Water treatment system, water treatment method and water treatment module

Abstract

To provide a water treatment system capable of suppressing clogging of a filtration membrane and achieving a long life of the filtration membrane, a water treatment method and a water treatment module.SOLUTION: The water treatment system comprises: a filtration unit including a filtration membrane separating water to be treated into permeated water and concentrated water; a contact unit allowing ozone to contact with the water to be treated supplied to the filtration unit; and an ozone feeder feeding ozone to the water to be treated in the contact unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a water treatment system, a water treatment method, and a water treatment module. [Background technology]

[0002] Filtration devices that use filtration membranes are extremely effective at removing impurities from water, and are therefore used to produce pure water for industrial use and water for daily life. For example, Patent Document 1 describes a drinking water vending machine equipped with a reverse osmosis membrane type filtration device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3420202 Summary of the Invention [Problem to be solved by the invention]

[0004] In a filtration device using a filtration membrane, pressure is applied to the water (water to be treated) supplied to the filtration device to separate it into water that passes through the filtration membrane (permeated water) and water that does not pass through the filtration membrane (concentrated water). Generally, if the water to be treated contains ozone, the filtration membrane is easily damaged, and therefore ozone treatment of the water to be treated is not carried out in a filtration device that uses a filtration membrane. However, if the water to be treated that comes into contact with the filtration membrane contains a large amount of bacteria and nutrients, such as domestic wastewater, the bacteria and nutrients from the water to be treated may cause fungal growth and decay, resulting in clogging of the membrane surface, which may result in an increase in filtration pressure and a decrease in filtration flow rate. Therefore, when the water to be treated was treated with ozone in order to suppress the growth of bacteria in the water that was passed through the filtration membrane, it was found through research that clogging of the filtration membrane was suppressed and the lifespan of the filtration membrane tended to be extended. In view of the above circumstances, an object of the present disclosure is to provide a water treatment system, a water treatment method, and a water treatment module that can suppress clogging of a filtration membrane and achieve a longer life for the filtration membrane. [Means for solving the problem]

[0005] The means for solving the above problems include the following embodiments. <1> a filtration unit including a filtration membrane that separates the water to be treated into permeate and concentrated water; a contact section that brings ozone into contact with the water to be treated that is supplied to the filtration section; an ozone supply unit that supplies ozone to the water to be treated in the contact unit. <2> Further provided is a confluence section where the water to be treated and the concentrated water extracted from the filtration section are combined. <1> The water treatment system according to claim 1. <3> The contact portion and the joining portion are independent of each other. <2> The water treatment system according to claim 1. <4> Further provided is a preliminary filtration unit that filters the water to be treated. <1> ~ <3> Any one of the above water treatment systems. <5> the ozone supply unit supplies ozone to the water to be treated based on the monitoring result of the chromaticity of the water to be treated. <1> ~ <4> The water treatment system according to any one of claims 1 to 10. <6> Further provided is a discharge unit that discharges the concentrated water as waste water. <1> ~ <5> The water treatment system according to any one of claims 1 to 10. <7> The timing of discharge of wastewater is determined based on the results of monitoring the electrical conductivity of the water to be treated. <6> The water treatment system according to claim 1. <8> a filtration step of separating the water to be treated into permeate and concentrated water using a filtration membrane; an ozone treatment step of contacting the water to be treated with ozone. <9> The method further includes a mixing step of mixing the water to be treated with the concentrated water obtained in the filtration step. <8> The water treatment method according to claim 1. <10> The ozone treatment step and the mixing step are independent of each other. <9> The water treatment method according to claim 1. <11> Further provided is a preliminary filtration step of filtering the water to be treated. <8> ~ <10> The water treatment method according to any one of the above. <12> The ozone treatment step includes contacting the water to be treated with ozone based on a result of monitoring the color of the water to be treated. <8> ~ <11> The water treatment method according to any one of the above. <13> Further comprising a discharge step of discharging the concentrated water as waste water. <8> ~ <12> The water treatment method according to any one of the above. <14> The timing of discharge of wastewater is determined based on the results of monitoring the electrical conductivity of the water to be treated. <13> The water treatment method according to claim 1. <15> <1> ~ <7> 1. A water treatment module comprising at least one selected from the group consisting of a filtration unit, a contact unit, and an ozone supply unit included in the water treatment system according to any one of claims 1 to 9. [Effects of the Invention]

[0006] According to the present disclosure, a water treatment system, a water treatment method, and a water treatment module are provided that can suppress clogging of a filtration membrane and achieve a longer life for the filtration membrane. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a conceptual diagram illustrating an example of the configuration of a water treatment system. [Figure 2] 1 is a conceptual diagram illustrating an example of the configuration of a water treatment system. [Figure 3] 1 is a conceptual diagram illustrating an example of the configuration of a water treatment system. [Figure 4] 1 is a conceptual diagram illustrating an example of the configuration of a water treatment system. DETAILED DESCRIPTION OF THE INVENTION

[0008] In the present disclosure, a numerical range indicated using "to" indicates a range that includes the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In the numerical ranges described in stages in this disclosure, the upper or lower limit value described in a certain numerical range may be replaced by the upper or lower limit value of another numerical range described in stages, or may be replaced by a value shown in an example.

[0009] <Water treatment system> The water treatment system of the present disclosure comprises: a filtration unit including a filtration membrane that separates the water to be treated into permeate and concentrated water; a contact section that brings ozone into contact with the water to be treated that is supplied to the filtration section; an ozone supply unit that supplies ozone to the contact unit.

[0010] According to the water treatment system of the present disclosure, clogging of the filtration membrane is effectively suppressed. Causes of clogging of filtration membranes include clogging of pores in filtration membranes by inorganic components such as calcium, and clogging of pores in filtration membranes by biofilms derived from organic matter. In the water treatment system disclosed herein, ozone is brought into contact with the water to be treated, thereby killing and inactivating microorganisms contained in the water. As a result, the pores of the filtration membrane are less likely to become clogged with biofilms derived from microorganisms, thereby extending the life of the filtration membrane. Furthermore, in the water treatment system of the present disclosure, a decrease in the amount of permeate and an increase in filtration pressure due to a decrease in the effective filtration area caused by the generation of biofilm are suppressed.

[0011] In the present disclosure, contacting water to be treated with ozone is also referred to as "ozone treatment." In this disclosure, "water to be treated" refers to the entire object of filtration in the filtration unit. "Raw water" refers to water to be treated that has not been mixed with concentrated water extracted from the filtration unit. That is, the concept of "water to be treated" in this disclosure includes raw water that has not been mixed with concentrated water and a mixture of raw water and concentrated water.

[0012] In the water treatment system of the present disclosure, the type of water to be treated is not particularly limited. For example, the water to be treated may include tap water, surface water, well water, rainwater, stored water stored in tanks, water discharged from daily life facilities, etc. In particular, stored water stored in tanks that are not properly cleaned and water discharged from daily life facilities tend to contain large amounts of microorganisms and organic matter that cause biofilms. In the water treatment system disclosed herein, ozone treatment of the water to be treated can reduce the concentration of microorganisms or kill them. Therefore, even when the water to be treated contains a large amount of organic matter, bacterial growth is suppressed and clogging of the filtration membrane due to biofilm formation is effectively suppressed.

[0013] Specific examples of water discharged from living facilities include water discharged from living facilities such as bathrooms, shower rooms, washbasins, kitchens, toilets, etc. The water discharged from living facilities may be in a state that has been subjected to biological treatment using microorganisms.

[0014] In the water treatment system of the present disclosure, the configuration of the filtration unit is not particularly limited as long as it includes a filtration membrane. For example, the filtration unit may be a roll or stack of filtration membranes housed in a container. The filtration unit may include a mechanism for applying pressure to raw water supplied to the filtration unit, and the mechanism may be connected to an external power source.

[0015] The type of filtration membrane included in the filtration section is not particularly limited, and can be selected from pressure-filtered types such as reverse osmosis membranes (RO membranes), nanofiltration membranes (NF membranes), ultrafiltration membranes (UF membranes), and microfiltration membranes (MF membranes). From the viewpoint of impurity removal performance, reverse osmosis membranes and nanofiltration membranes are preferred as filtration membranes, with reverse osmosis membranes being more preferred.

[0016] (contact part) In the water treatment system of the present disclosure, the configuration of the contact section is not particularly limited as long as it is possible to bring ozone into contact with the water to be treated that is supplied to the filtration section. For example, the contact part may be a tank capable of storing the water to be treated therein, or a pipe through which the water to be treated can flow. The water to be treated with ozone in the contact section may be in a state where it is not mixed with the concentrated water extracted from the filtration section (i.e., raw water), or may be in a state where it is mixed with the concentrated water extracted from the filtration section.

[0017] (Ozone supply unit) In the water treatment system of the present disclosure, the configuration of the ozone supply unit is not particularly limited as long as it can supply ozone to the contact unit. For example, the ozone supply unit can be selected from known ozone generators. The ozone supplying section may supply ozone to the contact section either constantly or intermittently. Methods for the ozone supply unit to intermittently supply ozone to the contact unit include, for example, a method in which a time for operating the ozone supply unit is set and the ozone supply unit is operated at the set time, and a method in which the ozone supply unit is operated when ozone treatment becomes necessary due to fluctuations in the impurity concentration of the water to be treated.

[0018] The ozone treatment of the water to be treated in the contact section may be carried out based on the results of monitoring the state of the water to be treated. That is, the water treatment system of the present disclosure may further include a monitoring section that monitors the state of the water to be treated. Based on the state of the water to be treated monitored by the monitoring unit, for example, the supply of ozone to the water to be treated may be started when the impurity concentration of the water to be treated reaches a standard value, and the supply of ozone to the water to be treated may be continued until the impurity concentration of the water to be treated falls below the standard value.

[0019] The reference value for the impurity concentration of the water to be treated can be set using various indices. Suitable indices for the impurity concentration in the water treatment system of the present disclosure include bacterial count, color, electrical conductivity, turbidity, odor level, and viscosity, with color being preferred. The index used to set the reference value for the impurity concentration in the water to be treated may be one index or a combination of two or more indexes.

[0020] (Confluence) The water treatment system of the present disclosure may further include a confluence section where the water to be treated and the concentrated water extracted from the filtration section are combined. That is, the water treatment system of the present disclosure may be provided with a mechanism for filtering the concentrated water extracted from the filtration unit again as water to be treated, rather than discarding the concentrated water as is. In the present disclosure, a water treatment system having a mechanism for filtering the concentrated water extracted from the filtration unit again as water to be treated is also referred to as a "circulating water treatment system." That is, the water treatment system of the present disclosure may be a circulating water treatment system.

[0021] Recirculating water treatment systems have a high recovery rate of permeate (the ratio of permeate to treated water) obtained in the filtration section, making them highly efficient at saving water.However, recirculating water treatment systems are prone to organic matter from concentrated water accumulating in the treated water, and are prone to clogging of the filtration membrane due to the formation of biofilms from microorganisms that use the organic matter as a nutrient source. The water treatment system of the present disclosure performs ozone treatment on the water to be treated at the contact point, so that microorganisms in the water to be treated are killed or the microbial concentration is controlled. Therefore, even if organic matter from the concentrated water is mixed into the water to be treated, the microorganisms are less likely to grow using the organic matter as a nutrient source, and biofilm formation is suppressed. As a result, clogging of the filtration membrane in the water treatment system is effectively suppressed.

[0022] In the water treatment system of the present disclosure, the configuration of the confluence section is not particularly limited as long as it can cause concentrated water to be confluent with the water to be treated. For example, the confluence may be a tank capable of storing the water to be treated therein, or a pipe through which the water to be treated can flow.

[0023] The contact portion and the confluence portion may be integrated or may be independent of each other. An example of a case where the contact section and the confluence section are integrated is when the ozone treatment of the water to be treated and the mixing of the water to be treated with concentrated water are carried out in the same tank or pipe. An example of a case where the contact section and the confluence section are independent of each other is when the ozone treatment of the water to be treated and the mixing of the water to be treated with the concentrated water are carried out in different tanks or pipes.

[0024] When the ozonation step of the water to be treated and the step of mixing the water to be treated with the concentrated water are managed separately, it is preferable that the contact section and the confluence section are independent from each other. From the viewpoint of saving space in the water treatment device and reducing maintenance costs, it is preferable that the contact section and the confluence section are integrated. When the contact section and the confluence section are independent of each other, the confluence section may be located between the contact section and the filtration section, or the contact section may be located between the confluence section and the filtration section. Because the microbial concentration of the concentrated water is controlled by the ozone treatment performed before filtration, from the viewpoint of the efficiency of the ozone treatment, it is preferable to locate the confluence section between the contact section and the filtration section (i.e., to perform ozone treatment on the water to be treated that is not mixed with the concentrated water).

[0025] (Pre-filtration section) The water treatment system of the present disclosure may further include a preliminary filtration section that filters the water to be treated. By providing a preliminary filtration section that filters the water to be treated in a water treatment system, impurities contained in the water to be treated that is supplied to the filtration section can be more effectively removed, and clogging of the filtration membrane can be more effectively prevented. The configuration of the pre-filtration section is not particularly limited and can be selected depending on the state of the water to be treated, the state of foreign matter and impurities contained in the water, etc. Specific examples of materials that can be used for the pre-filtration section include known materials such as anthracite, gravel, sand, cellulose, porous synthetic resin, polymer fibers such as nonwoven fabric, activated carbon, zeolite, ceramics, and filtration membranes.

[0026] The location where the preliminary filtration unit is provided in the water treatment system is not particularly limited as long as it is a location where the water to be treated can be filtered (that is, a location upstream of the filtration unit). When the water treatment system includes a confluence between the contact section and the filtration section, the pre-filtration section may be located upstream of the confluence or downstream of the confluence, but is preferably located upstream of the confluence. Examples of cases in which the preliminary filtration section is located upstream of the confluence section include when the preliminary filtration section is located between the contact section and the confluence section, and when the preliminary filtration section is located upstream of the contact section (for example, between the contact section and a raw water tank that stores raw water to be supplied to the contact section). An example of a case where the pre-filtration section is disposed downstream of the confluence section is a case where the pre-filtration section is disposed between the confluence section and the filtration section. The number of preliminary filtration units arranged in the water treatment system may be one or two or more. The type of pre-filtration unit arranged in the water treatment system may be one type or two or more types.

[0027] (Discharge section) The water treatment system of the present disclosure may further include a discharge section that discharges the concentrated water extracted from the filtration section as waste water. The configuration of the discharge unit is not particularly limited as long as it is capable of discharging the concentrated water as waste water. For example, the discharge unit may be a tank or pipe equipped with an outlet for the concentrated water. The discharge unit may discharge all of the concentrated water extracted from the filtration unit as waste water, or may discharge a portion of the concentrated water as waste water. An example of discharging a portion of the concentrated water as waste water is when a portion of the concentrated water is combined with the water to be treated.

[0028] The timing of discharging the waste water by the discharge unit may be determined based on the results of monitoring the electrical conductivity (EC) of the water to be treated. The electrical conductivity of the water to be treated can be used, for example, as an indicator of the concentration of contaminants in the water to be treated. For example, if the electrical conductivity of the water to be treated is below a set standard, the waste water may not be discharged, and if the electrical conductivity of the water to be treated is above a set value, the waste water may be discharged. When concentrated water is combined with raw water in a water treatment system, repeated combination processes can cause organic matter from the raw water to accumulate in the raw water, increasing the electrical conductivity of the water and making it more susceptible to clogging of the filtration membrane. Therefore, before clogging of the filtration membrane occurs, the concentrated water may be discharged as waste water when the electrical conductivity of the water to be treated exceeds a set value, thereby reducing the electrical conductivity of the water to be treated flowing into the filtration section and reducing the load on the filtration section.

[0029] The method for monitoring the electrical conductivity of the water to be treated is not particularly limited and can be performed by a known method. For example, an electrical conductivity meter may be installed in a tank that stores the water to be treated or in a pipe through which the water to be treated flows. Control of the discharge unit based on the results of monitoring the electrical conductivity may be performed manually or automatically. The monitoring results obtained by the electrical conductivity meter may be recorded on the cloud via a communication means such as Wi-Fi. Monitoring of the electrical conductivity and control of the discharge unit may be performed for each water treatment module disclosed below, for each water treatment system equipped with a water treatment module, or for multiple water treatment systems collectively.

[0030] (Other configurations) If necessary, the water treatment system of the present disclosure may further include other components in addition to the components described above. Other components that the water treatment system may include a raw water tank for storing raw water, instruments for managing water quality, and a computer system for controlling the operation of the water treatment system. When the water treatment system includes a raw water tank (including when the raw water tank is connected to a water treatment module), the raw water tank may be directly connected to the contact unit or may be connected to the contact unit via a pipe. When the raw water tank is connected to the contact unit via a pipe, a filter may be disposed in the pipe. When a water treatment system is equipped with a computer system for controlling the operation of the water treatment system, the computer system may independently control the operation of one water treatment system or may collectively control the operation of multiple water treatment systems.

[0031] As one embodiment of the water treatment system of the present disclosure, an example of the configuration of a circulating water treatment system will be described with reference to the drawings. In each of the following figures, arrows indicate the flow direction of water before or after treatment. The configurations shown in each figure are examples, and the configuration of the water treatment system of the present disclosure is not limited to these.

[0032] A preferred embodiment of the water treatment system of the present disclosure is shown in FIG. The water treatment system 10 shown in FIG. a filtration unit 11 including a filtration membrane that separates the water to be treated into permeate and concentrated water; a tank 12 for storing the water to be treated that is supplied to the filtration unit 11; An ozone supply unit 13 that supplies ozone to the tank 12 is provided.

[0033] In the water treatment system 10, the tank 12 that stores the water to be treated and is supplied to the filtration unit 11 corresponds to the contact unit where the water to be treated is brought into contact with ozone, and also corresponds to the confluence unit where the water to be treated and the concentrated water are combined. That is, in the water treatment system 10, the contact unit and the confluence unit are integrated.

[0034] Water treatment system 10 includes transfer line 14 for transferring concentrated water extracted from filtration unit 11. Transfer line 14 has a branched structure into transfer line 14A for transferring concentrated water to tank 12 and transfer line 14B for discharging the concentrated water as waste water. 1 has a structure in which transfer line 14A and transfer line 14B are branched, but the configuration of the water treatment system of the present disclosure is not limited to this. For example, water treatment system 10 may be provided with a transfer line that transfers concentrated water to a tank and a transfer line that discharges concentrated waste water, which are independent of each other.

[0035] A preferred embodiment of the water treatment system of the present disclosure is shown in FIG. The water treatment system 20 shown in FIG. a filtration unit 21 including a filtration membrane that separates the water to be treated into permeate and concentrated water; a tank 22 for storing the water to be treated that is supplied to the filtration unit 21; an ozone supply unit 23 that supplies ozone to the tank 22; The system is provided with a transfer line 24 having a branched structure into a transfer line 24A for transferring concentrated water to a branch 25 and a transfer line 24B for discharging the concentrated water as waste water.

[0036] Water treatment system 20 differs from water treatment system 10 shown in Figure 1 in that the confluence where the water to be treated and the concentrated water join is not tank 22, but branch 25 provided in the piping connecting filtration section 21 and tank 22.

[0037] A preferred embodiment of the water treatment system of the present disclosure is shown in FIG. The water treatment system 30 shown in FIG. a filtration section 31 including a filtration membrane that separates the water to be treated into permeate and concentrated water; a tank 32 for storing the water to be treated that is supplied to the filtration unit 31; an ozone supply unit 33 that supplies ozone to the tank 32; a transfer line 34 having a branched structure into a transfer line 34A for transferring concentrated water to a branch 35 and a transfer line 34B for discharging the concentrated water as waste water; and an EC measuring device 36 for measuring the electrical conductivity of the water to be treated.

[0038] Water treatment system 30 differs from water treatment system 20 shown in FIG. 2 in that it includes an EC measuring device 36 that measures the electrical conductivity of the water to be treated. 3, the EC meter 36 is provided between the branch 35 where the water to be treated and the concentrated water join and the filtration unit 31, but the configuration of the water treatment system of the present disclosure is not limited to this. For example, the EC meter 36 may be provided between the branch 35 and the tank 32.

[0039] A preferred embodiment of the water treatment system of the present disclosure is shown in FIG. The water treatment system 40 shown in FIG. a filtration section 41 including a filtration membrane that separates the water to be treated into permeate and concentrated water; a tank 42 for storing the water to be treated that is supplied to the filtration unit 41; an ozone supply unit 43 that supplies ozone to the tank 42; a transfer line 44 having a branched structure into a transfer line 44A for transferring concentrated water to a branch 45 and a transfer line 44B for discharging the concentrated water as waste water; and a preliminary filtering section 47 for filtering the water to be treated.

[0040] Water treatment system 40 differs from water treatment system 20 shown in FIG. 2 in that water treatment system 40 includes a pre-filtration unit 47 that filters the water to be treated. 4, preliminary filtration sections 47 are respectively arranged between filtration section 41 and branch 45, between tank 42 and branch 45, and upstream of tank 42, but the configuration of the water treatment system of the present disclosure is not limited to this. For example, preliminary filtration sections 47 may be arranged in one or two of the three locations described above, or preliminary filtration sections 47 may be arranged in a location other than the three locations described above.

[0041] The operation of each element constituting the water treatment system of the present disclosure may be performed manually or automatically, or may be performed in a combination of manual and automatic modes. From the viewpoint of the operating costs of the water treatment system, it is preferable that the operation of each element constituting the water treatment system be at least partially automated.

[0042] The use of the permeate extracted from the water treatment system of the present disclosure is not particularly limited. Specific uses of the permeate include use in living facilities such as bathrooms, shower rooms, washbasins, kitchens, and toilets, use in industrial facilities such as factories and farms, use as water supply and sewage, and release into the natural environment. In one aspect of the water treatment system of the present disclosure, the permeate removed from the water treatment system may be utilized, and then the utilized permeate may be supplied to the water treatment system as raw water. From the viewpoint of cost-effectiveness in using the water treatment system, it is preferable that the permeate extracted from the water treatment system of the present disclosure be used in living facilities.

[0043] The water treatment system of the present disclosure, even if it is a circulating water treatment system / module, can reduce operating costs because clogging of the filtration membrane is suppressed. Therefore, the water treatment system of the present disclosure is excellent for effectively obtaining purified water and can be suitably used under limited conditions where the available water quality is poor, such as in areas with scarce water resources or disaster-stricken areas.

[0044] The scale of water treatment by the water treatment system of the present disclosure is not particularly limited. For example, the amount of water treated per day by the water treatment system of the present disclosure can be selected from the range of 100 mL to 50,000 L. When the water treatment system is used as a home water purifier, the scale of water treatment can be selected from the range of 100 mL to 50 L, for example. When the water treatment system is used as a household wastewater purification device, the scale of water treatment can be selected from the range of 1 L to 1,000 L, for example. When the water treatment system is used as a relatively large-scale water treatment device such as a device for purifying rainwater stored in a rooftop tank, the scale of water treatment can be selected from the range of 100L to 50,000L, for example. The water treatment system of the present disclosure can also be suitably used for producing permeate under conditions where the scale of water treatment is small and the supply amount of water to be treated is limited.

[0045] <Water treatment method> The water treatment method of the present disclosure includes: a filtration step of separating the water to be treated into permeate and concentrated water; and an ozone treatment step of contacting the water to be treated with ozone.

[0046] According to the water treatment method of the present disclosure, clogging of the filtration membrane is effectively suppressed. In the water treatment method of the present disclosure, the filtration membrane used in the filtration step may be the filtration membrane used in the water treatment system of the present disclosure described above. In the water treatment method of the present disclosure, the ozone treatment of the water to be treated may be carried out using a known ozone generator.

[0047] In the water treatment method of the present disclosure, the ozone treatment step may include supplying ozone to the water to be treated based on the monitoring result of the chromaticity of the water to be treated.

[0048] The water treatment method of the present disclosure may further include a mixing step of mixing the water to be treated with the concentrated water. That is, the water treatment method of the present disclosure may be a circulating water treatment method. When the water treatment method of the present disclosure includes a mixing step, the ozone treatment step and the mixing step may be carried out simultaneously (i.e., the water to be treated is mixed with concentrated water while being brought into contact with ozone) or may be carried out independently of each other. When the ozone treatment step and the mixing step are carried out independently, the ozone treatment step may be carried out either before or after the mixing step. Since the microbial concentration in the concentrated water is controlled by the ozone treatment carried out before the filtration step, from the viewpoint of the efficiency of the ozone treatment, it is preferable to carry out the ozone treatment step before the mixing step (i.e., to carry out ozone treatment on the water to be treated that has not been mixed with the concentrated water).

[0049] The water treatment method of the present disclosure may further include a pre-filtration step of filtering the water to be treated. The method for performing the pre-filtration step is not particularly limited and can be selected depending on the state of the water to be treated, the state of foreign matter and impurities contained in the water, etc. The pre-filtration step can be carried out, for example, by the pre-filtration section that may be included in the water treatment system described above.

[0050] The water treatment method of the present disclosure may further include a discharge step of discharging the concentrated water obtained in the filtration step as waste water. In the discharge step, all of the concentrated water obtained in the filtration step may be discharged as waste water, or a portion of the concentrated water may be discharged as waste water. When a portion of the concentrated water is discharged as waste water, the concentrated water may be combined with the water to be treated.

[0051] The timing of discharging the wastewater in the discharging step may be determined based on the results of monitoring the electrical conductivity of the water to be treated. For example, if the electrical conductivity of the water to be treated is below a set standard, the waste water may not be discharged, and if the electrical conductivity of the water to be treated is above a set value, the waste water may be discharged. When concentrated water is mixed with raw water in a water treatment system, organic matter from the concentrated water may accumulate in the raw water, increasing the electrical conductivity of the raw water and making the filtration membrane more susceptible to clogging. Therefore, in order to prevent clogging of the filtration membrane, waste water may be discharged and the mixing ratio of concentrated water to raw water may be reduced when the electrical conductivity of the raw water exceeds a set value.

[0052] The method for carrying out the water treatment method of the present disclosure is not particularly limited. For example, the method may be carried out using the water treatment system of the present disclosure described above.

[0053] <Water treatment module> The water treatment module of the present disclosure comprises: The water treatment system includes at least one selected from the group consisting of a filtration unit, a contact unit, and an ozone supply unit. In this disclosure, a water treatment module refers to a component or combination of components for use in a water treatment system. The water treatment module of the present disclosure is not particularly limited as long as it can be used in the water treatment system of the present disclosure, and may be an independent component that is connected to an existing filtration device, water treatment device, or water distribution pipe. [Explanation of symbols]

[0054] 10, 20, 30, 40: Water treatment systems 11, 21, 31, 41: Filtration section 12, 22, 32, 42: Tank 13, 23, 33, 43: Ozone supply unit 14, 24, 34, 44: Transfer lines 25, 35, 45: Branch 36:EC measuring instrument 47: Pre-filtration section

Claims

1. a filtration unit including a filtration membrane that separates the water to be treated into permeate and concentrated water; a contact section that brings ozone into contact with the water to be treated that is supplied to the filtration section; an ozone supply unit that supplies ozone to the water to be treated in the contact unit.

2. The water treatment system according to claim 1 , further comprising a confluence section where the water to be treated and the concentrated water extracted from the filtration section are confluent.

3. The water treatment system according to claim 2 , wherein the contact portion and the confluence portion are independent of each other.

4. The water treatment system according to claim 1 , further comprising a pre-filtration section for filtering the water to be treated.

5. The water treatment system according to claim 1 , wherein the ozone supply unit supplies ozone to the water to be treated based on a monitoring result of the chromaticity of the water to be treated.

6. The water treatment system according to claim 1 , further comprising a discharge section that discharges the concentrated water as waste water.

7. 7. The water treatment system according to claim 6, wherein the timing of discharging the waste water is determined based on the results of monitoring the electrical conductivity of the water to be treated.

8. a filtration step of separating the water to be treated into permeate and concentrated water using a filtration membrane; an ozone treatment step of contacting the water to be treated with ozone.

9. The water treatment method according to claim 8 , further comprising a mixing step of mixing the water to be treated with concentrated water obtained in the filtration step.

10. 10. The water treatment method of claim 9, wherein the ozonation step and the mixing step are independent of each other.

11. The water treatment method according to claim 8 , further comprising a pre-filtration step of filtering the water to be treated.

12. 9. The water treatment method according to claim 8, wherein the ozone treatment step includes contacting the water to be treated with ozone based on a result of monitoring the chromaticity of the water to be treated.

13. The water treatment method according to any one of claims 8 to 12, further comprising a discharge step of discharging the concentrated water as waste water.

14. 14. The water treatment method according to claim 13, wherein the timing of discharging the waste water is determined based on the results of monitoring the electrical conductivity of the water to be treated.

15. A water treatment module comprising at least one selected from the group consisting of a filtration unit, a contact unit, and an ozone supply unit included in the water treatment system according to any one of claims 1 to 7.

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