JP6802059B2 - Purified water supply system and its operation method - Google Patents

Description

The present invention relates to a purified water supply system and a method of operating the same.

For dialysis treatment, a dialysis machine is used in which a dialysate is prepared from purified water and a dialysis base material, and dialysis is performed using the dialysate.
The purified water supply system that supplies purified water to the dialysis equipment includes a purified water production equipment that produces purified water, a purified water external circulation line that circulates the purified water produced by the purified water production equipment in a hospital, etc. There is known one provided with a purified water distribution line that branches from the middle of the purified water external circulation line and distributes purified water to a personal dialysis machine arranged for each hospital room or bed (for example, Patent Document 1). ).

In dialysis treatment, it is required that the dialysate is not contaminated by bacteria or endotoxin. Therefore, dialysis machines and purified water supply systems are frequently disinfected. For example, in the purified water supply system described in Patent Document 1, a disinfectant chemical solution obtained by adding sodium hypochlorite to purified water is passed through a purified water production apparatus and an external circulation line of purified water. There is.

Japanese Unexamined Patent Publication No. 2005-0344433

However, when a chemical solution is used to disinfect the purified water supply system, the following problems occur.
-After disinfecting the purified water supply system, the chemical solution remains in the purified water supply system.
-It is necessary to perform sufficient rinsing in order to minimize the residual chemical solution, and it takes time to restart the supply of purified water. Especially in the case of emergency use, it is expected that there will be a rush to restart.
-All purified water used for preparation and rinsing of chemicals must be discarded and cannot be reused.

The present invention is a purified water supply system capable of distributing and supplying purified water produced by a purified water production apparatus, and when the purified water supply system is disinfected, there is no residual chemical solution and the purified water can be supplied in a short time. Provided is a purified water supply system capable of resuming supply and reusing purified water used for disinfection and a method of operating the system.

The present invention has the following aspects.
<1> A purified water production apparatus for producing purified water; a purified water circulation line for circulating the purified water produced by the purified water production apparatus to the outside of the purified water production apparatus; a branch from the middle of the purified water circulation line. The purified water production apparatus is provided with a heating means for heating the purified water; the purified water circulation line or the purified water distribution line is provided with a flow sensor for purified water. Supply system.
<2> The purified water supply system according to <1>, wherein a temperature sensor is provided in the purified water circulation line.
< 3 > The purified water supply system according to <1> or <2> , further comprising a control means for driving the heating means and controlling the opening and closing of the purified water distribution line.
< 4 > The method of operating the purified water supply system of <1 > ; while operating the purified water supply system, the purified water produced by the purified water production apparatus is constantly circulated in the purified water circulation line. When the purified water circulation line and the purified water distribution line are disinfected with hot water, the purified water is heated by the heating means ; the purified water is supplied based on the flow information of the purified water sent from the flow sensor. A method of operating a purified water supply system that determines whether or not purified water is distributed and supplied to a target .
<5> A method of operating the purified water supply system of <2>; while operating the purified water supply system, the purified water produced by the purified water production apparatus is constantly circulated to the purified water circulation line. When the purified water circulation line and the purified water distribution line are disinfected with hot water, the purified water is heated by the heating means; the purified water is purified water based on the flow information of the purified water sent from the flow sensor. Purified water supply that determines whether or not the purified water is distributed to the supply target; determines whether or not the purified water circulation line is undergoing hot water disinfection based on the temperature information of the purified water sent from the temperature sensor. How to operate the system.

The purified water supply system of the present invention can distribute and supply purified water produced by the purified water production apparatus, and when the purified water supply system is disinfected, there is no residual chemical solution and the purified water is supplied in a short time. The purified water used for disinfection can be reused.
According to the operation method of the purified water supply system of the present invention, the purified water produced by the purified water production apparatus can be distributed and supplied, and when the purified water supply system is disinfected, there is no residual chemical solution and the time is short. The supply of purified water can be resumed at, and the purified water used for disinfection can be reused.

It is a schematic block diagram which shows an example of the purified water supply system of this invention. It is a schematic block diagram which shows an example of the purified water production apparatus. FIG. 5 is a schematic configuration diagram showing a state in which a personal dialysis machine is connected to the purified water supply system of FIG.

<Purified water supply system>
FIG. 1 is a schematic configuration diagram showing an example of the purified water supply system of the present invention.
The purified water supply system 1 includes a purified water production apparatus 10 for producing purified water; and a purified water external circulation line 100 (purified water circulation) for circulating the purified water produced by the purified water production apparatus 10 to the outside of the purified water production apparatus 10. Line) and; a plurality of purified water distribution lines 102 for distributing and supplying purified water to the purified water supply target by branching from the middle of the purified water external circulation line 100; provided separately from the purified water external circulation line 100. Main drainage line 104 (drainage line) for discharging the wastewater generated in the purified water supply system 1 to the outside; purified water from the purified water distribution line 102 and drainage from the purified water supply target to the main drainage line 104. The first drainage introduction line 106 (drainage line) and the second drainage introduction line 108 (drainage), which are branched from the main drainage line 104 for each purified water distribution line 102 and the purified water supply target so that they can be introduced. Line) and; the first end is detachably connected to the end of the purified water distribution line 102, the second end is detachably connected to the end of the first drainage introduction line 106, and the purified water distribution line. It is provided with a bypass line 110 that directly feeds the purified water that has passed through 102 to the main drainage line 104 via the first drainage introduction line 106 without passing through the purified water supply target.

The purified water supply system 1 is further provided in the middle of the purified water distribution line 102 to open and close the purified water distribution line 102; and is provided in the middle of the first drainage introduction line 106. It is provided with a solenoid valve 116 that opens and closes the drainage introduction line 106.

The purified water supply system 1 is further electrically connected to the purified water production apparatus 10 and electrically connected to the solenoid valve 112 and the solenoid valve 116 via the relay board 120 to be electrically connected to the purified water production apparatus 10 and each of them. A control device 80 (control means) for controlling the solenoid valve is provided.

The purified water supply system 1 further includes an ultrafiltration membrane filter 90 provided in the middle of the purified water external circulation line 100 before the purified water is returned to the purified water production apparatus 10. The ultrafiltration membrane filter 90 is provided for removing bacteria and endotoxin in the purified water external circulation line 100.

(Purified water production equipment)
FIG. 2 is a schematic configuration diagram showing an example of a purified water production apparatus.
The purified water production apparatus 10 includes a raw water tank 12 for storing raw water supplied from a tap or the like; and an activated charcoal filter 14 containing active charcoal for removing residual chlorine in the raw water sent from the raw water tank 12; A check filter 16 for removing dust and fine powder of activated charcoal; a nanofiltration membrane module 18 containing a nanofiltration membrane element for softening raw water; and a back-penetration membrane for filtering the softened raw water to obtain purified water. The back-penetration membrane module 20; the purified water tank 22 for storing purified water; the ultraviolet lamp 24 for sterilizing the purified water in the purified water tank 22; and the heater 26 for heating the purified water in the purified water tank 22 (heating means). ) And; a temperature sensor (not shown) for measuring the temperature of purified water in the purified water tank 22 is provided.

The purified water production apparatus 10 further includes a raw water supply line 30 in which the first end is connected to the raw water tank 12 and the second end is connected to the activated charcoal filter 14; the first end is the activated charcoal filter. With the first raw water transfer line 32 connected to 14 and the second end connected to the check filter 16; the first end connected to the check filter 16 and the second end connected to the nanofiltration membrane module 18 With a second raw water transfer line 34 connected to; a soft water transfer line 36 with a first end connected to the nanofiltration membrane module 18 and a second end connected to the reverse osmosis membrane module 20; With a purified water transfer line 38 with an end connected to the reverse osmosis membrane module 20 and a second end connected to the purified water tank 22; a first end connected to the purified water tank 22 and a second end. A purified water internal circulation line 40 whose unit is connected to a soft water transfer line 36 on the downstream side of the pressurizing pump 74; and a drainage line 42 for an apparatus for discharging the wastewater generated in the purified water production apparatus 10 to the outside; With the first concentrated water discharge line 44, where the first end is connected to the nanofiltration membrane module 18 and the second end is connected to the equipment drain line 42; the first end is the reverse osmosis membrane module 20. It is provided with a second concentrated water discharge line 46 which is connected to and has a second end connected to the device drain line 42.
The purified water production apparatus 10 further includes a part of the above-mentioned purified water external circulation line 100 in which the first end and the second end are connected to the purified water tank 22.

The purified water production apparatus 10 is further provided in the middle of the soft water transfer line 36 with an electromagnetic valve 52 for opening and closing the soft water transfer line 36; and is provided in the middle of the first concentrated water discharge line 44 for the first concentration. An electromagnetic valve 56 that opens and closes the water discharge line 44; an electromagnetic valve 58 that is provided in the middle of the second concentrated water discharge line 46 and opens and closes the second concentrated water discharge line 46; an electromagnetic wave of the soft water transfer line 36. A check valve 60 provided in the middle of the upstream side of the valve 52; a check valve 62 provided in the middle of the purified water transfer line 38; a check valve provided in the middle of the purified water internal circulation line 40. 64 and.

The purified water production apparatus 10 further includes a raw water pump 70 provided in the middle of the raw water supply line 30; a pressurizing pump 72 provided in the middle of the second raw water transfer line 34; and an electromagnetic valve of the soft water transfer line 36. A pressurizing pump 74 provided in the middle of the downstream side of 52; an internal circulation pump 76 provided in the middle of the check valve 64 of the purified water internal circulation line 40; and a purified water external circulation line 100. It is provided with an external circulation pump 78 provided in the middle of the above.
A control device 80 for controlling these is electrically connected to the ultraviolet lamp 24, the heater 26, the temperature sensor, each solenoid valve, each pump, and the like.

As the reverse osmosis membrane module 20, a reverse osmosis membrane module usually used in a purified water production apparatus may be used, and is not particularly limited. Examples of the reverse osmosis membrane module include the spiral type reverse osmosis membrane module described in Japanese Patent No. 4990710. The spiral type reverse osmosis membrane module is a cylindrical reverse osmosis membrane element in which a reverse osmosis membrane is wound around a water collecting pipe, which is housed in a cylindrical casing. The raw water introduced from the raw water inlet is reverse osmotic. It separates purified water that has permeated the membrane and concentrated water that does not permeate the reverse osmosis membrane. As the reverse osmosis membrane, a reverse osmosis membrane usually used in purified water production equipment may be used, and is not particularly limited. Examples of the material of the reverse osmosis membrane include polyamide, polysulfone, cellulose acetate, polyacrylonitrile and the like.

As the nanofiltration membrane module 18, a nanofiltration membrane module usually used in a purified water production apparatus may be used, and is not particularly limited. Examples of the nanofiltration membrane module include a spiral type nanofiltration membrane module having the same structure as the spiral type reverse osmosis membrane module. The spiral type nanofiltration membrane module is a cylindrical nanofiltration membrane element in which a nanofiltration membrane is wound around a water collection pipe and is housed in a cylindrical casing. The raw water introduced from the raw water inlet is nanofiltered. It separates into soft water that has permeated the membrane and concentrated water that does not permeate the nanofiltration membrane.

The nanofiltration membrane (NF membrane) is a membrane having an intermediate pore diameter between the ultrafiltration membrane (UF membrane) and the reverse osmosis membrane (RO membrane) and having a charge on the surface of the membrane material. According to the definition of IUPAC {"Membrane and Membrane Process Terminology (1996 IUPAC recommended)" described in the Journal of Polymer Science, 120, 149-159 (1996)}, a nanofiltration membrane is "particles smaller than 2 nm. It is said to be a pressure-driven membrane separation process in which macromolecules are blocked. By the way, the microfiltration membrane (MF membrane) is larger than 0.1 μm, and the ultrafiltration membrane (UF membrane) is a membrane that can block those in the range of 0.1 μm to 2 nm. That is, the nanofiltration membrane combines the separation by pores (size separation) and the separation effect due to the electric interaction between the charge on the membrane surface and the ionic component in the solute, and the membrane's unique blocking performance and permeation performance. Is shown.

As the nanofiltration membrane, one using polyamide as a material (hereinafter, also referred to as a polyamide-based nanofiltration membrane) is preferable. Since polyamide-based nanofiltration membranes have a negative fixed charge on the surface of the membrane material, divalent or higher cations, especially calcium ions, are compared to ordinary nanofiltration membranes such as cellulose acetate, polysulfone, and polyacrylonitrile. It has a high ability to remove hardness components such as magnesium ions, and is ideal for softening raw water. In addition, the polyamide-based nanofiltration membrane has less retention of raw water than the ion exchange resin, so that bacteria are less likely to grow. Further, since the polyamide-based nanofiltration membrane can block particles and polymers having a size smaller than 2 nm, endotoxin can be removed. In addition, the polyamide-based nanofiltration membrane has a higher flow rate, a wider pH range and temperature range that can be used, a higher ability to remove endotoxin, and higher chemical resistance than the cellulose acetate-based membrane that is a normal nanofiltration membrane.

The high-pressure pump used for each pump may be any pump that is normally used in purified water production equipment, and is not particularly limited. Examples of the high-pressure pump include a multi-stage centrifugal pump and a plunger pump.

(Purified water circulation line)
The purified water external circulation line 100 requires purified water produced by the purified water production apparatus 10 in facilities such as medical facilities (hospitals, etc.) and factories (pharmaceutical factories, food factories, semiconductor equipment factories, etc.). It is a line for sending purified water to the vicinity of equipment, equipment, etc.
The purified water external circulation line 100 is arranged inside or outside a structure such as a ceiling, floor, wall, or counter of a facility.

In the purified water external circulation line 100, flow rate information (electrical signal) of purified water flowing through the purified water external circulation line 100 for determining whether or not the purified water is distributed and supplied to the purified water supply target in the processing unit of the control device 80. ) Is provided with a flow sensor or flow switch.
Further, the purified water external circulation line 100 contains temperature information of purified water flowing through the purified water external circulation line 100 for determining whether or not the purified water external circulation line 100 is being disinfected with hot water in the processing unit of the control device 80. A temperature sensor for acquiring (electrical signal) may be provided.

(Purified water distribution line)
The purified water distribution line 102 is a line that branches from the middle of the purified water external circulation line 100 and distributes and supplies purified water to the purified water supply target. When it is not necessary to distribute and supply purified water to the purified water supply target, the first end of the bypass line 110, which will be described later, is detachably connected to the end of the purified water distribution line 102.

The purified water distribution line 102 is arranged inside or outside a structure such as a ceiling, a floor, a wall, or a counter of a facility, and at least its end is projected outside the structure.
At the end of the purified water distribution line 102, a connector is provided for detachably connecting a water pipe of the purified water supply target, a bypass line 110 described later, and the like.
On the upstream side of the electromagnetic valve 112 of the purified water distribution line 102, purified water flows through the purified water distribution line 102 for determining whether or not the purified water is distributed and supplied to the purified water supply target in the processing unit of the control device 80. A flow sensor 122 for acquiring the flow information (electrical signal) of the above is provided.

Examples of the target of purified water supply include facilities and devices that require purified water in facilities such as medical facilities (hospitals, etc.) and factories (pharmaceutical factories, food factories, semiconductor equipment factories, etc.). Examples of equipment and devices that require purified water in medical facilities include personal dialysis machines and the like that are arranged in each hospital room or bed.

(Drainage line)
The main drainage line 104, the first drainage introduction line 106, and the second drainage introduction line 108 are drainage lines for discharging the wastewater generated in the purified water supply system 1 to the outside.
A second end of the bypass line 110, which will be described later, is detachably connected to the end of the first drainage introduction line 106. The end of the drainage pipe of the purified water supply target is detachably connected to the end of the second drainage introduction line 108. When it is not necessary to distribute and supply purified water to the purified water supply target, the end of the drain pipe of the purified water supply target may not be connected to the end of the second drainage introduction line 108.

The main drainage line 104, the first drainage introduction line 106, and the second drainage introduction line 108 are arranged inside or outside the structure such as the ceiling, floor, wall, and counter of the facility, and at least the first drainage introduction. The end of the line 106 and the end of the second drainage introduction line 108 project outside the structure.
At the end of the first drainage introduction line 106 and the end of the second drainage introduction line 108, connectors for detachably connecting the drainage pipe of the purified water supply target, the bypass line 110 described later, and the like are provided. There is.

The wastewater generated in the purified water supply system 1 is the wastewater that is no longer needed because it is used in the purified water supply target; the purified water stays in the purified water distribution line 102 and is contaminated; the outside of the purified water Examples thereof include hot water discharged from the purified water distribution line 102 when the circulation line 100 and the purified water distribution line 102 are disinfected with hot water.

(Bypass line)
The bypass line 110 connects the first drainage introduction line 106 without passing the purified water that has passed through the purified water distribution line 102 to the purified water supply target when it is not necessary to distribute and supply the purified water to the purified water supply target. This is a line for directly supplying water to the main drainage line 104 via the main drainage line 104.
The end of the purified water distribution line 102 is detachably connected to the first end of the bypass line 110. The end of the first drainage introduction line 106 is detachably connected to the second end of the bypass line 110. When the purified water is distributed and supplied to the purified water supply target, the first end of the bypass line 110 is removed from the end of the purified water distribution line 102.

The bypass line 110 is usually composed of a flexible tube so that it can be easily attached to and detached from the end of the purified water distribution line 102 and the end of the first drainage introduction line 106.
A connector for detachably connecting the end of the purified water distribution line 102 and the end of the first drainage introduction line 106 is provided at the first end and the second end of the bypass line 110.

A sample port 118 is provided in the middle of the bypass line 110 so that a part of the purified water flowing through the bypass line 110 can be taken out for inspection. By providing the sample port 118, the purified water flowing in the bypass line 110 can be easily and uncontaminated. In addition, the accumulated water in the bypass line 110 can be drained. This allows us to meet the more stringent demands for pollution.
The bypass line 110 may be provided with a solenoid valve or the like for opening and closing the bypass line 110, if necessary.

(Control means)
The control device 80 is roughly configured with a processing unit (not shown), an interface unit (not shown), and a calendar timer (not shown).

The control device 80 starts and stops the supply of raw water to the activated charcoal filter 14, the check filter 16, the nanofilter membrane module 18, and the back-penetration membrane module 20; the purified water internal circulation line 40, the soft water transfer line 36, and the purified water transfer. Start and stop circulation of purified water to line 38; Start and stop circulation of purified water to external circulation line 100 of purified water; Start and stop discharge of retained water in purified water distribution line 102; Purified water tank 22 Start and stop heating of purified water inside; Start and stop supply of purified water to the purified water supply target; Control and stop discharge of wastewater from the purified water supply target, and these controls are required It can be performed at any date and time set in the calendar timer according to the above.

The calendar timer has a clock unit that manages the date and time, and a storage unit that stores the operation schedule of the purified water production apparatus. The calendar timer is designed to be able to transmit an electric signal at a set date and time stored in the storage unit.

The interface unit electrically connects the ultraviolet lamp 24, the heater 26, the temperature sensor, the flow rate sensor, the solenoid valve and the pump provided in each line, and the processing unit.

The processing unit drives the ultraviolet lamp 24 and the heater 26, opens and closes the solenoid valves provided in each line, drives the pump, etc., based on the electric signal from the calendar timer, the operation signal input to the processing unit, and the like. It controls.

Specifically, the processing unit performs the following control, for example.
When the purified water production apparatus 10 produces purified water, the processing unit opens the electromagnetic valve 52, the electromagnetic valve 56, and the electromagnetic valve 58 in the purified water production apparatus 10, and opens the raw water pump 70, the pressurizing pump 72, and the pressurizing unit. By driving the pump 74, the supply of raw water to the activated charcoal filter 14, the check filter 16, the nanofiltration membrane module 18 and the reverse osmosis membrane module 20 is started.

When the processing unit stops the production of purified water in the purified water production apparatus 10, the processing unit stops the raw water pump 70, the pressurizing pump 72 and the pressurizing pump 74 in the purified water producing apparatus 10, and causes the electromagnetic valve 52 and the electromagnetic valve. By closing the 56 and the electromagnetic valve 58, the supply of raw water to the activated charcoal filter 14, the check filter 16, the nanofiltration membrane module 18, and the reverse osmosis membrane module 20 is stopped.

When the purified water is circulated in the purified water production apparatus 10, the treatment unit drives the internal circulation pump 76 in the purified water production apparatus 10 to drive the purified water internal circulation line 40, the soft water transfer line 36 and the purified water. It initiates the circulation of purified water to the transfer line 38.

When the processing unit stops the circulation of purified water in the purified water production apparatus 10, the internal circulation pump 76 in the purified water production apparatus 10 is stopped, so that the purified water internal circulation line 40 and the soft water transfer line 36 are stopped. And to stop the circulation of purified water to the purified water transfer line 38.

The treatment unit opens the electromagnetic valve 112 in the purified water distribution line 102 and closes the electromagnetic valve 116 in the first wastewater introduction line 106 in order to constantly circulate the purified water in the purified water external circulation line 100. The external circulation pump 78 in the manufacturing apparatus 10 is constantly driven.

When discharging the accumulated water in the purified water distribution line 102, the treatment unit circulates the purified water to the purified water external circulation line 100 while driving the external circulation pump 78 in the purified water production apparatus 10. At the same time, by opening the electromagnetic valve 116 in the first drainage introduction line 106, the discharge of the accumulated water in the purified water distribution line 102 is started.

When stopping the discharge of the stagnant water in the purified water distribution line 102, the treatment unit starts the discharge of the stagnant water in the purified water distribution line 102, and then sets the electromagnetic valve 116 in the first wastewater introduction line 106. By closing, the discharge of the stagnant water in the purified water distribution line 102 is stopped.

When the purified water in the purified water tank 22 is heated, the treatment unit starts heating the purified water in the purified water tank 22 by driving the heater 26 in the purified water production apparatus 10.

When stopping the heating of the purified water in the purified water tank 22, the processing unit stops the heating of the purified water in the purified water tank 22 by stopping the heater 26 in the purified water production apparatus 10. is there.

The processing unit may be realized by dedicated hardware, and the processing unit is composed of a memory and a central processing unit (CPU), and a program for realizing the functions of the processing unit is stored in the memory. The function may be realized by loading and executing it.
Further, it is assumed that an input device, a display device, and the like are connected to the control device 80 as peripheral devices. Here, the input device refers to an input device such as a display touch panel, a switch panel, and a keyboard, and the display device refers to a liquid crystal display device, a CRT, or the like.

(Mechanism of action)
1. 1. In the purified water supply system 1 described above, the purified water production apparatus 10 for producing purified water and the purified water outside for circulating the purified water produced by the purified water production apparatus 10 to the outside of the purified water production apparatus 10. Since the circulation line 100 and the purified water distribution line 102 branched from the middle of the purified water external circulation line 100 are provided, the purified water produced by the purified water production apparatus can be distributed and supplied to the purified water supply target. Further, since the purified water production apparatus 10 is provided with a heating means (heater 26) for heating the purified water, the hot water obtained by heating the purified water is circulated to the purified water external circulation line 100 or the like. This makes it possible to disinfect the purified water supply system 1 with hot water. Since the purified water supply system 1 can be disinfected with hot water instead of the chemical solution, when the purified water supply system 1 is disinfected, there is no residual chemical solution and rinsing is unnecessary. The supply of purified water can be resumed in time, and the purified water used for disinfection can be reused. In addition, hot water disinfection is possible at all times except when purified water is supplied, and the purified water supply system 1 can be easily disinfected.

2. 2. Further, in the purified water supply system 1 described above, the control device 80 for controlling the opening and closing of the electromagnetic valve 112 of the drive of the heater 26 and the purified water distribution line 102 and the electromagnetic valve 116 in the first drainage introduction line 106 is used. To further prepare, hot water disinfection of the purified water supply system 1 and discharge of accumulated water in the purified water distribution line 102 can be performed periodically.

(Other embodiments)
The purified water supply system of the present invention includes a purified water production apparatus that produces purified water; a purified water circulation line that circulates purified water produced by the purified water production apparatus to the outside of the purified water production apparatus; and a purified water circulation line. It is provided with a purified water distribution line branched from the middle of the above; the purified water production apparatus may be provided with a heating means for heating the purified water, and is not limited to the purified water supply system 1 of the illustrated example. ..

For example, in the purified water supply system of the present invention, it is not always necessary to provide a bypass line and a drainage line.
Further, in the purified water supply system of the present invention, it is not always necessary to provide a control means for controlling the driving of the heating means and the opening / closing of the purified water distribution line.
Further, in the purified water supply system of the present invention, there may be only one wastewater introduction line for introducing wastewater into the main drainage line for each purified water distribution line and the purified water supply target.
Further, in the purified water supply system of the present invention, the ultrafiltration membrane filter 90 does not necessarily have to be provided.
Further, in the purified water supply system of the present invention, two or more purified water circulation lines may be provided for one purified water production apparatus, and two or more purified water production apparatus and two or more purified water circulation lines. And may be provided.
Further, in the purified water supply system of the present invention, a chemical solution tank for supplying the chemical solution to the purified water tank may be provided as needed.
Further, as the purified water producing apparatus, the purified water producing apparatus described in Japanese Patent No. 4990710, the purified water producing apparatus described in Patent No. 5425527, the purified water producing apparatus described in Patent No. 5582847, and the like are known. You may use the purified water production apparatus of.
Further, although only one reverse osmosis membrane module is used in the purified water production apparatus in the illustrated example, two or more reverse osmosis membrane modules may be used in parallel depending on the required amount of water.
Further, although the purified water tank in the purified water production apparatus is only one in the illustrated example, two or more may be used depending on the required amount of water.
Further, the purified water supply system of the present invention may be provided with a notification means for notifying that hot water is being disinfected. Examples of the notification means include a display on the screen of the display device of the control device 80, a display on the screen of a panel for remote control, a lamp, and the like.

<How to operate the purified water supply system>
While operating the purified water supply system of the present invention, the purified water produced by the purified water production apparatus is constantly circulated to the purified water circulation line in order to suppress the retention of purified water in the purified water circulation line. While circulating the purified water to the purified water circulation line, the accumulated water in the purified water distribution line 102 is discharged, the hot water disinfection of the purified water supply system 1 is performed, and the purified water is distributed and supplied to the purified water supply target.
Hereinafter, the operation method of the purified water supply system 1 will be specifically described.

(Production of purified water in purified water production equipment)
When the purified water production apparatus 10 produces purified water, the processing unit of the control device 80 opens the solenoid valve 52, the solenoid valve 56, and the solenoid valve 58 of the purified water production apparatus 10, and the raw water pump 70 and the pressurizing pump. The 72 and the pressurizing pump 74 are driven. As a result, the supply of raw water to the activated carbon filter 14, the check filter 16, the nanofiltration membrane module 18 and the reverse osmosis membrane module 20 is started.

The raw water supplied from the raw water tank 12 through the raw water supply line 30 is boosted by the raw water pump 70 of the raw water supply line 30 and then passed through the activated carbon filter 14. The raw water from which the residual chlorine in the raw water has been removed by the activated carbon filter 14 passes through the first raw water transfer line 32, the check filter 16 and the second raw water transfer line 34, and pressurizes the second raw water transfer line 34. After being boosted by the pump 74, it is supplied to the nanofiltration membrane module 18. A part of the raw water supplied to the nanofiltration membrane module 18 permeates through the nanofiltration membrane and is softened. On the other hand, the remaining raw water that has not passed through the nanofiltration membrane becomes concentrated water, which is discharged from the device drainage line 42 to the outside of the device through the first concentrated water discharge line 44.

The raw water softened by the nanofiltration membrane module 18 is boosted by the pressurizing pump 74 of the soft water transfer line 36 and then supplied to the reverse osmosis membrane module 20. A part of the raw water supplied to the reverse osmosis membrane module 20 permeates the reverse osmosis membrane to become purified water, and is stored in the purified water tank 22 through the purified water transfer line 38. On the other hand, the remaining raw water that has not permeated the reverse osmosis membrane becomes concentrated water, and is discharged from the device drainage line 42 to the outside of the device through the second concentrated water discharge line 46.

(Internal circulation and sterilization of purified water in purified water production equipment)
When sterilizing while circulating purified water in the purified water production apparatus 10, the processing unit of the control device 80 drives the internal circulation pump 76 in the purified water production apparatus 10, so that the purified water internal circulation line 40, The circulation of purified water to the soft water transfer line 36 and the purified water transfer line 38 is started. In addition, the ultraviolet lamp 24 in the purified water production apparatus 10 is driven.

The purified water stored in the purified water tank 22 is returned to the purified water tank 22 by the constantly driven internal circulation pump 76 via the purified water internal circulation line 40, the soft water transfer line 36 and the purified water transfer line 38. It is in a state of constant flow. Further, the purified water stored in the purified water tank 22 is constantly sterilized by the ultraviolet lamp 24.

(Circulation of purified water in the purified water circulation line)
Purified water is purified water produced by the purified water production apparatus 10 in order to suppress retention of purified water in the purified water external circulation line 100 even when the purified water is not distributed and supplied to the purified water supply target. It is always circulated to the external circulation line 100.

In order to constantly circulate purified water to the purified water external circulation line 100, the processing unit of the control device 80 opened the electromagnetic valve 112 in the purified water distribution line 102 and closed the electromagnetic valve 116 in the first drainage introduction line 106. In this state, the external circulation pump 78 in the purified water production apparatus 10 is driven.

(Discharge of accumulated water in the purified water distribution line)
When the accumulated water in the purified water distribution line 102 is discharged, the purified water is circulated to the purified water external circulation line 100, and the processing unit of the control device 80 causes the electromagnetic valve in the first drainage introduction line 106. By opening 116, the discharge of stagnant water in the purified water distribution line 102 is started. As a result, the accumulated water in the purified water distribution line 102 is discharged to the main drainage line 104 via the bypass line 110. After a lapse of a predetermined time, the processing unit of the control device 80 closes the solenoid valve 116 in the first drainage introduction line 106 to stop the discharge of the accumulated water in the purified water distribution line 102.

The discharge of the accumulated water in the purified water distribution line is performed, for example, based on the operation schedule stored in the storage unit of the calendar timer of the control device 80.
The frequency of discharging the accumulated water in the purified water distribution line 102 is preferably once every 30 to 180 minutes. The time for discharging the accumulated water in the purified water distribution line 102 is preferably 2 to 10 minutes each time.

(Hot water disinfection of purified water supply system)
When disinfecting the purified water external circulation line 100 with hot water, first, in the processing unit of the control device 80, the purified water sent from the purified water external circulation line 100 or the flow sensor provided in the purified water distribution line 102 is purified. Based on the flow rate information (electrical signal) of purified water flowing through the water external circulation line 100, it is determined whether or not the purified water is distributed and supplied to the purified water supply target. It can be determined that the purified water is distributed and supplied to the purified water supply target by comparing with the flow rate in the state where the purified water is not distributed and supplied. When purified water is distributed and supplied to the purified water supply target, hot water cannot flow to the purified water external circulation line 100. Therefore, the control device is used until the distribution and supply of purified water to the purified water supply target is completed. The treatment unit of 80 suspends the implementation of hot water disinfection of the purified water external circulation line 100.

When disinfecting the purified water external circulation line 100 with hot water, the processing unit of the control device 80 closes the electromagnetic valve 112 in the purified water distribution line 102 while circulating the purified water to the purified water external circulation line 100. By driving the heater 26 in the purified water production apparatus 10, heating of the purified water in the purified water tank 22 is started. As a result, hot water is circulated to the purified water external circulation line 100, and the purified water external circulation line 100 is disinfected with hot water. After a lapse of a predetermined time, the processing unit of the control device 80 stops the heater 26 in the purified water production device 10 to stop the heating of the purified water in the purified water tank 22.

When the purified water distribution line 102 is sterilized with hot water, the electromagnetic valve 112 and the first in the purified water distribution line 102 are circulated by the processing unit of the control device 80 while circulating the hot water to the purified water external circulation line 100. By opening the electromagnetic valve 116 in the drainage introduction line 106 of the above, the supply of hot water to the purified water distribution line 102 is started. As a result, the hot water flows into the purified water distribution line 102 and is discharged to the main drainage line 104 via the bypass line 110, so that the purified water distribution line 102 is disinfected with hot water. After a lapse of a predetermined time, the processing unit of the control device 80 closes the solenoid valve 112 in the purified water distribution line 102 and the solenoid valve 116 in the first drainage introduction line 106 to supply hot water to the purified water distribution line 102. To stop.

When the reverse osmosis membrane module 20 in the purified water production apparatus 10 is disinfected with hot water, the purified water in the purified water tank 22 is heated, and the internal circulation in the purified water production apparatus 10 is performed by the processing unit of the control device 80. By driving the pump 76, the circulation of hot water to the purified water internal circulation line 40, the soft water transfer line 36 and the purified water transfer line 38 is started. As a result, hot water is supplied to the reverse osmosis membrane module 20, and the reverse osmosis membrane module 20 is disinfected with hot water.

The hot water disinfection of the purified water supply system 1 is performed, for example, based on the operation schedule stored in the storage unit of the calendar timer of the control device 80.
The frequency of hot water disinfection of the purified water external circulation line 100 is preferably once every 2 to 7 days. The time for circulating hot water in the purified water external circulation line 100 is preferably 30 to 180 minutes each time.

The number of times of hot water disinfection of the purified water distribution line 102 is preferably 1 to 5 times during the hot water disinfection of the purified water external circulation line 100. The time for flowing hot water through the purified water distribution line is preferably 2 to 10 minutes each time.

The temperature of the hot water in the purified water tank 22 is determined by the processing unit of the control device 80 based on the temperature information (electric signal) of the purified water in the purified water tank 22 obtained by the temperature sensor of the purified water tank 22. Is adjusted by controlling.
The temperature of the hot water in the purified water tank 22 circulated in the purified water external circulation line 100 is preferably 80 to 97 ° C.

(Distribution and supply of purified water to the target of purified water supply)
FIG. 3 is a schematic configuration diagram showing a state in which a personal dialysis machine is connected to the purified water supply system of FIG. 1 as a purified water supply target.
When the purified water is distributed and supplied to the purified water supply target, the first end of the bypass line 110 is removed from the end of the purified water distribution line 102. Then, the end of the water pipe 202 of the personal dialysis machine 200 is connected to the end of the purified water distribution line 102, and the end of the drainage pipe 204 of the personal dialysis machine 200 is connected to the end of the second drainage introduction line 108. To connect.

When a temperature sensor is provided in the purified water external circulation line 100, first, in the processing unit of the control device 80, the temperature information (electric signal) of the purified water flowing through the purified water external circulation line 100 sent from the temperature sensor is used. Based on this, it is determined whether or not the purified water external circulation line 100 is being disinfected with hot water, and if the purified water external circulation line 100 is being disinfected with hot water, the electromagnetic valve 112 of the purified water distribution line 102 is closed. When the purified water external circulation line 100 is being disinfected with hot water, the purified water cannot be supplied to the personal dialysis apparatus 200. Therefore, until the hot water disinfection of the purified water external circulation line 100 is completed, the control device 80 The processing unit suspends the supply of purified water to the personal dialysis machine 200.

When supplying purified water to the personal dialysis apparatus 200, the purified water is circulated to the purified water external circulation line 100, and the purified water is supplied to the personal dialysis apparatus 200 by the processing unit of the control device 80. To start. The drainage from the personal dialysis machine 200 is discharged to the main drainage line 104 via the second drainage introduction line 108.

When the supply of purified water to the personal dialysis machine 200 is stopped, the processing unit of the control device 80 stops the supply of purified water to the personal dialysis machine 200.

(Mechanism of action)
In the operation method of the purified water supply system 1 described above, the purified water produced by the purified water production apparatus 10 is constantly circulated to the purified water external circulation line 100 while the purified water supply system 1 is operated. Therefore, the purified water produced by the purified water production apparatus can be distributed and supplied to the purified water supply target. Further, when the purified water external circulation line 100 and the purified water distribution line 102 are disinfected with hot water, the purified water is heated by the heating means (heater 26), so that the hot water obtained by heating the purified water is purified. It is circulated to the water external circulation line 100 or the like, and hot water disinfection of the purified water supply system 1 can be performed. Since the purified water supply system 1 can be disinfected with hot water instead of the chemical solution, when the purified water supply system 1 is disinfected, there is no residual chemical solution and rinsing is unnecessary. The supply of purified water can be resumed in time, and the purified water used for disinfection can be reused.

The purified water supply system of the present invention includes facilities and devices (personal dialysis machines, etc.) that require purified water in facilities such as medical facilities (hospitals, etc.) and factories (pharmaceutical factories, food factories, semiconductor device factories, etc.). It is useful as a system for supplying purified water to the water.

1 Purified water supply system, 10 Purified water production equipment, 12 Raw water tank, 14 Activated charcoal filter, 16 Check filter, 18 Nano filter membrane module, 20 Reverse osmosis membrane module, 22 Purified water tank, 24 Ultraviolet lamp, 26 Heater, 30 Raw water supply line, 32 1st raw water transfer line, 34 2nd raw water transfer line, 36 soft water transfer line, 38 purified water transfer line, 40 purified water internal circulation line, 42 drainage line for equipment, 44 1st concentrated water Discharge line, 46 Second concentrated water discharge line, 52 Electromagnetic valve, 56 Electromagnetic valve, 58 Electromagnetic valve, 60 Check valve, 62 Check valve, 64 Check valve, 70 Raw water pump, 72 Pressurized pump, 74 Addition Pressure pump, 76 internal circulation pump, 78 external circulation pump, 80 controller, 90 reverse osmosis membrane filter, 100 purified water external circulation line, 102 purified water distribution line, 104 main drainage line, 106 first drainage introduction line, 108 Second drainage introduction line, 110 bypass line, 112 electromagnetic valve, 116 electromagnetic valve, 118 sample port, 120 relay board, 122 flow sensor, 200 personal dialysis machine, 202 water conduit, 204 drainage pipe.

Claims (5)

Purified water production equipment that produces purified water,
A purified water circulation line that circulates the purified water produced by the purified water production apparatus to the outside of the purified water production apparatus.
A purified water distribution line branched from the middle of the purified water circulation line is provided.
The purified water production apparatus is provided with a heating means for heating the purified water .
A purified water supply system in which a flow rate sensor is provided in the purified water circulation line or the purified water distribution line . The purified water supply system according to claim 1, wherein a temperature sensor is provided in the purified water circulation line. The purified water supply system according to claim 1 or 2 , further comprising a control means for driving the heating means and controlling the opening and closing of the purified water distribution line. A method of operating the purified water supply system according to claim 1 .
While operating the purified water supply system, the purified water produced by the purified water production apparatus is constantly circulated in the purified water circulation line.
When disinfecting the purified water circulation line and the purified water distribution line with hot water, the purified water is heated by the heating means .
A method for operating a purified water supply system, which determines whether or not purified water is distributed and supplied to a purified water supply target based on the flow rate information of purified water sent from the flow rate sensor . A method of operating the purified water supply system according to claim 2.
While operating the purified water supply system, the purified water produced by the purified water production apparatus is constantly circulated in the purified water circulation line.
When disinfecting the purified water circulation line and the purified water distribution line with hot water, the purified water is heated by the heating means.
Based on the flow rate information of the purified water sent from the flow rate sensor, it is determined whether or not the purified water is distributed and supplied to the purified water supply target.
A method of operating a purified water supply system that determines whether or not the purified water circulation line is undergoing hot water disinfection based on the temperature information of purified water sent from the temperature sensor.

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