A closed loop ultrasonic power-assisted device, a coal chemical wastewater treatment system and a treatment method

Abstract

The application discloses a closed-loop ultrasonic synergic device, a coal chemical industry wastewater treatment system and method, which comprises a discharge device and a vibration device; the vibration device comprises a vibration generator and a vibration rod; the vibration rod is connected with the vibration generator, and a vibration ring is arranged on the vibration rod; the discharge device comprises an electromagnetic pulser and a discharge electrode; the discharge electrode penetrates through the center of the vibration ring, and the central axis of the discharge electrode coincides with the central axis of the vibration ring. Ultrasonic waves can generate vibration and cavitation effect, and generate heat energy inside pollutant particles, so that a part of pollutants can be directly removed. The closed-loop structure of the vibration ring can make vibration waves superimposed in the central field, and the superimposed ultrasonic vibration waves can make molecular-level organic matters in water and water molecules collide fiercely, so that solvent effect and ionization phenomenon occur; at this time, the discharge device in the central field can directly decompose ionized substances in the central field, so that the water quality is purified.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, more particularly, especially to a closed loop ultrasonic electric device, a coal chemical industry wastewater treatment system and a treatment method. BACKGROUND

[0002] The coal chemical industry wastewater has the characteristics of high salt, high COD and difficult biodegradation, and the water quality cannot be well treated by the conventional coal chemical industry wastewater treatment process such as ultrafiltration, reverse osmosis, ion exchange and the like, so that the produced water is usually used as cooling water, production water, fire-fighting water, infrastructure and greening water and the like which have no strict requirements on water quality, but the utilization value of the water is relatively low, and the water is used for high-pressure boiler water supply which has high utilization value, and it is difficult to meet the water quality requirements by relying on the conventional treatment process alone.

[0003] At present, the coal chemical industry wastewater ultra-pure water treatment process mainly relies on the processes such as ultrafiltration, reverse osmosis, ion exchange resin and the like, but because the organic pollutants contained in the coal chemical industry wastewater include phenols, polycyclic aromatic compounds and nitrogen, oxygen and sulfur-containing heterocyclic compounds and various complex pollutants, it is a typical industrial wastewater containing refractory organic compounds. At present, the EDI desalination equipment is used to treat the wastewater. However, it is found in the treatment process that some small-molecule organic matters exist in the coal chemical industry wastewater and can penetrate through the reverse osmosis membrane. After the small-molecule organic matters penetrate through the reverse osmosis membrane and enter the ion exchange resin in the EDI desalination equipment, the resin will be poisoned and polluted, resulting in the failure of the resin, and the conventional resin needs to be regenerated by acid and alkali, which will generate a large amount of difficult-to-treat regenerated waste liquid, so that the conventional method cannot realize the water inlet requirement of the coal chemical industry wastewater into the high-pressure boiler. Because of the penetration of the small-molecule organic matters in the water, the resin is poisoned and the conventional reverse osmosis, ion exchange and the like cannot be stably operated for a long time. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a closed loop ultrasonic electric device which is used in the coal chemical industry wastewater treatment process and can remove the small-molecule organic matters in the wastewater, so that the wastewater will not damage the ion exchange resin in the subsequent treatment process and make the ion exchange resin fail, and the long-term stable operation can be maintained.

[0005] Further, the present application also provides a coal chemical industry wastewater treatment system.

[0006] Still further, the present application also provides a coal chemical industry wastewater treatment method.

[0007] The technical scheme provided by the present application is as follows:

[0008] A closed loop ultrasonic electric device,

[0009] including a discharge device and a vibration device;

[0010] The vibration device includes a vibration generator and a vibrating rod;

[0011] The vibrating rod is connected to the vibration generator, and the vibrating rod is provided with a vibration ring;

[0012] The discharge device includes an electromagnetic pulse generator and a discharge electrode, the discharge electrode passing through the center of the vibrating ring, and the central axis of the discharge electrode coinciding with the central axis of the vibrating ring.

[0013] The number of vibration rings is two or more, and all vibration rings are arranged side by side with their central axes coinciding.

[0014] The vibration ring includes a support member and a ring member. The upper end of the support member is fixedly connected to the bottom of the ring member, and the lower end of the support member is detachably mounted on the vibration rod.

[0015] The vibration rings are equidistantly mounted on the vibration rod.

[0016] The electromagnetic pulse generator is equipped with a discharge current regulating valve.

[0017] The vibration generator is equipped with a vibration intensity regulating valve.

[0018] A coal chemical wastewater treatment system

[0019] Includes ultrasonic electrostatic precipitators, reverse osmosis equipment, and EDI desalination devices;

[0020] The ultrasonic electrostatic osmosis tank, reverse osmosis equipment, and EDI desalination device are connected in sequence through water pipes. The ultrasonic electrostatic osmosis tank is also equipped with a water inlet for introducing ultrafiltration coal chemical wastewater.

[0021] The ultrasonic electrostatic water tank is equipped with a closed-loop ultrasonic electrostatic device as described above.

[0022] The vibrating rod and the discharge electrode pass through the side wall of the ultrasonic electrostatic water tank and are respectively connected to the vibration generator and the electromagnetic pulse generator located outside the ultrasonic electrostatic water tank.

[0023] The reverse osmosis equipment can be selected from Dow brand TML20D-400 reverse osmosis membrane equipment, which removes organic and inorganic pollutants larger than water molecules in the water through physical interception.

[0024] The EDI desalination device can be selected from the Huazi Grant brand CP1000S EDI module, which separates pollutants in water through ion exchange.

[0025] A method for treating coal chemical wastewater includes the following steps:

[0026] (1) Ultrasonic discharge treatment: The ultrafiltration wastewater is treated by vibration discharge using a closed-loop ultrasonic discharge device. Under the simultaneous action of high voltage and ultrasonic vibration, small molecule organic matter is oxidized and decomposed, and some large molecule organic matter is also oxidized and decomposed.

[0027] (2) Reverse osmosis filtration

[0028] Wastewater that has had small and some large organic molecules removed is then treated by reverse osmosis equipment to remove the remaining large organic molecules, resulting in an aqueous solution containing inorganic matter.

[0029] (3) EDI desalination

[0030] The aqueous solution of inorganic substances is treated by an EDI desalination device to obtain ultrapure water.

[0031] Compared with existing technologies, the closed-loop ultrasonic co-electrode device provided by this invention includes a discharge device and a vibration device. The vibration device includes a vibration generator and a vibrating rod. The vibrating rod is connected to the vibration generator and has a vibration ring. The discharge device includes an electromagnetic pulse generator and a discharge electrode. The discharge electrode passes through the center of the vibration ring, and the central axis of the discharge electrode coincides with the central axis of the vibration ring. Ultrasonic waves can generate vibration and cavitation, and generate heat energy inside pollutant particles, which can directly remove some pollutants. The closed-loop structure of the vibration ring allows vibration waves to be superimposed in the central field. The superimposed high-frequency vibration waves can cause molecular-level organic matter in the water to collide violently with water molecules, resulting in solvent effect and ionization. At this time, adding a discharge device in the central field can directly mineralize the ionized substances in the central field, while the products of the solvent effect, due to their low stability, will vaporize and overflow under the action of current, thereby achieving the effect of purifying water quality. The enhanced synergistic discharge electrode of the vibration wave on the central axis of the vibration ring can oxidize and decompose pollutants in wastewater, quickly remove small molecule organic matter, protect the ion exchange resin in subsequent processes, and improve the wastewater treatment process.

[0032] Meanwhile, the present invention also provides a coal chemical wastewater treatment system, including an ultrasonic electrostatic osmosis tank, a reverse osmosis device, and an EDI desalination device; the ultrasonic electrostatic osmosis tank, the reverse osmosis device, and the EDI desalination device are connected in sequence through water pipes, and the ultrasonic electrostatic osmosis tank is also provided with a water inlet for introducing ultrafiltered coal chemical wastewater; the ultrasonic electrostatic osmosis tank is equipped with a closed-loop ultrasonic electrostatic device; the vibrating rod and the discharge electrode pass through the side wall of the ultrasonic electrostatic osmosis tank and are respectively connected to the vibration generator and the electromagnetic pulse generator located outside the ultrasonic electrostatic osmosis tank. The ultrafiltration wastewater sequentially passes through an ultrasonic electrostatic osmosis tank, a reverse osmosis unit, and an EDI desalination unit. The closed-loop ultrasonic electrostatic osmosis unit in the ultrasonic electrostatic osmosis tank removes small molecule organic matter from the wastewater. The reverse osmosis unit then removes large molecules. The treated wastewater then passes through the EDI desalination unit to remove small molecule inorganic matter, while simultaneously generating reclaimed water. The wastewater entering the EDI desalination unit has already had small molecule organic matter removed, which effectively protects the ion exchange resin in the EDI desalination unit, ensuring long-term stable operation of the equipment and improving wastewater treatment efficiency. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0034] Figure 1 This is a schematic diagram of a closed-loop ultrasonic co-current device.

[0035] Figure 2 This is a schematic diagram of a coal chemical wastewater treatment system.

[0036] In the figure, there are: 1. Closed-loop ultrasonic electrostatic device; 2. Reverse osmosis equipment; 3. EDI desalination device; 4. Ultrasonic electrostatic water tank; 11. Vibration generator; 12. Vibrating rod; 13. Electromagnetic pulse generator; 14. Discharge electrode; 15. Vibration ring; 16. Support component; 17. Ring component; 18. Discharge current regulating valve; and 19. Vibration intensity regulating valve. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0041] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0042] The embodiments of this invention are written in a progressive manner.

[0043] like Figure 1 As shown, a closed-loop ultrasonic electrostatic device 1 includes a discharge device and a vibration device; the vibration device includes a vibration generator 11 and a vibration rod 12; the vibration rod 12 is connected to the vibration generator 11, and a vibration ring 15 is provided on the vibration rod 12; the discharge device includes an electromagnetic pulse generator 13 and a discharge electrode 14, the discharge electrode 14 passes through the center of the vibration ring 15, and the central axis of the discharge electrode 14 coincides with the central axis of the vibration ring 15.

[0044] The vibration generator 11 vibrates, driving the vibrating ring 15 on the vibrating rod 12 to vibrate. The closed-loop structure of the vibrating ring 15 causes the vibration waves to superimpose in the central region of the ring. When water flows through the central region of the ring, the superimposed high-frequency vibration waves cause the molecular-level organic matter in the water to collide violently with water molecules, resulting in solvent effect and ionization. Solvent effect, also known as solvation, refers to the effect of the physical and chemical properties of the solvent on the reaction equilibrium and reaction rate in liquid-phase reactions. The essence of solvation is mainly electrostatic interaction. For neutral solute molecules, increasing the polarity of the solvent can lower the energy of the transition state, thereby lowering the activation energy of the reaction, making the substance less stable and easier to react. Under the solvent effect, the hydrogen bonds in water molecules interact with other molecular-level substances to form a solvent shell, which can cause other molecular-level substances to lose stability or even decompose directly. Ionization refers to the phenomenon where pollutants in water break chemical bonds due to the energy generated by vibration and exist in ionic form. At this point, a discharge device is set up in the central field. Under the excitation of voltage, the unstable molecules are directly oxidized to the final oxidized state, which is the gasification state, thus escaping the sewage overflow. The ionized substances, because they carry an electric charge, can be directly mineralized into non-polluting substances when stimulated by the current, thereby achieving the water purification effect.

[0045] The closed-loop ultrasonic co-electrode device 1 of the present invention has two or more vibration rings 15, all of which are arranged side by side and have their central axes coincident.

[0046] The number of vibration rings 15 can be two, three or more. The more vibration rings 15 there are, the stronger the superposition effect of their vibration waves will be. However, the number of vibration rings 15 is also limited by cost and installation space. The number of vibration rings 15 can be increased or decreased according to the actual installation space and wastewater treatment needs.

[0047] The vibrating ring 15 of this invention includes a support member 16 and a ring member 17. The upper end of the support member 16 is fixedly connected to the bottom of the ring member 17, and the lower end of the support member 16 is detachably mounted on the vibrating rod 12. The purpose of this invention is to maximize the superposition effect of the vibration waves generated by the vibrating ring 15 in the central region, thereby making the superimposed vibration waves greater than the vibration amplitude and intensity generated by a conventional vibrating plate or vibrating rod 12. Small molecule organic matter in the central region collides violently with water molecules, resulting in a dissolution effect and ionization. Under the solvent effect, hydrogen bonds in water molecules interact with other molecular-level substances to form a solvent shell, which can cause them to lose stability or even decompose directly. The greater the vibration intensity in the central region, the more obvious the solvent effect and ionization, and the more thoroughly the small molecule organic matter is decomposed. The vibrating ring 15 is mounted on the vibrating rod 12 via the support member 16, making it easier to arrange multiple vibrating rings 15 in a line, thus aligning the central axes of different ring members 17, resulting in a stronger superposition effect of vibration waves and better removal of small molecule organic matter from wastewater. Meanwhile, the lower end of the support member 16 is detachably mounted on the vibrating rod 12, which facilitates the increase or decrease of the number of vibration rings 15.

[0048] As an optional implementation, the vibration rings 15 are equidistantly mounted on the vibrating rod 12, and the vibration rings 15 extend along the central axis of the ring member 17. The central axes of all the ring members 17 coincide, so that the vibration generator 11 can have a better amplification and superposition effect after vibration.

[0049] As an optional implementation, the electromagnetic pulser 13 is provided with a discharge current regulating valve 18, which allows for adjustment of the discharge current according to different design or implementation requirements, thereby adjusting the efficiency of the closed-loop ultrasonic electrostatic device 1 in treating wastewater.

[0050] As an optional implementation, the vibration generator 11 is equipped with a vibration intensity regulating valve 19. This allows for adjustment of the power of the vibration generator 11 according to different design or implementation requirements, thereby adjusting the efficiency of the closed-loop ultrasonic co-current device 1 in treating wastewater.

[0051] like Figure 2As shown, the present invention also provides a coal chemical wastewater treatment system for treating coal chemical wastewater. The treatment system includes an ultrasonic electrostatic osmosis tank 4, a reverse osmosis device 2, and an EDI desalination device 3. The ultrasonic electrostatic osmosis tank 4, the reverse osmosis device 2, and the EDI desalination device 3 are connected sequentially by water pipes. The ultrasonic electrostatic osmosis tank 4 is also provided with an inlet for introducing ultrafiltered coal chemical wastewater. The ultrasonic electrostatic osmosis tank 4 is equipped with a closed-loop ultrasonic electrostatic device 1. The vibrating rod 12 and the discharge electrode pass through the side wall of the ultrasonic electrostatic osmosis tank 4 and are respectively connected to the vibration generator 11 and the electromagnetic pulse generator 13 located outside the ultrasonic electrostatic osmosis tank 4.

[0052] After ultrafiltration, coal chemical wastewater enters the ultrasonic electrostatic precipitator 4. The closed-loop ultrasonic electrostatic device 1 within the precipitator 4 generates vibration and high-voltage discharge, directly removing small-molecule organic matter and some large-molecule organic matter through solvent effects and ionization. The removal of small-molecule organic matter will not affect subsequent ion exchange resin processes, solving the industry's problem of resin poisoning caused by small-molecule organic matter.

[0053] Water treated in the ultrasonic electrostatic precipitator 4 flows into the reverse osmosis unit 2. The reverse osmosis unit serves as a pretreatment process for the EDI desalination unit 3, ensuring the effluent meets the EDI feed water requirements. The reverse osmosis membrane can retain larger molecules, allowing only smaller molecules, such as water molecules and other small inorganic molecules, to pass through. This significantly reduces organic pollutants and inorganic salts in the water, providing a foundation for subsequent water quality treatment to meet standards.

[0054] Water treated by reverse osmosis unit 2 enters EDI desalination unit 3. EDI desalination unit 3, under the influence of an electric field, causes water molecules in the feed water to dissociate into H+ and OH- at the ion exchange resin interface, continuously regenerating the anion and cation exchange resins in the desalination chamber. During regeneration, the anions and cations in the ion exchange resins are attracted by their respective positive and negative electrodes, migrating through the cation and anion exchange resins towards their corresponding ion-exchange membranes. When these ions pass through the exchange membrane into the concentrate chamber, the salt content in the product water chamber is reduced, thus separating the salt from the water. H+ and OH- recombine to form water, resulting in ultrapure water that meets standards.

[0055] The coal chemical wastewater treatment system provided by this invention treats coal chemical wastewater. Because the closed-loop ultrasonic electrostatic device 1 in the ultrasonic electrostatic water tank 4 removes small molecule organic matter in the wastewater, it will not poison the ion exchange resin in the EDI desalination device 3. It can ensure continuous and stable operation when the effluent meets the standards. At the same time, it eliminates the problem of producing regenerated wastewater that traditional resin regeneration produces, which greatly improves the efficiency of coal chemical wastewater treatment.

[0056] As an optional implementation, the reverse osmosis device 2 is a Dow brand TML20D-400 reverse osmosis membrane device, which removes organic and inorganic pollutants larger than water molecules from the water through physical interception.

[0057] As an optional implementation, the EDI desalination device 3 is a Huazi Grant brand CP1000S EDI module, which separates pollutants in water by ion exchange.

[0058] A method for treating coal chemical wastewater includes the following steps:

[0059] (1) Ultrasonic discharge treatment: The ultrafiltration wastewater is subjected to vibration discharge treatment by a closed-loop ultrasonic co-electric device 1. Under the simultaneous action of high voltage and ultrasonic vibration, small molecule organic matter is oxidized and decomposed, and some large molecule organic matter is also oxidized and decomposed.

[0060] (2) Reverse osmosis filtration

[0061] Wastewater that has had small molecule organic matter and some large molecule organic matter removed is treated by reverse osmosis equipment 2 to remove the remaining large molecule organic matter, resulting in an aqueous solution containing inorganic matter.

[0062] (3) EDI desalination

[0063] The aqueous solution of inorganic substances is treated by EDI desalination device 3 to obtain ultrapure water.

[0064] The following experiments were conducted using the coal chemical wastewater treatment method provided by this invention.

[0065] The experimental site for this project is located within the China Chemical Wastewater Treatment Plant in Xiaoyi, Shanxi Province. The project name is Coal Chemical Ultrapure Water Pilot Project, and the experimental manufacturer is Huazi Grant Environmental Protection Technology (Beijing) Co., Ltd. The pilot-scale water treatment capacity is 1 ton / hour.

[0066] Example 1

[0067] like Figure 1 As shown, a method for treating coal chemical wastewater includes the following steps:

[0068] (1) Ultrasonic discharge treatment: The ultrafiltration wastewater is subjected to vibration discharge treatment by a closed-loop ultrasonic co-electric device 1. Under the simultaneous action of high voltage and ultrasonic vibration, small molecule organic matter is oxidized and decomposed, and some large molecule organic matter is also oxidized and decomposed.

[0069] (2) Reverse osmosis filtration

[0070] Wastewater that has had small molecule organic matter and some large molecule organic matter removed is treated by reverse osmosis equipment 2 to remove the remaining large molecule organic matter, resulting in an aqueous solution containing inorganic matter.

[0071] (3) EDI desalination

[0072] The aqueous solution of inorganic substances is treated by EDI desalination device 3 to obtain ultrapure water.

[0073] Comparative Example 1

[0074] Compared to Example 1, this treatment method omits step (1), and the wastewater is directly filtered through reverse osmosis and then desalinated by EDI.

[0075] The TOC (total organic carbon) of the water obtained after reverse osmosis filtration and EDI desalination in Example 1 and Comparative Example 1 was measured by a total organic carbon analyzer, and the results are listed in the table below.

[0076]

[0077] Overall, in Comparative Example 1 without the closed-loop ultrasonic co-current device described in this invention, the water quality after reverse osmosis filtration was not affected by the increase in treatment time; however, the water production effect after EDI desalination became increasingly worse, proving that small molecule substances that can poison the resin do exist in the water. In Example 1, adding the ultrasonic co-current device not only improved the final effluent quality but also showed no decreasing trend in effectiveness after 20 days of continuous operation. This indicates that the closed-loop ultrasonic co-current device described in this invention can effectively remove small molecule organic matter in the water that can poison the resin. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A closed-loop ultrasonic co-current device, characterized in that: Includes discharge devices and vibration devices; The vibration device includes a vibration generator (11) and a vibrating rod (12). The vibrating rod (12) is connected to the vibration generator (11), and the vibrating rod (12) is provided with a vibration ring (15). The discharge device includes an electromagnetic pulse generator (13) and a discharge electrode (14), the discharge electrode (14) passing through the center of the vibrating ring (15), and the central axis of the discharge electrode (14) coinciding with the central axis of the vibrating ring (15).

2. The closed-loop ultrasonic co-current device as described in claim 1, characterized in that: The number of the vibration rings (15) is two or more, and all the vibration rings (15) are arranged side by side with their central axes coinciding.

3. The closed-loop ultrasonic co-current device as described in claim 2, characterized in that: The vibration ring (15) includes a support member (16) and a ring member (17). The upper end of the support member (16) is fixedly connected to the bottom of the ring member (17), and the lower end of the support member (16) is detachably mounted on the vibrating rod (12).

4. The closed-loop ultrasonic co-current device as described in claim 3, characterized in that: The vibration ring (15) is equidistantly mounted on the vibration rod (12).

5. The closed-loop ultrasonic co-current device as described in claim 4, characterized in that: The electromagnetic pulse generator (13) is equipped with a discharge current regulating valve (18).

6. The closed-loop ultrasonic co-current device as described in claim 5, characterized in that: The vibration generator (11) is equipped with a vibration intensity regulating valve (19).

7. A treatment system for coal chemical wastewater, characterized in that: Includes an ultrasonic electrostatic water tank (4), a reverse osmosis device (2), and an EDI desalination device (3); The ultrasonic electrostatic water tank (4), the reverse osmosis equipment (2) and the EDI desalination device (3) are connected in sequence through water pipes. The ultrasonic electrostatic water tank (4) is also provided with an inlet for introducing ultrafiltration coal chemical wastewater. The ultrasonic electrostatic water tank (4) is equipped with a closed-loop ultrasonic electrostatic device (1) as described in any one of claims 1-6. The vibrating rod (12) and the discharge electrode (14) pass through the side wall of the ultrasonic electrostatic water tank (4) and are respectively connected to the vibration generator (11) and the electromagnetic pulse generator (13) located outside the ultrasonic electrostatic water tank (4).

8. A method for treating coal chemical wastewater, characterized in that... Includes the following steps: (1) Ultrasonic discharge treatment: The wastewater after ultrafiltration is subjected to vibration discharge treatment using the closed-loop ultrasonic discharge device (1) as described in any one of claims 1-6. Under the simultaneous action of high voltage and ultrasonic vibration, small molecule organic matter is oxidized and decomposed, and some large molecule organic matter is also oxidized and decomposed. (2) Reverse osmosis filtration Wastewater that has had small molecule organic matter and some large molecule organic matter removed is treated by reverse osmosis equipment (2) to remove the remaining large molecule organic matter and obtain an aqueous solution containing inorganic matter; (3) EDI desalination An aqueous solution containing inorganic substances is treated by an EDI desalination device (3) to obtain ultrapure water.

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