Treatment system for removing scale-forming ions in water body and working method

Abstract

The invention discloses a treatment system for removing scale-forming ions in a water body and a working method.The treatment system comprises an anode plate, an anode diaphragm, a cathode diaphragm and a cathode plate, and an anode chamber, a deionized water chamber and a cathode chamber which are mutually independent, and aqueous solutions in the anode chamber and the deionized water chamber can be mutually communicated only through a micropore structure on the surface of the anode diaphragm; and the aqueous solution in the cathode chamber and the aqueous solution in the deionized water chamber can be communicated with each other only through the microporous structure on the surface of the cathode diaphragm. According to the invention, the membrane permeation mass transfer mechanism is applied in the electrochemical reaction process, so that ions in the system are enriched on the surfaces of two poles and are removed through reaction, the descaling efficiency of the reactor is improved, and the method has the characteristics of strong applicability and simple operation steps.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a treatment system and a working method for removing scale-forming ions in water. Background Art

[0002] In the traditional electrochemical water hardness removal technology, under the action of the electric field force of the positive and negative electrodes, Ca 2+ Mg 2+ Isotropic cations will migrate and accumulate toward the cathode. The electrolysis reaction occurring in the cathode interface area will form a high alkalinity area, which will promote the crystallization of scaling ions and the precipitation of hydrogen as a by-product. The anode interface area is acidic, and oxygen, chlorine or ozone will be precipitated as by-products. Researchers have proposed various forms of electrochemical descaling reactors, and multi-chamber reactors are an important type of them. Multi-chamber reactors are different from multi-stage reactors connected in series and parallel. They usually use membranes to separate the reaction chambers into multiple parts. The anode chamber, intermediate chamber and cathode chamber in the reaction chamber are independent of each other. The bottom of the anode chamber, intermediate chamber and cathode chamber are independently provided with water inlet pipes. Under the action of the pump, the water body is divided into multiple streams, which enter the anode chamber, intermediate chamber and cathode chamber respectively.

[0003] In multi-chamber electrochemical reactors represented by chlor-alkali electrolyzers, ion exchange membranes are used as inter-electrode membranes to separate the reaction areas. Using ion exchange membranes between the electrodes of electrochemical hardness removal equipment can avoid mixing of acid and alkali solutions near the cathode and anode, and improve the degree of alkalinity and acidification in the electrode interface area and the ion removal rate in the solution. (1) Existing multi-chamber reactors have high requirements for the sealing of the membrane stack flow channel. The flow channel design is complex and is usually a closed structure that is not conducive to exhaust. When adjustment, maintenance or cleaning of plate / diaphragm scale is required, the water pump must be turned off in advance and then the reactor is opened. The operation process is cumbersome and affects the normal circulation of the water body; (2) The diaphragms used in existing multi-chamber reactors usually have high production costs and are prone to clogging or even irreversible damage in actual use, reducing their service life.

[0004] The patent with publication number "CN108706692A" and patent name "Multi-stage chamber multi-element catalytic electrode electrochemical reactor" adopts multi-stage chamber and multi-element catalytic electrode, but the defect is that the reactor has a single air inlet, the cathode in the embodiment is cylindrical and cannot clean the surface deposits, and the internal structure of the closed reactor is difficult to maintain; the patent with publication number "CN113401984A" and patent name "Separation device and water treatment equipment thereof" uses bipolar membranes, that is, each bipolar membrane is composed of a cation exchange membrane and an anion exchange membrane bonded together. The defects are that the ion exchange membrane has a short service life and is expensive, and the porous electrode is easily blocked by the electric reaction products during use; the patent with publication number "CN115611369A" and patent name "A fixed bed three-dimensional electrode electrochemical descaling device and its working method" uses particle electrodes in combination with anodes and cathodes. The defects are that the particle electrodes have high resistivity, increase the reaction voltage and greater risk, and cleaning of the particle electrodes requires chemical methods, which is cumbersome and costly. Summary of the Invention

[0005] Purpose of the invention: The present invention proposes a treatment system and working method for removing scale-forming ions from water bodies, which uses an electrochemical reactor with a cathode + double diaphragm + anode structure as the core component. The scale-forming ions in the water body are removed through electric field force, electrochemical reaction process, and membrane osmosis mass transfer mechanism, thereby improving the scale removal efficiency of the reactor.

[0006] Technical solution: The present invention proposes a treatment system for removing scale-forming ions from water, comprising a deionized water tank, an anode water tank, a cathode water tank, a reaction chamber located between the anode water tank and the cathode water tank, a water storage tank, and a DC power supply; the anode water tank and the reaction chamber are separated by an anode separator, and the cathode water tank and the reaction chamber are separated by a cathode separator; an anode plate, an anode diaphragm, a cathode diaphragm, and a cathode plate are provided in the reaction chamber, the anode separator, the anode diaphragm, and the inner wall of the reaction chamber form an anode chamber, the anode plate is located in the anode chamber, and the anode separator is provided with an anode chamber water outlet connecting the anode chamber and the anode water tank; the cathode separator, the cathode diaphragm, and the inner wall of the reaction chamber form a cathode chamber, the cathode plate is located in the cathode chamber, and the cathode separator is provided with a cathode chamber water inlet connecting the cathode chamber and the cathode water tank; the anode diaphragm, the cathode diaphragm, and the inner wall of the reaction chamber form a deionized water chamber;

[0007] A DC power supply is connected to the anode plate and cathode plate respectively. The water storage tank is connected to the anode chamber, deionized water chamber and cathode chamber and is used to supply water to the anode chamber, deionized water chamber and cathode chamber. The deionized water chamber is connected to the deionized water pool.

[0008] Preferably, a circulating water pool is further included, and the water storage tank, anode water pool, cathode water pool and deionized water pool are all connected to the circulating water pool.

[0009] Preferably, the water storage tank is located below the anode chamber, the deionized water chamber and the cathode chamber, the water outlet of the circulating water pool is connected to the water inlet of the water storage tank, and the water level in the water storage tank rises and flows into the anode chamber, the deionized water chamber and the cathode chamber respectively.

[0010] Preferably, the anode plate is lower than the height of the anode diaphragm and the anode separator, and the cathode plate is lower than the height of the cathode diaphragm and the cathode separator.

[0011] Preferably, the reaction chamber water inlet forms an anode chamber water inlet between the anode diaphragm and the anode plate, the reaction chamber water inlet forms a deionization chamber water inlet between the anode diaphragm and the cathode diaphragm, and the reaction chamber water inlet forms a cathode chamber water inlet between the cathode diaphragm and the cathode plate.

[0012] Preferably, the bottom end of the anode separator is provided with an anode chamber water outlet, the bottom end of the cathode separator is provided with a cathode chamber water outlet, and the upper end of the reactor shell of the deionized water chamber is provided with a deionized chamber water outlet.

[0013] Preferably, the thickness of the anode separator and the cathode separator is 0.1-0.5 mm, and there is a microporous structure on the anode separator and the cathode separator, and the size of the micropores is 1-50 μm.

[0014] Preferably, the anode plate material is a titanium-based DSA electrode, and the cathode plate material is a stainless steel or titanium dense plate electrode; the distance between the cathode diaphragm and the cathode plate is 0-1 cm, and the distance between the anode diaphragm and the anode plate is 0-1 cm.

[0015] Preferably, the top surface of the water storage tank is further provided with a first fixing plate and a second fixing plate, and the anode diaphragm, cathode diaphragm, anode plate and cathode plate are fixed in the reactor shell via the first fixing plate and the second fixing plate.

[0016] A method for removing scale-forming ions from a water treatment system comprises the following steps:

[0017] Step 1: The output water of the circulating water pool enters the water tank through the water inlet of the water reservoir. The water level in the water tank continues to rise and flows into the anode chamber, deionized water chamber and cathode chamber through the anode chamber inlet, deionized water chamber inlet and cathode chamber inlet respectively;

[0018] Step 2: After the DC power supply is powered on, a water decomposition voltage is applied between the anode plate and the cathode plate. Under the action of the electric field, an acidic area is formed in the anode chamber and an alkaline area is formed in the cathode chamber. After the scaling ions reach saturation in the cathode chamber, they precipitate on the cathode diaphragm and the cathode plate to form scale. The water treated by the cathode chamber flows into the cathode water tank from the cathode chamber outlet. The water mixed with the precipitate can be precipitated in the cathode water tank to obtain an aqueous solution that flows into the circulating water tank for continued use. The effluent from the anode chamber flows into the anode water tank through the anode chamber outlet, and the effluent from the deionized water chamber flows into the deionized water tank through the deionized water chamber outlet. The aqueous solutions of the anode water tank and the deionized water tank flow into the circulating water tank and continue to circulate to the water storage tank.

[0019] Step 3: After the preset cycle is reached, clean the cathode diaphragm and cathode plate with scale on the surface and continue to use them.

[0020] Beneficial effects: The present invention is an open multi-chamber reactor. When the reactor needs to be adjusted or maintained, the above work can be completed without shutting down the water pump and opening the reactor. If it is necessary to clean the scale on the plate or diaphragm, the plate or diaphragm can be directly removed from the slot in the reaction chamber, which simplifies the operation process and does not affect the normal circulation of the water body; the water outlet of each chamber can be collected separately from the water outlet at the top of the reactor and put into different uses; under the action of the electric field force, the cathode surface area promotes the supersaturated concentration of the precipitate in the liquid phase to be in the metastable zone under the dual action of hydrogen bubble squeezing and cross-flow water flushing, so that the generated precipitate is preferentially precipitated on the surface of the diaphragm and the particles attached to its surface, and the surface of the suspended particles. The existing precipitate grains will play the role of crystal seeds in the growth process of new precipitates. The above process improves the removal efficiency of scale-forming ions; the diaphragms used cover a wide range. In terms of their cost and service life, they range from low to high and from short to long, but all of them can effectively improve the descaling efficiency of the reactor and can be selected according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the processing system of the present invention;

[0022] Figure 2 This is a schematic diagram of the working principle of the processing system of the present invention;

[0023] Figure 3 This is the overall structural diagram of the reactor and water storage tank of the present invention;

[0024] Figure 4 It is a top view of the reactor and water storage tank of the present invention. DETAILED DESCRIPTION

[0025] like Figure 1-3As shown, a treatment system for removing scale-forming ions from water provided by the present invention includes an electrochemical reactor for removing scale-forming ions from water, an external DC power supply, an anode water tank, a deionized water tank, a circulating water tank, and a cathode water tank, wherein the positive electrode of the external DC power supply is connected to the anode plate, and the negative electrode of the external DC power supply is connected to the cathode plate;

[0026] The cathode water tank 11 is connected to the cathode chamber outlet 15 at the bottom of the cathode chamber 6; the deionized water tank 10 is connected to the deionized water chamber outlet 14 at the top of the deionized water chamber 4 via a pipe; the anode water tank 12 is connected to the anode chamber outlet 13 at the bottom of the anode chamber 2; the water in the cathode water tank 11, the deionized water tank 10, and the anode water tank 12 all enter the circulating water tank 9 through pipes; the circulating water tank 9 is connected to the water tank inlet 8 via a pipe. The electrochemical reactor for removing scale ions from water includes a square reactor shell 16, in which are arranged, from left to right, an anode separator 17, an anode plate 1, an anode diaphragm 3, a cathode diaphragm 5, a cathode plate 7, and a cathode separator 18.

[0027] The anode separator 17, the anode plate 1, the anode diaphragm 3, the cathode diaphragm 5, the cathode plate 7 and the cathode separator 18 are arranged parallel to each other. An independent anode chamber 2 is formed between the anode separator 17 and the anode diaphragm 3, an independent deionized water chamber 4 is formed between the anode diaphragm 3 and the cathode diaphragm 5, and an independent cathode chamber 6 is formed between the cathode diaphragm 5 and the cathode plate 7. The aqueous solutions in the anode chamber 2 and the deionized water chamber 4 can only be connected to each other through the microporous structure on the surface of the anode diaphragm 3, and the aqueous solutions in the cathode chamber 6 and the deionized water chamber 4 can only be connected to each other through the microporous structure on the surface of the anode diaphragm 3. The cathode diaphragm 5 is interconnected through the microporous structure on the surface, and the size of the micropores is 1-50μm. Under the action of the electric field force, the presence of the micropores allows anions and cations in the solution to pass through the micropores and migrate toward the cathode and anode under the action of the electric field force. When there are crystal seeds of precipitates on the micropore surface, water hardness substances will be more easily and preferentially precipitated on the diaphragm surface, which greatly alleviates the scaling problem on the electrode surface. If the micropores are too small, it will affect the ion mass transfer rate in the solution, and if the micropores are too large, it will weaken the confinement effect of the diaphragm on the ions.

[0028] A square water tank 19 is provided at the bottom of the reactor shell 16. The water tank 19 is sealed and fixedly connected to the adjacent end face of the reactor shell 16. The water tank 19 is interconnected with the anode chamber water inlet 21, the deion chamber water inlet 22, and the cathode chamber water inlet 23. A water tank inlet 8 is opened on the side wall at one end of the water tank, and the water tank inlet 8 is interconnected with the circulating water pool 9 through a pipe.

[0029] An anode chamber water inlet 21 is provided at the bottom of the anode chamber 2, and the anode chamber water inlet 21 is located between the anode plate 1 and the anode diaphragm 3 below the anode chamber 2. The anode chamber water outlet 13 is located below the anode separator 17 of the anode chamber 2, and the anode chamber water inlet 21 and the anode chamber water outlet 13 are both interconnected with the anode chamber 2; a deionized water chamber outlet 14 and a deionized water chamber inlet 22 are respectively provided at the top and bottom of the deionized water chamber 4, and the deionized water chamber outlet 14 and the deionized water chamber inlet 22 are both interconnected with the deionized water chamber 4, and a cathode chamber water inlet 23 is provided at the bottom of the cathode chamber 6, and the cathode chamber water inlet 23 is located between the cathode plate 7 and the cathode diaphragm 5 below the cathode chamber 6, and the cathode chamber water outlet 15 is located below the cathode separator 18 of the cathode chamber 6, and the cathode chamber water outlet 15 and the cathode chamber water inlet 23 are both interconnected with the cathode chamber 6.

[0030] The anode separator 3 and cathode separator 5 include microporous membranes, porous membranes, mesh membranes, cloth membranes, filler membranes, or membranes of corresponding materials that have undergone hydrophilic and hydrophobic modification. The spacing between the cathode separator 5 and the cathode plate 7 is 0-1 cm. This 0-1 cm membrane spacing provides a certain space for cation enrichment. The separator also provides a relatively stable confined environment for the precipitation and crystal growth of precipitates. The gap between the separator and the electrode can accommodate the accumulation and discharge of gases and promote effective mass transfer between the separator and the electrode.

[0031] The distance between the anode diaphragm 3 and the anode plate 1 is 0-1 cm. The 0-1 cm membrane-electrode distance provides a certain space for the enrichment of anions. The diaphragm also provides a relatively stable confined environment for ions. The gap between the diaphragm and the electrode can adapt to the accumulation and discharge of gas and promote effective mass transfer between the diaphragm and the electrode.

[0032] The thickness of the anode diaphragm 3 is 0.1-0.5 mm. The thickness of the cathode diaphragm 5 is 0.1-0.5 mm. The anode plate 1 utilizes a titanium-based ruthenium-iridium metal oxide dense plate electrode, and the cathode plate 7 utilizes a stainless steel dense plate electrode or a stainless steel electrode. The anode diaphragm 3 and cathode diaphragm 5 are secured to the reactor via the upper fixing plates 17 and 18 of the water storage tank 19. The anode plate 1 and cathode plate 7 are secured to the reactor via the upper fixing plates 17 and 18 of the water storage tank 19 and adhere to the reactor shell 16.

[0033] In one embodiment, the spacing between cathode diaphragm 5 and cathode plate 7 is 5 mm, and the spacing between anode diaphragm 3 and anode plate 1 is 5 mm. Anode diaphragm 3 has a thickness of 0.3 mm. Cathode diaphragm 5 has a thickness of 0.3 mm. Anode plate 1 utilizes a titanium-based ruthenium-iridium metal oxide dense plate electrode (self-made), and cathode plate 7 utilizes a stainless steel dense plate electrode (SS904L).

[0034] Example 2

[0035] The working principle of the present invention is:

[0036] The water output from the circulating water pool 9 enters the water storage tank 19 through the water inlet 8. The water level in the water storage tank 19 continues to rise and flows through the anode chamber water inlet 21, the deionized water chamber water inlet 22, and the cathode chamber water inlet 23 into the anode chamber 2, the deionized water chamber 4, and the cathode chamber 6.

[0037] When the DC power supply 20 is powered, a water decomposition voltage is applied between the anode plate 1 and the cathode plate 7. Under the action of the electric field, acidic and alkaline (high pH environment) areas are formed near the anode and cathode respectively. The scale-forming ions (Ca 2+ Mg 2+ ) reaches saturation in a high pH environment, and preferentially precipitates on the cathode diaphragm 5 and the solid matter attached to its surface to form scale. Due to the confining effect of the diaphragm, other cations in the raw water are enriched in the cathode chamber 6 under the action of the electric field force, and flow through the cathode chamber outlet 15 through the pipeline into the cathode water tank 11. The water mixed with the precipitate can be precipitated in the cathode water tank 11, and the precipitate solid can be separated and then continued to be used; the precipitate can also be filtered using a filtering device, and the obtained aqueous solution can flow into the circulating water tank 9 and continue to be put into use, wherein the effluent from the anode chamber 2 and the effluent from the deionized water chamber 4 flow into the anode water tank 12 and the deionized water tank 11 through the anode chamber outlet 13 and the deionized water chamber outlet 14 respectively, and are collected and flow into the circulating water tank 9, mixed, and then continue to circulate.

[0038] After running the preset cycle, scale is attached to the surface of the cathode diaphragm 5 and the cathode plate 7. The surface scale can be removed manually or automatically (using high-pressure water jet to flush the plates) according to the scale generation and distribution.

[0039] Example 3:

[0040] The present embodiment proposes a treatment system for removing scale ions from water, comprising a reactor shell 16, an anode plate 1, an anode diaphragm 3, a cathode diaphragm 5, a cathode plate 7, a water storage tank 19, and a DC power supply 20; an anode water pool 12 and a cathode water pool 11 separated by an anode diaphragm 17 and a cathode diaphragm 18 inside the reactor shell 16, and a reaction chamber; an anode plate 1, an anode diaphragm 3, a cathode diaphragm 5, and a cathode plate 7 are arranged in parallel in sequence inside the reaction chamber, the anode diaphragm 17 and the anode diaphragm 3 and the inner wall of the reactor shell 16 form an anode chamber 2, and the cathode diaphragm 18 and the cathode diaphragm 3 and the inner wall of the reactor shell 16 form a cathode chamber. The deionized water chamber 4 is formed by a chamber 6, an anode diaphragm 3, a cathode diaphragm 5 and an inner wall of a reactor shell 16; a DC power supply 20 is connected to the anode plate 1 and the cathode plate 7 respectively; a water storage tank 19 is provided at the bottom of the reactor shell 16, and a reaction chamber water inlet is provided on the upper end surface of the water storage tank 19. The reaction chamber water inlet is located between the anode plate 1 and the cathode plate 7 and is respectively connected to the anode chamber 2, the cathode chamber 6 and the deionized water chamber 4; the anode chamber 2 is connected to the anode water tank 12 through the anode chamber water outlet 13, the cathode chamber 6 is connected to the cathode water tank 11 through the cathode chamber water inlet 23, and the deionized water chamber 4 is connected to the deionized tank 10 through the deionized chamber water outlet 14.

[0041] The anode water tank 12, cathode water tank 11, and deionized water tank 10 are all connected to the circulating water tank 9, which is connected to the water tank inlet 8 via a pipe. The anode plate 1 is lower than the height of the anode diaphragm 3 and anode separator 17, while the cathode plate 7 is lower than the height of the cathode diaphragm 5 and cathode separator 18. The reaction chamber water inlet forms an anode chamber water inlet 21 between the anode diaphragm 3 and anode plate 1. The reaction chamber water inlet forms a deionized chamber water inlet 22 between the anode diaphragm 3 and cathode diaphragm 5. The reaction chamber water inlet forms a cathode chamber water inlet 23 between the cathode diaphragm 5 and cathode plate 7. The anode chamber water outlet 13 is located at the bottom of the anode separator 17, the cathode chamber water outlet 15 is located at the bottom of the cathode separator 5, and the deionized chamber water outlet 14 is located at the top of the reactor shell 16 of the deionized water chamber 4.

[0042] The cathode plate 7 adopts a stainless steel dense plate electrode (SS904L), and the anode plate 1 adopts a titanium-based ruthenium-iridium metal oxide dense plate electrode (self-made), a single-cell structure (the cathode and anode are equal in size and parallel to each other, the electrode area is 6cm×7cm, and the inter-electrode distance is 2cm). A double-layer PP non-woven fabric diaphragm is placed in the middle of the electrode, with an average pore size of 3μm and a diaphragm thickness of 0.3mm. The two layers of PP non-woven fabric are composited and lined with nylon reinforcing ribs in the middle. The diaphragm is pre-impregnated with 0.1%wt calcium carbonate slurry; the diaphragm and the anode and cathode are equal in size and parallel to each other, and the anode and cathode membrane inter-electrode distance is about 3mm.

[0043] Circulating water was introduced into the water storage tank 19, and the water flow rate was controlled to be 107 L / h (hydraulic retention time 4 s). The equipment was powered on (tank voltage 7 V). The initial hardness of the aqueous solution was 500 mg / L, the initial conductivity was 2000 μs / cm, and the current density was maintained at 4 mA / cm. 2 Under the action of the electric field force, the ions in the solution migrate directionally to the positive and negative electrodes. The effluent water solution from the cathode chamber formed between the cathode and the diaphragm is turbid and contains a large number of suspended scale particles. The water solution is discharged into the sedimentation tank and then precipitated for 15 minutes to obtain a clear water solution. When the equipment treats 6L of dynamic hard water, the hardness of the system water solution drops to 210mg / L after 6 hours of continuous operation, and the conductivity drops from 2000μs / cm to 1310μs / m. There is no obvious scale deposition on the cathode surface. At the same time, the conductivity of the deionized water area is significantly lower than the conductivity of the system water solution.

[0044]

Claims

1. A treatment system for removing scale-forming ions from water, characterized in that: The invention comprises a deionized water pool (10), an anode water pool (12), a cathode water pool (11), a reaction chamber located between the anode water pool (12) and the cathode water pool (11), a water storage tank (19) and a DC power supply (20); the anode water pool (12) and the reaction chamber are separated by an anode separator (17), and the cathode water pool (11) and the reaction chamber are separated by a cathode separator (18); the reaction chamber is provided with an anode plate (1), an anode diaphragm (3), a cathode diaphragm (5) and a cathode plate (7); the anode separator (17), the anode diaphragm (3) and the reaction chamber are provided with a cathode separator (18); The walls of the reaction chamber form an anode chamber (2), the anode plate (1) is located in the anode chamber (2), and the anode separator (17) is provided with an anode chamber water outlet (13) to connect the anode chamber (2) and the anode water tank (12); the cathode separator (18), the cathode diaphragm (3) and the inner wall of the reaction chamber form a cathode chamber (6), the cathode plate (7) is located in the cathode chamber (6), and the cathode separator (18) is provided with a cathode chamber water inlet (23) to connect the cathode chamber (6) and the cathode water tank (11); the anode diaphragm (3), the cathode diaphragm (5) and the inner wall of the reaction chamber form a deionized water chamber (4); A direct current power supply (20) is connected to the anode plate (1) and the cathode plate (7) respectively; a water storage tank (19) is connected to the anode chamber (2), the deionized water chamber (4) and the cathode chamber (6) and is used to supply water to the anode chamber (2), the deionized water chamber (4) and the cathode chamber (6); and the deionized water chamber (4) is connected to the deionized water pool (10).

2. The treatment system for removing scale-forming ions from water according to claim 1, characterized in that: It also includes a circulating water pool (9), and the water storage tank (19), the anode water pool (12), the cathode water pool (11) and the deionized water pool (10) are all connected to the circulating water pool (9).

3. The electrochemical reactor for removing scale-forming ions from water according to claim 1, characterized in that: The water storage tank (19) is located below the anode chamber (2), the deionized water chamber (4) and the cathode chamber (6). The water outlet of the circulating water pool (9) is connected to the water inlet of the water storage tank (19). After the water level in the water storage tank (19) rises, the water flows into the anode chamber (2), the deionized water chamber (4) and the cathode chamber (6).

4. The treatment system for removing scale-forming ions from water according to claim 1, characterized in that: The anode plate (1) is lower than the height of the anode diaphragm (3) and the anode separator (17), and the cathode plate (7) is lower than the height of the cathode diaphragm (5) and the cathode separator (18).

5. The treatment system for removing scale-forming ions from water according to claim 1, characterized in that: The reaction chamber water inlet forms an anode chamber water inlet (21) between the anode diaphragm (3) and the anode plate (1), the reaction chamber water inlet forms a deionization chamber water inlet (22) between the anode diaphragm (3) and the cathode diaphragm (5), and the reaction chamber water inlet forms a cathode chamber water inlet (23) between the cathode diaphragm (5) and the cathode plate (7).

6. The treatment system for removing scale-forming ions from water according to claim 1, characterized in that: The bottom end of the anode separator (17) is provided with an anode chamber water outlet (13), the bottom end of the cathode separator (5) is provided with a cathode chamber water outlet (15), and the upper end of the reactor shell (16) of the deionized water chamber (4) is provided with a deionized chamber water outlet (14).

7. The electrochemical reactor for removing scale-forming ions from water according to claim 2, characterized in that: The thickness of the anode diaphragm (3) and the cathode diaphragm (5) is 0.1-0.5 mm. There are micropore structures on the anode diaphragm (3) and the cathode diaphragm (5), and the size of the micropores is 1-50 μm.

8. The treatment system for removing scale-forming ions from water according to claim 1, characterized in that: The material of the anode plate (1) is a titanium-based DSA electrode, and the material of the cathode plate (7) is a stainless steel or titanium dense plate electrode; the spacing between the cathode diaphragm (5) and the cathode plate (7) is 0-1 cm, and the spacing between the anode diaphragm (3) and the anode plate (1) is 0-1 cm.

9. The treatment system for removing scale-forming ions from water according to claim 1, characterized in that: The top surface of the water storage tank (19) is also provided with a first fixing plate (17) and a second fixing plate (18), and the anode diaphragm (3), cathode diaphragm (5), anode plate (1) and cathode plate (7) are fixed in the reactor shell (16) via the first fixing plate (17) and the second fixing plate (18).

10. A method for removing scale-forming ions from water according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: The output water of the circulating water pool (9) enters the water storage tank (19) through the water inlet (8) of the water storage tank. The water level in the water storage tank (19) continues to rise and flows through the anode chamber water inlet (21), the deionized water chamber water inlet (22), and the cathode chamber water inlet (23) into the anode chamber (2), the deionized water chamber (4), and the cathode chamber (6) respectively. Step 2: After the DC power supply (20) is powered on, a water decomposition voltage is applied between the anode plate (1) and the cathode plate (7). Under the action of the electric field, the anode chamber (2) forms an acidic area, and the cathode chamber (6) forms an alkaline area. After the scale-forming ions in the water body reach saturation in the cathode chamber, they precipitate on the cathode diaphragm (5) and the cathode plate (7) to form scale. The water body treated by the cathode chamber flows into the cathode water tank (11) through the cathode chamber water outlet (15). The water mixed with the precipitate can be precipitated in the cathode water tank (11) to obtain an aqueous solution that flows into the circulating water tank (9) and continues to be put into use. The water outlet of the anode chamber (2) flows into the anode water tank (12) through the anode chamber water outlet (13). The water outlet of the deionized water chamber (4) flows into the deionized water tank (11) through the deionized water chamber water outlet (14). The aqueous solutions of the anode water tank (12) and the deionized water tank (11) flow into the circulating water tank (9) and continue to circulate to the water storage tank (19); Step 3: After reaching the preset cycle, the cathode diaphragm (5) and the cathode plate (7) with scale attached to the surface are cleaned and then continued to be used.

Images