Water desalination methods

Abstract

A water desalination method. In this method, an electrowetting device is provided above the water to be desalinated, wherein the electrowetting device includes a conductive substrate and an insulating layer covering the surface of the conductive substrate. The electrowetting device adsorbs water vapor of the water to be desalinated above a surface of the insulating layer. A discharge device is used to perform a discharge treatment on the surface of the insulating layer to charge the water vapor. During the discharge treatment, electricity is applied to the conductive substrate so that the conductive substrate and the charged water vapor have different electrical properties, thereby attracting the charged water vapor to the surface of the insulating layer and condensing it into water on the surface of the insulating layer. When the water on the surface of the insulating layer accumulates to a preset amount, the electrowetting device is transferred to the top of the fresh water collection tank and the application of electricity is stopped. In this way, water desalination can be successfully completed under low energy consumption, so the cost of water desalination can be greatly reduced.

Description

Technical Field

[0001] The present disclosure relates to a water treatment technology, and more particularly to a water desalination method. Background Art

[0002] Current water desalination technologies often use distillation or reverse osmosis. Both methods require a lot of energy to complete, which is not only very energy-consuming, but also difficult to complete water desalination in an environment where a lot of electricity is not available or there is a lack of electricity. In addition, both water desalination technologies require large-scale equipment to be economical and have high operating costs.

[0003] For example, in water desalination technology using distillation, water is recovered by using the difference in water vapor pressure caused by high and low temperatures. First, the brine temperature needs to be increased to evaporate water from the brine. Then, the temperature of the evaporated water vapor is lowered to reach a supersaturated state, and condensed fresh water can be obtained. Keeping the brine at a high temperature will accelerate the corrosion rate of the equipment that the brine contacts, resulting in an increase in operating costs. Summary of the invention

[0004] Therefore, one purpose of the present disclosure is to provide a water desalination method, which can charge the water vapor of the water body to be desalinated, and use the electrowetting device to attract the water vapor through the Coulomb force, and then release the fresh water condensed on the electrowetting device by stopping the power supply. In this way, water desalination can be successfully completed under low energy consumption, so the cost of water desalination can be greatly reduced.

[0005] Another object of the present disclosure is to provide a water desalination method, wherein the surface of the electrowetting device can be provided with a plurality of microstructures to produce a lotus effect. The lotus effect produced by combining the electrowetting technology with the microstructures can significantly enhance the fresh water attraction effect and greatly increase the amount of fresh water adsorbed by the electrowetting device, thereby effectively enhancing the water desalination efficiency and further reducing the water desalination cost.

[0006] According to the above-mentioned purpose of the present disclosure, a water desalination method is proposed. In this method, an electrowetting device is provided above the water to be desalinated, wherein the electrowetting device includes a conductive substrate and an insulating layer covering the surface of the conductive substrate. The electrowetting device adsorbs water vapor of the water to be desalinated above a surface of the insulating layer. A discharge device is used to perform a discharge treatment on the surface of the insulating layer so that the water vapor is charged. During the discharge treatment, electric power is applied to the conductive substrate so that the conductive substrate and the charged water vapor have different electrical properties, thereby being able to attract the charged water vapor onto the surface of the insulating layer and condense into water on the surface of the insulating layer. When the water on the surface of the insulating layer accumulates to a preset amount, the electrowetting device is transferred to the top of the fresh water collection tank, and the application of power is stopped.

[0007] According to an embodiment of the present disclosure, a surface of the electrowetting device includes a plurality of microstructures, and charged water vapor is adsorbed on the surface of the electrowetting device and condensed into water that fills between the microstructures.

[0008] According to an embodiment of the present disclosure, the surface of the conductive substrate includes a plurality of first microstructures, and the insulating layer conformally covers the surface of the conductive substrate.

[0009] According to an embodiment of the present disclosure, the surface of the conductive substrate is a plane, and the surface of the electrowetting device is a surface of the insulating layer.

[0010] According to an embodiment of the present disclosure, the electrowetting device further includes a nucleation layer disposed on a surface of the insulating layer.

[0011] According to an embodiment of the present disclosure, the discharge treatment includes utilizing a polarization method.

[0012] According to an embodiment of the present disclosure, the discharge device includes a corona discharge device or a direct current discharge device.

[0013] According to an embodiment of the present disclosure, the conductive substrate comprises a conductor material, a semiconductor material, or a combination thereof.

[0014] According to an embodiment of the present disclosure, the discharge device has a plurality of through holes, and water vapor can be charged by passing through the through holes.

[0015] According to an embodiment of the present disclosure, applying power to the conductive substrate includes applying high-voltage direct current to the conductive substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows:

[0017] Figure 1 is a schematic diagram of a water desalination device according to one embodiment of the present disclosure;

[0018] Figure 2 is a schematic diagram illustrating an electrowetting device according to one embodiment of the present disclosure;

[0019] Figure 3 is a schematic diagram illustrating another electrowetting device according to one embodiment of the present disclosure;

[0020] Figure 4 is a schematic diagram illustrating another electrowetting device according to one embodiment of the present disclosure; and

[0021] Figure 5FIG. 4 is a flow chart showing a water desalination method according to an embodiment of the present disclosure.

[0022]

Explanation of symbols

[0023] 100: Water desalination equipment

[0024] 200:Electrowetting device

[0025] 200a: Electrowetting device

[0026] 200b: Electrowetting device

[0027] 202a: Surface

[0028] 202b: Surface

[0029] 204a: Microstructure

[0030] 204b: Microstructure

[0031] 210: Conductive substrate

[0032] 210a: Conductive substrate

[0033] 210b: Conductive substrate

[0034] 212: Surface

[0035] 212a: Surface

[0036] 212b: Surface

[0037] 214a: First microstructure

[0038] 220: Insulation layer

[0039] 220a: Insulation layer

[0040] 220b: Insulation layer

[0041] 222: Surface

[0042] 222a: Surface

[0043] 222b: Surface

[0044] 230: Nucleation layer

[0045] 300: discharge device

[0046] 310: discharge electrode

[0047] 320: Power Grid

[0048] 400: Power supply source

[0049] 500: Fresh water collection tank

[0050] 600: Cavity

[0051] 610: Fluid inlet

[0052] 620: Fluid outlet

[0053] 700: water to be desalinated

[0054] 710: Liquid level

[0055] 800: Carrying mechanism

[0056] 900: Steps

[0057] 910: Steps

[0058] 920: Steps

[0059] 930: Steps DETAILED DESCRIPTION

[0060] In view of the fact that traditional water desalination technology is too energy-consuming and has high operating costs, the present disclosure proposes a water desalination method that is energy-saving and has low operating costs. The water desalination method disclosed herein utilizes a discharge device to perform discharge treatment on the surface of the insulating layer of an electrowetting device, so that the water vapor of the water to be desalinated attached to the surface of the insulating layer is charged, and the conductive substrate of the electrowetting device has an electrical property different from that of the water vapor. In this way, the Coulomb force can be used to attract the charged water vapor onto the surface of the insulating layer on the conductive substrate. When the amount of water condensed on the surface of the electrowetting device reaches a preset level, the desalinated water attracted and accumulated on the insulating layer of the electrowetting device can be released by stopping the application of electricity to the conductive substrate. Therefore, by applying the method disclosed herein, the energy required for desalination of water is quite low, and the cost can be greatly reduced.

[0061] In addition, in the water desalination method disclosed herein, the surface of the electrowetting device that attracts water vapor can be provided with many microstructures, and these microstructures can produce a lotus effect. The combination of electrowetting technology and the lotus effect can improve the efficiency of attracting water vapor and the amount of condensed water attracted, thereby further improving the efficiency of water desalination and reducing operating costs.

[0062] The water desalination method disclosed herein can be performed by using a water desalination device. Figure 1, which is a schematic diagram of a water desalination device according to an embodiment of the present disclosure. The water desalination device 100 may mainly include an electrowetting device 200, a discharge device 300, a power supply source 400, and a fresh water collection tank 500. Optionally, the water desalination device 100 may further include a cavity 600 to accommodate water 700 to be desalinated. The water 700 to be desalinated may be salt water such as seawater, or may be wastewater. In some examples, the cavity 600 has a fluid inlet 610 and a fluid outlet 620, and the water 700 to be desalinated may flow into the cavity 600 from the fluid inlet 610, and be desalinated in the cavity 600. The concentrated salt water or wastewater left after desalination can be discharged from the fluid outlet 620 to facilitate collection for further processing.

[0063] In some examples, the internal environment of the cavity 600 may be at atmospheric pressure and at room temperature. In other examples, the internal environment of the cavity 600 may have a specific pressure or temperature. The water vapor of the desalinated water 700 may be caused to evaporate by controlling the pressure and / or temperature of the internal environment of the cavity 600. For example, the internal environment of the cavity 600 may be controlled to have a pressure less than 1 atm and a temperature higher than room temperature but lower than the boiling point of water at this pressure.

[0064] In some examples, the electrowetting device 200 may be located in the cavity 600. The electrowetting device 200 is located above the liquid level 710 of the water to be desalinated 700 in the cavity 600. In other examples, the electrowetting device 200 may not be located in the cavity 600, but may be located above the cavity 600. In such an example, the cavity 600 may have an open accommodating space, that is, it does not have an upper cover so that the liquid level 710 of the water to be desalinated 700 in the cavity 600 is exposed.

[0065] Please refer to Figure 2 , which is a schematic diagram of an electrowetting device according to an embodiment of the present disclosure. The electrowetting device 200 may mainly include a conductive substrate 210 and an insulating layer 220. The conductive substrate 210 may include a conductive material, a semiconductor material, or a combination of a conductive material and a semiconductor material. For example, the material of the conductive substrate 210 may be metal. The conductive substrate 210 has a surface 212. Figure 2 In the embodiment of the present invention, the surface 212 of the conductive substrate 210 is a plane. The insulating layer 220 covers the surface 212 of the conductive substrate 210. In this embodiment, the insulating layer 220 may also have a flat surface 222. The insulating layer 220 may be hydrophobic or weakly hydrophilic to facilitate the release of water condensed thereon.

[0066] In some specific examples, the electrowetting device 200 may selectively include a nucleation layer 230. The nucleation layer 230 is disposed on the surface 222 of the insulating layer 220. The nucleation layer 230 may be a continuous layer and cover the entire surface 222 of the insulating layer 220. The nucleation layer 230 may also be a discontinuous layer and be partially disposed on the surface 222 of the insulating layer 220. The nucleation layer 230 has hydrophilic and water condensation properties, and water vapor can nucleate on the nucleation layer 230, which is beneficial for collecting water vapor. The thickness of the nucleation layer 230 is thin to facilitate the release of water condensed thereon. For example, a thermosensitive material has a hydrophilic property at a certain critical temperature, so the material of the nucleation layer 230 can be a thermosensitive material. The nucleation layer 230 can also be composed of other suitable materials that are not thermosensitive materials.

[0067] The electrowetting device of this embodiment may also have different designs. Figure 3 , which is a schematic diagram of another electrowetting device according to an embodiment of the present disclosure. The structure of the electrowetting device 200a is substantially the same as Figure 2 The structure of the electrowetting device 200 is similar to that of the electrowetting device 200a. The difference between the electrowetting device 200a and 200 is that the surface 202a of the electrowetting device 200a includes a plurality of microstructures 204a. In addition, the electrowetting device 200a includes a conductive substrate 210a and an insulating layer 220a, but does not include a nucleation layer. However, in some examples, the electrowetting device 200a may also additionally include the following Figure 2 The nucleation layer 230 is shown overlying the insulating layer 220a.

[0068] In the electrowetting device 200a, the insulating layer 220a covers the surface 212a of the conductive substrate 210a. In this example, the surface 212a of the conductive substrate 210a includes a plurality of first microstructures 214a. The insulating layer 220a may, for example, cover the surface 212a of the conductive substrate 210a in a conformal manner, so that the surface 202a of the constructed electrowetting device 200a includes a plurality of microstructures 204a. Figure 3 In the example, the surface 202a of the electrowetting device 200a is the surface 222a of the insulating layer 220a.

[0069] For example, these microstructures 204a can include nanostructures, micron structures, and / or millimeter structures. The shapes of these microstructures 204a can be designed according to actual needs such as manufacturing. For example, the microstructure 204a can be arc-shaped, conical, pyramidal or other suitable shapes. These microstructures 204a can produce lotus effect. By this, the contact angle between the condensed water adsorbed on the surface 202a of the electrowetting device 200a and the surface 202a can be reduced when the conductive substrate 210a is energized, and the hydrophilicity of the surface 202a of the electrowetting device 200a is improved, and then the amount of fresh water attached to the surface 202a can be increased. In addition, the contact angle between the condensed water adsorbed on the surface 202a of the electrowetting device 200a when the conductive substrate 210a is not powered and the surface 202a can be increased, thereby improving the hydrophobicity of the surface 202a of the electrowetting device 200a, thereby making it easier for water to leave the surface 202a of the electrowetting device 200a.

[0070] Please refer to Figure 4 , which is a schematic diagram of another electrowetting device according to an embodiment of the present disclosure. The structure of the electrowetting device 200b is substantially the same as Figure 3 The structure of the electrowetting device 200a is similar to that of the electrowetting device 200b. The difference between the electrowetting device 200b and 200a is that the surface 212b of the conductive substrate 210b of the electrowetting device 200b is a plane, and the surface 222b of the insulating layer 220b, which is the surface 202b of the electrowetting device 200b, includes many microstructures 204b. In other words, the microstructures 204b of the surface 202b of the electrowetting device 200b are defined by the structure of the insulating layer 220b. Similarly, these microstructures 204b may include nanostructures, microstructures, and / or millimeter structures. For example, these microstructures 204b may be arc-shaped, conical, pyramidal, or other suitable shapes.

[0071] exist Figure 4 In some examples, the electrowetting device 200b only includes the conductive substrate 210b and the insulating layer 220b, but does not include the nucleation layer. Similarly, in some examples, the electrowetting device 200b may also additionally include Figure 2 The nucleation layer 230 is shown overlying the insulating layer 220b.

[0072] Please refer again Figure 1In some examples, the discharge device 300 may be disposed in the cavity 600. The discharge device 300 may be located above the liquid level 710 of the water to be desalinated 700 in the cavity 600 and be separated from the liquid level 710 of the water to be desalinated 700 by a distance. The discharge device 300 may be located below the electrowetting device 200 and be separated from the electrowetting device 200. In other words, the discharge device 300 is between the liquid level 710 of the water to be desalinated 700 and the electrowetting device 200. In the example where the electrowetting device 200 is located above the cavity 600 instead of being located in the cavity 600, the discharge device 300 may be located in the cavity 600, or may be located outside the cavity 600.

[0073] The discharge device 300 can perform a discharge process toward the insulating layer 220 of the electrowetting device 200 to emit charges, such as negatively charged electrons, positively charged gas, etc., toward the surface 222 of the insulating layer 220 of the electrowetting device 200, so as to charge the water vapor attached to the surface 222 of the insulating layer 220. The discharge device 300 can be, for example, but not limited to, a corona discharge device or a direct current discharge device. The discharge device 300 is air-permeable and allows the water vapor of the water to be desalinated 700 to pass through. That is, the discharge device 300 has a plurality of through holes, and the water vapor of the water to be desalinated 700 can enter the discharge device 300 through these through holes and be charged.

[0074] In some examples, such as Figure 1 As shown, the discharge device 300 may include a discharge electrode 310 and a power grid 320. By applying different potentials to the discharge electrode 310, the power grid 320, and the conductive substrate 210, the surface 222 of the insulating layer 220 or the nucleation layer 230 may be polarized, thereby charging the surface 222 of the insulating layer 220 or the water vapor above the nucleation layer 230. For example, a positive potential may be applied to the conductive substrate 210, a negative potential may be applied to the discharge electrode 310, and a negative potential lower than that of the discharge electrode 310 may be applied to the power grid 320.

[0075] The power supply source 400 can be electrically connected to the conductive substrate 210 of the electrowetting device 200, and can apply power to the conductive substrate 210. In this way, the conductive substrate 210 and the water vapor charged by the discharge device 300 have different electrical properties. Therefore, after the charged water vapor passes through the discharge device 300, it can be attracted by the electrowetting device 200 due to the Coulomb force, and then adsorbed on the insulating layer 220 or the nucleation layer 230. In some examples, the power supply source 400 can be a high-voltage direct current power supply source, and the high-voltage direct current is applied to the conductive substrate 210.

[0076] The fresh water collection tank 500 can be, for example, disposed adjacent to the cavity 600. The fresh water collection tank 500 can be used to collect fresh water condensed and accumulated on the electrowetting device 200. When the water above the surface 222 of the insulating layer 220 of the electrowetting device 200 accumulates to a preset amount, the electrowetting device 200 can be transferred to the top of the fresh water collection tank 500, and the application of power to the conductive substrate 210 is stopped. At this time, the surface 222 of the insulating layer 220 is transformed into a hydrophobic property, and the water above the surface 222 of the insulating layer 220 can be smoothly separated and fall into the fresh water collection tank 500 below.

[0077] Please continue to refer to Figure 1 The water desalination device 100 may selectively include a supporting mechanism 800. The electrowetting device 200 may be disposed on the supporting mechanism 800 and held by the supporting mechanism 800. The supporting mechanism 800 may be a rotatable mechanism or a movable mechanism. When the amount of fresh water adsorbed by the electrowetting device 200 reaches a preset value, the electrowetting device 200 may be carried to the top of the fresh water collection tank 500 by rotating or moving the supporting mechanism 800 to desorb and collect the fresh water on the electrowetting device 200. In some examples, the water desalination device 100 may include two or more electrowetting devices 200 to simultaneously adsorb water vapor of the water to be desalinated and desorb and collect the desalinated water.

[0078] Please also refer to Figure 1 and Figure 5 ,in Figure 5 1 is a flow chart illustrating a water desalination method according to an embodiment of the present disclosure. When desalinating salt water or wastewater, step 900 may be performed first to provide an electrowetting device 200, and the electrowetting device 200 may be disposed above the liquid level 710 of the water 700 to be desalinated. The surface 222 of the insulating layer 220 of the electrowetting device 200 faces the liquid level 710 of the water 700 to be desalinated. The electrowetting device 200 may adsorb water vapor of the water 700 to be desalinated on the surface 222 of the insulating layer 220. The electrowetting device 200 may also Figure 3 The electrowetting device 200a or Figure 4 The structures and characteristics of the electrowetting devices 200, 200a, and 200b have been described above and will not be repeated here.

[0079] At the same time, step 910 may be performed to provide a discharge device 300. In some exemplary examples, the discharge device 300 may be disposed above the liquid level 710 of the water to be desalinated 700 and below the surface 222 of the insulating layer 220 of the electrowetting device 200. Next, the discharge device 300 is used to perform a discharge process toward the surface 222 of the insulating layer 220 to emit charges, such as negatively charged electrons, positively charged gas, etc., toward the surface 222 of the insulating layer 220, thereby charging the water vapor attached to the surface 222 of the insulating layer 220. In some examples, the discharge device 300 may generate plasma and charge the water vapor by polarization. The discharge device 300 may generate an ion wind, which may cause the water vapor of the water to be desalinated 700 to move to the electrowetting device 200. In addition, the water vapor of the water to be desalinated 700 will also be charged when passing through the discharge device 300.

[0080] At this time, step 920 may be performed to apply power to the conductive substrate 210 of the electrowetting device 200 when the discharge device 300 performs a discharge process, such as applying a high voltage direct current to the conductive substrate 210, so that the conductive substrate 210 and the charged water vapor on the insulating layer 220 have different electrical properties. In this way, the charged water vapor can be attracted above the surface 222 of the insulating layer 220 and condensed into water on the surface 222 of the insulating layer 220 or the nucleation layer 230. The electrowetting device 200 can promote the hydrophilicity of the surface 222 of the insulating layer 220 or the nucleation layer 230, thereby accelerating the condensation speed of the water vapor and greatly increasing the water capacity that the electrowetting device 200 can adsorb.

[0081] In the example of using the electrowetting device 200a or 200b, the lotus effect generated by the microstructure 204a or 204b, combined with the electrowetting effect, can enhance the hydrophilicity of the surface 222 of the insulating layer 220 or the nucleation layer 230. Therefore, the condensation speed of water vapor can be further accelerated, and the condensed water can be filled between these microstructures 204a or 204b, and the water capacity that the electrowetting device 200a or 200b can absorb can be significantly increased.

[0082] Please refer again Figure 5 , step 930 can be performed, so that when the water on the surface 222 of the insulating layer 220 accumulates to a preset amount, the electrowetting device 200 can be transferred to the fresh water collection tank 500 by using the supporting mechanism 800. Then, the power supply source 400 is turned off to stop applying power to the conductive substrate 210. At this time, the surface 222 of the insulating layer 220 changes from hydrophilic to hydrophobic, and the water adsorbed on the surface 222 of the insulating layer 220 can be smoothly detached and fall into the fresh water collection tank 500 below by its own gravity.

[0083] By applying power to the electrowetting device 200 and discharging on the surface of the electrowetting device 200, the condensation of water vapor can be accelerated and the absorbed water capacity can be increased. By stopping the application of power to the electrowetting device, the fresh water adsorbed by the electrowetting device 200 can be separated. Therefore, the water desalination method of this embodiment does not require a large amount of energy to desalinate salt water or wastewater, which is quite energy-saving and can significantly reduce the cost of water desalination.

[0084] In the case where the nucleation layer 230 is made of a thermosensitive material, the nucleation layer 230 can be turned into a hydrophobic material by increasing the temperature to a temperature exceeding the critical temperature of the thermosensitive material. Thus, the water adsorbed on the nucleation layer 230 can be smoothly separated and fall into the fresh water collection tank 500 due to its own gravity.

[0085] It can be seen from the above embodiments that one advantage of the present disclosure is that the water desalination method of the present disclosure can charge the water vapor of the water body to be desalinated, and use the electrowetting device to attract the water vapor through the Coulomb force, and then release the fresh water condensed on the electrowetting device by stopping the power supply. In this way, water desalination can be successfully completed under low energy consumption, so the cost of water desalination can be greatly reduced.

[0086] Another advantage of the present disclosure is that the surface of the electrowetting device of the water desalination method of the present disclosure can be provided with many microstructures to produce a lotus effect. The lotus effect produced by combining the electrowetting technology with the microstructure can significantly improve the fresh water attraction effect and greatly increase the amount of fresh water adsorbed by the electrowetting device, thereby effectively improving the water desalination efficiency and further reducing the water desalination cost.

[0087] Although the present disclosure has been disclosed as above by way of embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the scope defined in the attached claims.

Claims

1. A water desalination method, characterized in that: The water desalination method comprises: Providing an electrowetting device above water to be desalinated, wherein the electrowetting device comprises a conductive substrate and an insulating layer covering a surface of the conductive substrate, and the electrowetting device adsorbs water vapor of the water to be desalinated above a surface of the insulating layer; Using a discharge device to perform a discharge treatment on the surface of the insulating layer so as to charge the water vapor; When performing the discharge treatment, an electric force is applied to the conductive substrate so that the conductive substrate and the charged water vapor have different electrical properties, thereby attracting the charged water vapor onto the surface of the insulating layer and condensing into water on the surface of the insulating layer; as well as When the water on the surface of the insulating layer accumulates to a preset amount, the electrowetting device is transferred to a fresh water collection tank, and the application of the electric power is stopped to transform the surface of the insulating layer into a hydrophobic property, thereby causing the water on the surface of the insulating layer to fall off and fall into the fresh water collection tank.

2. The water desalination method according to claim 1, characterized in that: A surface of the electrowetting device includes a plurality of microstructures. The charged water vapor is adsorbed on the surface of the electrowetting device and condensed into water filling between the plurality of microstructures.

3. The water desalination method according to claim 2, characterized in that: The surface of the conductive substrate comprises a plurality of first microstructures, and the insulating layer conformally covers the surface of the conductive substrate.

4. The water desalination method according to claim 2, characterized in that: The surface of the conductive substrate is a plane, and the surface of the electrowetting device is the surface of the insulating layer.

5. The water desalination method according to claim 1, characterized in that: The electrowetting device also includes a nucleation layer disposed on the surface of the insulating layer.

6. The water desalination method according to claim 1, characterized in that: The discharge process includes utilizing a polarization method.

7. The water desalination method according to claim 1, characterized in that: The discharge device includes a corona discharge device or a DC discharge device.

8. The water desalination method according to claim 1, characterized in that: The conductive substrate includes a conductor material, a semiconductor material, or a combination thereof.

9. The water desalination method according to claim 1, characterized in that: The discharge device has a plurality of through holes, and the water vapor can be charged by passing through the plurality of through holes.

10. The water desalination method according to claim 1, characterized in that: Applying the power to the conductive substrate includes applying high voltage direct current to the conductive substrate.

Images