JP6056476B2 - Pure water production system - Google Patents

Description

  The present invention relates to a pure water production system, and more particularly to a pure water production system for producing pure water for pharmaceutical production.

  In many cases, the number of general bacteria in a pure water device for medical use is controlled at 100 bacteria / mL or less, which is the general number of bacteria according to tap water standards, and the system is regularly sterilized to maintain this. ing. As a sterilization method, cleaning with chemicals using hydrogen peroxide or sodium hypochlorite can be mentioned. However, in cleaning with chemicals, water treatment components that make up the main resin, reverse osmosis membrane devices, and electrodeionization devices that make up the device are subject to deterioration by chemicals. I went. For this reason, the effect of the management of general bacteria was not sufficient.

  On the other hand, in recent years, a method of sterilizing the entire system with hot water or warm water by imparting heat resistance to these main water treatment components is becoming mainstream.

  In this case, the reverse osmosis membrane, which is a water treatment component, has a membrane differential pressure and an inlet pressure upper limit set at high temperatures to prevent membrane damage. Normally, this value is as low as 0.1-0.2 MPa in differential pressure and 0.1-0.3 MPa in inlet pressure, so far, the treated water of the first stage reverse osmosis membrane apparatus has passed through the subsequent reverse osmosis membrane apparatus. The form of the two-stage reverse osmosis membrane device to be made was not able to be taken.

  In order to solve this problem, a method of realizing low-pressure operation at the time of sterilization through a pump between the first-stage reverse osmosis membrane device and the second-stage reverse osmosis membrane device can be considered. In addition to being bulky, there are circumstances where it is desirable not to provide a retention portion as much as possible when manufacturing water for pharmaceutical production. There was a circumstance where it would be desirable to avoid a pump retention section that only allows water to pass during pure water production other than during heat sterilization, so that the apparatus has no liquid pool.

  In addition, when raw water having a high raw water hardness is processed, in order to maintain the hardness supply standard when water is passed to the subsequent electrodeionization apparatus, the single-stage reverse osmosis membrane apparatus alone may not reach the hardness supply standard.

  In such a case, a water softener was installed in front of the reverse osmosis membrane device, and the hardness component was achieved by replacing the hardness component with sodium in advance. However, the installation of the water softener required regular salt replenishment, and labor was required for operation management, and there was a circumstance that it was not desirable to adopt as much as possible.

  In view of the above-mentioned circumstances, the present invention can pass water in series with respect to a reverse osmosis membrane device having at least two stages, and even when processing raw water having high raw water hardness, a predetermined hardness supply standard can be set without installing a water softener. An object of the present invention is to provide a pure water production system for pharmaceutical production that can be filled and sterilized by passing hot water through the entire system.

  In order to achieve the above object, first, the present invention comprises a pure water production line for producing pure water through raw water in a raw water tank through a first-stage reverse osmosis membrane device and a second-stage reverse osmosis membrane device. A bypass line capable of bypassing the first-stage reverse osmosis membrane device and supplying the raw water to the second-stage reverse osmosis membrane device, and the second on the bypass line via the bypass line A bypass control valve for controlling the inflow of raw water to the stage reverse osmosis membrane device, and on the pure water production line, downstream from the first stage reverse osmosis membrane device and from the bypass line to the pure water production line Provided is a pure water production system comprising a first-stage treated moisture channel connected to the pure water production line at a position upstream from a position where raw water is supplied (Invention 1). In addition, in this specification, the branch part of a bypass line and a pure water manufacturing line is also contained in "on a bypass line."

  According to this invention (invention 1), the structure which supplies raw | natural water in parallel to a 1st stage reverse osmosis membrane apparatus and a 2nd stage reverse osmosis membrane apparatus by opening and closing of a bypass control valve, and a 1st stage reverse osmosis membrane apparatus And the second stage reverse osmosis membrane device can be switched between the configurations connected in series. As a result, at the time of hot water sterilization, by setting these reverse osmosis membrane devices in parallel configuration, the first stage reverse osmosis membrane device And the second stage reverse osmosis membrane device can supply hot water at the same time, and all or part of the treated water of the first stage reverse osmosis membrane device escapes to the first stage treated moisture flow path, It becomes possible to supply hot water to the two-stage reverse osmosis membrane device without increasing the membrane differential pressure. Compared to the case where only one reverse osmosis membrane device is provided by the serial configuration when producing pure water. The hardness is further reduced and total organic carbon [TOC] contained in raw water is formed. Improvement of the removal rate of can also be reduced.

  In the said invention (invention 1), it is further provided with the raw | natural water tank which stores the said raw | natural water upstream from the said 1st stage reverse osmosis membrane apparatus, and the said 1st stage | paragraph process water flow path is connected to the said raw | natural water tank. It is preferable that one circulation line is included (Invention 2).

  According to this invention (invention 2), it becomes the structure which can return the treated water of a 1st stage reverse osmosis membrane apparatus to a raw | natural water tank through a 1st circulation line. Thereby, hot water can be reused at the time of hot water sterilization. Furthermore, the pure water produced through the first-stage reverse osmosis membrane device is returned to the raw water tank via the first circulation line to produce pure water by returning the water having a higher TOC component removal rate and lower hardness through the first circulation line. It can be used for circulating hot water sterilization in water production lines. Thereby, precipitation of the hardness component by heating can be prevented.

  In the said invention (1,2), on the said pure water production line, the position where the said 1st stage process water flow path is connected, and the position which supplies the said raw water to the said pure water production line from the said bypass line, It is preferable that a series-connected flow path valve is provided between them (Invention 3).

  According to this invention (Invention 3), during the production of pure water, the supply of raw water to the bypass line is shut off by closing the bypass control valve, and the pure water production line is released by opening the series connection flow path valve. While the treated water of the first-stage reverse osmosis membrane device can be sent to the second-stage reverse osmosis membrane device, hot water is supplied to the bypass line by opening the bypass control valve at the time of hot water sterilization, By controlling the flow of water supplied to the second-stage reverse osmosis membrane device through the osmosis membrane device with a series-connected flow path valve, the membrane differential pressure and the inlet pressure of the second-stage reverse osmosis membrane device can be more precisely set. It becomes possible to control.

  In the said invention (invention 1-3), it further has the raw | natural water tank which stores the said raw water upstream from the said 1st stage reverse osmosis membrane apparatus, The concentrated water of the said 1st stage reverse osmosis membrane apparatus is added to the said raw | natural water tank. It is preferable to have a second circulation line that can be returned (invention 4).

  According to this invention (invention 4), the amount of water used can be reduced by returning the concentrated water of the first-stage reverse osmosis membrane device to the raw water tank through the second circulation line during the hot water sterilization.

  In the said invention (invention 1-4), it is preferable to provide the electrodeionization apparatus which supplies the treated water of the said 2nd stage reverse osmosis membrane apparatus (invention 5).

  According to this invention (invention 5), it is possible to produce pure water having extremely low hardness that has passed through an electrodeionization apparatus.

  In the said invention (invention 5), the 3rd circulation which is further provided with the raw | natural water tank which stores the said raw | natural water upstream in the said 1st stage reverse osmosis membrane apparatus, and returns the treated water of the said electrodeionization apparatus to the said raw | natural water tank It is preferable to have a line (Invention 6).

  According to this invention (invention 6), the treated water of the electrodeionization apparatus can be returned from the third circulation line to the raw water tank, and the water whose water quality has been remarkably improved can be used for hot water sterilization. Precipitation of hardness components due to heating during sterilization can be prevented.

  In the said invention (invention 4), it is preferable that the discharge flow path which discharges the concentrated water of the said 1st stage reverse osmosis membrane apparatus is connected to the said 2nd circulation line (invention 7).

  According to this invention (Invention 7), when it is necessary to improve the water quality such as the hardness of the water returned to the raw water tank by the second circulation line, the concentrated water of the first-stage reverse osmosis membrane device is appropriately discharged. Therefore, it is possible to perform hot water sterilization (including circulating hot water sterilization) and pure water production of the entire system with water having improved water quality.

  According to the present invention, a configuration in which raw water is supplied in parallel to the first stage reverse osmosis membrane device and the second stage reverse osmosis membrane device by opening and closing the bypass control valve, and the first stage reverse osmosis membrane device and the second stage As a result of switching the configuration in which the reverse osmosis membrane device is connected in series, at the time of hot water sterilization, the reverse osmosis membrane device and the second stage are configured by arranging these reverse osmosis membrane devices in parallel. Hot water can be supplied to the reverse osmosis membrane device at the same time, and all or part of the treated water in the first-stage reverse osmosis membrane device escapes to the first-stage treated moisture flow path. It is possible to supply hot water to the two-stage reverse osmosis membrane device without increasing the hardness, and in the production of pure water, by using a series configuration, the hardness is higher than when only one reverse osmosis membrane device is provided. Reduce the rate of removal of total organic carbon [TOC] components contained in raw water It can be also achieved.

It is a typical block diagram for demonstrating the pure water manufacturing system which concerns on the 1st Embodiment of this invention. It is a typical block diagram which shows the flow of the water at the time of the normal water sampling in 1st Embodiment. It is a typical block diagram which shows the flow of the water at the time of the hot water sterilization in 1st Embodiment. It is a typical block diagram for demonstrating the pure water manufacturing system which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows the flow by the two-stage reverse osmosis membrane + electrodeionization apparatus which employ | adopted the switching mechanism of individual sterilization and two-stage water flow. It is a schematic diagram which shows the flow of the pure water manufacturing system for pharmaceutical manufacture by the conventional reverse osmosis membrane + electrodeionization apparatus.

(First embodiment)
Hereinafter, the pure water production system of the present embodiment will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a pure water production system according to the first embodiment of the present invention.

  The pure water production system 1 of the present embodiment is a first-stage reverse osmosis membrane configured by combining raw water supplied from a raw water tank 9 by combining a heater 10, a reverse osmosis membrane water supply pump 8, and two RO vessels in parallel. The apparatus 3 includes a pure water production line 11 capable of producing pure water by sequentially passing through a second-stage reverse osmosis membrane device 5 constituted by one RO vessel and an electrodeionization device 7. The pure water production line 11 bypasses the first-stage reverse osmosis membrane device 3 and joins the pure-water production line 11 on the upstream side of the first-stage reverse osmosis membrane device 3. A bypass line 15 capable of supplying raw water is provided. A bypass control valve 13 capable of closing the flow path is provided at a branch portion between the bypass line 15 and the pure water production line 11. Thereby, the water supplied to the pure water production line 11 is supplied in parallel to the first-stage reverse osmosis membrane device 3 and the second-stage reverse osmosis membrane device 5 when the bypass control valve 13 is opened, and the bypass control valve 13. Is closed, the first-stage reverse osmosis membrane device 3 is supplied to the second-stage reverse osmosis membrane device 5.

  The pure water production system 1 is also located on the pure water production line 11 on the downstream side of the first-stage reverse osmosis membrane device 3 and on the upstream side of the position where raw water is supplied from the bypass line 15 to the pure water production line 11. A first circulation line 17 capable of returning the treated water of the first stage reverse osmosis membrane device 3 to the raw water tank 9 is provided. Moreover, the 2nd circulation line 18 which can return the concentrated water of the 1st stage reverse osmosis membrane apparatus 3 to the raw | natural water tank 9 is provided. With these circulation lines 17 and 18, the concentrated water and / or treated water of the first-stage reverse osmosis membrane device 3 can be returned to the raw water tank.

  In the pure water production system 1, a discharge flow path 20 is connected to the second circulation line 18 in the middle of the flow path. With such a configuration, the concentrated water of the first-stage reverse osmosis membrane device 3 can be discharged.

  The pure water production line 11, the first circulation line 17, the second circulation line 18, and the concentrated water discharge passage 20 of the first-stage reverse osmosis membrane device 3 are each provided with a valve capable of opening and closing the passage. ing. First, the pure water production line 11 is connected in series between the position where the first circulation line 17 is connected on the flow path and the position where raw water is supplied to the pure water production line 11 via the bypass line 15. A connection flow path valve 14 is provided. The first circulation line 17 and the second circulation line 18 are provided with return control valves 19a and 19b for controlling the return of water to the raw water tank 9 on the respective flow paths. Further, the concentrated water discharge passage 20 is provided with a discharge control valve 16.

  As shown in FIG. 1, on the bypass line 15, the distance a1 from the bypass control valve 13 to the position where raw water is supplied to the pure water production line 11, the pure water production line 11, and the first circulation line 17 are branched. The distance a2 from the position to the series connection flow path valve 14, the distance a3 from the series connection flow path valve 14 to the position where the bypass line 15 supplies the raw water to the pure water production line 11 on the pure water production line 11, and the first 2 It is preferable to make the distance a4 from the position where the discharge flow path 20 is connected to the circulation line 18 to the discharge control valve 16 capable of closing the discharge flow path 20 as short as possible, for example, all within 6 times the pipe diameter It is preferable that This makes it easy for hot water to reach the flow path through which hot water does not flow during hot water sterilization, so that the flow path constituting the pure water production system can be sufficiently sterilized.

  In this embodiment, the first-stage reverse osmosis membrane device 3 is configured by combining two RO vessels in parallel, and the second-stage reverse osmosis membrane device 5 is configured by one RO vessel. Both reverse osmosis membrane devices 3 and 5 may be composed of one RO vessel, or may be composed of two or more parallel vessels.

(Function and effect)
FIG. 2 shows the flow of water during normal water sampling (during pure water production) using the pure water production system 1 shown in FIG. In this embodiment, the open / close state of the valve is such that the bypass control valve 13 is closed, the series connection flow path valve 14 is opened, the return control valves 19a and 19b are closed, and the concentrated water discharge valve 16 is opened. As a result, the water to be treated supplied from the raw water tank 9 to the pure water production line 11 passes through the first-stage reverse osmosis membrane device 3 from the reverse osmosis membrane water supply pump 8 and reaches the second-stage reverse osmosis membrane device 5. . That is, the water to be treated is passed through the two-stage reverse osmosis membrane device to the electrodeionization device 7.

  Concentrated water from the first-stage reverse osmosis membrane device 3 is partially discharged through the concentrated water discharge valve 16 through the discharge channel 20 during sampling.

  On the other hand, the concentrated water of the second-stage reverse osmosis membrane device 5 passes through the treated water of the first-stage reverse osmosis membrane device 3 during sampling, so that the ion concentration is low. When the concentrated water is returned to the raw water tank 9 via a fourth circulation line (not shown), the hardness of the water supplied to the first-stage reverse osmosis membrane device 3 is further reduced. Although effective, it may be discharged as waste water. However, at the time of heat sterilization, it is preferable to return the entire amount to the raw water tank 9 in order to save water.

  FIG. 3 shows the flow of water during hot water sterilization. In this embodiment, the open / closed state of the valve is that the bypass control valve 13 is opened, the series connection flow path valve 14 is closed, the return control valves 19a and 19b are opened, and the concentrated water discharge valve 16 is closed. Thereby, the hot water heated by the heater 10 (for example, 65 ° C. to 85 ° C.) is supplied to the pure water production line 11 by the reverse osmosis membrane water supply pump 8 at the upstream branch portion of the first stage reverse osmosis membrane device 3. And the bypass line are divided and supplied in two directions, and hot water can be supplied simultaneously. This means that it is not necessary to pass the permeated water of the first-stage reverse osmosis membrane device 3 as hot water to the second-stage reverse osmosis membrane device, and during the hot water sterilization, the first-stage reverse osmosis membrane device It is possible to pass water through the reverse osmosis membrane devices 3 and 5 without increasing the inlet pressure of 3.

  The concentrated water of the first-stage reverse osmosis membrane device 3 is configured to be returned to the raw water tank 9 and used again as hot water during hot water sterilization. This reduces the amount of water used and suppresses energy consumption required for heating the water. The concentrated water of the first-stage reverse osmosis membrane device 3 may be drained from the return control valve 19b without being returned to the raw water tank 9. In that case, the amount of water used during hot water sterilization increases, but whether or not to return the concentrated water to the raw water tank 9 can be determined appropriately according to the hardness of the water used for hot water sterilization, water quality such as TOC, etc. Good.

  In addition, the concentrated water of the second-stage reverse osmosis membrane device 5 passes the treated water of the first-stage reverse osmosis membrane device 3 even during hot water sterilization as in the above-described sampling, so the ion concentration is low, Usually, it is returned to the raw water tank 9. By adjusting the back pressure on the returning side, the amount of water supplied to the electrodeionization device 7 and the supply water pressure can be adjusted during the hot water sterilization.

(Second Embodiment-Modification)
In the first embodiment, since the water softener is excluded, the raw water which is the water to be treated is filled in the pipes before the reverse osmosis membrane devices 3 and 5 before the start of the hot water sterilization. Especially, the hardness component is relatively high. If hot water sterilization is started as it is, depending on the hardness of the raw water, the calcium component of the hardness component may easily precipitate due to a temperature drop. Therefore, the second embodiment shown in FIG. 4 includes a third circulation line 21 connected to the pure water production line 11 on the downstream side of the electrodeionization apparatus 7. Thereby, before starting the hot water sterilization, the treated water of the electrodeionization apparatus 7 is returned to the raw water tank 9 and circulated to gradually reduce the ion concentration in the system, and then the hot water sterilization is started. Even if the hardness of the raw water is high, precipitation of hardness components due to heating can be prevented.

  In the first embodiment, the first circulation line 17 is provided as one aspect of the first-stage treated moisture flow path. However, in the second embodiment, the first stage treated moisture flow path is defined as one aspect of the first-stage treated moisture flow path. Instead of the first circulation line 17, a first-stage treated water discharge path 170 is provided that can discharge all or part of the treated water of the first-stage reverse osmosis membrane device as it is. With such a configuration, when the bypass control valve is opened at the time of hot water sterilization, there is no water passed through the second-stage reverse osmosis membrane device out of the treated water of the first-stage reverse osmosis membrane device. Alternatively, even if water is passed, the amount is small, so that hot water can be supplied to each of the two-stage reverse osmosis membrane devices without increasing the membrane differential pressure or the inlet pressure.

  In the first embodiment, the bypass line 15 and the pure water production line 11 are merged on the upstream side of the second-stage reverse osmosis membrane device 5, but are not necessarily merged. In the second embodiment, the second-stage reverse osmosis membrane device 5 is separately connected as shown in FIG.

  In the second embodiment, as shown in FIG. 4, a three-way valve as a bypass control valve 13 is provided at a branch point between the pure water production line 11 and the bypass line 15.

  In the second embodiment, the serially connected flow path valve 14 includes a position where the first-stage treated water flow path (first-stage treated water discharge path 170) branches on the pure water production line 11, and the bypass line 15. Return control valve 19a in the first embodiment is not at a position where raw water is supplied from but at a position where pure water production line 11 and first stage treated water discharge path 170 are connected as shown in FIG. It is provided as a three-way valve that has both functions.

  In the first embodiment, the concentrated water discharge valve 16 and the return control valve 19b are provided on different flow paths, that is, the discharge flow path and the first circulation line 17, but in the second embodiment, As shown in FIG. 4, without providing the discharge flow path 20, both the concentrated water discharge valve 16 and the return control valve 19b are provided on the flow path of the first circulation line 17 as an on-off valve. In FIG. 4, the concentrated water discharge valve 16 is arranged on the upstream side of the first circulation line, that is, on the side closer to the pure water production line 11 as compared with the return control valve 19b. It may be arranged upstream of one circulation line.

  The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, the bypass control valve 13, the serial connection flow path valve 14, the concentrated water discharge valve 16, and the return control valves 19a and 19b may be automatic valves or manual valves, but the automatic valve operates more. Easy to manage. At least some of these valves may or may not be associated with the opening / closing of the flow path and the amount of water passing through each valve. Further, in addition to the above five valves, for example, the valve may be provided on the third circulation line 21, or when the fourth circulation line is provided, the valve may be provided on the fourth circulation line.

  The reverse osmosis membrane supply pump 8 may be adjusted by restricting the valve at the pump outlet. However, the reverse osmosis membrane supply pressure is controlled in conjunction with a pressure gauge or the like by adding rotation control of an inverter or the like. Is also possible.

  The following specific examples further illustrate the present invention. FIG. 5 is a block diagram of a two-stage reverse osmosis membrane + electrodeionization apparatus that employs a switching mechanism between individual sterilization and two-stage water flow used as an example. FIG. 6 is a block diagram of a pure water production system 100 for pharmaceutical production using a conventional reverse osmosis membrane + electrode deionization apparatus used as a comparative example. 5 and 6, the raw water tanks 9 and 109 are sequentially passed through the water pumps 2 and 102, the heaters 10 and 110, and the activated carbon filters 4 and 104 (Crycol AW, manufactured by Kurita Kogyo Co., Ltd.) in order. Although it is the same structure until it supplies to the osmosis membrane high-pressure supply pumps 8 and 108, after that, the pure water manufacturing system 1 of an Example has two RO modules (HSRO-390, the product made by Dow Chemical Japan) in parallel. Via the first-stage reverse osmosis membrane device 3 configured and the second-stage reverse osmosis membrane device 5 having the second-stage reverse osmosis membrane device 5 configured in parallel with two RO modules, the electrodeionization device 7 (KCDI) -LX type (manufactured by Kurita Kogyo Co., Ltd.), and in the pure water production apparatus 100 of the comparative example, only one stage of the reverse osmosis membrane apparatus 106 in which the above two modules are arranged in parallel is used, Ion equipment 07 was configured to be passed through. In Examples and Comparative Examples, experiments were performed using the apparatuses shown in FIGS. 5 and 6 under the conditions shown in Table 1 below.

  Water quality and calcium hardness at the inlet and outlet of the reverse osmosis membrane device, TOC, water quality at the electrodeionization device outlet, city water, activated carbon inlet, activated charcoal outlet, reverse osmosis membrane device outlet, and general points at the electrodeionization device outlet The number of bacteria was measured by a culture method using an R2A agar medium, and the number of general bacteria was measured before sterilization and once every 10 days.

  In both the comparative example and the example, the number of general bacteria before hot water sterilization before starting the test was measured, and the temperature from the raw water tank to the electrodeionization device was gradually raised with a heater, and the whole system reached 82 ° C. The hot water was sterilized by a circulation system that was held for 30 minutes. The examples were sterilized with hot water by the water flow method described in the embodiment of the invention. The operation period was one month. Table 2 shows the water quality of each RO and electrodeionization in the comparative example and the example.

In this test, since the total hardness of raw water of city water, which is the treated water, was as low as 32 mg / L as CaCO ₃ , the water softener was not provided. As a result, in the comparative example, the calcium hardness of the RO-treated water was 0.4 mg / L, which is close to 0.5 mg / L, which is the supply limit of the electrodeionization apparatus, but in the example, 0.1 mg / L was sufficient. The supply with was possible. Moreover, in the Example, it turned out that 90% of RO supply water can be removed by making TOC in RO exit into two-stage RO.

(Bactericidal effect confirmation test results)
The general bacterial count behavior in the comparative example is shown in Table 3, and the general bacterial count behavior in the example is shown in Table 4.

  Tables 3 and 4 show the results of the number of general bacteria at each point of city water, activated carbon inlet, activated carbon outlet, reverse osmosis membrane device outlet, and electrodeionization device outlet in Comparative Examples and Examples. As for the number of general bacteria, the sterilization effect was obtained at all points immediately after the hot water sterilization in the operation for one month which is the test period. Subsequent operation showed an increase in the number of general bacteria at each point as the number of viable bacteria increased at the outlet of the activated carbon. However, it was found that the number of general bacteria was reduced in both systems by sterilization with hot water. Moreover, it turned out that the Example which set it as 2 step | paragraph RO has few general bacteria numbers in RO exit compared with the comparative example which passes only through 1 step | paragraph RO. This can be presumed to be the result of the membrane being blocked by passing water through the reverse osmosis membrane device in two stages. From this, it was determined that the hot water sterilization was sufficiently performed even with the apparatus configuration of the example.

  The pure water production system of the present invention is useful for producing purified water for pharmaceutical production.

DESCRIPTION OF SYMBOLS 1 ... Pure water production system 2, 102 ... Water pump 3 ... 1st stage reverse osmosis membrane apparatus 4,104 ... Activated carbon filtration membrane 5 ... 2nd stage reverse osmosis membrane apparatus 7,107 ... Electrodeionization apparatus 8,108 ... Reverse Osmotic membrane water supply pumps 9, 109 ... Raw water tanks 10, 110 ... Heater 11 ... Pure water production line 13 ... Bypass control valve 14 ... Series connection flow path valve 15 ... Bypass line 16 ... Concentrated water discharge valve 17 ... First stage treatment Moisture channel (first circulation line)
18 ... 2nd circulation line 19a, 19b ... Return control valve 20 ... Concentrated water discharge flow path 21 ... 3rd circulation line 100 ... Pure water manufacturing apparatus 106 ... Reverse osmosis membrane

Claims (6)

A system comprising a pure water production line for producing pure water by sequentially passing raw water through a first-stage reverse osmosis membrane device and a second-stage reverse osmosis membrane device,
A bypass line capable of bypassing the first-stage reverse osmosis membrane device and supplying the raw water to the second-stage reverse osmosis membrane device;
A bypass control valve that controls the water inlet of the second stage reverse osmosis membrane apparatus through the bypass line on the bypass line,
Connected to the pure water production line on the pure water production line at a position downstream from the first-stage reverse osmosis membrane device and upstream from a position where the raw water is supplied from the bypass line to the pure water production line A first-stage treated water flow path ,
Series connection flow path valve provided between the position where the first stage treated water flow path is connected on the pure water production line and the position where the raw water is supplied from the bypass line to the pure water production line And
A heater provided on the upstream side of the first-stage reverse osmosis membrane device on the pure water production line ,
At the time of hot water sterilization, the raw water is supplied in parallel to the first-stage reverse osmosis membrane device and the second-stage reverse osmosis membrane device by opening the bypass control valve and the series connection flow path valve,
When pure water is produced, the raw water is supplied in series to the first-stage reverse osmosis membrane device and the second-stage reverse osmosis membrane device by closing the bypass control valve and opening the series connection flow path valve. age,
A pure water production system capable of switching between a configuration during the hot water sterilization and a configuration during the production of the pure water. Furthermore, a raw water tank for storing the raw water upstream of the first-stage reverse osmosis membrane device is provided,
The pure water manufacturing system according to claim 1, wherein the first-stage treated water flow path includes a first circulation line connected to the raw water tank. Furthermore, a raw water tank for storing the raw water upstream of the first-stage reverse osmosis membrane device is provided,
The pure water production system according to claim 1 , further comprising a second circulation line capable of returning the concentrated water of the first-stage reverse osmosis membrane device to the raw water tank. The pure water manufacturing system as described in any one of Claims 1-3 provided with the electrodeionization apparatus which supplies the treated water of the said 2nd stage reverse osmosis membrane apparatus. Furthermore, a raw water tank for storing the raw water upstream of the first-stage reverse osmosis membrane device is provided,
The pure water manufacturing system of Claim 4 provided with the 3rd circulation line which returns the treated water of the said electrodeionization apparatus to the said raw | natural water tank. The pure water manufacturing system according to claim 3 , wherein a discharge flow path for discharging concentrated water of the first-stage reverse osmosis membrane device is connected to the second circulation line.

Images