with which the ultrafiltration membrane apparatus is installed between the electrolyzed water storage tank and RO apparatus. Water softener (1), adsorption device (2), electrolyzed water production device (4), electrolyzed water storage tank (6), reverse osmosis membrane device (RO device) (3) and RO device treated water (permeate) tank ( 5) A purified water production apparatus having
Water softener (1), adsorption device (2) and RO device (3) are connected in this order,
The permeate line (24) of the RO device (3) is connected to the permeate tank (5),
The concentrated water line (26) of the RO device (3) is connected to the electrolyzed water production device (4),
The electrolyzed cathode water line (28) of the electrolyzed water production device (4) is connected to the electrolyzed water storage tank (6),
An apparatus for producing purified water, wherein the electrolyzed water storage tank (6) is connected to a line (23) between the adsorption device (2) and the RO device (3).   The apparatus for producing purified water according to claim 4, further comprising an ultrafiltration membrane device (7) installed between the storage tank (6) for electrolytic water and the line (23). The electrolyzed water storage tank (6) has an overflow line (29),
The overflow line (29) keeps the water level constant by overflowing an excessive amount of water flowing into the electrolyzed water storage tank (6) during operation of the electrolyzed water production device (4). Or the manufacturing apparatus of the purified water of 5. Water softener (1), adsorption device (2), electrolyzed water production device (4), electrolyzed water storage tank (6), reverse osmosis membrane device (RO device) (3) and RO device treated water (permeate) tank ( 5) A purified water production apparatus having
Water softener (1), adsorption device (3) and RO device (3) are connected in this order,
The permeate line (44) of the RO device (3) is connected to the permeate tank (5),
The concentrated water line (46) of the RO device (3) is connected to both the electrolyzed water production device (4) and the discharge line (47),
The electrolyzed cathode water line (50) of the electrolyzed water production device (4) is connected to the electrolyzed water storage tank (6),
The electrolyzed water storage tank (6) is connected to the line (43) between the adsorption device (2) and the RO device (3),
Furthermore, the return line (53) from the cathode water line (51) between the electrolyzed water storage tank (6) and the line (43) between the adsorption device (2) and the RO device (3) to the electrolyzed water storage tank (6). ), A device for producing purified water.   The apparatus for producing purified water according to claim 7, further comprising an ultrafiltration membrane device (7) installed between the electrolyzed water storage tank (6) and the line (43). The electrolyzed water storage tank (6) has an overflow line (52),
The overflow line (52) keeps the water level constant by overflowing an excessive amount of water flowing into the electrolyzed water storage tank (6) during operation of the electrolyzed water production device (4). Or the manufacturing apparatus of the purified water of 8.

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