JP2005118708A - Water cleaning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water cleaning system capable of stably and efficiently providing a cleaned water of high quality. <P>SOLUTION: The water cleaning system 1 is provided with a treatment object water supply means 3 for supplying treatment object water, a pump 5 for controlling supply water pressure of the treatment object water, a treatment object water storage 7 wherein the treatment object water pressured by the pump 5 is introduced, a plurality of treatment object water distribution ports 9 for distributing and draining the treatment object water from the storage 7, a plurality of reverse osmosis membrane modules 11 wherein the treatment object water distributed from the treatment object water distribution ports 9 is introduced and has reverse osmosis membranes for treating the treatment object water, a cleaned water supply means 13 for supplying cleaned water obtained by passing through the reverse osmosis membranes, and a drainage means 15 for draining uncleaned water not passing through the reverse osmosis membranes. The treatment object water is made predetermined uniform water pressure in the treatment object water storage 7 and supplied to the plurality of reverse osmosis membrane modules from the treatment object water distribution ports with stable water pressure and quantity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water purification apparatus. In particular, the present invention relates to a water purification device that purifies water by passing through a reverse osmosis membrane.

Various water purification apparatuses using reverse osmosis membranes are used. Generally, a reverse osmosis membrane has ultrafine pores, that is, pores having a pore diameter of about 0.1 nm. By allowing water to permeate through this membrane (reverse osmosis), water molecules and dioxins, nitrite nitrogen, cadmium, arsenic, bacteria, viruses and other harmful substances can be separated to obtain pure water. Water purification devices using reverse osmosis membranes can be used for the production of drinking water for vending machines from large seawater desalination devices, household water purifiers, or various industrial waters that require high purity, such as pure water for electronic industries, Widely used in boiler water, juice and wine production.
Among these water purification apparatuses, one having a high purified water production capacity (efficiency) is one in which the supply water pressure to the reverse osmosis membrane is set to a relatively medium high pressure (that is, 0.69 MPa or more). This type of water purification device has a high water permeation rate and a high purification capacity in order to permeate water at medium and high pressures. However, when tap water, chlorine, hypochlorous acid, etc. are contained in the water to be treated (hereinafter referred to as “treated water”), it is compared when the treated water passes through the reverse osmosis membrane. As a result, the chlorine component gasified from the water to be treated may be dissolved again in the water purified through the reverse osmosis membrane (hereinafter referred to as “purified water”). . In this case, the purified water may have a chlorine odor, which is not preferable.
On the other hand, when the supply water pressure to the reverse osmosis membrane is low, typically 0.5 MPa or less (for example, about 0.36 MPa), gasification of the chlorine component does not occur and the above problems do not occur. . However, if the supply water pressure is low, the permeation rate to the reverse osmosis membrane is also slowed, and there is a problem that the amount of purified water produced (efficiency) is low. For this reason, conventionally, a plurality of reverse osmosis membranes (specifically, reverse osmosis membrane modules equipped with membranes) are simultaneously used, and as a result, the amount of purified water to be treated per unit time has been earned. In this case, the water to be treated was supplied to each reverse osmosis membrane module through a branch pipe appropriately branched from a predetermined supply water source.

However, in the form in which treated water is supplied to two or more reverse osmosis membrane modules by a conventional branch pipe, the pressure and flow rate of the supplied treated water are kept substantially constant and uniform between the two or more reverse osmosis membrane modules. It was difficult. That is, there is a case where the desired high purification efficiency cannot be realized because the purification efficiency of each reverse osmosis membrane module is uneven and the amount of purification water varies.
The present invention has been developed to solve such conventional problems, and an object thereof is to provide a water purification device capable of stably and efficiently producing high-quality purified water and purified water produced by the device. And

A water purification apparatus according to the present invention includes a treated water supply means for supplying treated water, a pump for adjusting a supply water pressure of the treated water, and a treated water into which treated water pressurized by the pump is introduced. A treated water reservoir, a plurality of treated water distribution ports for distributing and discharging treated water from the reservoir, and treated water distributed from each treated water distribution port are respectively introduced and treated water A plurality of reverse osmosis membrane modules having a reverse osmosis membrane to be treated; purified water supply means for supplying purified water obtained by permeating the reverse osmosis membrane; and discharging non-purified water that does not pass through the reverse osmosis membrane. A drainage means.
In the water purification apparatus having such a configuration, the water to be treated is pressurized by a pump and is temporarily introduced from the water to be treated supply means into the water to be treated. Here, the treated water is brought to a predetermined uniform pressure in the treated water reservoir. And the to-be-purified water is distributed and supplied to each reverse osmosis membrane module from each to-be-treated water distribution port of this reservoir. At this time, the treated water can be supplied to the plurality of reverse osmotic pressure modules from the treated water distribution port at a predetermined uniform pressure and at a stable flow rate. For this reason, it is possible to stably purify a water amount that is always constant and uniform for each module, while increasing the amount of water to be purified using a plurality of reverse osmosis membrane modules. Thereafter, a part of the water to be treated passes through the reverse osmosis membrane of the reverse osmosis membrane module to become purified water, and is supplied to a predetermined water supply destination by the purified water supply means. On the other hand, the portion that does not pass through the reverse osmosis membrane (non-purified water) is drained outside the apparatus by the drainage means.

  In particular, the water pressure of the treated water distributed from the treated water distribution port is preferably 0.5 Pa or less. Since the water pressure is such a low pressure, gasification of the chlorine component is prevented, so that the residual chlorine component in the purified water is reduced. Accordingly, the purification performance is excellent.

  Preferably, the treated water reservoir is substantially cylindrical, and the treated water distribution port is substantially circular. When the treated water reservoir is substantially cylindrical, the water pressure in the reservoir becomes more stable and uniform, and the water pressure and flow rate distributed to the treated water distribution port can be kept more stable and constant. Moreover, when the treated water distribution port is substantially circular, the drainage pressure becomes more stable and uniform, and the water pressure and flow rate distributed to the reverse osmosis membrane module can be more stably maintained constant.

  Preferably, the treated water distribution port is provided non-uniaxially on the cylindrical surface of the cylindrical treated water reservoir (that is, not arranged in a line in the longitudinal direction of the cylindrical treated water reservoir). It has been. Since the treated water distribution ports are provided non-uniaxially, it is possible to secure a wider space between the treated water distribution ports, and to reduce the strength of the treated water reservoir by providing a plurality of treated water distribution ports. Can be suppressed.

  Of these, the cross-sectional opening area substantially perpendicular to the longitudinal direction in the cylindrical treated water reservoir is preferably larger than the total opening area of the plurality of treated water distribution ports. With this configuration, the water to be treated can be temporarily stored in the reservoir, and the water pressure in the reservoir can be more stably and uniformly maintained. For this reason, to-be-processed water can be supplied to a to-be-processed water distribution port by the more stable water pressure and flow volume.

  Further, among these, the diameter of the treated water reservoir is preferably larger than the sum of the diameters of the plurality of treated water distribution ports. With this configuration, the water pressure in the reservoir can be maintained more stably and uniformly, and the treated water can be supplied to the treated water distribution port at a more stable water pressure and flow rate.

  Preferably, the drainage means has a drainage reservoir that temporarily collects the non-purified water discharged from the plurality of reverse osmosis membrane modules before discharging out of the apparatus. According to this configuration, the drainage from each reverse osmosis membrane module can be once introduced into the drainage reservoir and drained at a predetermined uniform water pressure and flow rate. Moreover, the drain pressure from each reverse osmosis membrane module can be uniformly controlled by one valve.

  Preferably, the treated water supply means is provided with pretreatment filtering means for preliminarily filtering the treated water. With this configuration, it is possible to remove relatively large impurities in advance by the pretreatment filtering means before allowing the water to be treated to permeate the reverse osmosis membrane. For this reason, it is not necessary to purify large impurities in the reverse osmosis membrane, and the degradation of the purification performance is suppressed.

Hereinafter, preferred embodiments of the present invention will be described. Note that matters necessary for the implementation of the present invention other than the matters specifically mentioned in the present specification (for example, the treated water reservoir and the treated water distribution port) are the prior art in this field. It can be grasped as a design matter of a person skilled in the art based on this. The present invention can be carried out based on the contents disclosed in this specification and common technical knowledge in the field.
In the apparatus of this invention, what is necessary is just to be able to purify to-be-processed water using a reverse osmosis membrane, and various materials and structure can be applied for the objective. There is no particular limitation on the structure and composition of the reverse osmosis membrane.

Next, the water purification apparatus 1 which concerns on specific embodiment of this invention is demonstrated with reference to drawings. FIG. 1 is a block diagram schematically showing the outline of the configuration of a water purification apparatus 1 used for manufacturing retail drinking water (for example, it can be used as a vending machine for purified water).
Roughly speaking, the apparatus 1 includes a treated water supply means 3, a pressure pump 5, a treated water reservoir 7, a plurality (in this case, seven) of treated water distribution ports 9, and a plurality of treated water distribution ports 9. The reverse osmosis membrane module 11, the purified water supply means 13, and the drainage means 15 are configured (here, a total of seven).

  A water supply pipe 3A serving as the water to be treated 3 is in communication with a supply water source (not shown) (water supply pipe here), and the water to be treated is introduced into the apparatus as indicated by an arrow in FIG. A check valve 17 is provided in the water supply pipe 3A to prevent backflow of the water to be treated. Further, the water supply pipe 3A is provided with a water stop solenoid valve 23 for controlling the supply of water to be treated. Further, a part of the water supply pipe 3A is provided with a microfiltration filter 19 including a general filter, an ion exchange resin and the like, and an adsorption filtration filter 21 including an adsorbent such as activated carbon as pretreatment filtering means.

  The check valve 17 and the water stop electromagnetic valve 23 are not limited to this as long as they have a function of controlling the supply of water to be treated, and their mechanisms can be changed as appropriate. The pretreatment filtering means is not particularly limited as long as it is a means capable of removing relatively large impurities or dissolved ionized substances contained in the water to be treated, and a necessary filtering means can be appropriately selected. . Specifically, as the microfiltration filter 19, those capable of removing large dirt components in the water to be treated, such as mud, red rust and water stain, are applicable, and fine pores, for example, 1 to 10 μm, preferably Conventionally known filters such as those having pores of 3 to 7 μm, particularly 5 μm, for example, hollow fibers, ceramics, and reticulated foams (preferably polypropylene resin), ion exchange resins and the like can be used. The size is 10 to 60 cm, particularly 20 to 30 cm in length, and those having a diameter of 1 to 30 cm and particularly 3 to 10 cm are suitable because they can permeate the water to be treated at an appropriate flow rate even at a low pressure. .

  Further, as the adsorption filter 21, activated carbon, diatomaceous earth, ceramic, or the like that can adsorb chlorine odor for disinfection, odor of organic substances, and the like can be used. The pore diameter is, for example, preferably 0.1 to 10 μm, preferably 0.5 to 7 μm, particularly 1 to 5 μm. Further, the size is 10 to 60 cm, particularly 20 to 30 cm in length, and those having a diameter of 1 to 30 cm and particularly 3 to 10 cm are suitable because they can permeate the water to be treated at an appropriate flow rate even at a low pressure. It is. The pretreatment filtration means is not always necessary, and can be appropriately provided according to the degree of contamination of the water to be treated, the amount of treated water in the reverse osmosis membrane, and the like. Moreover, the desired 1 or 2 or 3 or more filtration filter can be provided as needed.

  The pressurizing pump 5 adjusts the supply pressure of the water to be treated. The supply pressure is a water pressure required to allow the water to be treated to permeate the reverse osmosis membrane, and is, for example, 0.5 MPa or less (for example, 0.5 to 0.1 MPa), preferably 0.4 MPa or less (for example, 0 .4 to 0.2 MPa), for example, about 0.36 MPa. When the supply pressure is within this range, gasification of the chlorine component in the water to be treated can be prevented, the permeation rate to the reverse osmosis membrane can be maintained within a predetermined range, and purified water can be secured at a desired supply amount. . The pressurizing pump 5 may be any conventionally known pump capable of controlling the water pressure, and any available pump can be appropriately selected and used.

  The treated water reservoir 7 has a substantially cylindrical shape, and a treated water introduction port 24 to which a water supply pipe 3A is connected is provided at one end in the longitudinal direction, and on the longitudinal side surface (tubular surface). A plurality of treated water distribution ports 9 are provided. In FIG. 1, seven treated water distribution ports 9 are provided, but can be appropriately changed depending on the number of reverse osmosis membrane modules used, and the number is not limited. For example, when 5 to 25 reverse osmosis membrane modules are provided, the same number of treated water distribution ports 9 can be provided. By providing the to-be-treated water reservoir 7, one pressurizing pump 5 may be provided for the to-be-treated water reservoir 7. For this reason, it is not necessary to provide a plurality of pressure pumps for each reverse osmosis membrane module, and the cost is reduced. In addition, the water pressure and flow rate of the water to be treated supplied to all the plurality of reverse osmosis membrane modules can be easily adjusted.

As shown in FIG. 2, the II-II cross-sectional opening diameter R substantially perpendicular to the longitudinal direction of the treated water reservoir 7 is typically 1 to 10 cm, preferably 2 to 5 cm, for example 2 ~ 4 cm. Moreover, the opening area of Scm ² is typically 1.5 ~78cm ^2, preferably 3～20Cm ^2, in particular 3~12cm ^2. By setting the opening diameter and / or area within this range, the treated water can be distributed and supplied to the treated water distribution port 9 of the following predetermined size with a uniform water pressure and flow rate. Furthermore, although the length is suitably selected according to the number of the reverse osmosis membrane modules 11 to be provided, it is typically 5 to 60 cm, preferably 15 to 50 cm, for example 30 to 40 cm. In addition, the shape of the to-be-treated water reservoir 7 is not limited to a cylindrical shape, and may be any shape into which the to-be-treated water can be introduced. Examples of the material of the treated water reservoir 7 include polypropylene, polyethylene, vinyl chloride, stainless steel, brass, aluminum, copper, and iron.

  The treated water distribution port 9 is non-uniaxial (here) in the longitudinal direction of the treated water reservoir 7, as shown in FIG. 3 along the III-III section showing the longitudinal side surface (tubular surface) of the treated water reservoir 7. In the zigzag), a plurality are provided. In addition, arrangement | positioning of the to-be-processed water distribution port 9 in the to-be-processed water storage device 7 is not limited to this, It can arrange | position to a desired position suitably. For example, as shown in FIG. 4, you may provide in the to-be-processed water reservoir 7 at random. Moreover, as shown in FIG. 5, you may provide in a spiral shape. Furthermore, as shown in FIG. 6, you may provide on one axis | shaft. In particular, in order to prevent a decrease in strength of the treated water reservoir 7, it is preferable that the intervals between the treated water distribution ports 9 are wide.

As shown in FIG. 3, the diameter r of the to-be-treated water distribution port 9 is, for example, 3 to 15 mm, preferably 5 to 9 mm, particularly 6 to 7 mm. The opening area smm ² is, for example, 7 to 180 mm ² , preferably 19 to 64 mm ² , and particularly 28 to 38 mm ² . Due to the opening area and / or diameter in this range, the flow rate of the water to be treated is usually 0.1 to 7 liters / minute, preferably 0.1 to 5 liters / minute, for example about Maintained at 4 liters / minute. As a result, the water purification apparatus 1 of the present embodiment preferably purifies treated water with an efficiency of 0.1 to 10 tons / day, more preferably 1 to 8 tons / day, for example, 2 to 7 tons / day. It becomes possible.

Although the shape of the to-be-processed water distribution port 9 is not specifically limited, It is preferable that it is a substantially circular shape or a substantially elliptical shape. In particular, in order to uniformly maintain the amount of water drained from each treated water distribution port 9, the shape, area, diameter, etc. of all treated water distribution ports 9 are preferably close to each other, In particular, it is optimal that they have almost the same shape and size.
The cross-sectional opening area Scm ² treated water reservoir 7 is preferably greater than the sum of the opening areas smm ² of the treated water distribution orifice 9. More preferably, the cross-sectional opening diameter Rcm of the treated water reservoir 7 is preferably larger than the sum of the diameters rmm of the treated water distribution ports 9.

The reverse osmosis membrane module 11 has a reverse osmosis membrane (not shown) built in a substantially cylindrical vessel (housing). The module 11 and the internal reverse osmosis membrane itself may be the same as those of the conventional product, and the internal structure thereof does not characterize the present invention, and thus detailed description thereof is omitted.
The reverse osmosis membrane is not particularly limited, and any conventionally known reverse osmosis membrane can be used. In particular, it can be appropriately selected from ultrafine pores, usually those having a pore diameter of 0.0001 μm or less. The reverse osmosis membrane can separate organic substances such as dioxin, nitrite nitrogen, cadmium, mercury, iron and lead. The shape of the vessel is not limited to a substantially cylindrical shape, and any shape that incorporates a reverse osmosis membrane and can pass water to be treated through the reverse osmosis membrane may be used. For example, it may be a substantially rectangular parallelepiped, a substantially spherical shape, an elliptical spherical shape, or the like. Examples of the material of the vessel include polypropylene, polyethylene, vinyl chloride, or a metal material such as stainless steel and aluminum. In addition, as a structure of the reverse osmotic pressure module 11, it is not limited to this, It can select from any conventionally well-known structure suitably.

A treated water introduction port 27 connected to the treated water distribution port 9 via a tube 25 is provided at one end in the longitudinal direction of the module 11, and treated water is distributed and supplied to each reverse osmosis membrane module 11. Is done. At the other end, a water supply port 29 for supplying purified water that has passed through the reverse osmosis membrane and a drain port 31 for discharging non-purified water that has not passed through the reverse osmosis membrane are provided.
The apparatus 1 is provided with a water supply reservoir 33 as purified water supply means 13. The water supply reservoir 33 has a substantially cylindrical shape, and is provided with the same number (seven in this case) of inlets 35 as the reverse osmosis membrane modules 11 on the longitudinal side surface (tubular surface). The module 11 is connected to the water supply port 29 via the tube 37. For this reason, the purified water that has passed through the reverse osmosis membrane is once introduced into the water supply reservoir 33 from the water supply port 29 of each module 11. In addition, arrangement | positioning of the inlet 35 in the water supply reservoir 33 can be suitably arrange | positioned in a desired position similarly to arrangement | positioning of the to-be-treated water distribution port 9 in the said to-be-treated water reservoir 7. FIG. In addition, here, each reverse osmosis membrane module 11 and the inlet 35 of the water supply reservoir 33 are connected by a single tube 37 at a ratio of 1: 1. For example, as shown in FIG. In view of this, the reverse osmosis membrane module 11 may be connected by a tube 38 that is divided into two or more branches by a branch member 38a. In this case, the volume of the water supply reservoir 33 can be reduced in size and the structure can be simplified, the device 1 can be reduced in size, or the manufacturing cost can be reduced.

  The water supply reservoir 33 is further provided with a supply outlet 39 at one end in the longitudinal direction, and the purified water once introduced is supplied from here. Further, the purified water supply means 13 is provided with a final adsorption filtration filter 41 and an electromagnetic valve 43. The electromagnetic valve 43 can control the start and stop of water supply from the water supply reservoir 33 and the amount of water supply. The electromagnetic valve 43 is not particularly limited, and can be selected from any configuration that can control a conventionally known water flow. Moreover, even when purified water is stored in the water supply reservoir 33 for a long period of time, the quality of the purified water supplied from the water supply reservoir 33 by the final adsorption filtration filter 41 can be maintained. As the final filtration filter, a filter capable of adsorbing and removing any known impurities can be appropriately selected and used, but it is preferable to select the same configuration as the adsorption filtration filter 21 of the pretreatment filtration means. .

On the other hand, as the drainage means 15, a drainage reservoir 45, a drainage pipe 47 and a cleaning drainage pipe 57 are provided. The drainage reservoir 45 according to the present embodiment has a substantially cylindrical shape, and is provided with the same number (seven in this case) of inlet ports 49 as the reverse osmosis membrane module 11 on the side surface (tubular surface) in the longitudinal direction. The drain port 31 of each reverse osmosis membrane module 11 and the tube 51 are connected. For this reason, the non-purified water that has not permeated the reverse osmosis membrane is temporarily introduced into the drainage reservoir 45 from the drainage port 31 of each reverse osmosis membrane module 11. In addition, arrangement | positioning of the inlet 49 in the waste water reservoir 45 can be suitably arrange | positioned in a desired position similarly to arrangement | positioning of the to-be-treated water distribution port 9 in the said to-be-treated water reservoir 7. The drainage reservoir 45 is further provided with a discharge port 53 at one end in the longitudinal direction, and the non-purified water once introduced is drained therefrom. A connector tube 55 is connected to the discharge port 53, and the tip of the connector tube 55 is bifurcated. One of them is provided with a drain pipe 47 and a drain pressure control valve 47A so that the drain pressure of the drain pipe 47 can be controlled. The drain pressure control valve 47A is not particularly limited, and can be selected from any configuration that can control a conventionally known water pressure. On the other hand, on the other side of the branched tube 55, a cleaning drain pipe 57 and a cleaning opening valve 57 </ b> A are provided in parallel with the drain pipe 47. After cleaning water for a predetermined amount or for a predetermined period, the drainage flow rate of non-purified water that has become high pressure in the apparatus 1 is remarkably increased by opening the cleaning opening valve 57A, and impurity particles adhering to the reverse osmosis membrane or ionized Dissolved substances can be washed away. By providing a drainage reservoir 45 in the drainage means 15 as in the present apparatus 1, non-purified water from each reverse osmosis membrane module 11 is once introduced into the drainage reservoir 45 and drained at a predetermined uniform water pressure and flow rate. Can be made. Further, the drain pressure from each reverse osmosis membrane module 11 can be uniformly controlled by one drain pressure control valve 47A.
In the present embodiment, the drain pipe 47 and the cleaning drain pipe 57 are provided in parallel via the connector tube 55, but the drain pipe 47 and the cleaning drain pipe 57 are not used without using the connector tube 55. May be directly connected to the drainage reservoir 45 (in this case, a cleaning discharge port communicating with the cleaning drainpipe 57 may be provided in addition to the discharge port 53).

Next, one aspect of a method for suitably purifying water to be treated by the water purification apparatus 1 according to the present embodiment will be specifically described.
First, the water stop electromagnetic valve 23 is opened, and water to be treated is introduced from a supply port (not shown) as indicated by an arrow in FIG. The water to be treated passes through the microfiltration filter 19 and the adsorption filtration filter 21. Next, the pressure is increased to a desired supply pressure (for example, 0.36 MPa) by the pressure pump 5 and is introduced into the treated water reservoir 7. In the treated water reservoir 7, the treated water is stored at a constant pressure (here, 0.36 MPa). And the to-be-processed water flows out from each to-be-processed water distribution port 9 with a fixed flow velocity (here 0.4 liter / min) uniformly with a fixed pressure (here 0.36 MPa) from the to-be-treated water reservoir 7. And introduced into each reverse osmosis membrane module 11.

Of the water to be treated introduced into each reverse osmosis membrane module 11, purified water that has permeated through the reverse osmosis membrane passes through the tube 37 from the water supply port 29 and is introduced into the water supply reservoir 33. Then, while controlling the supply amount of the purified water by the electromagnetic valve 43, the purified water is supplied to the bottle 63, for example, as shown in FIG. In the apparatus 1 according to this embodiment, purified water of about 6.8 tons / day can be easily obtained.
On the other hand, the non-purified water that has not passed through the reverse osmosis membrane passes through the tube 51 from the drain port 31 of the reverse osmosis membrane module 11 and is introduced into the drainage reservoir 45. Then, the drain pressure is controlled by the drain pressure control valve 47A, and the non-purified water is drained from the discharge port 53 of the drain reservoir 45.

  After purifying the water to be treated for a predetermined amount or for a predetermined period (here, 120 to 1000 tons or 2 to 6 months, whichever is earlier), the cleaning open valve 57A is opened and the cleaning drain pipe 57 is not used. Drain the purified water. Here, the non-purified water has a high pressure in the apparatus 1 and flows out vigorously by opening the cleaning opening valve 57A. Due to this high water flow rate, impurity particles adhering to the reverse osmosis membrane surface, ionized dissolved substances, and the like are washed away.

  The preferred embodiments of the present invention have been described in detail above, but these are only examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the above-described embodiments. For example, the treated water distribution port of the treated water reservoir and each reverse osmosis membrane module are connected by a single tube at a ratio of 1: 1, but this is not limited as long as the water pressure and the flow rate can be evenly branched. For example, the treated water reservoir and each reverse osmosis membrane module may be connected by two or more tubes. In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

The water purification apparatus according to the present invention is a large-scale seawater desalination apparatus, drinking water production for vending machines, household water purifiers, cooking or food industry water, or various industrial waters that require high purity, such as electronic Applicable to applications for purifying water or producing purified water, such as industrial pure water, semiconductor industrial pure water, boiler water, sterile pure water for medical injections, soft drinks and wine be able to. In particular, it is suitable for the production of drinking water or food water, for example, drinking water for vending machines, pure water for cooking or food industry.
The water purification apparatus according to the present invention is not limited to a low water pressure supplied to the reverse osmosis membrane, but is also applicable to a medium-high pressure water whose purification treatment efficiency is improved by using a plurality of reverse osmosis membrane modules. It is possible.

The block diagram explaining the composition of the water purification device concerning one embodiment typically. Explanatory drawing which shows the cross-sectional opening part of the to-be-processed water reservoir which concerns on one Embodiment. Explanatory drawing which shows an example about arrangement | positioning of the to-be-treated water distribution port in a to-be-treated water reservoir. Explanatory drawing which shows the other example about arrangement | positioning of the to-be-treated water distribution port in a to-be-treated water reservoir. Explanatory drawing which shows the other example about arrangement | positioning of the to-be-treated water distribution port in a to-be-treated water reservoir. Explanatory drawing which shows the other example about arrangement | positioning of the to-be-treated water distribution port in a to-be-treated water reservoir. Explanatory drawing which shows an example of the connection of each reverse osmosis membrane module and a water supply reservoir.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water purification apparatus 3 ... To-be-processed water supply means 5 ... Pressure pump 7 ... To-be-processed water reservoir 9 ... To-be-processed water distribution port 11 ... Reverse osmosis membrane module 13 ... Purified water supply means 15 ... Drainage means 19 ... microfiltration filter 21 ... adsorption filtration filter 33 ... water supply reservoir 41 ... final adsorption filtration filter 45 ... drainage reservoir

Claims (7)

Treated water supply means for supplying treated water;
A pump for adjusting the supply water pressure of the treated water;
A treated water reservoir into which treated water pressurized by this pump is introduced,
A plurality of treated water distribution ports for distributing treated water from the reservoir;
A plurality of reverse osmosis membrane modules each having a reverse osmosis membrane for introducing the treated water distributed from each treated water distribution port and treating the treated water;
Purified water supply means for supplying purified water obtained through the reverse osmosis membrane;
Drainage means for discharging unpurified water that does not pass through the reverse osmosis membrane;
A water purification apparatus comprising:   The water purification apparatus of Claim 1 whose water pressure of the to-be-processed water distributed from the said to-be-processed water distribution port is 0.5 Pa or less.   The water purification apparatus according to claim 1 or 2, wherein the treated water reservoir is substantially cylindrical and the treated water distribution port is substantially circular.   The water purification apparatus according to claim 3, wherein the treated water distribution port is provided non-uniaxially on a cylindrical surface of the treated water reservoir.   The water purification apparatus according to claim 3 or 4, wherein a cross-sectional opening area substantially perpendicular to a longitudinal direction in the treated water reservoir is larger than a total opening area of the plurality of treated water distribution ports.   The water purification apparatus according to claim 5, wherein a diameter of the treated water reservoir is larger than a sum of diameters of the plurality of treated water distribution ports.   The drainage means includes a drainage reservoir that temporarily collects the non-purified water discharged from the plurality of reverse osmosis membrane modules before discharging out of the apparatus. Water purification equipment.

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