Dynamic membrane module device with automatic cleaning system and automatic cleaning method thereof

Abstract

The invention relates to a dynamic membrane module device with an automatic cleaning system and a cleaning method thereof, the dynamic membrane module device comprises a mounting rack, a membrane frame for fixing membranes and the automatic cleaning system, the membrane frame and the automatic cleaning system are detachably fixed on the mounting rack, the membranes are respectively fixed on the two outer surfaces of the membrane frame, so that the membrane frame and the membranes jointly define an internal space, and the internal space is arranged in the internal space. The bottom of the membrane frame is provided with a bottom cover and at least one bottom cleaning port communicated with the internal space, and the bottom cleaning port is opened or closed by the bottom cover; the automatic cleaning system comprises a driving device, an aeration cleaning device and a control unit, the driving device is used for driving the bottom cover to open or close the bottom cleaning opening; the aeration cleaning device is used for washing the inner surface of the membrane when the bottom cleaning opening is opened; and the control unit is respectively connected with the driving device and the aeration cleaning device and is used for controlling the working states of the driving device and the aeration cleaning device according to the membrane detection result. The inner surface and the outer surface of the diaphragm can be aerated and cleaned without disassembly, and the abrasion risk of the diaphragm is reduced.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and particularly to a dynamic membrane module with an automatic cleaning system and an automatic cleaning method thereof. Background Art

[0002] The core component of the dynamic membrane module can achieve solid-liquid separation through selective permeation. However, during operation, the surface of the membrane sheet is easily attached by pollutants (such as colloids, organic matters, microorganisms, etc.), resulting in a decrease in membrane flux. Existing technologies have made varying degrees of exploration on membrane sheet cleaning technology: Patent application CN109775920A discloses a self-cleaning MBR integrated membrane bioreactor. The MBR membrane module can be cleaned without disassembly, including a sedimentation tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR membrane tank, and a disinfection tank connected in sequence. An MBR membrane group is provided in the MBR membrane tank. The MBR membrane group includes a number of MBR membranes stacked in sequence and a housing. The MBR membranes are fixed on the housing by a pair of support frames. A cleaning device is provided on each MBR membrane. In actual use, the scraper is driven by a sliding motor to slide along the track, and the residue remaining on the MBR membrane is scraped to one side by the scraper, so as to ensure the cleanliness of the MBR membrane. Self-cleaning can be achieved without disassembling the entire MBR membrane group, with high cleaning efficiency and good effect. However, the method of driving the scraper for cleaning by a motor permanently set in the sewage not only has a complex equipment structure and high failure rate, but also the scraper cleaning is likely to damage the MBR membrane. Therefore, the actual operation cost and risk of this invention are relatively high.

[0003] Patent application CN117125820A discloses an AnDMBR dynamic membrane automatic cleaning device and method. The AnDMBR dynamic membrane automatic cleaning method includes the following steps: during the sludge anaerobic digestion process, the transmembrane pressure difference or membrane flux of the dynamic membrane module in the membrane area is detected in real time; when the transmembrane pressure difference ≥ 30 kPa or the membrane flux ≤ 5 LMH, the AnDMBR dynamic membrane automatic cleaning device automatically operates, and the dynamic membrane module is automatically cleaned by the water column nozzles on the flushing branch pipes; when the transmembrane pressure difference < 30 kPa or the membrane flux > 5 LMH, the AnDMBR dynamic membrane automatic cleaning device stops operating, and the AnDMBR dynamic membrane automatic cleaning ends. This invention can achieve the automatic cleaning of the AnDMBR dynamic membrane, solve the problem of excessive thickness of the dynamic membrane caused by the operation of AnDMBR under high sludge concentration, avoid the safety risks and operation complexity brought by opening the cover for cleaning, and maintain the long-term stable operation of AnDMBR. However, the nozzles of this invention are set in the membrane frame and only act on the cleaning of flat membranes, with insufficient compatibility. In addition, only one membrane sheet can be set for each flat membrane to ensure the full flushing effect of the nozzles on the membrane sheet, resulting in a large number of flat membrane sheets, a complex overall structure, and a large occupied volume.

[0004] Therefore, how to design a dynamic membrane module with a compact structure that can combine aeration, internal and external cleaning mechanisms, and intelligent automatic control without the need for disassembly has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the present invention provides a dynamic membrane module with an automatic cleaning system and an automatic cleaning method thereof, which solves the technical problems of high cost of disassembly and cleaning of the diaphragms of the dynamic membrane module, incomplete cleaning, complex structure and insufficient durability through the overall optimized structural design of the membrane frame diaphragm, mounting frame and automatic cleaning system and the matching combination of components.

[0006] In a first aspect, the present invention provides a dynamic membrane module with an automatic cleaning system, comprising: a mounting frame, a membrane frame for fixing a membrane, and an automatic cleaning system; The membrane frame and automatic cleaning system are detachably fixed on the mounting frame; The membrane sheets are respectively fixed on the two outer surfaces of the membrane frame, so that the membrane frame and the membrane sheet together enclose an internal space, and a bottom cover and at least one bottom cleaning port connected to the internal space are arranged at the bottom of the membrane frame, and the bottom cleaning port is opened or closed by the bottom cover; An automatic cleaning system, including a driving device, an aeration cleaning device and a control unit; A driving device, used for driving the bottom cover to open or close the bottom cleaning port; An aeration cleaning device, used for flushing the inner surface of the membrane when the bottom cover opens the bottom cleaning port; The control unit is connected to the driving device and the aeration and cleaning device respectively, and controls the working states of the driving device and the aeration and cleaning device according to the membrane detection result.

[0007] The present invention breaks through the technical limitations of traditional dynamic membrane modules, such as complex structure, low cleaning efficiency and cumbersome maintenance, through a modular detachable structure, bottom cover and aeration cleaning device driven targeted cleaning design. The detachable fixation of the mounting frame and the membrane frame enables rapid maintenance; the three-dimensional enclosure design of the membrane frame and the diaphragm can significantly increase the membrane carrying capacity of the membrane frame compared with the diaphragm clamping method of the prior art under the condition of the same membrane frame occupied volume. The linkage control of the cleaning port at the bottom of the membrane frame and the bottom cover ensures that the high-pressure airflow is accurately injected into the internal space and directly acts on the inner surface of the diaphragm, and the pollutants in the membrane pores are directionally stripped, so that the aforementioned three-dimensional enclosure design can operate stably for a long time, and combined with a simple cleaning action on the outer surface of the diaphragm, the filtration efficiency of the diaphragm can be quickly restored. In addition, the control unit automatically triggers the cleaning process based on real-time pollution detection, optimizes the working sequence of the driving device and the aeration cleaning device, and has the synergistic functions of aeration in the pool and diaphragm cleaning, reducing the space occupied by the structure and reducing operating energy consumption.

[0008] Further, the control unit controls the working states of the driving device and the aeration cleaning device according to the diaphragm detection result, including: The turbidity detector is used to detect the turbidity of the effluent of the dynamic membrane module in real time, and feedback the detection result to the control unit; The control unit compares the turbidity of the effluent detected in real time with the preset turbidity X to determine whether to start the automatic cleaning mode: If the turbidity of the effluent ≥ the preset turbidity X, start the automatic cleaning mode: The driving device drives the bottom cover to open the bottom cleaning port; The aeration cleaning device is started, and the inner surface of the diaphragm is flushed through the bottom cleaning port, or the inner surface and the outer surface of the diaphragm are flushed; After the automatic cleaning is completed, the driving device drives the bottom cover to close the bottom cleaning port; If the turbidity of the effluent < the preset turbidity X, the aeration cleaning device provides the aeration function in the pool.

[0009] Further, a top cover and at least one top cleaning port communicating with the internal space are further provided at the top of the membrane frame. The driving device drives the top cover to open or close the top cleaning port. When the top cover opens the top cleaning port, the aeration cleaning device flushes the inner surface of the diaphragm.

[0010] Optionally, the opening of the top cleaning port by the top cover is synchronized with the opening of the bottom cleaning port by the bottom cover, and the closing of the top cleaning port by the top cover is synchronized with the closing of the bottom cleaning port by the bottom cover.

[0011] On the basis that the cooperation of the bottom cover, the bottom cleaning port and the aeration cleaning device can basically complete the cleaning of the inner surface of the diaphragm and the discharge requirements of sewage and dirt, a top cover and a top cleaning port are added. By means of a synchronous or stepwise opening and closing strategy, an up-and-down two-way flushing channel is flexibly constructed to adapt to the cleaning requirements of different pollution degrees, which is beneficial to reducing the unidirectional flushing loss of the diaphragm and improving the cleaning efficiency. In the closed cover stage, the effective closing of the top cover and the bottom cover on the membrane frame can ensure the system tightness and filtration effect under the filtration condition. Through the deep coupling of structural innovation and intelligent control, the present invention significantly improves the cleaning coverage rate and operation and maintenance convenience, and provides an efficient and reliable technical support for diversified sewage treatment scenarios.

[0012] Correspondingly, when the bottom cover and the bottom cleaning port, the top cover and the top cleaning port are provided, if the turbidity of the effluent ≥ the preset turbidity X, start the automatic cleaning mode, including: The driving device drives the top cover to open the top cleaning port and drives the bottom cover to open the bottom cleaning port; The aeration cleaning device is started, and the inner surface of the diaphragm is flushed through the top cleaning port and the bottom cleaning port, or the control unit adjusts the spraying direction of the aeration head to flush both the inner surface and the outer surface of the diaphragm; After the automatic cleaning is completed, the driving device drives the top cover to close the top cleaning port and drives the bottom cover to close the bottom cleaning port.

[0013] Furthermore, the top cover is hinged to the top of the membrane frame, and the bottom cover is hinged to the bottom of the membrane frame; The driving device includes a power unit, an upper cross bar connected to the top cover, and a lower cross bar connected to the bottom cover; The power unit drives the upper cross bar to move upward to drive the top cover to rotate and open the top cleaning port, and drives the lower cross bar to move downward to drive the bottom cover to rotate and open the bottom cleaning port; The driving device further includes a top cover reset member connected to the top cover and a bottom cover reset member connected to the bottom cover. The top cover reset member causes the top cover to rotate downward to close the top cleaning port, and the bottom cover reset member causes the bottom cover to rotate upward to close the bottom cleaning port.

[0014] The present invention realizes the fully automatic synchronous / stepwise opening and closing operations of the top cover and the bottom cover through the cooperative control mechanism of the power unit and the reset member.

[0015] Preferably, the opening of the top cleaning port by the top cover and the opening of the bottom cleaning port by the bottom cover are carried out synchronously, and the closing of the top cleaning port by the top cover and the closing of the bottom cleaning port by the bottom cover are carried out synchronously.

[0016] The power unit of the present invention adopts a modular drive design, and various power sources such as motor drive, cylinder drive, and hydraulic drive can be selected. Through replaceable transmission schemes such as pulley-rope transmission, gear-rack meshing, or screw linear transmission, the power output is converted into the synchronous opening and closing actions of the top cover and the bottom cover; among them, the gear / screw transmission precisely controls the opening and closing angle through rotational motion, adapts to high-precision cleaning scenarios, and when multiple groups of parallel membrane frames are configured on the mounting frame, each top cover and bottom cover can achieve mechanical synchronization through linkage mechanisms such as upper cross bars and lower cross bars, and are batch-driven to open and close by a single power unit, ensuring the unity of the cleaning sequence of multiple membrane groups, while improving the thoroughness of the removal of contaminants in the membrane pores, significantly reducing the operation and maintenance complexity of the multi-component system, and expanding the large-scale application ability of the equipment.

[0017] Preferably, the top cover reset member and the bottom cover reset member preferably adopt a spring structure to provide the restoring force.

[0018] Furthermore, sealing members are provided on the inner wall of the top cover facing the top of the membrane frame and the inner wall of the bottom cover facing the bottom of the membrane frame, which are used to fill the pores between the cover body and the membrane frame when the top cover closes the top of the membrane frame and the bottom cover closes the bottom of the membrane frame, and better seal the top cleaning port and the bottom cleaning port, improving the overall sealing performance and filtering effect of the membrane frame. The sealing member can be a rubber material sealing member, which has elasticity, sealing performance, and durability.

[0019] Further, the power unit includes a motor fixed on the mounting frame and a telescopic push rod driven by the motor. The free end of the telescopic push rod is connected to the upper cross bar through a first rope that bypasses a first fixed pulley. The upper cross bar and the lower cross bar are fixedly connected through a second rope that bypasses a second fixed pulley. The first fixed pulley is fixed at the top of the mounting frame, and the second fixed pulley is fixed at the bottom of the mounting frame.

[0020] The dynamic membrane unit of the present invention realizes the automatic and precise opening and closing of the top cover / bottom cover through the coordinated control of the power unit - transmission mechanism - reset system. Specifically, the motor of the power unit drives the telescopic push rod to contract. Through the first fixed pulley and the first rope, the upper cross bar is pulled upward, driving the top cover to rotate upward around the hinge axis to open the top cleaning port. At the same time, the second fixed pulley and the second rope drive the lower cross bar to move downward, pulling the bottom cover to rotate downward around the hinge axis to open the bottom cleaning port. During this process, the rigid conduction of the rope and the direction-changing effect of the fixed pulley ensure the stability of the synchronous movement of the top / bottom cover. Further, the top cover reset member includes a top cover reset spring. The upper end of the top cover reset spring is connected to the inner wall of the top cover, and the lower end is fixed on the membrane frame or the mounting frame. Vertically, the fixed position of the lower end of the top cover reset spring is lower than the top cover. The bottom cover reset member includes a bottom cover reset spring. The lower end of the bottom cover reset spring is connected to the inner wall of the bottom cover, and the upper end is fixed on the membrane frame or the mounting frame. Vertically, the fixed position of the upper end of the bottom cover reset spring is higher than the bottom cover.

[0021] Preferably, the lower end of the top cover reset spring is fixed on the membrane frame, and the upper end of the bottom cover reset spring is preferably fixed on the membrane frame. For example, it is connected to the membrane frame through a support member fixed on the membrane frame. Thus, the top cover reset member and the bottom cover reset member are integrally fixed on the membrane frame, and can be mobilized, replaced or repaired together with the membrane frame. When the membrane frame is removed relative to the mounting frame, there is no need to disassemble the spring from the mounting frame in advance.

[0022] During cleaning, when the top cover is opened, the top cover reset spring is stretched to accumulate the restoring force. When the bottom cover is opened, the bottom cover reset spring is stretched to accumulate the restoring force. When the cleaning is completed, the motor rotates in the reverse direction to release the rope tension. The restoring force of the top cover reset spring plus the gravity of the top cover cause the top cover to rotate and close. The restoring force of the bottom cover reset spring pulls the bottom cover to overcome its own weight and pull it upward, and the bottom cover rotates and resets to close. The way of providing the restoring force by the spring stretching deformation simplifies the structure of the reset member, and the reset function can be repeatedly operated. Even if it is set in the wastewater for a long time, the loss is not large, and it is convenient to replace. In addition, in order to prevent the stainless steel spring from wearing the membrane and the membrane frame, it is also a preferred method to replace the contact part between the reset member and the membrane and the membrane frame with a rope, that is, to form a discontinuous spring and rope combined reset member, but it is necessary to ensure that enough restoring force can be provided for the top cover and the bottom cover.

[0023] Further, the dynamic membrane module includes a plurality of membrane frames fixedly arranged in parallel on a mounting rack. Each membrane frame is correspondingly provided with a top cover and a bottom cover. Each top cover is synchronously driven to open or close by a driving device, and each bottom cover (4) is synchronously driven to open or close by a driving device (5).

[0024] For the parallel structure of multiple membrane frames, the cross bars of all top covers / bottom covers are serially driven by the same set of power units to achieve synchronous opening and closing control. A flexible connection is adopted between each top cover and the upper cross bar, and between each bottom cover and the lower cross bar. A rope connection can be used, or a spring connection can be used, or other connection methods can be used. That is, when the upper cross bar moves upward and the lower cross bar moves downward, it does not affect the rotation and opening of the top cover hinged at the top of the membrane frame, does not affect the rotation and opening of the bottom cover hinged at the bottom of the membrane frame, and does not prevent the closing of the top cover and the bottom cover.

[0025] Further, the aeration and cleaning device includes an upper air pipe and a lower air pipe arranged on the upper part of the mounting rack. The upper air pipe is communicated with a plurality of upper branch pipes, and the lower air pipe is communicated with a plurality of lower branch pipes. Each upper branch pipe is provided with an aeration head with a variable spraying direction corresponding to a top cleaning port, and each lower branch pipe is provided with an aeration head with a variable spraying direction corresponding to a bottom cleaning port. The aeration head provides the functions of aeration in the pool, flushing the outer surface of the membrane, and flushing the inner surface of the membrane.

[0026] In a second aspect, the present invention provides an automatic cleaning method using the dynamic membrane module with an automatic cleaning system, including the following steps: Step 1: Real-time detect the turbidity of the effluent of the dynamic membrane module, and feed back the detection result to the control unit; Step 2: The control unit compares the real-time detected turbidity of the effluent with a preset turbidity X to determine whether to start the automatic cleaning mode: If the turbidity of the effluent ≥ the preset turbidity X, start the automatic cleaning mode: The driving device drives the bottom cover to open the bottom cleaning port; The aeration and cleaning device is started, and the inner surface of the membrane is flushed through the bottom cleaning port, or the inner surface and the outer surface of the membrane are flushed; After the automatic cleaning is completed, the driving device drives the bottom cover to close the bottom cleaning port; If the turbidity of the effluent < the preset turbidity X, the aeration and cleaning device provides the function of aeration in the pool.

[0027] The detection of the turbidity of the effluent of the dynamic membrane module is a direct and effective detection means, which can more intuitively reflect the cleaning requirement of the dynamic membrane module. Among them, the value of the preset turbidity X can be 5 - 12 NTU, preferably 6 - 10 NTU. In addition, it is also feasible to detect the liquid level of the aerobic tank and other parameters, such as the membrane flux, etc. to determine whether to start the automatic cleaning mode. However, a large number of experiments show that the detection and control of the turbidity of the effluent are more effective and convenient means.

[0028] When only a bottom cover and at least one bottom cleaning port are provided on the membrane frame, the aeration cleaning device only needs to be provided with a lower air pipe, the lower air pipe communicates with a plurality of lower branch pipes, and each lower branch pipe is provided with an aeration head with a variable spraying direction corresponding to the bottom cleaning port, and the flushed sewage and dirt are discharged from the bottom cleaning port.

[0029] Further, when, on the basis of providing a bottom cover and at least one bottom cleaning port on the membrane frame, a top cover and at least one top cleaning port are also provided on the top; When the control unit starts the automatic cleaning mode, the driving device drives the top cover to open the top cleaning port, and the aeration cleaning device flushes the inner surface of the membrane through the top cleaning port; after the automatic cleaning is completed, the driving device drives the top cover to close the top cleaning port.

[0030] Further, the aeration cleaning device includes an upper air pipe and a lower air pipe arranged on the mounting rack, the upper air pipe communicates with a plurality of upper branch pipes, the lower air pipe communicates with a plurality of lower branch pipes, each upper branch pipe is provided with an aeration head with a variable spraying direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable spraying direction corresponding to the bottom cleaning port; When the control unit starts the automatic cleaning mode, the driving device drives the top cover to open the top cleaning port, drives the bottom cover to open the bottom cleaning port, the aeration heads of the upper branch pipes flush the inner surface of the membrane synchronously or alternately up and down through the top cleaning port, and the aeration heads of the lower branch pipes flush the inner surface of the membrane through the bottom cleaning port, and the flushed sewage and dirt are discharged from the bottom cleaning port; or, the control unit adjusts the spraying direction of the aeration head to flush both the inner surface and the outer surface of the membrane.

[0031] Further, the driving device includes a power unit, a top cover reset member connected to the top cover, and a bottom cover reset member connected to the bottom cover; When the control unit starts the automatic cleaning mode, the power unit drives the top cover to open the top cleaning port, and at the same time drives the bottom cover to open the bottom cleaning port; after the automatic cleaning is completed, the top cover reset member resets the top cover to close the top cleaning port, and the bottom cover reset member resets the bottom cover to close the bottom cleaning port.

[0032] After cleaning, if the effluent turbidity of the dynamic membrane module still cannot meet the requirements, parameters such as the transmembrane pressure difference TMP or membrane flux of each membrane frame / each membrane of the dynamic membrane module can be detected, and it is determined whether manual detection / cleaning / replacement is required according to the detection results, so as to avoid the performance decline of the membrane of a certain membrane frame, and other membranes need to compensate for its function. At the beginning, the overall performance decline of the system is not obvious, but the problems of individual membranes may be masked, which may lead to too fast decline in the overall performance of the system, unqualified effluent turbidity, increased overall automatic cleaning frequency, increased operation cost and reduced service life of other membrane frames and membranes.

[0033] Further, pressure sensors are respectively arranged on both sides (the water inlet side and the water outlet side) of each membrane frame to independently detect the water inlet side pressure and the water outlet side pressure of each membrane frame. Optionally, pressure sensors are respectively arranged on both sides of each membrane sheet to independently detect the water inlet side pressure and the water outlet side pressure of each membrane sheet. Each pressure sensor is connected to the control unit. Preferably, at least 2 pressure sensors are arranged on each side, more preferably at least 3. For example, when 2 pressure sensors are arranged, they can be arranged vertically along the height direction of the membrane sheet. When 3 pressure sensors are arranged, they can be arranged at the upper, middle and lower parts along the height direction of the membrane sheet. When 5 pressure sensors are arranged, they can be arranged in the four corner areas and the middle area of the membrane sheet, so as to obtain the average pressure value and avoid frequent disassembly, detection and maintenance work caused by excessive errors.

[0034] The control unit obtains the TMP calculation result of the membrane frame / membrane sheet according to TMP = average water inlet side pressure - average water outlet side pressure; The control unit compares the TMP calculation result with the set threshold value to judge whether the corresponding membrane frame / membrane sheet needs to be manually detected: if the TMP calculation result exceeds the set threshold value, it is determined that there is a risk of damage to the membrane frame / membrane sheet, and it is prompted that manual detection is required, and the membrane frame will be unloaded from the mounting rack for inspection. Optionally, if the physical structure of the membrane sheet on the membrane frame is intact and there is no obvious damage, etc., it can be detected again after manual cleaning (such as chemical cleaning). If it still cannot be restored to the available range, the damaged membrane sheet (single piece or double piece) on the membrane frame will be replaced; among them, the set threshold value is about 20 - 50 kPa, preferably 25 - 35 kPa, and is specifically adjusted according to the initial parameters of the selected membrane frame membrane sheet and the actual working conditions (such as flow rate, temperature, etc.).

[0035] In actual operation, pressure sensors are mostly arranged on both sides of the membrane frame, so that two membrane sheets can be monitored together. Once a damage prompt signal appears, the staff also need to disassemble the entire membrane frame fixing the two membrane sheets for inspection. Therefore, considering the cost and maintenance situation, it is sufficient to arrange pressure sensors on both sides of the membrane frame for transmembrane pressure difference detection.

[0036] The present invention has at least the following beneficial effects: (1) In traditional dynamic membrane modules, due to the strong enclosure of the frame and the dependence on manual operation for disassembly and assembly, it is difficult for the cleaning medium to reach the deep inner area of the membrane sheet, and the maintenance efficiency is low. Through the open design at the bottom of the membrane frame, especially when multiple cleaning ports are designed at both the top and bottom of the membrane frame, combined with the hinged connection of the top cover and the bottom cover and the fixed pulley - rope transmission mechanism in the driving device, the top cover and the bottom cover open and close synchronously and in opposite directions (the top cover is lifted up and the bottom cover is turned down) under the drive of the power unit, completely exposing the inner and outer surfaces of the membrane sheet. This design breaks through the spatial limitation of the cleaning medium by the traditional closed or semi - closed frame, enabling water flow or air flow to penetrate axially along the membrane sheet, preferably in both directions, effectively eliminating cleaning blind spots. At the same time, the cooperation of the spring reset component and the power unit realizes the self - locking and rapid reset of the opening and closing actions, transforming the manual operation link into a fully automatic control process, significantly shortening the maintenance cycle and reducing the operation complexity.

[0037] (2) Aiming at the problems of pollutant residue and secondary leakage in the membrane pores caused by the single jet angle and limited coverage range of the fixed aeration head in the prior art, through the hierarchical layout design of the lower air path as a must - option and the upper air path as an option, combined with the coordinated control of the variable - direction aeration head, this invention achieves a double breakthrough in cleaning efficiency and system sealing performance. The hierarchical air path design ensures the basic cleaning ability while realizing the switching of multiple cleaning modes and the dynamic balance of energy consumption and cleaning intensity through the on - demand start and stop of each air path, effectively extending the service life of the membrane sheet and reducing the maintenance cost.

[0038] (3) Due to the lack of real - time monitoring and independent control units in traditional systems, it is difficult to adapt to different pollution scenarios, easily resulting in insufficient cleaning or resource waste. By setting up a turbidity sensing module, an optional transmembrane pressure difference or membrane flux detection module and matching the drive - aeration linkage control logic, this invention can dynamically trigger the cleaning strategy according to water quality changes, and adaptively adjust the cleaning method, intensity and duration, extending the service life of each membrane sheet, membrane frame, etc. and the dynamic membrane module. In addition, in the parallel design, the connecting drive crossbar and the reset spring of each membrane frame are beneficial for batch operation to improve the cleaning efficiency and reduce energy consumption. This architecture enables the system to have both high - efficiency cleaning ability and adaptability to diversification and scale treatment, significantly expanding the application scope of the dynamic membrane module. Description of the Drawings

[0039] By reading the following detailed description with reference to the accompanying drawings, the above - mentioned and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where: Figure 1 is a schematic structural diagram of the dynamic membrane module of the present invention; Figure 2 is a schematic structural diagram of the dynamic membrane module of the present invention without the membrane sheet; Figure 3 It is a schematic structural diagram of the membrane frame of the present invention; Figure 4 It is a schematic structural diagram of the bottom of the membrane frame of the present invention.

[0040] Explanation of reference numerals: 1 - mounting rack, 2 - membrane frame, 3 - top cover, 4 - bottom cover, 5 - driving device, 6 - aeration cleaning device, 7 - top cover return spring, 8 - bottom cover return spring, 9 - first fixed pulley, 10 - second fixed pulley, 11 - telescopic push rod, 12 - first rope, 13 - second rope, 5.1 - power unit, 5.2 - upper cross bar, 5.3 - lower cross bar, 15 - bottom cleaning port, 16 - pressing plate. Detailed implementation manners

[0041] In order to better understand the above technical solution, the following will combine the description of the specification and specific implementation manners to make a detailed description of the above technical solution. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0042] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0043] It should also be noted that the term "comprises", "comprising" or any other variation thereof is intended to cover a non - exclusive inclusion, such that a commodity or device including a series of elements includes not only those elements but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of another identical element in the commodity or device including the said element.

[0044] As Figures 1-4 shown, the present invention provides a dynamic membrane module with an automatic cleaning system, including a mounting rack, a membrane frame for fixing membrane sheets and an automatic cleaning system. The specific structure is as follows: (1) Mounting rack 1, the membrane frame 2 and the automatic cleaning system are detachably fixed on the mounting rack 1. The specific configuration of the mounting rack 1 is not unique. For example, a cube - frame structure is adopted, which is convenient for inserting and detaching the membrane frame 2 with a cube structure, and is also convenient for stable placement and flexible use; (2) The membrane frame 2, preferably made of stainless steel, is designed as a hollow quadrilateral frame structure, similar to a window screen frame. The membrane frame 2 includes a bottom cover 4 hinged to the bottom and at least one bottom cleaning port 15, and the bottom cleaning port 15 is opened or closed by the bottom cover 4. More preferably, 1-5 bottom cleaning ports 15 are arranged along the length direction of the bottom of the membrane frame. Refer to Figure 4 ; Preferably, the membrane frame 2 is also provided with a top cover 3 hinged to the top and at least one top cleaning port. The structure and arrangement of the top cleaning port are similar to those of the bottom cleaning port (omitted). The top cleaning port is opened or closed by the top cover 3. More preferably, 1-5 top cleaning ports are arranged along the length direction of the top of the membrane frame; Membranes are respectively fixed on two outer surfaces of the membrane frame 2. The two membranes are fixed relatively parallel and sandwich the membrane frame 2. The membrane frame 2 and the two membranes jointly enclose an internal space. Multiple pressing plates 16 press and fix the membranes along the edges of the outer surface of the membrane frame 2. The pressing plates 16 can be made of stainless steel.

[0045] The top cleaning port and the bottom cleaning port 15 connect the internal space enclosed by the membrane frame 2 and the membranes with the external environment. The top cover 3 and the bottom cover 4 can rotate to open and close the top cleaning port and the bottom cleaning port 15 of the membrane frame 2, so as to controllably open the internal space; Rubber seals can be arranged on the inner wall of the top cover 3 facing the top of the membrane frame 2 and on the inner wall of the bottom cover 4 facing the bottom of the membrane frame 2, for filling the pores between the cover body and the membrane frame 2 when the top cover 3 and the bottom cover 4 close the top / bottom of the membrane frame 2, and better closing the top cleaning port and the bottom cleaning port 15.

[0046] Multiple membrane frames 2 can be inserted side by side and fixed to the mounting rack 1. For example, 3-10 membrane frames 2 are fixed side by side on the mounting rack 1, preferably 5-8. The top covers 3 of all membrane frames 2 are flexibly connected in parallel with a cross bar, and all bottom covers 4 are flexibly connected in parallel with a lower cross bar. They are synchronously driven by the same set of power units 5.1 to realize synchronous opening of all top covers 3 and all bottom covers 4. And due to the setting of the spring return members, after the power units 5.1 release force, all top covers 3 and all bottom covers 4 can close almost synchronously.

[0047] Online detection devices for detecting the performance of the membranes of the membrane frames can be arranged in each membrane frame, so as to timely master the loss situation of each membrane frame, and process or replace individual membrane frames in time according to the detection results. For example, 2-5 pressure sensors can be respectively arranged on the water inlet side and the water outlet side of each membrane frame. Each pressure sensor is connected to a control unit to independently detect the pressure on the water inlet side and the pressure on the water outlet side of each membrane frame, and feedback the detection results to the control unit to obtain the transmembrane pressure difference of each membrane. The state of each membrane is determined by comparing the detected transmembrane pressure difference with the set threshold. Pressure sensors can also be arranged on both sides of each membrane, which can more accurately detect the performance of a single membrane.

[0048] (3)Automatic cleaning system, including a driving device 5, an aeration cleaning device 6 and a control unit, wherein: (3.1)Driving device 5, including a power unit 5.1, an upper crossbar 5.2 connected to the top cover 3, a lower crossbar 5.3 connected to the bottom cover 4, a top cover return spring 7 connected to the top cover 3, and a bottom cover return spring 8 connected to the bottom cover 4. The power unit 5.1 drives the upper crossbar 5.2 to move upward to drive the top cover 3 to rotate to open the top cleaning port, and drives the lower crossbar 5.3 to move downward to drive the bottom cover 4 to rotate to open the bottom cleaning port 15; The power unit 5.1 further includes a motor fixed on the mounting frame 1 and a telescopic push rod 11 driven by the motor. The free end of the telescopic push rod 11 is connected to the upper crossbar 5.2 through a first rope 12 that bypasses a first fixed pulley 9. The upper crossbar 5.2 and the lower crossbar 5.3 are fixedly connected through a second rope 13 that bypasses a second fixed pulley 10. The first fixed pulley 9 is fixed at the top of the mounting frame 1, and the second fixed pulley 10 is fixed at the bottom of the mounting frame 1. When the motor of the power unit 5.1 drives the telescopic push rod 11 to contract, the upper crossbar 5.2 is pulled upward through the first fixed pulley 9 and the first rope 12, driving the top cover 3 to flip upward around the hinge axis to open the top cleaning port; at the same time, the second fixed pulley 10 and the second rope 13 drive the lower crossbar 5.3 to move downward, pulling the bottom cover 4 to flip downward around the hinge axis to open the bottom cleaning port 15.

[0049] The driving device 5 further includes a top cover 3 return member connected to the top cover 3 and a bottom cover 4 return member connected to the bottom cover 4. The top cover 3 return member causes the top cover 3 to rotate downward to close the top cleaning port, and the bottom cover 4 return member causes the bottom cover 4 to rotate upward to close the bottom cleaning port 15; The top cover return member includes a top cover return spring 7. The upper end of the top cover return spring 7 is connected to the inner wall of the top cover 3, and the lower end is fixed on the membrane frame 2 or the mounting frame 1. In the vertical direction, the fixed position of the lower end of the top cover return spring 7 is lower than the top cover 3. The bottom cover 4 return member includes a bottom cover return spring 8. The lower end of the bottom cover return spring 8 is connected to the inner wall of the bottom cover 4, and the upper end is fixed on the membrane frame 2 or the mounting frame 1. In the vertical direction, the fixed position of the upper end of the bottom cover return spring 8 is higher than the bottom cover 4. During cleaning, when the top cover is opened, the top cover return spring is stretched to accumulate a restoring force, and when the bottom cover is opened, the bottom cover return spring is stretched to accumulate a restoring force. When cleaning is completed, the motor runs in reverse to release the rope tension. The restoring force of the top cover return spring plus the gravity of the top cover causes the top cover to rotate back and close; the restoring force of the bottom cover return spring pulls the bottom cover to overcome its own weight and pull it upward, and the bottom cover rotates back and closes.

[0050] (3.2)The aeration cleaning device 6 is arranged on the upper air pipe and the lower air pipe of the mounting frame 1. The upper air pipe is communicated with a plurality of upper branch pipes, and the lower air pipe is communicated with a plurality of lower branch pipes. Each upper branch pipe is provided with an aeration head with a variable spraying direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable spraying direction corresponding to the bottom cleaning port 15. The aeration head provides the functions of aeration in the pool, flushing the outer surface of the diaphragm, and flushing the inner surface of the diaphragm.

[0051] Among them, when 5 membrane frames are fixed side by side on the mounting frame 1, and each membrane frame has 3 top cleaning ports and 3 bottom cleaning ports 15, an upper air pipe connecting 5 upper branch pipes and a lower air pipe connecting 5 lower branch pipes can be arranged on the mounting frame 1, and 3 aeration heads are arranged corresponding to each cleaning port of each branch pipe.

[0052] (3.3)The control unit is respectively connected to the driving device 5 and the aeration cleaning device 6; The control unit starts / stops the automatic cleaning mode according to the real-time feedback results of the treatment pool detection unit and the diaphragm detection unit. When starting, it triggers the power unit 5.1, and the high-pressure air flow of the associated aeration cleaning device 6 is sprayed in multiple directions from the bottom cleaning port 15 and the optional top cleaning port to form a full-coverage flushing of the inner surface of the diaphragm; after stopping, the external aeration in the pool maintains the biological reaction activity, realizing the seamless connection between the cleaning process and the sewage treatment.

[0053] Based on the above device, the present invention provides an automatic cleaning method for a dynamic membrane module, specifically including the following steps: Step 1: Detect the effluent turbidity of the dynamic membrane module through implementation and feed back the detection result to the control unit; Step 2: The control unit compares the real-time detected effluent turbidity with the preset turbidity X to determine the start or stop of the automatic cleaning mode: If the effluent turbidity ≥ the preset turbidity X, and the preset turbidity X ranges from 5 to 12 NTU, preferably 6 to 10 NTU, start the automatic cleaning mode: The motor of the power unit 5.1 drives the telescopic push rod 11 to move telescopically, and the upper cross bar 5.2 is pulled up through the first fixed pulley 9 and the first rope 12, driving the top cover 3 to rotate upward around the hinge axis to open the top cleaning port; at the same time, the second fixed pulley 10 and the second rope 13 are associated to move the lower cross bar 5.3 downward, pulling the bottom cover 4 to rotate downward around the hinge axis to open the bottom cleaning port 15; After the top cleaning port and the bottom cleaning port 15 are opened, the aeration heads of the aeration cleaning device 6 are started, and each aeration head flushes the inner surface of the diaphragm synchronously up and down or alternately up and down at a spraying intensity of supplying 15 - 35 cubic meters of gas per hour per square meter of sewage for 10 - 60 minutes, flushing the flow channels bidirectionally up and down to adapt to the cleaning requirements of different pollution degrees; the control unit can adjust the spraying direction of the aeration heads to flush the outer surface of the diaphragm; the cleaning sewage and dirt in the internal space are discharged from the bottom cleaning port 15; Optionally, each aeration head has at least the following working modes: Working mode 1: When the aeration heads flush continuously synchronously up and down, the spraying intensity can be selected to supply 24 ± 2 cubic meters of gas per hour per square meter of sewage and last for 10 - 45 minutes; Working mode 2: When the aeration heads flush intermittently synchronously up and down, the spraying intensity can be selected to supply 30 ± 2 cubic meters of gas per hour per square meter of sewage, spray for 10 - 15 minutes each time, with an interval of 3 - 5 minutes, and spray 2 - 3 times; Working mode 3: When the aeration heads flush alternately up and down, the spraying intensity can be selected to supply 30 ± 2 cubic meters of gas per hour per square meter of sewage, the upper / lower aeration heads spray for 5 - 10 minutes each time, exchange after an interval of 1 - 3 minutes, and the upper and lower aeration heads each spray 2 - 3 times.

[0054] Each working mode can be used alone or in combination, which means that in one automatic cleaning, all aeration heads can execute one working mode, or different working modes can be executed according to the detection results of different membrane frame contaminations; or between different automatic cleanings, the same or different working modes can be selected.

[0055] After the automatic cleaning is completed, the control unit stops the automatic cleaning mode, and the driving device 5 drives the top cover 3 to close the top cleaning port, and drives the bottom cover 4 to close the bottom cleaning port 15, including: the motor runs in reverse to release the rope tension, and the top cover return spring 7 forces the top cover 3 to rotate back to its original position and close, and the bottom cover return spring 8 forces the bottom cover 4 to rotate back to its original position and close.

[0056] If the detected effluent turbidity < preset turbidity X, the aeration cleaning device 6 provides in - pool aeration. In the initial stage of using the dynamic membrane module, or after meeting the requirements through automatic cleaning, the dynamic membrane module is in the filtration working state, and the aeration cleaning device 6 provides in - pool aeration for the aerobic tank. At this time, the control unit can also control the aeration parameters such as the aeration range and the aeration volume provided by the aeration heads for the aerobic tank according to the detection results of the aerobic tank, etc.

[0057] If the effluent turbidity of the dynamic membrane module still fails to meet the requirements after cleaning, parameters such as the transmembrane pressure difference TMP or the membrane flux of each membrane frame / each membrane sheet of the dynamic membrane module can be detected, and it is determined whether manual detection / cleaning / replacement is required according to the detection results.

[0058] Specifically, three pressure sensors are respectively arranged on the water inlet side and the water outlet side of each membrane frame. The three pressure sensors on each side are arranged at the upper, middle and lower positions along the height direction of the membrane sheet, and each pressure sensor is connected to the control unit. The pressure sensors detect the water inlet side pressure and the water outlet side pressure of each membrane frame, and feedback the detection results to the control unit. The control unit calculates the TMP value of the membrane frame, and compares the TMP calculation result with the set threshold. If the TMP value of a certain membrane frame exceeds the set threshold, the control unit prompts that the membrane frame needs manual detection to determine the damage condition of the membrane sheet of the membrane frame. If necessary, chemical cleaning is carried out. If the detection still fails to meet the requirements after cleaning, the membrane sheet fixed on the membrane frame can be replaced.

[0059] Therefore, through the dynamic membrane module with an automatic cleaning system and its automatic cleaning method of the present invention, it is possible to simply realize the automatic collaborative cleaning of the inner surface and the outer surface of the membrane sheet fixed on the membrane frame without disassembling each membrane frame in the dynamic membrane module, and the distance between membrane frames and / or between membrane sheets can be reduced as needed, the number of membrane frames carried by the mounting rack can be increased, and the filtration effect of the dynamic membrane module in the same occupied space can be improved. And according to the loss condition of the membrane sheets in each membrane frame, the membrane sheets to be maintained can be processed or replaced in time to ensure the overall filtration effect of the dynamic membrane module and effectively extend the service life of other membrane sheets.

[0060] The preferred embodiments of the present invention are introduced above, aiming to make the spirit of the present invention clearer and easier to understand, rather than to limit the present invention. Any modifications, substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope defined by the claims appended to the present invention.

Claims

1. A dynamic membrane module with an automatic cleaning system, characterized in that, Comprising: A mounting bracket (1), a membrane frame (2) for fixing the membrane, and an automatic cleaning system; The membrane frame (2) and the automatic cleaning system are detachably fixed to the mounting bracket (1); Membranes are respectively fixed on two outer surfaces of the membrane frame (2), such that the membrane frame (2) and the membranes jointly enclose an internal space. A bottom cover (4) and at least one bottom cleaning port (15) communicating with the internal space are provided at the bottom of the membrane frame (2), and the bottom cleaning port (15) is opened or closed by the bottom cover (4); The automatic cleaning system includes a driving device (5), an aeration cleaning device (6), and a control unit; The driving device (5) is used to drive the bottom cover (4) to open or close the bottom cleaning port (15); The aeration cleaning device (6) is used to flush the inner surface of the membrane when the bottom cover (4) opens the bottom cleaning port (15); The control unit is respectively connected to the driving device (5) and the aeration cleaning device (6), and controls the working states of the driving device (5) and the aeration cleaning device (6) according to the membrane detection result.

2. The dynamic membrane module according to claim 1, characterized in that, A top cover (3) and at least one top cleaning port communicating with the internal space are further provided at the top of the membrane frame (2). The driving device (5) drives the top cover (3) to open or close the top cleaning port, and the aeration cleaning device (6) flushes the inner surface of the membrane when the top cover (3) opens the top cleaning port.

3. The dynamic membrane module according to claim 2, characterized in that, The top cover (3) is hinged to the top of the membrane frame (2), and the bottom cover (4) is hinged to the bottom of the membrane frame (2); The driving device (5) includes a power unit (5.1), an upper cross bar (5.2) connected to the top cover (3), and a lower cross bar (5.3) connected to the bottom cover (4); The power unit (5.1) drives the upper cross bar (5.2) to move upward to drive the top cover (3) to rotate to open the top cleaning port, and drives the lower cross bar (5.3) to move downward to drive the bottom cover (4) to rotate to open the bottom cleaning port (15); The driving device (5) further includes a top cover reset member connected to the top cover (3) and a bottom cover reset member connected to the bottom cover (4). The top cover reset member causes the top cover (3) to rotate downward to close the top cleaning port, and the bottom cover reset member causes the bottom cover (4) to rotate upward to close the bottom cleaning port (15).

4. The dynamic membrane module according to claim 3, characterized in that, The power unit (5.1) includes a motor fixed to the mounting bracket (1) and a telescopic push rod (11) driven by the motor. The free end of the telescopic push rod (11) is connected to the upper cross bar (5.2) through a first rope (12) bypassing a first fixed pulley (9). The upper cross bar (5.2) and the lower cross bar (5.3) are fixedly connected through a second rope (13) bypassing a second fixed pulley (10). The first fixed pulley (9) is fixed to the top of the mounting bracket (1), and the second fixed pulley (10) is fixed to the bottom of the mounting bracket (1).

5. The dynamic membrane module according to claim 3 or 4, characterized in that, The top cover reset member includes a top cover reset spring (7). The upper end of the top cover reset spring (7) is connected to the inner wall of the top cover (3), and the lower end is fixed to the membrane frame (2) or the mounting bracket (1). Vertically, the fixed position of the lower end of the top cover reset spring (7) is lower than the top cover (3); The bottom cover reset member includes a bottom cover reset spring (8). The lower end of the bottom cover reset spring (8) is connected to the inner wall of the bottom cover (4), and the upper end is fixed on the membrane frame (2) or the mounting rack (1). Vertically, the fixed position of the upper end of the bottom cover reset spring (8) is higher than that of the bottom cover (4).

6. The dynamic membrane module according to any one of claims 2 - 4, characterized in that, It includes a plurality of membrane frames (2) fixedly arranged in parallel on the mounting rack (1). Each membrane frame (2) is correspondingly provided with a top cover (3) and a bottom cover (4). Each top cover (3) is synchronously driven to open or close by a driving device (5), and each bottom cover (4) is synchronously driven to open or close by the driving device (5).

7. The dynamic membrane module according to claim 6, characterized in that, The aeration cleaning device (6) includes an upper air pipe and a lower air pipe arranged on the mounting rack (1). The upper air pipe communicates with a plurality of upper branch pipes, and the lower air pipe communicates with a plurality of lower branch pipes. Each upper branch pipe is provided with an aeration head with a variable spraying direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable spraying direction corresponding to the bottom cleaning port (15). The aeration head provides the functions of aeration in the pool, flushing the outer surface of the membrane, and flushing the inner surface of the membrane.

8. An automatic cleaning method using the dynamic membrane module with an automatic cleaning system according to any one of claims 1 - 7, characterized in that, It includes the following steps: Step 1: Real-time detect the effluent turbidity of the dynamic membrane module and feedback the detection result to the control unit; Step 2: The control unit compares the real-time detected effluent turbidity with the preset turbidity X to determine whether to start the automatic cleaning mode: If the effluent turbidity ≥ the preset turbidity X, start the automatic cleaning mode: The driving device (5) drives the bottom cover (4) to open the bottom cleaning port (15); The aeration cleaning device (6) is started, and the inner surface of the membrane is flushed through the bottom cleaning port (15), or the inner surface and the outer surface of the membrane are flushed; After the automatic cleaning is completed, the driving device (5) drives the bottom cover (4) to close the bottom cleaning port (15); If the effluent turbidity < the preset turbidity X, the aeration cleaning device (6) provides the function of aeration in the pool.

9. The automatic cleaning method according to claim 8, characterized in that, The top of the membrane frame (2) is also provided with a top cover (3) and at least one top cleaning port; When the control unit starts the automatic cleaning mode, the driving device (5) drives the top cover (3) to open the top cleaning port, and the aeration cleaning device (6) flushes the inner surface of the membrane through the top cleaning port; After the automatic cleaning is completed, the driving device (5) drives the top cover (3) to close the top cleaning port.

10. The automatic cleaning method according to claim 9, characterized in that, The aeration cleaning device (6) includes an upper air pipe and a lower air pipe arranged on the mounting rack (1). The upper air pipe communicates with a plurality of upper branch pipes, and the lower air pipe communicates with a plurality of lower branch pipes. Each upper branch pipe is provided with an aeration head with a variable spraying direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable spraying direction corresponding to the bottom cleaning port (15); When the control unit starts the automatic cleaning mode, the aeration heads of the upper branch pipes flush the inner surface of the membrane synchronously up and down or alternately up and down through the top cleaning port, and the aeration heads of the lower branch pipes flush the inner surface of the membrane through the bottom cleaning port (15); or the control unit adjusts the spraying direction of the aeration heads to flush both the inner surface and the outer surface of the membrane.

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