JP2007136384A - Permeated water manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permeated water manufacturing apparatus which can effectively utilize thickened water of a reverse osmosis membrane. <P>SOLUTION: A pipeline 70 connects a water feeding tank 20, a filter unit 30 housing an active carbon filter 34 and a reverse osmosis membrane filter 36, a pump 40 for supplying water from the water feeding tank 20 to the filter unit 30 at predetermined pressure, a permeated water storing tank 50 for storing permeated water obtained by permeation through the filter unit 30, a water intake port for taking out the permeated water from the permeated water storing tank 50 and a waste water storing tank 60 for storing thickened water in the filter unit. Further a bypass route 72 for circulating the thickened water in the filter unit to the pump 40 is provided at the pipeline 70. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a permeated water producing apparatus, and more particularly to a permeated water producing apparatus capable of supplying permeated water at low cost and hygiene.

  The manufacture of permeated water from which impurities are highly removed includes a method obtained by allowing tap water to permeate through a filter material and a reverse osmosis membrane, and is generally widely known as a permeated water manufacturing apparatus. Thus, by using a reverse osmosis membrane as a part of the filter material, water close to purified water (hereinafter referred to as permeated water) that has been purified until impurities are extremely reduced can be obtained. It is said that drinks and foods can be provided deliciously by using water with very few impurities such as permeated water.

Such a permeated water production apparatus using a reverse osmosis membrane enables high removal of impurities, but increases the amount of wasted water and increases the time for passing through the reverse osmosis membrane. turn into. Specifically, about 4 times the raw water to be obtained must be supplied to the reverse osmosis membrane, and it takes several hours for all the raw water to pass through the reverse osmosis membrane. An example of a permeated water production apparatus that has been improved to supplement the processing capability of such a reverse osmosis membrane is disclosed in Patent Document 1. The desalination apparatus using a reverse osmosis membrane described in Patent Document 1 obtains permeated water using a plurality of reverse osmosis membrane apparatuses, and switches the flow path depending on the temperature of water passing through the reverse osmosis membrane. It is. As a result, a necessary amount of permeate can be obtained, and constant permeate can be obtained regardless of the temperature of the water used.
JP-A-6-15270

In the fresh water generator by the reverse osmosis membrane shown by the cited reference 1, since it has a some reverse osmosis membrane apparatus, there exists a subject that a fresh water generator will become large sized and expensive.
Moreover, in each reverse osmosis membrane apparatus, the water which did not permeate | transmit a reverse osmosis membrane is disposed after being collect | recovered as concentrated water. If treated water such as seawater or brine is allowed to pass through the reverse osmosis membrane, it can be said that the form of collecting concentrated water like the fresh water generator described in Cited Document 1 is a preferable form. However, since the raw water for allowing the reverse osmosis membrane to permeate in ordinary homes and offices is tap water and has already been purified to a drinkable level, concentrated water that has not permeated the reverse osmosis membrane is used each time. It is not economically preferable to recover, and there is a problem that the treatment of waste water is complicated.

  Therefore, the present invention provides a permeated water production apparatus that can effectively use concentrated water instead of collecting and disposing of concentrated water each time in a permeated water production apparatus that supplies water from a water supply to a reverse osmosis membrane. The purpose is to provide.

  The present invention provides a water supply tank, a filter unit in which a reverse osmosis membrane filter and a pretreatment filter are housed, a pump for supplying water from the water supply tank to the filter unit at a predetermined pressure, and a filter unit that allows the filter unit to pass therethrough. A permeated water storage tank for storing the permeated water obtained in the above, a water intake port for extracting the permeated water from the permeated water storage tank, and a waste water storage tank for storing the concentrated water in the filter unit. The passage is provided with a bypass passage for circulating the concentrated water in the filter unit to the pump.

Further, the bypass passage is provided with a flow rate adjusting mechanism.
As a result, the amount of concentrated water to be circulated to the pipe line upstream of the filter unit can be changed as appropriate according to the state of the reverse osmosis membrane and the state of the water supply, thereby reducing the labor of drainage and more economical. Permeate water can be produced.

Further, the pressure switch for measuring the internal pressure of the permeate water storage tank and the pump and the flow rate adjusting mechanism based on the measured value of the pressure switch so that the permeate water storage tank is always filled with permeate. It has the control means which controls each operation | movement, It is characterized by the above-mentioned.
Thereby, since the permeated water storage tank is always filled with permeated water, contact with air can be blocked and permeated water can be stored under favorable conditions.

The bypass channel includes a concentrated water disposal channel connected to the waste water storage tank, and a concentrated water to the concentrated water disposal channel according to an increase or decrease in the circulating flow rate of the concentrated water by the flow rate adjusting mechanism. It is characterized in that a flow rate adjusting valve for adjusting the inflow amount is provided.
Thereby, the recycled amount of concentrated water can be set suitably, and the balance of the quality of permeated water and disposal of concentrated water can be maintained suitably.

The pretreatment filter may be a fibrous activated carbon filter, a granular activated carbon filter, and a polypropylene filter arranged in this order.
Thereby, impurities mixed into the reverse osmosis membrane can be greatly reduced, and the life of the reverse osmosis membrane can be greatly extended.

In addition, a post-treatment activated carbon filter is disposed between the permeate storage tank and the water intake.
Thereby, since the smell of the reverse osmosis membrane adhering to the permeated water can be removed, it is possible to produce a permeated water that is tasteless and odorless and easy to use.

In addition, a foreign matter mixing prevention filter is disposed in front of the pump.
Thereby, foreign matter mixing into the pump can be eliminated, and damage to the pump can be prevented.

  According to the permeated water production apparatus of the present invention, all or part of the concentrated water can be circulated to the upstream pipe line immediately after the filter unit, so that the concentrated water can be recycled and the concentrated water is discarded. This saves you time and effort. Therefore, the maintenance of the permeated water production machine becomes very simple and the permeated water can be provided at a low cost.

The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing the internal structure of the permeated water production apparatus according to the present embodiment.
The permeated water production apparatus 10 according to the present embodiment includes a water supply tank 20, a pretreatment filter 34 including an activated carbon filter 32 and a polypropylene filter 33, a filter unit 30 in which a reverse osmosis membrane filter 36 is accommodated, and water supply A pump 40 that supplies water taken out from the tank 20 to the filter unit 30 at a predetermined pressure, a permeated water storage tank 50 that stores permeated water obtained by permeating the filter unit 30, concentrated water in the filter unit 30, and Waste water storage tanks 60 for storing old permeated water are accommodated in the housing 12 in a state where they are connected by pipe lines 70. A check valve 80 and a solenoid valve 82 are respectively provided in the pipeline 70 at required locations, and a flow path of water flowing through the pipeline 70 is appropriately set. A bypass path 72 for circulating a part of the concentrated water in the filter unit 30 to the pump 40 is provided at the rear end of the filter unit 30. A flow rate adjusting valve 84 serving as a flow rate adjusting mechanism is disposed in the bypass path 72. Further, water intakes (56a, 58a, 59) for taking out permeated water stored in the permeated water storage tank 50 are provided on the front surface of the housing 12.

  The water supply tank 20 is a completely sealed resin tank, and is detachably disposed on the housing 12 in a state where two water tanks are arranged in the horizontal direction on the top of the housing 12. The water in the water supply tank 20 flows down to the pipe line 70 by natural flow and is supplied to the pump 40 after passing through the check valve 80a, the electromagnetic valve 82a and the foreign matter mixing prevention filter 38, respectively. The electromagnetic valve 82a is opened and closed by a control means (not shown) so that it opens only while the water in the conduit 70 is flowing down and is closed when there is no water flow.

  The filter unit 30 is configured by connecting a plurality of types of activated carbon filters 32 and polypropylene filters 33 and a reverse osmosis membrane filter 36 made of a reverse osmosis membrane in series. The activated carbon filter 32 includes a fibrous activated carbon filter 32a formed of fibers containing activated carbon and a granular activated carbon filter 32b formed of granular activated carbon. In this way, the raw water is purified by the activated carbon by passing the raw water through the plural types of activated carbon filters 32a and 32b. Moreover, since the granular activated carbon filter 32b can remove reliably the fiber thing mixed when passing through the fibrous activated carbon filter, filtration of each filter (especially reverse osmosis membrane filter 36) at the time of subsequent filtering is performed. This is advantageous because the lifetime can be greatly extended.

  A water intake 30a, a permeate outlet 30b, and a concentrated water outlet 30c are provided on the outer surface of the filter unit 30. The water intake 30a, the permeate outlet 30b, and the concentrated water outlet 30c are each formed in a plug shape into which a flexible tube can be inserted, so that the filter unit 30 can be connected to the middle of the pipe line 70 by a one-touch operation. Is formed.

  One end side of the bypass path 72 is connected to the concentrated water outlet 30c. The other end side of the bypass path 72 is connected to a pipe line 70 upstream of the water intake port of the pump 40. A flow rate adjustment valve 84 is provided in the middle of the bypass path 72. The opening / closing operation of the flow rate adjusting valve 84 is also controlled by the control means based on a control program incorporated in advance in a storage means (not shown).

  A permeate storage tank 50 that stores permeate obtained by passing the filter unit 30 is connected to the downstream side of the permeate outlet 30b. The permeated water storage tank 50 is fixed in the internal space of the housing 12. The permeated water storage tank 50 is provided with a pressure switch 52. The internal pressure value of the permeate storage tank 50 measured by the pressure switch 52 is transmitted to a control means (not shown). Based on the received measurement value of the internal pressure of the permeated water storage tank 50, the control means is arranged on / off of the switch of the pump 40 and in various places of the pipe line 70 based on a control program incorporated in advance in the storage means (not shown). Control is performed to switch the open / close state of the solenoid valve 82 provided.

  A post-treatment activated carbon filter 54, a check valve 80 c and an ultraviolet irradiator 55 are disposed downstream of the permeate storage tank 50. The water in the permeated water storage tank 50 may have a resin odor due to the reverse osmosis membrane filter 36 even though the water passes through the reverse osmosis membrane filter 36. Therefore, the permeated water from the permeated water storage tank 50 is deodorized by the post-treatment activated carbon filter 54, and then passes through the check valve 80 c and is irradiated with ultraviolet rays by the ultraviolet irradiator 55, which is a sterilizing means. And supplied to the cold water tank 58.

A hot water intake port 56a and a cold water intake port 58a, and air vent valves 56b and 58b are attached to the hot water tank 56 and the cold water tank 58, respectively. Further, a room temperature water intake 59 a is provided between the ultraviolet irradiator 55 and the cold water tank 58. Each of the hot water intake 56a, the cold water intake 58a, and the room temperature water intake 59a is configured by an electromagnetic valve.
A heating means 56 c such as an electric heater is disposed on the outer periphery of the hot water tank 56. On the other hand, a cooling means 58c such as a refrigerant pipe and a compressor is disposed on the outer periphery of the cold water tank 58. The heating means 56c and the cooling means 58c are not limited to the heating means 56c and the cooling means 58c described above, and other means such as a Peltier element or a planar heating element can be appropriately selected and used. . The temperature management of the tanks 56 and 58 is controlled by the thermistor S and control means provided in the tanks 56 and 58.
Furthermore, drain ports 56d and 58d are provided in the hot water tank 56 and the cold water tank 58, respectively.

  The control means operates the pump 40 and the check valve 80 to produce permeated water, and fills the hot water tank 56, the cold water tank 58, and the permeated water storage tank 50 with the permeated water. Since the hot water tank 56 and the cold water tank 58 are provided with air vent valves 56b and 58b, the pressure in the tank does not rise until the permeated water is filled in the respective tanks 56 and 58. When the inside of each tank is filled with permeated water, the pressure propagates to the pipe line 70. The pressure thus propagated is detected by a pressure switch 52b disposed between the ultraviolet irradiator 55, the hot water tank 56, and the cold water tank 58. A pressure detection signal from the pressure switch 52b is transmitted to the control means. When the pressure value of the pressure detection signal transmitted from the pressure switch 52b reaches a preset value, the control means performs control to stop the operation of the pump 40 and the check valve 80.

  In addition, the control means monitors the operation history of the electromagnetic valves constituting the water intake ports 56a, 58a, 59a, and if the operation of the electromagnetic valves is not detected for a predetermined time, the control means determines whether the discharge ports 56d, The permeated water in the hot water tank 56 and the permeated water in the cold water tank 58 are forcibly discharged from 58d over a required time, and are stored in the wastewater storage tank 60 connected downstream.

  The waste water storage tank 60 is provided with a float switch 62 and a limit switch 64. When the amount of waste water stored in the waste water storage tank 60 reaches a predetermined amount, the float switch 62 is activated to transmit a signal to the control means. The control means that has received the transmission signal from the float switch 62 issues a warning to the user to discard the wastewater by a display means (not shown) and stops the wastewater storage in the wastewater storage tank 60. Further, when the user removes the waste water storage tank 60 by receiving a warning or the like, the limit switch 64 is activated and an operation signal is transmitted to the control means. The control means that has received the operation signal issues a warning by the display means and stops the wastewater storage in the wastewater storage tank 60.

  Moreover, the inner bottom part of the housing | casing 12 is formed in the funnel shape, and the water leak detection sensor 14 is arrange | positioned in the inner bottom part of the funnel-shaped part. When the water leakage detection sensor 14 detects water leakage, a water leakage detection signal is transmitted to the control means, and the control means that has received the water leakage detection signal issues a warning by the display means and urgently stops the operation of the permeated water production apparatus 10.

The permeated water production apparatus 10 in the present embodiment has the configuration described above. Below, the processing procedure of the water by the permeated water manufacturing apparatus 10 in this Embodiment is demonstrated in detail.
The water in the water supply tank 20 is supplied by natural flow to the pump 40 by controlling the opening / closing operation of the check valve 80 by the control means. The water supplied to the pump 40 is pressurized to about 200 to 300 KPa and sent to the filter unit 30. In the pressurized water, rough impurities such as scale and dust are filtered by the fibrous activated carbon filter 32a and the granular activated carbon filter 32b. Subsequently, a pre-filtration process is performed with the polypropylene filter 33, followed by a filtration process with the reverse osmosis membrane filter 36. The reverse osmosis membrane filter 36 is a filter material having fine pores of 0.0001 microns, and has viruses (sizes of about 0.02 to 0.04 microns) and bacteria (sizes of about 0.4 microns to 1 micron). ) Can be collected. The water supplied to the reverse osmosis membrane filter 36 is filtered at the molecular level. As described above, since the water supplied to the filter unit 30 is pressurized to about 200 to 300 KPa, even if the reverse osmosis membrane filter 36 has a low permeation rate, the required permeated water can be supplied for a short time. Can get to.

  The permeated water thus obtained is fed from the permeated water outlet 30b of the filter unit 30 to the permeated water storage tank 50, the hot water tank 56, and the cold water tank 58. The permeated water passes through the check valve 80a, then passes through the post-treatment activated carbon filter 54 for removing the resin odor adhering to the reverse osmosis membrane filter 36 and the ultraviolet irradiator 55, and then the hot water tank 56 or the cold water tank. 58 is stored. Since the hot water tank 56 and the cold water tank 58 are provided with air vent valves 56b, 58b, the permeated water is supplied until the hot water tank 56 and the cold water tank 58 are full. When the hot water tank 56 and the cold water tank 58 are full, the hot water tank 56 and the cold water tank 58 are in an equilibrium state, so that the permeate storage is delayed and the permeate storage tank 50 stores the permeate. Become.

  As described above, pressure switches 52 a and 52 b are provided in the permeated water storage tank 50 main body and the conduit 70 between the permeated water storage tank 50, the hot water tank 56, and the cold water tank 58. The pressure signal at each position measured by the pressure switch 52 is transmitted to a control means such as a CPU. The control means supplies power to the pump 40 until the internal pressure of the permeated water storage tank 50, the hot water tank 56, and the cold water tank 58 reaches a required pressure based on the transmitted pressure signal and the control program. Each check valve 80, electromagnetic valve 82, and flow rate adjusting valve 84 are controlled to open and close to continuously generate permeated water.

  Thus, the hot water tank 56, the cold water tank 58, and the permeated water storage tank 50 are in a state of being pressurized by the pump 40. Accordingly, when the user takes out the permeated water from the water intakes 56a, 58a, 59, the internal pressure of the hot water tank 56 and the cold water tank 58 is lowered, so that the permeated water storage tank 50 automatically changes to the hot water tank 56 or the cold water tank 58. Permeated water is supplied to. At the same time, the internal pressure drop in the permeate storage tank 50 is measured by the pressure switch 52, and a measurement signal is transmitted to the control means. The control means operates the pump 40 based on the measurement signal, and opens each check valve 80 and the electromagnetic valve 82 to supply the permeated water to the permeated water storage tank 50. When the permeated water storage tank 50 is full, the control means stops the operation of the pump 40 and the electromagnetic valve 82 and stops the production of the permeated water.

The hot water tank 56 and the cold water tank 58 are connected to a waste water storage tank 60 through intake ports 56d and 58d. When the permeated water stored in the hot water tank 56 and the cold water tank 58 is left for a predetermined time, the control means forcibly discharges the permeated water from the water intake ports 56d and 58d, and the waste water storage tank. The permeated water that has become old in 60 is discarded.
When the float switch 62 of the waste water storage tank 60 detects that the amount of water in the waste water storage tank 60 is full or close to full, a full water signal is transmitted to the control means. When the control unit receives the full water signal, the control unit warns the user of full water from a display unit (not shown) or the display unit and the audio output unit. When a warning of full water is given from the display unit or the display unit and the audio output unit, the user removes the waste water storage tank 60 and appropriately processes the stored waste water. When the wastewater storage tank 60 is removed, the limit switch 64 disposed at the lower part of the wastewater storage tank 60 is activated, and the operation of the permeated water production apparatus 10 is temporarily stopped. Even when the warning is issued, the control means 10 temporarily stops the operation of the permeated water production apparatus 10 even when the wastewater storage tank 60 is not removed.

  Next, the concentrated water stored in the filter unit 30 will be described. The filter unit 30 includes a reverse osmosis membrane filter 36 having low permeability. The reverse osmosis membrane filter 36 allows one-quarter of the supplied raw water to pass as permeated water. That is, three-quarters of the supplied water remains in the reverse osmosis membrane filter 36. Thus, the water remaining in the reverse osmosis membrane filter 36 is generally called concentrated water. Such concentrated water is basically often treated as waste water.

However, the concentrated water in the permeated water production apparatus 10 according to the present embodiment has already been permeated through the plurality of activated carbon filters 32 and polypropylene filters 33 and has been sufficiently purified. Since it is useless to drain the purified water in this manner, the concentrated water remaining in the reverse osmosis membrane filter 36 can be used effectively.
Specifically, it has a bypass path 72 connected to the concentrated water intake 30 c and a pipe line 70 upstream from the intake port of the pump 40, and circulates the concentrated water accumulated in the reverse osmosis membrane filter 36 to the filter unit 30. It is possible. A flow rate adjusting valve 84 that adjusts the flow rate of the concentrated water is disposed in the middle of the bypass path 72.

The concentrated water remaining in the reverse osmosis membrane filter 36 is mixed with untreated water from the water supply tank 20 and then supplied to the filter unit 30 again with a predetermined pressure applied by the pump 40. become.
Thus, since the concentrated water is mixed with the untreated water from the water supply tank 20 and supplied to the filter unit 30, the burden on the activated carbon filter 32 and the polypropylene filter 33 in the filter unit 30 can be reduced. .

The flow rate adjustment of the concentrated water by the flow rate adjustment valve 84 is controlled based on a control program stored in a storage unit (not shown) by the control unit. The control program can be appropriately set according to the amount of permeated water used in one day in addition to the cleaning treatment of the reverse osmosis membrane filter 36 and the storage rate of the wastewater storage tank 60, and can of course be customized. .
In addition, even when the control unit displays the full water for the user, when the concentrated water in the waste water storage tank 60 is not processed, the control unit automatically causes all the water in the filter unit 30 to flow into the bypass path 72. It is also possible to control the flow rate adjusting valve 84 as described above.

Furthermore, when the filter unit 30 is replaced, all of the check valves 80 and the flow rate adjusting valves 84 are set to be openable or closed by the control means. If one end of the pipe 70 is connected to the wastewater storage tank 60, all the water in the pipe 70 flows into the wastewater storage tank 60 when the check valve 80 and the flow rate adjustment valve 84 are opened. Therefore, the filter unit 30 can be easily replaced.
Further, since the check valve 80c and the ultraviolet irradiator 55 are disposed downstream of the post-treatment activated carbon filter 54, even if a part of the pipeline 70 comes into contact with air when the filter unit 30 is replaced, various germs are present. Is prevented from entering the pipe line 70, so that it can be used in a sanitary manner.

As mentioned above, although the permeated water manufacturing apparatus 10 in this Embodiment was demonstrated in detail, the permeated water manufacturing apparatus 10 of this invention is not limited to embodiment described above, The permeation | transmission in another form Of course, the present invention can also be applied to a water production apparatus.
For example, in the present embodiment, the polypropylene filter 33 is used in the filter unit 30, but other resin filters can of course be used as long as a filtration process equivalent to or higher than that of the polypropylene filter 33 is possible. . In addition, a check valve 80, a solenoid valve 82, and a flow rate adjusting valve 84 are disposed in the pipeline 70 at various locations, but these may be replaced with a flow rate adjusting valve 84 whose opening / closing operation can be controlled by the control means. Is possible.

Further, in the above embodiment, the concentrated water is treated by making the waste water storage tank 60 detachable from the housing 12, but the concentrated water stored in the waste water storage tank 60 is drainage drainage. It is also possible to use a form of discharging from (not shown). In this case, of course, the limit switch 64 becomes unnecessary.
Further, the flow regulating valve 84 (flow regulating mechanism) has a branch valve structure capable of distributing the flow, one branch destination is connected to the upstream side of the pump 40, and the other branch destination is connected to the waste water storage tank 60. If the concentrated water disposal flow path is formed, it is possible to appropriately handle the concentrated water according to the state of the concentrated water circulating through the filter unit 30, which is preferable.
Furthermore, the form which connects the permeated water manufacturing apparatus 10 directly to water supply may be sufficient. In this case, the arrangement of the water supply tank 20 can be omitted, and the arrangement of the waste water storage tank 60 can also be omitted, which is convenient.

It is explanatory drawing which shows the internal structure of the permeated water manufacturing apparatus in this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Permeated water manufacturing apparatus 12 Case 14 Water leak detection sensor 20 Water supply tank 30 Filter unit 32 Activated carbon filter 33 Polypropylene filter 34 Pretreatment filter 36 Reverse osmosis membrane filter 40 Pump 50 Permeate water storage tank 52 Pressure switch 54 Post treatment activated carbon filter 55 Ultraviolet irradiator 56 Warm water tank 58 Cold water tank 60 Waste water storage tank 70 Pipe line 72 Bypass path 80 Check valve 82 Solenoid valve 84 Flow control valve

Claims (7)

Obtained by allowing a water supply tank, a filter unit containing a reverse osmosis membrane filter and a pretreatment filter, a pump for supplying water from the water supply tank to the filter unit at a predetermined pressure, and passing through the filter unit. A permeate water storage tank for storing permeate water, a water intake port for extracting permeate water from the permeate water storage tank, and a waste water storage tank for storing concentrated water in the filter unit are connected by a pipe line,
The permeated water producing apparatus according to claim 1, wherein a bypass path for circulating the concentrated water in the filter unit to the pump is provided in the pipe line.   The permeated water manufacturing apparatus according to claim 1, wherein a flow rate adjusting mechanism is provided in the bypass passage. A pressure sensor for measuring the internal pressure of the permeate storage tank;
It has control means for controlling the operations of the pump and the flow rate adjusting mechanism so that the permeated water storage tank is always filled with permeated water based on the measurement value of the pressure sensor. The permeated water production apparatus according to claim 1 or 2.   The bypass channel includes a concentrated water disposal channel connected to the waste water storage tank, and an inflow of concentrated water to the concentrated water disposal channel according to an increase or decrease in the circulating flow rate of the concentrated water by the flow rate adjusting mechanism. The permeated water production apparatus according to any one of claims 1 to 3, wherein a flow rate adjusting valve for adjusting the amount is provided.   The permeated water production apparatus according to any one of claims 1 to 4, wherein the pretreatment filter is arranged in the order of a fibrous activated carbon filter, a granular activated carbon filter, and a polypropylene filter.   The permeated water production apparatus according to any one of claims 1 to 5, wherein a post-treatment activated carbon filter is disposed between the permeated water storage tank and the water intake. The permeated water production apparatus according to any one of claims 1 to 6, wherein a foreign matter mixing prevention filter is disposed in front of the pump.

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