Membrane shell ceramic flat sheet membrane operating system

Abstract

The utility model belongs to water treatment technical field, concretely relates to a membrane -shell type ceramic flat sheet membrane operation system, including ceramic membrane subassembly, is provided with water inlet, water production outlet, back flush mouth and blowdown mouth on ceramic membrane subassembly, is connected with gas water mixed pipeline on water inlet, one end of gas water mixed pipeline far away from water inlet divides into compressed air pipeline and water inlet pipeline, is connected with air compressor on one end of compressed air pipeline far away from gas water mixed pipeline, is connected with oxygen tank on one end of water inlet pipeline far away from gas water mixed pipeline, is connected with water outlet pipeline on water production outlet, is provided with clean water buffer tank on water outlet pipeline, is connected with back flush pipeline on back flush mouth, back flush pipeline far away from back flush mouth one end with clean water buffer tank intercommunication, is connected with anaerobic tank on blowdown mouth. The device can realize parallel operation of water production and flushing, improve overall water production efficiency, the cleaning effect is more thorough, and the operation is reliable and the cost is lower.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically relating to a membrane shell type ceramic flat sheet membrane operating system. Background Technology

[0002] Ceramic flat sheet membranes are widely used in wastewater treatment and reuse due to their superior properties such as high mechanical strength, good chemical stability, long service life, and strong resistance to fouling. However, in practical engineering applications, traditional flat sheet membrane systems still face some technical challenges. Existing flat sheet membrane systems mostly employ intermittent operation combined with hydraulic backwashing for fouling control. However, the flushing force of hydraulic backwashing alone is limited, and the cleaning effect is not ideal for firmly attached fouling layers, especially gel layers formed by colloidal substances and bacterial flocs. Furthermore, to achieve better cleaning results, the backwashing process of traditional flat sheet membrane systems is often completely separated from the permeate flow. Backwashing requires stopping the influent pump, leading to discontinuous operation and complex procedures. In the event of unexpected power outages or other sudden failures, the flat sheet membrane system lacks an effective automatic emergency protection mechanism. Membrane modules remain in the wastewater, easily causing sludge deposition and caking, making it difficult to restore operation and potentially leading to the failure of the membrane modules.

[0003] Chinese patent CN203591697U discloses an ultrafiltration membrane module with an air-water backwashing device. The module includes a vertically arranged ultrafiltration membrane module. An input node and a first inlet water pipe are sequentially connected to the lower end of the module. The input node is also connected to a first drain pipe. An air inlet pipe is connected in parallel to the first inlet water pipe, and a compressed air output device is connected to the air inlet pipe. An outlet water pipe is located at the upper end of the ultrafiltration membrane module, and a second inlet water pipe is connected in parallel to the outlet water pipe. This patent adds a compressed air output device to the first inlet water pipe of a traditional ultrafiltration membrane module, utilizing the mixed impact of air and water to flush the ultrafiltration membrane module, resulting in better cleaning, more thorough decontamination, and greater water conservation. However, when switching to the flushing mode, the normal water production process must be interrupted. This means the system needs to frequently stop producing purified water for maintenance, reducing overall water production efficiency. Furthermore, this patent relies on multiple electric valves to frequently switch between different pipes, resulting in a complex piping system with low reliability and high cost. Utility Model Content

[0004] The purpose of this invention is to provide a membrane shell type ceramic flat sheet membrane operating system that can realize parallel operation of water production and rinsing, improve the overall water production efficiency, achieve a more thorough cleaning effect, and is reliable in operation and lower in cost.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A membrane shell type ceramic flat sheet membrane operation system includes a ceramic membrane module, which is provided with an inlet, a product water outlet, a backwash outlet, and a drain outlet. The inlet is connected to an air-water mixing pipeline, and the end of the air-water mixing pipeline away from the inlet splits into a compressed air pipeline and a water inlet pipeline. The end of the compressed air pipeline away from the air-water mixing pipeline is connected to an air compressor. The end of the water inlet pipeline away from the air-water mixing pipeline is connected to an aerobic tank. The product water outlet is connected to an outlet pipeline, and a purified water buffer tank is installed on the outlet pipeline. The backwash outlet is connected to a backwash pipeline, and the end of the backwash pipeline away from the backwash outlet is connected to the purified water buffer tank. The drain outlet is connected to an anaerobic tank.

[0006] Furthermore, a sludge feed pump is installed on the inlet pipeline, and a check valve is installed between the sludge feed pump and the air-water mixing pipeline.

[0007] Furthermore, a solenoid valve is installed on the compressed air pipeline; the solenoid valve is a normally open type.

[0008] Furthermore, a self-priming pump for producing water is installed between the purified water buffer tank and the water outlet.

[0009] Furthermore, a backwash pump is installed on the backwash line.

[0010] Furthermore, the ceramic membrane module is arranged in a cylindrical structure, and several flat ceramic membranes are arranged inside the ceramic membrane module.

[0011] Furthermore, several flat ceramic membranes are arranged in parallel along the radial direction of the ceramic membrane assembly.

[0012] Furthermore, the inlet, backwash outlet, and drain outlet are all arranged radially along the ceramic membrane module.

[0013] Furthermore, the opening direction of the inlet and the backwash port are both parallel to the arrangement direction of the several flat ceramic membranes.

[0014] Furthermore, the water outlet is located at the bottom of the ceramic membrane module, with the opening of the water outlet facing downwards.

[0015] The beneficial effects of this utility model are as follows: This invention combines compressed air and water inlet pipes into a single air-water mixing pipe, creating a vigorous two-phase flow during feeding. This efficiently washes the surface of the flat ceramic membrane, achieving simultaneous cleaning and filtration while feeding and producing water. This effectively prevents interruptions in water production due to the cleaning process, thus improving overall water production efficiency. Furthermore, this invention fundamentally prevents sludge deposition and caking, significantly reducing the risk of clogging and failure of the ceramic membrane module. The cleaning effect is more thorough, the operation is reliable, and the cost is lower. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the ceramic membrane module, water inlet, water outlet, backwash port, and drain port in this utility model; Figure 3 This is a partial structural cross-sectional view of the ceramic membrane module, water inlet, water outlet, backwash outlet, drain outlet, and flat ceramic membrane in this utility model. In the picture: 1. Ceramic membrane module; 2. Inlet; 3. Product water outlet; 4. Backwash outlet; 5. Sewage outlet; 6. Air-water mixing pipeline; 7. Compressed air pipeline; 8. Inlet water pipeline; 9. Air compressor; 10. Aerobic tank; 11. Outlet water pipeline; 12. Purified water buffer tank; 13. Backwash pipeline; 14. Anaerobic tank; 15. Feed sludge pump; 16. Check valve; 17. Solenoid valve; 18. Product water self-priming pump; 19. Backwash pump; 20. Flat sheet ceramic membrane. Detailed Implementation

[0017] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0018] Example 1 like Figure 1-3 As shown, the membrane shell type ceramic flat sheet membrane operation system includes a ceramic membrane module 1. The ceramic membrane module 1 is provided with an inlet 2, a product water outlet 3, a backwash outlet 4, and a drain outlet 5. An air-water mixing pipeline 6 is connected to the inlet 2. The end of the air-water mixing pipeline 6 away from the inlet 2 is divided into a compressed air pipeline 7 and a water inlet pipeline 8. An air compressor 9 is connected to the end of the compressed air pipeline 7 away from the air-water mixing pipeline 6. An aerobic tank 10 is connected to the end of the water inlet pipeline 8 away from the air-water mixing pipeline 6. An outlet water pipeline 11 is connected to the product water outlet 3. A purified water buffer tank 12 is provided on the outlet water pipeline 11. A backwash pipeline 13 is connected to the backwash outlet 4. The end of the backwash pipeline 13 away from the backwash outlet 4 is connected to the purified water buffer tank 12. An anaerobic tank 14 is connected to the drain outlet 5.

[0019] By setting up an air-water mixing pipeline 6, the compressed air pipeline 7 and the water inlet pipeline 8 are combined, enabling the system to form a strong air-water two-phase flow during normal water intake. This provides continuous and efficient physical flushing of the interior of the ceramic membrane module 1, achieving parallel water production and cleaning without interrupting the water production process for cleaning. This improves the overall water production efficiency and automation of the system. The backwash pipeline 13 is connected to the purified water buffer tank 12, allowing the purified water produced by the ceramic membrane module 1 itself to be used directly to flush the ceramic membrane module 1. This achieves internal recycling of water resources and saves water costs.

[0020] A sludge feed pump 15 is installed on the water inlet pipeline 8, and a check valve 16 is installed between the sludge feed pump 15 and the air-water mixing pipeline 6.

[0021] The feed sludge pump 15 provides stable power for the transport of the liquid to be filtered from the aerobic tank 10 to the ceramic membrane module 1, ensuring the continuous operation of the filtration process; the check valve 16 can prevent the gas-water mixture in the gas-water mixing pipeline 6 from flowing back to the feed sludge pump 15.

[0022] A solenoid valve 17 is installed on the compressed air pipeline 7. The solenoid valve 17 is a normally open type. In the event of an unexpected power outage, the solenoid valve 17 automatically remains open, allowing compressed air from the air compressor 9 to enter the ceramic membrane module 1 through the compressed air pipeline 7 and the air-water mixing pipeline 6 to perform a purging task. This forces the residual liquid in the ceramic membrane module 1 to be discharged, fundamentally preventing sludge from depositing and caking in the ceramic membrane module 1 during shutdown, and reducing the risk of blockage and failure of the ceramic membrane module 1.

[0023] A self-priming pump 18 is installed between the purified water buffer tank 12 and the product water outlet 3. The self-priming pump 18 can form a stable suction force on one side of the ceramic membrane module 1, thereby improving the product water flux and efficiency of the ceramic membrane module 1 and ensuring the product water rate.

[0024] A backwash pump 19 is installed on the backwash line 13. The backwash pump 19 provides driving force for the backwash process, allowing clean water from the clean water buffer tank 12 to enter the ceramic membrane module 1 and flush away contaminants inside the ceramic membrane module 1.

[0025] The ceramic membrane module 1 has an overall cylindrical structure, and several flat ceramic membranes 20 are arranged inside the ceramic membrane module 1.

[0026] Several flat ceramic membranes 20 are arranged in parallel along the radial direction of the ceramic membrane assembly 1.

[0027] The inlet 2, backwash port 4, and drain port 5 are all arranged radially along the ceramic membrane module 1. This facilitates the rapid and uniform distribution of fluid among all the flat ceramic membranes 20 when it enters the ceramic membrane module 1, thereby improving the cleaning effect.

[0028] The opening direction of the inlet 2 and the opening direction of the backwash port 4 are both parallel to the arrangement direction of the several flat ceramic membranes 20. This allows the impact force of the fluid to act directly and efficiently on the surface of the flat ceramic membranes 20, resulting in a short rinsing path and good cleaning effect.

[0029] The product water inlet 3 is located at the bottom of the ceramic membrane module 1, with its opening facing downwards. This ensures that any residual liquid inside the ceramic membrane module 1 is completely discharged through the product water inlet 3 during shutdown, improving the system's reliability and lifespan.

[0030] Working process and principle: I. Water Production and Continuous Cleaning Start the feed sludge pump 15 to pump the liquid to be treated from the aerobic tank 10 through the inlet pipe 8; start the air compressor 9 and the compressed air flows out through the compressed air pipe 7; the liquid to be treated and the compressed air merge in the gas-water mixing pipe 6 to form a violent gas-water two-phase flow. The gas-water two-phase flow enters the ceramic membrane module 1 through the inlet 2. After entering the ceramic membrane module 1, the gas-water two-phase flow generates violent shearing, oscillation and scrubbing effects to prevent the ceramic membrane module 1 from becoming clogged.

[0031] Under the suction action of the self-priming pump 18, the purified water passes through the flat ceramic membrane 20 and enters the water flow channel inside the flat ceramic membrane 20. After being collected, it is discharged from the water outlet 3 and enters the purified water buffer tank 12 through the water outlet pipe 11 for storage and later use. The concentrated liquid and the pollutants flushed down enter the anaerobic tank 14 through the sewage outlet 5.

[0032] II. Backwashing Start the backwash pump 19 to draw the purified water produced by the ceramic membrane module 1 itself from the purified water buffer tank 12, and transport it into the ceramic membrane module 1 through the backwash pipeline 13. Under the pressure drive of the backwash pump 19, the purified water flushes the pollutants attached to the surface of the flat ceramic membrane 20 into the interior of the ceramic membrane module 1; the high-concentration wastewater flushed off is discharged into the anaerobic tank 14 through the drain outlet 5.

[0033] III. Emergency Protection and Automatic Drainage When the system experiences an unexpected power outage, the sludge feed pump 15, the permeate self-priming pump 18, and the backwash pump 19 stop operating. At this time, the solenoid valve 17 automatically returns to the open state due to power loss. Although the air compressor 9 has stopped, pressurized compressed air remains in the air compressor 9 and the compressed air pipeline 7. This residual air flows into the ceramic membrane module 1 from the inlet 2 through the air-water mixing pipeline 6. The inflowing residual air forms an air sweep. At the same time, since the permeate outlet 3 is located at the bottom of the ceramic membrane module 1 and faces downward, the residual liquid inside the ceramic membrane module 1 will be completely forced out and emptied from the permeate outlet 3 under the combined action of air pressure and gravity. The check valve 16 can effectively prevent gas and liquid from flowing back into the inlet pipeline 8, fundamentally avoiding the deposition and caking of sludge in the ceramic membrane module 1 during shutdown, reducing the risk of blockage and scrapping of the ceramic membrane module 1.

Claims

1. A membrane shell type ceramic flat sheet membrane operation system, comprising a ceramic membrane module (1), characterized in that, The ceramic membrane module (1) is provided with an inlet (2), a product water outlet (3), a backwash outlet (4) and a drain outlet (5). The inlet (2) is connected to an air-water mixing pipeline (6). The end of the air-water mixing pipeline (6) away from the inlet (2) is divided into a compressed air pipeline (7) and an inlet water pipeline (8). The end of the compressed air pipeline (7) away from the air-water mixing pipeline (6) is connected to an air compressor (9). The end of the inlet water pipeline (8) away from the air-water mixing pipeline (6) is connected to an aerobic tank (10). The product water outlet (3) is connected to an outlet water pipeline (11). A purified water buffer tank (12) is provided on the outlet water pipeline (11). The backwash outlet (4) is connected to a backwash pipeline (13). The end of the backwash pipeline (13) away from the backwash outlet (4) is connected to the purified water buffer tank (12). The drain outlet (5) is connected to an anaerobic tank (14).

2. The membrane shell type ceramic flat plate membrane operation system according to claim 1, characterized in that, A sludge feed pump (15) is installed on the water inlet pipeline (8), and a check valve (16) is installed between the sludge feed pump (15) and the air-water mixing pipeline (6).

3. The membrane shell type ceramic flat sheet membrane operation system according to claim 1, characterized in that, A solenoid valve (17) is installed on the compressed air pipeline (7). The solenoid valve (17) is a normally open solenoid valve.

4. The membrane shell type ceramic flat sheet membrane operation system according to claim 1, characterized in that, A self-priming pump (18) is installed between the water purification buffer tank (12) and the water production port (3).

5. The membrane shell type ceramic flat sheet membrane operation system according to claim 1, characterized in that, A backwash pump (19) is installed on the backwash line (13).

6. The membrane shell type ceramic flat sheet membrane operation system according to claim 1, characterized in that, The ceramic membrane module (1) is arranged in a cylindrical structure, and several flat ceramic membranes (20) are arranged inside the ceramic membrane module (1).

7. The membrane shell type ceramic flat plate membrane operation system according to claim 6, characterized in that, Several flat ceramic membranes (20) are arranged in parallel along the radial direction of the ceramic membrane assembly (1).

8. The membrane shell type ceramic flat sheet membrane operation system according to claim 7, characterized in that, The inlet (2), backwash outlet (4) and drain outlet (5) are all arranged radially along the ceramic membrane module (1).

9. The membrane shell type ceramic flat sheet membrane operation system according to claim 8, characterized in that, The opening direction of the inlet (2) and the opening direction of the backwash port (4) are both parallel to the arrangement direction of several flat ceramic membranes (20).

10. The membrane shell type ceramic flat plate membrane operation system according to claim 6, characterized in that, The water outlet (3) is located at the bottom of the ceramic membrane module (1), and the opening direction of the water outlet (3) is downward.

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