Unsymmetrical dimethylhydrazine wastewater treatment system and method based on electrolysis principle

Abstract

The invention belongs to the field of aerospace ground equipment, and discloses an unsymmetrical dimethylhydrazine wastewater treatment system and method based on an electrolysis principle. Comprising a pretreatment device which is a secondary filter and is communicated with an unsymmetrical dimethylhydrazine wastewater source; the ozone reaction tank is used for pre-oxidation treatment of unsymmetrical dimethylhydrazine wastewater, and the ozone reaction tank is communicated with the secondary filter; the electrochemical oxidation device is communicated with the ozone reaction tank; the tail gas treatment device is used for treating gas generated after the wastewater is treated by the electrochemical oxidation device. The method can be used for innocent treatment of unsymmetrical dimethylhydrazine wastewater solution serving as a rocket normal-temperature propellant, so that the unsymmetrical dimethylhydrazine wastewater solution reaches the emission standard.

Description

Technical Field

[0001] This patent relates to the field of aerospace ground equipment and specifically discloses a system and method for treating UDMH wastewater based on electrolysis. This system can be used to decontaminate UDMH wastewater solutions, used as a rocket propellant at room temperature, to meet discharge standards. Background Art

[0002] The description of the background technology in the present invention belongs to the related technology related to the present invention and is only used to illustrate and facilitate understanding of the invention content of the present invention. It should not be understood that the applicant explicitly believes or infers that the applicant believes that it is the prior art of the present invention on the filing date of the first application.

[0003] As one of the fuels for rockets and missiles using room-temperature propellants, UDMH is a highly toxic substance. Its wastewater solution has great destructive power on the ecological environment, animals and plants. According to national laws and regulations, it needs to be treated to meet the standards before it can be discharged.

[0004] Currently, the common method used in China is to chemically react strong oxidizing substances such as sodium hypochlorite, ozone, and hydrogen peroxide with UDMH to decompose it into small organic and inorganic molecules. This reaction is time-consuming, complex, and requires expensive reagents. Furthermore, this method requires large amounts of highly unstable oxidants, making them difficult to store for long periods of time. This method cannot meet the requirements for the ready generation and treatment of UDMH wastewater solutions. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a system and method for treating UDMH wastewater based on the electrolysis principle.

[0006] An unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle, comprising:

[0007] A pretreatment device, wherein the pretreatment device is a two-stage filter and is connected to a source of unsymmetrical dimethylhydrazine wastewater;

[0008] An ozone reaction tank is used for pre-oxidation treatment of UDMH wastewater, and the ozone reaction tank is connected to the secondary filter;

[0009] An electrochemical oxidation device, the electrochemical oxidation device being in communication with the ozone reaction tank;

[0010] The tail gas treatment device is used to treat the gas generated after the electrochemical oxidation device treats wastewater.

[0011] Furthermore, the ozone reaction tank is connected to the ozone generating system.

[0012] Furthermore, the electrochemical oxidation device adopts direct oxidation or indirect oxidation.

[0013] Furthermore, the ozone reaction tank is a coupled treatment of ozone oxidation, ultraviolet radiation, and titanium dioxide. A UV lamp and a photocatalyst are installed in the ozone reaction tank. The ozone reaction tank adopts a baffled design, and the ozone and wastewater flow in the same direction. The ozone is distributed using a titanium aeration plate. The UV lamp is an ozone type.

[0014] Furthermore, the electrochemical reactor is composed of a series of electrolytic cell groups, the sewage is electrolyzed in the cell, and the anode surface is in contact with the sewage; the electrochemical oxidation device includes a power supply, a BDD reaction cell and a BDD electrochemical module.

[0015] Furthermore, in the BDD electrochemical module, the BDD electrode is used as the anode for wastewater electrolysis, and the titanium plate is used as the cathode for wastewater electrolysis. The two electrodes are stacked with a gap of 3 mm to form an electrode module.

[0016] Furthermore, the ozone reaction tank is connected to an ozone generation system, which includes a dust removal secondary filter and an ozone generator. Oxygen is removed from the dust removal secondary filter and then enters the ozone generator. After being decompressed and stabilized, it enters the ozone generation chamber. Within the ozone generation chamber, some of the oxygen is converted into ozone through high-voltage discharge. The product gas is then monitored and regulated for temperature, pressure, and flow rate before being output from the ozone outlet.

[0017] Furthermore, the unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle includes a control system, which is composed of an unsymmetrical dimethylhydrazine wastewater control cabinet, a PLC control cabinet, a field transmitter, and an actuator.

[0018] Furthermore, the control system is provided with an alarm device, and when any analog measurement value exceeds a given range or the switch value changes, the control system triggers an alarm.

[0019] A method for treating unsymmetrical dimethylhydrazine wastewater based on the electrolysis principle comprises the following steps: pre-treating the unsymmetrical dimethylhydrazine wastewater and then introducing the wastewater into an ozone reaction tank for pre-oxidation treatment; electrochemically oxidizing the pre-oxidation wastewater using an electrochemical oxidation device, and treating the generated tail gas using a tail gas treatment device; and providing ozone to the ozone reaction tank by an ozone generation system.

[0020] The embodiments of the present invention have the following beneficial effects:

[0021] The system of the present invention has the ability to treat unsymmetrical dimethylhydrazine wastewater, has low equipment maintenance and operating costs, consumes reagents that are conventionally purchased, does not use hazardous chemicals, and does not generate solid waste;

[0022] The treatment capacity of the UDMH wastewater treatment equipment for UDMH wastewater with a concentration of not less than 300 mg / L is 2m 3 / h, the concentration of UDMH after treatment is ≤0.5mg / L;

[0023] The continuous operation time of this system is ≥8h, the trouble-free operation time is ≥1000h, the input voltage is AC380V±10%, the input power is 20kw±10%;

[0024] The equipment is small in size, and the size of the installation room does not exceed: 5.2m × 7.2m × 3m (length × width × height);

[0025] After treatment, the wastewater treatment system meets the following indicators: pH value between 6-9; suspended solids ≤150mg / L; five-day biochemical oxygen demand ≤30mg / L; chemical oxygen demand ≤120mg / L; cyanide ≤0.5mg / L; formaldehyde ≤2mg / L; unsymmetrical dimethylhydrazine ≤0.5mg / L; monomethylhydrazine ≤0.2mg / L; hydrazine ≤0.1mg / L; ammonia nitrogen ≤25mg / L; nitrite nitrogen ≤0.1mg / L. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of electrochemical oxidation principle;

[0027] Figure 2 is the chemical formula for electrochemical oxidation;

[0028] Figure 3 This is a schematic diagram of the UDMH wastewater treatment system based on the electrolysis principle of the present invention;

[0029] Figure 4 This is a layout diagram of the unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle of the present invention in a container;

[0030] Figure 5 Schematic diagram of the electrochemical reactor structure of the present invention;

[0031] Figure 6 This is a schematic structural diagram of the spray absorption tower of the present invention;

[0032] Figure 7 Schematic diagram of the control system structure of the present invention. DETAILED DESCRIPTION

[0033] The present application will be further described below with reference to the embodiments.

[0034] To more clearly illustrate the embodiments of the present invention or technical solutions in the prior art, different "one embodiment" or "embodiment" in the following description do not necessarily refer to the same embodiment. Different embodiments may be replaced or combined. Those skilled in the art can also derive other implementation methods based on these embodiments without inventive effort.

[0035] According to the analysis results of the water quality of UDMH wastewater, in order to solve the high COD, high UDMH concentration and intermediate products of the UDMH treatment process in the wastewater and meet the wastewater discharge standards, the system adopts pretreatment combined with electrocatalytic oxidation treatment technology.

[0036] The pretreatment mainly uses a secondary filter to remove impurities such as suspended matter, scum, colloidal particles in the wastewater, and pre-oxidizes the wastewater by coupling ozone and ultraviolet catalysis. Then, the strong oxidizing property of BDD electrocatalysis is used to oxidize and decompose the unsymmetrical dimethylhydrazine in the wastewater, thereby removing pollutants such as organic matter and electrolysis intermediates.

[0037] Electrochemical oxidation utilizes the electron-withdrawing effect of the anode to oxidize pollutants in wastewater. The reaction process can be divided into direct and indirect oxidation. Direct oxidation occurs when organic matter in the wastewater loses electrons directly at the anode and is oxidized. Indirect oxidation generates strong oxidizing intermediates through the anodic reaction or intermediates generated by reactions other than the anodic reaction (such as OH radicals). These free radicals then oxidize pollutants in the wastewater, ultimately achieving the goal of oxidative degradation of organic pollutants. This solution couples BDD electrocatalytic oxidation with ultraviolet light to increase system treatment efficiency and reduce overall investment.

[0038] The principle diagram of electrochemical oxidation reaction is shown in Figure 1 .

[0039] The chemical formula of electrochemical oxidation reaction is shown in the figure Figure 2 .

[0040] Electrocatalytic oxidation technology does not require the addition of any neutralizing agents during the reaction process, nor does it produce sludge or secondary pollution. Electrochemical oxidation equipment can be designed as a modular skid, with extremely low operational difficulty and simple operation and maintenance. It can be combined in series and parallel according to the scale of treatment. At the same time, electrochemical oxidation equipment has a fast reaction speed and a short residence time, so it occupies a small area. Electrochemical oxidation needs to react in a liquid with a certain conductivity to ensure low operating energy consumption. If the conductivity is insufficient, an appropriate amount of electrolyte can be added to the water to be treated. The key technology of electrochemical oxidation is the life and oxidation capacity of the anode. The anode plate of this technology uses boron-doped diamond (BDD) material, which has a long service life and low maintenance costs.

[0041] 2.2 Process flow

[0042] The system adopts a combined process of "filtration + ozone + ultraviolet" pretreatment technology combined with electrocatalytic oxidation to treat unsymmetrical dimethylhydrazine wastewater to meet standards. The wastewater is treated by a water inlet pump through a secondary filter and then enters the electrolytic reaction tank. It is then returned to the electrolytic reaction tank through a circulating pump through a secondary filter, an ozone ultraviolet reaction system, and a heat exchange system for circulation treatment. The system pipeline is equipped with flow meters, thermometers, conductivity meters, valves and supporting facilities to treat the wastewater to meet standards. The process flow chart is shown in Figure 3 .

[0043] 2.3 System composition

[0044] The unsymmetrical dimethylhydrazine wastewater treatment equipment is mainly composed of wastewater transportation system, wastewater reaction system, ozone generation system, waste gas treatment system, control system, piping system, etc.

[0045] The system is mainly divided into two modules: UDMH wastewater treatment system and ozone generation system.

[0046] The UDMH wastewater treatment system primarily includes a secondary filter, ozone reactor, electrocatalytic oxidation unit, tail gas absorber, circulation pump, heat exchanger, pipeline valves, electronic control system, and supporting ancillary facilities. The system measures 6000mm x 1500mm and is constructed using 10# channel steel for its integrated design.

[0047] The ozone generation system mainly includes an air purification system, an ozone generation system, an exhaust gas decomposition device, a valve, an electronic control system, and supporting ancillary facilities. The overall dimensions are 2500mm×1900mm, and it is designed with 10# channel steel for integration.

[0048] The device has the ability to treat unsymmetrical dimethylhydrazine wastewater. The treatment efficiency of the device is about 40% higher than that of traditional ozone oxidation, but the power consumption of the system operation is basically the same, and the overall operating cost is low. At the same time, the system composition is simple and the maintenance cost is low. The consumable reagents are all conventionally purchased items, no hazardous chemicals are used, and no solid waste is generated.

[0049] The treatment capacity of the UDMH wastewater treatment equipment for UDMH wastewater with a concentration of not less than 300 mg / L is 2m 3 / h, the concentration of UDMH after treatment is ≤0.5mg / L.

[0050] The continuous operation time of this system is ≥8h, the trouble-free operation time is ≥1000h, the input voltage is: AC380V±10%, the input power is: 20kw±10%.

[0051] The equipment is small in size, and the size of the installation room does not exceed: 5.2m × 7.2m × 3m (length × width × height);

[0052] After treatment, the system meets the following wastewater treatment indicators: pH value between 6-9; suspended solids ≤150mg / L; five-day biochemical oxygen demand ≤30mg / L; chemical oxygen demand ≤120mg / L; cyanide ≤0.5mg / L; formaldehyde ≤2mg / L; unsymmetrical dimethylhydrazine ≤0.5mg / L; monomethylhydrazine ≤0.2mg / L; hydrazine ≤0.1mg / L; ammonia nitrogen ≤25mg / L; nitrite nitrogen ≤0.1mg / L. The effluent quality of this technology after application in similar projects is as follows:

[0053] pH value between 6-9; suspended solids 6mg / L; five-day biochemical oxygen demand ≤2.7mg / L; chemical oxygen demand ≤11mg / L; cyanide ≤0.002mg / L; formaldehyde ≤0.05mg / L; unilateral dimethylhydrazine ≤0.12mg / L; monomethylhydrazine ≤0.12mg / L; hydrazine ≤0.02mg / L; ammonia nitrogen ≤0.78mg / L; nitrite nitrogen 0.01mg / L.

[0054] Wastewater transportation system

[0055] The wastewater transportation system mainly consists of a submersible pump, a secondary filter, a flow meter, a manual valve, an electric valve and corresponding connecting pipes.

[0056] The main function of the submersible pump is to transport the wastewater in the collection pool to the treatment equipment. A manual ball valve and a check valve are installed at the pump outlet, as well as a pressure gauge and an electromagnetic flowmeter.

[0057] The secondary filter is installed after the submersible pump. It can filter particulate matter in the wastewater, reduce turbidity in the water, intercept and remove suspended matter, particulate impurities, organic matter, colloidal particles, microorganisms, chlorine odor and some heavy metal ions in the water, ensure that the water softener is not contaminated, and also ensure that the water output is clearer.

[0058] Wastewater reaction system

[0059] The wastewater reaction system is mainly composed of an ozone reaction tank and an electrocatalytic unit, which uses ozone ultraviolet oxidation and electrocatalytic oxidation to treat pollutants in UDMH wastewater to meet standards.

[0060] The ozone reactor primarily combines ozone oxidation, UV radiation, and titanium dioxide. Using the UV lamp and loaded photocatalyst within the reactor, ozone reacts with organic matter in the wastewater to decompose it into carbon dioxide, water, and small organic molecules. The ozone reactor utilizes a baffled design, with ozone and influent flowing in the same direction. Titanium aeration plates are used for ozone distribution. The UV lamp is ozone-type.

[0061] Electrochemical reactors (such as Figure 5The BDD electrocatalytic oxidation process (shown in Figure 1) consists of a series of electrolytic cells, with the electrolytic cell serving as the core reactor. Wastewater is electrolyzed within the cell. The anode surface, in contact with the wastewater, can directly oxidize organic matter and characteristic pollutants in the wastewater, along with other oxidizable substances. Under the action of the electric field, the electrochemical region ionizes hydroxyl radicals, which are highly oxidizing. Hydroxyl radicals are active groups that can rapidly oxidize organic matter and characteristic pollutants in the wastewater, thereby reducing COD and characteristic pollutants. The BDD electrocatalytic oxidation process primarily consists of a power supply, a BDD reaction cell, and a BDD electrochemical module.

[0062] The power supply is a key component in providing electrical energy, providing the required voltage and current to the electrodes in the BDD reactor. Depending on the processing requirements and application scenarios, the appropriate power supply and voltage and current values ​​can be selected.

[0063] The BDD reactor is the container that conducts the electrolysis reaction and is typically made of corrosion-resistant, insulating materials. The BDD reactor houses an electrochemical module, with the BDD electrode serving as the anode, connected to the cathode via a power supply. During the electrolysis process, an electric field is generated between the anode and cathode, promoting ion migration and redox reactions.

[0064] The electrocatalytic module utilizes a BDD electrode as the anode for wastewater electrolysis and a titanium plate as the cathode. The two electrodes are stacked with a 3mm gap to form the electrode module. Tantalum rods are used as conductors to connect the anodes of the electrode module. Wastewater flows through these sections at a constant flow rate, utilizing the direct and indirect oxidation effects of the BDD anode to degrade COD in the wastewater. The electrocatalytic power supply is a 42V DC power supply.

[0065] The electrochemical module is installed in the reaction tank. Wastewater is lifted by the conveying system to the ozone reaction tank and then enters the electrolysis tank. A circulating pump then transports the wastewater to the heat exchange unit for cyclic electrolysis. Once it meets the required standards, it can be discharged through the drain valve. An exhaust gas discharge device is installed on the top of the electrolysis tank to promptly remove gases such as carbon dioxide generated during the electrolysis reaction.

[0066] The electrolytic reaction tank is mainly composed of the reaction tank body, electrolytic module, instrument and supporting piping system.

[0067] Set up a water inlet, water outlet, vent, air inlet, and air outlet. During circulating electrolysis, the drain valve is closed, the circulating pipeline valve is opened, and the wastewater undergoes circulating electrolysis in the reaction tank. When draining the electrolytic reaction tank, open the drain valve, close the circulating pipeline valve, and the treated wastewater that meets the standards is transported to the clean water tank through a circulating pump. During the electrolysis reaction, the thermal effect of the current releases heat, causing the wastewater temperature to rise. At the same time, the decomposition reaction of the compound releases a large amount of heat energy, which also causes the wastewater temperature to rise. The temperature of the electrochemical system needs to be controlled below a certain temperature. Therefore, a cooling system is set up to cool the wastewater during circulating electrolysis to ensure the continuous and stable operation of the entire electrochemical system.

[0068] Ozone generation system

[0069] The ozone system utilizes unpressurized oxygen from the factory and is equipped with an oxygen booster system. The oxygen passes through a secondary dust removal filter (filtration level up to 0.1μm) to remove impurities before entering the ozone generator. After decompression and voltage stabilization, it enters the ozone generation chamber. Within the ozone generation chamber, some of the oxygen is converted into ozone through high-voltage discharge. The product gas is then monitored and regulated for temperature, pressure, and flow rate before being released through the ozone outlet. The ozone generation chamber is equipped with an ozone intake port, and the ozone generator's outlet concentration is monitored online using an ozone concentration detector installed within the ozone generator.

[0070] The ozone generator cooling water system is designed to utilize a closed-circuit circulating cooling water system, which uses heat exchangers to provide cooling water for the ozone generator. This closed-circuit circulating water cooling system includes a plate heat exchanger, circulating water pump, expansion tank, and valves. A flow switch and temperature transmitter are installed in the ozone generator cooling water outlet pipe to generate alarms when the cooling water flow is insufficient or the temperature exceeds the set value.

[0071] An ozone leak detector is installed in the ozone preparation room. When the ozone / oxygen leakage in the preparation room environment exceeds the standard, the system will decide to output an alarm, start the exhaust fan or shut down the machine based on the detection signal.

[0072] Ozone gas from the ozone preparation room is led to the oxidation tower through the ozone main pipe. The top of the oxidation tower is equipped with a two-way air permeability safety valve and an exhaust gas discharge port. The exhaust gas in the oxidation tower is demisted by the demister to remove water mist before entering the exhaust gas destroyer.

[0073] Exhaust gas treatment system

[0074] The exhaust gas generated by the electrolysis treatment system is collected by a fan and then connected to the existing exhaust gas treatment device. The exhaust fan promptly removes the gas generated by electrolysis through the exhaust port set on the reaction tank. At the same time, the reaction tank is also equipped with an air inlet to introduce fresh air from the outside.

[0075] The exhaust gas treatment system features two exhaust fans, a spray tower, and two spray pumps. The exhaust fans, as power equipment, primarily ensure smooth airflow and prevent pressure buildup. They are designed to be zero-leakage, ensuring on-site safety.

[0076] Spray absorption tower ( Figure 6)The main function is to ensure that harmful gases are completely absorbed by water or absorption liquid, and the gases are discharged in compliance with the standards. The exhaust gas is introduced into the absorption tower through the air inlet pipe, passes through the packing layer, and the exhaust gas and the aqueous solution flow in countercurrent to fully contact and absorb the gas-liquid two-phase. After purification, the gas-liquid separation is carried out through the demister and discharged into the atmosphere. The aqueous solution is pressurized by the spray pump at the bottom of the tower and then sprayed down at the top of the tower. Finally, it flows back to the circulation storage tank at the bottom of the tower for recycling. The spray absorption system is mainly composed of the absorption tower body, the air distribution system, the packing, the spray device, the demister, etc. The packing is mainly used as an air distribution device and is arranged at the lower part of the spray device of the spray absorption tower. After the exhaust gas passes through the air distribution system, it is evenly distributed to the entire absorption reaction zone cross-section. In addition to evenly distributing the exhaust gas in the main spray area, the absorption reaction zone tray also allows the exhaust gas to fully contact the liquid film area of ​​the absorption liquid on the tray. The tray structure consists of porous plates with separating weirs. The trays are placed horizontally on a supporting structure. The spray absorber is filled with two layers of packing, each 0.5m high, for a total of 1.0m. The system uses Pall rings, which offer high porosity, are resistant to breakage, and are corrosion-resistant. Furthermore, point contact between individual packing elements ensures continuous liquid film renewal, resulting in minimal pressure drop and high mass transfer efficiency.

[0077] The spray system is a network of distribution manifolds and nozzles. Hollow cone nozzles are installed on the spray layer to atomize the spray liquid. The spray liquid is delivered to the nozzles by a spray liquid circulation pump and sprayed into the absorption reaction zone, absorbing water-soluble pollutants in the gas and achieving purification. The spray system ensures uniform distribution of the slurry within the absorption tower, ensuring equal flow through each spray section. This spray device is custom-made.

[0078] The spray pump, installed next to the spray absorption tower, recirculates the spray liquid within the absorption reaction zone. It utilizes a chemical centrifugal pump, including the pump casing, impeller, shaft, guide bearing, outlet elbow, baseplate, seal box, shaft seal, base frame, mechanical seal, and all piping, valves, on-site instrumentation, and motor. The operating principle is that the centrifugal force generated by the high-speed rotation of the impeller imparts energy to the fluid. This increases both the pressure and kinetic energy of the fluid passing through the impeller, allowing it to be transported to higher or more distant locations. Simultaneously, negative pressure is created at the pump inlet, ensuring continuous fluid suction. The pump head is constructed of corrosion-resistant materials.

[0079] The demister is used to separate liquid droplets carried by exhaust gas. After the exhaust gas passes through the spray liquid and then continuously flows through the demister, the droplets are retained on the baffle due to inertia, achieving the purpose of gas-liquid separation. The demister is located at the top of the spray absorption tower.

[0080] control system

[0081] Control System( Figure 7The system primarily consists of a UDMH wastewater control cabinet, a PLC control cabinet, field transmitters, and actuators. A programmable logic controller (PLC) collects field transmitter parameters and device information, controls various on-site devices, and achieves automated wastewater treatment. The system utilizes an automated control configuration that meets experimental requirements, addresses processes that are difficult to operate manually, and records process parameters required for research.

[0082] The control system is required to control and regulate the wastewater treatment process so that the indicators of the treated wastewater meet the required range. The functions are as follows:

[0083] (1) Manual automatic control function

[0084] The control system can realize manual and automatic control functions to complete the control of the entire process. It is divided into two-site three-level control mode. The two sites refer to local and remote, and the three levels refer to the on-site manual level, the remote manual level (touch screen), and the remote automatic level (touch screen).

[0085] (2) Real-time monitoring function

[0086] Graphically display the process and the operating conditions of the controlled equipment in real time. Monitor liquid level, temperature, motor frequency, motor current, pH meter, conductivity and other values ​​in real time.

[0087] The pH value of the liquid is displayed in real time, and the concentration and saturation of the absorption liquid are monitored by the pH counter. The liquid level gauge determines the height of the liquid in the device, preventing the motor from idling, which could cause equipment damage or more serious consequences. The pH value interlocks the control valve to control liquid discharge and follow-up dosing.

[0088] (3) Data management

[0089] Based on the speed of change and importance of different operating parameters, a production history database is established to store the collected raw data for statistical analysis.

[0090] (4) Alarm function

[0091] When the measured value of an analog quantity (such as temperature, liquid level, pH value, etc.) exceeds a given range or a switch value changes position, the control system triggers an alarm. If one or more of these indicators exceeds the system's set range, the system will display detailed alarm information on the alarm interface on the touch screen and issue an alarm signal through the audible and visual alarm buzzer, prompting on-site personnel to respond promptly.

[0092] The control system utilizes a multi-level distributed architecture, with nodes arranged according to process segment relevance, enhancing reliability and flexibility. Each system independently determines and processes its own tasks, maintaining consistency with the master system's sequence and status. This improves overall system fault handling capabilities while minimizing the impact of subsystem failures on each other. Compared to centralized control architectures, this enhances system scalability, reduces the impact of single points of failure, and reduces wiring costs.

[0093] It should be noted that the above embodiments can be freely combined as needed. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle, characterized in that: include: A pretreatment device, wherein the pretreatment device is a two-stage filter and is connected to a source of unsymmetrical dimethylhydrazine wastewater; An ozone reaction tank is used for pre-oxidation treatment of UDMH wastewater, and the ozone reaction tank is connected to the secondary filter; An electrochemical oxidation device, the electrochemical oxidation device being in communication with the ozone reaction tank; The tail gas treatment device is used to treat the gas generated after the electrochemical oxidation device treats wastewater.

2. The UDMH wastewater treatment system based on the electrolysis principle according to claim 1, characterized in that: The ozone reaction tank is connected to the ozone generating system.

3. The UDMH wastewater treatment system based on the electrolysis principle according to claim 1, characterized in that: The electrochemical oxidation device adopts direct oxidation and indirect oxidation.

4. The UDMH wastewater treatment system based on the electrolysis principle according to claim 1, characterized in that: The ozone reaction tank is a coupled treatment system of ozone oxidation, ultraviolet radiation, and titanium dioxide. A UV lamp and a photocatalyst are installed in the ozone reaction tank. The ozone reaction tank adopts a baffled design, and the ozone and wastewater flow in the same direction. The ozone is distributed using a titanium aeration plate. The UV lamp is ozone-type.

5. The unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle according to claim 1 is characterized in that: The electrochemical reactor is composed of a series of electrolytic cell groups, the sewage is electrolyzed in the cell, and the anode surface is in contact with the sewage; the electrochemical oxidation device includes a power supply, a BDD reaction cell and a BDD electrochemical module.

6. The unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle according to claim 5 is characterized in that: In the BDD electrochemical module, the BDD electrode is used as the anode for wastewater electrolysis, and the titanium plate is used as the cathode for wastewater electrolysis. The two electrodes are stacked with a gap of 3mm to form an electrode module.

7. The UDMH wastewater treatment system based on electrolysis principle according to claim 1, characterized in that: The ozone reaction tank is connected to an ozone generation system, which includes a secondary dust removal filter and an ozone generator. Oxygen is removed from the secondary dust removal filter and then enters the ozone generator. After being decompressed and stabilized, it enters the ozone generation chamber. Within the ozone generation chamber, some of the oxygen is converted into ozone through high-voltage discharge. The product gas is then monitored and regulated for temperature, pressure, and flow rate before being released from the ozone outlet.

8. The unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle according to claim 1 is characterized in that: The unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle includes a control system, which is composed of an unsymmetrical dimethylhydrazine wastewater control cabinet, a PLC control cabinet, a field transmitter, and an actuator.

9. The unsymmetrical dimethylhydrazine wastewater treatment system based on the electrolysis principle according to claim 8, characterized in that: The control system is provided with an alarm device, and when any analog measurement value exceeds a given range or a switch value changes position, the control system triggers an alarm.

10. A method for treating unsymmetrical dimethylhydrazine wastewater based on the principle of electrolysis, characterized in that: The method comprises the following steps: pre-treating unsymmetrical dimethylhydrazine wastewater and then introducing the wastewater into an ozone reaction tank for pre-oxidation treatment; electrochemically oxidizing the wastewater after pre-oxidation treatment by an electrochemical oxidation device; and treating the generated tail gas by a tail gas treatment device; and the ozone reaction tank is provided with ozone by an ozone generation system.

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