Ceramic composite membrane module system with high loading density and double separation paths and use method

Abstract

The invention relates to a dual-path ceramic composite membrane module system and a use method thereof, and belongs to the technical field of fluid membrane separation. Comprising a water inlet and a second water production port which are respectively formed in the upper side and the lower side of a membrane shell, and an upper filler, an upper sealing gasket, a lower sealing gasket and a lower filler are sequentially arranged in the membrane shell from top to bottom; a first water producing port is formed in the side wall of the membrane shell between the two sealing gaskets, and a concentrated water port is formed in the side wall of the membrane shell between the sealing gasket on the lower side and the filler on the lower side; the upper and lower ends of the tubular ceramic membrane component are connected with the sealing gaskets on the lower side; the upper end of the hollow fiber ceramic membrane bundle is connected with the filler on the upper side, and the lower end of the hollow fiber ceramic membrane bundle penetrates through the tubular ceramic membrane component and is connected with the filler on the lower side. According to the system, stable operation is guaranteed, and meanwhile the problems that a traditional ceramic membrane is low in filling density, narrow in working condition adaptability and high in large-scale application investment and operation and maintenance cost are solved.

Description

Technical Field

[0001] This invention relates to a dual-path ceramic composite membrane module system and its usage method, belonging to the field of fluid membrane separation technology. Background Technology

[0002] Membrane separation technology, as a highly efficient and energy-saving separation and purification method, has been widely used in advanced water treatment, industrial wastewater reuse, and biopharmaceutical purification. Ceramic membranes, with their advantages of good chemical stability, high mechanical strength, and strong resistance to fouling, have become the preferred membrane material for high-temperature, high-corrosion, and high-solids-content systems. Currently, tubular ceramic membranes, with their high mechanical strength and anti-fouling capabilities due to their single-tube structure, exhibit excellent operational stability in complex feed systems, capable of withstanding high-pressure shocks and frequent chemical cleaning, and have a significantly longer service life than other membrane types. However, limited by the hollow cavity design of the single tube, the membrane area per unit volume of the membrane module is relatively small, resulting in a large equipment footprint and high unit investment cost. This creates a significant contradiction, especially in large-scale industrial applications, where low packing density and the engineering requirements for compactness and high efficiency present a distinct challenge. Researchers have discovered that the slender membrane bundle structure of ceramic hollow fiber membranes can integrate several times the effective membrane area of ​​tubular membranes within the same volume, theoretically significantly improving the treatment efficiency per unit volume. However, ceramic hollow fiber membranes inherently suffer from weak mechanical strength, making them prone to fiber breakage and membrane bundle compaction in high-pressure or high-solids-liquid systems. Therefore, they cannot directly replace tubular ceramic membranes for complex applications. While existing technologies have attempted simple structural improvements, these have only focused on optimizing parameters for a single membrane type, failing to achieve a significant breakthrough in high packing density for ceramic membranes, and neglecting systematic design of fluid distribution and filtration paths for composite structures.

[0003] Therefore, there is an urgent need to propose a ceramic composite membrane module system with high packing density and dual separation paths, as well as its application method, to solve the above-mentioned technical problems. Summary of the Invention

[0004] To address the aforementioned problems, a high-density ceramic composite membrane module system with dual separation paths and its usage method are provided. A brief overview of the invention is given below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0005] The technical solution of this invention:

[0006] A high-density, dual-separation-path ceramic composite membrane module system includes: an inlet and a second product outlet are respectively provided on the upper and lower sides of the membrane housing; and the upper filler, the upper sealing gasket, the lower sealing gasket, and the lower filler are arranged sequentially from top to bottom inside the membrane housing. A first product water outlet is provided on the side wall of the membrane shell between the two sealing gaskets, and a concentrate outlet is provided on the side wall of the membrane shell between the lower sealing gasket and the lower filler. The upper and lower ends of the tubular ceramic membrane module are connected to the sealing gasket on the lower side; The upper end of the hollow fiber ceramic membrane bundle is connected to the upper filler, and the lower end of the hollow fiber ceramic membrane bundle passes through the tubular ceramic membrane module and is connected to the lower filler.

[0007] Preferably, it also includes: a first check valve is provided on the pipeline connecting one end of the first pressure pump to the first product water outlet, and a first pressure valve is provided on the other end of the first pressure pump; A second check valve is installed on the pipeline connecting one end of the second pressure pump to the second product outlet, and a second pressure valve is installed on the other end of the second pressure pump.

[0008] Preferably, the membrane housing is further provided with separate upper and lower end caps, the connection between the membrane housing and the end caps is filled with filler, an O-ring is provided between the membrane housing and the end caps, and the membrane housing and the end caps are connected by a flange.

[0009] Preferably, a number of tubular ceramic membrane modules are evenly arranged, and each tubular ceramic membrane module contains a hollow fiber ceramic membrane bundle.

[0010] Preferred: The tubular ceramic membrane module has a membrane flux diameter of 2-10 mm, a membrane pore size of 1-5000 nm, and the membrane material is one or more of alumina, titanium oxide, zirconium oxide, and silicon carbide. The hollow fiber ceramic membrane bundle has an inner diameter of 0.5-2 mm and a pore size of 1-1000 nm. The membrane material is one or more of alumina, titanium oxide, zirconium oxide, and silicon carbide. The potting layer is made of one or more of epoxy resin, polyurethane, and silicone rubber, and the potting layer thickness is 20-40mm.

[0011] A method for using a high-density dual-separation-path ceramic composite membrane module system, comprising: The membrane filtration water production stage includes single-path separation and dual-path synergistic separation; Backwashing stage.

[0012] Preferred: The membrane filtration permeate stage includes: Single-path separation includes: Step D1: Raw water enters the membrane housing through the inlet. The water inlet rate is adjusted so that the ratio of the effective water inlet volume to the water inlet rate is the set hydraulic residence time. Step D2: Start the first or second pressure pump to drive the corresponding water production power unit to produce water output; Step D3: Wastewater inside the membrane housing completes membrane filtration separation: one path is that the wastewater passes through the membrane wall of the tubular ceramic membrane module and enters the tubular membrane permeate outlet; or another path is that the wastewater passes through the membrane wall of the hollow fiber ceramic membrane bundle and enters the hollow fiber membrane permeate outlet, driving the corresponding permeate power unit to produce water output. Step D4: The concentrate is discharged from the system through the concentrate outlet.

[0013] Preferred: Dual-path collaborative separation includes: Step S1: Raw water enters the membrane housing through the inlet. The water inlet rate is adjusted so that the ratio of the effective water inlet volume to the water inlet rate is the set hydraulic residence time. Step S2: Start the first pressure pump and the second pressure pump to drive the two water production power units to produce water output respectively; Step S3: Wastewater inside the membrane housing undergoes membrane filtration separation through two paths simultaneously: one path is for wastewater to pass through the membrane wall of the tubular ceramic membrane module and enter the tubular membrane permeate outlet, and the other path is for wastewater to pass through the membrane wall of the hollow fiber ceramic membrane bundle and enter the hollow fiber membrane permeate outlet, thereby driving two permeate power units to produce water output. Step S4: The concentrate is discharged from the system through the concentrate outlet.

[0014] Preferred: The backwashing stage includes the following steps: Step R1: Stop the raw water intake process through the inlet, shut down the first pressure pump and the second pressure pump, and cut off the water flow channel during the stable water production stage; Step R2: Connect the backwash water source to the tubular membrane product inlet and the hollow fiber membrane product inlet, start the first pressure pump, drive the backwash water source to pass through the membrane wall of the tubular ceramic membrane module in reverse and enter the feed chamber to flush the contaminants attached to the outer wall of the tubular membrane; at the same time, start the second pressure pump, drive the backwash water source to pass through the membrane wall of the hollow fiber ceramic membrane bundle in reverse and enter the feed chamber to flush the contaminants attached to the outer wall of the fiber membrane bundle, and discharge the backwash wastewater through the concentrate outlet of the system; Step R3: By adjusting the opening of the first pressure valve and the second pressure valve, synchronous backwashing or individual backwashing of the two water production power units can be achieved; during individual backwashing, the first pressure pump or the second pressure pump can be started as needed to complete the flushing of the corresponding water production unit path. Step R4: After backwashing is completed, close the backwash pipeline valve, start the first pressure pump and the second pressure pump to purge for a short time to discharge the backwash wastewater remaining in the membrane housing; then restore the water inlet flow and switch back to the stable water production stage.

[0015] Preferably, the pressure ratio of the two water production power units is controlled within the range of 1:5 to 5:1. By adjusting the opening of the pressure valves of each path, it is possible to open path one alone, open path two alone, or operate the two paths in coordination to meet different pollutant separation requirements.

[0016] The present invention has the following beneficial effects: 1. This invention, through the composite integrated design of tubular ceramic membrane modules and hollow fiber ceramic membrane bundles, greatly increases the membrane area packing density of the membrane module system compared to a single tubular ceramic membrane module. Under the same processing capacity requirements, it effectively reduces the equipment volume and floor space, thereby reducing the investment cost for large-scale applications. 2. Based on two independent water production power units and pressure regulation design, this invention can flexibly switch the operating mode according to the characteristics of pollutant concentration, solid content, particle size and other characteristics of the feed liquid, adapt to different working conditions such as high pressure and high solids, low pollution and large treatment capacity, and broaden the application range of ceramic membrane modules. 3. The sealing components of this invention are encapsulated with high-temperature resistant ceramic potting compound, combined with a check valve and precise pressure control, which ensures the sealing performance and operational stability of the system under high pressure and high temperature conditions; the synchronous or separate backwashing function can specifically remove contaminants on the surface of the membrane module, reduce membrane fouling accumulation, and extend the service life of the membrane module. 4. The present invention improves the unit energy consumption processing efficiency through dual-path collaborative operation, avoids ineffective energy consumption through single-path independent operation, and the backwashing process does not require complex chemical cleaning processes, reducing the consumption of reagents and the workload of operation and maintenance, thus reducing long-term operation and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high packing density dual separation path ceramic composite membrane module system of the present invention.

[0018] Figure 2 This is a schematic diagram of the AA cross-section structure of the high packing density dual separation path ceramic composite membrane module system of the present invention.

[0019] Figure 3 This is a BB cross-sectional diagram of the high packing density dual separation path ceramic composite membrane module system of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0021] Specific implementation method one: Combining Figure 1 This embodiment describes a high-density dual-separation-path ceramic composite membrane module system. The present invention provides an improved membrane module system, comprising: a tubular ceramic membrane module 5, a hollow fiber ceramic membrane bundle 6, a membrane shell 7, a filler 8, and a sealing gasket 9. like Figure 1 The membrane housing 7 is provided with an inlet 1 and a second product water outlet 4 on its upper and lower sides respectively. The second product water outlet 4 is a hollow fiber membrane product water outlet. Inside the membrane housing 7, from top to bottom, there are upper filler 8, upper sealing gasket 9, lower sealing gasket 9, and lower filler 8. The filler 8 is resin. A first product water outlet 2 is provided on the side wall of the membrane shell 7 between the two sealing gaskets 9, and a concentrate outlet 3 is provided on the side wall of the membrane shell 7 between the lower sealing gasket 9 and the lower filler 8. The first product water outlet 2 is a tubular membrane product water outlet, and the concentrate outlet 3 is a wastewater outlet. The upper and lower ends of the tubular ceramic membrane module 5 are fixedly connected to the sealing gasket 9 on the lower side, and the central hole of the tubular ceramic membrane module 5 is connected to the inlet 1 and the concentrate outlet 3. The upper end of the hollow fiber ceramic membrane bundle 6 is fixedly connected to the upper filler 8, and the lower end of the hollow fiber ceramic membrane bundle 6 passes through the tubular ceramic membrane module 5 and is fixedly connected to the lower filler 8. The central hole of the hollow fiber ceramic membrane bundle 6 is not connected to the inlet 1, and the lower side of the central hole of the hollow fiber ceramic membrane bundle 6 passes through the lower filler 8 and is connected to the second product water outlet 4. This invention, through the composite integrated design of the tubular ceramic membrane module and the hollow fiber ceramic membrane bundle, greatly increases the membrane area packing density of the membrane module system compared to a single tubular ceramic membrane module. Under the same treatment capacity requirements, it effectively reduces the equipment volume and floor space, and lowers the investment cost for large-scale applications. Water sequentially passes through inlet 1, the side wall of tubular ceramic membrane module 5, and the first product water outlet 2 to form the first product water path. Water sequentially passes through inlet 1, the side wall of hollow fiber ceramic membrane bundle 6, and the second product water outlet 4 to form the second product water path. Water can pass through in reverse to achieve backwashing. Water sequentially passes through inlet 1, the area between the side wall of tubular ceramic membrane module 5 and the side wall of hollow fiber ceramic membrane bundle 6, and the concentrate outlet 3 to form the sewage discharge path. Relying on two independent product water power units and pressure regulation design, the operating mode can be flexibly switched according to the characteristics of pollutant concentration, solid content, particle size, etc. of the feed liquid, adapting to different working conditions such as high pressure and high solids, low pollution and large treatment capacity, thus broadening the application range of ceramic membrane modules.

[0022] Specific Implementation Method Two: Combining Figure 1-3 This embodiment of the high packing density dual separation path ceramic composite membrane module system further includes: a first check valve 12, a first pressure pump 13, a first pressure valve 14, a second check valve 15, a second pressure pump 16, and a second pressure valve 17. A first check valve 12 is provided on the pipeline connecting one end of the first pressure pump 13 to the first water outlet 2, and a first pressure valve 14 is provided on the other end of the first pressure pump 13. A second check valve 15 is installed on the pipeline connecting one end of the second pressure pump 16 to the second water outlet 4, and a second pressure valve 17 is installed on the other end of the second pressure pump 16. The pressure control component includes two independent pressure valves, each corresponding to one of the two water production power units. It can monitor and adjust the water production side pressure of each path in real time, and accurately control the pressure ratio error within ±0.05 MPa. This invention provides two pathways: one through the wall of a tubular ceramic membrane to the permeate outlet, and the other through the outer wall of a hollow fiber membrane to the inner wall to the corresponding permeate outlet. Single / dual pathway switching is achieved by adjusting two pressure valves, with simultaneous or individual backwashing functionality. This system ensures stable operation while solving the problems of low packing density, narrow adaptability to operating conditions, and high investment and maintenance costs for large-scale applications of traditional ceramic membranes.

[0023] Specific implementation method three: Combining Figure 1-3 This embodiment of the high packing density dual separation path ceramic composite membrane module system further includes: flange 10 and O-ring 11; For convenient installation, the membrane housing 7 is equipped with separate upper and lower end caps. The connection between the membrane housing 7 and the end caps is filled with filler material 8. The filler material 8 and the sealing gasket 9 position and seal the internal membrane module. An O-ring 11 is provided between the membrane housing 7 and the end caps. The membrane housing 7 and the end caps are connected by a flange 10. The sealing components are potted with high-temperature resistant ceramic potting compound. Combined with a check valve and precise pressure control, the sealing performance and operational stability of the system under high pressure and high temperature conditions are guaranteed. The synchronous or separate backwashing function can specifically remove contaminants on the surface of the membrane module, reduce membrane fouling accumulation, and extend the service life of the membrane module.

[0024] Specific implementation method four: Combination Figure 1-3 This embodiment describes a high-density dual-separation-path ceramic composite membrane module system. Several tubular ceramic membrane modules 5 are uniformly arranged, and each tubular ceramic membrane module 5 contains several uniformly arranged hollow fiber ceramic membrane bundles 6. A first mounting through-hole corresponding to the central hole of the tubular ceramic membrane module 5 is provided on the sealing gasket 9, and a second mounting through-hole corresponding to the central hole of the hollow fiber ceramic membrane bundle 6 is provided on the filler 8.

[0025] Specific Implementation Method Five: Combining Figure 1-3 This embodiment describes a high-density dual-separation-path ceramic composite membrane module system. The tubular ceramic membrane module 5 has a membrane flux diameter of 2-10 mm and a membrane pore size of 1-5000 nm. The membrane material is one or more of alumina, titanium oxide, zirconium oxide, and silicon carbide. The hollow fiber ceramic membrane bundle 6 has an inner diameter of 0.5-2 mm and a membrane pore size of 1-1000 nm. The membrane material is one or more of alumina, titanium oxide, zirconium oxide, and silicon carbide. The potting layer is made of one or more of epoxy resin, polyurethane, and silicone rubber, and the potting layer thickness is 20-40mm. The membrane area packing density of the membrane module system is 50%-200% higher than that of a single tubular ceramic membrane module.

[0026] Specific Implementation Method Six: Combination Figure 1-3 This embodiment describes the method of using the high-packing-density dual-separation-path ceramic composite membrane module system. The system comprises: The membrane filtration water production stage includes single-path separation and dual-path synergistic separation; the fluid flow directions of the two water production power units are as follows: Path 1, the fluid in the inlet chamber seeps outward through the membrane wall of the tubular ceramic membrane module to the tubular membrane water outlet; Path 2, the fluid in the inlet chamber seeps into the interior of the hollow fiber ceramic membrane bundle from the outer wall of the membrane fibers, flows out through the inner wall of the membrane fibers to the hollow fiber membrane water outlet; Backwashing stage.

[0027] Specific implementation method seven: Combining Figure 1-3 This embodiment describes the method of using the high-packing-density dual-separation-path ceramic composite membrane module system. Single-path separation includes the following steps: Step D1: Raw water enters the membrane housing 7 through inlet 1. The water inlet rate is adjusted so that the ratio of the effective water inlet volume in the membrane housing 7 to the water inlet rate is the set hydraulic residence time. Step D2: Start the first pressure pump 13 or the second pressure pump 16 to drive the corresponding water production power unit to produce water output; Step D3: Wastewater in the inlet chamber of membrane housing 7 completes membrane filtration separation: one path is that the wastewater passes through the membrane wall of the 5 tubular ceramic membrane module and enters the tubular membrane permeate outlet 2; or another path is that the wastewater passes through the membrane wall of the hollow fiber ceramic membrane bundle 6 and enters the hollow fiber membrane permeate outlet 4, driving the corresponding permeate power unit to produce water output. Step D4: The concentrate is discharged from the system through the 3 concentrate outlets.

[0028] Specific implementation method eight: Combination Figure 1-3 This embodiment describes the method of using the high packing density dual-separation path ceramic composite membrane module system. The dual-path synergistic separation includes the following steps: Step S1: Raw water enters the membrane housing 7 through the inlet 1. The water inlet rate is adjusted so that the ratio of the effective water inlet volume in the membrane housing 7 to the water inlet rate is the set hydraulic residence time. Step S2: Start the first pressure pump 13 and the second pressure pump 16 to drive the two water production power units to produce water output respectively; Step S3: The wastewater in the inlet chamber of membrane housing 7 undergoes membrane filtration separation through two paths: one path is for the wastewater to pass through the membrane wall of the 5-tube ceramic membrane module and enter the 2-tube membrane permeate outlet, and the other path is for the wastewater to pass through the membrane wall of the 6-hollow fiber ceramic membrane bundle and enter the 4-hollow fiber membrane permeate outlet, which respectively drive the two permeate power units to produce water output. Step S4: The concentrate is discharged from the system through the 3 concentrate outlets. At the same time, the operating status can be changed by adjusting the first pressure valve 14 and the second pressure valve 17 of the two water production power units, so as to realize the on-demand switching between independent operation of a single filtration path or coordinated operation of dual filtration paths.

[0029] Specific Implementation Method Nine: Combining Figure 1-3 This embodiment describes the method of using the high packing density dual separation path ceramic composite membrane module system. The backwashing stage includes the following steps: Step R1: Stop the raw water intake process through inlet 1, shut down the first pressure pump 13 and the second pressure pump 16, and cut off the water flow channel during the stable water production stage; Step R2: Connect the backwash water source to the tubular membrane product outlet 2 and the hollow fiber membrane product outlet 4, start the first pressure pump 13, drive the backwash water source to pass through the membrane wall of the tubular ceramic membrane module 5 in the reverse direction and enter the water inlet chamber to flush the pollutants attached to the outer wall of the tubular membrane; at the same time, start the second pressure pump 16, drive the backwash water source to pass through the membrane wall of the hollow fiber ceramic membrane bundle 6 in the reverse direction and enter the water inlet chamber to flush the pollutants attached to the outer wall of the fiber membrane bundle, and discharge the backwash wastewater through the concentrate outlet 3. Step R3: By adjusting the opening of the first pressure valve 14 and the second pressure valve 17, synchronous backwashing or individual backwashing of the two water production power units can be achieved; during individual backwashing, the first pressure pump 13 or the second pressure pump 16 can be started as needed to complete the flushing of the corresponding water production unit path. Step R4: After backwashing is completed, close the backwash pipeline valve, start the first pressure pump 13 and the second pressure pump 16 to purge for a short time to discharge the backwash wastewater remaining in the membrane housing; then restore the water intake process of inlet 1 and switch back to the stable water production stage operation.

[0030] Specific Implementation Method Ten: Combining Figure 1-3 This embodiment describes the usage of the high-density dual-separation-path ceramic composite membrane module system. The pressure ratio of the two permeate power units is adjustable within a range of 1:5 to 5:1. By adjusting the opening of the pressure valves in each path, path one can be opened alone, path two can be opened alone, or both paths can operate in tandem to meet different pollutant separation requirements. The tandem operation of the two paths improves the unit energy consumption treatment efficiency, while the independent operation of a single path avoids ineffective energy consumption. The backwashing process does not require complex chemical cleaning processes, reducing reagent consumption and maintenance workload, and lowering long-term operation and maintenance costs.

[0031] Example 1: Combination Figure 1-3 The illustrated high-density dual-separation-path ceramic composite membrane module system includes an inlet 1, a concentrate outlet 3, a membrane housing 7, and two permeate power units. The first permeate power unit includes a tubular ceramic membrane module 5, a tubular membrane permeate outlet 2, a first check valve 12, a first pressure pump 13, and a first pressure valve 14 connected in series. The second permeate power unit includes a hollow fiber ceramic membrane bundle 6, a hollow fiber membrane permeate outlet 4, a second check valve 15, a second pressure pump 16, and a second pressure valve 17 connected in series.

[0032] The membrane housing 7 is made of 304 stainless steel, with a length of 1.5 m and an inner diameter of 250 mm. Its effective volume (excluding the proportion of the membrane module) is 0.06 m³, ensuring structural stability under high-pressure conditions while providing ample space for the rational arrangement of the dual membrane modules. The tubular ceramic membrane module 5 is made of alumina, with a membrane flux diameter of 8 mm, a membrane pore size of 800 nm, 19 channels, and a single length of 1.3 m. Its high mechanical strength provides protection for the internal modules. The hollow fiber ceramic membrane bundle 6 is also made of alumina, with an inner diameter of 1.2 mm, an outer diameter of 1.5 mm, a membrane pore size of 800 nm, and a single length of 1.35 m. 133 bundles are centrally arranged within the internal area enclosed by the tubular membrane module, with 7 bundles placed in each channel to maximize the use of internal space and increase the packing density to 130%-140%. In the sealing and potting assembly, the external flange 10 is fitted with a fluororubber O-ring 11, and the internal resin 8 is a composite material of epoxy resin and polyurethane. The potting layer is 30 mm thick and is fitted with a silicone-resistant sealing gasket 9, balancing both fixing strength and sealing effect. In the water production power and pressure control assembly, the first pressure pump 13 and the second pressure pump 16 meet the control range of pressure ratio of 1:5 to 5:1 and the pressure error requirement of ±0.05 MPa. The check valves (12, 15) are made of stainless steel and can effectively prevent fluid backflow.

[0033] During implementation, the first step S1 is to open the inlet valve 1, and the raw water enters the membrane housing 7 through the delivery pump. The water inlet rate is adjusted so that the ratio of the effective water inlet volume to the water inlet rate in the membrane housing is the set hydraulic residence time. This duration ensures that the raw water and the dual membrane components are in full contact to achieve efficient separation, while also avoiding water stagnation for too long, which would lead to the deposition of pollutants.

[0034] Next, proceed to step S2: Start the first pressure pump 13 and the second pressure pump 16, adjust the water production side pressure through the first pressure valve 14 and the second pressure valve 17, set the pressure ratio, monitor the pressure error in real time to ≤ ±0.05MPa, adapt to the structural differences of the two membrane modules, and ensure synchronous and efficient water production through dual paths.

[0035] Then proceed to step S3: the raw water in the inlet chamber is separated through two paths. Path one is that the raw water seeps out through the membrane wall of the tubular ceramic membrane module 5 to the tubular membrane product outlet 2, where the tubular membrane traps large-diameter suspended solids and some colloids. Path two is that the raw water seeps into the inner wall from the outer wall of the hollow fiber ceramic membrane bundle 6 and is discharged through the hollow fiber membrane product outlet 4.

[0036] Finally, step S4 is executed: the concentrate is discharged through concentrate outlet 3. At the same time, the operating mode can be flexibly switched according to the raw water quality. When the solid content is high, the second pressure valve 17 and the second pressure pump 16 are closed, and the operation is switched to single-path operation of the tubular membrane, which can withstand the impact of high solids liquid by utilizing its high mechanical strength. When the raw water is low-pollution and has a large treatment capacity, the pressure ratio is adjusted and the dual-path operation is coordinated to increase the total water flow rate and adapt to the large treatment capacity demand.

[0037] The backwashing process is initiated when the membrane flux drops to 60% of its initial value.

[0038] First, perform step R1: close the inlet valve 1 to stop the raw water supply; close the first pressure pump 13 and the second pressure pump 16 to cut off the water production channel and ensure that the backwashing effect is not disturbed.

[0039] Next, proceed to step R2: Connect the backwash water source to the tubular membrane product outlet 2 and the hollow fiber membrane product outlet 4, start the first pressure pump 13 and the second pressure pump 16, and the backwash water passes through the membrane wall in the reverse direction to flush the pollutants attached to the membrane surface, ensuring that the pollutants are effectively removed along the entire length of the membrane fibers, and the wastewater is discharged through the concentrate outlet 3.

[0040] Then, step R3 is executed: by adjusting the opening of the first pressure valve 14 and the second pressure valve 17, synchronous flushing or separate flushing can be achieved, which is suitable for scenarios with similar levels of contamination in both paths; separate flushing is suitable for cases with severe contamination in a single path, which can specifically remove pollutants and save backwash water and energy consumption.

[0041] Finally, perform step R4: close the backwash water source valve, start the first pressure pump 13 and the second pressure pump 16 to discharge the residual backwash wastewater in the membrane housing, so as to avoid the residual wastewater from affecting the quality of the subsequent produced water; then restore the water intake at inlet 1 and switch back to the produced water stage.

[0042] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, the present invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0043] The descriptions of "front," "rear," "left," "right," "inner," "outer," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ceramic composite membrane module system with high packing density and dual separation paths, characterized in that: include: The membrane shell (7) is provided with an inlet (1) and a second product water outlet (4) on the upper and lower sides respectively. The membrane shell (7) is provided with the upper filler (8), the upper sealing gasket (9), the lower sealing gasket (9), and the lower filler (8) in sequence from top to bottom. A first water outlet (2) is provided on the side wall of the membrane shell (7) between the two sealing gaskets (9), and a concentrate outlet (3) is provided on the side wall of the membrane shell (7) between the lower sealing gasket (9) and the lower filler (8). The upper and lower ends of the tubular ceramic membrane module (5) are connected to the sealing gasket (9) on the lower side; The upper end of the hollow fiber ceramic membrane bundle (6) is connected to the upper filler (8), and the lower end of the hollow fiber ceramic membrane bundle (6) passes through the tubular ceramic membrane assembly (5) and is connected to the lower filler (8).

2. The high-density dual-separation-path ceramic composite membrane module system according to claim 1, characterized in that: Also includes: A first check valve (12) is provided on the pipeline connecting one end of the first pressure pump (13) to the first water outlet (2), and a first pressure valve (14) is provided on the other end of the first pressure pump (13). A second check valve (15) is installed on the pipeline connecting one end of the second pressure pump (16) to the second water outlet (4), and a second pressure valve (17) is installed on the other end of the second pressure pump (16).

3. The high-density dual-separation-path ceramic composite membrane module system according to claim 1 or 2, characterized in that: Also includes: The membrane housing (7) is provided with separate upper and lower end caps. The connection between the membrane housing (7) and the end caps is filled with filler (8). An O-ring (11) is provided between the membrane housing (7) and the end caps. The membrane housing (7) and the end caps are connected by a flange (10).

4. The high packing density dual separation path ceramic composite membrane module system according to any one of claims 1-3, characterized in that: Several tubular ceramic membrane modules (5) are evenly arranged, and hollow fiber ceramic membrane bundles (6) are correspondingly arranged in each tubular ceramic membrane module (5).

5. The high-density dual-separation-path ceramic composite membrane module system according to claim 4, characterized in that: The membrane flux diameter of the tubular ceramic membrane module (5) is 2-10 mm, the membrane pore size is 1-5000 nm, and the membrane material is one or more of alumina, titanium oxide, zirconium oxide and silicon carbide. The hollow fiber ceramic membrane bundle (6) has an inner diameter of 0.5-2 mm and a membrane pore size of 1-1000 nm. The membrane material is one or more of alumina, titanium oxide, zirconium oxide and silicon carbide. The potting layer is made of one or more of epoxy resin, polyurethane, and silicone rubber, and the thickness of the potting layer is 20-40 mm.

6. A method for using a high-density, dual-separation-path ceramic composite membrane module system, characterized in that: The high-packing-density dual-separation-path ceramic composite membrane module system according to any one of claims 1-5 comprises: The membrane filtration water production stage includes single-path separation and dual-path synergistic separation; Backwashing stage.

7. The method of using the high packing density dual separation path ceramic composite membrane module system according to claim 6, characterized in that: Single-path separation includes the following steps: Step D1: Raw water enters the membrane shell (7) through the inlet (1), and the water inlet rate is adjusted so that the ratio of the effective water inlet volume in the membrane shell (7) to the water inlet rate is the set hydraulic residence time; Step D2: Start the first pressure pump (13) or the second pressure pump (16) to drive the corresponding water production power unit to produce water output; Step D3: Wastewater in the membrane housing (7) completes membrane filtration separation: one path is that the wastewater passes through the membrane wall of the tubular ceramic membrane module (5) and enters the tubular membrane permeate outlet (2); or another path is that the wastewater passes through the membrane wall of the hollow fiber ceramic membrane bundle (6) and enters the hollow fiber membrane permeate outlet (4), driving the corresponding permeate power unit to produce water output. Step D4: The concentrate is discharged from the system through the concentrate outlet (3).

8. The method of using the high packing density dual separation path ceramic composite membrane module system according to claim 6, characterized in that: Dual-path collaborative separation includes the following steps: Step S1: Raw water enters the membrane shell (7) through the inlet (1), and the water inlet rate is adjusted so that the ratio of the effective water inlet volume in the membrane shell (7) to the water inlet rate is the set hydraulic residence time; Step S2: Start the first pressure pump (13) and the second pressure pump (16) to drive the two water production power units to produce water output respectively; Step S3: The wastewater in the membrane shell (7) is simultaneously separated by membrane filtration through two paths: one path is for the wastewater to pass through the membrane wall of the tubular ceramic membrane module (5) and enter the tubular membrane water outlet (2); the other path is for the wastewater to pass through the membrane wall of the hollow fiber ceramic membrane bundle (6) and enter the hollow fiber membrane water outlet (4), which respectively drive the two water production power units to produce water output. Step S4: The concentrate is discharged from the system through the concentrate outlet (3).

9. The method of using the high packing density dual separation path ceramic composite membrane module system according to claim 6, characterized in that: The backwashing phase includes the following steps: Step R1: Stop the water intake process of raw water through the inlet (1), shut down the first pressure pump (13) and the second pressure pump (16), and cut off the water flow channel in the stable water production stage; Step R2: Connect the backwash water source to the tubular membrane product outlet (2) and the hollow fiber membrane product outlet (4), start the first pressure pump (13), drive the backwash water source to pass through the membrane wall of the tubular ceramic membrane module (5) in the reverse direction and enter the water inlet chamber to rinse the pollutants attached to the outer wall of the tubular membrane; at the same time, start the second pressure pump (16), drive the backwash water source to pass through the membrane wall of the hollow fiber ceramic membrane bundle (6) in the reverse direction and enter the water inlet chamber to rinse the pollutants attached to the outer wall of the fiber membrane bundle, and discharge the backwash wastewater through the concentrate outlet (3) into the system; Step R3: By adjusting the opening of the first pressure valve (14) and the second pressure valve (17), the synchronous backwashing or individual backwashing of the two water production power units can be achieved; during individual backwashing, the first pressure pump (13) or the second pressure pump (16) can be started as needed to complete the flushing of the corresponding water production unit path. Step R4: After backwashing is completed, close the backwash pipeline valve, start the first pressure pump (13) and the second pressure pump (16) to purge for a short time and discharge the backwash wastewater remaining in the membrane housing; then restore the water inlet (1) water flow and switch back to the stable water production stage operation.

10. The method of using the high packing density dual separation path ceramic composite membrane module system according to claims 7-9, characterized in that: The pressure ratio of the two water production power units can be adjusted from 1:5 to 5:

1. By adjusting the opening of the pressure valves of each path, path one can be opened alone, path two can be opened alone, or the two paths can be operated in coordination to meet the needs of different pollutant separation.

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