KR101967799B1 - Water treatment apparatus and water treatment method - Google Patents

Abstract

The present invention minimizes the area of the dead zone that is not sterilized in the water treatment apparatus, sterilizes the inside of the plurality of storage tanks uniformly, and uses piping connecting the tanks with high heat-resistant materials There is a need to provide a water treatment apparatus and a water treatment method capable of reducing manufacturing cost and minimizing waste of water by generating sterilized water by using waste water discharged from a reverse osmotic membrane filter, There is a purpose. The water treatment apparatus of the present invention for realizing this comprises a plurality of storage tanks for storing the water filtered at the filter unit at different temperatures, respectively; A plurality of intake valves provided at the front end of the intake port for leaving the plurality of storage tank water respectively; A water outlet connecting passage for connecting the plurality of intake valves to each other; And a sterilizing module for generating sterilizing water in the sterilizing mode to supply the sterilizing water to the plurality of storage tanks and the outlet connecting channel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment apparatus and a water treatment method,

The present invention relates to a water treatment apparatus and a water treatment method, and more particularly, to a water treatment apparatus and a water treatment method capable of sterilizing a water tank and an inside of a pipe using sterile water.

The conventional water purifier includes a raw water valve for controlling the supply of raw water such as tap water and natural water, a pretreatment sedimentation filter for filtering the debris in the raw water that has passed through the raw water valve, A post-carbon filter for removing chlorine components and odors contained in purified water passing through the pre-carbon filter, and a hollow fiber filter for removing bacteria and other fine particles contained in purified water passing through the post- And a water tank for storing purified water that has passed through the hollow fiber membrane filter.

In general, in the water treatment plant, a chlorine-based sanitizing disinfectant is administered to suppress the growth of microorganisms in the water. While the tap water to which the sanitizing disinfectant is administered passes through the water purifier, chlorine is removed from the free carbon filter and the post- .

Since the chlorine component that suppresses the growth of microorganisms is removed by the filter, the purified water stored in the water tank is not used immediately by the consumer, and bacteria proliferate inside the water tank after a long time elapses Various methods have been proposed for the sterilization of these water tanks.

For example, Korean Patent Registration No. 10-621937 discloses a technique for sterilizing the inside of a purified water tank by providing an electrolytic sterilizing means between the filter portion and the purified water tank for sterilizing purified water by electrolysis and producing an oxidizing mixed material.

However, in such a water treatment apparatus, a water intake valve is provided at the front end of the intake port for supplying purified water to the user. When the user does not use the water stored in the water purification tank for a long time, In the disinfection system disclosed in the prior art, only the inside of the purified water tank is sterilized and the inside of the pipe connected to the water intake valve can not be sterilized, so that a dead zone (Dead Zone is formed.

In addition, since sterilization water generated in the electrolytic sterilization means is first filled in the cold water tank and the hot water tank, the sterilizing time is long and the water tank is filled at the end, so that the sterilization time is shortened, There is a problem that imbalance occurs.

In addition, when hot water in the hot water tank flows directly into a pipe connecting between the respective tanks, there is a problem in heat resistance of the pipe. Therefore, when a material having high heat resistance is used for the pipe, the cost of the product is increased.

In addition, when the reverse osmosis membrane filter is provided in the filter unit, the dissolved ionic material contained in the raw water is removed while passing through the reverse osmosis membrane filter, so that a sufficient amount of sterilizing material may not be generated during passage through the electrolytic sterilizing unit. The ratio of the amount of water discharged to the wastewater and the amount of water to be purified become 8: 2 in the raw water obtained by the reverse osmosis membrane filter.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a water treatment apparatus capable of minimizing the area of the dead zone not sterilized in the water treatment apparatus, uniformly sterilizing a plurality of storage tanks, It is not necessary to use a high-priced material having high heat resistance for piping, and the manufacturing cost can be reduced.

In addition, when a reverse osmosis membrane filter is provided, it is desired to provide a water treatment apparatus and a water treatment method capable of minimizing waste of water and improving sterilization efficiency by generating sterilized water using waste water discarded in an reverse osmosis membrane filter, There is a purpose.

According to an aspect of the present invention, there is provided a water treatment apparatus comprising: a plurality of storage tanks for storing filtered water at different temperatures; A plurality of intake valves provided at the front end of the intake port for leaving the plurality of storage tank water respectively; A water outlet connecting passage for connecting the plurality of intake valves to each other; And a sterilizing module for generating sterilizing water in the sterilizing mode to supply the sterilizing water to the plurality of storage tanks and the outlet connecting channel.

Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank; A circulation channel connected to circulate the water discharged from the first storage tank to the first storage tank through the second storage tank and a circulation channel connected to the water discharged from the first storage tank and the second storage tank through the circulation channel A circulation pump for circulation can be provided.

Wherein the plurality of storage tanks comprise a first storage tank consisting of an upper space for storing room temperature water and a lower space for storing cold water and a second storage tank connected to the first storage tank; Wherein the plurality of intake valves include a cold water intake valve and a hot water intake valve for supplying cold water and hot water to the user, respectively; A circulation channel connected to circulate water discharged from the first storage tank to the first storage tank through the second storage tank includes a cold water intake line for connecting the lower space and the cold water intake valve, And a hot water intake line connecting the upper part of the storage tank and the hot water intake valve.

Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank; A first connection line connecting the first storage tank and the second storage tank; And a first connection line shutoff valve may be provided on the first connection line to shut off the connection between the first storage tank and the second storage tank.

Wherein the plurality of intake valves are connected to one intake port, and a water intake shutoff valve is provided between the intake port and the plurality of intake valves; The outflow connection channel may connect the water intake shutoff valve and the plurality of intake valves.

The filter portion may include an inverse osmotic membrane filter and produce sterile water in the sterilization module using wastewater discharged from the reverse osmosis membrane filter.

Wherein the first storage tank comprises an upper space for storing water at room temperature and a lower space for storing cold water; Wherein the circulation channel includes a circulation line connected to allow water discharged from the second storage tank to flow into the first storage tank, a first connection line connecting between the upper space and the circulation line, And a second connection line connecting between the lines; In the sterilization mode, water in the lower space is supplied to the circulation line through the second connection line, and water in the upper space flows into the second storage tank through the first connection line, Mixed with water and then supplied to the circulation line.

The plurality of intake valves and the water outlet connecting passage may be integrally coupled to one body.

The water treatment method of the present invention comprises the steps of: a) storing the filtered water in a plurality of storage tanks at different temperatures, respectively; b) supplying sterilizing water generated by the sterilizing module to a plurality of intake valves provided at the front end of the intake port to each of the plurality of storage tank water, and connecting the water inlet portion connecting the sterilization water to the plurality of intake valves And sterilizing the plurality of storage tanks and the outlet portion connecting passage by controlling the passage through the passage; and c) draining the sterilized water in the plurality of storage tanks to the outside.

In the step b), the plurality of intake valves may be turned on to allow the sterilization water to flow into the outlet connection channel.

Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank; Wherein the step b) includes circulating the sterilization water through a circulation line connecting the first storage tank and the second storage tank and between the first storage tank and the second storage tank, wherein the first storage tank and the second storage tank Water may be introduced into the circulation line in a mixed state.

According to the present invention, it is possible to sterilize the inside of the piping connected to the plurality of intake valves for supplying water to the user and the outlet connection channel for connecting the plurality of intake valves, thereby minimizing the area of the dead zone .

Also, the water in the first storage tank and the second storage tank is circulated to generate sterilized water, so that the inside of the first storage tank and the inside of the second storage tank can be uniformly sterilized.

In addition, since the water in the first storage tank and the water in the second storage tank are mixed and supplied to the circulation line, hot water is prevented from flowing directly into the circulation line and the circulation pump so that it is not necessary to use a material having high heat resistance, .

Also, the first connection line shutoff valve prevents the hot water in the second storage tank from flowing back to the first storage tank in the normal water take-in mode, thereby preventing energy loss. In sterilization circulation, So that it can be smoothly supplied to the flow path.

In addition, in the sterilization mode, it is possible to generate sterilized water without draining the water in the first storage tank and the second storage tank, so that water can be prevented from being wasted and the time required for sterilization can be shortened.

Also, since the circulation pump is installed at the front of the drain line, the circulation pump can be used for drainage, so that it is possible to drain quickly without having a separate drain pump.

In addition, waste water generated from the reverse osmosis membrane filter can be used to generate sterilized water, thereby minimizing the waste of water and improving the sterilization efficiency by using a dissolved ionic substance contained in the wastewater to produce a high concentration of sterilizing material .

1 is a view showing a configuration of a water treatment apparatus according to a first embodiment of the present invention,
FIG. 2 is a view showing a water outlet in a water treatment apparatus according to a first embodiment of the present invention, FIG.
FIGS. 3, 4, and 5 are views respectively showing a sterilization cycle, a drainage process, and a rinse water inflow process in the water treatment apparatus according to the first embodiment of the present invention.
FIGS. 6 and 7 are views showing sterilization circulation processes and sterilization water drainage processes in a water treatment apparatus according to a second embodiment of the present invention, respectively; FIGS.
8 is a view showing a configuration of a water treatment apparatus according to a third embodiment of the present invention,
FIG. 9, FIG. 10, and FIG. 11 are views showing a drainage process, a process of flowing wastewater, and a process of sterilization in the water treatment apparatus according to the third embodiment of the present invention,
12 and 13 are views showing a sterilization circulation process and a sterilization water drainage process in a water treatment apparatus according to a fourth embodiment of the present invention, respectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

≪ Embodiment 1 >

FIG. 1 is a view showing a configuration of a water treatment apparatus according to a first embodiment of the present invention, and FIG. 2 is a view showing a water outlet unit in a water treatment apparatus according to a first embodiment of the present invention.

The water treatment apparatus according to the first embodiment of the present invention includes a filter unit 100 composed of a plurality of filters 110, 120, 130 and 140 for filtering raw water, a storage unit 200 for storing the filtered water in the filter unit 100, A sterilizing module 300 installed on a circulation line 521 connected to the storage unit 200 to supply sterilized water, a water outlet 400 for taking water stored in the storage unit 200 to the user, .

The filter unit 100 includes a pretreatment sedimentation filter 110, a pre-carbon filter 120, a post-carbon filter 130, and a hollow fiber membrane filter 140. In this case, the order of the post-carbon filter 130 and the hollow fiber membrane filter 140 may be reversed. In the above description, the hollow fiber membrane filter 140 is provided, but the reverse osmosis membrane filter may be provided instead of the hollow fiber membrane filter 140.

A plurality of pipes 501, 502, and 503 are connected to each of the filters 110, 120, 130 and 140 to form a purified water movement line through which purified water moves, and a pre-treatment settling filter 110 and a pre- A raw water valve 150 may be provided on the pipe 501 for controlling the inflow of raw water.

The raw water valve 150 may be installed at the inlet side of the pretreatment sedimentation filter 110. Since the raw water contains a large amount of foreign matter, when the raw water flows directly into the raw water valve 150, It is preferable that the foreign substances contained in the raw water are primarily filtered in the pretreatment sedimentation filter 110 and then passed through the raw water valve 150.

The storage unit 200 stores the filtered water in the filter unit 100 and is connected to the hollow fiber membrane filter 140 by purified water supply lines 504 and 505 to store cold water and purified water. A storage tank 210 and a second storage tank 220 connected to the first storage tank 210 to store hot water.

The first storage tank 210 includes an upper space 210a for storing a constant temperature water and a lower space 210b for storing cold water. The upper space 210a and the lower space 210b are separated by a separation plate 213 and extend downward from the center of the separation plate 213 to penetrate the lower space 210b, And a connection passage 214 for supplying the circulation line 521 without being mixed with cold water.

A cooling coil (not shown) for cooling purified water stored in the lower space 210b is provided on the outer circumference of the lower space 210b. A heater for heating the purified water stored in the outer circumference of the second storage tank 220 Not shown). Of course, the cooling coil and the heater may be provided in the lower space 210b of the first storage tank 210 and the second storage tank 220.

The sterilization module 300, for example, electrolyzes water to react chlorine ions contained in raw water with hydrogen, oxygen, and the like to generate germicidal materials such as HOCl and ClO ^- ions. The sterilizing module 300 includes a positive electrode (not shown) And a negative electrode (not shown). The positive and negative electrodes may be supplied with power by a power supply unit (not shown). The electrodes may be coated with platinum or iridium.

The purified water supplied from the filter unit 100 and the cold water of the first storage tank 210 and the hot water of the second storage tank 220 are supplied to the user through the water intake unit 400. The water intake unit 400 includes a purified water intake valve 410 installed on the purified water intake line 531 connected to the purified water supply line 504 and regulating the supply of purified water, A cold water intake valve 420 installed on the cold water intake line 532 connected to the lower space 210b to regulate the supply of the cold water and a hot water intake line 533 connected to the upper portion of the second storage tank 220 And a water intake shutoff valve 440 for regulating the supply of water having passed through any one of the three intake valves 410, 420 and 430. The water intake shutoff valve 440 is provided in the water intake shutoff valve 430, And a water intake port 450 for supplying water to the user through the water pipe 440.

The water intake shutoff valve 440 is opened together with any one of the three intake valves 410, 420, and 430 at the time of leaving the purified water, the cold water, and the hot water, thereby supplying purified water, cold water, or hot water to the user. The water intake valve 420 and the hot water intake valve 430 are turned off and the purified water intake valve 410 and the water intake shutoff valve 440 are turned on, The purified water supplied through the purified water supply line 504 and the purified water intake line 505 is supplied to the user through the intake port 450. In the same way, The cold water in the lower space 210b and the hot water in the second storage tank 220 are supplied to the user through the intake port 450. [

Meanwhile, the water intake valve 410, the cold water intake valve 420, and the hot water intake valve 430 are connected to each other by an outlet connection channel 455. That is, the outlet connection channel 455 is a channel for interconnecting the purified water intake valve 410, the cold water intake valve 420, and the hot water intake valve 430, The hot water is supplied to the water intake port 450 through the water outlet connection channel 455. The water intake valve 410, the cold water intake valve 420 and the hot water intake valve 430 may be integrally coupled to the body forming the water outlet connection channel 455, (401) can be detachably attached to the water treatment apparatus, so that the structure can be simplified.

In this case, the sterilization circulation path is formed by using the cold water intake valve 420 and the hot water intake valve 430. In the sterilization circulation, the water intake valve 410 and the water intake shutoff valve 440 are turned off, The cold water in the lower space 210b of the first storage tank 210 is discharged through the cold water intake valve 420 as shown in Figure 2 when the cold water intake valve 420 and the hot water intake valve 430 are turned on, And is discharged into the hot water intake valve 430 and flows into the upper portion of the second storage tank 220 via the hot water intake line 533 and is mixed with the hot water.

Meanwhile, a circulating flow path is provided between the first storage tank 210, the second storage tank 220, and the sterilizing module 300 to circulate sterilizing water. In this embodiment, A cold water intake line 532, an outlet connection channel 455, a hot water intake line 533, and a circulation line 521.

One end of the first connection line 511 is connected to the connection passage 214 of the first storage tank 210 and the other end of the first connection line 511 is connected to the circulation line 521, Is supplied to the circulation line 521.

One end of the circulation line 521 is connected to the lower portion of the second storage tank 220 and the other end is connected to the upper portion of the first storage tank 210.

On the circulation line 521, a sterilizing module 300 for generating sterilizing water, a circulation pump 310 for circulating the sterilizing water, a circulation pump for circulating the sterilizing water to the circulation line 521, A drain line 541 for draining the water of the first storage tank 210 and the second storage tank 220 to the outside in the sterilization mode is provided on the circulation line 521, And a flow path switching valve 320 for switching the flow direction is provided at a point where the circulation line 521 and the drain line 541 cross each other.

The cold water in the lower space 210b of the first storage tank 210 during the sterilization circulation flows through the cold water intake line 532 and the water outlet connection channel 455 and the hot water intake line 533, And the mixed water is supplied to the circulation line 521 through the lower portion of the second storage tank 220. [ At the same time, the purified water in the space 210a above the first storage tank 210 is discharged to the circulation line 521 through the first connection line 511 and mixed with the water discharged from the second storage tank 220 The hot water stored in the second storage tank 220 immediately flows into the circulation line 521 and the inner material of the circulation line 521 and the circulation pump 510 It is not necessary to use a material having a high heat resistance, so that the material cost can be reduced.

The sterilization water generated in the sterilization module 300 is filled in the outlet connection channel 455 after sequentially passing through the first storage tank 210, the cold water intake line 532 and the cold water intake valve 420, Since the water is introduced into the second storage tank 220 through the water intake line 533, sterilization is performed up to the front end of the water intake shutoff valve 440 in the sterilization mode, thereby minimizing the area of the dead zone which is not sterilized inside the water treatment system.

On the other hand, the structure of the outlet connecting channel 455 described in FIG. 2 is applied to the remaining embodiments described later.

Each of the drawings showing the operation state of the water treatment apparatus according to the present embodiment indicates that both of On and Off can be performed when the valve is not on or off, The same is true for the example.

The sterilization mode according to the first embodiment of the present invention is performed in the following order: sterilization circulation → sterilization water drain → rinse water inflow → rinse water drain → water inflow order. Hereinafter, referring to FIGS. 3 to 5, The water treatment method in the water treatment apparatus will be described.

FIG. 3 is a view showing sterilization circulation process in the water treatment apparatus according to the first embodiment of the present invention, FIG. 4 is a view showing a sterilization water drainage process in the water treatment apparatus according to the first embodiment of the present invention, FIG. 3 is a view showing a process of inflowing rinse water in the water treatment apparatus according to the first embodiment of FIG.

3, the raw water valve 150, the water intake valve 410 and the water intake shutoff valve 440 are in the off state and the cold water intake valve 420 and the hot water intake valve 420 are in the off state, The circulation line shutoff valve 340 and the circulation line shutoff valve 340 operate the circulation pump 310 and the sterilization module 300 in an on state to circulate the water in the first storage tank 210 and the second storage tank 220 Circulated through the first connection line 511, the cold water intake line 532, the outlet connection channel 455, the hot water intake line 533, and the circulation line 521 to generate sterilized water. In this case, the opening / closing direction of the flow path switching valve 320 is set so that the direction of the sterilizing module 300 communicates with the circulating pump 310, and the flow is blocked to the drain line 541 side.

Here, "Off" means a state in which the valves 150, 340, 410, 420, 430, 440 are closed, or the sterilizing module 300 and the circulation pump 310 are not in operation, and the valves 150, 340, 410, 420, 430, 440, The circulation pump 300 and the circulation pump 310 are operated, and other embodiments described later have the same meaning.

The water flowing through the circulation line 521 is electrolyzed in the sterilization module 300 and then sterilized such as hypochlorous acid (HClO), hypochlorite ion (OCl-), chlorine (Cl ₂ ) The sterilized water flowing into the upper space 210a of the first storage tank 210 is circulated through the connection channel 214 and the first connection line 511, Sterilized water supplied into the lower space 210b communicating with the upper space 210a is filled into the outlet connection channel 455 through the cold water intake line 532 and sterilized The sterilized water filled in the water outlet connecting channel 455 flows into the second storage tank 220 via the hot water intake line 533 and is sterilized while being repeatedly circulated through the circulation line 521.

The circulation pump 310 and the sterilization module 300 may be continuously operated during the circulation process. After the circulation pump 310 and the sterilization module 300 are stopped for a predetermined period of time, Sterilization may be performed inside the first storage tank 210 and the second storage tank 220.

The sterilization water generated by the sterilization module 300 flows into the lower space 210b of the first storage tank 210 by the circulation process and the cold water intake line 532 and the outlet connection channel 455, The hot water is introduced into the second storage tank 220 through the hot water intake line 533 and is simultaneously filled in the first storage tank 210 and the second storage tank 220. Thus, The sterilization operation can be performed uniformly in the first storage tank 210 and the second storage tank 220, since there is no difference in time during which the sterilizing action is performed.

The sterilized water is generated by using the water stored in the first storage tank 210 and the second storage tank 220 without draining the water stored in the first storage tank 210 and the second storage tank 220 , Water can be prevented from being wasted and the time required for sterilization can be shortened.

The purified water intake line 531 is directly connected to the purified water supply line 504 in the present embodiment but the purified water intake line 531 is connected to the upper space 210a of the first storage tank 210, It is possible to sterilize the inside of the purified water intake line 531 by turning on the water intake valve 410 when sterilization is circulated.

After sterilization by the above-mentioned process, sterilized water in the first storage tank 210 and the second storage tank 220 is drained. As shown in FIG. 4, the raw water valve 150, The cold water intake valve 420, the hot water intake valve 430, and the circulation line shutoff valve 340 are turned on, and the water intake valve 420, the water intake shutoff valve 440, and the sterilizing module 300 are turned off, The circulation pump 310 is operated to drain the sterilized water in the first storage tank 210 and the second storage tank 220 to the outside through the drain line 541. In this case, the flow path switching valve 320 is set in the opening / closing direction so that the flow from the circulation pump 310 toward the sterilizing module 300 is blocked and communicated to the drain line 541 side.

As shown in FIG. 5, when the drainage of the sterilized water is completed, a rinsing process for washing the sterilized water remaining in the first storage tank 210 and the second storage tank 220 is performed. The cold water intake valve 420 and the hot water intake valve 430 are turned off while the water intake valve 410, the water intake shutoff valve 440, the sterilization module 300 and the circulation pump 310 are turned off, The raw water is filtered through the filter unit 100 and the filtered water (hereinafter, referred to as "rinsing water") is supplied through the purified water supply lines 504 and 505 to the first The rinsing water introduced into the first storage tank 210 flows into the storage tank 210 through the first connection line 511, the cold water intake line 532, the outlet connection channel 455, 533 to the circulation line 521 and the second storage tank 220 to perform rinsing.

In this case, the rinsing effect can be further improved by circulating the rinsing water along the path shown in FIG. 3 like the circulation of sterilized water or by repeating the rinsing process.

When the rinsing water is filled up to the full water level of the first storage tank 210 and the second storage tank 220, drainage of the rinsing water is performed, and drainage of the rinsing water is performed by the same process as drainage of sterilized water. In this case, the rinsing water is filled up to the full water level, and the rinsing water is drained after the lapse of a predetermined time, thereby further improving the rinsing effect.

When the drainage of the rinsing water is completed, the flow of the purified water is performed. The flow of the purified water is performed by the same process as the flow of the rinsing water, and then the sterilization mode is terminated. In this case, since the inflow of the purified water is not necessary to the circulation line 521, the circulation line shutoff valve 340 of FIG. 5 can be configured to be off.

In the case of the present invention, the drainage can be performed using the circulation pump 310 not only during the circulation of the sterilized water but also in the drainage of the sterilized water and the rinse water, so that the sterilized water and the rinse water can be discharged more smoothly, And two circulation and drainage functions can be implemented by using one circulation pump 310, thereby reducing the cost and efficiently using the interior space of the water treatment apparatus.

The circulation pump 310 can be configured to vary the voltage / current according to a change in the amount of water passing through the circulation pump 310, that is, a change in load, and a load variation detection unit (Not shown) to determine whether the drainage of purified water or sterilized water has been completed.

In addition to the use of the load fluctuation sensing unit, the completion time of the disinfecting water and the rinsing water may be set to be a time for draining the water for a predetermined time, or a separate sensor such as a flow sensor or an infrared sensor may be provided, It is also possible to make a judgment.

The sterilization mode may be set to be repeated automatically at regular intervals, or may be configured to be performed by a user's selection.

≪ Embodiment 2 >

FIG. 6 is a view showing sterilization circulation process in the water treatment apparatus according to the second embodiment of the present invention, and FIG. 7 is a view showing the sterilization water drainage process in the water treatment apparatus according to the second embodiment of the present invention.

In the first connection line 511, hot water of the second storage tank 220 is supplied to the first storage tank 210 in the normal water intake mode, And a first connection line shutoff valve (not shown) for preventing sterilization of the first storage tank 210 from being supplied to the first connection line 511 and the outlet connection channel 455 at the time of sterilization circulation 350 are provided.

First, the operation of the first connection line shutoff valve 350 in the normal water intake mode will be described.

The hot water is stored in the second storage tank 220 and heated using a heater provided in the second storage tank 220 to maintain the temperature of the hot water at a predetermined temperature. The heated water in the second storage tank 220 can flow back to the connection passage 214 of the first storage tank 210 through the first connection line 511. [

When the hot water flows back into the first storage tank 210, the temperature of the cold water in the lower space 210b of the first storage tank 210 rises due to the high temperature of the hot water, The cooling device must be operated in order to keep the cold water temperature in the set range of the temperature.

Accordingly, the first connection line shutoff valve 350 is provided on the first connection line 511, and when the water in the second storage tank 220 is heated, the first connection line shutoff valve 350 is turned off The heated hot water is prevented from flowing back to the first storage tank 210 through the first connection line 511 to prevent energy loss.

When it is necessary to replenish the second storage tank 220 with water as well as when the hot water intake valve 430 is turned on and the hot water is discharged through the intake port 450, The purified water in the upper space 210a of the first storage tank 210 flows into the lower portion of the second storage tank 220 through the first connection line 511. [

6 and 7, the operation state at the time of rinsing and the inflow of purified water is the same as that of the first embodiment, as shown in FIGS. 6 and 7, in the sterilization mode. In this case, the first connection line shutoff valve 350 is turned on to allow water to flow through the first connection line 511, and the water in the second storage tank 220 is heated The first connection line shutoff valve 350 may be turned off.

However, the cold water intake line 532, the outlet connection channel 455, and the hot water intake line 533 are different from the sterilized water passing through the first connection line 511 during the sterilization cycle due to the difference in the flow path resistance of the respective pipes. The first connection line shutoff valve 350 is turned off for a predetermined period of time during the sterilization cycle so that the cold water intake line 532 and the outlet connection channel 455 and the hot water The sterilizing water can flow only through the water intake line 533, so that the sterilizing water can be smoothly supplied to all the circulating flow paths.

≪ Third Embodiment >

FIG. 8 is a view showing a configuration of a water treatment apparatus according to a third embodiment of the present invention. The configuration of the water treatment apparatus according to the third embodiment is the same as that of the water treatment apparatus according to the first embodiment except that the reverse osmosis membrane filter 130-1 Is different from the first embodiment in that wastewater discharged from the reverse osmosis membrane filter 130-1 is supplied to the sterilizing module 300 to generate sterilizing water.

The filter unit 100 includes a reverse osmosis membrane filter 130-1 for removing ionic heavy metals remaining in the raw water that has passed through the pre-carbon filter 120, And a post-carbon filter 140-1 for removing chlorine components and odors contained in one purified water.

The order of the reverse osmosis membrane filter 130-1 and the post-carbon filter 140-1 may be reversed, and the raw water supplied to the reverse osmosis membrane filter 130-1 may be supplied at a predetermined pressure (Not shown in the figure) for supplying the pressurized fluid to the pressurizing unit.

The reverse osmosis membrane filter 130-1 is provided with an inlet 131-1 through which raw water passed through the pre-carbon filter 120 flows, and water filtered by an internal filter member A water outlet 132-1 and a wastewater outlet 133-1 through which the waste water not filtered by the filter member is discharged.

A first waste water line 551 is connected between the waste water outlet 133-1 and the circulation line 521 and a second waste water line 552 is connected between the first waste water line 551 and the drain line 541. [ Lt; / RTI >

The ratio of the wastewater discharged through the wastewater discharge port 133-1 to the purified water discharged through the wastewater discharge port 132-1 is approximately 8: 2. Therefore, in order to reduce the amount of wastewater, the second wastewater line 552 A wastewater regulator 550 for regulating the ratio of water to wastewater is provided.

The wastewater regulator 550 may be configured to block a portion of the water flow path to limit the amount of water passing through the second wastewater line 552 to within a certain range.

A first wastewater line shutoff valve 360 for controlling whether or not wastewater is supplied to the circulation line 521 is provided on the first wastewater line 551. In the sterilization mode, To the circulation line (521).

Some of the wastewater discharged from the reverse osmosis membrane filter 130-1 is drained to the outside through the second wastewater line 552 and the drain line 541 after the discharge amount is adjusted by the wastewater controller 550, Is introduced into the first storage tank 210 and the second storage tank 220 through the circulation line 541 and sterilized by passing through the sterilization module 300 during the sterilization cycle, 2 storage tank 220, a purified water intake line 531, a cold water intake line 532, a hot water intake line 533, a water outlet connection channel 455, a first connection line 511, and a circulation line 521 It is filled and sterilized.

The wastewater discharged through the wastewater outlet 133-1 is unfiltered concentrated water through the reverse osmosis membrane filter 130-1. The concentrated water contains dissolved ionic substances (Cl-, chlorine ions Is contained at a higher concentration than the raw water or the purified water. Therefore, when the electrolysis is performed in the sterilization module 300, more sterilization material can be generated compared with the case where electrolysis is performed using raw water or purified water, As well as using wastewater as waste water, it is possible to minimize waste of wastewater.

Meanwhile, the reverse osmotic pressure system as described above has a smaller amount of purified water that is filtered by the reverse osmosis membrane filter 130-1 and is introduced into the first storage tank 210 than the other embodiments where the hollow fiber membrane filter 140 is applied The purified water is supplied to the upper space 210a of the first storage tank 210 by connecting the purified water intake line 531 for supplying purified water to the user.

The sterilization mode according to the third embodiment of the present invention is performed in the following order: drainage → wastewater inflow → sterilization circulation → sterilization water drain → rinse water inflow → rinse water drain → water inflow order. The water treatment method in the water treatment apparatus according to the third embodiment will be described.

 FIG. 9 is a view showing a drainage process in the water treatment apparatus according to the third embodiment of the present invention. FIG. 10 is a view showing a process of introducing wastewater into the water treatment apparatus according to the third embodiment of the present invention, 3 is a view showing sterilization circulation process in the water treatment apparatus according to the embodiment.

In the present embodiment, the purified water filtered by the reverse osmosis membrane filter 130-1 is in a state in which the dissolved ionic substance necessary for electrolysis is removed from the sterilizing module 300. Therefore, If sterilization circulation is performed by using the water already stored in the first storage tank 210 and the second storage tank 220, there is a problem that the sterilizing material is generated in a small amount. Therefore, in this embodiment, it is preferable to drain the water stored in the first storage tank 210 and the second storage tank 220 prior to the sterilization circulation.

9, the raw water valve 150, the sterilization module 300, the first wastewater line shutoff valve 360 and the water intake shutoff valve 440 are in an off state, The valve 420, the hot water intake valve 430, and the circulation line shutoff valve 340 operate the circulation pump 310 in the On state. In this case, the direction of the drain line 541 is communicated from the circulation pump 310 to the flow path switching valve 320, and the opening / closing direction is set so that the flow is blocked toward the sterilizing module 300. The water in the upper space 210a may flow through the purified water intake line 531 and the first connection line 511 when the water intake valve 410 is turned on and off, Lt; / RTI >

When the circulation pump 310 is operated, the purified water in the upper space 210a of the first storage tank 210 flows in the direction of the circulation line 521 through the first connection line 511 and flows into the first storage tank 210, The cold water in the lower space 210b flows into the second storage tank 220 through the cold water intake line 532, the water outlet connection channel 455 and the hot water intake line 533, mixed with the hot water therein, And flows in the direction of the line 521. The water supplied through the first connection line 511 and the water discharged from the second storage tank 220 are discharged to the outside through the circulation line 521, the circulation pump 310 and the drain line 541, do.

In this case, the water in the first storage tank 210 and the water in the second storage tank 220 are mixed and drained in a state where the temperature is decreased. When the drainage progresses and the water level of the first storage tank 210 is lowered, The amount of water to be mixed with the hot water of the second storage tank 220 is reduced, and the time for the temperature of the hot water to be drained is shortened. Therefore, the inside of the circulation pump 310 must be made of a material having high heat resistance. In order to prevent this, water is supplied to the first storage tank 210 from the filter unit 100 by turning on the raw water valve 150 for a predetermined time during drainage so that the water pressure of the first storage tank 210 falls . In the case of the reverse osmosis membrane filter 130-1, since the amount of water to be purified is small, the first wastewater line shutoff valve 360 may be turned on to supply wastewater together with purified water.

10, when the circulating line shutoff valve 340 and the circulation pump 310 are turned off, the raw water valve 150 is opened, The purified water filtered by the reverse osmosis membrane filter 130-1 flows into the first storage tank 210 via the post carbon filter 140-1 Some of the wastewater that has not been filtered in the reverse osmosis membrane filter 130-1 is discharged to the outside through the wastewater regulator 550 and the drain line 541 and the remaining wastewater flows through the first wastewater line shutoff valve 360 and the circulation line And then flows into the first storage tank 210 through the line 521. In this case, the water intake valve 410, the cold water intake valve 420 and the hot water intake valve 430 can be turned off as well as turned on, Is connected to the upper portion and the lower portion of the second storage tank 220 via the purified water intake line 531, the cold water intake line 532, the hot water intake line 533 and the first connection line 511 Into the inside thereof.

The amount of wastewater drained through the drainage line 541 is regulated in the wastewater regulator 550 and then only a small amount is drained and most of the remaining wastewater flows through the first wastewater line 551 and the first wastewater line shutoff valve 360, To the first storage tank 210 and the second storage tank 220 through the first and second storage tanks 210 and 220, respectively.

The wastewater to be supplied through the first wastewater line 551 is concentrated water containing a large amount of ionic material, and is supplied to the first storage tank 210 through the purified water supply line 504 Since the amount of the purified water supplied through the purified water supply line 504 is smaller than the amount of the waste water supplied through the first waste water line 551, Even if the waste water is mixed with the waste water in the storage tank 210, the sterilized water generated using the waste water can sufficiently perform the sterilizing function.

When the inflow of the wastewater into the first storage tank 210 and the second storage tank 220 is completed through the above process, the sterilization circulation process proceeds. As shown in FIG. 11, the raw water valve 150 and the first wastewater The line shutoff valve 360 and the water intake shutoff valve 440 are turned off and the cold water intake valve 420 and the hot water intake valve 430 and the circulation line shutoff valve 340 and the sterilization module 300 are turned on When the circulation pump 310 is operated in the state where the waste water stored in the first storage tank 210 and the second storage tank 220 is passed through the sterilizing module 300, sterilizing water is generated, The sterilized water is filled in the first storage tank 210 and the second storage tank 220 while circulating through the circulation channel, thereby achieving a sterilization action. In this case, the water intake valve 410 can be turned off as well as on, and sterilization is also performed inside the purified water intake line 531 connected to the upper space 210a when the water intake valve 410 is on.

When the sterilization process is completed, a drainage of sterilized water is performed. The drainage of the sterilized water is performed by the same process as the drainage process shown in FIG.

When the drainage of the sterilized water is completed, the rinsing process for washing the sterilized water remaining in the first storage tank 210 and the second storage tank 220 proceeds, The process is the same as the process. In this case, wastewater that has not been filtered in the reverse osmosis membrane filter 130-1 can be sufficiently used as rinsing water, and the rinse time can be shortened compared with the case where the rinsing process is performed only by the purified water in the reverse osmosis membrane filter 130-1 .

When the rinsing process is completed, a rinse water drainage process for draining the rinse water of the first storage tank 210 and the second storage tank 220 to the outside is performed. The rinse water drain process is the same as the drainage process shown in FIG. 9 . ≪ / RTI >

In addition, when the rinse water drainage process is completed, a constant inflow process for filling the purified water in the first storage tank 210 and the second storage tank 220 proceeds. In the state of FIG. 10, The sterilization mode is ended by filling the first storage tank 210 and the second storage tank 220 through the purified water constant supply line 504 filtered through the filter unit 100 .

<Fourth Embodiment>

FIG. 12 is a view showing sterilizing circulation process in the water treatment apparatus according to the fourth embodiment of the present invention, and FIG. 13 is a view showing a sterilizing water drainage process in the water treatment apparatus according to the fourth embodiment of the present invention.

All the components of the present embodiment are the same as those of the first embodiment except that the water intake shutoff valve 440-1 is provided between the water intake port 450 and the water intake valves 410, 420, 430, A second storage tank shutoff valve 340 for allowing the water in the first storage tank 210 supplied through the connection line 511 to flow into the second storage tank 220 through a lower portion of the second storage tank 220 -1), water in the first storage tank 210 and water in the second storage tank 220 are supplied to the second connection line 512 through the water intake shutoff valve 440-1 during sterilization circulation .

The water intake shutoff valve 440-1 includes a channel switching valve and supplies water supplied from the lower space 210b of the first storage tank 210 and the second storage tank 220 to the second connection line 512 and the water intake port The flow direction is set to be one of the directions of the flow direction. That is, when water is to be supplied to the user through the intake port 450, the opening and closing directions are set so that the intake valves 410, 420, and 430 communicate with the intake port 450. In the sterilization circulation and drainage, And the two connection lines 512 communicate with each other.

The second storage tank shutoff valve 340-1 is turned off at the time of sterilization circulation so that the water in the upper space 210a of the first storage tank 210 passes through the first connection line 511, The water in the upper space 210a of the first storage tank 210 and the water in the second storage tank 220 are drained to the drain line 541, .

12, the sterilization circulation process is performed by turning off the raw water valve 150, the purified water intake valve 410 and the second storage tank shutoff valve 340-1, and the sterilization module 300 When the circulation pump 310 is operated while the cold water intake valve 420 and the hot water intake valve 430 are turned on, the cold water in the lower space 210a of the first storage tank 210 flows into the cold water intake line And the cold water intake valve 420 and the outlet connection channel 455 to the second connection line 512. The constants of the upper space 210a of the first storage tank 210 are supplied to the first connection line 511 are introduced into the lower portion of the second storage tank 220 and mixed with the hot water in the second storage tank 220 and then introduced into the hot water intake line 533 and the hot water intake valve 430 and the outlet portion connecting flow path 455 Is circulated through the second connection line 512 and the circulation line 521 while being supplied to the second connection line 512 and mixed with the cold water supplied from the lower space 210b of the first storage tank 210 flesh By the number of sterilized generated by the operation of the module 300 is made as sterilization.

After sterilization by the above-mentioned process, sterilized water in the first storage tank 210 and the second storage tank 220 is drained. As shown in FIG. 13, the raw water valve 150, The valve 410 and the sterilizing module 300 are turned off and the cold water intake valve 420 and the hot water intake valve 430 and the second storage tank shutoff valve 340-1 are turned on The sterilized water of the first storage tank 210 and the second storage tank 220 is supplied to the second storage tank shutoff valve 340-1 and the water intake shutoff valves 440-1 and 440-1, And is drained to the outside through the drain line 541 via the second connection line 512-2. In this case, the flow path switching valve 320 is closed in the direction of the sterilization module 300 from the circulation pump 310, and the opening / closing direction is set so as to communicate with the drain line 541 side. The opening and closing directions are set so as to communicate from the intake valves 420 and 430 to the second connection line 512 side.

According to this embodiment, since the sterilization water is sterilized to the water intake shutoff valve 440-1 just before the water intake port 450, the area of the dead zone that is not sterilized can be reduced.

The cold water intake valve 420 and the hot water intake valve 430 are simultaneously turned on during the sterilization cycle. However, after the cold water intake valve 420 is first turned on, the hot water intake valve 430 The cold water of the first storage tank 210 is supplied to the second connection line 512 and the circulation line 521 before the hot water of the second storage tank 220. Therefore, It can be prevented from being supplied to the second connection line 512 and the circulation line 521 first.

Although all of the above embodiments exemplify the case where the sterilizing water is provided in the water treatment apparatus circulating between the first storage tank 210 and the second storage tank 220, The present invention is also applicable to a water treatment apparatus that does not circulate water.

As described above, according to the present invention, it is possible to sterilize the interior of the piping connected to the plurality of intake valves 410, 420, and 430 for supplying water to the user and the outlet connection channel 455 connecting the plurality of intake valves 410, The area of the dead zone that can not be sterilized can be minimized. In addition, the water in the first storage tank 210 and the second storage tank 220 is circulated to generate sterilized water, so that the inside of the first storage tank 210 and the second storage tank 220 can be uniformly sterilized The water in the first storage tank 210 and the water in the second storage tank 220 are mixed and supplied to the circulation line 521 to prevent the hot water from being directly introduced into the circulation line 521 and the circulation pump 310 It is not necessary to use a material having high heat resistance, so that the price of the product can be lowered. Also, the circulation pump 310 can be used even when draining, so that it is possible to drain quickly without requiring a separate drain pump. Also, the first connection line shutoff valve (350) prevents the heated hot water from flowing back to the first storage tank, thereby preventing energy loss and smoothly supplying the sterilized water to all the circulating flow paths. And sterilized water can be generated without draining the water in the second storage tank, so that water can be prevented from being wasted and time required for sterilization can be shortened. In addition, waste water generated from the reverse osmosis membrane filter (130-1) is used to generate sterilized water, thereby minimizing the waste of waste water and generating a high concentration of sterilization material using the dissolved ionic material contained in the waste water The sterilization efficiency can be improved.

As described above, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the scope of the present invention as defined in the appended claims. And such modifications are within the scope of the present invention.

100: filter unit 110: pretreatment precipitation filter
120: free carbon filter 130: post carbon filter
130-1: reverse osmosis membrane filter 140: hollow fiber membrane filter
140-1: Post carbon filter 150: raw water valve
200: storage unit 210: first storage tank
210a: upper space 210b: lower space
213: separating plate 214: connecting channel
220: second storage tank 300: sterilization module
310: Circulation pump 320: Flow path switching valve
340: circulation line shutoff valve 340-1: second storage tank shutoff valve
350: first connection line shutoff valve 360: first waste water line shutoff valve
400: water outlet part 410: purified water intake valve
420: cold water intake valve 430: hot water intake valve
440, 440-1: intake water shutoff valve 450:
455: Outgoing line connecting flow path 501, 502, 503:
504, 505: purified water supply line 511: first connection line
512: second connection line 521: circulation line
531: purified water intake line 532: cold water intake line
533: hot water intake line 541: drainage line
550: wastewater regulator 551: first wastewater line
552: Second wastewater line

Claims (23)

A plurality of storage tanks for storing the filtered water at different temperatures, respectively;
A plurality of intake valves provided at the front end of the intake port for leaving the plurality of storage tank water respectively;
A water outlet connecting passage for connecting the plurality of intake valves to each other;
A sterilizing module for generating sterilizing water in the sterilizing mode to supply sterilized water to the plurality of storage tanks and the outlet connection channel;
A water intake shutoff valve provided between the intake port and the plurality of intake valves;
Lt; / RTI &gt;
Wherein the water outlet portion connecting passage connects the water intake shutoff valve and the plurality of intake valves,
In the sterilization mode, the plurality of intake valves are turned on, and the water intake shutoff valve is turned off so that the sterilized water supplied to the water outlet connection channel is circulated in the water treatment apparatus. The method according to claim 1,
Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank;
A circulation channel connected to circulate the water discharged from the first storage tank to the first storage tank through the second storage tank and a circulation channel connected to the water discharged from the first storage tank and the second storage tank through the circulation channel And a circulation pump for circulating the water. The method according to claim 1,
Wherein the plurality of storage tanks comprise a first storage tank consisting of an upper space for storing room temperature water and a lower space for storing cold water and a second storage tank connected to the first storage tank;
Wherein the plurality of intake valves include a cold water intake valve and a hot water intake valve for supplying cold water and hot water to the user, respectively;
A circulation channel connected to circulate water discharged from the first storage tank to the first storage tank through the second storage tank includes a cold water intake line for connecting the lower space and the cold water intake valve, And a hot water intake line connecting the upper part of the storage tank and the hot water intake valve. The method of claim 3,
Wherein the lower space and the upper portion of the second storage tank are connected to the cold water intake line and the hot water intake line when the cold water intake valve and the hot water intake valve are turned on to form the circulation flow path. Device. 3. The method of claim 2,
Wherein the first storage tank comprises an upper space for storing water at room temperature and a lower space for storing cold water;
Wherein the circulation channel includes a circulation line connected to allow the water discharged from the second storage tank to flow into the first storage tank and a circulation line through which water discharged from the upper space of the first storage tank is discharged from the second storage tank And a first connection line connecting between the first storage tank and the circulation line to be mixed with water. The method according to claim 1,
Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank;
A first connection line connecting the first storage tank and the second storage tank;
And a first connection line shutoff valve is provided on the first connection line to shut off the connection between the first storage tank and the second storage tank. 3. The method of claim 2,
Wherein the circulation flow path includes a circulation line connected to allow the water discharged from the second storage tank to flow into the first storage tank;
A drain line for discharging the water of the first storage tank and the second storage tank to the outside is branched on the circulation line;
Wherein the branch point is provided with a flow path switching valve for switching the flow direction of the water passing through the circulation line. 3. The method of claim 2,
Wherein the circulation pump is provided on the circulation flow path and operates during sterilization circulation and drainage. The method according to claim 1,
Wherein the plurality of intake valves are connected to one intake port. The method according to claim 1,
Wherein the filter unit comprises an inverse osmotic membrane filter and generates sterile water in the sterilization module using wastewater discharged from the reverse osmosis membrane filter. 11. The method of claim 10,
Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank;
A circulation line connected to circulate water discharged from the first storage tank to the first storage tank through the second storage tank;
A first waste water line connecting the waste water outlet of the reverse osmosis membrane filter and the circulation line and a first waste water line shutoff valve for controlling the supply of wastewater to the first storage tank side through the first waste water line Wherein the water treatment apparatus comprises: 12. The method of claim 11,
A drain line branched on the circulation line so as to drain to the outside;
A second wastewater line branching on the first wastewater line and connected to the drain line;
And a wastewater regulator for limiting an amount of wastewater discharged to the outside through the second wastewater line. 3. The method of claim 2,
Wherein the first storage tank comprises an upper space for storing water at room temperature and a lower space for storing cold water;
Wherein the circulation channel includes a circulation line connected to allow water discharged from the second storage tank to flow into the first storage tank, a first connection line connecting between the upper space and the circulation line, And a second connection line connecting between the lines;
In the sterilization mode, water in the lower space is supplied to the circulation line through the second connection line, and water in the upper space flows into the second storage tank through the first connection line, Water is mixed with water and then supplied to the circulation line. 14. The method of claim 13,
Wherein the lower space and the water of the second storage tank are supplied to the user through one intake port and the water supplied from the lower space and the second storage tank is supplied to the user between the intake port and the plurality of intake valves, And a water intake shutoff valve for supplying water in the direction of one of the line and the water intake. 14. The method of claim 13,
And a second storage tank shutoff valve is provided between the first connection line and the circulation line to turn off the second storage tank shutoff valve during sterilization circulation so that water in the upper space flows into the second storage tank And is mixed with the water in the second storage tank and then supplied to the second connection line. The method according to claim 1,
Wherein the plurality of intake valves and the outlet connecting channel are integrally coupled to one body. a) storing the filtered water in a plurality of storage tanks at different temperatures, respectively;
b) in a sterilization mode, a plurality of intake valves provided at a front end of the intake port for leaving the plurality of storage tanks respectively are turned on, and a water intake shutoff valve provided between the intake port and the plurality of intake valves is off The sterilizing module supplies the sterilized water generated by the sterilizing module to the plurality of intake valves, passes through the outlet connection channel for communicating the plurality of intake valves and the intake shutoff valve, Sterilizing the plurality of storage tanks and the water outlet connecting passage by controlling circulation within the apparatus;
c) draining the sterilized water in the plurality of storage tanks to the outside;
&Lt; / RTI &gt; delete 18. The method of claim 17,
Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank;
Wherein the step b) includes circulating the sterilization water through a circulation line connecting the first storage tank and the second storage tank and between the first storage tank and the second storage tank, wherein the first storage tank and the second storage tank Wherein the water is introduced into the circulation line in a mixed state. 20. The method of claim 19,
The water stored in the first storage tank is lower in temperature than the water stored in the second storage tank and the water in the second storage tank is supplied to the circulation line after the water in the first storage tank is supplied to the circulation line The water of the first storage tank and the water of the second storage tank are mixed with each other. 18. The method of claim 17,
Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank;
Wherein the first storage tank comprises an upper space for storing water at room temperature and a lower space for storing cold water, the upper space and the second storage tank being connected by a first connection line, 1 connection line shutoff valve is provided to turn off the first connection line shutoff valve when heating the second storage tank. 18. The method of claim 17,
Wherein the plurality of storage tanks comprise a first storage tank and a second storage tank;
Wherein the first storage tank comprises an upper space for storing water at room temperature and a lower space for storing cold water, the upper space and the second storage tank being connected by a first connection line, The tank is connected by a cold water intake line and a hot water intake line and a first connection line shutoff valve is provided on the first connection line to turn off the first connection line shutoff valve for sterilization circulation for a certain time, Water supply line and the hot water intake line. 18. The method of claim 17,
The rinsing process of the plurality of storage tanks is performed by the rinsing water after the step c), and the rinsing process is performed by circulating the rinsing water through the circulation line connecting the plurality of storage tanks and the plurality of storage tanks And water.

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