Water purifying device

Abstract

To provide a small-sized water purifying device capable of safely decomposing and sterilizing an organic matter and capable of instantly utilizing treated water.SOLUTION: A water purifying device 1 includes a filtration section 10 that uses a filtration material to remove a material to be treated from water to be treated that contains the material to be treated and produces purified water, an ozone generation section 7 that generates ozone gas by electrolysis of water, a cleaning water generation section 9 that mixes ozone gas with the water to be treated or purified water to produce cleaning water, and a control section 3 that supplies cleaning water to the filtration section 10 when cleaning a filtration material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a water purification device.

Background Art

[0002] Conventionally, as a water treatment method for removing impurities in water, physical filtration using activated carbon or sand as a filter medium is known. In a water purification device using a filter medium, since impurities, particularly organic substances, tend to accumulate in the filter medium, it is necessary to perform cleaning regularly to discharge the organic substances to the outside.

[0003] However, organic substances with a small molecular weight are adsorbed into the pores of the filter medium and are thus difficult to be discharged even after cleaning. In addition, in the case of a household water treatment device, the cleaning operation is not performed due to a long absence, and the accumulation time of organic substances in the filter medium becomes long. When the accumulation time becomes long, the adsorbed and accumulated organic substances serve as a nutrient source, and bacteria such as Legionella bacteria are generated and propagated in the filter medium, and there is a problem that they infect humans. In order to decompose such organic substances contained in the water to be treated or the treated water and to sterilize the propagated bacteria, a decomposition and sterilization method using ozone is known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the water treatment system disclosed in Patent Document 1, by combining an ozone supply device and a water treatment device, decomposition and sterilization of organic substances can be performed. However, since the ozone supply device is of a discharge type, the device tends to be enlarged, and in addition, since it is necessary to combine a time balance tank for ozone removal, there is a problem that the entire water treatment system becomes even larger.

[0006] In addition, when ozone removal by the ozone treatment device is not possible or is insufficient, the treated water may contain ozone, which may have an adverse health effect on the users of the treated water.

[0007] Furthermore, in the time balance tank, since it is necessary to temporarily store the treated water and perform ozone removal, there are problems that the treated water cannot be used immediately, and when a large amount of water is desired to be used, a large time balance tank is required, further increasing the size of the entire device.

[0008] Therefore, the present invention solves the above-mentioned conventional problems, and aims to provide a small water purification device that can safely decompose organic substances and sterilize, and can immediately use the treated water.

Means for Solving the Problems

[0009] And, in order to achieve this object, the water purification device according to the present invention includes a filtration unit that removes the object to be treated from the treated water containing the object to be treated by a filter medium to generate purified water, an ozone generation unit that generates ozone gas by electrolysis of water, a washing water generation unit that mixes ozone gas into the treated water or the purified water to generate washing water, and a control unit that supplies the washing water to the filtration unit when washing the filter medium, thereby achieving the intended purpose.

Effects of the Invention

[0010] According to the present invention, it is possible to provide a small water purification device that can safely decompose organic substances and sterilize, and can immediately use the treated water.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following embodiments are examples of embodying the present invention and do not limit the technical scope of the present invention. Also, each drawing described in the embodiments is a schematic diagram, and the ratio of the size and thickness of each component in each drawing does not necessarily reflect the actual dimensional ratio.

[0013] (Embodiment 1) ((Overall Configuration)) Referring to FIG. 1, the water purification device 1 according to the present embodiment will be described. FIG. 1 is a schematic diagram of the water purification device 1 according to the present embodiment.

[0014] As shown in FIG. 1, the water purification device 1 is a device that purifies treated water containing impurities such as organic substances and bacteria as treatment objects, which is sent from a water purification plant or the like via a water supply pipe 2 or the like, and makes it usable as domestic water. The water purification device 1 purifies the treated water and cleans the filter material by executing each mode of a filtration mode, a treated water backwash mode, and an ozone water backwash mode. Details of each mode will be described later. Note that the treated water backwash mode and the ozone water backwash mode are collectively referred to as the backwash mode. The water purification device 1 includes an inlet 21, a control unit 3, an ozone generation unit 7, a washing water generation unit 9, a filtration unit 10, a measurement unit 20, a purified water discharge port 27, and a backwash discharge port 29.

[0015] The inlet 21 is an opening that introduces the treated water pumped from the outside of the water purification device 1 such as a water purification plant via the water supply pipe 2 into the water purification device 1. The inlet 21 is provided in the housing constituting the water purification device 1 and is communicatively connected to an inflow pipe 22 described later.

[0016] The control unit 3 controls the switching of the flow path of the water to be treated flowing through the water purification device 1 in each of the filtration mode, the reverse washing mode of the water to be treated, and the reverse washing mode of the ozone water. The specific switching of the flow path by the control unit 3 in each mode will be described later. As hardware, the control unit 3 can be realized by elements and mechanical devices including a computer's CPU (Central Processing Unit), and as software, it can be realized by a computer program or the like. Therefore, these functional blocks can be realized in various forms by a combination of hardware and software. The control unit 3 is connected to the ozone generation unit 7, the washing water generation unit 9, the upstream switching valve 5, the constant flow valve 24, the three-way valve 25, the switching valve 11, and the measurement unit 20 by wire or wirelessly, and controls the operation of each component.

[0017] The ozone generation unit 7 is a device that takes in the water to be treated and generates ozone gas by performing electrolysis with electrodes. The ozone generation unit 7 is communicatively connected to a second water supply pipe 23b described later, and a washing water generation unit 9 is provided on the downstream side of the ozone generation unit 7.

[0018] The washing water generation unit 9 is a device that generates washing water by mixing the ozone gas generated by the ozone generation unit 7 into the water to be treated. In the washing water generation unit 9, instead of the water to be treated, it is also possible to mix ozone gas into the purified water generated by a filtration unit 10 described later to generate washing water. In this case, piping or the like for supplying the generated purified water to the washing water generation unit 9 is provided. The filtration unit 10 generates purified water by capturing and separating and removing substances to be treated such as organic substances or bacteria contained in the water to be treated with a filtration material 19 provided inside. The filtration unit 10 is communicatively connected to a third water supply pipe 23c, a water guide pipe 15, a purified water discharge pipe 26, and a reverse washing discharge pipe 28, respectively.

[0019]

[0020] ​Above the filtration section 10 vertically, a switching valve 11 and an opening 13 at one end are provided. Inside the filtration section 10, a water conduit 15 and a filter medium 19 are provided.

[0021] The switching valve 11 is a valve that switches the water supply destination of the water flowing into the filtration section 10 and the water sent out from the filtration section 10 according to the operation mode of the water purification device 1. The switching valve 11 is respectively communicatively connected to the third water supply pipe 23c, the opening 13 at one end, the water conduit 15, the purified water discharge pipe 26, and the backwash discharge pipe 28. The switching valve 11 is communicatively connected to the control unit 3 wirelessly or by wire, and the water supply destination is switched by a signal from the control unit 3.

[0022] The opening 13 at one end is, in the filtration mode, connected to the end of the third water supply pipe 23c so as to be water-suppliable by switching the switching valve 11, and is an opening for introducing the water to be treated flowing through the third water supply pipe 23c into the filtration section 10. Further, the opening 13 at one end is, in the water to be treated backwash mode and the ozone water backwash mode, connected to the end of the backwash discharge pipe 28 so as to be water-suppliable by switching the switching valve 11, and is an opening for sending the water in the filtration section 10 to the backwash discharge pipe 28. The opening 13 at one end corresponds to the opening 17 at the other end described later, and is provided vertically above the opening 17 at the other end.

[0023] The filter medium 19 is a substance that captures substances to be treated such as organic substances or bacteria contained in the water to be treated. As the filter medium 19, for example, activated carbon, filter sand, zeolite, or ceramic can be used. The filter medium 19 is provided below the filtration section 10, and there is a space above the filter medium 19 inside the filtration section 10. By providing this space, the backwash efficiency in the backwash mode is improved.

[0024] The water conduit 15 is provided within the filtration section 10 and is a pipe that connects from the upper part to the lower part within the filtration section 10. An other-end-side opening 17 is provided at its lower end. During the filtration mode by the water conduit 15, the water to be treated that has flowed into the filtration section 10 is sent from the upper part to the lower part of the filtration section 10. During the backwash mode of the water to be treated and the ozone water backwash mode, the water used for cleaning the filter medium 19 within the filtration section 10 is sent from the lower part of the filtration section 10 to the upper part of the filtration section 10 and then sent out of the filtration section 10.

[0025] The other-end-side opening 17 is buried in the filter medium 19 and is provided vertically below the one-end-side opening 13. The other-end-side opening 17 is an opening for supplying the water within the water conduit 15 into the filtration section 10 or for supplying the water within the filtration section 10 into the water conduit 15.

[0026] In the water conduit 15, the lower part including the other-end-side opening 17 is buried in the filter medium 19, while the upper part is not buried in the filter medium 19 and is connected to the switching valve 11. That is, the water conduit 15 is a pipe for supplying the water sent from the switching valve 11 to the filter medium 19 existing in the lower part within the filtration section 10 or for supplying the water within the filtration section 10 from the lower part of the filtration section 10 to the switching valve 11.

[0027] The measurement section 20 is provided on the purified water discharge pipe 26 described later and is a device for measuring the water quality of the purified water generated by purification in the filtration section 10. As the measurement section 20, for example, a COD meter (Chemical Oxygen Demand) can be used.

[0028] The purified water discharge port 27 is an opening for taking out the water to be treated filtered by the water purification device 1 as purified water (treated water) outside the water purification device 1. The purified water discharge port 27 is provided on the housing constituting the water purification device 1 and is connected in communication with the purified water discharge pipe 26 described later.

[0029] The backwash discharge port 29 is an opening for discharging the water to be treated or the washing water used for cleaning the filtration section 10 outside the water purification device 1. The backwash discharge port 29 is an opening provided on the housing constituting the water purification device 1 and is connected in communication with the backwash discharge pipe 28.

[0030] ((Flow path and valve)) The flow path of the water purification device 1 is composed of an inflow pipe 22, a first water supply pipe 23a, a second water supply pipe 23b, a third water supply pipe 23c, a purified water discharge pipe 26, and a backwash discharge pipe 28.

[0031] The inflow pipe 22 is communicatively connected to the inflow port 21 and the upstream switching valve 5, and is a pipe that supplies the water to be treated taken into the water purification device 1 from the inflow port 21 to the upstream switching valve 5.

[0032] The upstream switching valve 5 is a valve that switches the water supply destination so that water is supplied from the inflow pipe 22 to either the first water supply pipe 23a or the second water supply pipe 23b. As the upstream switching valve 5, for example, a three-way electric valve can be used. The upstream switching valve 5 is communicatively connected to the control unit 3 wirelessly or by wire, and the water supply destination is switched by a signal from the control unit 3.

[0033] From the upstream switching valve 5 to the filtration unit 10, it is connected by the first water supply pipe 23a, the second water supply pipe 23b, and the third water supply pipe 23c.

[0034] The first water supply pipe 23a is a pipe that communicatively connects from the upstream switching valve 5 to a branch point B described later, and is used in the filtration mode and the raw water backwash mode.

[0035] The second water supply pipe 23b is a pipe that communicatively connects from the upstream switching valve 5 to a branch point B described later, and is used in the ozone water backwash mode. A constant flow valve 24, an ozone generation unit 7, and a washing water generation unit 9 are provided on the second water supply pipe 23b.

[0036] The constant flow valve 24 is a valve that makes the flow rate of the water to be treated sent to the ozone generation unit 7 constant during the operation in the ozone water backwash mode, and is communicatively connected to the second water supply pipe 23b.

[0037] The third water supply pipe 23c is a pipe that communicatively connects from a branch point B, which will be described later, to one end opening 13 of the filtration unit 10, and is used during the filtration mode, the raw water backwash mode, and the ozone water backwash mode.

[0038] The downstream end of the inflow pipe 22, the upstream end of the first water supply pipe 23a, and the upstream end of the second water supply pipe 23b are respectively connected, and the connection point is the branch point A. An upstream switching valve 5 is provided on the branch point A.

[0039] The downstream end of the first water supply pipe 23a, the downstream end of the second water supply pipe 23b, and the upstream end of the third water supply pipe 23c are respectively connected, and the connection point is the branch point B. A three-way valve 25 is provided on the branch point B.

[0040] The three-way valve 25 is a valve that switches the water supply source so that water is supplied from either the first water supply pipe 23a or the second water supply pipe 23b to the third water supply pipe 23c. The three-way valve 25 is communicatively connected to the control unit 3 wirelessly or by wire, and the water supply destination is switched by a signal from the control unit 3.

[0041] The purified water discharge pipe 26 is communicatively connected to the switching valve 11 and the purified water discharge port 27, and is a pipe that supplies the raw water from which organic substances, bacteria, etc. have been removed in the filtration unit 10 to the purified water discharge port 27. A measurement unit 20 is provided on the purified water discharge pipe 26.

[0042] The backwash discharge pipe 28 is communicatively connected to the switching valve 11 and the backwash discharge port 29, and is a pipe that supplies the raw water or the washing water used for washing the filtration unit 10 to the backwash discharge port 29. The above is the configuration of the water purification device 1.

[0043] Next, the operation of the water purification device 1 will be described.

[0044] First, with reference to FIG. 2, the operation during the filtration mode by the water purification device 1 will be described. FIG. 2 is a schematic diagram during the filtration mode according to the present embodiment.

[0045] In the water purification device 1, in the filtration mode, under the control of the control unit 3, the upstream switching valve 5 is in a state of communicating the inflow pipe 22 and the first water supply pipe 23a, the three-way valve 25 is in a state of communicating the first water supply pipe 23a and the third water supply pipe 23c, and the switching valve 11 is in a state of communicating the third water supply pipe 23c and the one-end side opening 13. As a result, the water to be treated containing impurities flows into the water purification device 1 from the outside, and circulates in the order of the inlet 21, the inflow pipe 22, the upstream switching valve 5, the first water supply pipe 23a, the three-way valve 25, the third water supply pipe 23c, and the switching valve 11. In other words, the purification flow path is formed by the inflow pipe 22, the first water supply pipe 23a, the third water supply pipe 23c, and the switching valve 11, and the water to be treated circulates through the purification flow path. The water to be treated that has passed through the switching valve 11 flows into the filtration unit 10 from the one-end side opening 13 and circulates through the filter medium 19 provided in the filtration unit 10. At this time, the impurities in the water to be treated are adsorbed by the filter medium 19, and the water to be treated is filtered. The purified water generated by filtering the water to be treated circulates through the purified water discharge pipe 26 and is sent out of the water purification device 1 from the purified water discharge port 27.

[0046] When the execution time of the filtration mode exceeds a certain time (for example, 4 hours) or the treated water volume exceeds a certain water volume (for example, 7000 L), the control unit 3 ends the filtration mode and executes the backwashing mode of the water to be treated.

[0047] Next, with reference to FIG. 3, the operation of the water purification device 1 in the backwashing mode of the water to be treated will be described. FIG. 3 is a schematic diagram of the backwashing mode of the water to be treated according to the present embodiment.

[0048] In the water purification device 1, in the raw water backwashing mode, under the control of the control unit 3, the upstream switching valve 5 is in a state of communicating the inflow pipe 22 and the first water supply pipe 23a, the three-way valve 25 is in a state of communicating the first water supply pipe 23a and the third water supply pipe 23c, and the switching valve 11 is in a state of communicating the third water supply pipe 23c and the water guide pipe 15. As a result, raw water flows into the water purification device 1 from the outside and circulates in the order of the inlet 21, the inflow pipe 22, the upstream switching valve 5, the first water supply pipe 23a, the three-way valve 25, the third water supply pipe 23c, the switching valve 11, and the water guide pipe 15. In other words, the cleaning flow path is formed by the inflow pipe 22, the first water supply pipe 23a, the third water supply pipe 23c, and the water guide pipe 15, and the raw water circulates through the cleaning flow path. The raw water that has passed through the water guide pipe 15 flows into the filtration unit 10 from the other end opening 17 of the filtration unit 10 and circulates through the filter medium 19 provided in the filtration unit 10. That is, it flows into the filtration unit 10 from the end opposite to that in the filtration mode. The inflowing raw water removes the substances adsorbed between the holes of the filter medium 19 and between the filter media 19 by passing through the holes of the filter medium 19 and between the filter media 19. In this way, the raw water flowing in from the lower part of the filtration unit 10 is sent to the upper part of the filtration unit 10 while cleaning the internal filter medium 19, and is sent to the backwashing discharge pipe 28 via the switching valve 11. Thereafter, the raw water circulates through the backwashing discharge pipe 28 and is drained out of the water purification device 1 from the backwashing discharge port 29.

[0049] When the execution time of the raw water backwashing mode exceeds a certain time (for example, 2 minutes), the control unit 3 ends the raw water backwashing mode and executes the ozone water backwashing mode.

[0050] Next, with reference to FIG. 4, the operation of the water purification device 1 in the ozone water backwashing mode will be described. FIG. 4 is a schematic diagram of the ozone water backwashing mode according to the present embodiment.

[0051] In the water purification device 1, in the ozone water backwashing mode, under the control of the control unit 3, the upstream switching valve 5 is in a state of communicating the inflow pipe 22 and the second water supply pipe 23b, the three-way valve 25 is in a state of communicating the second water supply pipe 23b and the third water supply pipe 23c, and the switching valve 11 is in a state of communicating the third water supply pipe 23c and the water conduit 15. As a result, the water to be treated flows into the water purification device 1 from the outside, passes through the inlet 21, the inflow pipe 22, the upstream switching valve 5, the second water supply pipe 23b, and the constant flow valve 24, and flows into the ozone generation unit 7. The water to be treated that has flowed into the ozone generation unit 7 is electrolyzed by a pair of electrodes (anode and cathode) provided inside the ozone generation unit 7, and ozone gas is generated by this electrolysis. The water to be treated containing ozone gas flows into the washing water generation unit 9, and the ozone gas dissolves in the water to be treated, resulting in washing water containing ozone. The washing water generated in the washing water generation unit 9 flows in the order of the three-way valve 25, the third water supply pipe 23c, the switching valve 11, and the water conduit 15. The washing water that has flowed through the water conduit 15 flows into the filtration unit 10 from the other end opening 17 of the filtration unit 10 and passes through the filter medium 19 provided in the filtration unit 10. That is, it flows into the filtration unit 10 from the end opposite to that in the filtration mode. The flowing-in washing water passes through the holes of the filter medium 19 and between the filter media 19, thereby removing the substances to be treated adsorbed to the holes of the filter medium 19 and between the filter media 19 and performing sterilization by ozone. In this way, the washing water flowing in from the lower part of the filtration unit 10 is sent to the upper part of the filtration unit 10 while washing the internal filter medium 19, and is sent to the backwashing discharge pipe 28 via the switching valve 11. Thereafter, the washing water flows through the backwashing discharge pipe 28 and is drained out of the water purification device 1 from the backwashing discharge port 29.

[0052] When the execution time of the ozone water backwashing mode exceeds a certain time (for example, 3 minutes), the control unit 3 ends the ozone water backwashing mode and enters a standby state where it executes the filtration mode or waits to execute the filtration mode.

[0053] As described above, in the water purification device 1, the filtration mode, the water to be treated backwashing mode, and the ozone water backwashing mode are repeatedly executed. In other words, the generation of purified water by the filtration unit 10 and the regeneration of the filtration unit 10 are repeatedly executed.

[0054] In the operation of the water purification device 1, in many cases, the total amount of the water to be treated or the washing water passed through the filtration unit 10 in the water to be treated reverse washing mode and the ozone water reverse washing mode is less than the amount of the water to be treated passed through the filtration unit 10 in the filtration mode. In other words, the amount of water passed through the filtration unit 10 during the regeneration of the filter medium 19 is less than the amount of water passed through the filtration unit 10 during the generation of purified water. However, depending on the usage environment of the water purification device 1, there may be a case where the amount of water passed through the filtration unit 10 in the filtration mode is equal to or more than the total amount of water passed through the filtration unit 10 in the water to be treated reverse washing mode and the ozone water reverse washing mode. Further, the ozone water reverse washing mode is executed such that the total amount of ozone water passed through the filtration unit 10 in the ozone water reverse washing mode is at least the same volume as the volume of the filter medium 19.

[0055] As described above, according to the water purification device 1 according to the present embodiment, the following effects can be obtained.

[0056] (1) The water purification device 1 includes a filtration unit 10 that removes a substance to be treated from the water to be treated containing the substance to be treated by the filter medium 19 to generate purified water, an ozone generation unit 7 that generates ozone gas by electrolyzing water, a washing water generation unit that mixes ozone gas with the water to be treated or purified water to generate washing water, and a control unit 3 that feeds the washing water to the filtration unit 10 during the washing of the filter medium 19. According to such a configuration, when the filtration unit 10 is reversely washed, it can be washed with ozone water, which is washing water containing ozone, to decompose organic substances accumulated in the filter medium 19 and perform sterilization. Further, since ozone is generated by electrolyzing water, it is possible to generate ozone with a device that is more compact than ozone generation by a discharge method, and the device can be miniaturized.

[0057] (2) In the water purification device 1, the control unit 3 feeds the water to be treated to the filtration unit 10 before feeding the washing water. Thereby, after discharging the substance to be treated accumulated in the filter medium 19 to the outside of the water purification device with the water to be treated, the filtration unit 10 can be washed with the washing water. Therefore, it is possible to efficiently decompose organic substances and perform sterilization.

[0058] (3) The water purification device 1 includes a purification flow path for sending the water to be treated to the one - end opening 13 provided on one end side of the filtration unit 10, and a cleaning flow path for sending the water to be treated to the other - end opening 17 provided on the other end side corresponding to the one - end side of the filtration unit 10. When generating purified water by the filtration unit 10, the water purification device 1 sends the water to be treated from the one - end opening 13 to the filtration unit through the purification flow path, and when regenerating the filter medium 19, the water purification device 1 sends the water to be treated from the other - end opening 17 to the filtration unit 10 through the cleaning flow path. According to such a configuration, since the mixing of the purified water generated in the filtration mode and the backwash drainage generated in the water - to - be - treated reverse - wash mode can be suppressed, it is possible to obtain purified water that does not contain impurities.

[0059] (4) The water purification device 1 includes a purification flow path for sending the water to be treated to the one - end opening 13 provided on one end side of the filtration unit 10, and a cleaning flow path for sending the water to be treated to the other - end opening 17 provided on the other end side corresponding to the one - end side of the filtration unit 10. When generating purified water by the filtration unit 10, the water purification device 1 sends the water to be treated from the one - end opening to the filtration unit through the purification flow path, and when regenerating the filter medium 19, the water purification device 1 sends cleaning water from the other - end opening 17 to the filtration unit 10 through the cleaning flow path. According to such a configuration, since the mixing of the purified water generated in the filtration mode and the cleaning water generated in the ozone - water reverse - wash mode can be suppressed, it is possible to obtain purified water that can suppress the occurrence of health hazards caused by ozone.

[0060] (5) In the water purification device 1, the one - end opening 13 is provided vertically above the filtration unit 10, and the other - end opening 17 is provided vertically below the one - end opening 13. According to such a configuration, in the filtration mode, since the filtration of the water to be treated can be performed using gravity, it is possible to improve the purification efficiency of the water to be treated. Also, in the water - to - be - treated reverse - wash mode and the ozone - water reverse - wash mode, by utilizing the buoyancy of the water to be treated and the cleaning water sent from below, the substances to be treated accumulated on the filter medium 19 can be efficiently cleaned and discharged outside the water purification device 1.

[0061] (6) In the water purification device 1, when the filter medium 19 is regenerated, washing water with at least the same volume as the volume of the filter medium 19 is passed through the filtration unit 10. According to such a configuration, the treatment products accumulated in the filter medium 19 can be efficiently discharged outside the water purification device 1. In addition, in the case of ozone water, since the decomposition of organic substances and sterilization of the organic substances accumulated in the filter medium 19 can be performed simultaneously, backwashing can be performed without wasting time and water volume.

[0062] In the first embodiment, the washing water generation unit 9 is provided on the downstream side of the ozone generation unit 7, but the present invention is not limited to this. For example, a housing integrating the ozone generation unit 7 and the washing water generation unit 9 may be provided. In the housing, a plate-shaped anode, a plate-shaped cathode, and a conductive film provided between the anode and the cathode are provided from the upstream side to the downstream side. In this case, the water to be treated is allowed to flow into the housing, and the electrolysis of the water to be treated is performed by the anode and the cathode. Then, in the housing, the ozone gas generated by the electrolysis of the water to be treated on the upstream side is immediately mixed with the water to be treated as soon as it is generated. As a result, washing water with an increasing ozone gas concentration can be generated as it goes downstream of the housing.

Industrial Applicability

[0063] The water purification device according to the present invention can be applied to a point-of-use water purification device (POU) or a point-of-entry water purification device (POE) installed at the building entrance.

Explanation of Reference Numerals

[0064] 1 Water purification device 2 Water supply pipe 3 Control unit 5 Upstream switching valve 7 Ozone generation unit 9 Washing water generation unit 10 Filtration unit 11 Switching valve 13 One-end opening 15 Water conduit 17 The other-end opening 19 Filter medium 20 Measurement unit 21 Inlet 22 Inlet pipe 23a First water supply pipe 23b Second water supply pipe 23c Third water supply pipe 24 Constant flow valve 25 Three-way valve 26 Purified water discharge pipe 27 Purified water discharge outlet 28 Backwash discharge pipe 29 Backwash discharge outlet A Branch point B Branch point

Claims

1. A filtration unit that removes the object to be treated from the water to be treated containing the object to be treated by a filter medium to generate purified water; An ozone generation unit that generates ozone gas by electrolysis of water; A washing water generation unit that mixes the ozone gas into the water to be treated or the purified water to generate washing water; A water purification device comprising a control unit that controls the supply of the washing water to the filtration unit during washing of the filter medium.

2. The water purification device according to claim 1, wherein the control unit supplies the water to be treated to the filtration unit before supplying the washing water.

3. A purification flow path that supplies the water to be treated to an opening on one end side provided on one end side of the filtration unit; A washing flow path that supplies the water to be treated to an opening on the other end side provided on the other end side corresponding to the one end side of the filtration unit, When the purified water is generated by the filtration unit, the water to be treated is supplied from the opening on the one end side to the filtration unit through the purification flow path, The water purification device according to claim 2, wherein when the filter medium is regenerated, the water to be treated is supplied from the opening on the other end side to the filtration unit through the washing flow path.

4. A purification flow path that supplies the water to be treated to an opening on one end side provided on one end side of the filtration unit; A washing flow path that supplies the water to be treated to an opening on the other end side provided on the other end side corresponding to the one end side of the filtration unit, When the purified water is generated by the filtration unit, the water to be treated is supplied from the opening on the one end side to the filtration unit through the purification flow path, The water purification device according to claim 1, wherein when the filter medium is regenerated, the washing water is supplied from the opening on the other end side to the filtration unit through the washing flow path.

5. The opening on the one end side is provided vertically above the filtration unit, The water purification device according to claim 3 or 4, wherein the opening on the other end side is provided vertically below the opening on the one end side.

6. During regeneration of the filter medium, The water purification device according to claim 1, wherein at least the same volume of the washing water as the volume of the filter medium is passed through the filtration unit.

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