JP2013252505A - Apparatus of manufacturing water for dialysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus of manufacturing water for dialysis, capable of filtering tap water with a water pressure of tap water without using a pressurizing means such as a pump, and thereby capable of reducing noise and power consumption.SOLUTION: An apparatus of manufacturing water for dialysis includes a reverse osmosis membrane unit 20 to which tap water of 0.1 MPa or more to 0.5 MPa or less is supplied, a TOC (total organic carbon) removing unit 40 connected with a downstream side of a permeated water outlet 20b of the reverse osmosis membrane unit 20, a pure water take-out port 45 installed on a downstream side of the TOC removing unit 40, and a TOC meter 50 diverged and connected between the reverse osmosis membrane unit 20 and the pure water take-out port 45.

Description

  The present invention relates to a dialysis water production apparatus.

  In the semiconductor field and pharmaceutical field, ultra-pure that removes TOC components such as organic substances, bacteria and bacteria as much as possible in addition to dissolved substances such as ions and suspended particulates in accordance with recent technological innovation and technological advancement. There is a need for water. Such ultrapure water is produced by a pure water production apparatus such as a reverse osmosis membrane apparatus or an ion exchange apparatus.

  According to the pure water manufacturing apparatus using a reverse osmosis membrane, the permeated water in which only the water molecules of the supplied water are selectively permeated and the impurities other than the water molecules are concentrated through the reverse osmosis membrane. Water is obtained. Ultrapure water is produced by removing TOC components such as bacteria from this permeated water. The ultrapure water produced in this way is used as dialysis water that requires a high impurity removal rate.

  For example, Patent Document 1 discloses a reverse osmosis membrane for filtering pure water and obtaining pure water and concentrated water, pure water means for receiving pure water supplied from the reverse osmosis membrane, Disclosed is a pure water production apparatus including a cathode and an anode which are supplied with concentrated water, electrolyzed the concentrated water to improve the water quality, and water quality improving means for supplying the concentrated water with improved water quality to the reverse osmosis membrane again. ing.

JP 2011-245371 A

  However, in a conventional pure water production apparatus using a reverse osmosis membrane, it is necessary to install a pressurizing means such as a pump on the upstream side of the reverse osmosis membrane. Further, there is a problem that noise and power consumption increase due to the installation of the pressurizing means. Since the pressurizing means requires electric power, there is a possibility that the pure water production apparatus cannot be used in an emergency such as a power failure.

  This invention is made | formed in view of the said situation, and it aims at providing the water production apparatus for dialysis which can reduce a noise and power consumption, without using pressurizing means, such as a pump.

  The present invention provides a reverse osmosis membrane unit to which tap water of 0.1 MPa or more and 0.5 MPa or less is supplied, a TOC removal unit connected to a downstream side of a permeate discharge port of the reverse osmosis membrane unit, and the TOC removal And a pure water outlet installed on the downstream side of the section.

  According to the present invention, there is provided a dialysis water production apparatus capable of filtering tap water with a tap water pressure of 0.1 MPa or more and 0.5 MPa or less without using a pressurizing means to reduce noise and power consumption. Can do.

It is a block diagram of the water production apparatus for dialysis which concerns on 1st Embodiment of this invention. It is a block diagram of the dialysis water manufacturing apparatus which concerns on 2nd Embodiment of this invention.

  Hereinafter, a dialysis water production apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

(First embodiment)
The dialysis water production apparatus 100 of the present embodiment shown in FIG. 1 includes a reverse osmosis membrane unit 20, a TOC removing unit 40, a pure water outlet 45, a TOC meter 50, a washing drain channel 54, and a back washing unit. 60.

  The reverse osmosis membrane unit 20 is provided with a water supply port 20 a connected to a water tap (not shown) via the pipe 1. In the pipe 1 between the water tap and the water supply port 20a, a manual valve 11, a water stop solenoid valve 12, a filtration filter 14, an activated carbon filter 16, a low pressure switch 18, and a pressure gauge 19 are sequentially provided from the upstream side. And are provided.

  The manual valve 11 and the water stop solenoid valve 12 are arranged in parallel in the pipe 1. The manual valve 11 is normally closed, but is manually opened by the user in an emergency when the dialysis water production apparatus 100 is not energized, such as during a power failure. Thereby, even if there is no power supply, the tap water from a water tap can be supplied to the dialysis water manufacturing apparatus 100. The water stop solenoid valve 12 is activated when a water leak occurs in the dialysis water production apparatus 100 and stops supplying tap water to the dialysis water production apparatus 100.

  The filtration filter 14 is arranged to remove physical impurities (for example, rust) contained in tap water. The activated carbon filter 16 is disposed to remove chlorine contained in tap water discharged from the filter 14. The low pressure switch 18 is arranged to stop the supply of tap water to the dialysis water production apparatus 100 when the pressure of tap water from which chlorine has been removed by the activated carbon filter 16 falls below a predetermined pressure. The pressure gauge 19 is arranged for measuring the pressure of tap water supplied to the reverse osmosis membrane unit 20.

  The tap water from the tap is supplied or stopped by the manual valve 11, the water stop solenoid valve 12, the filtration filter 14, the activated carbon filter 16, the low pressure switch 18, and the pressure gauge 19 described above, and impurities are removed. Although pressure measurement is performed, the present invention is not limited to this configuration and arrangement. These configurations and their arrangement can be appropriately selected and changed according to the pretreatment necessary for the tap water supplied to the reverse osmosis membrane unit 20.

  The reverse osmosis membrane unit 20 separates the tap water supplied through the water supply port 20a into permeated water and concentrated water by the reverse osmosis membrane. This reverse osmosis membrane is a so-called low pressure reverse osmosis membrane, and it is not necessary to introduce tap water pressurized by a pressurizing means such as a pump. The above-mentioned separation can be performed only with the pressure of tap water (hereinafter simply referred to as tap pressure). Examples of such a low pressure reverse osmosis membrane include a synthetic polymer composite membrane.

  In FIG. 1, the illustration of the reverse osmosis membrane in the reverse osmosis membrane unit 20 is omitted, but the reverse osmosis membrane installation shape in the reverse osmosis membrane unit 20 can separate the permeated water and the concentrated water as described above. Although not particularly limited, for example, a cylindrical shape may be mentioned. Specifically, a plurality of the reverse osmosis membranes are wound around a water collecting pipe connected to the permeate discharge port 20b of the reverse osmosis membrane unit 20. Between the reverse osmosis membrane and the reverse osmosis membrane, a spacer for securing a flow path through which tap water flows is sandwiched. Further, another spacer for securing a flow path through which the filtered permeated water flows is sandwiched inside each reverse osmosis membrane. The tap water flows into the flow path between the reverse osmosis membranes and is filtered through the reverse osmosis membrane by the tap pressure as described above. Since the reverse osmosis membrane is a membrane having many pores of about 1 to 2 nm, water molecules contained in tap water are selectively permeated and impurities other than water molecules such as ions and salts are not permeated. For this reason, the permeated water that has permeated through the reverse osmosis membrane penetrates into the reverse osmosis membrane and then flows into the water collecting pipe and is taken out of the permeate discharge port 20b. Concentrated water in which impurities that have not permeated through the reverse osmosis membrane are concentrated flows as it is through the flow path between the reverse osmosis membranes and is collected at the concentrated water discharge port 20c, and from the concentrated water discharge port 20c to outside the reverse osmosis membrane unit 20. Discharged. In addition, the flow rate ratio of the permeated water discharged from the permeated water discharge port 20b and the concentrated water discharged from the concentrated water discharge port 20c is 1: 1 to 5, and the flow rate of the permeated water is larger than the flow rate of the concentrated water. Absent.

  The pipe 2 between the permeate discharge port 20b of the reverse osmosis membrane unit 20 and the TOC removal unit 40 connected to the downstream side thereof has a conductivity meter 32, an outlet solenoid valve 34, a heater 36, and a high pressure switch. 37 is provided.

  The conductivity meter 32 is arranged to measure the conductivity of the permeated water discharged from the reverse osmosis membrane unit 20. The outlet solenoid valve 34 is normally open and transports the permeate flowing through the pipe 2 to the downstream side. However, the dialysis water production apparatus 100 is in a reverse osmosis membrane cleaning process described later, or is in a stopped state due to a standby state or occurrence of an abnormality. When it is arranged to stop transport of permeate. The heater 36 is disposed to adjust the temperature of the permeated water to a predetermined temperature range. The temperature range of the permeated water can be, for example, 15 to 20 ° C. The high pressure switch 37 is arranged to stop the dialysis water production apparatus 100 when the flow of permeate stops.

  The permeated water from the reverse osmosis membrane unit 20 is transported downstream or stopped by the conductivity meter 32, the outlet solenoid valve 34, the heater 36, and the high pressure switch 37 described above, and various measurements are performed. It is not limited to arrangement. These configurations and their arrangement can be appropriately selected and changed according to the pretreatment necessary for the permeated water supplied to the TOC removing unit 40.

  The TOC removing unit 40 is arranged to remove the TOC component contained in the permeated water. Specifically, the TOC removal unit 40 is provided with an ultraviolet light source 42 and an endotoxin filter 44. The ultraviolet light source 42 is installed in, for example, a casing, and irradiates the permeated water supplied to the casing with ultraviolet rays to remove the TOC component. At this time, you may supply the catalyst etc. which accelerate | stimulate the TOC removal effect | action to permeated water as needed. As the ultraviolet light source 42, for example, a light source that emits ultraviolet light having a wavelength of 220 to 260 nm can be used. Further, an LED may be used as the ultraviolet light source 42. By using the LED, power consumption can be reduced. Furthermore, it is preferable to use a TOC removing unit that does not require a power source or the like instead of the ultraviolet light source 42.

  The endotoxin filter 44 is arranged for sterilization by removing endotoxin contained in the permeated water. Then, pure water is discharged from a pure water outlet 45 installed downstream of the endotoxin filter 44. As such an endotoxin filter 44, for example, a hydrophobic polysulfone membrane, a hydrophobic polyester sulfone membrane, or a polyester polymer alloy membrane can be used. In particular, it is preferable to use a filter in which a polyester polymer alloy film having a strong endotoxin adsorption action and another film are combined.

  The TOC removing unit 40 including the ultraviolet light source 42 and the endotoxin filter 44 produces pure water that has been subjected to TOC removal and sterilization. In addition, the structure of the TOC removal part 40 is not limited to the combination of the ultraviolet light source 42 and the endotoxin filter 44, What is necessary is just a structure which can remove fungi, such as a TOC component and endotoxin contained in permeated water.

  The pure water outlet 45 is installed on the downstream side of the TOC removing unit 40. The pure water taken out from the pure water outlet 45 may be stored in a pure water container or the like (not shown), or may be directly supplied to a dialysis apparatus or the like for hemodialysis.

  The TOC meter 50 is branched and connected between the reverse osmosis membrane unit 20 and the pure water outlet 45 via the pipe 4. In this embodiment, the TOC removing unit 40 and the pure water outlet 45 are connected to each other. It is branched from the pipe 2 between and connected. Although the TOC meter 50 may be installed in series in the pipe 2 between the TOC removing unit 40 and the pure water outlet 45, the allowable water amount supplied to the TOC meter 50 is generally discharged to the downstream side of the TOC removing unit 40. Since it is less than the amount of water produced, it is preferable to install as shown in FIG. The ratio of the amount of water supplied to the TOC meter 50 and a three-way solenoid valve 55 described later is preferably in the range of 1:50 to 1:70, for example, the amount of water to the TOC meter 50: the amount of water to the three-way solenoid valve 55.

  The TOC meter 50 measures the TOC concentration of pure water discharged from the TOC removing unit 40. TOC (Total Organic Carbon) is a so-called total organic carbon that indicates the total amount of organic matter including bacteria, pyrogens (pyrogenic substances), bacteria, and the like that can be oxidized in water in terms of the amount of carbon. For the TOC meter 50, a device generally used for TOC measurement can be used. In the conventional pure water production apparatus using the reverse osmosis membrane, the TOC concentration of the permeated water was not measured and it was not possible to confirm that the TOC contained in the pure water was removed. In the manufacturing apparatus 100, since the TOC meter 50 is installed, the TOC concentration of pure water is measured before being discharged to the pure water outlet 45, and it can be confirmed that the TOC is removed. The TOC concentration at this time is preferably less than 500 ppb, for example.

  The cleaning drainage channel 54 is branched and connected between the TOC removing unit 40 and the pure water outlet 45 through the pipe 3. As shown in FIG. 1, the cleaning drainage channel 54 may be connected to a drainage channel on the downstream side of the backwashing unit 60 described later, or may be connected to an individual drainage channel.

  For example, a three-way solenoid valve 55 is installed at the connection position of the flow path between the TOC removing unit 40 and the pure water outlet 45 and the cleaning drainage channel 54. The three-way solenoid valve 55 switches and discharges the introduced pure water to either the pure water outlet 45 or the cleaning drainage channel 54. As will be described later in the pure water production method, during normal pure water production, the pure water discharged from the TOC removing unit 40 is discharged to the pure water outlet 45 by the three-way solenoid valve 55. The pure water discharged from the pure water outlet 45 has impurities and TOC components removed at a very high removal rate and can be used as dialysis water.

  On the other hand, during the tap water, permeate, and pure water channel cleaning process of the dialysis water production apparatus 100, the pure water discharged from the TOC removing unit 40 is transported to the cleaning drain channel 54 by the three-way solenoid valve 55. That is, the flow path of the dialysis water production apparatus 100 can be cleaned by installing the cleaning drainage channel 54 and switching the flow path of the pure water by the three-way solenoid valve 55 or the like. Such channel washing is preferably performed in about 15 minutes each time the dialysis water production apparatus 100 is used, for example.

The backwash unit 60 is connected to the downstream side of the concentrated water discharge port 20 c of the reverse osmosis membrane unit 20 via the pipe 5. The reverse washing unit 60 once flushes water in the reverse direction, that is, upstream of normal pure water production, to wash away turbid substances and the like accumulated in the reverse osmosis membrane of the reverse osmosis membrane unit 20. Tap water containing turbid substances is discharged through the concentrated water outlet 20c. The water for washing away turbid substances may be the concentrated water of the reverse osmosis membrane unit 20, or tap water or industrial water supplied from the outside of the dialysis water production apparatus 100. Water containing turbid substances and the like again passes through the backwash section 60 and is discharged to the drainage channel.
FIG. 1 illustrates a backwashing unit 60 in which a flushing electromagnetic valve 61 and a drainage adjustment manual valve 62 are installed in parallel with the pipe 5. The flushing solenoid valve 61 is closed during a normal pure water production process and a flow path washing process of the dialysis water production apparatus 100. On the other hand, the reverse osmosis membrane unit 20 is opened during the cleaning process of the reverse osmosis membrane. The drainage adjustment manual valve 62 adjusts the drainage amount of water containing turbid substances. As a result, the flow rate of pure water for dialysis is adjusted. By installing the reverse washing section 60, it becomes possible to wash the reverse osmosis membrane unit 20 and remove turbid substances accumulated in the reverse osmosis membrane. Such cleaning of the reverse osmosis membrane is preferably performed in about 1 minute each time the dialysis water production apparatus 100 is used, for example.

Next, a pure water production method using the dialysis water production apparatus 100 will be described.
The dialysis water production apparatus 100 normally operates in the pure water production process, but the user operates in the flow path cleaning process by switching the three-way electromagnetic valve 55 and opens and closes the flushing electromagnetic valve 61 of the backwashing unit 60. Operates in reverse osmosis membrane cleaning process.

[Pure water production process]
When producing pure water, the tap water supplied from the tap, the permeated water from the reverse osmosis membrane unit 20, and the pure water discharged from the TOC removing unit 40 flow as shown in the flow path A shown in FIG. In addition, in FIG. 1, the relative water quantity which flows through each flow path is shown by the length of the arrow.

In the normal pure water production process, first, the pure water introduced into the three-way electromagnetic valve 55 is switched to be discharged to the pure water outlet 45, and the flushing electromagnetic valve 61 of the backwashing unit 60 is closed.
And tap water of 0.1 MPa or more and 0.5 MPa or less is supplied from a tap. The manual valve 11 is normally closed and the tap water is transported to the downstream side via the water stop solenoid valve 12. However, in the event of an emergency when the dialysis water production apparatus 100 is not energized, such as a power failure, the user manually opens the manual valve 11 to transport the tap water downstream through the manual valve 11. Thereby, even if there is no power source in the dialysis water production apparatus 100, tap water from the water tap can be supplied to the dialysis water production apparatus 100 and pure water can be produced as described below. When water leakage occurs in the dialysis water production apparatus 100, the water stop electromagnetic valve 12 is operated to stop the transportation of tap water downstream.

  Next, impurities such as rust and chlorine contained in tap water are sequentially removed by the filtration filter 14 and the activated carbon filter 16. On the downstream side, the pressure of the tap water is confirmed by the pressure gauge 19, and when the pressure of the tap water drops below a predetermined pressure, the operation of the dialysis water production apparatus 100 is stopped by the low pressure switch 18.

  Next, tap water from which impurities and chlorine have been removed is supplied to the reverse osmosis membrane unit 20 from the water supply port 20a. In the reverse osmosis membrane unit 20, water molecules contained in tap water are selectively permeated from the reverse osmosis membrane only by tap water pressure, and the obtained permeate is discharged from the permeate discharge port 20b. At the same time, concentrated water enriched with impurities that have not permeated through the reverse osmosis membrane is discharged from the concentrated water outlet 20c.

  Next, the conductivity of the permeated water discharged from the permeated water discharge port 20 b is measured by the conductivity meter 32. However, when the dialysis water production apparatus 100 is in a reverse osmosis membrane cleaning process, which will be described later, or in a standby state or in a stopped state due to an abnormality, the permeated water is stopped by the outlet solenoid valve 34. Thereafter, if the water temperature of the permeated water is lower than the predetermined range, the heater 36 is operated to increase the water temperature of the permeated water, and the water temperature of the permeated water is adjusted to be within the predetermined range. When the flow of permeate stops due to some abnormality, the high-pressure switch 37 stops the dialysis water production apparatus 100.

  Next, the permeated water is supplied to the TOC removing unit 40. The introduced permeated water is irradiated with ultraviolet light from the ultraviolet light source 42 to remove the TOC component contained in the permeated water. When the TOC component contained in the permeated water is removed by a chemical reaction, a catalyst or the like that promotes the chemical reaction may be supplied to the permeated water. Subsequently, the permeated water from which the TOC component has been removed is supplied to the endotoxin filter 44. The endotoxin filter 44 removes endotoxin contained in the permeated water. As a result, pure water that is sterilized after removing the TOC component from the permeated water is discharged from the TOC removing unit 40.

  Next, pure water is supplied separately to the TOC meter 50 and the three-way solenoid valve 55. The ratio of the amount of pure water supplied to the TOC meter 50 and the three-way solenoid valve 55 is, for example, about 1: 62.5 in the amount of water supplied to the TOC meter 50: the amount of water supplied to the three-way solenoid valve 55. For example, the amounts of pure water supplied to the TOC meter 50 and the three-way solenoid valve 55 are 8 ml / min and 500 ml / min, respectively. The pure water supplied to the three-way electromagnetic valve 55 is transported to the pure water outlet 45.

  Next, the TOC content of pure water is measured by the TOC meter 50. Thereby, it can confirm that the TOC content of pure water is a predetermined range (for example, less than 500 ppb). The pure water after measuring the TOC content with the TOC meter 50 is discharged to a drainage channel and transported to a drainage unit (not shown) outside the dialysis water production apparatus 100.

  The pure water transported to the pure water outlet 45 and taken out from the pure water outlet 45 is supplied to, for example, a pure water container or dialysis machine outside the dialysis water production apparatus 100. The pure water produced by the dialysis water production apparatus 100 has impurities and TOC components removed at an extremely high removal rate, and can be used as dialysis water in medical equipment including artificial dialysis equipment.

  The concentrated water discharged from the concentrated water discharge port 20 c of the reverse osmosis membrane unit 20 is transported to the drainage channel via the backwashing unit 60 and discharged to a drainage unit (not shown) outside the dialysis water production apparatus 100.

[Flow path cleaning process]
When the flow path of tap water, permeated water, or pure water of the dialysis water production apparatus 100 is contaminated, the flow paths such as the pipes 1 and 2 are washed. The flow path may be washed, for example, for about 15 minutes each time the dialysis water production apparatus 100 is used. Moreover, you may implement regularly and you may implement irregularly.

  In the flow path cleaning process, the tap water supplied from the water tap, the permeated water from the reverse osmosis membrane unit 20 and the pure water discharged from the TOC removing unit 40 flow as shown in the flow path B shown in FIG. First, tap water, permeated water, and pure water from the water tap to the three-way solenoid valve 55 are supplied and transported by the same operation as the above-described normal pure water manufacturing method. Concentrated water is also treated in the same manner as in the normal pure water production method. At this time, the pure water contains contaminants attached to the flow path.

  Next, the three-way solenoid valve 55 is switched so that all the pure water containing the contaminants transported to the three-way solenoid valve 55 (hereinafter referred to as contaminated water) is discharged to the cleaning drainage channel 54. The flushing electromagnetic valve 61 of the backwash unit 60 is closed. The contaminated water introduced into the cleaning drainage channel 54 is discharged to a drainage unit (not shown) outside the dialysis water production apparatus 100 through the drainage channel. By the operation in such a flow path cleaning process, the flow path of the dialysis water production apparatus 100 is cleaned.

[Reverse osmosis membrane cleaning process]
The reverse osmosis membrane is washed when a large amount of impurities or the like contained in tap water adhere to the reverse osmosis membrane of the reverse osmosis membrane unit 20 as a turbid substance. The reverse osmosis membrane may be washed in about 1 minute each time the dialysis water production apparatus 100 is used, for example. Moreover, you may implement regularly and you may implement irregularly.

  In the reverse osmosis membrane cleaning process, the tap water supplied from the water tap and the concentrated water from the reverse osmosis membrane unit 20 flow as shown in the flow path C shown in FIG. First, the flushing electromagnetic valve 61 of the backwash unit 60 is opened. The three-way solenoid valve 55 may hold the state before switching to the reverse osmosis membrane cleaning process. By opening the flushing electromagnetic valve 61, the reverse osmosis membrane is cleaned, and the contaminated water containing the turbid material removed from the reverse osmosis membrane is transported to the downstream drainage channel. Further, by operating the drainage adjustment manual valve 62, the amount of contaminated water discharged from the concentrated water discharge port 20c is adjusted. At this time, the amount of permeated water discharged from the permeated water discharge port 20b is also adjusted. As described above, the reverse osmosis membrane may be cleaned by separately supplying tap water or industrial water to the upstream side through the backwashing unit 60 and backwashing.

  According to the dialysis water production apparatus 100 and the pure water production method of the present embodiment described above, the reverse osmosis membrane unit 20 uses a reverse osmosis membrane that can separate tap water into permeate and concentrated water only by tap pressure. Thus, the tap water is filtered at a tap pressure of 0.1 MPa or more and 0.5 MPa or less without using a pressurizing means such as a pump on the upstream side of the reverse osmosis membrane unit 20, and the noise and power consumption of the dialysis water production apparatus 100 are filtered. Can be reduced.

  In the dialysis water production apparatus 100 of the present embodiment, the reverse osmosis membrane that can filter tap water by tap pressure, the above-described piping method, and the TOC removal unit 40 that does not use a power source or the like may be combined. In addition, power generation (hydropower generation or the like) and power storage in the dialysis water production apparatus 100 may be performed, and the generated and stored power may be supplied to the TOC removing unit 40 and other power sources. According to the dialysis water production apparatus 100 and the pure water production method, pure water can be produced by operating the dialysis water production apparatus 100 even when commercial power is not supplied, for example, due to a power failure.

  In the dialysis water production apparatus 100 and the pure water production method of the present embodiment, the TOC is removed from the permeated water discharged from the reverse osmosis membrane unit 20 by the TOC removal unit 40, and the TOC meter 50 removes the TOC from the TOC removal unit 40. Measure the TOC content of the discharged pure water. Thereby, the TOC content of pure water that has not been confirmed in the conventional dialysis water production apparatus 100 can be detected, and it can be confirmed that TOC has been removed in the pure water for dialysis.

  Furthermore, the drainage channel 54 for washing and the three-way solenoid valve 55 are installed in the dialysis water production apparatus 100, and the three-way solenoid valve 55 is switched to adhere to the tap water, permeate water, and pure water flow paths of the dialysis water production apparatus 100. The contaminated material can be washed away with various types of water, and the contaminated water can be discharged to the cleaning drainage channel 54 to clean the channel. In addition, the reverse osmosis membrane 60 can be washed by rinsing away the turbid substances adhering to the reverse osmosis membrane of the reverse osmosis membrane unit 20 by installing the reverse washing unit 60.

(Second Embodiment)
Subsequently, a dialysis water production apparatus according to another embodiment of the present invention will be described. In addition, in the component of the dialysis water production apparatus 110 of this embodiment shown in FIG. 2, the same component as the component of the dialysis water production apparatus 100 shown in FIG. Omitted.

  In the dialysis water production apparatus 110, a pressure reducing valve 31, a conductivity meter 32, an outlet electromagnetic valve 34, and a heater 36 are provided between the permeated water outlet 20 b of the reverse osmosis membrane unit 20 and the TOC removing unit 40. Yes. The pressure reducing valve 31 adjusts the water pressure of the permeated water when the water pressure of the permeated water becomes higher than the water pressure resistance of the conductivity meter 32, the outlet solenoid valve 34, the heater 36, the ultraviolet light source 42, the endotoxin filter 44, and the three-way solenoid valve 55. Lower. The operations of the conductivity meter 32, the outlet solenoid valve 34, and the heater 36 are the same as the operations of the conductivity meter 32, the outlet solenoid valve 34, and the heater 36 in the dialysis water production apparatus 100 of the first embodiment. The description is omitted.

  The TOC meter 50 is branched and connected between the permeated water outlet 20b of the reverse osmosis membrane unit 20 and the pressure reducing valve 31 provided on the upstream side of the pure water outlet 45. Since the operation of the TOC meter 50 is the same as the operation of the TOC meter 50 in the dialysis water production apparatus 100 of the first embodiment, detailed description thereof is omitted. The ratio of the amount of water supplied to the TOC meter 50 and the pressure reducing valve 31 is preferably in the range of 1:50 to 1:70 in the amount of water supplied to the TOC meter 50: the amount of water supplied to the pressure reducing valve 31, for example. For example, when the amount of water supplied to the pressure reducing valve 31 is 500 ml / min, the amount of water supplied to the TOC meter 50 can be 8 ml / min. By arranging the TOC meter 50 in this way, it is possible to prevent bacteria from being generated at the branch portion of the flow path of the permeate to the TOC meter 50.

  An ion exchange resin filter 48 is provided on the upstream side of the TOC meter 50 of the dialysis water production apparatus 110. The ion exchange resin filter 48 removes cations and anions contained in the introduced permeated water. As such an ion exchange resin filter 48, a mixed resin for ultrapure water can be used.

  Regarding the components other than the pressure reducing valve 31, the conductivity meter 32, the outlet electromagnetic valve 34, the heater 36, the ion exchange resin filter 48, and the TOC meter 50 described above, the dialysis water production apparatus 100 according to the first embodiment. Since the arrangement and function of each component in FIG.

  Next, a pure water production method using the dialysis water production apparatus 110 will be described. Similar to the dialysis water production apparatus 100 of the first embodiment, the dialysis water production apparatus 110 can operate in any one of a pure water production process, a channel washing process, and a reverse osmosis membrane washing process.

[Pure water production process]
After supplying tap water of 0.1 MPa or more and 0.5 MPa or less from the water tap, the permeated water is discharged from the permeated water outlet 20b of the reverse osmosis membrane unit 20 and the concentrated water is discharged from the concentrated water outlet 20c. A process performs the process similar to the manufacturing process of the pure water in the dialysis water manufacturing apparatus 100 of 1st Embodiment. The concentrated water discharged from the concentrated water discharge port 20 c is transported to the drainage channel via the backwashing unit 60 and discharged to a drainage unit (not shown) outside the dialysis water production apparatus 110.

  Next, the permeated water discharged from the permeated water discharge port 20 b is supplied separately to the pressure reducing valve 31 and the ion exchange resin filter 48. The ratio of the amount of pure water supplied to the pressure reducing valve 31 and the ion exchange resin filter 48 is preferably set in consideration of the allowable water amount of the TOC meter 50. The amount of water supplied to the TOC meter 50: the amount of water supplied to the pressure reducing valve 31 For example, about 1: 62.5. Specifically, the amounts of pure water supplied to the pressure reducing valve 31 and the ion exchange resin filter 48 are 8 ml / min and 500 ml / min, respectively.

  The water pressure of the permeated water introduced into the pressure reducing valve 31 is determined by the respective water pressure resistances of the conductivity meter 32, the outlet electromagnetic valve 34, the heater 36, the ultraviolet light source 42, the endotoxin filter 44, and the three-way electromagnetic valve 55 provided on the downstream side. If it becomes higher, lower the permeate water pressure (or stop the permeate transport). Thereafter, the conductivity of the permeated water is measured by the conductivity meter 32. However, when the dialysis water production apparatus 110 is in the process of washing the reverse osmosis membrane or is in a standby state or in a stopped state due to an abnormality, the permeated water is stopped by the outlet solenoid valve 34. Thereafter, if the water temperature of the permeated water is lower than the predetermined range, the heater 36 is operated to increase the water temperature of the permeated water, and the water temperature of the permeated water is adjusted to be within the predetermined range.

  Next, the permeated water whose temperature is adjusted by the heater 36 is supplied to the TOC removing unit 40. Since the TOC component removal step of the permeated water in the TOC removal unit 40 is the same as the TOC component removal step of the TOC removal unit 40 in the pure water production process in the dialysis water production apparatus 100 of the first embodiment, the description thereof is omitted. To do. Thereafter, all the pure water discharged from the TOC removing unit 40 via the three-way solenoid valve 55 is transported to the pure water outlet 45 and taken out from the pure water outlet 45. The supply destination and application of the pure water are the same as the pure water produced by the dialysis water production apparatus 100 of the first embodiment.

[Flow path cleaning process]
Similarly to the dialysis water production apparatus 100 of the first embodiment, when the tap water, permeate water, and pure water flow paths of the dialysis water production apparatus 110 are contaminated, the flow paths are washed. Cleaning of the flow path may be performed regularly or irregularly.
The dialysis water production according to the first embodiment except that the permeated water branched between the permeated water outlet 20b of the reverse osmosis membrane unit 20 and the pressure reducing valve 31 is supplied to the TOC meter 50 via the ion exchange resin filter 48. The same process as the flow path cleaning process in the apparatus 100 is performed.

[Reverse osmosis membrane cleaning process]
The operation purpose, frequency, and steps of the reverse osmosis membrane cleaning process of the dialysis water production apparatus 110 are the same as those of the reverse osmosis membrane cleaning process in the dialysis water production apparatus 100 of the first embodiment.

  According to the dialysis water production apparatus 110 and the pure water production method of the present embodiment described above, the permeate discharge port 20b of the reverse osmosis membrane unit 20 and the pressure reducing valve 31 are connected to the upstream branch point of the flow path including the TOC meter 50. And by providing an ion exchange resin filter 48 on the upstream side of the TOC meter 50, the permeated water is supplied to the TOC meter 50 instead of pure water. Can be prevented. Moreover, the same effect as the dialysis water production apparatus 100 can be obtained.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

  20a ... Water supply port, 20 ... Reverse osmosis membrane unit, 20b ... Permeate discharge port, 40 ... TOC removal part, 45 ... Pure water outlet, 100, 110 ... Water production apparatus for dialysis

Claims (1)

A reverse osmosis membrane unit to which tap water of 0.1 MPa to 0.5 MPa is supplied;
A TOC remover connected to the downstream side of the permeate outlet of the reverse osmosis membrane unit;
A pure water outlet installed on the downstream side of the TOC removing unit;
An apparatus for producing dialysis water, comprising:

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