Filtering method and system integrating ultrasonic cleaning and branch off-line backwashing

Abstract

The invention discloses an ultrasonic cleaning and branch off-line backwashing integrated filtering method and system, and belongs to the technical field of solid-liquid separation and filtration, the system comprises a water pool / box, a filtering unit, a pipeline assembly, a valve, a water pump and an ultrasonic cleaning device, the filtering unit adopts a single-machine structure, and matrix arrangement of filtering elements is realized through a multi-way pipe; the multi-way pipe has the functions of purified water confluence and backwashing water distribution. The method comprises three stages of filtering, back washing by lines and ultrasonic cleaning, wherein sewage purification and reuse are realized in the filtering stage; in the row-by-row backwashing, purified water is intercepted through a flow regulating valve, and filtering elements are cleaned row by row without shutdown; the ultrasonic generator and the vibration plate are arranged separately, and stubborn scale on the filter element arranged in situ is removed. The device combines double cleaning mechanisms, is thorough in cleaning, guarantees continuous and stable operation of the system, simplifies the structure, reduces the cost, prolongs the service life of equipment, is green and environment-friendly, and is suitable for various sewage purification scenes.

Description

Technical Field

[0001] This invention belongs to the field of solid-liquid separation technology, specifically relating to a filtration method and system that integrates ultrasonic cleaning and offline backwashing. Background Technology

[0002] During the production processes and equipment operation of industrial and mining enterprises, a large amount of wastewater or sewage with varying degrees of pollution is generated. In order to meet the needs of environmental protection and water conservation, this type of wastewater and sewage needs to be purified. Among these, filtration technology has become one of the most widely used purification technologies because it can separate solids and liquids by intercepting suspended solids and particulate matter in the water through a medium.

[0003] Currently, mainstream filtration technologies include biofilters, screen filters, and membrane filtration. However, all these filtration methods face a common problem during long-term operation: particulate matter continuously accumulates on the surface of the filter elements, leading to a continuous decrease in filtration flux. Therefore, backwashing is necessary to restore filtration performance. Existing backwashing technologies for filtration systems have significant drawbacks. Most filters require the entire system to be shut down for offline backwashing, severely impacting production continuity. Even with compartmentalized cleaning solutions, some technologies still suffer from poor cleaning results and require backwash water tanks and dedicated backwash water pumps. Frequent start-ups and shutdowns of the backwash water pumps can also cause significant stress on the system.

[0004] Furthermore, after prolonged operation, calcium and magnesium ions in the water easily form stubborn scale on the surface of the filter elements, which is difficult to remove completely by simple backwashing and usually requires chemical soaking. This method not only leads to chemical residues polluting the water but also interrupts continuous system operation, further reducing treatment efficiency. Although ultrasonic cleaning technology has been used to clean dirt from mechanical parts, traditional ultrasonic cleaning requires disassembling and immersing the parts to be cleaned in a dedicated water tank. For filtration systems with a large number of filter elements, this method is not only labor-intensive to disassemble and assemble but also prone to damaging the filter elements, failing to meet the high-efficiency operation requirements of the filtration system. Summary of the Invention

[0005] To address these issues, this invention provides a filtration method and system that integrates ultrasonic cleaning and offline backwashing, solving problems such as insufficient backwashing intensity and poor cleaning effect in filtration systems; backwashing requiring specialized equipment and the impact of starting and stopping the backwashing equipment on the system; scale removal requiring chemical cleaning leaving residues and interrupting operation; and traditional ultrasonic scale cleaning requiring component disassembly and reassembly, resulting in a large workload and easy damage.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a filtration method integrating ultrasonic cleaning and offline backwashing, comprising the following steps: filtration stage: opening the flow regulating valve and all clean water outlet valves, closing all backwash inlet valves, and after the sewage enters the water tank / box through the sewage inlet pipe, it is filtered by the filtration unit and then discharged or reused through the clean water branch pipe, the clean water main pipe, the water pump inlet pipe, the water pump outlet pipe and the clean water discharge / reuse pipe; Backwashing stage: Adjust the flow regulating valve to reduce the opening, so that some clean water enters the backwash main pipe through the backwash connection pipe. Open the backwash inlet valve of the target row and close the corresponding clean water outlet valve of the target row to backwash the filter element of the target row. After completion, close the backwash inlet valve of the target row and open the clean water outlet valve of the target row. Ultrasonic cleaning stage: Depending on the degree of scaling on the filter element, the ultrasonic generator is started at regular intervals to clean the filter element in situ through the ultrasonic transducer.

[0007] As a preferred solution for a filtration method that integrates ultrasonic cleaning and offline backwashing, the backwashing stage involves backwashing one or two rows of filter elements at a time, while the remaining filter elements continue to perform filtration during the backwashing process.

[0008] As a preferred solution for a filtration method that integrates ultrasonic cleaning and offline backwashing, the cleaning duration and interval of the ultrasonic cleaning stage are preset by the program and staggered in time from the offline backwashing stage.

[0009] As a preferred embodiment of the filtration method integrating ultrasonic cleaning and offline backwashing, the backwash water volume during the offline backwashing stage is adjusted by the flow regulating valve to maintain the preset pressure and flow rate of the backwash water.

[0010] The present invention also provides a filtration system integrating ultrasonic cleaning and separate offline backwashing, for use in the above-mentioned filtration method integrating ultrasonic cleaning and separate offline backwashing, including a sewage inlet pipe, a water tank / box, a filtration unit, a clean water discharge / reuse pipe, a clean water main pipe, clean water branch pipes, a clean water outlet valve, a backwash main pipe, backwash branch pipes, a backwash inlet valve, a water pump, a water pump inlet pipe, a water pump outlet pipe, and an ultrasonic cleaning device; The sewage inlet pipe is connected to the water tank / compartment; One end of the water pump inlet pipe is connected to the main purified water pipe, and the other end of the water pump inlet pipe is connected to the inlet of the water pump; one end of the water pump outlet pipe is connected to the outlet of the water pump, and the other end of the water pump outlet pipe is fixedly connected to the backwash connection pipe and the purified water discharge / reuse pipe respectively through a tee. The end of the backwash connection pipe away from the water pump outlet pipe is connected to the backwash main pipe. The backwash main pipe is connected to a number of backwash branch pipes in a corresponding manner. Each backwash branch pipe is equipped with a backwash inlet valve. A flow regulating valve is fixedly arranged on the purified water discharge / reuse pipe, and the purified water main pipe is connected to several purified water branch pipes. Each purified water branch pipe is equipped with a purified water outlet valve. The filtration unit is connected between the backwash branch pipe and the purified water branch pipe; The ultrasonic cleaning device is used to perform in-situ ultrasonic cleaning of the filter elements of the filter unit.

[0011] As a preferred embodiment of the filtration system integrating ultrasonic cleaning and offline backwashing, the filtration unit is a single-unit structure, which includes a multi-port pipe, connectors, filter elements, and mounting brackets; one or more of the multi-port pipes are arranged in rows at predetermined intervals on the mounting brackets to form the flow channels of the filtration unit. The main pipe of the multi-port pipe is connected to the backwash branch pipe and the purified water branch pipe at both ends. One or more branch pipes spaced at a set distance are arranged in the middle of the main pipe of the multi-port pipe. Each branch pipe is connected to a filter element through the connector. Through the row arrangement of the multi-port pipe and the column connection of the branch pipes, the filter elements are arranged in a matrix in the horizontal direction.

[0012] As a preferred embodiment of a filtration system integrating ultrasonic cleaning and offline backwashing, the ultrasonic cleaning device includes an ultrasonic generator and an ultrasonic transducer plate. The ultrasonic generator and the ultrasonic transducer plate are connected by a cable. The ultrasonic generator is installed on the outside of the water tank / box, and the ultrasonic transducer plate is fixed on the mounting bracket and maintains a set distance from the filter element. The ultrasonic transducer plate is located on the left and right sides or around the filter element.

[0013] As a preferred solution for a filtration system integrating ultrasonic cleaning and offline backwashing, the filtration unit is completely submerged in the water tank / box, and a sludge storage space of a set height is reserved between the filtration unit and the bottom of the water tank / box. The water tank / box is equipped with a sludge pump, which is used to pump the sludge to the filter press.

[0014] As a preferred solution for a filtration system integrating ultrasonic cleaning and offline backwashing, the filter element is a tubular or hollow plate structure with a non-soft surface. The filter element material is selected from one or more of stainless steel, composite materials, and ceramics. The filter element is connected to the multi-port pipe by threaded connection, clamp sleeve connection, or union connection.

[0015] As a preferred solution for a filtration system integrating ultrasonic cleaning and offline backwashing, the mounting bracket is an open box or frame structure with a square or rectangular cross-section. The bottom of the mounting bracket is equipped with a filter element support, and the four sides of the mounting bracket are perforated plates.

[0016] This invention has the following advantages: First, in the row-by-row offline backwashing mode, only one or two rows of filter elements are cleaned at a time, while the remaining rows of filter elements remain in normal filtration state. This completely avoids the problem of needing to shut down the system for traditional backwashing, ensuring uninterrupted wastewater purification operations and significantly improving overall treatment efficiency. Ultrasonic cleaning uses an in-situ operation method, eliminating the need to disassemble or reassemble filter elements. During the cleaning process, the filter units continue to perform their filtration function, and the cleaning duration and interval can be preset by the program to stagger the backwashing phase, further ensuring the continuity and stability of the system operation.

[0017] Secondly, during row-by-row backwashing, the pressure and flow rate of the backwash water are controlled by a flow regulating valve. The concentrated water flow impact effectively removes suspended solids, deposits, and other impurities from the surface of the filter elements. The cavitation effect generated by the ultrasonic transducer can deeply peel away stubborn scale and deep particles from the surface and interior of the filter elements, solving the problem of traditional backwashing's inability to remove scale. The filter elements are arranged in a matrix, with the ultrasonic transducer surrounding both sides or all around the filter elements, ensuring uniform ultrasonic energy coverage and eliminating cleaning dead zones. The row-by-row, sequential backwashing method ensures that each row of filter elements receives sufficient washing intensity, avoiding the incomplete cleaning problems associated with compartment cleaning, and maintaining high filtration flux and separation accuracy of the filter elements over the long term.

[0018] Third, by using a flow regulating valve to intercept a portion of the purified water as backwash water, there is no need for additional backwash water pumps, backwash water tanks, and level gauges, reducing the number of equipment and piping complexity, and lowering system manufacturing costs and floor space. The backwash water is directly taken from the purified water already in the system, eliminating the need for a separate backwash water source and saving water resources. The flow regulating valve can adjust the backwash water volume and pressure as needed, avoiding water waste and reducing energy consumption during the backwash process, thus lowering long-term operating costs. The filter unit adopts a single-unit integrated structure, with multiple pipes arranged in rows to form a regular flow channel. The filter elements and multiple pipes are flexibly connected via threads, clamps, etc., making installation convenient. Individual filter elements can be disassembled and replaced for subsequent maintenance without requiring a complete shutdown for repair, reducing maintenance difficulty and downtime losses. The filter elements are cleaned in situ throughout the process, eliminating the need for frequent disassembly and relocation, effectively avoiding damage such as bumps and wear caused by disassembly in traditional ultrasonic cleaning, and significantly extending the service life of the filter elements.

[0019] Fourth, the multi-port pipe combines the dual functions of purified water collection and backwash water distribution, with functional switching achieved through valve switching. Its compact and reliable structure reduces pipe connection points and lowers the risk of leakage. The open-structure mounting bracket facilitates sludge removal and cleaning, preventing corrosion and damage caused by sludge accumulation and enhancing the overall durability of the filtration unit. Physical cleaning is employed, using the impact of backwash water flow and ultrasonic cavitation to remove impurities without the need for chemical soaking. This avoids water pollution from chemical residues and reduces the additional costs associated with chemical procurement and disposal, aligning with environmental policies. The filtration unit is submerged in a water tank. Sludge generated from backwashing and ultrasonic cleaning is centrally deposited in a pre-designed storage space at the bottom of the tank. A sludge pump periodically pumps it to a filter press or other solid-liquid separation device, achieving centralized sludge treatment and resource utilization, reducing secondary pollution, and improving the overall environmental benefits of wastewater purification. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0022] Figure 1 This is a schematic diagram of a filtration system integrating ultrasonic cleaning and separate offline backwashing, provided in an embodiment of the present invention.

[0023] Figure 2 This is a front view of a single-unit filter unit of the ultrasonic cleaning and offline backwashing integrated filtration system provided in an embodiment of the present invention.

[0024] Figure 3 The left view of a single-unit filter unit of the ultrasonic cleaning and offline backwashing integrated filtration system provided in an embodiment of the present invention.

[0025] Figure 4 This is a top view of a single-unit filter unit of the ultrasonic cleaning and offline backwashing integrated filtration system provided in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of a multi-port pipe for an integrated ultrasonic cleaning and offline backwashing filtration system provided in an embodiment of the present invention.

[0027] Figure 6 The process flow diagram is provided for the ultrasonic cleaning and offline backwashing integrated filtration system according to an embodiment of the present invention.

[0028] In the diagram, 1. Wastewater inlet pipe; 2. Water tank / compartment; 3. Backwash branch pipe; 4. Backwash inlet valve; 5. Backwash main pipe; 6. Filter unit; 7. Backwash connection pipe; 8. Clean water outlet valve; 9. Clean water main pipe; 10. Clean water branch pipe; 11. Water pump inlet pipe; 12. Water pump outlet pipe; 13. Flow regulating valve; 14. Clean water discharge / reuse pipe; 15. Water pump; 16. Ultrasonic generator; 17. Slurry pump; 501. Multi-port pipe; 502. Connector; 503. Filter element; 504. Mounting bracket; 505. Ultrasonic vibrating plate. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] See Figure 1This invention also provides a filtration system integrating ultrasonic cleaning and offline backwashing, comprising a wastewater inlet pipe 1, a water tank / box 2, a filtration unit 6, a purified water discharge / reuse pipe 14, a purified water main pipe 9, purified water branch pipes 10, a purified water outlet valve 8, a backwash main pipe 5, a backwash branch pipe 3, a backwash inlet valve 4, a water pump 15, a water pump inlet pipe 11, a water pump outlet pipe 12, and an ultrasonic cleaning device; the wastewater inlet pipe 1 connects to the water tank / box 2; one end of the water pump inlet pipe 11 is connected to the purified water main pipe 9, and the other end of the water pump inlet pipe 11 is connected to the inlet of the water pump 15; one end of the water pump outlet pipe 12 is connected to the outlet of the water pump 15, and the other end of the water pump outlet pipe 12 is connected to the outlet of the water pump 15. The end is fixedly connected to the backwash connection pipe 7 and the clean water discharge / reuse pipe 14 via a tee; the end of the backwash connection pipe 7 away from the water pump outlet pipe 12 is connected to the backwash main pipe 5, and the backwash main pipe 5 is connected to several backwash branch pipes 3 one by one, and each backwash branch pipe 3 is equipped with a backwash inlet valve 4; a flow regulating valve 13 is fixedly arranged on the clean water discharge / reuse pipe 14, and the clean water main pipe 9 is connected to several clean water branch pipes 10, and each clean water branch pipe 10 is equipped with a clean water outlet valve 8; the filter unit 6 is connected between the backwash branch pipe 3 and the clean water branch pipe 10; the ultrasonic cleaning device is used to perform in-situ ultrasonic cleaning of the filter element 503 of the filter unit 6.

[0031] Specifically, the wastewater inlet pipe 1 provides an input channel for polluted water, ensuring that the water flows directionally into the pool / tank 2 for buffering and pretreatment. The water pump 15, as the power core, draws filtered clean water from the main purified water pipe 9 through the pump inlet pipe 11 and delivers it to subsequent pipelines via the pump outlet pipe 12. The three-way structure enables water flow diversion, allowing purified water to simultaneously meet the dual needs of discharge / reuse and backwashing without requiring an additional power source. The backwash main pipe 5 and backwash branch pipes 3 form a tiered water supply network. The backwash inlet valve 4 controls the on / off state of each backwash water flow, ensuring that the backwash water reaches the target filter element 503. The purified water outlet valve 8 and the backwash inlet valve 4 form an interlocked control logic to avoid conflicts between filtration and backwash water flows. The flow regulating valve 13 controls the backwash water pressure and flow rate. By changing the valve opening, it intercepts a portion of the purified water, utilizing the system's own water pressure to generate backwash power, eliminating the need for an additional backwash pump 15, simplifying the system structure while ensuring backwash intensity. The filter unit 6 is connected between the backwash branch pipe 3 and the clean water branch pipe 10, and can switch between receiving sewage for filtration or receiving backwash water for cleaning; the ultrasonic cleaning device is deployed independently to achieve in-situ cleaning function without interfering with the normal operation of the filter channel.

[0032] See Figure 2 , Figure 3 , Figure 4 and Figure 5In this embodiment, the filter unit 6 is a single-unit structure. The filter unit 6 includes a multi-port pipe 501, a connector 502, a filter element 503, and a mounting bracket 504. One or more multi-port pipes 501 are arranged in rows on the mounting bracket 504 at a set distance to form the flow channel of the filter unit 6. The two ends of the main pipe of the multi-port pipe 501 are respectively connected to the backwash branch pipe 3 and the clean water branch pipe 10. One or more branch pipes at a set distance are arranged in the middle of the main pipe of the multi-port pipe 501. Each branch pipe is connected to a filter element 503 through the connector 502. Through the row arrangement of the multi-port pipes 501 and the column connection of the branch pipes, the filter elements 503 are arranged in a matrix in the horizontal direction.

[0033] Specifically, the filter unit 6 adopts a single-unit integrated design, combining the flow channel, filter element 503, and support structure into a single unit, facilitating installation, maintenance, and replacement, and reducing system integration complexity. The mounting bracket 504 provides stable support for the multi-port pipe 501 and filter element 503, while ensuring uniform spacing between components to guarantee balanced distribution of water flow and ultrasonic energy. The main pipe connects to the backwash branch pipe 3 and the purified water branch pipe 10 at both ends, enabling switching between the two water flow inputs; the middle branch pipes are arranged at set intervals, allowing each filter element 503 to independently receive water flow, avoiding mutual interference. The connector 502 features a detachable design, ensuring a sealed connection between the filter element 503 and the multi-port pipe 501 to prevent leakage, while also facilitating the inspection and replacement of individual filter elements 503 without requiring complete disassembly of the filter unit 6, thus reducing maintenance costs. The matrix arrangement of filter elements 503 maximizes the filtration area and improves the processing efficiency per unit space. At the same time, the matrix structure provides a basis for row-by-row backwashing. Each row of filter elements 503 can be independently controlled by a corresponding multi-port pipe 501 and valve to achieve a row-by-row cleaning and other filtration operation mode.

[0034] In one possible embodiment, the ultrasonic cleaning device includes an ultrasonic generator 16 and an ultrasonic transducer 505. The ultrasonic generator 16 and the ultrasonic transducer 505 are connected by a cable. The ultrasonic generator 16 is installed on the outside of the water tank / box 2. The ultrasonic transducer 505 is fixed on the mounting bracket 504 and maintains a set distance from the filter element 503. The ultrasonic transducer 505 is located on the left and right sides or around the filter element 503.

[0035] Specifically, the ultrasonic cleaning device adopts a split design. The ultrasonic generator 16, as the energy generation core, is installed on the outside of the water tank / box 2 to avoid damage to electrical components caused by the humid environment, extend the service life of the equipment, and facilitate maintenance and debugging. The ultrasonic transducer 505 receives the high-frequency electrical signal transmitted by the generator through a cable, converts it into mechanical vibration, and transmits it to the water. It utilizes the ultrasonic cavitation effect to generate microbubbles. The impact force released when the bubbles burst can peel off stubborn scale and deep particles from the surface and inside of the filter element 503, making up for the inadequacy of backwashing, which can only remove surface impurities.

[0036] The ultrasonic transducer 505 is fixed on the mounting bracket 504 and maintains a set distance from the filter element 503. This ensures efficient transmission of vibration energy to the surface of the filter element 503 while avoiding physical wear caused by direct contact between the ultrasonic transducer 505 and the filter element 503. The surrounding arrangement of the ultrasonic transducer 505 ensures that the ultrasonic energy covers all areas without dead zones, and all filter elements 503 can achieve a uniform cleaning effect. The separate structure allows for independent control of ultrasonic cleaning, eliminating the need for synchronous operation with the filter unit 6. It can be started at set times according to the scaling condition, ensuring cleaning effectiveness while avoiding energy waste.

[0037] In one possible embodiment, the filter unit 6 is completely submerged in the pool / tank 2, and the filter unit 6 is provided with a sludge storage space at a set height from the bottom of the pool / tank 2. The pool / tank 2 is equipped with a sludge pump 17, which is used to pump the sludge to the filter press.

[0038] Specifically, the filter unit 6 is completely submerged in the water, ensuring full contact between the wastewater and the filter element 503, guaranteeing a continuous and stable filtration process. It also provides the necessary water medium for ultrasonic cleaning, eliminating the need for an additional cleaning tank. A set height of sludge storage space is maintained at the bottom of the filter unit 6 and the tank to accommodate sludge and impurities removed during backwashing and ultrasonic cleaning, preventing sludge buildup at the bottom of the filter element 503 from obstructing water flow and ensuring uninterrupted filtration and cleaning. The sludge pump 17, acting as a sludge discharge component, periodically pumps the sludge deposited at the bottom of the tank to the filter press, achieving centralized sludge collection and solid-liquid separation. This avoids secondary pollution of the water body by sludge and facilitates subsequent sludge disposal and resource utilization, meeting environmental protection requirements. The submerged design, in conjunction with the centralized sludge discharge system, reduces sludge residue within the system, lowers the risk of equipment corrosion, and extends the service life of the filter unit 6 and the tank / compartment 2.

[0039] In one possible embodiment, the filter element 503 is a tubular or hollow plate structure with a non-soft surface. The material of the filter element 503 is selected from one or more of stainless steel, composite materials, and ceramics. The filter element 503 is connected to the multi-port pipe 501 by threaded connection, clamp sleeve connection, or union connection.

[0040] Specifically, the 503 filter element employs a non-soft surface structure, possessing high mechanical strength and stability. It can withstand the impact of backwash water flow and ultrasonic vibrations, preventing deformation or damage and ensuring long-term operational reliability. Stainless steel offers excellent corrosion resistance and strength, composite materials balance lightweight design with filtration efficiency, and ceramic materials provide high filtration precision and high temperature resistance, allowing for flexible adaptation to different wastewater conditions and expanding the system's application range. Connection methods include threads, clamp sleeves, or unions, all mature sealing connection structures. Threaded connections offer strong sealing, clamp sleeve connections are easy to install, and union connections facilitate quick disassembly, meeting diverse installation scenarios and maintenance needs while ensuring leak-free connections and directional water flow.

[0041] In one possible embodiment, the mounting bracket 504 is an open box or frame structure with a square or rectangular cross-section. The bottom of the mounting bracket 504 is provided with a filter element 503 support, and the four sides of the mounting bracket 504 are perforated plates.

[0042] Specifically, the mounting bracket 504 adopts a square or rectangular cross-section design, which provides strong structural stability and uniform support for components such as the multi-channel pipe 501, filter element 503, and ultrasonic transducer plate 505. This prevents component displacement due to vibration during operation, ensures the relative positions of each component are fixed, and guarantees stable water flow and ultrasonic transmission paths. The open structure allows the sludge removed during cleaning to fall directly into the storage space at the bottom of the tank, preventing sludge accumulation inside the bracket and reducing cleaning dead zones. The bottom filter element 503 support only provides necessary support for the filter element 503 and does not obstruct the sludge falling channel, ensuring smooth sludge discharge. The four sides use perforated panels. The perforated design allows water to freely enter and exit the filter unit 6 without affecting the flow of filtration and backwash water, while also providing protection to prevent external debris from colliding with the filter element 503. It also has a decorative effect, making the overall structure more regular.

[0043] See Figure 6 This invention provides a filtration method integrating ultrasonic cleaning and offline backwashing, comprising the following steps: Filtration stage: Open the flow regulating valve 13 and all clean water outlet valves 8, close all backwash inlet valves 4, and after the sewage enters the water tank / box 2 through the sewage inlet pipe 1, it is filtered by the filtration unit 6 and then discharged or reused through the clean water branch pipe 10, the clean water main pipe 9, the water pump inlet pipe 11, the water pump outlet pipe 12 and the clean water discharge / reuse pipe 14.

[0044] In the filtration stage, a unidirectional filtration channel is constructed through valve state combinations to ensure that wastewater can only be purified by passing through filter element 503, without water diversion or backflow. After the wastewater enters the pool / tank 2, a buffer is formed, which makes the wastewater evenly distributed to the filter unit 6, avoiding uneven load on filter element 503 caused by excessively fast local water flow; Filter element 503 intercepts suspended solids, particulate matter, and other impurities in the wastewater. The purified water flows through branch pipe 501 to purified water branch pipe 10, and then through purified water main pipe 9 to water pump 15. Finally, it is discharged / reused through the discharge / reuse pipe for resource utilization or discharge in compliance with standards. When the flow regulating valve 13 is fully open, the system's purified water discharge is at its maximum, meeting the treatment requirements under normal filtration conditions. At the same time, water pump 15 provides stable power to ensure that the water flow velocity and filtration pressure are balanced, maintaining a stable filtration flux.

[0045] In the row-specific backwashing stage: The flow regulating valve 13 is adjusted to reduce its opening, allowing some purified water to enter the backwash main pipe 5 via the backwash connection pipe 7. The backwash inlet valve 4 of the target row is opened, and the corresponding purified water outlet valve 8 of the target row is closed, backwashing the filter element 503 of the target row. After completion, the backwash inlet valve 4 of the target row is closed, and the purified water outlet valve 8 of the target row is opened. When the flow regulating valve 13 is reduced, the purified water discharge path is blocked. Part of the purified water, under system pressure, is diverted to the backwash connection pipe 7 via a three-way valve, forming a backwash water flow without the need for an additional backwash pump. The system's own water pressure ensures the backwash pressure, simplifying the power structure. By individually controlling the backwash inlet valve 4 and purified water outlet valve 8 of the target row, the backwash water flows only to the filter element 503 of the target row, while the valves of the other rows remain in filtration mode. This achieves offline cleaning of one row while the rest continue normal filtration, ensuring continuous system operation. The backwash water flows in the opposite direction to flush the surface of the filter element 503, stripping away the deposited suspended solids and particulate matter and carrying them into the sludge storage space at the bottom of the tank. After cleaning, the target valve is restored to its original state and put back into filtration, ensuring that the overall treatment efficiency of the system is not affected.

[0046] Ultrasonic Cleaning Stage: Based on the degree of scaling on filter element 503, ultrasonic generator 16 is activated periodically to perform in-situ cleaning of filter element 503 via ultrasonic transducer 505. During the cleaning process, filter unit 6 maintains normal filtration. Ultrasonic cleaning targets stubborn scale that is difficult to remove through backwashing, such as calcium and magnesium ion crystals. It utilizes the microscopic impact force generated by ultrasonic cavitation to penetrate deep into the surface and pores of filter element 503, removing deep-seated dirt and achieving thorough cleaning, restoring the flux of filter element 503. The cleaning timing is set according to the degree of scaling, and the cleaning duration and interval are preset through a program to avoid indiscriminate cleaning and energy waste. Meanwhile, ultrasonic cleaning and backwashing are staggered in time to avoid interference between the two cleaning methods, ensuring that a sufficient number of elements in filter unit 6 are always working normally and maintaining stable system processing capacity. In-situ cleaning eliminates the need to disassemble filter element 503, avoiding damage and efficiency loss during disassembly and assembly. At the same time, filter unit 6 continues to operate during the cleaning process, ensuring uninterrupted wastewater purification and continuous treatment.

[0047] In one possible embodiment, during the row backwashing stage, one or two rows of filter elements 503 are backwashed at a time, while the remaining filter elements 503 continue to perform filtration during the backwashing process.

[0048] Specifically, cleaning only one or two rows of filter elements 503 at a time controls backwash water consumption, ensures concentrated backwash water pressure, and improves cleaning intensity and effectiveness. If too many rows are cleaned simultaneously, the backwash water will be diverted, resulting in insufficient pressure and incomplete cleaning. The remaining filter elements 503 continue filtration, ensuring that the total filtration area of ​​the system still meets the wastewater treatment requirements, avoiding a significant drop in treatment efficiency due to backwashing, and achieving parallel cleaning and filtration, balancing cleaning effectiveness and treatment continuity.

[0049] In one possible embodiment, the cleaning duration and interval of the ultrasonic cleaning stage are preset by the program and are staggered in time from the row backwashing stage.

[0050] Specifically, the preset cleaning time can be adjusted according to the material of the filter element 503, the quality of the wastewater, and other operating conditions. This ensures that while removing scale, prolonged ultrasonic vibration can prevent excessive wear on the filter element 503. The interval is set according to the scaling rate, ensuring the stable performance of the filter element 503 while avoiding frequent cleaning that wastes energy. Staggering the cleaning time with the backwashing stage prevents the two cleaning methods from occupying the same water flow or energy resources, and also prevents interference between the backwash water flow and ultrasonic vibration. This ensures that each cleaning method achieves optimal results without affecting the overall operational stability of the system.

[0051] In one possible embodiment, the backwash water volume during the row backwashing stage is adjusted as needed by the flow regulating valve 13 to maintain the preset pressure and flow rate of the backwash water.

[0052] Specifically, the opening of the flow regulating valve 13 can be flexibly adjusted according to the degree of contamination of the filter element 503. When the contamination is severe, the opening is increased to increase the backwash water volume and pressure, thereby improving the cleaning effect; when the contamination is light, the opening is decreased to save water resources. On-demand adjustment ensures that the backwash water always maintains the preset pressure and flow rate, avoiding excessive pressure that could damage the filter element 503, or insufficient pressure that could lead to incomplete cleaning, thus achieving a balance between cleaning effect and equipment protection, while reducing water consumption.

[0053] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A filtration method integrating ultrasonic cleaning and separate offline backwashing, characterized in that, Includes the following steps: Filtration stage: Open the flow regulating valve (13) and all clean water outlet valves (8), close all backwash inlet valves (4), and the sewage enters the water tank / box (2) through the sewage inlet pipe (1), and then is filtered by the filter unit (6) and discharged or reused through the clean water branch pipe (10), the clean water main pipe (9), the water pump inlet pipe (11), the water pump outlet pipe (12) and the clean water discharge / reuse pipe (14); Backwashing stage: Adjust the flow regulating valve (13) to reduce the opening, so that some clean water enters the backwash main pipe (5) through the backwash connection pipe (7), open the backwash inlet valve (4) of the target row and close the clean water outlet valve (8) of the target row, backwash the filter element (503) of the target row, and after completion, close the backwash inlet valve (4) of the target row and open the clean water outlet valve (8) of the target row. Ultrasonic cleaning stage: Based on the degree of scaling on the filter element (503), the ultrasonic generator (16) is started at regular intervals to clean the filter element (503) in situ through the ultrasonic transducer (505).

2. The filtration method integrating ultrasonic cleaning and separate offline backwashing according to claim 1, characterized in that, During the row backwashing stage, one or two rows of filter elements (503) are backwashed at a time, and the remaining filter elements (503) continue to perform filtration during the backwashing process.

3. The filtration method integrating ultrasonic cleaning and separate offline backwashing according to claim 1, characterized in that, The cleaning duration and interval of the ultrasonic cleaning stage are preset by the program and are staggered in time from the branch backwashing stage.

4. The filtration method integrating ultrasonic cleaning and separate offline backwashing according to claim 1, characterized in that, The flow regulating valve (13) is used to adjust the backwash water volume during the row backwashing stage so that the backwash water maintains a preset pressure and flow rate.

5. A filtration system integrating ultrasonic cleaning and separate offline backwashing, used in the filtration method integrating ultrasonic cleaning and separate offline backwashing as described in any one of claims 1 to 4, characterized in that, Includes a sewage inlet pipe (1), a water tank / box (2), a filter unit (6), a clean water discharge / reuse pipe (14), a clean water main pipe (9), a clean water branch pipe (10), a clean water outlet valve (8), a backwash main pipe (5), a backwash branch pipe (3), a backwash inlet valve (4), a water pump (15), a water pump inlet pipe (11), a water pump outlet pipe (12), and an ultrasonic cleaning device; The sewage inlet pipe (1) is connected to the water tank / box (2); One end of the water pump inlet pipe (11) is connected to the main water purification pipe (9), and the other end of the water pump inlet pipe (11) is connected to the inlet of the water pump (15); one end of the water pump outlet pipe (12) is connected to the outlet of the water pump (15), and the other end of the water pump outlet pipe (12) is fixedly connected to the backwash connection pipe (7) and the purified water discharge / reuse pipe (14) respectively through a tee; The end of the backwash connection pipe (7) away from the water pump outlet pipe (12) is connected to the backwash main pipe (5). The backwash main pipe (5) is connected to several backwash branch pipes (3) one by one. Each backwash branch pipe (3) is equipped with a backwash inlet valve (4). A flow regulating valve (13) is fixedly arranged on the water discharge / reuse pipe (14). The main water pipe (9) is connected to several water branch pipes (10). Each water branch pipe (10) is equipped with a water outlet valve (8). The filter unit (6) is connected between the backwash branch pipe (3) and the purified water branch pipe (10); The ultrasonic cleaning device is used to perform in-situ ultrasonic cleaning of the filter element (503) of the filter unit (6).

6. The filtration system integrating ultrasonic cleaning and separate offline backwashing according to claim 5, characterized in that, The filter unit (6) is a single-unit structure, and the filter unit (6) includes a multi-port pipe (501), a connector (502), a filter element (503), and a mounting bracket (504). One or more of the multi-channel pipes (501) are arranged in rows at a set distance on the mounting bracket (504) to form the flow channel of the filter unit (6); The main pipe of the multi-port pipe (501) is connected to the backwash branch pipe (3) and the purified water branch pipe (10) at both ends. The main pipe of the multi-port pipe (501) has one or more branch pipes spaced at a set distance in the middle. Each branch pipe is connected to a filter element (503) through the connector (502). Through the row arrangement of the multi-port pipe (501) and the column connection of the branch pipes, the filter elements (503) are arranged in a matrix in the horizontal direction.

7. The filtration system integrating ultrasonic cleaning and separate offline backwashing according to claim 5, characterized in that, The ultrasonic cleaning device includes an ultrasonic generator (16) and an ultrasonic transducer (505). The ultrasonic generator (16) and the ultrasonic transducer (505) are connected by a cable. The ultrasonic generator (16) is installed on the outside of the water tank / box (2). The ultrasonic transducer (505) is fixed on the mounting bracket (504) and maintains a set distance from the filter element (503). The ultrasonic transducer (505) is located on the left and right sides or around the filter element (503).

8. The filtration system integrating ultrasonic cleaning and separate offline backwashing according to claim 5, characterized in that, The filter unit (6) is completely submerged in the pool / box (2). The filter unit (6) has a sludge storage space at a set height from the bottom of the pool / box (2). The pool / box (2) is equipped with a mud pump (17), which is used to pump the sludge to the filter press.

9. The filtration system integrating ultrasonic cleaning and separate offline backwashing according to claim 6, characterized in that, The filter element (503) is a tubular or hollow plate structure with a non-soft surface. The material of the filter element (503) is selected from one or more of stainless steel, composite materials, and ceramics. The filter element (503) is connected to the multi-port pipe (501) by threaded connection, clamp sleeve connection, or union connection.

10. The filtration system integrating ultrasonic cleaning and separate offline backwashing according to claim 6, characterized in that, The mounting bracket (504) is an open box or frame structure with a square cross-section. The bottom of the mounting bracket (504) is provided with a filter element support. The four sides of the mounting bracket (504) are perforated plates.

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