A dynamic membrane module with automatic cleaning system and automatic cleaning method thereof

Abstract

A dynamic membrane module with an automatic cleaning system and a cleaning method thereof. The dynamic membrane module includes a mounting frame, a membrane frame for fixing the membrane, and an automatic cleaning system. The membrane frame and the automatic cleaning system are detachably fixed to the mounting frame. The membrane frame has two outer surfaces that respectively fix the membrane, so that the membrane frame and the membrane together enclose an internal space. The bottom of the membrane frame is provided with a bottom cover and at least one bottom cleaning port that communicates with the internal space, and the bottom cleaning port is opened or closed by the bottom cover. The automatic cleaning system includes a drive device, an aeration cleaning device, and a control unit. The drive device is used to drive the bottom cover to open or close the bottom cleaning port. The aeration cleaning device is used to flush the inner surface of the membrane when the bottom cleaning port is opened. The control unit is respectively connected to the drive device and the aeration cleaning device and controls the operating status of the drive device and the aeration cleaning device according to the membrane detection results. The present invention can aerate and clean the inner and outer surfaces of the membrane without disassembly, reducing the risk of membrane wear.

Description

Technical Field

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

[0002] The core components of dynamic membrane modules can achieve solid-liquid separation through selective osmosis. However, during operation, the membrane surface is susceptible to the adhesion of pollutants (such as colloids, organic matter, microorganisms, etc.), resulting in a decrease in membrane flux. Existing technologies have explored membrane cleaning technologies to varying degrees:

[0003] Invention patent application CN109775920A discloses a self-cleaning MBR integrated membrane biological treatment device. The MBR membrane assembly can be cleaned without disassembly, and includes a sedimentation tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR membrane tank, and a disinfection tank connected in sequence. The MBR membrane tank is provided with an MBR membrane group, which includes a plurality of sequentially stacked MBR membranes and a housing. The MBR membranes are fixed to the housing by a pair of support frames. Each MBR membrane is provided with a cleaning device. In actual use, a scraper driven by a sliding motor slides along a track, scraping away residue remaining on the MBR membrane to one side. This ensures that the MBR membrane is clean, and self-cleaning can be achieved without disassembling the entire MBR membrane group, with high cleaning efficiency and good results. However, the method of using a motor-driven scraper installed in the sewage for long-term cleaning not only complicates the equipment structure and has a high failure rate, but also easily damages the MBR membranes when cleaning the scraper. Therefore, the actual operating cost and risk of this invention are high.

[0004] Invention patent application CN117125820A discloses an automatic cleaning device and method for the dynamic membrane of an DMBR. The method comprises the following steps: during the anaerobic digestion process of sludge, real-time monitoring of the transmembrane pressure difference or membrane flux of the dynamic membrane assembly in the membrane zone; when the transmembrane pressure difference is ≥30kPa or the membrane flux is ≤5LMH, the automatic cleaning device of the dynamic membrane of the AnDMBR automatically operates, automatically cleaning the dynamic membrane assembly through the water column nozzle on the flushing branch pipe; when the transmembrane pressure difference is less than 30kPa or the membrane flux is greater than 5LMH, the automatic cleaning device of the dynamic membrane of the AnDMBR stops operating, and the automatic cleaning of the dynamic membrane of the AnDMBR ends. This invention can realize the automatic cleaning of the dynamic membrane of the AnDMBR, solve the problem of excessive thickness of the dynamic membrane caused by operating the AnDMBR at high sludge concentration, avoid the safety risks and operational complexity associated with cleaning the cover, and maintain the long-term stable operation of the AnDMBR. However, the nozzle of this invention is set in the membrane frame and is only used for cleaning flat membranes, so its compatibility is insufficient. In addition, only one diaphragm can be set for each flat membrane to ensure the comprehensive flushing effect of the nozzle on the diaphragm, resulting in a large number of flat membranes, a complex overall structure, and a large occupied volume.

[0005] 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

[0006] In response to 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. Through the overall optimized structural design of the membrane frame diaphragm, mounting frame and automatic cleaning system and the matching combination of components, the technical problems of high cost of disassembly and cleaning of the dynamic membrane module diaphragm, incomplete cleaning, complex structure and insufficient durability are solved.

[0007] 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 the membrane, and an automatic cleaning system;

[0008] The membrane frame and automatic cleaning system are detachably fixed on the mounting frame;

[0009] Membranes are fixed on the two outer surfaces of the membrane frame, so that the membrane frame and the membrane together enclose an internal space. A bottom cover and at least one bottom cleaning port communicating with the internal space are provided at the bottom of the membrane frame, and the bottom cleaning port is opened or closed by the bottom cover.

[0010] Automatic cleaning system, including a driving device, an aeration cleaning device and a control unit;

[0011] A driving device, used for driving the bottom cover to open or close the bottom cleaning port;

[0012] an aeration cleaning device, used for flushing the inner surface of the membrane when the bottom cleaning port is opened on the bottom cover;

[0013] 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.

[0014] The present invention breaks through the technical limitations of traditional dynamic membrane modules, such as complex structures, low cleaning efficiency, and cumbersome maintenance, through a modular detachable architecture, a bottom cover, and an aeration and 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 to the diaphragm clamping method of the prior art, while maintaining 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, directionally stripping away pollutants in the membrane pores, enabling the aforementioned three-dimensional enclosure design to operate stably for a long time, and combined with a simple cleaning action on the outer surface of the diaphragm, it can quickly restore the filtration efficiency of the membrane. In addition, the control unit automatically triggers the cleaning process based on real-time pollution detection, optimizes the working sequence of the drive device and the aeration and 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.

[0015] Furthermore, the control unit controls the working states of the driving device and the aeration and cleaning device according to the membrane detection result, including:

[0016] The turbidity of the outlet water of the dynamic membrane module is detected in real time by a turbidity detector, and the detection results are fed back to the control unit;

[0017] The control unit compares the real-time detected outlet water turbidity with the preset turbidity X to determine whether to start the automatic cleaning mode:

[0018] If the outlet water turbidity ≥ the preset turbidity X, start the automatic cleaning mode:

[0019] The driving device drives the bottom cover to open the bottom cleaning port;

[0020] The aeration cleaning device is started to flush the inner surface of the membrane through the bottom cleaning port, or the inner and outer surfaces of the membrane are flushed;

[0021] After the automatic cleaning is completed, the driving device drives the bottom cover to close the bottom cleaning port;

[0022] If the effluent turbidity is less than the preset turbidity X, the aeration cleaning device provides aeration in the pool.

[0023] Furthermore, a top cover and at least one top cleaning port connected to the internal space are provided on the top of the membrane frame. The driving device drives the top cover to open or close the top cleaning port. The aeration cleaning device flushes the inner surface of the membrane when the top cover opens the top cleaning port.

[0024] Optionally, the top cover opens the top cleaning port and the bottom cover opens the bottom cleaning port simultaneously, and the top cover closes the top cleaning port and the bottom cover closes the bottom cleaning port simultaneously.

[0025] On the basis that the bottom cover, bottom cleaning port and aeration cleaning device can basically complete the cleaning of the inner surface of the diaphragm and the discharge of sewage and dirt, a top cover and a top cleaning port are added. Through synchronous or step-by-step opening and closing strategies, a flexible upper and lower bidirectional flushing flow channel is constructed to adapt to the cleaning needs of different pollution levels, which is conducive to reducing the unidirectional flushing loss of the diaphragm and improving the cleaning efficiency. In the closed cover stage, the effective closure of the top and bottom covers to the membrane frame can ensure the system sealing 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 and operation and maintenance convenience, providing efficient and reliable technical support for diversified sewage treatment scenarios.

[0026] Correspondingly, when the bottom cover and bottom cleaning port, top cover and top cleaning port are set, if the outlet water turbidity ≥ the preset turbidity X, the automatic cleaning mode is started, including:

[0027] The driving device drives the top cover to open the top cleaning port, and drives the bottom cover to open the bottom cleaning port;

[0028] The aeration cleaning device is started to flush the inner surface of the membrane through the top cleaning port and the bottom cleaning port, or the control unit adjusts the spray direction of the aeration head to flush both the inner and outer surfaces of the membrane;

[0029] 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.

[0030] 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;

[0031] The driving device includes a power unit, an upper crossbar connected to the top cover, and a lower crossbar connected to the bottom cover;

[0032] The power unit drives the upper crossbar to move upward to drive the top cover to rotate to open the top cleaning port, and drives the lower crossbar to move downward to drive the bottom cover to rotate to open the bottom cleaning port;

[0033] The driving device also 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 rotates the top cover downward to close the top cleaning port, and the bottom cover reset member rotates the bottom cover upward to close the bottom cleaning port.

[0034] The present invention realizes the fully automatic synchronous / step-by-step opening and closing operation of the top cover and the bottom cover through the coordinated control mechanism of the power unit and the reset member.

[0035] Preferably, the top cover opens the top cleaning port and the bottom cover opens the bottom cleaning port simultaneously, and the top cover closes the top cleaning port and the bottom cover closes the bottom cleaning port simultaneously.

[0036] The power unit of the present invention adopts a modular drive design, and can choose from a variety of power sources such as motor drive, cylinder drive, and hydraulic drive. Through replaceable transmission schemes such as pulley-rope transmission, gear rack engagement, or screw linear transmission, the power output is converted into the synchronous opening and closing action of the top cover and the bottom cover; the gear / screw transmission accurately controls the opening and closing angle through rotational motion, which is suitable for high-precision cleaning scenarios, and when multiple groups of parallel parallel membrane frames are configured on the mounting frame, each top cover and bottom cover can be mechanically synchronized through linkage mechanisms such as upper cross bars and lower cross bars, and driven to open and close in batches by a single power unit, ensuring the uniformity of the cleaning sequence of multiple membrane groups. While improving the thoroughness of the removal of pollutants in the membrane pores, it significantly reduces the operation and maintenance complexity of the multi-component system and expands the large-scale application capability of the equipment.

[0037] Preferably, the top cover reset member and the bottom cover reset member preferably adopt a spring structure to provide a restoring force.

[0038] Furthermore, sealing members are provided on the inner wall of the top cover facing the top of the membrane frame and on the inner wall of the bottom cover facing the bottom of the membrane frame, which are used to fill the gap 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, thereby improving the overall sealing and filtering effect of the membrane frame. The sealing member can be made of rubber material, which has both elasticity, sealing and durability.

[0039] Furthermore, 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 passing around a first fixed pulley. The upper cross bar and the lower cross bar are fixedly connected by a second rope passing around a second fixed pulley. The first fixed pulley is fixed on the top of the mounting frame, and the second fixed pulley is fixed on the bottom of the mounting frame.

[0040] The dynamic membrane assembly of the present invention realizes 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 retract, and the upper cross bar is pulled upward by the first fixed pulley and the first rope, driving the top cover to flip upward around the hinge axis to open the top cleaning port; at the same time, the second fixed pulley and the second rope link the lower cross bar to move downward, pulling the bottom cover to flip downward around the hinge axis to open the bottom cleaning port. In this process, the rigid conduction of the rope and the direction-changing effect of the fixed pulley ensure the stability of the synchronous action of the top / bottom cover. Furthermore, the top cover reset member includes a top cover reset spring, the upper end of which is connected to the inner wall of the top cover, and the lower end is fixed to the membrane frame or the mounting frame. In the vertical direction, the fixed position of the lower end of the top cover reset spring is lower than the top cover;

[0041] 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 to the membrane frame or the mounting bracket. In the vertical direction, the fixed position of the upper end of the bottom cover reset spring is higher than the bottom cover.

[0042] The lower end of the top cover reset spring is preferably fixed on the membrane frame, and the upper end of the bottom cover reset spring is preferably fixed on the membrane frame, for example, by being connected to the membrane frame through a support fixed on the membrane frame, so that the top cover reset member and the bottom cover reset member are fixed on the membrane frame as a whole and can be moved, 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 and the mounting frame in advance.

[0043] During cleaning, the top cover is opened, causing the top cover return spring to be stretched and accumulate restoring force. The bottom cover is opened, causing the bottom cover return spring to be stretched and accumulate restoring force. When cleaning is complete, the motor reverses to release the rope tension, and the restoring force of the top cover return spring plus the gravity of the top cover causes the top cover to rotate and close. The restoring force of the bottom cover return spring pulls the bottom cover upward, overcoming its own weight, and the bottom cover rotates and resets to close. Using spring stretching to provide restoring force simplifies the structure of the reset element and allows for repeated reset operations. Even if it is installed in wastewater for a long time, it will not lose much and is easy to replace. In addition, to prevent the stainless steel spring from wearing the diaphragm and membrane frame, it is also preferred to use a rope to replace the contact area between the reset element and the diaphragm and membrane frame, that is, to form a discontinuous spring and rope combination reset element, but it must be ensured that it can provide sufficient restoring force for the top and bottom covers.

[0044] Furthermore, the dynamic membrane module comprises a plurality of membrane frames fixed in parallel on a mounting frame, each membrane frame being provided with a top cover and a bottom cover, each top cover being synchronously driven to open or close by a driving device, and each bottom cover (4) being synchronously driven to open or close by a driving device (5).

[0045] For a multi-diaphragm frame parallel structure, the crossbars of all top and bottom covers are driven in series by the same power unit, achieving synchronized opening and closing control. Flexible connections are used between each top cover and the upper crossbar, and between each bottom cover and the lower crossbar. These connections can be made using ropes, springs, or other connection methods. This means that when the upper crossbar moves upward and the lower crossbar moves downward, the top cover hinged at the top of the membrane frame is not affected, nor is the bottom cover hinged at the bottom of the membrane frame affected. Furthermore, the closing of the top and bottom covers is not affected.

[0046] Furthermore, the aeration and cleaning device includes an upper air pipe and a lower air pipe arranged on a mounting frame, the upper air pipe is connected to multiple upper branch pipes, and the lower air pipe is connected to multiple lower branch pipes. Each upper branch pipe is provided with an aeration head with a variable injection direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable injection direction corresponding to the bottom cleaning port. The aeration head provides aeration function in the pool, flushing function on the outer surface of the diaphragm, and flushing function on the inner surface of the diaphragm.

[0047] In a second aspect, the present invention provides an automatic cleaning method using the dynamic membrane module with the automatic cleaning system, comprising the following steps:

[0048] Step 1: Real-time detection of the turbidity of the water outlet from the dynamic membrane module, and feedback of the detection results to the control unit;

[0049] Step 2: The control unit compares the real-time detected outlet turbidity with the preset turbidity X to determine whether to start the automatic cleaning mode:

[0050] If the outlet water turbidity ≥ the preset turbidity X, start the automatic cleaning mode:

[0051] The driving device drives the bottom cover to open the bottom cleaning port;

[0052] The aeration cleaning device is started to flush the inner surface of the membrane through the bottom cleaning port, or the inner and outer surfaces of the membrane are flushed;

[0053] After the automatic cleaning is completed, the driving device drives the bottom cover to close the bottom cleaning port;

[0054] If the effluent turbidity is less than the preset turbidity X, the aeration cleaning device provides aeration in the pool.

[0055] Testing the turbidity of the effluent from the dynamic membrane module is a direct and effective method, providing a more intuitive indication of the cleaning requirements. The preset turbidity value, X, can be between 5 and 12 NTU, preferably between 6 and 10 NTU. Furthermore, it is feasible to determine whether to initiate the automatic cleaning mode by monitoring the aerobic tank level and other parameters, such as membrane flux. However, extensive experiments have shown that testing and controlling effluent turbidity is a more effective and convenient method.

[0056] When the membrane frame is only provided with a bottom cover and at least one bottom cleaning port, the aeration and cleaning device only needs to be provided with a lower air pipe, which is connected to multiple lower branch pipes. Each lower branch pipe is provided with an aeration head with a variable injection direction corresponding to the bottom cleaning port, and the flushed sewage and dirt are discharged from the bottom cleaning port.

[0057] Furthermore, when the membrane frame is provided with a bottom cover and at least one bottom cleaning port, a top cover and at least one top cleaning port are further provided on the top;

[0058] 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.

[0059] Furthermore, the aeration and cleaning device includes an upper air pipe and a lower air pipe arranged on a mounting frame, the upper air pipe is connected to a plurality of upper branch pipes, the lower air pipe is connected to a plurality of lower branch pipes, each upper branch pipe is provided with an aeration head with a variable spray direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable spray direction corresponding to the bottom cleaning port;

[0060] When the control unit starts the automatic cleaning mode, the drive device drives the top cover to open the top cleaning port and drives the bottom cover to open the bottom cleaning port. The aeration head of the upper branch pipe flushes the inner surface of the diaphragm synchronously or alternately through the top cleaning port and the aeration head of the lower branch pipe flushes the inner surface of the diaphragm through the bottom cleaning port. The flushed sewage and dirt are discharged from the bottom cleaning port; alternatively, the control unit adjusts the spray direction of the aeration head to flush both the inner and outer surfaces of the diaphragm.

[0061] Furthermore, 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;

[0062] When the control unit starts the automatic cleaning mode, the power unit drives the top cover to open the top cleaning port and drives the bottom cover to open the bottom cleaning port at the same time; 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.

[0063] If the turbidity of the outlet water of the dynamic membrane module still cannot meet the requirements after cleaning, the transmembrane pressure difference TMP or membrane flux and other parameters of each membrane frame / diaphragm of the dynamic membrane assembly can be tested. According to the test results, it can be determined whether manual inspection / cleaning / replacement is required to avoid the performance degradation of the diaphragm of a certain membrane frame, which requires other diaphragms to compensate for its function. At the beginning, the overall performance of the system is not obviously degraded, but the problem of a single diaphragm may be masked, which leads to a rapid decline in the overall performance of the system, unqualified outlet turbidity, and an increase in the frequency of overall automatic cleaning, which increases operating costs and reduces the service life of other membrane frames and diaphragms.

[0064] Furthermore, pressure sensors are provided on both sides (water inlet side and water outlet side) of each membrane frame to independently detect the water inlet pressure and the water outlet pressure of each membrane frame. Optionally, pressure sensors are provided on both sides of each diaphragm to independently detect the water inlet pressure and the water outlet pressure of each diaphragm. Each pressure sensor is connected to the control unit. Preferably, at least two pressure sensors are provided on each side, and more preferably at least three pressure sensors are provided. For example, when two pressure sensors are provided, they can be provided up and down along the height direction of the diaphragm. When three pressure sensors are provided, they can be provided in the middle and down along the height direction of the diaphragm. When five pressure sensors are provided, they can be provided in the four corners and the middle area of ​​the diaphragm, so as to obtain an average pressure value and avoid frequent disassembly, inspection, and maintenance work due to excessive errors.

[0065] The control unit calculates the TMP of the membrane frame / diaphragm based on TMP = average pressure on the water inlet side - average pressure on the water outlet side;

[0066] The control unit compares the TMP calculation result with the set threshold to determine whether the corresponding membrane frame / diaphragm should be manually inspected. If the TMP calculation result exceeds the set threshold, the membrane frame / diaphragm is determined to be at risk of damage, indicating that manual inspection is required. The membrane frame will be removed from the mounting rack for inspection. Optionally, if the diaphragm on the membrane frame is physically intact and has no obvious damage, it can be manually cleaned (such as chemically) and then re-inspected. If it still cannot be restored to a usable range, the damaged diaphragm (single or double) on the membrane frame will be replaced. The set threshold is approximately 20-50kPa, preferably 25-35kPa, and is specifically adjusted according to the selected initial parameters of the membrane frame and diaphragm and the actual operating conditions (such as flow rate, temperature, etc.).

[0067] In actual operation, pressure sensors are often installed on both sides of the membrane frame to monitor the two diaphragms together. Once a damage warning signal appears, the staff also needs to dismantle the entire membrane frame that fixes the two diaphragms for inspection. Therefore, based on cost and maintenance considerations, pressure sensors are installed on both sides of the membrane frame to detect the transmembrane pressure difference.

[0068] The present invention has at least the following beneficial effects:

[0069] (1) Traditional dynamic membrane modules have a strong closed frame and rely on manual disassembly and assembly, which makes it difficult for the cleaning medium to reach the deep inner area of ​​the membrane, and the maintenance efficiency is low. The present invention adopts an open design at the bottom of the membrane frame, especially when multiple cleaning ports are designed on 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 drive device, so that the top cover and the bottom cover are synchronously opened and closed in opposite directions (the top cover is flipped up and the bottom cover is flipped down) under the drive of the power unit, completely exposing the inner and outer surfaces of the membrane. This design breaks through the spatial restrictions of the traditional closed or semi-closed frame on the cleaning medium, allowing water or air flow to penetrate along the axial direction of the membrane, preferably in two directions, effectively eliminating the cleaning blind spot. At the same time, the cooperation between the spring return member and the power unit realizes the self-locking and rapid reset of the opening and closing action, transforming the manual operation link into a fully automatic control process, significantly shortening the maintenance cycle and reducing the complexity of operation.

[0070] (2) In order to address the problems of residual pollutants and secondary leakage in the membrane pores caused by the single spray angle and limited coverage of fixed aeration heads in the prior art, the present invention achieves a double breakthrough in cleaning efficiency and system sealing through a hierarchical layout design with a mandatory lower air path and an optimal upper air path, combined with the coordinated control of a variable-direction aeration head. While ensuring basic cleaning capabilities, the hierarchical air path design achieves a dynamic balance between multiple cleaning modes and energy consumption and cleaning intensity by starting and stopping each air path on demand, effectively extending the service life of the membrane and reducing maintenance costs.

[0071] (3) Traditional systems are difficult to adapt to differentiated pollution scenarios due to the lack of real-time monitoring and independent control units, which can easily lead to insufficient cleaning or waste of resources. The present invention sets a turbidity sensor module, an optional transmembrane pressure difference or membrane flux detection module and matches it with the drive-aeration linkage control logic. It can dynamically trigger the cleaning strategy according to changes in water quality, and adaptively adjust the cleaning method, intensity and duration to extend the service life of each diaphragm, membrane frame, etc. and the dynamic membrane module. In addition, in the parallel design, each membrane frame is connected to the drive cross bar and the reset spring, which is conducive to batch operation to improve cleaning efficiency and reduce energy consumption. This architecture enables the system to have both efficient cleaning capabilities and diversified and large-scale processing adaptability, significantly expanding the application range of dynamic membrane modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0073] Figure 1 This is a schematic structural diagram of the dynamic membrane module of the present invention;

[0074] Figure 2 This is a schematic structural diagram of a dynamic membrane module without a membrane according to the present invention;

[0075] Figure 3 It is a structural schematic diagram of the membrane frame of the present invention;

[0076] Figure 4 It is a structural schematic diagram of the bottom of the membrane frame of the present invention.

[0077] Explanation of the accompanying drawings: 1-mounting frame, 2-membrane frame, 3-top cover, 4-bottom cover, 5-driving device, 6-aeration and 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-pressure plate. DETAILED DESCRIPTION

[0078] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0079] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "an," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0080] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0081] like Figure 1-4 As shown, the present invention provides a dynamic membrane module with an automatic cleaning system, including a mounting frame, a membrane frame for fixing the membrane, and an automatic cleaning system. The specific structure is as follows:

[0082] (1) The mounting frame 1, the membrane frame 2 and the automatic cleaning system are detachably fixed on the mounting frame 1. The specific configuration of the mounting frame 1 is not unique. For example, a cubic frame structure is adopted to facilitate the insertion and removal of the membrane frame 2 with a fixed cubic structure, and also facilitate stable placement and flexible use;

[0083] (2) The film frame 2 is preferably made of stainless steel and is designed as a hollow quadrilateral frame structure, similar to a screen window frame. The film frame 2 includes a bottom cover 4 hinged to the bottom and at least one bottom cleaning port 15, which is opened or closed by the bottom cover 4. More preferably, 1 to 5 bottom cleaning ports 15 are provided along the length of the bottom of the film frame, see Figure 4 ;

[0084] Preferably, the film frame 2 is further provided with a top cover 3 hinged to the top and at least one top cleaning port. The structure and setting method 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 provided along the length direction of the top of the film frame.

[0085] The diaphragms are fixed on the two outer surfaces of the membrane frame 2 respectively. The two diaphragms are fixed relatively parallel to and clamp the membrane frame 2. The membrane frame 2 and the two diaphragms together enclose the internal space. Multiple pressing plates 16 press and fix the diaphragms along the edges of the outer surfaces of the membrane frame 2. The pressing plates 16 can be made of stainless steel.

[0086] The top cleaning port and the bottom cleaning port 15 connect the internal space enclosed by the membrane frame 2 and the membrane to 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, thereby opening the internal space in a controlled manner.

[0087] Rubber seals can be provided 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 to fill the gap 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, thereby better sealing the top cleaning port and the bottom cleaning port 15.

[0088] Multiple membrane frames 2 can be inserted side by side and fixed to the mounting frame 1. For example, 3-10 membrane frames 2, preferably 5-8, can be fixed side by side on the mounting frame 1. The top covers 3 of all membrane frames 2 are flexibly connected in parallel to the upper crossbar, and all bottom covers 4 are flexibly connected in parallel to the lower crossbar. They are synchronously driven by the same power unit 5.1, so that all top covers 3 and all bottom covers 4 can be opened synchronously. Moreover, due to the provision of a spring return member, all top covers 3 and all bottom covers 4 can be closed almost synchronously after the power unit 5.1 is released.

[0089] Each membrane frame can be equipped with online testing equipment to detect the performance of the membrane sheets in the membrane frame, so as to timely understand the wear and tear of each membrane frame and promptly deal with or replace individual membrane frames based on the test results. For example, 2-5 pressure sensors can be installed on the water inlet and water outlet sides of each membrane frame, and each pressure sensor is connected to a control unit to independently detect the water inlet and water outlet pressures of each membrane frame. The test results are fed back to the control unit to obtain the transmembrane pressure difference of each diaphragm. The status of each diaphragm is determined by comparing the detected transmembrane pressure difference with the set threshold. Pressure sensors can also be installed on both sides of each diaphragm to more accurately detect the performance of individual diaphragms.

[0090] (3) An automatic cleaning system, comprising a driving device 5, an aeration cleaning device 6 and a control unit, wherein:

[0091] (3.1) Driving device 5, comprising 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 rotate the top cover 3 to open the top cleaning port, and drives the lower crossbar 5.3 to move downward to rotate the bottom cover 4 to open the bottom cleaning port 15;

[0092] The power unit 5.1 also includes a motor fixed to 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 cross bar 5.2 by a first rope 12 passing around the first fixed pulley 9. The upper cross bar 5.2 and the lower cross bar 5.3 are fixedly connected by a second rope 13 passing around the second fixed pulley 10. The first fixed pulley 9 is fixed to the top of the mounting frame 1, and the second fixed pulley 10 is fixed to the bottom of the mounting frame 1; the motor of the power unit 5.1 drives the telescopic push rod 11 to retract, and the upper cross bar 5.2 is pulled upward by 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 link the lower cross bar 5.3 to move downward, pulling the bottom cover 4 to flip downward around the hinge axis to open the bottom cleaning port 15.

[0093] The driving device 5 further includes a top cover 3 reset member connected to the top cover 3 and a bottom cover 4 reset member connected to the bottom cover 4. The top cover 3 reset member rotates the top cover 3 downward to close the top cleaning port, and the bottom cover 4 reset member rotates the bottom cover 4 upward to close the bottom cleaning port 15.

[0094] The top cover reset member includes a top cover reset spring 7, the upper end of which 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. In the vertical direction, the lower end of the top cover reset spring 7 is fixed at a position lower than the top cover 3. The bottom cover reset member 4 includes a bottom cover reset spring 8, the lower end of which is connected to the inner wall of the bottom cover 4 and the upper end is fixed to the membrane frame 2 or the mounting bracket 1. In the vertical direction, the upper end of the bottom cover reset spring 8 is fixed at a position higher than the bottom cover 4. During cleaning, the top cover is opened, causing the top cover reset spring to be stretched and accumulate restoring force. When the bottom cover is opened, the bottom cover reset spring is stretched and accumulates restoring force. When cleaning is complete, the motor runs in the reverse direction to release the rope tension. The restoring force of the top cover reset spring plus the weight of the top cover causes the top cover to rotate and close. The restoring force of the bottom cover reset spring pulls the bottom cover upward to overcome its own weight, causing the bottom cover to rotate and reset and close.

[0095] (3.2) An aeration and cleaning device 6 is provided on the upper air pipe and the lower air pipe of the mounting frame 1. The upper air pipe is connected to a plurality of upper branch pipes, and the lower air pipe is connected to a plurality of lower branch pipes. Each upper branch pipe is provided with an aeration head with a variable injection direction corresponding to the top cleaning port, and each lower branch pipe is provided with an aeration head with a variable injection direction corresponding to the bottom cleaning port 15. The aeration head provides aeration in the pool, flushing of the outer surface of the diaphragm, and flushing of the inner surface of the diaphragm.

[0096] 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 the 5 upper branch pipes and a lower air pipe connecting the 5 lower branch pipes can be provided on the mounting frame 1, and 3 aeration heads are provided corresponding to the cleaning ports of each branch pipe.

[0097] (3.3) A control unit, connected to the driving device 5 and the aeration and cleaning device 6 respectively;

[0098] The control unit starts / stops the automatic cleaning mode based on the real-time feedback results from the treatment tank detection unit and the diaphragm detection unit. When started, the power unit 5.1 is triggered, and the high-pressure airflow of the aeration and cleaning device 6 is sprayed in multiple directions from the bottom cleaning port 15 and the optional top cleaning port, thereby fully covering the inner surface of the diaphragm. After stopping, the aeration in the external tank maintains the biological reaction activity, thereby achieving seamless connection between the cleaning process and sewage treatment.

[0099] Based on the above device, the present invention provides an automatic cleaning method for a dynamic membrane module, which specifically includes the following steps:

[0100] Step 1: Detect the turbidity of the water outlet from the dynamic membrane module and feed the detection results back to the control unit;

[0101] Step 2: The control unit compares the real-time detected outlet turbidity with the preset turbidity X to determine whether to start or stop the automatic cleaning mode:

[0102] If the outlet water turbidity is greater than or equal to the preset turbidity X, which is between 5 and 12 NTU, preferably between 6 and 10 NTU, the automatic cleaning mode is activated:

[0103] The motor of the power unit 5.1 drives the telescopic push rod 11 to extend and retract, which pulls the upper cross bar 5.2 upward via the first fixed pulley 9 and the first rope 12, causing the top cover 3 to flip upward about the hinge axis to open the top cleaning port. At the same time, the second fixed pulley 10 and the second rope 13 work together to move the lower cross bar 5.3 downward, pulling the bottom cover 4 downward about the hinge axis to open the bottom cleaning port 15.

[0104] After opening the top and bottom cleaning ports 15, the aeration heads of the aeration cleaning device 6 are activated. Each aeration head flushes the inner surface of the membrane up and down synchronously or alternately at a spray intensity of 15-35 cubic meters of gas per square meter of sewage per hour for 10-60 minutes, flushing the flow channel in both directions to meet the cleaning needs of different pollution levels. The control unit can adjust the spray direction of the aeration head to flush the outer surface of the membrane. The cleaning sewage and dirt in the internal space are discharged from the bottom cleaning port 15.

[0105] Optionally, each aeration head has at least the following working modes:

[0106] Working mode 1: When using the aeration head for continuous flushing with synchronization up and down, the injection intensity can be selected to supply 24±2 cubic meters of gas per square meter of sewage per hour, for 10-45 minutes;

[0107] Working mode 2: When using the aeration head for synchronous intermittent flushing, the injection intensity can be selected to supply 30±2 cubic meters of gas per square meter of sewage per hour, with a single injection lasting 10-15 minutes, an interval of 3-5 minutes, and 2-3 injections;

[0108] Working mode 3: When the aeration heads are used for alternating flushing, the spray intensity can be selected to supply 30±2 cubic meters of gas per square meter of sewage per hour. The upper / lower aeration heads spray for 5-10 minutes at a time, and then exchange after an interval of 1-3 minutes. The upper and lower aeration heads spray 2-3 times each.

[0109] 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 different membrane frame pollution detection results; or the same or different working modes can be selected between different automatic cleanings.

[0110] 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, the top cover return spring 7 forces the top cover 3 to rotate and return to close, and the bottom cover return spring 8 forces the bottom cover 4 to rotate and return to close.

[0111] If the measured effluent turbidity is less than the preset turbidity X, the aeration cleaning device 6 provides aeration within the pool. During the initial use of the dynamic membrane module, or after automatic cleaning has satisfied requirements, the dynamic membrane module is in filtration operation, and the aeration cleaning device 6 provides aeration within the aerobic pool. At this time, the control unit can also control the aeration head based on the results of the aerobic pool test to provide aeration within the aerobic pool with controllable aeration parameters such as aeration range and aeration volume.

[0112] If the turbidity of the outlet water of the dynamic membrane module still cannot meet the requirements after cleaning, the transmembrane pressure difference TMP or membrane flux and other parameters of each membrane frame / diaphragm of the dynamic membrane assembly can be tested, and whether manual inspection / cleaning / replacement is required can be determined based on the test results.

[0113] Specifically, three pressure sensors are installed on the water inlet and outlet sides of each membrane frame. The three pressure sensors on each side are arranged in the upper, middle, and lower positions along the height of the diaphragm. Each pressure sensor is connected to a control unit. The pressure sensors detect the water inlet and outlet pressures of each membrane frame and feed the test results back to the control unit. The control unit calculates the TMP value of the membrane frame and compares the calculated TMP with a set threshold. If the TMP value of a membrane frame exceeds the set threshold, the control unit prompts that the membrane frame requires manual inspection to determine the damage to the membrane frame. Chemical cleaning is performed if necessary. If the test still fails to meet the requirements after cleaning, the fixed diaphragm of the membrane frame can be replaced.

[0114] Therefore, the dynamic membrane module with an automatic cleaning system and the automatic cleaning method of the present invention can simply and automatically clean the inner and outer surfaces of the fixed diaphragms on the membrane frames without disassembling the membrane frames in the dynamic membrane module. The spacing between the membrane frames and / or the diaphragms can be reduced as needed, increasing the number of membrane frames supported by the mounting frame and improving the filtration efficiency of the dynamic membrane module within the same space. Furthermore, based on the wear and tear of the diaphragms in each membrane frame, the diaphragms requiring maintenance can be promptly processed or replaced, thereby ensuring the overall filtration efficiency of the dynamic membrane module and effectively extending the service life of the remaining diaphragms.

[0115] The above introduces the preferred embodiments of the present invention, which is intended to make the spirit of the present invention clearer and easier to understand, and is not intended to limit the present invention. Any modifications, replacements, and improvements made within the spirit and principles of the present invention should be included in the scope of protection outlined by the claims attached to the present invention.

Claims

1. A dynamic membrane module with an automatic cleaning system, characterized in that: include: A mounting frame (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 on the mounting frame (1); Diaphragms are fixed on the two outer surfaces of the membrane frame (2) respectively, so that the membrane frame (2) and the membrane together enclose an internal space, and 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); a top cover (3) and at least one top cleaning port communicating with the internal space are also provided at the top of the membrane frame (2), and the top cover (3) opens or closes the top cleaning port; An automatic cleaning system comprising a driving device (5), an aeration cleaning device (6) and a control unit; A driving device (5) for driving the bottom cover (4) to open or close the bottom cleaning port (15), and driving the top cover (3) to open or close the top cleaning port; an aeration cleaning device (6) for flushing the inner surface of the membrane when the bottom cover (4) opens the bottom cleaning port (15) and the top cover (3) opens the top cleaning port; A control unit is connected to the driving device (5) and the aeration cleaning device (6) respectively, and controls the working states of the driving device (5) and the aeration cleaning device (6) according to the membrane detection result; Wherein, a plurality of the membrane frames (2) are fixed in parallel on the mounting frame (1), and each membrane frame (2) is correspondingly provided with a top cover (3) and a bottom cover (4), and 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 a driving device (5).

2. The dynamic membrane module according to claim 1, 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) comprises a power unit (5.1), an upper crossbar (5.2) connected to the top cover (3), and a lower crossbar (5.3) 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 driving device (5) further comprises a top cover reset member connected to the top cover (3) and a bottom cover reset member connected to the bottom cover (4), wherein 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).

3. The dynamic membrane module according to claim 2, characterized in that: The power unit (5.1) includes a motor fixed to 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 cross bar (5.2) via a first rope (12) passing around a first fixed pulley (9). The upper cross bar (5.2) and the lower cross bar (5.3) are fixedly connected via a second rope (13) passing around a second fixed pulley (10). The first fixed pulley (9) is fixed to the top of the mounting frame (1), and the second fixed pulley (10) is fixed to the bottom of the mounting frame (1).

4. The dynamic membrane module according to claim 2 or 3, 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 frame (1). In the vertical direction, 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 to the membrane frame (2) or the mounting frame (1). In the vertical direction, the fixed position of the upper end of the bottom cover reset spring (8) is higher than the bottom cover (4).

5. The dynamic membrane module according to any one of claims 1 to 3, characterized in that: The aeration and cleaning device (6) comprises an upper air pipe and a lower air pipe arranged on the mounting frame (1), the upper air pipe being connected to a plurality of upper branch pipes, the lower air pipe being connected to a plurality of lower branch pipes, each upper branch pipe being provided with an aeration head with a variable spray direction corresponding to the top cleaning port, and each lower branch pipe being provided with an aeration head with a variable spray direction corresponding to the bottom cleaning port (15), the aeration head providing aeration in the pool, flushing of the outer surface of the membrane, and flushing of the inner surface of the membrane.

6. An automatic cleaning method using the dynamic membrane module with an automatic cleaning system according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Real-time detection of the turbidity of the water outlet from the dynamic membrane module, and feedback of the detection results to the control unit; Step 2: The control unit compares the real-time detected outlet turbidity with the preset turbidity X to determine whether to start the automatic cleaning mode: If the outlet water 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), and drives the top cover (3) to open the top cleaning port; The aeration cleaning device (6) is started to flush the inner surface of the membrane through the bottom cleaning port (15) and the top cleaning port, or flush the inner and outer surfaces of the membrane; After the automatic cleaning is completed, the driving device (5) drives the bottom cover (4) to close the bottom cleaning port (15), and drives the top cover (3) to close the top cleaning port; If the turbidity of the effluent is less than the preset turbidity X, the aeration cleaning device (6) provides aeration in the pool.

7. The automatic cleaning method according to claim 6, characterized in that: The aeration and cleaning device (6) comprises an upper air pipe and a lower air pipe arranged on a mounting frame (1), the upper air pipe being connected to a plurality of upper branch pipes, the lower air pipe being connected to a plurality of lower branch pipes, each upper branch pipe being provided with an aeration head with a variable spray direction corresponding to a top cleaning port, and each lower branch pipe being provided with an aeration head with a variable spray direction corresponding to a bottom cleaning port (15); When the control unit starts the automatic cleaning mode, the aeration head of the upper branch pipe flushes the inner surface of the membrane synchronously or alternately through the top cleaning port and the aeration head of the lower branch pipe flushes the inner surface of the membrane through the bottom cleaning port (15); or, the control unit adjusts the spray direction of the aeration head to flush both the inner and outer surfaces of the membrane.

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