JP2021159894A - Water purification system - Google Patents

Abstract

To provide a water purification system comprising a reverse osmosis membrane water purifier that has a good appearance, can be easily connected to a faucet, and eliminates an unsanitary space where flow is stopped so as to prevent users from drinking purified water contaminated with bacteria.SOLUTION: A water purification system that comprises, in order from the upstream side of the flow of water, activated charcoal units 3 and 5 containing activated carbon, a reverse osmosis membrane unit 4 containing a reverse osmosis membrane, and a reverse osmosis membrane water purifier 2 to which a hollow fiber membrane unit 40 containing a hollow fiber membrane is connected so as to pass water. The hollow fiber membrane unit is composed of a lower housing having an inflow port 44 for water to flow in, an upper housing having an outflow port 45 for water to flow out, and a hollow fiber membrane module fixed in an internal space formed by the lower housing and the upper housing. The hollow fiber membrane module is composed of a substantially cylindrical module case with multiple openings that communicate with the inflow port of the lower housing on an outer periphery surface, and a hollow fiber membrane bundle that is stored in the internal space of the module case by being fixed to the module case by an adhesive.SELECTED DRAWING: Figure 1

Description

The present invention relates to a water purification system including a faucet installed in a kitchen of a general household and a reverse osmosis membrane water purifier installed under a sink in the kitchen.

Conventionally, as a water purifier that purifies tap water, a faucet direct connection type water purifier that is directly connected to the outlet of a tap water faucet, a stationary water purifier that is used by placing it on the kitchen, and a water purifier that is used by placing it under the sink of the kitchen. Undersink type water purifiers are known. Filter media used include activated carbon, ion exchangers, microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes and the like. A reverse osmosis membrane is used when removal of heavy metal ions is required, but in order to prevent deterioration of the reverse osmosis membrane, pretreated activated charcoal is placed on the upstream side of the reverse osmosis membrane, and the amount of water permeated by the reverse osmosis membrane is small. A water storage tank is arranged on the downstream side of the reverse osmosis membrane to supplement the above, and a post-treatment activated charcoal is arranged on the downstream side of the water storage tank to remove the odor of the water storage tank. As described above, in the configuration using the reverse osmosis membrane, the water purifier becomes considerably large. Therefore, if it is installed above the sink in the kitchen, it will be an obstacle, so it is often installed under the sink. Under the sink in the kitchen, the activated carbon, the reverse osmosis membrane, and the water storage tank are connected by piping, and the most downstream side is connected to the faucet fixed to the top plate of the sink. That is, it is an undersink type water purifier. When the faucet is opened, purified water is discharged via pre-treated activated carbon, reverse osmosis membrane, water storage tank, and post-treated activated carbon.

However, since the pretreated activated carbon installed upstream of the reverse osmosis membrane removes residual chlorine in tap water, there is no bactericidal activity on the downstream side of the pretreated activated carbon when the reverse osmosis membrane water purifier is not used. Water will stay. There was a problem of so-called back pollution in which bacteria that invaded from the outlet of the faucet proliferated in this water without bactericidal activity. This problem is that the user of the reverse osmosis membrane water purifier drinks purified water mixed with bacteria.

To solve this problem, Patent Document 1 discloses a reverse osmosis membrane water purifier in which a microfiltration membrane is arranged on the upstream side of the faucet. Bacteria can be removed with a microfiltration membrane, and it is possible to prevent the user from drinking purified water containing bacteria.

Further, Patent Document 2 discloses a reverse osmosis membrane water purifier in which a microfiltration membrane is attached to the downstream side of the post-treated activated carbon. The microfiltration membrane can prevent the invasion of bacteria that have invaded from the outlet of the faucet to the further upstream side, and can prevent the user from drinking purified water mixed with the bacteria.

Japanese Unexamined Patent Publication No. 2005-205256 Japanese Unexamined Patent Publication No. 11-319827

However, in the reverse osmosis membrane water purifier disclosed in Patent Document 1, water flows in from the side of the container containing the microfiltration membrane and flows out downward, so that the microfiltration membrane stands upright on the top plate of the kitchen sink. There was a problem that it was difficult to attach to the faucet.

Further, in the reverse osmosis membrane water purifier disclosed in Patent Document 2, a container containing a microfiltration membrane is horizontally installed, and water flows in from one end of the container and flows out to the other end, so that the air inside the container is used. There was a problem that it was difficult to remove. In addition, it is not desirable from a hygienic point of view that there is a space where the flow is stopped. Furthermore, the piping from the microfiltration membrane to the faucet is long because it bypasses the water storage tank, and the amount of accumulated water is large. Therefore, when the user uses the reverse osmosis membrane water purifier, there is a problem that the bacteria that have grown in the stagnant water cannot be completely discharged by discarding water for a short time, and the user drinks the purified water mixed with the bacteria. there were.

In view of the above problems, the present invention is a reverse osmosis membrane water purifier that does not allow the user to drink purified water mixed with bacteria, has no unsanitary space where the flow is stopped, and can be easily connected to a faucet. To provide a water purification system equipped with.

The water purification system to solve the above problems is
A water purification system equipped with a faucet installed in the kitchen and a reverse osmosis membrane water purifier installed under the sink in the kitchen.
In the reverse osmosis membrane water purifier, water can pass through an activated charcoal unit containing activated charcoal, a reverse osmosis membrane unit containing a reverse osmosis membrane, and a hollow fiber membrane unit containing a hollow fiber membrane in order from the upstream side of the water flow. Connected and
The hollow fiber membrane unit includes a lower housing having an inflow port for water to flow in, an upper housing having an outlet for water to flow out, and a hollow fiber membrane module fixed in an internal space formed by the lower housing and the upper housing. Consists of,
The hollow fiber membrane module is housed in a substantially cylindrical module case having a plurality of openings communicating with the inlet of the lower housing on the outer peripheral surface, and fixed to the module case with an adhesive material in the internal space of the module case. Consists of hollow fiber membrane bundles,
The hollow fiber membrane unit is installed so that the inlet of the lower housing faces the lower side in the vertical direction and the outlet of the upper housing faces the upper side in the vertical direction.

The water purification system of the present invention preferably has any of the following aspects (1) to (4).
(1) The hollow fiber membrane unit is installed at a position where the flow path volume from the downstream side of the hollow fiber membrane module to the discharge port of the faucet is 50 mL or less.
(2) The upper housing and the lower housing are integrated by welding.
(3) A granular and / or powdery antibacterial material and an antibacterial material holding portion for holding the antibacterial material are provided in the internal space formed by the lower housing and the upper housing.
(4) The antibacterial material is silver-impregnated activated carbon or silver-containing zeolite.

Since the water purification system of the present invention includes a hollow fiber membrane unit under the kitchen sink and between the reverse osmosis membrane and the faucet, the user does not drink purified water mixed with bacteria. Furthermore, the area around the discharge port of the faucet is clean and the appearance is good.

In the water purification system of the present invention, the hollow fiber membrane unit is installed so that the inlet of the lower housing faces downward in the vertical direction and the outlet of the upper housing faces upward in the vertical direction. Easy to connect and easy to install. Further, since water flows from the inflow port on the lower side in the vertical direction to the outflow port on the upper side in the vertical direction, air can easily escape.

In the water purification system of the present invention, the hollow fiber membrane module has a plurality of openings on the outer peripheral surface of the module case that communicate with the inflow port of the lower housing, so that the air is discharged without stopping and the flow is stopped. It is hygienic without any.

In the water purification system of the preferred embodiment of the present invention, the flow path volume on the downstream side of the hollow fiber membrane module and on the upstream side of the faucet discharge port is 50 mL or less, so that when the user uses a reverse osmosis membrane water purifier. , Bacteria that have grown in the stagnant water can be flushed out with a short time of waste water.

In the water purification system of the preferred embodiment of the present invention, since the upper housing and the lower housing are integrated by welding, the water purification system is small in size, easy to install, has high pressure resistance, and is safe.

The water purification system of the preferred embodiment of the present invention is hollow because the internal space formed by the lower housing and the upper housing includes a granular and / or powdery antibacterial material and an antibacterial material holding portion for holding the antibacterial material. The growth of bacteria captured by the filament membrane can be suppressed. Further, when the antibacterial material is silver-impregnated activated carbon or silver-containing zeolite, the effect of suppressing bacterial growth is further enhanced.

It is a flow path block diagram of the water purification system which concerns on one Embodiment of this invention. It is the schematic sectional drawing of the hollow fiber membrane unit which concerns on one Embodiment of this invention. It is the schematic sectional drawing of the hollow fiber membrane unit which concerns on 2nd Embodiment of this invention. It is the schematic sectional drawing of the hollow fiber membrane unit which concerns on 3rd Embodiment of this invention.

An embodiment of the water purification system in the present invention will be described with reference to the drawings.
FIG. 1 is a flow path configuration diagram showing an example in which the water purification system 1 in the present invention is connected to the water supply source 31. The water purification system 1 is composed of a reverse osmosis membrane water purifier 2 connected to a water supply source 31 and a faucet 21 installed in the kitchen. 6. A reverse osmosis membrane unit 4, a post-installed activated carbon unit 5, and a hollow fiber membrane unit 40 are provided. The pre-installed activated carbon unit 3, the reverse osmosis membrane unit 4, the post-installed activated carbon unit 5, and the hollow fiber membrane unit 40 are removable, and are replaced with new units after a predetermined number of years have passed or after a predetermined flow rate of water has passed.

The pre-activated carbon unit 3 is connected to the water supply source 31 via the raw water inlet pipe 7, the inlet pressure sensor 19, and the solenoid valve 14 in this order. The pre-activated carbon unit 3 is filled with granular activated carbon to decompose free residual chlorine in tap water and adsorb and remove organic substances and the like. Since free residual chlorine is decomposed, deterioration of the reverse osmosis membrane provided downstream can be prevented. However, the bactericidal power of free residual chlorine also disappears. Instead of granular activated carbon, a molded product obtained by molding powdered activated carbon, granular activated carbon or fibrous activated carbon may be used. By combining activated carbon with non-woven fabric, metal or resin mesh, or resin porous molded body, turbid substances such as iron rust can be removed, and the reverse osmosis membrane prepared downstream is damaged. Can be prevented. If they are provided downstream of the granular activated carbon, fine powder of the activated carbon can be removed.

The inlet pressure sensor 19 is provided to detect the water pressure from the water supply source 31. The water pressure detection result is transmitted to the control unit 12, and if the water pressure is equal to or higher than a predetermined water pressure (first water pressure threshold value), the reverse osmosis membrane water purifier 2 can be operated. If the water pressure is less than the predetermined water pressure (first water pressure threshold value), the reverse osmosis membrane water purifier 2 cannot be operated. That is, it prevents the pump 6 from running idle without being supplied with water.

The solenoid valve 14 is controlled by the control unit 12 so as to be opened when the reverse osmosis membrane water purifier 2 is operated and closed when the reverse osmosis membrane water purifier 2 is stopped. When the inlet pressure sensor 19 detects that the water pressure is equal to or higher than the predetermined water pressure (first water pressure threshold) and the permeated water pressure sensor 16 detects that the water pressure is less than the predetermined water pressure (second water pressure threshold), the inlet pressure sensor 19 opens. ing. The second water pressure threshold will be described later.

The reverse osmosis membrane unit 4 is connected to the pre-activated carbon unit 3 via a pump 6. The reverse osmosis membrane unit 4 contains a reverse osmosis membrane element in which a reverse osmosis membrane is wound in a columnar shape in a central pipe. The treated water of the pre-activated carbon unit 3 is boosted by the pump 6 and is divided into permeated water that flows in from one end surface of the reverse osmosis membrane element and discharges from the central pipe and concentrated water that flows out from the other end surface. Permeated water from which metal ions and organic substances have been removed by a reverse osmosis membrane has lower electrical conductivity than tap water, and concentrated water has higher electrical conductivity than tap water. The concentrated water is discharged from the concentrated water outlet pipe 9 into the drainage path.

The post-installed activated carbon unit 5 is connected to the reverse osmosis membrane unit 4 via a check valve 17 and a permeated water pressure sensor 16 in this order. The post-installed activated carbon unit 5 contains a molded body obtained by molding granular activated carbon into a cylindrical shape using a binder. The permeated water of the reverse osmosis membrane unit 4 flows in and adsorbs and removes a very small amount of eluate from the reverse osmosis membrane. Silver-impregnated / granular activated carbon may be used as the granular activated carbon, and if an antibacterial agent such as silver-containing zeolite is mixed, the growth of bacteria in the post-installed activated carbon unit 5 can be suppressed. Granular activated carbon may be used without molding.

The post-activated carbon unit 5 does not necessarily have to be provided. If it can be confirmed that even a very small amount of eluate does not exude from the reverse osmosis membrane by thoroughly washing the reverse osmosis membrane unit 4 before use, the post-activated carbon unit 5 may not be provided.

The permeated water pressure sensor 16 is provided to detect the pressure of the permeated water. The water pressure detection result is transmitted to the control unit 12, and if the water pressure is less than a predetermined water pressure (second water pressure threshold value), the reverse osmosis membrane water purifier 2 can be operated. If the water pressure is equal to or higher than the predetermined water pressure (second water pressure threshold value), the reverse osmosis membrane water purifier 2 is stopped. When the user closes the faucet 21 installed in the kitchen, the permeated water is boosted, and when the water pressure exceeds a predetermined water pressure (second water pressure threshold value), the pump 6 is stopped and the solenoid valve 14 is closed. There is. When the user opens the faucet 21, the permeated water is lowered, and when the water pressure becomes lower than a predetermined water pressure (second water pressure threshold value), the solenoid valve 14 is opened and the pump 6 is started to operate.

The check valve 17 is provided to prevent the backflow of permeated water. When the user closes the faucet 21 installed in the kitchen, the permeated water is boosted and the pump 6 is stopped, but without the check valve 17, the permeated water flows back to the concentrated water side. When the permeated water is lowered due to the backflow, the solenoid valve 14 opens again and the pump 6 starts operation. A check valve 17 is provided so that such a malfunction does not occur.

The hollow fiber membrane unit 40 is connected to the post-activated carbon unit 5 via an electric conductivity meter 13.

FIG. 2 is a schematic cross-sectional view of the hollow fiber membrane unit 40 in the present invention. The hollow fiber membrane unit 40 is fixed to an internal space formed by a lower housing 41 having an inflow port 44 for water to flow in, an upper housing 42 having an outflow port 45 for water to flow out, a lower housing 41 and an upper housing 42. It is composed of a hollow fiber membrane module 43.

The hollow fiber membrane unit 40 is installed so that the inflow port 44 of the lower housing 41 faces downward in the vertical direction and the outlet 45 of the upper housing 42 faces upward in the vertical direction. The inflow port 44 can be easily connected, and the faucet 21 upright on the top plate of the kitchen and the outflow port 45 can be easily connected. It is also possible to prevent the hose used for connection from bending and reducing the amount of purified water discharged from the faucet.
A one-touch hose joint is attached to the inflow port 44 of the lower housing 41 so that the hose can rotate with respect to the lower housing 41. The same applies to the outlet 45 of the upper housing 42. It prevents the hose from being installed in a twisted state. When replacing the hollow fiber membrane unit 40, it can be removed from the hose with one touch, so that it can be easily carried out while maintaining hygiene.

The hollow fiber membrane module 43 is composed of a substantially cylindrical module case 46, and a hollow fiber membrane 49 fixed and stored by the module case 46 and the adhesive material 48. The outer peripheral surface of the module case 46 has a plurality of openings 47 communicating with the inflow port 44 of the lower housing 41. The treated water of the post-activated carbon unit 5 flows in from the inflow port 44 on the lower side in the vertical direction, partly from the upstream side / end face opening of the hollow fiber membrane module 46, and partly to the outer peripheral side of the hollow fiber membrane module 46. It wraps around and enters the hollow fiber membrane module 46 through the opening 47. Next, it is filtered by the hollow fiber membrane 49 and flows out from the outlet 45 on the upper side in the vertical direction. It is hygienic because there is no space where the flow is stopped. Since the air flows from the lower side in the vertical direction to the upper side, the air inside the hollow fiber membrane unit 40 is easily released.

For the hollow fiber membrane 49, a hydrophilic / microfiltration membrane obtained by hydrophilizing polysulfone is used, and several polyethylene hydrophobic / microfiltration membranes are mixed. Polysulfone is biologically superior and is preferred for water purifier applications. Polyether sulfone, polyfinylene sulfone, polyethylene, polypropylene, cellulose acetate, and polyacrylonitrile may be hydrophilized and used. It is desirable to prevent the passage of bacteria and to have high water permeability, and the filtration accuracy of the microfiltration membrane is preferably 0.1 μm or more and 0.3 μm or less. The microfiltration membrane can remove bacteria generated on the downstream side of the post-activated carbon unit 5 and prevent the user from drinking purified water mixed with the bacteria.

Hydrophobic and microfiltration membranes are mixed to remove air. When the reverse osmosis membrane unit 4 is replaced with a new one and the hollow fiber membrane unit 40 is continuously used, air flows from the reverse osmosis membrane unit 4 into the hollow fiber membrane unit 40 via the post-activated carbon unit 5. If the hydrophilic microfiltration membrane is wet with water, it is difficult for air to pass through, but if a hydrophobic and precision filtration membrane is mixed, air can be removed smoothly.

Polypropylene is used for the lower housing 41 and the upper housing 42, and they are integrated by a rotary welding method. In the rotary welding method, thick upper and lower housings can be firmly welded, so that the pressure resistance is high, and it is possible to prevent damage due to a high water pressure. A screw and a female screw may be formed in the upper and lower housings and fastened with the screw. In addition to polypropylene, ABS resin or HIPS (high impact polystyrene) having high molding accuracy may be used, and PPS (polyphenylene sulfide) or PPO (polyphenylene oxide) having high strength may be used. If glass fiber is contained, the strength can be further improved.

The outlet 45 of the hollow fiber membrane unit 40 and the faucet 21 are connected at a short distance of 50 mm or less, and the flow path volume from the downstream side of the hollow fiber membrane module 46 to the discharge port of the faucet 21 is 50 mL or less. ing. As a result, when the user uses the reverse osmosis membrane water purifier, the bacteria that have grown in the retained water can be flushed out with a short amount of waste water.

It is preferable that the internal space formed by the lower housing 41 and the upper housing 42 is provided with a granular and / or powdery antibacterial material and an antibacterial material holding portion for holding the antibacterial material. The hollow fiber membrane unit of the second embodiment shown in FIG. 3 is provided with a spherical antibacterial agent 51 on the downstream side of the hollow fiber membrane module 46, and holds the antibacterial agent so that it does not flow out downstream of the outlet 45. A portion 52 is provided. Even if bacteria invading from the discharge port of the faucet 21 reach the hollow fiber membrane module 46, they do not spread upstream from the hollow fiber membrane 49, and the growth is suppressed by the spherical antibacterial agent 51.

In the hollow fiber membrane unit of the third embodiment shown in FIG. 4, a small amount of powdery antibacterial agent 53 is filled in the internal space of the hollow fiber membrane module 46, and the outer peripheral antibacterial agent is held so that it does not flow back upstream. A portion 54 and an end face antibacterial agent holding portion 55 are provided. Even if bacteria are present in the hollow fiber membrane module 46 and its upstream, they do not flow out downstream from the hollow fiber membrane 49, and their growth is suppressed by the powdery antibacterial agent 53. When silver-impregnated activated carbon or silver-containing zeolite is used as the antibacterial agent, the amount of silver elution can be appropriately adjusted and maintained for a long period of time, and bacterial growth can be effectively suppressed.

Next, the operation of the water purification system 1 including the faucet 21 installed in the kitchen and the reverse osmosis membrane water purifier 2 installed under the sink of the kitchen will be described.

When the user opens the faucet 21 to obtain purified water, the permeated water is stepped down, and the permeated water pressure sensor 16 detects that the water pressure is less than a predetermined water pressure (second water pressure threshold value). At the same time, when the inlet pressure sensor 19 detects that the water pressure from the water supply source 31 is equal to or higher than a predetermined water pressure (first water pressure threshold value), the solenoid valve 14 opens and the pump 6 starts operation. In the tap water supplied from the water supply source 31, free residual chlorine is decomposed by the granular activated carbon of the pre-activated carbon unit 3, and organic substances and the like are adsorbed and removed. Since free residual chlorine is decomposed, deterioration of the reverse osmosis membrane provided downstream can be prevented. However, the bactericidal power of free residual chlorine also disappears.

The treated water of the pre-activated carbon unit 3 is boosted by the pump 6 and flows in from one end surface of the reverse osmosis membrane element, and the permeated water from which metal ions and organic substances have been removed by the reverse osmosis membrane is discharged from the central pipe. The concentrated water flowing out from the other end surface is discharged from the concentrated water outlet pipe 9 into the drainage path.

The permeated water of the reverse osmosis membrane unit 4 flows into the reverse osmosis membrane unit 4 via the check valve 17 and the permeated water pressure sensor 16 in this order, and adsorbs and removes a very small amount of eluate from the reverse osmosis membrane. The treated water of the post-activated carbon unit 5 flows in from the inflow port 44 of the hollow fiber membrane unit 40, is filtered by the hollow fiber membrane, and flows out from the outflow port 45. The treated water of the hollow fiber membrane unit 40 is discharged from the discharge port of the faucet 21, and the user can obtain purified water.

When the user closes the faucet 21 to stop the water, the permeated water is boosted and the permeated water pressure sensor 16 detects that the water pressure (second water pressure threshold value) or higher is reached. The operation of the pump 6 is stopped, the solenoid valve 14 is closed, and the reverse osmosis membrane water purifier 2 is in a standby state.

<Example 1>
The water purification system 1 shown in FIG. 1 including a pre-activated carbon unit 3, a reverse osmosis membrane unit 4, a post-activated carbon unit 5, a hollow fiber membrane unit 40, and a faucet 21 was configured. The pre-activated carbon unit was sequentially filled with 40/80 mesh granular activated carbon and a pleated filter using a non-woven fabric. The reverse osmosis membrane unit includes Toray Advanced Materials Korea Inc. RO element RE3012 made by the company was built in. The post-installed activated carbon contained a molded body formed into a cylindrical shape with granular activated carbon and a binder. The hollow fiber membrane unit 40 contains a hollow fiber membrane module 43 in which a hollow fiber membrane of a hydrophilic / microfiltration membrane having a filtration accuracy of 0.15 μm is fixed. A vertical single faucet was used as the faucet. The volume of the flow path from the downstream side of the hollow fiber membrane module to the discharge port of the faucet was 18 mL.

After opening the faucet and discharging purified water, the faucet was closed and left for 2 weeks, and then when the faucet was opened, purified water was sampled and the number of general bacteria was measured. The general number of bacteria in purified water was 23 cells / mL, but it became 0 cells / mL after discarding water for 10 seconds. It is probable that the bacteria that invaded from the outlet of the faucet grew, but did not spread upstream of the hollow fiber membrane unit 40, and were washed away with a small amount of waste water. The user was able to obtain safe purified water just by waiting for 10 seconds.

<Comparative example 1>
The same water purification system as in Example 1 was configured except that the hollow fiber membrane unit was not provided. The volume of the flow path from the activated carbon molded body built in the post-activated carbon unit to the outlet of the faucet was 400 mL.

After opening the faucet and discharging purified water, the faucet was closed and left for 2 weeks, and then when the faucet was opened, purified water was sampled and the number of general bacteria was measured. The general number of bacteria in purified water was 6900 cells / mL, and after discarding water for 10 seconds, it was 460 cells / mL. It is probable that the bacteria that invaded from the outlet of the faucet proliferated and spread to the molded product, and could not be washed away with a small amount of waste water. The user has to wait 60 seconds to obtain safe purified water, and the user may accidentally drink purified water containing bacteria.

1 Water purification system 2 Reverse osmosis membrane water purifier 3 Pre-installed activated carbon unit 4 Reverse osmosis membrane unit 5 Post-activated carbon unit 6 Pump 7 Raw water inlet pipe 8 Permeated water outlet pipe 9 Concentrated water outlet pipe 12 Control unit 13 Electric conductivity meter 14 Electromagnetic valve 16 Permeated water pressure sensor 17 Reverse osmosis valve 19 Inlet pressure sensor 21 Faucet 31 Water supply source 40 Hollow fiber membrane unit 41 Lower housing 42 Upper housing 43 Hollow fiber membrane module 44 Inflow port 45 Outlet 46 Module case 47 Opening 48 Adhesive 49 Hollow fiber membrane 51 Antibacterial agent 52 Antibacterial agent holding part 53 Antibacterial agent 54 Outer peripheral antibacterial agent holding part 55 End face antibacterial agent holding part

Claims (6)

A water purification system equipped with a faucet installed in the kitchen and a reverse osmosis membrane water purifier installed under the sink in the kitchen.
In the reverse osmosis membrane water purifier, water can pass through an activated charcoal unit containing activated charcoal, a reverse osmosis membrane unit containing a reverse osmosis membrane, and a hollow fiber membrane unit containing a hollow fiber membrane in order from the upstream side of the water flow. Connected and
The hollow fiber membrane unit includes a lower housing having an inflow port for water to flow in, an upper housing having an outlet for water to flow out, and a hollow fiber membrane module fixed in an internal space formed by the lower housing and the upper housing. Consists of,
The hollow fiber membrane module is housed in a substantially cylindrical module case having a plurality of openings communicating with the inlet of the lower housing on the outer peripheral surface, and fixed to the module case with an adhesive material in the internal space of the module case. Consists of hollow fiber membrane bundles,
A water purification system in which the hollow fiber membrane unit is installed so that the inlet of the lower housing faces the lower side in the vertical direction and the outlet of the upper housing faces the upper side in the vertical direction. The water purification system according to claim 1, wherein the hollow fiber membrane unit is installed at a position where the flow path volume from the downstream side of the hollow fiber membrane module to the discharge port of the faucet is 50 mL or less. The water purification system according to claim 1 or 2, wherein the hollow fiber membrane unit is integrated with the upper housing and the lower housing by welding. According to claim 1, the hollow fiber membrane unit has an antibacterial material holding portion for holding a granular and / or powdery antibacterial material and an antibacterial material in an internal space formed by the lower housing and the upper housing. Any of the three water purification systems. The water purification system according to claim 4, wherein the antibacterial material is silver-impregnated activated carbon. The water purification system according to claim 4, wherein the antibacterial material is silver-containing zeolite.

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