Multi-stage sewage filtering method of sewage treatment device

Abstract

The invention discloses a multi-stage filtration method for sewage by a sewage treatment device, and relates to the technical field of multi-stage filtration methods, sewage enters the sewage treatment device along a sewage input port, is primarily filtered in a first filter plate, and is subjected to a chemical reaction with a sewage reactant in a reaction cavity; carrying out secondary filtration on the sewage subjected to primary filtration; the vibration module in the reaction cavity vibrates a sewage reactant, the sewage reaction mode that the sewage subjected to primary filtration reacts while vibrating is achieved, a fluid medium is output, the fluid medium output through the reaction cavity is finally filtered in the second filter plate, primary filtration, sewage reaction and final filtration of the sewage are compatible, and the efficiency is improved. A vibration mode is introduced into the sewage reaction, so that the multi-stage filtering effect of the sewage treatment device on the sewage is improved, and a self-cleaning mode of the sewage treatment device is introduced, so that the second filtering plate, the sewage reactant and the first filtering plate are self-cleaned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-stage filtering method, and particularly relates to a multi-stage filtering method of a sewage treatment device for sewage. BACKGROUND

[0002] With the development of science and technology, sewage treatment devices are applied to people's life and filter sewage. In the prior art, a filter plate is built in a sewage treatment device, and sewage is filtered through a through hole of the filter plate. However, particles filtered from sewage can still be blocked in the filter plate, which affects the filtration of sewage. The sewage treatment device in the prior art mainly performs single-layer filtration through the filter plate, and ignores the reaction and blocking of sewage reactants, which affects the multi-stage filtration of the sewage treatment device for sewage. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provides a multi-stage filtering method of a sewage treatment device for sewage.

[0004] The present application provides a multi-stage filtering method of a sewage treatment device for sewage, which comprises the following steps. Sewage enters the sewage treatment device through a sewage inlet and is subjected to primary filtration in a first filter plate. The sewage is separated into a plurality of first particles in the primary filtration. The sewage subjected to the primary filtration converges towards a reaction cavity of the sewage treatment device and can contact sewage reactants in the reaction cavity. At this time, the sewage reacts with the sewage reactants in the reaction cavity and is subjected to secondary filtration to form corresponding dirt. The vibration module in the reaction cavity vibrates the sewage reactants to adjust the reaction efficiency of the sewage reactants on the sewage and the gap between adjacent sewage reactants, so as to realize a sewage reaction mode in which the sewage subjected to the primary filtration is vibrated and reacted at the same time, and output fluid medium. The fluid medium output from the reaction cavity is subjected to final filtration in a second filter plate. The fluid medium is separated into dirt in the final filtration, and the dirt is stored in the reaction cavity and the second filter plate. Drainage data of the sewage treatment device is collected, and a drainage change amount of the fluid medium is determined according to the drainage data. The self-cleaning mode of the sewage treatment device is triggered based on the drainage change amount of the fluid medium. At this time, the input of the sewage is stopped in the self-cleaning mode, and the second filter plate, the sewage reactants and the first filter plate are impacted by the fluid medium in the reverse direction until the drainage change amount of the fluid medium is less than a preset drainage change amount threshold.

[0005] Compared with the prior art, the present application has the following advantages: In this embodiment of the invention, wastewater enters the wastewater treatment device through the wastewater inlet and undergoes primary filtration in the first filter plate, separating multiple first particles. The wastewater after primary filtration converges towards the reaction chamber of the wastewater treatment device and comes into contact with the wastewater reactants in the reaction chamber. At this time, the wastewater undergoes a chemical reaction with the wastewater reactants in the reaction chamber, and the wastewater after primary filtration undergoes secondary filtration to form corresponding dirt. The vibration module in the reaction chamber vibrates the wastewater reactants to adjust the reaction efficiency of the wastewater reactants on the wastewater and the gap between multiple adjacent wastewater reactants, realizing a wastewater reaction mode of vibration and reaction of the wastewater after primary filtration, and outputting a fluid medium. The fluid medium output from the reaction chamber undergoes final filtration in the second filter plate, separating dirt in the final filtration. The dirt is stored in the reaction chamber and the second filter plate, which is compatible with primary filtration, wastewater reaction and final filtration of wastewater, and introduces a vibration mode in the wastewater reaction, improving the multi-stage filtration effect of the wastewater treatment device.

[0006] Furthermore, wastewater discharge data from the wastewater treatment device is collected, and the change in the amount of fluid medium discharge is determined based on this data. The self-cleaning mode of the wastewater treatment device is triggered based on the change in the amount of fluid medium discharge. At this time, the input of wastewater is stopped in the self-cleaning mode, and the second filter plate, wastewater reactants, and first filter plate are impacted by the fluid medium in the reverse direction until the change in the amount of fluid medium discharge is less than the preset threshold for the amount of fluid medium discharge. The self-cleaning mode of the wastewater treatment device is introduced, and the fluid medium is impacted in the reverse direction along the same flow channel to self-clean the second filter plate, wastewater reactants, and first filter plate, thereby improving the clogging of the second filter plate, wastewater reactants, and first filter plate and ensuring the discharge efficiency of the fluid medium. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the multi-stage filtration method for sewage by the sewage treatment device in an embodiment of the present invention; Figure 2 This is a schematic flowchart of step S11 in the multi-stage filtration method for sewage by the sewage treatment device in this embodiment of the invention. Figure 3 This is a schematic flowchart of step S12 in the multi-stage filtration method for sewage by the sewage treatment device in this embodiment of the invention. Figure 4 This is a schematic flowchart of step S13 in the multi-stage filtration method for sewage by the sewage treatment device in this embodiment of the invention. Figure 5 This is a schematic flowchart of step S14 in the multi-stage filtration method for sewage by the sewage treatment device in this embodiment of the invention. Figure 6This is a schematic flowchart of step S15 in the multi-stage filtration method for sewage by the sewage treatment device in this embodiment of the invention. Detailed Implementation

[0008] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0009] Please see Figures 1 to 6 A multi-stage filtration method for wastewater in a wastewater treatment device, applied in a multi-stage filtration scenario; the multi-stage filtration method for wastewater in a wastewater treatment device includes: Step S11: Wastewater enters the wastewater treatment device through the wastewater inlet and undergoes primary filtration in the first filter plate, where multiple first particles are separated from the wastewater. Step S12: The wastewater after primary filtration converges towards the reaction chamber of the wastewater treatment device and can come into contact with the wastewater reactants in the reaction chamber. At this time, the wastewater undergoes a chemical reaction with the wastewater reactants in the reaction chamber, and the wastewater after primary filtration is subjected to secondary filtration to form the corresponding dirt. Step S13: The vibration module in the reaction chamber vibrates the wastewater reactants to adjust the reaction efficiency of the wastewater reactants on the wastewater and the gap between multiple adjacent wastewater reactants, realizing the wastewater reaction mode of vibrating and reacting simultaneously after primary filtration, and outputting fluid medium. Step S14: The fluid medium output from the reaction chamber undergoes final filtration in the second filter plate, during which dirt is separated from the fluid medium and stored in the reaction chamber and the second filter plate. Step S15: Collect the drainage data of the sewage treatment device, determine the drainage change of the fluid medium based on the drainage data, and trigger the self-cleaning mode of the sewage treatment device based on the drainage change of the fluid medium. At this time, in the self-cleaning mode, the input of sewage is stopped, and the second filter plate, sewage reactants and the first filter plate are impacted by the fluid medium in the reverse direction until the drainage change of the fluid medium is less than the preset drainage change threshold.

[0010] refer to Figure 2 In step S11, the sewage enters the sewage treatment device through the sewage inlet and undergoes primary filtration in the first filter plate, where the sewage is separated into multiple first particles. In the specific implementation of this invention, the specific steps are as follows: S111: The top of the sewage treatment device is provided with a sewage inlet. Sewage enters the internal space of the sewage treatment device from the sewage inlet and flows along the drainage channel of the sewage inlet-first filter plate, and enters multiple first filter holes of the first filter plate; the multiple first filter holes are arranged in an array along the annular direction on the first filter plate. S112: Wastewater undergoes primary filtration under the action of multiple first filter holes, separating multiple first particles. These multiple first particles cannot penetrate the multiple first filter holes and are restricted by the first filter plate.

[0011] In the embodiments of this application, the top of the sewage treatment device is provided with a sewage inlet. Sewage enters the internal space of the sewage treatment device from the sewage inlet and flows along the drainage channel of the sewage inlet-first filter plate, and enters a plurality of first filter holes of the first filter plate. The plurality of first filter holes are arranged in an array along the annular direction on the first filter plate, and the first filter plate is introduced to achieve the primary filtration of sewage by the first filter plate.

[0012] At this point, the top of the sewage treatment device is equipped with a sewage inlet. Sewage enters the internal space of the sewage treatment device from the sewage inlet. This design utilizes gravity to allow the sewage to flow naturally into the device, reducing energy consumption. The inlet is usually designed to prevent splashing to prevent sewage from overflowing during the entry process. It may also be equipped with a grille or preliminary filter to prevent large objects from entering the system.

[0013] Wastewater flows along the drainage channel of the wastewater inlet to the first filter plate. The drainage channel is a specially designed flow guiding structure to ensure that the wastewater flows evenly and orderly to the first filter plate. This design avoids the wastewater directly impacting the filter plate, reducing wear and tear, and improving filtration efficiency. The wastewater enters multiple primary filter holes on the first filter plate. The primary filter holes are the key structure of the initial filtration, and their size and distribution directly affect the filtration effect. These filter holes are usually designed according to the characteristics of the wastewater being treated. The hole size needs to balance filtration efficiency and flow rate requirements. Optionally, the first filter plate of a certain industrial wastewater treatment device is made of stainless steel, with a filter hole diameter of 3 mm and a 5 mm spacing between each hole. When industrial wastewater reaches the first filter plate, the water flow is dispersed into each filter hole, achieving effective separation of large particulate impurities.

[0014] Multiple first filter holes are arranged in an array along a ring direction on the first filter plate; the ring array arrangement is an optimized design that can improve filtration efficiency and extend the service life of the filter plate. This arrangement allows the water flow to be evenly distributed across the entire surface of the filter plate, avoiding local overload.

[0015] Furthermore, the wastewater undergoes primary filtration through multiple first filter holes, separating multiple first particles. These first particles cannot penetrate the multiple first filter holes and are confined by the first filter plate.

[0016] At this point, the wastewater undergoes primary filtration through multiple first filter pores. This process is based on the principle of physical filtration, utilizing the size selectivity of the filter pores to allow water molecules to pass through while trapping larger particles of pollutants. The size design of the filter pores is a key factor, usually determined according to the characteristics of the wastewater to be treated and the treatment requirements. In practical applications, for example, the diameter of the first filter pore of an industrial wastewater treatment device is designed to be 2 mm. This size can effectively trap sand, fibers, and other large particulate impurities in the wastewater, while allowing water and dissolved substances to pass through.

[0017] In the primary filtration process, multiple first particles are separated. The separation of particles is based on the principle of size exclusion, that is, particles larger than the filter pore size cannot pass through the pores and are thus trapped on one side of the filter plate. This separation process depends not only on the particle size, but also on factors such as particle shape, density and flow rate. Multiple first particles cannot pass through multiple first filter pores and are restricted by the first filter plate. This step reflects the trapping mechanism of the filtration process. The filter plate acts as a physical barrier to prevent large particles from entering the subsequent treatment stages. The trapped particles accumulate on the surface of the filter plate to form a filter cake layer. This layer itself also becomes a filter medium, further improving the filtration efficiency.

[0018] refer to Figure 3 In step S12, the wastewater after primary filtration converges toward the reaction chamber of the wastewater treatment device and comes into contact with the wastewater reactants in the reaction chamber. At this time, the wastewater undergoes a chemical reaction with the wastewater reactants in the reaction chamber, and the wastewater after primary filtration is subjected to secondary filtration to form the corresponding dirt. In the specific implementation of this invention, the specific steps are as follows: S121: A drainage channel for the first filter plate-reaction chamber is formed between the first filter plate and the reaction chamber of the sewage treatment device. Sewage after primary filtration by the first filter plate flows along the drainage channel for the first filter plate-reaction chamber. S122: A sub-converging channel is formed in the drainage channel of the first filter plate-reaction chamber. The sewage after primary filtration by the first filter plate converges under the guidance of the sub-converging channel and flows toward the reaction chamber. S123: The reaction chamber contains multiple wastewater reactants, which are arranged sequentially along the annular direction and stacked sequentially along the vertical direction. At this time, the wastewater after primary filtration by the first filter plate enters the reaction chamber and reacts chemically with the multiple wastewater reactants to output the corresponding fluid medium. At the same time, the wastewater after primary filtration is subjected to secondary filtration to form the corresponding dirt.

[0019] In an embodiment of this application, a drainage channel for the first filter plate and the reaction chamber of the wastewater treatment device is formed between the first filter plate and the reaction chamber. Wastewater that has undergone primary filtration by the first filter plate flows along the drainage channel of the first filter plate and is introduced into the drainage channel of the first filter plate and the reaction chamber so that the wastewater that has undergone primary filtration by the first filter plate can enter the reaction chamber.

[0020] At this point, a drainage channel is formed between the first filter plate and the reaction chamber of the wastewater treatment device, describing the physical channel design for transporting wastewater to the reaction chamber after primary filtration. The drainage channel typically adopts an inclined or tapering structure to ensure that the wastewater flows naturally under gravity, reducing energy consumption. The channel material is mostly corrosion-resistant stainless steel or engineering plastic, with a smooth inner wall to reduce resistance and prevent particle adhesion. In actual design, the channel inclination angle is generally controlled between 15 and 30 degrees, which ensures the gravity flow effect without causing the flow rate to be too fast due to excessive steepness, thus affecting subsequent treatment.

[0021] After primary filtration by the first filter plate, the wastewater flows along the drainage channel of the first filter plate-reaction chamber. The wastewater after primary filtration contains small particulate suspended solids and dissolved pollutants. These substances do not change significantly during the flow in the channel, but the flow state will affect the subsequent treatment effect. The channel design needs to take into account the principles of fluid mechanics to avoid turbulence or dead zone formation and ensure that the wastewater enters the reaction chamber in a laminar flow state.

[0022] Furthermore, a sub-converging channel is formed in the drainage channel of the first filter plate-reaction chamber. The sewage after primary filtration by the first filter plate converges under the guidance of the sub-converging channel and flows towards the reaction chamber, realizing the convergence of sewage and ensuring that the sewage fully enters the reaction chamber.

[0023] At this point, a sub-converging channel is set up inside the main drainage channel. The sub-converging channel usually adopts a conical or funnel-shaped design, and its cross-sectional area gradually decreases along the water flow direction to form a convergence effect. This design can effectively collect sewage from different areas of the main drainage channel and prevent the formation of flow dead zones. The material of the sub-converging channel is the same as that of the main channel, but the smoothness of the inner wall is required to be higher, usually requiring a roughness Ra value of less than 0.4μm, in order to minimize flow resistance. Optionally, the convergence angle of the sub-converging channel is generally controlled between 8 and 15 degrees. Too large an angle will cause flow separation, while too small an angle will increase the channel length and cost.

[0024] Wastewater that has undergone primary filtration by the first filter plate converges under the guidance of the sub-converging channel, describing the convergence process of wastewater in the sub-converging channel. Wastewater after primary filtration enters the sub-converging channel from various areas of the main drainage channel. Under the action of the converging structure, the dispersed wastewater flow gradually concentrates. During this process, the wastewater flow velocity gradually increases, and pressure energy is converted into kinetic energy, forming an accelerated flow state. The design of the sub-converging channel ensures that wastewater can converge evenly, avoiding the phenomenon of excessively high or low local flow velocities. At the same time, guide vanes or flow straightening devices may be installed in the channel to further optimize the flow state and reduce the formation of turbulence and eddies.

[0025] The outlet of the sub-converging channel is usually precisely aligned with the inlet of the reaction chamber to form a sealed connection, preventing sewage leakage and air ingress. The channel outlet may be equipped with a diffuser or rectifier to appropriately reduce the flow velocity of high-speed sewage before entering the reaction chamber, thereby reducing the impact on the sewage reactants inside the reaction chamber. At the same time, the outlet direction may be designed to be tangential or at a specific angle, so that the sewage can form an ideal flow pattern after entering the reaction chamber, such as swirling or circulating flow, to enhance the contact effect with the reactants.

[0026] Therefore, the reaction chamber contains multiple wastewater reactants, which are arranged sequentially along the annular direction and stacked sequentially along the vertical direction. At this time, the wastewater after primary filtration by the first filter plate enters the reaction chamber and reacts chemically with the multiple wastewater reactants to output the corresponding fluid medium. At the same time, the wastewater after primary filtration undergoes secondary filtration to form the corresponding dirt and introduce multiple wastewater reactants. The wastewater enters the reaction chamber and reacts chemically with the multiple wastewater reactants.

[0027] At this point, the reaction chamber contains multiple wastewater reactants, which are arranged sequentially along a ring direction and stacked vertically. The wastewater reactants typically include various functional materials such as chemical agents, biological carriers, and filter materials, arranged in a specific spatial pattern within the reaction chamber. The ring arrangement ensures that the wastewater can fully contact the reactants, while the vertical stacking forms a multi-stage treatment layer, allowing different types of pollutants to be removed step by step. Optionally, the reactants are usually filled in specially designed reaction baskets or packing racks. These containers have sufficient porosity to both accommodate the reactants and allow wastewater to pass through freely.

[0028] Wastewater, after primary filtration through the first filter plate, enters the reaction chamber and undergoes chemical reactions with multiple wastewater reactants to output the corresponding fluid medium. This describes the wastewater treatment process within the reaction chamber. The primary filtered wastewater enters the reaction chamber through a sub-converging channel, first contacting the upper layer of activated carbon. The activated carbon removes organic matter, color, and odor from the water through adsorption. Subsequently, the wastewater flows through a biological ceramic particle layer, where the microbial community attached to the surface of the ceramic particles biodegrades nutrients such as ammonia nitrogen and total phosphorus. In the PAFC slow-release agent layer, the slowly released aluminum and iron ions react with colloidal substances in the water to form larger flocs. The zeolite molecular sieve layer removes heavy metal ions and hardness substances from the water through ion exchange, while the bottom manganese sand filter media removes iron, manganese, and other metal ions through catalytic oxidation. This series of chemical reactions and physicochemical processes work together to effectively remove pollutants from the wastewater, ultimately outputting the fluid medium.

[0029] Secondary filtration was performed on the wastewater after primary filtration to form corresponding fouling. The filtration process and fouling formation mechanism within the reaction chamber were described. In addition to the chemical reaction, the reactants in the reaction chamber also played a role in secondary filtration. The filter layer formed by porous materials such as activated carbon, bio-ceramic particles, zeolite molecular sieves, and manganese sand filter media can trap fine particles that are still suspended in the water after primary filtration. These particles include incompletely settled suspended solids, flocs generated by chemical reactions, and microbial metabolic products. As the treatment process continues, these trapped substances gradually accumulate and form a fouling layer on the surface and in the gaps between the reactants.

[0030] refer to Figure 4 In step S13, the vibration module in the reaction chamber vibrates the wastewater reactants to adjust the reaction efficiency of the wastewater reactants on the wastewater and the gap between multiple adjacent wastewater reactants, thereby realizing the wastewater reaction mode of vibrating and reacting simultaneously after primary filtration, and outputting the fluid medium. In the specific implementation of this invention, the specific steps are as follows: S131: The reaction chamber is equipped with a vibration module located in the middle of the reaction chamber, which performs circular vibration on the wastewater reactants in the reaction chamber to achieve the vibration mode of the wastewater reactants. S132: The wastewater reactants adjust the corresponding gaps under vibration to achieve full reaction of the wastewater. The wastewater after primary filtration undergoes a wastewater reaction mode of vibration and reaction in the reaction chamber, so as to output the fluid medium in the outlet of the reaction chamber.

[0031] In the embodiments of this application, a vibration module is built into the reaction chamber. The vibration module is located in the middle of the reaction chamber and performs circular vibration on the wastewater reactants in the reaction chamber to realize the vibration mode of the wastewater reactants, thus introducing the vibration mode of the wastewater reactants.

[0032] At this point, the vibration module typically consists of a vibration motor, a transmission mechanism, and a vibration head, all installed at the center of the reaction chamber. This central arrangement ensures that vibration energy is evenly distributed to the reactants throughout the entire reaction chamber. The vibration motor is usually a variable frequency motor, which can adjust the vibration frequency and amplitude according to processing requirements. The transmission mechanism converts the rotational motion of the motor into circular vibration, and the vibration head acts directly on the reactant layer, producing a circular wave-like vibration effect. Optionally, the vibration module needs to consider factors such as the size of the reaction chamber, the characteristics of the reactants, and processing requirements.

[0033] Circular vibration refers to the propagation of vibration energy from the center outward in the form of a circular wave, causing the reactants to undergo minute displacements in both the radial and tangential directions. This vibration method can effectively prevent the reactants from compacting and hardening, and maintain the uniformity and permeability of the reactant gaps. The vibration modes usually include two modes: high-frequency micro-vibration and low-frequency strong vibration, which can be switched according to the processing requirements. In actual operation, the vibration parameters need to be precisely controlled according to the characteristics of the reactants and the processing requirements.

[0034] Furthermore, the wastewater reactants adjust their corresponding gaps under vibration, achieving full reaction of the wastewater. The wastewater after primary filtration undergoes a wastewater reaction mode of simultaneous vibration and reaction in the reaction chamber, so as to output the fluid medium at the outlet of the reaction chamber, thus realizing the output of the fluid medium.

[0035] At this point, in a static state, a relatively fixed gap network forms between reactant particles (such as activated carbon, zeolite, or ion exchange resin). When the vibration module operates, the ring vibration causes the reactant particles to undergo minute displacements and rotations, resulting in periodic changes in the gaps between particles. This dynamic adjustment process breaks the original fixed gap structure, forming a more uniform and variable gap network. Precise control of the vibration frequency and amplitude can optimize the gap size. Generally, low-frequency, large-amplitude vibration is conducive to forming large-gap channels, while high-frequency, small-amplitude vibration is conducive to forming small-gap networks. Optionally, the dynamic adjustment of reactant gaps needs to consider factors such as reactant particle size, shape, density, and vibration parameters.

[0036] After primary filtration, the wastewater enters the reaction chamber and, under vibration, forms a special "vibration-reaction" treatment mode with the reactants. In this mode, the flow path of the wastewater in the reaction chamber is no longer a simple straight line or spiral, but rather forms complex turbulence and eddies under vibration, greatly extending the contact time between the wastewater and the reactants. At the same time, the micro-shear force generated by vibration can destroy the boundary layer on the surface of the reactants, reduce mass transfer resistance, and make it easier for pollutants to approach the active sites of the reactants. In actual operation, this synergistic mode is usually divided into three stages: First, after the wastewater enters the reaction chamber, it is rapidly dispersed into the entire reactant layer under vibration; second, under continuous annular vibration, the wastewater and reactants undergo efficient mass transfer and reaction; finally, the treated fluid medium converges towards the discharge port under the impetus of vibration.

[0037] After sufficient reaction treatment, the fluid medium is driven by vibration to converge at the outlet of the reaction chamber; the outlet is usually designed as an annular shape or multiple small holes, located at the top or upper side of the reaction chamber, to ensure that only water that meets the treatment standards can be discharged; the vibration helps to prevent reactant particles from clogging the outlet, while promoting the rapid discharge of the fluid medium; optionally, the outlet system usually includes a collection device, an anti-clogging device, and a water quality monitoring device.

[0038] refer to Figure 5 In step S14, the fluid medium output from the reaction chamber undergoes final filtration in the second filter plate, where dirt is separated and stored in the reaction chamber and the second filter plate. In the specific implementation of this invention, the specific steps are as follows: S141: A drainage channel between the reaction chamber and the second filter plate is formed. The fluid medium discharged from the reaction chamber flows along the drainage channel between the reaction chamber and the second filter plate and gradually approaches the second filter plate. S142: The second filter plate is provided with multiple second filter holes. The diameter of the second filter holes is smaller than that of the first filter holes. The multiple second filter holes allow the fluid medium to pass through and block the dirt discharged from the reaction chamber from passing through. At this time, the second filter plate supports the dirt discharged from the reaction chamber and restricts the further downward flow of the dirt discharged from the reaction chamber. Meanwhile, the fluid medium undergoes final filtration in the second filter plate.

[0039] In the embodiments of this application, a drainage channel between the reaction chamber and the second filter plate is formed. The fluid medium discharged from the reaction chamber flows along the drainage channel between the reaction chamber and the second filter plate and gradually approaches the second filter plate so that the fluid medium output from the reaction chamber can pass through the second filter plate.

[0040] At this point, the drainage channel of the reaction chamber-second filter plate typically adopts a gradually expanding structure, meaning that the cross-sectional area of ​​the channel gradually increases from the outlet of the reaction chamber to the inlet of the second filter plate. This design can effectively reduce the water flow velocity, reduce turbulence, and allow the fluid medium to flow smoothly to the second filter plate. The inner wall of the channel is usually equipped with a guide plate or flow straightening device to further optimize the water flow distribution and ensure that the water flow reaches all areas of the second filter plate evenly. Optionally, parameters such as the slope, cross-sectional area change rate, and length of the drainage channel need to be accurately calculated based on factors such as the amount of water to be treated, the water quality, and the area of ​​the second filter plate.

[0041] After being processed in the reaction chamber, the fluid medium exhibits a laminar flow state in the drainage channel, with the flow velocity gradually decreasing and the pressure gradually increasing. This flow characteristic facilitates the natural settling of any small particles that may remain in the fluid medium as they approach the second filter plate, reducing the filtration burden on the second filter plate. The flow guiding device in the channel can guide the water flow to form a spiral flow path, prolonging the residence time of the water flow in the channel and improving the settling efficiency. In practical applications, this flow process requires precise control of hydraulic conditions to ensure the best filtration effect.

[0042] Furthermore, the second filter plate is provided with multiple second filter holes, the diameter of which is smaller than that of the first filter hole. The multiple second filter holes allow the fluid medium to pass through while blocking the dirt discharged from the reaction chamber from passing through. At this time, the second filter plate supports the dirt discharged from the reaction chamber and restricts the further downward flow of the dirt discharged from the reaction chamber. Meanwhile, the fluid medium undergoes final filtration in the second filter plate, which is compatible with primary filtration, wastewater reaction and final filtration of sewage. Vibration mode is introduced into the wastewater reaction, which improves the multi-stage filtration effect of the wastewater treatment device on sewage.

[0043] At this point, the second filter plate is usually manufactured using high-precision processing technology. It has a large number of tiny filter holes evenly distributed on it. The pore diameter of these second filter holes is designed to be significantly smaller than that of the first filter plate, forming a fine filtration link in the multi-stage filtration system. For example, the pore diameter of the first filter hole may be in the range of 0.5-1.0 mm, while the pore diameter of the second filter hole is usually in the range of 0.05-0.2 mm. The specific value depends on the final requirements of the treated water quality. The shape of the filter hole can be circular, square or other special shapes. The arrangement of the holes is usually an equilateral triangle or square array to maximize the porosity while ensuring structural strength.

[0044] When the water from the reaction chamber reaches the second filter plate, dissolved substances and extremely small particles in the fluid medium can pass through the filter holes, while larger suspended solids, colloidal substances, and dirt generated by the reaction are intercepted on the surface of the filter plate. This filtration process is mainly based on the principle of physical sieving, and the pore size of the filter holes determines the minimum particle size that can be intercepted. Optionally, the interception efficiency of the filter holes depends not only on the pore size but also on factors such as water flow velocity, particle shape, and surface charge.

[0045] As the filtration process continues, the intercepted dirt gradually accumulates on the surface of the second filter plate, forming a filter cake layer. The second filter plate must have sufficient mechanical strength and rigidity to withstand the weight of the filter cake layer and the water flow pressure, preventing deformation or breakage. At the same time, the structural design of the filter plate needs to ensure that the dirt is stably supported on the surface of the filter plate and will not fall into the fluid medium area due to water flow impact or vibration. Optionally, the second filter plate usually adopts reinforcing ribs, support frames, or special cross-sectional shapes to enhance its load-bearing capacity.

[0046] When the fluid medium passes through the filter pores, not only physical sieving occurs, but also adsorption and interception may occur, further removing tiny pollutants from the water. As the filtration time increases, the filter cake layer formed on the surface of the filter plate itself becomes a filter medium, which can intercept particles smaller than the filter pores, improving the filtration accuracy. Optionally, the final filtration effect is affected by a variety of factors, including filter pore characteristics, water flow velocity, operating pressure, and water temperature.

[0047] refer to Figure 6 In step S15, the drainage data of the sewage treatment device is collected, and the drainage change of the fluid medium is determined based on the drainage data. The self-cleaning mode of the sewage treatment device is triggered based on the drainage change of the fluid medium. At this time, the input of sewage is stopped in the self-cleaning mode, and the second filter plate, sewage reactants and the first filter plate are impacted by the fluid medium in the reverse direction until the drainage change of the fluid medium is less than the preset drainage change threshold. In the specific implementation of this invention, the specific steps are as follows: S151: Real-time monitoring of the wastewater treatment device and collection of the wastewater treatment device's discharge data; construction of a discharge data map of the fluid medium based on the wastewater treatment device's discharge data; determination of the fluid medium's discharge change based on the fluid medium's discharge data map. S152: Compare the change in the amount of drainage of the fluid medium with the preset threshold for the change in the amount of drainage. If the change in the amount of drainage is greater than the preset threshold for the change in the amount of drainage, the sewage treatment device is in a blocked state, and the blockage status of the first filter plate and the blockage status of the second filter plate are marked. S153: Based on the clogging status of the first filter plate, the clogging status of the second filter plate, and the change in the amount of fluid medium drainage, the self-cleaning mode of the sewage treatment device is determined. In the self-cleaning mode of the sewage treatment device, the corresponding self-cleaning method is triggered. At this time, the input of sewage is stopped, and the second filter plate, sewage reactants, and the first filter plate are impacted in reverse by the fluid medium to regulate the clogging status of the first filter plate and the second filter plate, thereby adjusting the change in the amount of fluid medium drainage so that the change in the amount of fluid medium drainage is less than the preset drainage change threshold.

[0048] In the embodiments of this application, the sewage treatment device is monitored in real time, and the drainage data of the sewage treatment device is collected. A discharge data map of the fluid medium is constructed based on the drainage data of the sewage treatment device. The drainage change of the fluid medium is determined according to the drainage data map of the fluid medium. The drainage data map of the fluid medium is introduced to accurately control the drainage change of the fluid medium.

[0049] At this time, the wastewater treatment unit is monitored in real time, and its discharge data is collected. The monitoring system adopts a distributed architecture, consisting of a field layer, a control layer, and a management layer. The field layer includes various sensors and actuators, the control layer consists of PLCs (Programmable Logic Controllers) and DCSs (Distributed Control Systems), and the management layer consists of SCADA (Supervisory Control and Data Acquisition System) and MES (Manufacturing Execution System). The sensor network covers key nodes of the wastewater treatment unit, including inlet, reaction chamber, filter plate, and outlet. The sensor types are diverse, including flow sensors, pressure sensors, turbidity sensors, pH sensors, COD sensors, and ammonia nitrogen sensors.

[0050] After receiving the drainage data, the central control system first performs data preprocessing, including data cleaning, outlier detection, data calibration, and data fusion. Data cleaning uses statistical methods and machine learning algorithms to identify and remove outliers. Data calibration ensures data accuracy through standard sample comparison and automatic calibration technology. Data fusion integrates data from multiple sources to extract useful information. The preprocessed data is stored in a real-time database in a time-series format. The database adopts a distributed architecture to support high-concurrency read / write and fast querying. Based on this data, the system constructs a drainage data map of the fluid medium. The system employs multi-dimensional visualization, including real-time curves, historical trend charts, bar charts, pie charts, and heatmaps. Real-time curves display the changing trends of drainage parameters over time, with the horizontal axis representing time and the vertical axis representing parameter values. Historical trend charts show long-term patterns and support zooming in and out over the time range. Bar charts and pie charts are used to display the proportion of different time periods or different parameters. Heatmaps are used to display the correlation between parameters. The data charts also support multi-parameter comparisons, such as the relationship between flow rate and pressure, or the relationship between turbidity and COD. The system also provides data annotation functionality, allowing users to mark special events, such as equipment start-up and shutdown, and abnormal situations.

[0051] Based on the discharge data of the fluid medium, the system analyzes the changing trends of drainage parameters using advanced algorithms to calculate the drainage change of the fluid medium. The drainage change includes multiple indicators, such as instantaneous rate of change, average rate of change, cumulative change, and trend coefficient. The instantaneous rate of change represents the change in parameters per unit time, calculated as ΔQ / Δt, where ΔQ is the parameter change and Δt is the time interval. The average rate of change represents the average rate of change within a specific time period. The cumulative change represents the total change within a specific time period. The trend coefficient is determined through linear regression or polynomial fitting methods, reflecting the overall trend of parameter changes. The system also employs sliding window technology to dynamically calculate changes at different time scales, such as 1-minute, 10-minute, and 1-hour changes, to capture the changing characteristics at different frequencies. The system also has alarm thresholds; when the change exceeds the threshold, an alarm mechanism is automatically triggered.

[0052] Furthermore, the change in the amount of drainage of the fluid medium is compared with a preset threshold for the change in the amount of drainage. If the change in the amount of drainage is greater than the preset threshold for the change in the amount of drainage, the wastewater treatment device is in a blocked state, and the blockage status of the first filter plate and the second filter plate are marked, thus introducing the blockage status of the first filter plate and the second filter plate.

[0053] At this time, the system will compare the real-time monitored and calculated drainage change with the preset threshold to determine whether the device is blocked. The drainage change usually includes a comprehensive evaluation of multiple indicators such as flow rate change rate, pressure change rate, and turbidity change rate. The preset threshold is determined based on the device's design parameters, historical operating data, and expert experience, and is usually divided into two levels: a warning threshold and an alarm threshold. The warning threshold is generally ±15% of the normal value, while the alarm threshold is ±25% of the normal value.

[0054] The comparison process employs a multi-level judgment logic, first judging individual indicators, and then judging comprehensive indicators. For example, when the flow rate change rate exceeds -20% and the pressure change rate exceeds +15%, the system determines it to be in a blocked state. The comparison algorithm uses a weighted average method, with the weight of each indicator determined according to its importance in the blockage judgment. The flow rate change rate has the highest weight, usually 0.4-0.5, the pressure change rate has a weight of 0.3-0.4, and the turbidity change rate has a weight of 0.2-0.3. The comparison results are divided into three levels: normal, warning, and alarm, corresponding to different handling measures.

[0055] When the change in drainage exceeds a preset threshold, the system automatically determines that the wastewater treatment device is blocked. The determination process uses a time-delay confirmation mechanism to avoid misjudgments caused by instantaneous fluctuations. Typically, an abnormal state is required to persist for 3-5 minutes before being confirmed as a blockage. Blockage is categorized into three levels: mild blockage, moderate blockage, and severe blockage, corresponding to different threshold ranges and treatment strategies. Mild blockage refers to a drainage change exceeding the warning threshold but not reaching the alarm threshold; moderate blockage refers to a drainage change exceeding the alarm threshold but not reaching the severe threshold; and severe blockage refers to a drainage change exceeding the severe threshold. The system automatically adjusts operating parameters based on the degree of blockage, such as increasing vibration frequency or adjusting reactant dosage, to alleviate the blockage. Simultaneously, the system records the time, severity, and duration of the blockage, providing data support for subsequent analysis and optimization.

[0056] The system analyzes data from various sensors to accurately identify and mark the clogging status of the first and second filter plates. The marking process employs a multi-parameter comprehensive analysis method, combining data such as flow distribution, pressure gradient, and vibration response to determine the degree and location of clogging for each filter plate. Clogging of the first filter plate is primarily determined by the pressure difference and flow rate change between the inlet and reaction chamber, while clogging of the second filter plate is determined by the pressure difference and flow rate change between the reaction chamber and outlet. The marking results include information such as clogging location, degree of clogging, and clogging type. The clogging location is accurate to a specific area of ​​the filter plate, such as the central area or edge area. The degree of clogging is expressed as a percentage, with 0% indicating no clogging and 100% indicating complete clogging. Clogging types are categorized as particulate matter clogging, biofilm clogging, and chemical precipitation clogging. The marking results are displayed graphically on the monitoring interface, with different colors representing different degrees of clogging, such as green for normal, yellow for mild clogging, orange for moderate clogging, and red for severe clogging.

[0057] Therefore, the self-cleaning mode of the wastewater treatment device is determined based on the clogging status of the first and second filter plates and the change in the amount of fluid medium drainage. In this self-cleaning mode, the corresponding self-cleaning method is triggered. At this time, the input of wastewater is stopped, and the fluid medium is used to reverse-impact the second filter plate, wastewater reactants, and the first filter plate to regulate the clogging status of the first and second filter plates, thereby adjusting the change in the amount of fluid medium drainage to ensure that the change in fluid medium drainage is less than a preset drainage change threshold, thus guaranteeing the discharge of the fluid medium. Simultaneously, the self-cleaning mode of the wastewater treatment device is introduced, and the fluid medium is used to reverse-impact along the same flow channel to self-clean the second filter plate, wastewater reactants, and the first filter plate, improving the clogging status of these components and ensuring the efficient discharge of the fluid medium.

[0058] At this point, the system employs a multi-parameter fusion decision algorithm, comprehensively considering three key indicators: the degree of clogging of the first filter plate, the degree of clogging of the second filter plate, and the change in drainage volume. Each indicator is quantified into a value from 0 to 100, where the degree of clogging represents the percentage of the clogging area relative to the total filtration area, and the change in drainage volume represents the percentage deviation of the current value from the normal value. The system presets four self-cleaning modes: light cleaning, medium cleaning, heavy cleaning, and special cleaning. Light cleaning is suitable for situations where the degree of clogging of the first filter plate is <30%, the degree of clogging of the second filter plate is <20%, and the change in drainage volume is <15%. Medium cleaning is suitable for situations where the degree of clogging of the first filter plate is 30%-60%, the degree of clogging of the second filter plate is 20%-40%, and the change in drainage volume is 15%-25%. Heavy cleaning is suitable for situations where the degree of clogging of the first filter plate is >60%, the degree of clogging of the second filter plate is >40%, and the change in drainage volume is >25%. Special cleaning is suitable for clogging caused by certain special pollutants, such as oil stains and biofilms. The decision algorithm uses fuzzy logic control to map the three input parameters to the four cleaning modes, ensuring that the cleaning method most suitable for the current situation is selected.

[0059] Each self-cleaning mode corresponds to a specific set of cleaning parameters and operating sequences. The light cleaning mode primarily uses fluid backwashing, with a backwashing pressure of 0.5-0.8 MPa, a flow rate of 10-15 m³ / h, and a duration of 5-8 minutes. The medium cleaning mode adds mechanical vibration to the fluid backwashing, with a vibration frequency of 30-50 Hz, an amplitude of 1-2 mm, and the backwashing pressure increased to 0.8-1.2 MPa, a flow rate of 15-20 m³ / h, and a duration of 8-12 minutes. The heavy cleaning mode further incorporates chemical cleaning... Wash by adding an appropriate amount of cleaning agent (such as 0.1%-0.2% citric acid or sodium hydroxide solution), increasing the backwash pressure to 1.2-1.5MPa, the flow rate to 20-25m³ / h, and the duration to 12-20 minutes; for special cleaning modes, select a special cleaning agent and special process parameters according to the specific type of contaminant; after the self-cleaning mode is triggered, the system automatically adjusts the valve status, closes the sewage input valve, opens the fluid medium input valve and the drain valve, starts the corresponding auxiliary equipment (such as vibrator, dosing pump, etc.), and executes the cleaning program according to the preset parameters.

[0060] The system first closes the wastewater inlet valve to stop new wastewater from entering the treatment unit. Simultaneously, it opens the fluid medium inlet valve and the drain valve to establish a backwash circuit. The fluid medium (usually from a treated fluid medium tank or an external fluid medium source) flows backward from the outlet of the unit at a set pressure and flow rate under the action of a pressurized pump, passing sequentially through the second filter plate, the reaction chamber, and the first filter plate. The reverse-flowing fluid medium impacts the filter media, effectively loosening and flushing away blockages. The pressure, flow rate, and duration of the backwash are precisely controlled according to the selected self-cleaning mode. For the second filter plate, the backwash primarily removes fine particles and biofilm from its surface. For the reaction chamber, the backwash helps redistribute wastewater reactants and removes sediment within the chamber. For the first filter plate, the backwash primarily removes large particles it has intercepted. Throughout the process, the system monitors parameters such as backwash pressure, flow rate, and turbidity in real time to ensure cleaning effectiveness and prevent over-washing.

[0061] The core objective of self-cleaning is to reduce the degree of clogging of the filter plates and restore normal drainage performance. The system dynamically adjusts the cleaning strategy by monitoring various parameters in real time during the cleaning process. For example, when a significant decrease in the turbidity of the backwash water is detected, it indicates that the blockage has been effectively removed, and the cleaning time can be appropriately shortened. When an abnormal increase in pressure is detected, it indicates that there may be stubborn blockage, and the cleaning parameters need to be adjusted or the cleaning time extended. After cleaning, the system reassesses the clogging status of the first and second filter plates and calculates the change in drainage. If the change in drainage has dropped below the preset threshold, self-cleaning is successful, and the system returns to normal operation. If the change in drainage is still higher than the threshold, the system will automatically select a higher-level cleaning mode or issue a maintenance alarm. The entire process forms a closed-loop control to ensure that the self-cleaning effect achieves the expected goal.

[0062] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A multi-stage filtration method for wastewater in a wastewater treatment device, characterized in that, include: Wastewater enters the wastewater treatment device through the wastewater inlet and undergoes primary filtration in the first filter plate, where multiple first particles are separated from the wastewater. After primary filtration, the wastewater converges towards the reaction chamber of the wastewater treatment device and comes into contact with the wastewater reactants in the reaction chamber. At this time, the wastewater undergoes a chemical reaction with the wastewater reactants in the reaction chamber, and the wastewater after primary filtration is subjected to secondary filtration to form corresponding fouling. The vibration module in the reaction chamber vibrates the wastewater reactants to adjust the reaction efficiency of the wastewater reactants on the wastewater and the gap between multiple adjacent wastewater reactants, realizing a wastewater reaction mode in which the wastewater after primary filtration is vibrated and reacted simultaneously, and outputting a fluid medium. The fluid medium output from the reaction chamber undergoes final filtration in the second filter plate, where dirt is separated and stored in the reaction chamber and the second filter plate. The wastewater treatment device collects drainage data, determines the amount of drainage change of the fluid medium based on the drainage data, and triggers the self-cleaning mode of the wastewater treatment device based on the amount of drainage change of the fluid medium. At this time, the input of wastewater is stopped in the self-cleaning mode, and the fluid medium is used to reverse-impact the second filter plate, wastewater reactants and the first filter plate until the amount of drainage change of the fluid medium is less than the preset drainage change threshold.

2. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 1, characterized in that, The wastewater enters the wastewater treatment device through the wastewater inlet and undergoes primary filtration in the first filter plate. During primary filtration, the wastewater is separated into multiple first particles, including: The top of the wastewater treatment device is provided with a wastewater inlet. Wastewater enters the internal space of the wastewater treatment device from the wastewater inlet and flows along the drainage channel of the wastewater inlet-first filter plate, and enters multiple first filter holes of the first filter plate; the multiple first filter holes are arranged in an array along a ring direction on the first filter plate. Wastewater undergoes primary filtration through multiple first filter holes, separating multiple first particles. These particles cannot penetrate the multiple first filter holes and are confined by the first filter plate.

3. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 1, characterized in that, The wastewater, after primary filtration, converges towards the reaction chamber of the wastewater treatment device and comes into contact with the wastewater reactants in the reaction chamber. At this point, the wastewater undergoes a chemical reaction with the wastewater reactants in the reaction chamber, and the primary filtration process is followed by secondary filtration to form corresponding fouling, including: A drainage channel for the first filter plate and the reaction chamber of the wastewater treatment device is formed between the first filter plate and the reaction chamber. Wastewater that has undergone primary filtration by the first filter plate flows along the drainage channel for the first filter plate and the reaction chamber. A sub-converging channel is formed in the drainage channel of the first filter plate-reaction chamber. The sewage after primary filtration by the first filter plate converges under the guidance of the sub-converging channel and flows toward the reaction chamber.

4. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 3, characterized in that, The wastewater after primary filtration converges towards the reaction chamber of the wastewater treatment device, where it comes into contact with the wastewater reactants. At this point, the wastewater undergoes a chemical reaction with the wastewater reactants in the reaction chamber, and the primary filtration process is followed by secondary filtration to form corresponding fouling. The treatment also includes: The reaction chamber contains multiple wastewater reactants arranged sequentially along a ring direction and stacked sequentially along a vertical direction. At this time, the wastewater after primary filtration by the first filter plate enters the reaction chamber and undergoes a chemical reaction with the multiple wastewater reactants to output the corresponding fluid medium. At the same time, the wastewater after primary filtration undergoes secondary filtration to form the corresponding dirt.

5. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 1, characterized in that, The vibration module located in the reaction chamber vibrates the wastewater reactants to adjust the reaction efficiency of the wastewater reactants with the wastewater and the gaps between adjacent wastewater reactants, realizing a wastewater reaction mode in which the primary filtered wastewater reacts simultaneously with vibration, and outputs a fluid medium, including: The reaction chamber is equipped with a vibration module located in the middle of the reaction chamber. The vibration module performs circular vibration on the wastewater reactants in the reaction chamber to realize the vibration mode of the wastewater reactants. The wastewater reactants adjust their corresponding gaps under vibration, achieving a full reaction of the wastewater. After primary filtration, the wastewater undergoes a reaction mode of vibration and reaction in the reaction chamber, so as to output the fluid medium at the outlet of the reaction chamber.

6. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 2, characterized in that, The fluid medium output from the reaction chamber undergoes final filtration in the second filter plate, during which dirt is separated and stored in the reaction chamber and the second filter plate, including: A drainage channel for the reaction chamber and the second filter plate is formed between the reaction chamber and the second filter plate. The fluid medium discharged from the reaction chamber flows along the drainage channel for the reaction chamber and the second filter plate and gradually approaches the second filter plate.

7. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 6, characterized in that, The fluid medium output from the reaction chamber undergoes final filtration in the second filter plate, during which dirt is separated and stored in the reaction chamber and the second filter plate. The process also includes: The second filter plate is provided with multiple second filter holes, the diameter of which is smaller than that of the first filter hole. The multiple second filter holes allow the fluid medium to pass through and block the dirt discharged from the reaction chamber from passing through. At this time, the second filter plate supports the dirt discharged from the reaction chamber and restricts the further downward flow of the dirt discharged from the reaction chamber. Meanwhile, the fluid medium undergoes final filtration in the second filter plate.

8. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 1, characterized in that, The wastewater treatment device collects drainage data, determines the change in the amount of fluid medium discharged based on this data, and triggers a self-cleaning mode based on the change in the amount of fluid medium discharged. In this mode, wastewater input is stopped, and the fluid medium reverse-impacts the second filter plate, wastewater reactants, and the first filter plate until the change in the amount of fluid medium discharged is less than a preset threshold. This includes: The wastewater treatment device is monitored in real time, and its drainage data is collected. Based on the drainage data, a discharge data map of the fluid medium is constructed, and the change in the drainage of the fluid medium is determined according to the discharge data map.

9. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 8, characterized in that, The process involves collecting drainage data from the wastewater treatment device, determining the change in the amount of drainage fluid in the fluid medium, and triggering a self-cleaning mode for the wastewater treatment device based on this change. In this mode, wastewater input is stopped, and the fluid medium is used to reverse-impact the second filter plate, wastewater reactants, and the first filter plate until the change in the amount of drainage fluid is less than a preset threshold. The process also includes: The amount of change in the drainage of the fluid medium is compared with a preset threshold for the amount of change in drainage. If the amount of change in drainage is greater than the preset threshold, the wastewater treatment device is in a blocked state, and the blockage status of the first filter plate and the blockage status of the second filter plate are marked.

10. The multi-stage filtration method for wastewater in the wastewater treatment device according to claim 9, characterized in that, The process involves collecting drainage data from the wastewater treatment device, determining the change in the amount of drainage fluid in the fluid medium, and triggering a self-cleaning mode for the wastewater treatment device based on this change. In this mode, wastewater input is stopped, and the fluid medium is used to reverse-impact the second filter plate, wastewater reactants, and the first filter plate until the change in the amount of drainage fluid is less than a preset threshold. The process also includes: The self-cleaning mode of the wastewater treatment device is determined based on the clogging status of the first filter plate, the clogging status of the second filter plate, and the change in the amount of fluid medium drainage. In the self-cleaning mode of the wastewater treatment device, the corresponding self-cleaning method is triggered. At this time, the input of wastewater is stopped, and the second filter plate, wastewater reactants, and the first filter plate are impacted by the fluid medium in the reverse direction to regulate the clogging status of the first and second filter plates, thereby adjusting the change in the amount of fluid medium drainage so that the change in the amount of fluid medium drainage is less than the preset drainage change threshold.

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