System and method for preparing pulse electrochemical water purifying agent based on high-salinity water and product

Abstract

The invention discloses a pulse electrochemical water purifying agent preparation system based on high salinity water. The pulse electrochemical water purifying agent preparation system comprises a pretreatment system, an electrolysis system, an aeration system, a dynamic circulation system, a monitoring system and a collection system, the pretreatment system, the aeration system, the dynamic circulation system, the monitoring system and the collection system are respectively connected with the electrolysis system; the pretreatment system comprises an adjusting tank, a sedimentation tank, a precision filter, a pretreatment security filter and an ion adjusting tank which are connected in sequence, and the ion adjusting tank is connected with the electrolysis system. The preparation method comprises the following steps: S1, high-salt water pretreatment; S2, system starting; S3, pulse electrolysis; S4, reaction ending; the invention also discloses a product obtained by using the preparation method. The method can solve the problems of anode passivation and high energy consumption of a traditional direct-current electrochemical method, realizes resource utilization of the heavy salt water, does not need to add an oxidizing agent, and is suitable for large-scale continuous production.

Description

Technical Field

[0001] This invention relates to the field of water treatment formulation technology, and in particular to a pulse electrochemical water purification agent preparation system, method and product based on high saline water. Background Technology

[0002] High-efficiency water purification agents are inorganic polymeric water purification agents. Traditional preparation technologies have significant drawbacks. Chemical oxidation methods rely on oxidants and cause significant pollution. Meanwhile, industries such as chemical processing, dyeing and printing, and seawater desalination generate large amounts of high-salinity water with a salt content of 5%-20%. Direct discharge of such water can easily lead to soil salinization and eutrophication of water bodies. Traditional high-salinity water treatment methods, such as evaporation and crystallization, are energy-intensive and costly, making them difficult to apply on a large scale.

[0003] Existing electrochemical technologies do not cover the resource utilization of high-salinity water, and high-salinity water contains Ca. 2+ Mg 2+ SiO3 2- Impurities such as scale and corrosion on electrodes can easily lead to scale buildup and corrosion, affecting electrolysis efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a pulsed electrochemical water purification agent preparation system, method, and product based on high saline water, so as to solve the technical problems mentioned in the background art. To achieve the above objectives, the present invention adopts the following technical solution: A pulsed electrochemical water purification agent preparation system based on high saline water includes a pretreatment system, an electrolysis system, an aeration system, a dynamic circulation system, a monitoring system, and a collection system. The pretreatment system, aeration system, dynamic circulation system, monitoring system, and collection system are all connected to the electrolysis system. The pretreatment system includes an equalization tank, a sedimentation tank, a precision filter, a pretreatment security filter, and an ion equalization tank connected in sequence, with the ion equalization tank connected to the electrolysis system. The precision filter has a filtration accuracy of 1 μm, and the security filter has a filtration accuracy of 0.5 μm.

[0005] Furthermore, the electrolysis system includes an electrolytic cell, an anode electrode, a cathode electrode, and a power supply; the electrolytic cell is a diaphragm-free electrolytic cell made of polypropylene homopolymer (PPH) resistant to high-salt chemical corrosion, with dimensions of 1000mm (length) × 500mm (width) × 800mm (height); the anode electrode and cathode electrode are alternately connected and arranged inside the electrolytic cell; the power supply is electrically connected to the anode electrode and cathode electrode at both ends.

[0006] Furthermore, the anode electrode is a porous iron-based anode plate, which is made by mixing, pressing, and sintering industrial pure iron powder, a pore-forming agent, and a binder, and then coating the surface with a salt corrosion resistant coating; the pressing conditions are 15-20 MPa, the sintering temperature is 800-850℃, and the sintering time is 2 hours; the purity of the industrial pure iron powder is ≥99.5%, the pore-forming agent is ammonium bicarbonate or polymethyl methacrylate, the binder is polyvinyl alcohol, and the salt corrosion resistant coating material is 0.01%-0.02% of silane coupling agent KH-550; the porous iron-based anode plate has a pore diameter of 2-5 mm and a porosity of 30%-50%; the cathode electrode is a pure titanium cathode plate; the surface area ratio of the cathode electrode to the anode electrode is 1.2-1.5:1; the power supply is a pulse power supply, which can output square wave, sawtooth wave, or sine wave pulses.

[0007] Furthermore, the aeration system includes an air compressor and an aeration pipe; one end of the aeration pipe is connected to the air compressor, and the other end is located inside the electrolytic cell; the aeration rate of the aeration system is 0.05-0.2 L / (min). L solution).

[0008] Furthermore, the dynamic circulation system includes a dynamic circulation pump, a heat exchanger, and a circulation security filter connected in sequence, wherein the dynamic circulation pump is connected to the electrolytic cell, and the circulation security filter is connected to the electrolytic cell to form a circulation; the filtration accuracy of the circulation security filter is 0.5μm.

[0009] Furthermore, the collection system includes a collection tank; the collection tank is connected to the electrolytic cell.

[0010] Furthermore, it also includes an electrolyte circulation pump; the electrolyte circulation pump is connected to the collection tank and the equalization tank respectively.

[0011] Furthermore, the monitoring system includes a pH sensor, an ORP sensor, and a Fe sensor. 2+ Concentration detector, conductivity meter; pH sensor, ORP sensor, Fe 2+ The concentration meter and conductivity meter are both connected to the electrolytic cell to monitor pH, ORP, and Fe. 2+ Concentration, conductivity.

[0012] A method for preparing a pulsed electrochemical water purification agent based on high salinity includes the following steps: S1 High-Salinity Pretreatment: The raw high-salinity water is introduced into the equalization tank of the pretreatment system. A mixture of sodium carbonate and sodium hydroxide is added to the equalization tank to adjust the pH to between 6.0 and 10.0. After stirring for 30 minutes, the water is introduced into the sedimentation tank. Polyacrylamide is added to the sedimentation tank to remove Ca²⁺. + Mg² +Precipitation removal: If heavy metals are present, sodium sulfide is added to form sulfide precipitate to avoid excessive consumption of subsequent impurity removal agents. After precipitation of the original high-salt water, the supernatant is sequentially filtered through a precision filter and a security filter to remove suspended solids and obtain filtrate. The filtrate enters an ion conditioning tank to control the mass concentration of salt in the filtrate to 5%-15% and pH≤3 to obtain refined high-salt electrolyte. S2 System Start-up: The refined high-salt electrolyte is fed into the electrolytic cell of the electrolysis system. The monitoring system monitors the parameters in real time and calibrates the initial parameters of the refined high-salt electrolyte to ensure that the conductivity is ≥30mS / cm and the pH is ≤3. The aeration system and dynamic circulation system are started. The air compressor of the aeration system introduces gas into the aeration pipe and aerates the electrolyte through the aeration pipe. The dynamic circulation pump of the dynamic circulation system pumps the refined high-salt electrolyte into the heat exchanger. After heat exchange in the heat exchanger, the electrolyte is sent to the circulating security filter for filtration and then returned to the electrolytic cell for circulation. S3 Pulse Electrolysis: Start the pulse power supply to perform multi-stage electrolysis; S4 reaction complete: When the monitoring system detects Fe²⁺ in the refined high-salt electrolyte in the electrolyzer... + When the concentration of iron is ≤10% of the total iron content and the total iron content is ≥10%, the reaction is stopped and the reaction solution is obtained. S5 Product Collection: The reaction solution is sent into the collection tank and left to stand for 2 hours to allow the residual salt in the reaction solution to precipitate. Then, the supernatant in the reaction solution is extracted, filtered, and trace amounts of iron slag are removed to obtain a high-efficiency water purification agent product. S6 Residual Electrolyte Circulation: The salt-containing reaction solution in the lower layer of the collection tank is pumped into the conditioning tank through the electrolyte circulation pump, and mixed with the original high-salt water for the next reaction for circulation.

[0013] Furthermore, in step S3, the multi-stage electrolysis includes: Phase 1: Pulse frequency 800-1500Hz, duty cycle 40%-50%, average current density 20-30mA / cm² 2 The circulation rate is 1.0-1.2 m / s. 3 / h, runs for 2~3 hours; Phase Two: Switching frequency of 2000-3000Hz, duty cycle of 10%-30%, average current density of 5-15mA / cm² 2 The circulation rate is 0.6-0.8 m / s. 3 / h, runs for 2~3 hours.

[0014] The advantages of this invention compared to the prior art are as follows: 1. This invention solves the problems of high energy consumption and anode passivation in traditional DC electrochemical methods, and also realizes the resource utilization of high-salinity water without the need for external oxidants. The total iron content of the product reaches over 10%, and the Fe content is high. 2+With a residual rate of less than 8%, energy consumption is significantly reduced compared to the traditional DC method, and the utilization rate of high saline solution is ≥95%, making it suitable for large-scale continuous production.

[0015] 2. This invention employs a synergistic design of high-salt water pretreatment for impurity removal, corrosion-resistant porous anodes, pulsed electric field-induced passivation suppression, and electrocatalytic oxidation. The high-salt water, after pretreatment to remove impurities, serves as the electrolyte, providing the necessary ions for electrolysis to reduce energy consumption and achieving resource utilization. The combination of corrosion-resistant anodes and pulsed electric fields solves the problems of electrode corrosion and passivation in high-salt environments. Electrocatalytic oxidation replaces chemical oxidants, reducing pollution. The recycling of the electrolyte further improves the utilization rate of high-salt water, transforming high-salt wastewater into electrolyte for the preparation of high-efficiency water purification products. This recycling process, which also recycles the remaining electrolyte, reduces the cost of high-salt water treatment, achieving waste-to-waste treatment and the reuse of waste resources.

[0016] 3. This invention employs a two-stage pulse electrolysis process. The first stage utilizes a high duty cycle to continuously drive the electrolysis reaction, and combined with a porous iron-based anode with high porosity, it can rapidly obtain a high concentration of iron ions. The second stage increases the pulse frequency to prevent electrode corrosion and passivation. Simultaneously, the lower duty cycle and current density promote the preservation of Fe... 2+ The electrodes are fully oxidized, thereby achieving high efficiency in resource utilization, extending electrode lifespan, and producing high-performance water purification products. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the preparation system of the present invention; In the attached diagram, 11-Equalization tank; 12-Sedimentation tank; 13-Precision filter; 14-Pre-treatment security filter; 15-Ion equalization tank; 21-Electrolytic cell; 22-Anode electrode; 23-Cathode electrode; 24-Power supply; 31-Air compressor; 32-Aeration pipe; 41-Dynamic circulating pump; 42-Heat exchanger; 43-Circulating security filter; 51-pH sensor; 52-ORP sensor; 53-Fe 2+ Concentration detector; 54-Conductivity meter; 61-Collection tank; 71-Electrolyte circulation pump. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the invention, and these aspects of the invention can be achieved even without these specific details.

[0019] Example 1 like Figure 1 As shown, a pulsed electrochemical water purification agent preparation system, method, and product based on high saline water includes a pretreatment system, an electrolysis system, an aeration system, a dynamic circulation system, a monitoring system, and a collection system. The pretreatment system, aeration system, dynamic circulation system, monitoring system, and collection system are respectively connected to the electrolysis system. The pretreatment system includes an equalization tank 11, a sedimentation tank 12, a precision filter 13, a pretreatment security filter 14, and an ion equalization tank 15 connected in sequence, and the ion equalization tank 15 is connected to the electrolysis system.

[0020] The electrolysis system includes an electrolytic cell 21, an anode electrode 22, a cathode electrode 23, and a power supply 24. The anode electrode 22 and the cathode electrode 23 are alternately connected and disposed in the electrolytic cell 21. The anode electrode 22 is a porous iron-based anode plate with a salt corrosion resistant coating on its surface. The cathode electrode 23 is a pure titanium cathode plate. The power supply 24 is electrically connected to the anode electrode 22 and the cathode electrode 23 at both ends. The power supply 24 is a pulse power supply 24.

[0021] The porous iron-based anode plate is made by mixing, pressing, and sintering industrial pure iron powder, ammonium bicarbonate pore-forming agent, and polyvinyl alcohol binder. The surface is coated with a 0.01% silane coupling agent KH-550 salt corrosion resistant coating. The pressing pressure is 15 MPa, the sintering temperature is 800℃, the sintering time is 2 h, the pore diameter is 2 mm, and the porosity is 30%. The surface area ratio of the cathode electrode 23 to the anode electrode 22 is 1.2:1.

[0022] The aeration system includes an air compressor 31 and an aeration pipe 32; one end of the aeration pipe 32 is connected to the air compressor 31, and the other end is located at the bottom of the electrolytic cell 21.

[0023] The dynamic circulation system includes a dynamic circulation pump 41, a heat exchanger 42, and a circulation security filter 43 connected in sequence. The dynamic circulation pump 41 is connected to the electrolytic cell 21, and the circulation security filter 43 is connected to the electrolytic cell 21 to form a circulation.

[0024] The collection system includes a collection tank 61; the collection tank 61 is connected to the electrolytic cell 21.

[0025] It also includes an electrolyte circulation pump 71; the electrolyte circulation pump 71 is connected to the collection tank 61 and the regulating tank 11 respectively.

[0026] The monitoring system includes a pH sensor 51, an ORP sensor, and a Fe sensor. 2+ Concentration detector 53, conductivity meter 54; pH sensor 51, ORP sensor, Fe 2+ The concentration detector 53 and the conductivity meter 54 are both connected to the electrolytic cell 21.

[0027] The original high-salinity water in this embodiment comes from the desalination concentrate of wastewater from a chemical plant. The high-salinity water contains Cl... - Concentration of 5.2%, SO4 2- Concentration of 2.1%, Ca 2+ Concentration of 0.3%, Mg 2+ The concentration was 0.2%, and the suspended solids were 15 mg / L.

[0028] The method of using the dynamic pulse electrochemical high-efficiency water purification agent preparation system based on high saline electrolyte includes the following steps: S1 High-Salinity Pretreatment: The raw high-salinity water is introduced into the equalization tank 11 of the pretreatment system. A mixture of sodium carbonate and sodium hydroxide is added to the equalization tank 11 to adjust the pH to between 6.0 and 10.0. After stirring for 30 minutes, the water is introduced into the sedimentation tank 12. Polyacrylamide is added to the sedimentation tank 12 to remove calcium... 2+ Mg 2+ Precipitation removal: After allowing the original high-salt water to settle for 2.5 hours, the Ca in the supernatant was removed. 2+ + Mg 2+ The concentration of salt in the supernatant is ≤0.05%. Then, the supernatant enters the precision filter 13 and the security filter in sequence for filtration to remove suspended solids and obtain the filtrate. The filtrate enters the ion conditioning tank 15 to add hydrochloric acid and sodium chloride, and controls the mass concentration of salt in the filtrate to 5% and pH ≤3 to obtain a refined high-salt electrolyte with suspended solids ≤10mg / L and conductivity ≥30mS / cm. S2 System Startup: The refined high-salt electrolyte is fed into the electrolysis cell 21 of the electrolysis system. The monitoring system monitors parameters in real time and calibrates the initial parameters of the refined high-salt electrolyte to ensure conductivity ≥30 mS / cm and pH ≤3. The aeration system and dynamic circulation system are started. The air compressor 31 of the aeration system introduces gas into the aeration pipe 32, and aeration occurs through the aeration pipe 32 at a rate of 0.05 L / (min). L solution), the dynamic circulation pump 41 of the dynamic circulation system pumps the refined high saline electrolyte into the heat exchanger 42. After heat exchange in the heat exchanger 42, it is sent to the circulation security filter 43 for filtration, and then returned to the electrolytic cell 21 for circulation. S3 Pulse Electrolysis: Start pulse power supply 24 to perform multi-stage electrolysis: Phase 1: Pulse frequency 1500Hz, duty cycle 50%, average current density 30mA / cm² 2 Circulation rate 1.2m 3 / h, runs for 3 hours; Phase Two: Switching frequency 3000Hz, duty cycle 30%, average current density 15mA / cm² 2 Circulation rate 0.8m 3 / h, runs for 3 hours; During the electrolysis process, when the ORP sensor 52 of the monitoring system detects that the ORP is lower than 400mV, the aeration rate is increased to make the ORP higher than 400mV. S4 reaction complete: When the monitoring system detects Fe in the refined high-salt electrolyte in electrolytic cell 21... 2+ When the concentration of iron is ≤10% of the total iron content and the total iron content is ≥10%, the reaction is stopped and the reaction solution is obtained. S5 Product Collection: The reaction solution was transferred to collection tank 61 and allowed to stand for 2 hours to precipitate the residual salts. The supernatant was then extracted and filtered through a 0.5μm security filter to remove trace amounts of iron slag, yielding a product with a total iron content of 11.5% and Fe. 2+ The residual reddish-brown liquid high-efficiency water purification agent, at 8%, was used to prepare porous iron-based anode plates after the iron slag was cleaned and dried. S6 Residual Electrolyte Circulation: The salt-containing reaction liquid in the lower layer of the collection tank 61 is pumped into the regulating tank 11 through the electrolyte circulation pump 71, and mixed with the original high-salt water for the next reaction for circulation, with a total utilization rate of 95.9%.

[0029] Example 2 The pulse electrochemical water purification agent preparation system based on high saline water is basically the same as that in Example 1, except that: the porous iron-based anode plate is made by mixing, pressing, and sintering industrial pure iron powder, ammonium bicarbonate pore-forming agent, and polyvinyl alcohol binder, and the surface is coated with 0.01% silane coupling agent KH-550 salt corrosion resistant coating; the pressing conditions are 15MPa, sintering temperature is 800℃, sintering time is 2h, pore diameter is 3.5mm, and porosity is 45%; the surface area ratio of cathode electrode 23 to anode electrode 22 is 1.35:1.

[0030] The original high-salinity water in this embodiment comes from high-salinity wastewater from a leather manufacturing company. This high-salinity water contains 10% salt and Cl... - Concentration of 4.0%, Ca 2+ Concentration of 0.5%, Mg 2+ The concentration was 0.3%, and the suspended solids were 20 mg / L.

[0031] A method for preparing a pulsed electrochemical water purification agent based on high salinity includes the following steps: S1 High-Salinity Pretreatment: The raw high-salinity water is introduced into the equalization tank 11 of the pretreatment system. A mixture of sodium carbonate and sodium hydroxide is added to the equalization tank 11 to adjust the pH to between 6.0 and 10.0. After stirring for 40 minutes, the water is introduced into the sedimentation tank 12. Polyacrylamide is added to the sedimentation tank 12 to remove calcium... 2+ Mg 2+ Precipitation removal: After allowing the original high-salt water to settle for 2.5 hours, the Ca in the supernatant was removed. 2+ +Mg 2+ The salt concentration is ≤0.05%. Then, the supernatant enters the precision filter 13 and the security filter in sequence for filtration to remove suspended solids and obtain filtrate. The filtrate enters the ion conditioning tank 15 to add hydrochloric acid and sodium chloride, and controls the mass concentration of salt in the filtrate to 10% and pH ≤3, to obtain a refined high-salt electrolyte with a conductivity ≥30mS / cm. S2 System Startup: The refined high-salt electrolyte is fed into the electrolysis cell 21 of the electrolysis system. The monitoring system monitors parameters in real time and calibrates the initial parameters of the refined high-salt electrolyte to ensure conductivity ≥30 mS / cm and pH ≤3. The aeration system and dynamic circulation system are started. The air compressor 31 of the aeration system introduces gas into the aeration pipe 32, and aeration occurs through the aeration pipe 32 at a rate of 0.12 L / (min). L solution), the dynamic circulation pump 41 of the dynamic circulation system pumps the refined high saline electrolyte into the heat exchanger 42, and after heat exchange in the heat exchanger 42, it is sent to the circulation security filter 43 for filtration, and then returned to the electrolytic cell 21 for circulation. S3 Pulse Electrolysis: Start pulse power supply 24 to perform multi-stage electrolysis: Phase 1: Pulse frequency 1150Hz, duty cycle 45%, average current density 25mA / cm² 2 Circulation rate 1.1m 3 / h, runs for 3 hours; Phase Two: Switching frequency of 2500Hz, duty cycle of 20%, average current density of 10mA / cm² 2 Circulation rate 0.7m 3 / h, runs for 3 hours; During the electrolysis process, when the ORP sensor 52 of the monitoring system detects that the ORP is lower than 400mV, the aeration rate is increased to make the ORP higher than 400mV. S4 reaction complete: When the monitoring system detects Fe in the refined high-salt electrolyte in electrolytic cell 21... 2+ When the concentration of iron is ≤10% of the total iron content and the total iron content is ≥10%, the reaction is stopped and the reaction solution is obtained. S5 Product Collection: The reaction solution was sent to collection tank 61 and allowed to stand for 2 hours to precipitate the residual salts. The supernatant was then extracted and filtered through a 0.5μm security filter to remove trace amounts of iron slag, yielding a product with a total iron content of 11.3% and Fe... 2+ The residual reddish-brown liquid high-efficiency water purification agent at 6% was used to prepare porous iron-based anode plates after the iron slag was cleaned and dried. S6 Residual Electrolyte Circulation: The salt-containing reaction liquid in the lower layer of the collection tank 61 is pumped into the regulating tank 11 through the electrolyte circulation pump 71, and mixed with the original high-salt water for the next reaction for circulation, with a total utilization rate of 96.3%.

[0032] Example 3 The pulse electrochemical water purification agent preparation system based on high saline water is basically the same as that in Example 1, except that: the porous iron-based anode plate is made by mixing, pressing, and sintering industrial pure iron powder, polymethyl methacrylate pore-forming agent, and polyvinyl alcohol binder, and the surface is coated with 0.02% silane coupling agent KH-550 salt corrosion resistant coating; the pressing conditions are 20MPa, sintering temperature is 850℃, sintering time is 2h, pore diameter is 5mm, and porosity is 50%; the surface area ratio of cathode electrode 23 to anode electrode 22 is 1.5:1.

[0033] The original high-salinity water in this embodiment comes from the concentrated water after seawater desalination. The high-salinity water contains Cl... - Concentration of 9.2%, SO4 2- Concentration of 1.2%, Ca 2+ Concentration of 0.2%, Mg 2+ The concentration is 0.6%.

[0034] A method for preparing a pulsed electrochemical water purification agent based on high salinity includes the following steps: S1 High-Salinity Pretreatment: The raw high-salinity water is introduced into the equalization tank 11 of the pretreatment system. A mixture of sodium carbonate and sodium hydroxide is added to the equalization tank 11 to adjust the pH to between 6.0 and 10.0. After stirring for 45 minutes, the water is introduced into the sedimentation tank 12. Polyacrylamide is added to the sedimentation tank 12 to remove calcium... 2+ Mg 2+ Precipitation removal: After the original high-salt water was allowed to settle for 3 hours, the Ca in the supernatant was... 2+ + Mg 2+ The salt concentration is ≤0.05%. Then, the supernatant enters the precision filter 13 and the security filter in sequence for filtration to remove suspended solids and obtain filtrate. The filtrate enters the ion conditioning tank 15 and is supplemented with hydrochloric acid, sodium chloride, sodium sulfate and sodium hydroxide to control the mass concentration of salt in the filtrate to 15% and pH≤3, so as to obtain a refined high-salt electrolyte with conductivity ≥30mS / cm. S2 System Startup: The refined high-salt electrolyte is fed into the electrolysis cell 21 of the electrolysis system. The monitoring system monitors parameters in real time and calibrates the initial parameters of the refined high-salt electrolyte to ensure conductivity ≥50 mS / cm and pH ≤3. The aeration system and dynamic circulation system are started. The air compressor 31 of the aeration system introduces gas into the aeration pipe 32, and aeration occurs through the aeration pipe 32 at a rate of 0.2 L / (min). L solution), the dynamic circulation pump 41 of the dynamic circulation system pumps the refined high saline electrolyte into the heat exchanger 42, and after heat exchange in the heat exchanger 42, it is sent to the circulation security filter 43 for filtration, and then returned to the electrolytic cell 21 for circulation. S3 Pulse Electrolysis: Start pulse power supply 24 to perform multi-stage electrolysis: Phase 1: Pulse frequency 800Hz, duty cycle 40%, average current density 20mA / cm² 2 Circulation rate 1.0m 3 / h, runs for 2 hours; Phase Two: Switching frequency of 2000Hz, duty cycle of 10%, average current density of 5mA / cm² 2 Circulation rate 0.6m 3 / h, runs for 3 hours; During the electrolysis process, when the ORP sensor 52 of the monitoring system detects that the ORP is lower than 400mV, the aeration rate is increased to make the ORP higher than 400mV. S4 reaction complete: When the monitoring system detects Fe in the refined high-salt electrolyte in electrolytic cell 21... 2+ When the concentration of iron is ≤10% of the total iron content and the total iron content is ≥10%, the reaction is stopped and the reaction solution is obtained. S5 Product Collection: The reaction solution is sent to collection tank 61 and allowed to stand for 2 hours to allow residual salts to precipitate. The supernatant is then extracted, filtered, and trace amounts of iron slag are removed, yielding a product with a total iron content of 11.3% and Fe. 2+ The high-efficiency water purification agent with a residue of 9% was used to prepare porous iron-based anode plates after the iron slag was cleaned and dried. S6 Residual Electrolyte Circulation: The salt-containing reaction liquid in the lower layer of the collection tank 61 is pumped into the regulating tank 11 through the electrolyte circulation pump 71, and mixed with the original high-salt water for the next reaction for circulation, with a total utilization rate of 95.7%.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pulsed electrochemical water purification agent preparation system based on high saline water, comprising a pretreatment system, an electrolysis system, an aeration system, a dynamic circulation system, a monitoring system, and a collection system, characterized in that: The pretreatment system, aeration system, dynamic circulation system, monitoring system, and collection system are respectively connected to the electrolysis system; the pretreatment system includes an equalization tank, a sedimentation tank, a precision filter, a pretreatment security filter, and an ion equalization tank connected in sequence, and the ion equalization tank is connected to the electrolysis system.

2. The pulsed electrochemical water purification agent preparation system based on high saline water according to claim 1, characterized in that: The electrolysis system includes an electrolytic cell, an anode electrode, a cathode electrode, and a power supply. The anode and cathode electrodes are alternately connected within the electrolytic cell, with a surface area ratio of 1.2-1.5:

1. The anode electrode is a porous iron-based anode plate coated with a salt corrosion resistant coating. The cathode electrode is a pure titanium cathode plate. The power supply is electrically connected to both the anode and cathode electrodes at both ends. The power supply is a pulse power supply.

3. The pulsed electrochemical water purification agent preparation system based on high saline water according to claim 1, characterized in that: The aeration system includes an air compressor and an aeration pipe; one end of the aeration pipe is connected to the air compressor, and the other end is located in the electrolytic cell.

4. The pulsed electrochemical water purification agent preparation system based on high saline water according to claim 1, characterized in that: The dynamic circulation system includes a dynamic circulation pump, a heat exchanger, and a circulation security filter connected in sequence. The dynamic circulation pump is connected to the electrolytic cell, and the circulation security filter is connected to the electrolytic cell to form a circulation.

5. The pulsed electrochemical water purification agent preparation system based on high saline water according to claim 1, characterized in that: The collection system includes a collection tank; the collection tank is connected to an electrolytic cell.

6. The pulsed electrochemical water purification agent preparation system based on high saline water according to claim 1, characterized in that: It also includes an electrolyte circulation pump; the electrolyte circulation pump is connected to the collection tank and the equalization tank respectively.

7. The pulsed electrochemical water purification agent preparation system based on high saline water according to claim 1, characterized in that: The monitoring system includes a pH sensor, an ORP sensor, and a Fe²⁺ sensor. + Concentration detector, conductivity meter; pH sensor, ORP sensor, Fe² + The concentration detector and conductivity meter are both connected to the electrolytic cell.

8. A method for preparing a pulsed electrochemical water purifier based on high saline water, utilizing the preparation system as described in any one of claims 1-7, characterized in that, Includes the following steps: S1 High-Salinity Pretreatment: The raw high-salinity water is introduced into the equalization tank of the pretreatment system, and the pH is adjusted to between 6.0 and 10.

0. After stirring for 30-45 minutes, it is introduced into the sedimentation tank. Polyacrylamide is added to the sedimentation tank to remove Ca²⁺. + Mg² + After precipitation removal, the supernatant is allowed to stand for 2-3 hours for sedimentation. Then, the supernatant is filtered through a precision filter and a security filter to remove suspended solids and obtain filtrate. The filtrate is then fed into an ion conditioning tank to control the mass concentration of salt in the filtrate to 5%-15% and pH≤3 to obtain refined high-salt electrolyte. S2 System Start-up: The refined high-salt electrolyte is fed into the electrolysis cell of the electrolysis system. The monitoring system monitors the parameters in real time and calibrates the initial parameters of the refined high-salt electrolyte. The aeration system and dynamic circulation system are started. The air compressor of the aeration system introduces gas into the aeration pipe and aerates through the aeration pipe. The dynamic circulation pump of the dynamic circulation system pumps the refined high-salt electrolyte into the heat exchanger. After heat exchange in the heat exchanger, it is sent to the circulating security filter for filtration and then returned to the electrolysis cell for circulation. S3 Pulse Electrolysis: Start the pulse power supply to perform multi-stage electrolysis; S4 reaction complete: When the monitoring system detects Fe²⁺ in the refined high-salt electrolyte in the electrolyzer... + When the concentration of iron is ≤10% of the total iron content and the total iron content is ≥10%, the reaction is stopped and the reaction solution is obtained. S5 Product Collection: The reaction solution is sent into the collection tank and left to stand to allow the residual salt in the reaction solution to precipitate. Then, the supernatant in the reaction solution is extracted, filtered, and trace amounts of iron slag are removed to obtain a high-efficiency water purification agent product. S6 Residual Electrolyte Circulation: The salt-containing reaction solution in the lower layer of the collection tank is pumped into the conditioning tank through the electrolyte circulation pump, and mixed with the original high-salt water for the next reaction to carry out the next cycle reaction.

9. The pulse electrochemical water purification agent preparation system, method, and product based on high saline water as described in claim 8, characterized in that: In step S3, the multi-stage electrolysis includes: Phase 1: Pulse frequency 800-1500Hz, duty cycle 40%-50%, average current density 20-30mA / cm² 2 The circulation rate is 1.0-1.2 m / s. 3 / h, running for 2~3 hours; Phase Two: Switching frequency of 2000-3000Hz, duty cycle of 10%-30%, average current density of 5-15mA / cm² 2 The circulation rate is 0.6-0.8 m / s. 3 / h, runs for 2~3 hours.

10. A water purification agent obtained by the preparation method according to claim 8.

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