Water treatment method and system using electric field oxidation electrocoagulation and conventional magnetic separation

Abstract

The present application belongs to the technical field of water treatment, and discloses a water treatment method and system adopting unidirectional pulse high-voltage electric field discharge oxidation, alternating current electric field fixed spiral wing fin static disturbance electric field microflocculation, conventional magnetic field separation, and anaerobic reduction reaction. A pressurizing water pump is installed in series at the outlet of a water source, and the treated water enters the unidirectional pulse high-voltage electric field discharge oxidation device, the alternating current electric field fixed spiral wing fin static disturbance microflocculation device, and the magnetic separation device in sequence through pressurization, and then enters the conical bottom anaerobic reduction reaction water tank, and is supplied to the user after pressurization by the outlet pressurizing pump; when the magnetic separation device is saturated, the backwashing process is started, the backwashing adopts steam-water backwashing, the backwashing sewage enters the conical bottom anaerobic reduction reaction water tank, a backflow submersible metering pump is arranged at the upper half of the water tank, the outlet of the metering pump is connected to the water inlet of the unidirectional pulse high-voltage electric field discharge oxidation device and is provided with an electromagnetic valve, and is used for strengthening the oxidation microflocculation again, thereby saving the cost of the traditional process by 50-80%.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, and particularly relates to a water treatment method and system that employs electric field oxidation micro-flocculation, magnetic field separation, and anaerobic reduction coagulant. Background Technology

[0002] Currently, coagulation, oxidation, and filtration are the most commonly used technologies in water treatment processes. Taking groundwater iron and manganese removal as an example, contact oxidation or aeration oxidation techniques are often used to remove iron and manganese from water. This oxidizes ferrous ions to ferric ions, which then form an iron gel and undergo flocculation during oxidation, followed by filtration. Contact oxidation methods often employ the addition of potassium permanganate or manganese sand for catalysis or biological oxidation. However, potassium permanganate oxidation increases the presence of chemicals in the water, manganese sand catalysis requires a large area, and the manganese sand needs to be replaced. Biological oxidation has a long treatment cycle, requires a large area, and causes significant air pollution.

[0003] Another type of aeration oxidation method commonly uses cascading aeration, forced-air aeration, and high-concentration ozone aeration oxidation technology. The oxidation technologies described above require large equipment footprints, consume a lot of power, generate high noise levels, cause severe corrosion, cause significant environmental pollution, have low oxidation efficiency, and require high infrastructure investment. Not only do they require massive buildings, but they also necessitate waterproofing, insulation, corrosion resistance, and infrastructure maintenance.

[0004] The oxidation methods described above have poor oxidation capacity. According to engineering practice statistics, the dissolved oxygen in the treated water only increases to 2-4 mg / L when using the cascading aeration process.

[0005] Numerous engineering case studies have demonstrated that water treatment systems using filter materials such as manganese sand and quartz sand suffer from low flow rates, large backwash volumes, large footprints, high operating costs, and require filter media replacement every two to three years. These systems are not only difficult to manage and labor-intensive, but also wasteful of resources. Therefore, there is an urgent need to design a new water treatment method.

[0006] For example, groundwater may contain high levels of iron and manganese, and have high hardness. To remove these excessive substances, the iron in the water needs to be oxidized first. Only when ferrous ions are oxidized will micro-flocculation form, allowing filtration technology to remove the iron from the water. The oxidation reaction equation for ferrous iron is as follows: ferrous ions in the water are oxidized to iron with trivalent or higher valence bonds.

[0007] In an acidic environment: 4Fe 2+ +O2+4H+=4Fe 3+ +2H2O;

[0008] In neutral or alkaline environments: 12Fe 2+ +3O 2 +6H₂O=8Fe 3++4Fe(OH) 3 .

[0009] From the above chemical equation, it can be seen that Fe 2+ To Fe 3+ The valence bond increases, which is essentially iron gaining a positive charge.

[0010] Imagine placing the water to be oxidized in a high-voltage electrostatic field with a positive anodic potential. With continuous discharge from this positive high-voltage field, ferrous ions will be oxidized to higher valence ions. Of course, this requires designing the positive potential to be higher than or slightly higher than the second ionization energy of iron.

[0011] As is well known, the second ionization energy of iron is 1561.9 kJ·mol⁻¹. -1 Based on a national drinking water standard of 0.3 mg / L, calculated at 10 times the standard, the second ionization energy required for each ton of water is 83.7 * 10^6 mg / L. 6 kJ ionization energy. If the energy of the electric field slightly exceeds this value, under ideal conditions, the ferrous ions in 1 ton of water will be oxidized to ferric ions in 1 second.

[0012] According to Joule's law, if the current is 1A and the resistance between the electrodes is 1k ohms, it can oxidize 43 tons of water containing 3mg of ferrous ions in 1 hour.

[0013] 1000 kilowatt-hours of electricity equals: 3.6 × 10 6 KJ, 1 ton of water containing 3mg / l of iron requires 23.25.

[0014] Fe under acidic conditions 2+ Oxidized to Fe 3+ Fe(OH)3 is generated under alkaline conditions.

[0015] Acidic ionic equation: 4Fe 2+ +4H + +O2=4Fe 3+ +2H2O;

[0016] Ionic equation for alkaline conditions: 1 / 2 Fe 2+ +3O₂ + 6H₂O = 8Fe 3+ +4Fe(OH) 3 .

[0017] Fe in the formula 3 It is magnetic and can be removed using magnetic separation technology;

[0018] In the formula, Fe(OH)3 is a colloid that can produce micro-flocculation.

[0019] The technology of oxidizing divalent iron ions to trivalent iron ions using a high-voltage field at the anode is called an electric field oxidation device. This technology has the advantages of small footprint, easy management, and low maintenance costs. Electric field oxidation not only improves the efficiency of water oxidation, but engineering experiments have also shown that it can significantly increase the oxidation intensity of ions in water.

[0020] Based on the above analysis, existing oxidation, coagulation, and filtration technologies have the following problems:

[0021] (1) In traditional water treatment processes, potassium permanganate oxidation increases the amount of chemical substances in the water, and manganese sand catalytic filtration has a filtration rate of only 6-7 m / h. It requires setting up an oxidation tank with a large footprint and replacing the manganese sand.

[0022] (2) In traditional water treatment processes, the aeration equipment of the aeration oxidation method has a large footprint, high power consumption, high noise, serious corrosion, serious environmental pollution, low oxidation efficiency, and high infrastructure investment. It not only requires a huge building, but also requires waterproofing, heat preservation, corrosion resistance, infrastructure maintenance, etc.

[0023] (3) Water treatment devices using traditional filter media have large backwash water volume, poor water quality, large footprint, high cost of frequent filter media replacement, are difficult to manage, have high labor intensity, waste resources and affect normal water supply.

[0024] (4) Existing aeration oxidation technologies have complex equipment structures, high engineering costs, environmental pollution, and difficult equipment maintenance. The aeration method has a poor ability to improve the dissolved oxygen of the treated water, and the conventional aeration process is not ideal in oxidizing ferrous ions in the water, resulting in incomplete oxidation.

[0025] (5) Traditional coagulation technology using aluminum salts causes aluminum content in water to soar, and excessive aluminum is the main culprit for Alzheimer's disease. Summary of the Invention

[0026] To address the problems existing in current water treatment oxidation, coagulation, filtration technologies and coagulant addition, this invention provides a water treatment method and system that employs electric field oxidation, electrocoagulation, conventional magnetic field filtration, and anaerobic reductive digestion. In particular, it relates to a water treatment technology and system that uses unidirectional high-frequency pulsed electric field oxidation + AC electric field fixed spiral fin electrocoagulation + conventional magnetic separation + backwashing anaerobic reductive reactor concentrate tank.

[0027] This invention is implemented as follows: a water treatment method and system employing electric field oxidation, electrocoagulation, conventional magnetic field separation, and anaerobic reductive digestion. The water treatment method employing electric field oxidation, electrocoagulation, magnetic field separation, and anaerobic reductive digestion includes:

[0028] A booster pump is installed at the outlet of the water source. The water to be treated first enters the electric field oxidation unit under pressure to oxidize ferrous ions into ferric ions, which have magnetic and coagulation functions. Then it enters the electrocoagulation unit and is coagulated into magnetic flocs by electric field interference and mechanical agitation. Then it enters the conventional magnetic field for magnetic separation to filter out the magnetic coagulated flocs. The filtered water enters the buffer tank and is then pressurized by the outlet booster pump before being supplied to users.

[0029] A backwash air pump and a water pump are connected to the magnetic separation outlet, and an anaerobic reduction backwash liquid concentration tank is connected to the magnetic separation inlet. After the magnetic separation unit has been working for a period of time and is approaching saturation, the backwashing process is activated to backwash the sludge trapped in the magnetic separation unit into the anaerobic reduction backwash liquid concentration tank. Due to the closed anaerobic design of the tank, the ferric ions in the tank are reduced to ferrous ions in the anaerobic environment and dissolved in the supernatant. This supernatant is then returned to the oxidation unit by a metering pump to mix with the treated water for further oxidation and coagulation. The concentration tank has a conical bottom design, allowing sludge to settle and concentrate, digesting it in an anaerobic environment. A very small amount of residue is returned to the field for soil improvement.

[0030] Furthermore, the water treatment system employing electric field oxidation, electrocoagulation, and magnetic field separation, as well as anaerobic reduction, includes the following steps:

[0031] Step one: Substances in the raw water that need to be oxidized are oxidized in the electric field oxidation unit. For example, ferrous ions are oxidized under the action of the high-voltage emission electrode at the anode of the insulating shell 1 to generate ferric ions, which have coagulation function and magnetism. After passing through the flexible connector, they enter the electrocoagulation insulating shell 2.

[0032] Step 2: When the water enters the electrocoagulation insulating shell 2, the water body is subjected to the combined effects of the agitation of the fixed spiral blades and the flocculation of the electrode electric field, which coagulates other impurities in the water into magnetic flocs.

[0033] Step 3: The magnetic flocs, after being treated by the electrocoagulation insulating shell 2, enter the magnetic separation unit. Under the action of the magnetic field, the magnetic flocs are captured, thereby achieving the function of separating impurities from the water and purifying the water quality.

[0034] Step four: After the magnetic separation unit has been working for a period of time and is nearing saturation, the backwashing process is initiated. During backwashing, the magnetic field power supply is first cut off. After the magnetic field is demagnetized, the coagulated particles trapped by the magnetic field are flushed into the anaerobic reduction backwash concentrate tank with steam and water. Since the backwash concentrate tank is a closed anaerobic system, anaerobic reactions can occur. The ferric ions in the flocs are reduced to ferrous ions through the anaerobic reaction and dissolved in the supernatant. Other pollutants in the flocs are digested through the anaerobic reaction, and the generated gas is emitted at high altitude, with a very small amount of residue returned to the field. The supernatant is returned to the electric field oxidation unit in the insulating shell 1 by a submersible metering pump, where it mixes with the treated water and can continue to enhance oxidation and electrocoagulation.

[0035] Another object of the present invention is to provide a water treatment method and system employing the aforementioned electric field oxidation, electrocoagulation, magnetic field separation, and anaerobic reduction system. This method and system can be used for removing fluoride from water, inactivating phytoplankton and certain bacteria, treating black and odorous water bodies, and for water treatment projects for special purposes. The water treatment system employing electric field oxidation, electrocoagulation, magnetic field separation, and anaerobic reduction includes a unidirectional pulse high-voltage electro-oxidation module, an electric pulse electric field coagulation module, a magnetic separation module, and a backwashing anaerobic reduction concentrated wastewater treatment module.

[0036] The unidirectional pulse high-voltage electro-oxidation and electro-pulse spiral micro-coagulation module includes an electronic oxidation unit and an electric field micro-coagulation unit; the magnetic separation module includes a shielded magnetic shell, an upper magnetic pole magnet, a lower magnetic pole magnet, an antimagnetic squirrel-cage cylinder (the antimagnetic cylinder can be made of PPR, copper alloy, iron alloy, etc.) and multiple sets of electromagnetic coils; the anaerobic reduction backwash wastewater anaerobic treatment module consists of a backwash air pump, a backwash water pump, a backwash wastewater anaerobic reduction reaction concentration tank, and solenoid valves.

[0037] Furthermore, the electric field oxidation unit is composed of a high-frequency function signal generator 10, a power signal amplifier 9, a unidirectional pulse high-voltage transmitter (voltage multiplier module) 10, an insulating shell 1, an inlet flange 2 of the insulating shell 1, an outlet flange 3 of the insulating shell 1, an oxide insulating block 4, an oxide graphite electrode 5, and an oxide strongly magnetic fiber metal wire 6.

[0038] The electro-coagulation unit consists of an insulating shell 12, a coagulation intermediate frequency function signal generator 20, a coagulation power signal amplifier 19, a pulsed dual-cathode high-voltage transmitter 18, an insulating shell 12, an inlet flange 13 of the insulating shell 2, an outlet flange 14 of the insulating shell 2, an electro-coagulation insulating block 1, micro-coagulation insulating blocks 21, 22, and 23, an electro-coagulation graphite cathode 24 and 25, an electro-coagulation anode 26, a spiral wing 15, and a flexible connector 11.

[0039] Furthermore, the electric field oxidation unit adopts a shell structure made of a material with insulating properties. A 5% mass / volume ratio of highly magnetically conductive fiber metal wire is filled inside the first insulating shell. A graphite electrode 5 is fixed at the upper end of the first shell, positioned in the center of the concentric circles of the insulating block 4. The outer end of the insulating shell 1 of the graphite electrode 5 is connected to the output terminal of the unidirectional pulse anode high-voltage generator 8, and the inner end of the insulating shell of the graphite electrode 5 is connected to the highly magnetically conductive fiber metal wire 6. The outlet flange 3 of the insulating shell 1 is connected to the inlet flange 13 of the insulating shell 2 via a flexible connecting pipe 11.

[0040] Furthermore, the unidirectional pulse anode high-voltage transmitter 8 uses a function signal generator 10 as the signal source, and then configures a conventional high-frequency power signal amplifier 9 to amplify the signal. After passing through the high-voltage pulse anode high-voltage generator 8, a unidirectional pulse high-voltage electromotive force of 20,000 to 30,000 volts is obtained through transformer and voltage multiplier module technology. Then, it discharges through the attraction effect of strong magnetic fiber, and the discharge current is less than 9 to 10 mA.

[0041] Furthermore, the electrocoagulation unit employs an insulating material for its shell structure. Three insulating blocks 21, 22, and 23 are installed at the upper end of the second shell. These insulating blocks are made of silicone rubber, serving both insulating and sealing functions, and also fixing the graphite electrodes 24, 25, and 26. The graphite electrode 26 is inserted into the center of the middle insulating block 22 as the anode, and its effective area is twice that of the cathodes 24 and 25. Graphite electrodes 24 and 26 are inserted into the middle of the front and rear insulating blocks as cathodes. The areas of the two graphite cathodes 24 and 26 are equal. Multiple spiral blades 15 are installed at the inner bottom of the insulating shell 2 to agitate and stir the water flow.

[0042] Furthermore, the shielded magnetic cage shell 33 of the magnetic field separation unit uses multiple rectangular magnetic ribs made of pure iron to form a cylindrical shape, with upper and lower cover plates 28 connected by screws, forming the outermost layer of the magnet; an antimagnetic cylinder 29 is set at the concentric center of the upper and lower magnetic poles 31 magnet shells, and the cylinder can be made of PPR, copper alloy, or other antimagnetic metal materials. The cylinder is filled with 5% by mass / volume of strong magnetic fiber metal wire 30; multiple sets of electromagnetic coils 32 are wound in the space outside the antimagnetic cylinder and inside the shielded magnetic cage shell, and the electromagnetic coils are powered and controlled by a rectified power supply 35.

[0043] Furthermore, the highly magnetically conductive fiber is made of an iron, nickel, silicon, and neodymium alloy using conventional "spinning" technology. It possesses strong magnetic conductivity, low coercivity, a multi-faceted, multi-angled, and barbed cross-section, and good corrosion resistance. The multi-faceted, multi-angled, and barbed cross-section is designed to increase the skin effect, creating more trapping points and thus improving separation capability.

[0044] Furthermore, the squirrel-cage housing employs multiple magnetically conductive pure iron rods embedded in the edges of the upper and lower cover plates. The squirrel-cage design is used because the electromagnetic coil generates heat during operation, and the squirrel-cage design provides excellent heat dissipation. The embedded arrangement increases the contact area between the cover plates and the ribs, thereby enhancing the magnetic conductivity and reducing magnetic resistance. (See...) Figure 3 )

[0045] Furthermore, the backwash wastewater treatment unit includes a backwash high-pressure air pump 34, a backwash water pump 38, an anaerobic reduction backwash concentrate tank 36, a reflux metering pump 41, and solenoid valves 39 and 40.

[0046] The anaerobic reduction backwash concentrate tank 36 can be made of reinforced concrete, fiberglass, plastic, or stainless steel, depending on the scale of the system's water treatment capacity. The tank is sealed and has a conical bottom structure, which allows for stratified sedimentation of different densities while also providing anaerobic reduction reaction functionality.

[0047] The magnetic separation filter cavity is filled with 5% high-permeability fiber metal wire by mass-volume ratio. The magnetic separation electromagnetic coil group is powered by a conventional rectifier power supply 35. The conventional rectifier power supply rectifies the AC power into DC and can adjust the constant current and voltage to supply the magnet.

[0048] When starting the backwashing process, first shut off the rectifier power supply system 35, solenoid valves 40, 43, 44, and 45, then start the backwash water pump 38 and solenoid valve 39, and start the backwash air pump 34, backwash water pump 38, solenoid valves 39 and 42, etc. The control computer automatically controls the start and stop based on the pressure sensor.

[0049] Another object of the present invention is to provide a computer control system, the computer device including a memory and a processor, the memory storing a computer program, the computer having functions such as automatically monitoring water quality indicators, recording, and controlling the backwashing process through pressure signals. When the computer program is executed by the processor, the processor performs the following steps:

[0050] An intermediate pressurized water pump is installed in series at the outlet of the water tank. The water to be treated enters the antimagnetic cylinder 29 of the magnetic separation unit through pressurization. After magnetic separation, it enters the buffer water tank and is then pressurized by the outlet pressurized pump 38 before being supplied to the user. A backwash air pump is connected to the outlet of the magnetic separation antimagnetic cylinder 29, and an anaerobic reduction backwash liquid concentration tank 39 is connected to the inlet of the magnetic separation antimagnetic cylinder. After the water is treated by magnetic separation, the cylinder tends to be saturated, the pressure difference between the inlet and outlet increases, and after reaching the preset value, the backwash process is started.

[0051] Another object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the following steps:

[0052] The treated water is pressurized and enters the magnetic separation antimagnetic cylinder. After magnetic separation, it enters a buffer tank and is then pressurized by an outlet pressurization pump before being supplied to the user. A backwash air pump is connected to the outlet of the magnetic separation antimagnetic cylinder, and an anaerobic reduction reaction concentration tank for the backwash liquid is connected to the inlet. After the magnetic separation water treatment process, the antimagnetic cylinder tends to be saturated, and the backwash process is automatically started, flushing the flocs collected inside the cylinder into the anaerobic reduction backwash concentration tank. Due to the airtight design and conical bottom of the backwash concentration tank, the denser sediment settles at the bottom and produces an anaerobic reduction reaction. The supernatant is used for a second oxidation coagulation process.

[0053] Another objective of this invention is to provide an information data processing terminal, which is used to realize the automatic control of the water treatment system employing electric field oxidation, electrocoagulation and conventional magnetic field separation, as well as the recording and analysis of operating condition data.

[0054] Based on the above technical solutions and the technical problems solved, please analyze the advantages and positive effects of the technical solution to be protected by this invention from the following aspects:

[0055] First, addressing the technical problems existing in the prior art and the difficulty in solving them, this paper closely analyzes, in conjunction with the technical solution to be protected by this invention and the results and data obtained during the research and development process, how the technical solution of this invention solves the technical problems, and the inventive technical effects brought about by solving these problems. The specific description is as follows:

[0056] This invention provides a water treatment method and system that employs unidirectional pulsed high-voltage electric field discharge oxidation, AC electric field fixed helical wing static disturbance electric field micro-flocculation, conventional magnetic field separation, and anaerobic reduction reaction. A booster pump is installed in series at the outlet of the water source. The water to be treated is pressurized and sequentially enters the unidirectional pulsed high-voltage electric field discharge oxidation device; the AC electric field fixed helical wing static disturbance electric field micro-flocculation device; and the conventional magnetic separation device before entering a conical-bottom anaerobic reduction reaction tank. After being pressurized by the effluent booster pump, the water is supplied to the user. When the magnetic separation device is saturated, a backwashing process is initiated. Backwashing uses steam-water backwashing, and the backwash sludge enters the conical-bottom anaerobic reduction reaction tank. A submersible metering pump is installed in the upper part of the tank. The outlet of the metering pump is connected to the inlet of the unidirectional pulsed high-voltage electric field discharge oxidation device and equipped with an electromagnetic valve, which can be used to further enhance the oxidation and micro-flocculation effect. Because the conical-bottom anaerobic reduction reactor is sealed and has a conical bottom, it can produce anaerobic reduction reaction and high-density sedimentation. A large amount of concentrated sludge settles at the bottom of the cone, while the upper part is mainly clear liquid. The high-valent iron ions in the sludge are reduced to divalent iron ions in the anaerobic environment. The anaerobic reaction can also digest most of the sludge, with a very small amount of residue used for soil improvement. This invention employs a composite water treatment technology system that combines high-frequency unidirectional pulsed electric field oxidation, AC electric field fixed spiral fin electrocoagulation, conventional magnetic field separation, and anaerobic reduction reactor digestion. This system avoids many problems associated with traditional filtration and biological oxidation technologies, effectively reduces the investment and operating costs of water treatment equipment, shortens the treatment cycle, and facilitates fully automated microcomputer management. In terms of infrastructure investment alone, it can save 50-80% of the cost of traditional processes.

[0057] This invention relates to an electronic oxidation coagulation technology that utilizes high-voltage discharge, unidirectional pulses, and oxidation of divalent iron ions or other oxidizable substances in water to trivalent or higher valence bonds. This technology, combined with conventional magnetic separation, can be used to remove iron, manganese, phytoplankton, and fluoride from water, thus purifying the water. In this technology, electronic oxidation oxidizes substances in the water to higher valence bonds through high-voltage electrostatic cation discharge. The oxidation is achieved through unidirectional high-frequency high-voltage electrostatic discharge. In the electrocoagulation unit, under the kinetic energy of appropriate mechanical disturbance, Fe(OH)3 electrocoagulation can also be achieved. Electrocoagulation can coagulate other pollutants in the water into flocs, which are then separated from the water. The combination of electric field oxidation, electrocoagulation, and magnetic separation can also kill algae and some bacteria and viruses in the water. The coagulated flocs can be removed using conventional magnetic separation processes, thereby purifying the water.

[0058] The device of this invention is mainly used in water treatment engineering to improve the efficiency and speed of water treatment. It separates impurities in water through magnetic coagulation particles formed by oxidized iron gel, thereby purifying the water. The decontamination mechanism of iron is a complex effect, simultaneously possessing the following three functions:

[0059] (1) Reduction of iron

[0060] Because iron is a reactive metal with reducing power, it can directly reduce dyes to amine organic compounds in slightly acidic aqueous solutions. Since amine organic compounds are pale in color and easily oxidized and decomposed, the color of the wastewater is reduced. Some heavy metal ions in the wastewater can also be reduced by iron, and other highly oxidizing ions or compounds can be reduced by iron to their less toxic reduced forms.

[0061] (2) Electrolysis of iron

[0062] Iron exhibits electrochemical properties. The products of its electrode reactions include nascent [H] and Fe. 2+ It can react with many components in wastewater through oxidation-reduction reactions, destroy the chromophores or auxochromes of dyes, causing them to break down and lose their chromophore ability; it can decompose macromolecules into small molecule intermediates; and it can transform certain difficult-to-biodegrade chemical substances into substances that are easily biodegraded, thereby improving the biodegradability of water.

[0063] (3) Coagulation and adsorption effect of iron gel

[0064] A large amount of Fe is generated when wastewater is treated under slightly acidic conditions. 2+ and Fe 3+ When the pH is adjusted to alkaline and oxygen is present, flocculent precipitates of Fe(OH)2 and Fe(OH)3 will form. Fe(OH)3 may also hydrolyze to form Fe(OH). 2+ Fe(OH) + The second type of complex ions possesses strong complexing and flocculation properties. This allows the adsorption and coagulation of pre-existing suspended solids in wastewater, as well as insoluble substances produced through micro-electrolysis and color-contributing substances, thereby purifying the wastewater.

[0065] Second, considering the technical solution as a whole or from the perspective of the product, the technical effects and advantages of the technical solution to be protected by this invention are specifically described as follows:

[0066] This invention employs a composite water treatment technology combining electric field oxidation, electrocoagulation, magnetic separation, and anaerobic reduction coagulant. This technology avoids many problems associated with traditional filtration technologies using quartz sand, manganese sand, activated carbon, and other filter media. Due to the cyclical application of the coagulant, the investment and operating costs of water treatment equipment are effectively reduced, and management is facilitated. In terms of infrastructure investment alone, the cost can be reduced by 60-70% compared to traditional processes.

[0067] Third, as supplementary evidence of the inventive step of the claims of this invention, it is also reflected in the following important aspects:

[0068] (1) The expected benefits and commercial value of the technical solution of the present invention after transformation are as follows: Taking the traditional solution with a daily water treatment capacity of 40,000 tons as an example, the present solution can reduce the demand cost of 70 million to 30 million when it is first built. The traditional solution requires the filter media to be replaced every 3 years, and the traditional process also requires the addition of chemicals during operation. The present patent does not require the replacement of filter media and the addition of chemicals.

[0069] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad: The present invention is the first in China and abroad to adopt a combination of electrochemical and physical methods and processes, which is a completely new and effective water treatment solution. It can not only solve a variety of problems that are difficult to solve by traditional solutions, but also allow the equipment to operate normally under a variety of complex working conditions.

[0070] This solution features energy-efficient equipment operation, a small footprint, and a high degree of automation. It completely breaks through the limitations of traditional filtration speed and settling rate, significantly reducing initial installation costs.

[0071] (3) Whether the technical solution of the present invention solves the technical problem that people have been eager to solve but have never been able to succeed: while ensuring the same treatment effect as the traditional contact oxidation method, it greatly reduces the total floor space of the equipment and the maintenance difficulty during operation, and improves the processing speed, thereby effectively reducing energy loss, equipment damage and other hazards in the process.

[0072] Traditional water treatment filtration technologies utilize the penetration effect, resulting in very low operating flow rates. For example, manganese sand filtration has a flow rate of only 6-8 m / h, while activated alumina filtration has a flow rate of only 2-3 m / h, requiring 4-6 hours of operation and a short regeneration cycle of 4-6 hours, thus necessitating a large operating area. In contrast, this patented technology achieves a filtration rate as high as 90-100 m / h, thereby reducing the footprint of the filtration equipment.

[0073] (4) The anaerobic reduction coagulant process of the present invention is the first time that the body insect coagulant is recycled. The use of iron gel coagulation to treat municipal water supply can avoid the problem of dementia caused by traditional aluminum coagulant.

[0074] my country faces severe pressure to achieve carbon neutrality, and the implementation of this technology will play a crucial role in addressing this challenge. For example, using this technology at the Yanji Power Plant can reduce carbon emissions by 800 tons annually. The Yanji Power Plant consists of two 200,000-kilowatt units, generating approximately 4 billion kilowatt-hours of electricity annually. In 2019, thermal power capacity accounted for 1.191 billion kilowatts of China's total installed power generation capacity. It is estimated that after all power plants in my country apply this patent (primarily in the cooling water circulation system), carbon emissions will be reduced by hundreds of millions of tons annually.

[0075] (5) Does the technical solution of the present invention overcome technical bias: it avoids the dosing process in traditional water treatment methods and completely eliminates people's concerns about chemical residues in water treated by traditional methods, because this solution uses electrochemical and physical mechanisms, adsorption and filtration and other methods to treat harmful substances in water. Attached Figure Description

[0076] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0077] Figure 1 This is a flow chart of a water treatment method using electric field oxidation, electric field micro-flocculation, magnetic field separation, and anaerobic reduction provided in an embodiment of the present invention.

[0078] Figure 2 This is a schematic diagram of the water treatment method using electric field oxidation, electric field micro-flocculation, magnetic field separation, and anaerobic reduction provided in the embodiments of the present invention.

[0079] Figure 3 This is a schematic diagram of a water treatment system using electric field oxidation micro-flocculation and high magnetic difference field separation provided in an embodiment of the present invention;

[0080] Figure 4 This is a schematic diagram of the mouse cage inlay structure provided in an embodiment of the present invention. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0082] To address the problems existing in the prior art, the present invention provides a water treatment method and system that employs electric field oxidation, electric field micro-flocculation, conventional magnetic separation, and anaerobic reduction. The present invention will be described in detail below with reference to the accompanying drawings.

[0083] I. Explanatory and Illustrative Embodiments. To enable those skilled in the art to fully understand how the present invention is specifically implemented, this section provides an explanatory and illustrative description of the embodiments described in the claims.

[0084] like Figures 1-2 As shown, the water treatment method using electric field oxidation, electric field micro-flocculation, magnetic field separation, and anaerobic reduction provided in this embodiment of the invention includes the following steps:

[0085] S101, a booster pump is installed in series at the outlet of the water source. The water to be treated enters the electric field oxidation device for oxidation treatment through pressurization; then it enters the electric field electrocoagulation through a flexible connection to form magnetic flocs, and then enters the magnetic separation; after magnetic separation, it enters the buffer water tank, and is then pressurized by the outlet booster pump before being supplied to the user.

[0086] S102, connect a backwash air pump to the water outlet of the magnetic separation antimagnetic cylinder, and connect a backwash liquid concentration tank to the water inlet of the magnetic separation steel wool cylinder.

[0087] S103, when the magnetically separated water becomes saturated, the backwashing process is initiated.

[0088] S104, after the backwash wastewater enters the anaerobic reduction backwash liquid concentration tank, an anaerobic reduction reaction occurs, and the iron in the wastewater is reduced to divalent iron. It is then returned to the oxidation process through a metering pump, which can continue to enhance oxidation and accelerate electrocoagulation. The sludge undergoes anaerobic digestion, and a very small amount of residue is returned to the field for soil improvement and fertilization.

[0089] like Figure 3 As shown, the water treatment system using electric field oxidation, electrocoagulation and magnetic separation provided in this embodiment of the invention includes a unidirectional pulse high-voltage electric field oxidation module 1, an electric field coagulation module 2, a magnetic separation module 3, and a backwash wastewater anaerobic reduction water treatment module 4.

[0090] The unidirectional pulse high-voltage electric field oxidation module unit 1 comprises a function signal generator, a power signal amplifier, a unidirectional anode high-voltage generator, an insulating shell 1, a strong magnetic fiber metal wire, a positive graphite electrode, and a positive graphite electrode fixing insulating block.

[0091] The electric field flocculation unit includes an insulating shell 2, a function signal generator, a power signal amplifier, a dual-cathode emitter, and three insulating blocks. A graphite electrode is inserted at the center of the middle insulating block as the anode, and its area is twice that of a single cathode. Graphite electrodes are inserted between the front and rear insulating blocks as cathodes. The sum of the areas of the two graphite cathodes and the graphite anode is equal. Multiple helical blades are installed at the inner bottom of the insulating shell 2 to agitate the water flow.

[0092] The magnetic field separation module comprises a shielded magnetic cage shell (comprising upper and lower magnetic poles, an electromagnetic coil, a high-permeability fiber metal wire, an antimagnetic filter cylinder, a controllable rectifier power supply, etc.).

[0093] The anaerobic reduction and concentration wastewater tank comprises a cone-bottom concentration tank, a backwash air pump, a backwash water pressurization pump, a return metering pump, and a solenoid valve.

[0094] The backwash concentrate tank is constructed using reinforced concrete, plastic, or stainless steel, depending on the scale of the system's water treatment capacity. The tank is water-sealed and designed with a conical bottom to create a stratified sedimentation effect based on density differences. It also functions as an anaerobic reduction reactor.

[0095] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0096] Example 1

[0097] The electric field oxidation device provided in this embodiment of the invention uses an insulating material as the shell structure, such as PPR, ABS, or USB. High-permeability fiber metal wires are filled inside the first shell, with a space filling ratio of 5% (density / volume ratio). The high-permeability fiber metal wires are made of high-permeability, corrosion-resistant ferrite material using a "spray-drawing" process. They resemble tungsten filaments used in dishwashing, characterized by multiple sharp edges on their cross-section. The irregular filament structure increases the contact area between water and the electrode, accelerating the oxidation rate; it also generates multiple skin effect points, increasing discharge. A graphite electrode is placed at the upper end of the first shell and fixed in the middle of an insulating block. The insulating block serves two purposes: reinforcing the graphite electrode and preventing water seepage between the graphite electrode and the insulating shell. The outer end of the insulating shell of the graphite electrode is connected to the anode of a unidirectional pulse high-voltage generator, and the inner end of the insulating shell is connected to the high-permeability fiber metal wires. Based on the skin effect principle, the high-permeability fiber structure generates millions of skin effect points, resulting in excellent discharge performance. Connecting a unidirectional pulsed high-voltage anode to the high-permeability fiber filament via a graphite electrode produces a high-potential, high-frequency, tunable anode property. Based on the principle of electrostatic attraction, when water containing ferrous ions passes through an insulating cavity fitted with high-permeability fiber filaments, the ferrous ions in the water will be oxidized to ferric or higher ferrous ions. The outlet flange of insulating shell 1 is connected to the inlet flange of insulating shell 2 via a conventional flexible connecting pipe (pipe fitting). Insulating shell 2 contains two cathodes and one anode, primarily to increase the intensity of electro-adsorption. Multiple helical fins are located at the bottom; their main function is to create swirling and turbulent flows when water is introduced, generating multiple vortices. These swirling flows and vortices can produce micro-flocculation using iron as a flocculant.

[0098] The unidirectional pulse high-voltage transmitter provided in this embodiment of the invention uses a traditional power function signal generator as the signal source, and then configures a traditional electronic amplifier, a step-up transformer, and a voltage multiplier module to obtain a unidirectional pulse high-voltage electromotive force of 20,000 to 30,000 volts, which is then discharged through the attraction effect of a high-permeability fiber metal wire. The discharge current is within 9 to 10 mA.

[0099] Electron oxidation is an instantaneous process, calculated by chemical kinetics to be completed within microseconds. After electron oxidation, all ionic substances in the water undergo oxidation. For example, ferrous iron is oxidized to ferric or higher ferric ions, acquiring magnetic properties. These magnetic ions then undergo electrocoagulation to form magnetic flocs, which aggregate impurities in the water. When these magnetic flocs pass through a magnetic separator, they are captured by the separator's magnetic field, separating the impurities from the water and thus purifying it.

[0100] The magnetic separator consists of upper and lower magnetic poles (a pure iron core and a pure iron outer shell), an electromagnetic coil, and a cylindrical separation chamber filled with high-permeability magnetic fibers. When energized, the electromagnetic coil generates an electromagnetic field that flows through the high-permeability magnetic fibers. Magnetic particles in the water within the magnetic separator are attracted by the magnetic force within the magnetic field and captured by the fibers. Theoretically, the magnetic force (Fm) on the particles is positively correlated with the magnetic field strength (H), the magnetic field gradient (dH / dx), and the magnetic susceptibility (x) and volume (V) of the particles. Therefore, under the same magnetic field strength, the separation capacity of a magnetic separator filled with high-permeability magnetic fibers is higher than that of a magnetic separator. The higher the magnetic difference, the stronger the separation capacity and the more intense the effect. Another function of a high magnetic difference is its bactericidal effect. The sterilization mechanism is as follows: First, any structural material that can form a closed circuit can generate an instantaneous loop current when passing through a high magnetic difference field at high speed, which is sufficient to break through the cell wall of bacteria, causing the bacterial plasma to flow out and leading to bacterial inactivation; Second, a high magnetic difference field can significantly and instantaneously increase the osmotic pressure of water, causing bacteria to dehydrate and become inactive.

[0101] A high magnetic gradient refers to the change in magnetic field strength per unit distance. Under a given magnetic field strength, the magnitude of the gradient is related to the magnetization, shape, diameter, and packing ratio of the matrix. High-permeability fiber filament matrix has high magnetization, many sharp edges, small diameter, and low packing ratio (4-6%), with a gradient reaching up to 1000 Gauss / micrometer, unmatched by any other magnetic filter material. Therefore, magnetic separators using high-permeability fiber filament (ferrite) matrix can separate weakly magnetic fine particles with low magnetic susceptibility and small size that cannot be separated by conventional magnetic separators. Furthermore, high-permeability fiber filament (ferrite) matrix also possesses certain physical and chemical stability, low coercivity, numerous collection points, and good water permeability, making it the currently recognized best matrix material. When the separator reaches saturation, utilizing the low coercivity and rapid demagnetization of the fiber filament after power failure, the separated pollutants can be flushed out using steam-water backwashing technology, and then further reduced and separated by sedimentation in an anaerobic reduction concentration tank.

[0102] The magnetic field is powered by a conventional bridge rectifier system, with the current regulated. During operation, the current can be adjusted via a thyristor to obtain different magnetic field strengths as needed.

[0103] The anaerobic reduction sludge collection device can be made of materials such as PVC, cement, and steel plate, depending on the scale, and has an overall conical structure. When the denser iron gel flocs fall into the backwash anaerobic reduction concentration tank after backwashing, they are continuously concentrated by sedimentation under the action of the conical structure. The supernatant can be directly returned to the oxidation unit to enhance the oxidation and coagulation effects.

[0104] The device of this invention is mainly used in water treatment engineering to improve the oxidation effect and filtration speed of the treated water. Impurities in the water are separated by magnetic coagulation particles formed from the oxidized iron gel, thereby achieving water purification.

[0105] Example 2

[0106] Figure 2 This is a schematic diagram of a water treatment system provided in an embodiment of the present invention, which employs electric field oxidation, electric field flocculation, magnetic separation, and anaerobic reduction. The system consists of four parts: 1) unidirectional pulsed high-voltage electric field oxidation; 2) electric field flocculation; 3) magnetic separation; and 4) anaerobic reduction backwash wastewater treatment.

[0107] The unidirectional pulse high-voltage electro-oxidation and electric field coagulation consists of two parts: an electric field oxidation part and an electric field coagulation part. The electric field oxidation part is composed of a function signal generator (10); a power signal amplifier (9); a unidirectional pulse high-voltage transmitter (8); an insulating shell (1); an inlet flange (2) of the insulating shell 1; an outlet flange (3) of the insulating shell 1; an insulating block (5); an oxide graphite electrode (5); and a strong magnetic fiber metal wire (6).

[0108] The electro-coagulation section consists of an insulating shell (12); a coagulation function signal generator (20); a coagulation power signal amplifier (19); a pulsed dual-cathode high-voltage transmitter (18); an inlet flange (13) of the insulating shell 2; an outlet flange (14) of the insulating shell 2; coagulation insulating blocks (21)(22)(23); coagulation graphite cathodes (24)(25); coagulation graphite anodes (26); a spiral wing assembly (15); and a flexible connector (11).

[0109] The magnetic separation part is made of pure iron as the material for the magnetically conductive outer shell (33), and is made into the shape of a mouse cage. The upper and lower cover plates are connected by screws, and the connection is set by inlay (see Figure 4 The outermost layer of the magnet is the antimagnetic cylinder (24). An antimagnetic cylinder (29) is set at the center of the concentric circles of the magnetic pole shell (33), and the antimagnetic cylinder (29) is filled with 5% by mass of high-permeability fiber metal wire (30). An electromagnetic coil (32) is wound in the space outside the antimagnetic cylinder (29) and inside the magnetic pole shell (33) of the magnet. The electromagnetic coil is powered by a conventional rectified power supply (35).

[0110] The fourth part of the water treatment technology using electric field oxidation, electric field flocculation and magnetic separation provided in this embodiment of the invention is backwash wastewater treatment. The backwash wastewater treatment section consists of a backwash air pump (34); a backwash water pump (38); an anaerobic reduction backwash wastewater concentration tank (36); a backwash return metering pump (41); and solenoid valves (44)(27)(37)(41)(42)(43)(40)(39).

[0111] The backwash air pump (34) is a conventional high-pressure air pump;

[0112] The backwash water pressurization pump (38) is a centrifugal pump;

[0113] The backwash anaerobic reduction concentrate tank (36) can be made of reinforced concrete, plastic, stainless steel, fiberglass, or other materials depending on the scale of the system's water treatment capacity. The backwash anaerobic reduction concentrate tank has a conical bottom structure, and the water seal allows for the natural generation of an anaerobic reduction reaction.

[0114] The ferrous ions in the raw water are oxidized by the high-voltage emission electrode of the anode in the insulating shell 1, generating ferric ions with coagulation function and magnetism. After passing through the flexible connector, they enter the electric field to flocculate in the insulating shell 2. At the same time, the other pollutants in the water are coagulated into magnetic flocs by the disturbance of the spiral wing 15 and the electric field of electrode electrocoagulation in the insulating shell 2.

[0115] The treated water is pressurized and enters the magnetic separation cylinder (29). After magnetic separation, it enters the buffer water tank (39) and is then pressurized by the outlet water pressurization pump (38) before being supplied to the user. A backwash air pump (8) is connected to the outlet of the antimagnetic separation cylinder (29), and a backwash concentrate water tank (36) is connected to the inlet of the antimagnetic separation cylinder (29). The antimagnetic separation cylinder can be made of copper alloy, plastic, or corrosion-resistant stainless steel.

[0116] The magnet of the magnetic separation device is composed of a magnet electromagnetic coil (14), a magnetic cage shell (15), and an antimagnetic separation cylinder (9). The magnet electromagnetic coil (32) is powered by a conventional rectified power supply (35), which rectifies the AC power into DC and provides a regulated and stable power supply to the magnet.

[0117] An intermediate booster pump (38) is installed in series at the outlet of the buffer tank (39).

[0118] After a period of water treatment, the magnetic separation device will retain a lot of magnetic coagulation particles and become saturated. At this time, the backwashing process will be started.

[0119] When starting the backwashing process, first turn off the rectifier power supply (35) to remove the magnetic field of the magnet, and at the same time close the solenoid valves (40)(42)(43)(27), start the solenoid valves (39)(41)(37), the pressurized water pump (38), and the high-pressure air pump (34), and flush the coagulated particles trapped by the magnetic field in the magnetic separation cylinder (29) into the backwashing anaerobic reduction concentration reaction tank (36) with air and water. After a period of sedimentation and anaerobic reaction, the ferric iron in the sewage is reduced to ferrous iron and dissolved in the supernatant. The reflux metering pump (41) is used to return it to the oxidation unit to continue to play a role in strengthening oxidation and coagulation. Most of the sludge is digested, and a very small amount of residue can be returned to the field for improvement.

[0120] The magnetic pole shell (33) is made of pure iron and is arranged in a squirrel cage. The magnetic pole shell serves to form a closed magnetic circuit, shield the magnetic field from leakage, and also acts as the skeleton of the magnetic separation magnet. The squirrel cage arrangement is chosen because it provides good heat dissipation and meets the requirements for magnetic conduction.

[0121] II. Application Examples. To demonstrate the inventiveness and technical value of the technical solution of this invention, this section provides application examples of the technical solution of the claims on specific products or related technologies.

[0122] An example installed in Yinshuiwan, Songbei District, Harbin in 2020 illustrates the application of this invention. Yinshuiwan is a national-level development zone in Harbin. Due to extensive excavation, water seepage occurred. This seepage water exhibited characteristics of groundwater, containing high levels of iron, manganese, and hardness. Large-scale discharge into Yinshuiwan caused it to turn yellow and smell foul, causing great suffering to local residents and leading to it being designated as one of Harbin's top 100 projects. To solve this problem, a water treatment engineering platform using this patented technology was constructed. The water to be treated is first filtered and then sent to an electric field oxidation unit, where incompletely oxidized ferrous ions are fully oxidized to ferric ions. After electric field flocculation and coagulation, it enters a magnetic separation unit. The treated water is clear and transparent and is returned to Yinshuiwan. Part of the iron-containing sludge is reused to enhance the oxidation and flocculation effect, and another part is used as a special fertilizer for tree transplantation.

[0123] III. Evidence of the Relevant Effects of the Embodiments. The embodiments of the present invention have achieved some positive effects during research and development or use, and indeed possess significant advantages compared to existing technologies. The following description, in conjunction with data, charts, and other materials from the experimental process, illustrates these advantages.

[0124] The Harbin Yinshuiwan Project has a daily processing capacity of 100,000 tons. Using traditional manganese sand treatment would require 20,000 square meters of land, while this patented technology occupies only 300 square meters and eliminates the need to replace filter media. Most importantly, the backwash water from traditional treatment technologies severely pollutes the local environment, while the backwash volume of this technology is only 1 / 20 to 30 of that of traditional processes, and its high iron content makes it economically valuable.

[0125] It should be noted that embodiments of the present invention can be implemented in hardware, software, or a combination of both. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated-design hardware. Those skilled in the art will understand that the above-described devices and methods can be implemented using computer-executable instructions and / or included in processor control code, for example, such code provided on a carrier medium such as a disk, CD, or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuitry such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field-programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of the above-described hardware circuitry and software, such as firmware.

[0126] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water treatment method employing electric field oxidation electrocoagulation and conventional magnetic separation, characterized in that, The water treatment method employing electric field oxidation electrocoagulation and conventional magnetic separation includes: The treated water is oxidized by a unidirectional high-frequency pulse electric field, electrocoagulated by fixing the spiral fins by an alternating electric field, filtered by conventional magnetic separation, and the backwash water is anaerobic digested and reduced in a backwash anaerobic reduction concentrate tank. The water treatment method employing electric field oxidation electrocoagulation and conventional magnetic separation includes the following steps: Step 1: Ferrous ions in the raw water are oxidized by the high-voltage emission electrode at the anode of the insulating shell 1, generating ferric ions with coagulation function and magnetism. After passing through the flexible connector, the ferric ions enter the micro-flocculation insulating shell 2. Inside the insulating shell 2, the ferric ions are simultaneously disturbed by the spiral wings and electro-flocculated by the electrodes, causing other impurities in the water to coagulate and react into magnetic flocs. Step 2: After the steel wool cylinder in the magnetic separation process filters out the trivalent magnetic flocs, the water flows into the clear water buffer tank. The magnetic separation steel wool cylinder is filled with 5% of its volume of fibrous steel wool. Under the action of the magnetic field, the steel wool forms a high gradient magnetic separation zone in the magnetic separation steel wool cylinder, which intercepts the magnetic coagulated flocs in the water, thereby achieving the effect of purifying the water quality. Step 3: The anode of insulating shell 1 is powered by a function signal generator, amplified by a high-frequency amplifier, and then increased by a voltage multiplier circuit to form a unidirectional pulse high-frequency high-voltage DC electric field. The electrocoagulation of the insulating shell 2 is generated by a function signal generator and amplified by a low-frequency amplifier before being powered; its characteristic is a low-frequency AC electric field; the magnet electromagnetic coil is powered by a conventional rectifier power supply, which rectifies the AC power supply into DC power and simultaneously plays the role of voltage and current stabilization, and supplies it to the magnet after adjustment; after working for a period of time, the magnetic separation water treatment device will retain a large number of coagulated particles in the steel wool and tend to be saturated, which can improve the display of the inlet and outlet pressure difference and control the start of the backwashing process; Step 4: When starting the backwashing process, first turn off the pressurized water pump and the rectifier power supply system. After magnetic separation and demagnetization, start the backwashing air pump and water pump. Simultaneously flush the coagulated particles trapped by the magnetic field in the magnetic separation steel wool cylinder into the conical bottom anaerobic reduction reaction sedimentation tank for sedimentation and anaerobic reduction. The flocculent sediment undergoes anaerobic digestion and produces a reduction reaction to generate divalent iron ion supernatant, which is returned to the insulating shell 1 to further enhance the oxidation and electrocoagulation effect. A very small amount of sludge is dewatered and returned to the field.

2. The water treatment method as described in claim 1, employing electric field oxidation electrocoagulation and conventional magnetic separation, is characterized in that... The backwash anaerobic reduction reactor concentration tank unit includes a backwash air pump, a backwash water pressurization pump, a cone-shaped bottom anaerobic reduction reaction tank, a submersible metering pump, and a solenoid valve; The lower half of the anaerobic reduction reaction concentration tank adopts a cone-bottom design, with a solenoid valve installed at the cone-bottom outlet. A water outlet pipe is installed at the connection between the upper half of the rectangular tank and the cone bottom, connecting to a metering pump. The outlet of the metering pump is connected to the water inlet of the oxide insulating shell. The total volume of the cone bottom is 1 / 4 of the rectangular tank. Depending on the treatment scale, it is made of cement, fiberglass, or metal materials, and the inner surface is coated with an anti-corrosion coating.

3. The water treatment method as described in claim 2, employing electric field oxidation electrocoagulation and conventional magnetic separation, is characterized in that... In the backwash wastewater treatment module, the backwash air pump is a high-pressure air pump; the backwash water pressurization pump is a steam-water backwash. The backwash anaerobic reduction concentrate tank is made of reinforced concrete, plastic, or stainless steel, depending on the scale of the water to be treated by the system.

4. A computer device, characterized in that, The computer device includes a memory and a processor. The memory stores a computer program that, when executed by the processor, causes the processor to perform the water treatment method as described in claim 1, which employs electric field oxidation electrocoagulation and conventional magnetic separation.

5. A computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the water treatment method as described in claim 1, employing electric field oxidation electrocoagulation and conventional magnetic separation.

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