Ceramic membrane flushing device and ceramic membrane flushing method

Abstract

The invention discloses a ceramic membrane flushing device, comprising a ceramic membrane, wherein the ceramic membrane comprises a ceramic membrane water inlet, a ceramic membrane water outlet and a ceramic membrane wastewater outlet, wherein the ceramic membrane water inlet is connected to raw water through a water inlet pump, the ceramic membrane water outlet is connected to a water production tank, the ceramic membrane water inlet is selectively connected to a hydrogen chloride storage tank and a sodium hydroxide storage tank, the ceramic membrane wastewater outlet can be selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank respectively, the compressed gas source is selectively connected to the ceramic membrane water inlet; the ceramic membrane water outlet is selectively connected to a backwashing device; the backwashing device comprises a backwashing pump, the inlet of the backwashing pump is connected to the water production tank, and the outlet of the backwashing pump is selectively connected to the ceramic membrane water outlet, the investment cost is low, the operation is simple, the ceramic membrane is thoroughly flushed, the water production of the ceramic membrane is guaranteed, and the service life of the ceramic membrane is extended at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment devices, and in particular relates to a ceramic membrane flushing device and a ceramic membrane flushing method. Background Art

[0002] As a new material for surface water treatment, ceramic membrane uses high-temperature sintered α-type aluminum oxide (corundum) substrate. At 1300 degrees Celsius, γ-type and β-type are all converted to α-type, and then secondary sintered with high-quality nano-level coating. The pressure resistance reaches 10bar. Due to sufficient strength, the water inlet flow channel is made into a 2.4mm diameter, and the pollution space is greatly increased. When the water inlet SS is high, the ceramic membrane can also carry out cross-flow with a larger flow rate, which can more effectively slow down the deposition of pollutants.

[0003] The ceramic membrane is a rigid filtration layer. When impurities in the water continue to accumulate on the surface of the membrane, the surface sediments accumulate more and more over time, increasing the filtration pressure of the membrane and reducing the water production of the membrane. Therefore, regular backwashing and chemical cleaning are required to clean up the surface dirt.

[0004] Under normal circumstances, the ceramic membrane needs to be backwashed every 40 minutes of operation. Backwashing can remove most of the throttling dirt and blockages, but as the use time increases, the pollutants that are difficult to clean accumulated in each backwashing are also increasing. Summary of the invention

[0005] The purpose of the present invention is to provide a ceramic membrane flushing device and a ceramic membrane flushing method, which is intended to solve the problem that the ceramic membrane is not flushed thoroughly during the flushing process, resulting in more and more deposits on the ceramic membrane, which causes the ceramic membrane to be blocked and the water production to be reduced.

[0006] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0007] A ceramic membrane flushing device, comprising a ceramic membrane, wherein the ceramic membrane comprises a ceramic membrane water inlet, a ceramic membrane water outlet and a ceramic membrane wastewater outlet, wherein the ceramic membrane water inlet is connected to raw water via a water inlet pump, and the ceramic membrane water outlet is connected to a production water tank, and wherein the ceramic membrane water inlet is selectively connected to a cleaning device, and the ceramic membrane water outlet is selectively connected to a backwashing device;

[0008] The cleaning device comprises a hydrogen chloride storage tank, a sodium hydroxide storage tank, a cleaning pump, and a pressure gas source. The outlet pipelines of the hydrogen chloride storage tank and the sodium hydroxide storage tank can be selectively connected to the cleaning pump inlet, respectively, and the cleaning pump outlet can be selectively connected to the water inlet of the ceramic membrane. The ceramic membrane wastewater outlet can be selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank, respectively, and the pressure gas source is selectively connected to the water inlet of the ceramic membrane.

[0009] The backwash device comprises a backwash pump, the inlet of the backwash pump is connected to the water production tank, and the outlet of the backwash pump is selectively connected to the water outlet of the ceramic membrane.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the water outlet of the ceramic membrane can be selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank.

[0011] On the basis of the above scheme and as a preferred scheme of the above scheme: a regulating valve is provided in the connecting pipeline between the pressure gas source and the water inlet of the ceramic membrane.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: the ceramic membrane is vertically arranged, and the water inlet and the water outlet of the ceramic membrane are respectively located at the lower end and the upper end of the ceramic membrane.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: the ceramic membrane water inlet, ceramic membrane water inlet and ceramic membrane wastewater outlet are selectively connected to the first shower valve, the second shower valve and the third shower valve through pipelines respectively.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the pressure gas source is connected to the water inlet of the ceramic membrane using an air filling pipe with an inner diameter of 4-6 mm.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: a ceramic membrane flushing method of a ceramic membrane flushing device, characterized in that: comprising the following steps

[0016] S1: After the ceramic membrane runs for 35-45 minutes, the outlet of the backwash pump is connected to the water outlet of the ceramic membrane for backwashing;

[0017] S2: After the ceramic membrane runs for a set time, the water inlet of the ceramic membrane is connected to the cleaning pump, the cleaning pump is selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank, the ceramic membrane wastewater outlet is selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank, and the cleaning pump is started;

[0018] S3: After the ceramic membrane cavity is filled with hydrogen chloride or sodium hydroxide, the cleaning pump is stopped for a delay, soaked, and the cleaning pump is started for circulation after the delay;

[0019] S4: Connect the water inlet of the ceramic membrane to the pressure gas source.

[0020] On the basis of the above scheme and as a preferred scheme of the above scheme: step S4 also includes the step of adjusting the regulating valve to control the intake pressure at 0.2-0.4Mpa.

[0021] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: compressed air is added into the water (cleaning liquid) under each ceramic membrane to fully mix the inside of the membrane, thereby increasing the disturbance of the cleaning liquid in the membrane and increasing the contact force between the membrane surface and the cleaning liquid. For the entire system, the investment cost is low, the operation is simple, the ceramic membrane is thoroughly flushed, the water production of the ceramic membrane is guaranteed, and the service life of the ceramic membrane is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the connection between the cleaning device and the water inlet of the ceramic membrane. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of this application clearer, the following will be combined with the appended examples in the embodiment. Figure 1-2 , clearly and completely describe the technical solutions in the embodiments.

[0025] A ceramic membrane flushing device comprises a first ceramic membrane 10 and a second ceramic membrane 20. The first ceramic membrane 10 and the second ceramic membrane 20 respectively comprise a first ceramic membrane water inlet 12, a first ceramic membrane water outlet 11, a first ceramic membrane wastewater outlet 13, a second ceramic membrane water inlet 22, a second ceramic membrane water outlet 21, and a second ceramic membrane wastewater outlet 23. The first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22 are both connected to a raw water tank 60 via a water inlet pump 90, the first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21 are connected to a production water tank 70, and the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22 are selectively connected to a cleaning device.

[0026] The cleaning device comprises a hydrogen chloride storage tank 50, a sodium hydroxide storage tank 40, a cleaning pump 90, and a pressure gas source 30. The pipelines of the hydrogen chloride storage tank 50 and the sodium hydroxide storage tank outlet 40 can be selectively connected to the cleaning pump inlet 92, respectively. The cleaning pump outlet 91 is selectively connected to the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22. The first ceramic membrane wastewater outlet 13 and the second ceramic membrane wastewater outlet 23 can be selectively connected to the hydrogen chloride storage tank 50 and the sodium hydroxide storage tank 40, respectively. The pressure gas source 30 is selectively connected to the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22.

[0027] Specifically, valves are respectively provided in the pipelines connecting the hydrogen chloride storage tank 50, the sodium hydroxide storage tank 40 and the cleaning pump inlet 92, and valves are respectively provided in the pipelines connecting the first ceramic membrane wastewater outlet 13, the second ceramic membrane wastewater outlet 23 and the hydrogen chloride storage tank 50, the sodium hydroxide storage tank 40; when hydrogen chloride is used for soaking and cleaning, the valve in the pipeline connecting the hydrogen chloride storage tank 50 and the cleaning pump inlet 92 is opened, and the corresponding valves in the pipeline connecting the first ceramic membrane wastewater outlet 13, the second ceramic membrane wastewater outlet 23 and the hydrogen chloride storage tank 50 are opened at the same time, so that a return line is formed. Similarly, when sodium hydroxide is used for soaking and cleaning, the valve in the pipeline connecting the sodium hydroxide storage tank 40 and the cleaning pump inlet 92 is opened, and at the same time, the corresponding valves in the pipeline connecting the first ceramic membrane wastewater outlet 13, the second ceramic membrane wastewater outlet 23 and the sodium hydroxide storage tank 40 are opened to form a loop; a valve is provided in the pipeline between the pressure gas source 30 and the first ceramic membrane water inlet 12, the second ceramic membrane water inlet 22, and the pressure gas source 30 will be connected to the first ceramic membrane water inlet 12, the second ceramic membrane water inlet 22 only when hydrogen chloride or sodium hydroxide is used for soaking and cleaning.

[0028] The first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21 are selectively connected to the backwash device; the backwash device includes a backwash pump 100, the inlet of the backwash pump 100 is connected to the water production tank 70, the outlet of the backwash pump 100 is selectively connected to the first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21, and the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22 are selectively connected to the first shower valve 110.

[0029] Specifically, a valve is provided in the connecting pipeline between the outlet of the backwash pump 100 and the first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21, and a valve is provided in the connecting boiler between the inlet of the backwash pump 100 and the water production tank 70. Only during the backwashing suction process will the valve in the backwashing pipeline be opened, the first shower valve 110 is opened, and clean water enters the first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21 through the backwash pump 100 for backwashing, and then flows out from the first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21, and is discharged into the drainage system through the first shower valve 110.

[0030] The connecting pipeline between the pressure gas source 30 and the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22 is provided with a regulating valve 32 .

[0031] The first ceramic membrane 10 and the second ceramic membrane 20 are vertically arranged, and the water inlet and the water outlet of the two are respectively located at the lower end and the upper end of the ceramic membrane.

[0032] The first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21 are selectively connected to the second shower valve 120 , and the first ceramic membrane wastewater outlet 13 and the second ceramic membrane wastewater outlet 23 are selectively connected to the third shower valve 110 .

[0033] The purpose of setting the second shower valve 120 here is that after the cleaning is completed, some waste liquid will remain in the ceramic membrane. In order to avoid the waste liquid from mixing into the treated clean water, after the cleaning is completed, the first part of the water mixed with the residual waste liquid produced by the ceramic membrane is discharged through the second shower valve 120, and then the second shower valve 120 is closed; the purpose of setting the third shower valve 130 is to discharge the waste liquid after cleaning to the drainage system through the second shower valve 120 after the cleaning is completed.

[0034] A ceramic membrane flushing method for a ceramic membrane flushing device comprises the following steps

[0035] S1: After the ceramic membrane runs for 35-45 minutes, the outlet of the backwash pump 100 is connected to the first ceramic membrane water outlet 11 and the second ceramic membrane water outlet 21 for backwashing;

[0036] S2: After the first ceramic membrane and the second ceramic membrane have been running for a set time, the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22 are connected to the cleaning pump 90, the cleaning pump 90 is selectively connected to the hydrogen chloride storage tank 50 and the sodium hydroxide storage tank 40, respectively, the first ceramic membrane wastewater outlet 13 and the second ceramic membrane wastewater outlet 23 are selectively connected to the hydrogen chloride storage tank 50 and the sodium hydroxide storage tank 40, respectively, and the cleaning pump 90 is started;

[0037] S3: The hydrogen chloride storage tank 50 and the sodium hydroxide storage tank 40 are respectively filled with hydrogen chloride solution and sodium hydroxide solution, and the hydrogen chloride solution or the sodium hydroxide solution is filled into the first ceramic membrane and the second ceramic membrane cavity;

[0038] S4: Connect the first ceramic membrane water inlet 12 and the second ceramic membrane water inlet 22 to the pressure gas source, delay the shutdown of the cleaning pump 90, soak and start the cleaning pump 90 for circulation after the delay, and after the cleaning is completed, open the third shower valve 130 to discharge the cleaning waste liquid.

[0039] Step S4 also includes the step of adjusting the regulating valve 32 to control the intake air pressure at 0.2-0.4 MPa.

[0040] It should be noted that the first shower valve, the second shower valve, the third shower valve, the cleaning pump, the backwash pump pressure air source and the valves in each pipeline in this embodiment can all be controlled by an automatic control system to achieve timed automatic cleaning without manual operation.

[0041] The air needs to be connected to the lower entrance of each membrane through an air adding pipe 31 with an inner diameter of 4-6mm, and cannot be connected to the main pipe to ensure that the compressed air enters to handle small bubbles.

[0042] It should be noted that if there is a compressed air source, it can be directly connected to the compressed air source. If there is no compressed air source, a compressed air blower can be added.

[0043] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ceramic membrane flushing device, comprising a ceramic membrane, wherein the ceramic membrane comprises a ceramic membrane water inlet, a ceramic membrane water outlet and a ceramic membrane wastewater outlet, wherein the ceramic membrane water inlet is connected to raw water through a water inlet pump, and the ceramic membrane water outlet is connected to a water production tank, characterized in that: The water inlet of the ceramic membrane is selectively connected to the cleaning device, and the water outlet of the ceramic membrane is selectively connected to the backwashing device; The cleaning device comprises a hydrogen chloride storage tank, a sodium hydroxide storage tank, a cleaning pump, and a pressure gas source. The outlet pipelines of the hydrogen chloride storage tank and the sodium hydroxide storage tank can be selectively connected to the cleaning pump inlet, respectively, and the cleaning pump outlet can be selectively connected to the water inlet of the ceramic membrane. The ceramic membrane wastewater outlet can be selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank, respectively, and the pressure gas source is selectively connected to the water inlet of the ceramic membrane. The backwash device comprises a backwash pump, the inlet of the backwash pump is connected to the water production tank, and the outlet of the backwash pump is selectively connected to the water outlet of the ceramic membrane; The water outlet of the ceramic membrane can be selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank; The connecting pipeline between the pressure gas source and the water inlet of the ceramic membrane is provided with a regulating valve; The ceramic membrane is vertically arranged, and the water inlet and outlet of the ceramic membrane are respectively located at the lower end and the upper end of the ceramic membrane; The ceramic membrane water inlet, the ceramic membrane water inlet, and the ceramic membrane wastewater outlet are selectively connected to the first shower valve, the second shower valve, and the third shower valve through pipelines respectively; The pressure gas source is connected to the water inlet of the ceramic membrane using a gas adding pipe with an inner diameter of 4-6 mm.

2. A ceramic membrane flushing method according to claim 1, characterized in that: The following steps are included S1: After the ceramic membrane runs for 35-45 minutes, the outlet of the backwash pump is connected to the water outlet of the ceramic membrane for backwashing; S2: After the ceramic membrane runs for a set time, the water inlet of the ceramic membrane is connected to the cleaning pump, the cleaning pump is selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank, the ceramic membrane wastewater outlet is selectively connected to the hydrogen chloride storage tank and the sodium hydroxide storage tank, and the cleaning pump is started; S3: Filling the ceramic membrane cavity with hydrogen chloride solution or sodium hydroxide solution; S4: Connect the water inlet of the ceramic membrane to the pressure gas source, delay the shutdown of the cleaning pump, soak and start the cleaning pump for circulation after the delay.

3. The ceramic membrane flushing method according to claim 2, characterized in that : Step S4 also includes the step of adjusting the regulating valve to control the intake pressure at 0.2-0.4Mpa.

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