Anti-pollution ceramic membrane and preparation method and application thereof

Abstract

The application relates to the technical field of inorganic material manufacturing, and particularly discloses an anti-pollution ceramic membrane and a preparation method and application thereof, which comprises the following components: white corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, machine oil and water. The lepidolite powder, the potassium feldspar powder, the zirconium dioxide powder and the titanium dioxide powder are added to the white corundum powder, and then the kaolin powder, the cellulose powder, the starch, the vegetable oil, the machine oil and the water are added, so that the prepared ceramic membrane has the advantages of high water flux, strong anti-pollution capacity and high bending strength.

Description

Technical Field

[0001] This invention relates to the field of inorganic material manufacturing technology, specifically to an anti-fouling ceramic membrane, its preparation method, and its application. Background Technology

[0002] Membrane filtration technology, as the "third-generation water purification process," is one of the most promising technologies of this century. The performance of membrane materials is a crucial factor affecting the efficiency of membrane processes. Traditional membrane materials are mostly hydrophobic organic polymers, making them highly susceptible to fouling by microorganisms, biomolecules, and oil, leading to a rapid decline in their separation efficiency and permeability. In practical use, traditional organic membrane materials often experience chemical degradation, aging, and swelling due to frequent cleaning, significantly reducing their lifespan and severely hindering the further promotion of membrane technology. Therefore, developing membrane materials with good chemical stability, strong mechanical properties, long service life, and anti-fouling properties is a key research direction for promoting the development of membrane filtration technology.

[0003] In recent years, the application of inorganic ceramic membranes in wastewater treatment has received increasing attention. Compared with organic membranes, ceramic membranes have advantages such as simple operation and maintenance, stronger corrosion resistance, longer service life, wider applicability, and better effluent quality. However, high-performance ceramic membrane materials are currently expensive and still suffer from significant membrane fouling, making them unsuitable for large-scale municipal water treatment, especially in the field of domestic wastewater treatment.

[0004] Therefore, it is necessary to design a ceramic membrane that can be applied to large-scale municipal water treatment. Summary of the Invention

[0005] The purpose of this invention is to provide an antifouling ceramic membrane, its preparation method, and its application. This ceramic membrane has the advantages of high water flux, strong antifouling ability, and high flexural strength.

[0006] This invention is achieved through the following technical solution:

[0007] An antifouling ceramic membrane, comprising the following components:

[0008] White corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, engine oil, and water.

[0009] The white corundum powder in the antifouling ceramic membrane of the present invention is the basic raw material, and the kaolin powder has plasticity and is a commonly used component in the forming process of ceramic body. By adding a certain proportion of zirconium dioxide powder and titanium dioxide powder to the basic raw material, the water flux, antifouling ability and flexural strength of the antifouling ceramic membrane can be improved. Among them, the effect of improving the antifouling ability is particularly prominent. By adding a certain proportion of lepidolite powder and potassium feldspar powder to the basic raw material, the mechanical strength of the antifouling ceramic membrane can be significantly improved.

[0010] In summary, by adding lepidolite powder, potassium feldspar powder, zirconium dioxide powder, and titanium dioxide powder to white fused alumina powder, and further supplementing it with kaolin powder, cellulose powder, starch, vegetable oil, machine oil, and water, the present invention enables the preparation of ceramic membranes with advantages such as high water flux, strong anti-fouling ability, and high flexural strength.

[0011] This application optimized the proportions of white corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, engine oil, and water in the formula through experiments. The optimized formula achieves a better balance between water flux, antifouling ability, and flexural strength of the antifouling ceramic membrane, enabling the prepared ceramic membrane to have the advantages of high water flux, strong antifouling ability, and high flexural strength.

[0012] In one alternative, the following components by weight are included:

[0013] 100 parts white corundum powder, 1-10 parts lepidolite powder, 5-15 parts kaolin powder, 1-15 parts cellulose powder, 5-20 parts starch, 1-10 parts potassium feldspar powder, 1-10 parts zirconium dioxide powder, 1-10 parts titanium dioxide powder, 1-15 parts vegetable oil, 1-10 parts machine oil, and 10-50 parts water.

[0014] In one alternative, the following components by weight are included:

[0015] 100 parts white corundum powder, 1-3 parts lepidolite powder, 3-10 parts kaolin powder, 5-10 parts cellulose powder, 5-10 parts starch, 1-3 parts potassium feldspar powder, 1-2 parts zirconium dioxide powder, 1-2 parts titanium dioxide powder, 1-10 parts vegetable oil, 1-2 parts engine oil, and 20-30 parts water.

[0016] A method for preparing an antifouling ceramic membrane includes the following steps:

[0017] S1. Mixing of powders: Take white corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, machine oil and water, mix them and stir until a wet embryo in the form of lumps is formed.

[0018] S2. First aging of wet embryos: The wet embryos obtained in step S1 are placed in a constant temperature and humidity environment for a first aging.

[0019] S3. Refining of wet embryos: The wet embryos processed in step S2 are refined in a vacuum environment.

[0020] S4. Secondary aging of wet embryos: The wet embryos treated in step S3 are placed in a constant temperature and humidity environment for secondary aging.

[0021] S5. Extrusion molding of wet preform: The wet preform processed in step S4 is extruded into shape;

[0022] S6. Drying to obtain dry blanks;

[0023] S7. The dry blank is calcined at high temperature to obtain a ceramic film.

[0024] Furthermore, in step S2, the aging time is 12h~48h, the temperature is 20~30℃, and the humidity is 70%~90%.

[0025] Furthermore, in step S4, the secondary aging time is 12h~48h, the temperature is 20~30℃, and the humidity is 70%~90%.

[0026] Furthermore, in step S6, the drying method is room temperature ventilation drying, and the time is 24 h to 120 h.

[0027] Furthermore, in step S7, the high-temperature calcination temperature is 30~1500℃, the heating rate is 1~5℃ / min, and the calcination time is 2~5 days.

[0028] An application of an antifouling ceramic membrane in water treatment, including municipal wastewater treatment.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] 1. The ceramic membrane prepared by this invention has the advantages of high water flux, strong antifouling ability, and high flexural strength. Taking the prepared flat plate ceramic membrane as an example, the pure water flux of a single-layer flat plate ceramic membrane can exceed 5000. It is 3 to 5 times stronger than double-layer alumina ceramic membranes; when the prepared ceramic membrane is used in MBR, it has strong anti-fouling ability and the transmembrane pressure difference growth rate can reach 3.5 kPa / day, which is only half that of similar products; the prepared ceramic membrane has a flexural mechanical strength of over 30 MPa, and can reach up to 52.12 MPa, which is 1.5 to 2 times that of similar products, and has a longer service life.

[0031] 2. By optimizing the formulation of the ceramic membrane, this invention can shorten the process of preparing the ceramic membrane and significantly reduce production costs. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram comparing the pure water flux of the antifouling ceramic membrane prepared in Example 2 of the present invention and the alumina ceramic membrane prepared in Comparative Example 1.

[0034] Figure 2 This is a schematic diagram of the experimental apparatus used in the anti-pollution performance test of the present invention;

[0035] Figure 3 This is a schematic diagram of the antifouling test results of the present invention, wherein (a) is the antifouling test result with a running flux of 20 LMH; (b) is the antifouling test result with a running flux of 25 LMH; and (c) is the antifouling test result with a running flux of 30 LMH; A8 is an alumina ceramic membrane and C5 is an antifouling ceramic membrane.

[0036] Figure 4 This is a schematic diagram comparing the flexural strength of the antifouling ceramic membrane prepared in Example 2 of the present invention and the alumina ceramic membrane prepared in Comparative Example 1; A8 is the alumina ceramic membrane and C5 is the antifouling ceramic membrane.

[0037] The attached diagram shows the markings and corresponding component names:

[0038] 1-High-level water tank; 2-Reactor; 3-Float valve; 4-Membrane module; 5-Vacuum pressure gauge; 6-Peristaltic pump. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. The embodiments described below are some, but not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] In the following description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, materials, or methods are not specifically described to avoid obscuring the invention. Unless otherwise specified, the materials, instruments, and reagents used in the following embodiments are commercially available. Unless otherwise specified, the techniques used in the embodiments are conventional methods well known to those skilled in the art.

[0041] To improve the properties of ceramic membranes that combine high water flux, strong antifouling ability, and high flexural strength for large-scale municipal water treatment, this embodiment provides an antifouling ceramic membrane, comprising the following components:

[0042] White corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, engine oil, and water.

[0043] Optionally, it includes the following components in parts by weight:

[0044] 100 parts white corundum powder, 1-10 parts lepidolite powder, 5-15 parts kaolin powder, 1-15 parts cellulose powder, 5-20 parts starch, 1-10 parts potassium feldspar powder, 1-10 parts zirconium dioxide powder, 1-10 parts titanium dioxide powder, 1-15 parts vegetable oil, 1-10 parts machine oil, and 10-50 parts water.

[0045] Optionally, it includes the following components in parts by weight:

[0046] 100 parts white corundum powder, 1-3 parts lepidolite powder, 3-10 parts kaolin powder, 5-10 parts cellulose powder, 5-10 parts starch, 1-3 parts potassium feldspar powder, 1-2 parts zirconium dioxide powder, 1-2 parts titanium dioxide powder, 1-10 parts vegetable oil, 1-2 parts engine oil, and 20-30 parts water.

[0047] The preparation method of the above-mentioned antifouling ceramic membrane includes the following steps:

[0048] S1. Mixing of powders: Take white corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, machine oil and water and put them into the DX-500B high-speed mixer in a certain proportion, stir for 10 min to 120 min, and stir until a wet embryo in the shape of lumps is formed.

[0049] S2. First aging of wet embryos: The wet embryos obtained in step S1 are placed in a constant temperature and humidity environment for a first aging; the aging time is 12h~48h, the temperature is 20~30℃, and the humidity is 70%~90%;

[0050] S3. Refining of wet slurry: The wet slurry processed in step S2 is fed into a vacuum plow mill for refining. The extrusion pressure is 15 MPa and the system vacuum degree is -0.095 MPa.

[0051] S4. Secondary aging of wet embryos: The wet embryos treated in step S3 are placed in a constant temperature and humidity environment for secondary aging; the secondary aging time is 12h~48h, the temperature is 20~30℃, and the humidity is 70%~90%;

[0052] S5. Extrusion molding of wet preform: The wet preform processed in step S4 is extruded into shape; Optionally, the wet preform is fed into the extrusion device and formed into a hollow flat plate shape (600mm×150mm×4mm) through the mold, with an extrusion speed of about 1-2.4m / s adjustable and an extrusion pressure of up to 20 MPa.

[0053] S6. Drying to obtain a dry blank: Place the flat blank prepared in step S5 in a ventilated place at room temperature and dry for 24 h to 120 h to obtain a dry blank.

[0054] S7. The dry blank is placed in a kiln and calcined at a temperature of 30~1500℃, a heating rate of 1~5℃ / min, and a calcination time of 2~5 days to obtain an anti-fouling ceramic film.

[0055] The ceramic membrane prepared in this embodiment has the advantages of high water flux, strong antifouling ability, and high flexural strength. Taking the prepared flat plate ceramic membrane as an example, the pure water flux of a single-layer flat plate ceramic membrane can exceed 5000. It is 3 to 5 times stronger than double-layer alumina ceramic membranes; when the prepared ceramic membrane is used in MBR, it has strong anti-fouling ability, and the transmembrane pressure difference growth rate can reach 3.5 kPa / day in 8 days, which is only half that of similar products; the prepared ceramic membrane has a flexural mechanical strength of more than 30 MPa, and can reach up to 52.12 MPa.

[0056] To better illustrate the technical effects of this embodiment, the following specific embodiments are provided:

[0057] Example 1

[0058] An anti-fouling ceramic membrane is composed of the following components in parts by weight:

[0059] 100 parts white corundum powder, 1 part lepidolite powder, 3 parts kaolin powder, 5 parts cellulose powder, 5 parts starch, 1 part potassium feldspar powder, 1 part zirconium dioxide powder, 1 part titanium dioxide powder, 1 part vegetable oil, 1 part engine oil, and 20 parts water.

[0060] The preparation method of the above-mentioned antifouling ceramic membrane includes the following steps:

[0061] S1. Mixing of powders: Take white corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, machine oil and water in a certain ratio of 100:1:3:5:5:1:1:1:1:1:20 and put them into the DX-500B high-speed mixer. Stir for 60 minutes until a wet embryo in the shape of lumps is formed.

[0062] S2. First aging of wet embryos: The wet embryos obtained in step S1 are placed in a constant temperature and humidity environment for a first aging; the first aging time is 24 hours, the temperature is 25℃, and the humidity is 80%;

[0063] S3. Refining of wet slurry: The wet slurry processed in step S2 is fed into a vacuum plow mill for refining. The extrusion pressure is 15 MPa and the system vacuum degree is -0.095 MPa.

[0064] S4. Secondary aging of wet embryos: The wet embryos treated in step S3 are placed in a constant temperature and humidity environment for secondary aging; the secondary aging time is 24 hours, the temperature is 25℃, and the humidity is 80%;

[0065] S5. Extrusion molding of wet preform: The wet preform processed in step S4 is extruded and molded; Optionally, the wet preform is fed into the extrusion device and formed into a hollow flat plate shape (600mm×150mm×4mm) through the mold, with an extrusion speed of about 1m / s and an extrusion pressure of 20 MPa.

[0066] S6. Drying to obtain a dry blank: The flat blank prepared in step S5 is placed in a ventilated place at room temperature and dried for 96 hours to obtain a dry blank.

[0067] S7. The dry blank is placed in a kiln for calcination at a temperature of 30~1500℃ (starting from a low temperature and heating to the maximum temperature at a certain heating rate), with a heating rate of 3℃ / min and a calcination time of 4 days, to obtain an anti-fouling ceramic film.

[0068] Example 2

[0069] This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that the proportions of the components in the antifouling ceramic membrane are different. Specifically:

[0070] An anti-fouling ceramic membrane is composed of the following components in parts by weight:

[0071] 100 parts white corundum powder, 2 parts lepidolite powder, 7 parts kaolin powder, 7 parts cellulose powder, 8 parts starch, 2 parts potassium feldspar powder, 1.5 parts zirconium dioxide powder, 1.5 parts titanium dioxide powder, 8 parts vegetable oil, 1.3 parts machine oil, and 30 parts water.

[0072] Example 3

[0073] This embodiment is based on Embodiment 1, but differs from Embodiment 1 in that the proportions of the components in the antifouling ceramic membrane are different. Specifically:

[0074] An anti-fouling ceramic membrane is composed of the following components in parts by weight:

[0075] 100 parts white corundum powder, 3 parts lepidolite powder, 10 parts kaolin powder, 10 parts cellulose powder, 10 parts starch, 3 parts potassium feldspar powder, 2 parts zirconium dioxide powder, 2 parts titanium dioxide powder, 10 parts vegetable oil, 2 parts machine oil, and 35 parts water.

[0076] Comparative Example 1:

[0077] The preparation of conventional alumina ceramic films includes the following steps:

[0078] (1) Mixing of powders: Take alumina powder, kaolin powder, cellulose powder, carbon powder, machine oil, water and other raw materials, and put them into DX-500B high-speed mixer in a ratio of 100:10:10:8:10:25. Stir for 60 minutes until a wet embryo in the shape of lumps is formed.

[0079] (2) Aging of wet embryos: The above embryos were placed in a constant temperature and humidity environment for 124 hours for aging, with the temperature controlled at 25℃ and the humidity controlled at 80%;

[0080] (3) Refining of wet blanks: The blanks that have completed step (2) are put into a vacuum pug mill for refining, with an extrusion pressure of 15 MPa and a system vacuum of -0.095 MPa;

[0081] (4) Extrusion molding of wet preform: The wet preform completed in step (3) is put into the extrusion device and formed into a hollow flat plate (600mm×150mm×4mm) through the mold. The corresponding extrusion speed is about 1m / s adjustable and the extrusion pressure is 20 MPa.

[0082] (5) First drying: The flat blank obtained in step (4) is placed in a ventilated place at room temperature and dried for 96 h to obtain a dry blank;

[0083] (6) High-temperature calcination: The dry blank obtained in step (5) is placed in a kiln for calcination. The sintering temperature is 30~1500℃, the heating rate is 3℃ / min, the calcination time is 4 days, and the alumina support is obtained after cooling.

[0084] (7) Grinding slurry preparation: First, add 600 g of deionized water, then add 1 g of ceramic dispersant 9300 and stir continuously with a stirrer (300 r / min). Then, slowly add 200 g of potassium feldspar and 1500 g of kaolin while stirring. Finally, add 50 g of calcined talc and stir continuously for 120 min. Add 1 g of defoamer P653 and seal the prepared grinding slurry for storage.

[0085] (8) First, add 100 g of deionized water, then add 20 g of the grinding slurry prepared in step (7) and stir evenly. Next, add 100 g of alumina powder during the stirring process, then add 0.5 g of sodium bicarbonate and 0.5 g of sodium silicate to maintain the pH value of the slurry. Continue stirring and ball milling for 48 h. 30 min before the end of ball milling, add 0.2 g of defoamer P653 and seal the prepared grinding slurry for storage.

[0086] (9) Pour the dip coating slurry prepared in step (8) into a beaker, and vertically immerse the support prepared in step (6) into the slurry at a speed of 50 mm / s. Let it stand for an appropriate time of 1 min, and then pull it out at a uniform speed of 5 cm / s to obtain a wet ceramic film with an intact surface and asymmetric structure.

[0087] (10) Secondary drying: The wet film is placed in a constant temperature and humidity chamber (temperature: 50℃, humidity: 80%) for drying. The film is turned over every 2 hours until it is completely dry, and an asymmetric structure ceramic film green body is obtained.

[0088] (11) Secondary high-temperature calcination: The green embryo obtained in step (10) is placed in a muffle furnace and heated to 30~1500℃ at a heating rate of 3℃ / min in an air environment and held for 4 h. After natural cooling, a double-layer structured alumina ceramic film is obtained.

[0089] Comparative Example 2:

[0090] This comparative example is based on Example 2, but differs from Example 2 in that the antifouling ceramic membrane does not contain lepidolite powder and potassium feldspar powder. Specifically:

[0091] An anti-fouling ceramic membrane is composed of the following components in parts by weight:

[0092] 100 parts white corundum powder, 7 parts kaolin powder, 7 parts cellulose powder, 8 parts starch, 1.5 parts zirconium dioxide powder, 1.5 parts titanium dioxide powder, 8 parts vegetable oil, 1.3 parts machine oil, and 30 parts water.

[0093] Comparative Example 3:

[0094] This comparative example is based on Example 2, but differs from Example 2 in that the antifouling ceramic membrane does not contain zirconium dioxide powder and titanium dioxide powder. Specifically:

[0095] An anti-fouling ceramic membrane is composed of the following components in parts by weight:

[0096] 100 parts white corundum powder, 2 parts lepidolite powder, 7 parts kaolin powder, 7 parts cellulose powder, 8 parts starch, 2 parts potassium feldspar powder, 8 parts vegetable oil, 1.3 parts machine oil, and 30 parts water.

[0097] The antifouling ceramic membranes prepared in Examples 1-3, Comparative Examples 2 and 3, and the alumina ceramic membrane prepared in Comparative Example 1 were subjected to pure water flux test, antifouling performance test, and flexural mechanical strength test.

[0098] The experimental procedure for the pure water flux test is as follows:

[0099] First, immerse all ceramic membrane components in deionized water and clean them for 5 minutes under the action of 20 kHz ultrasound to remove all loose impurities on the surface of the ceramic membrane during the preparation process. Before operation, immerse them for 30 minutes to reduce air bubbles between the pores of the ceramic membrane and maintain stable flux. Then filter with deionized water. After the effluent stabilizes, start measuring the pure water flux according to formula (1).

[0100] (1)

[0101] J is the pure water flux of the ceramic membrane ( V represents the outflow rate (L); A represents the effective membrane surface area (m²). 2 ); t is the filtration time (h); P is the transmembrane pressure (bar).

[0102] The experimental procedure for the anti-pollution performance test is as follows:

[0103] Experimental setup such as Figure 2 As shown, reactor 2 has a 9 L square water tank. Feed water is continuously supplied to reactor 2 via a high-level water tank 1, and the feed water level is maintained constant by a float valve 3. To avoid the influence of activated sludge variability on membrane fouling, two membrane modules 4 with the same effective area are vertically immersed in the same MBR reactor, using two independent peristaltic pumps 6 operating in parallel. The pressure difference generated by the peristaltic pumps 6 causes the mixed liquor to pass through membrane modules 4 to produce effluent, which is then directly extracted from membrane modules 4. A vacuum pressure gauge 5 is installed between membrane modules 4 and peristaltic pumps 6 to monitor transmembrane pressure (TMP).

[0104] During operation, membrane module 4 is hydraulically backwashed once every one or two days to remove reversible fouling. When hydraulic backwashing is insufficient to effectively clean and restore the flux of membrane module 4, chemical cleaning is performed by soaking in sodium hypochlorite (NaClO) to remove the irreversible fouling accumulated on the membrane.

[0105] The experimental procedure for the flexural mechanical strength test is as follows:

[0106] (1) Experimental methods

[0107] According to ASTM C674-88 "Standard Test Method for Bending Properties", the flexural strength of ceramic membranes was tested using the three-point bending method. The test was conducted on a C674-88 electronic universal testing machine. The specific test method is as follows: A ceramic membrane with a length of 130 mm was placed on the lower cylindrical support (D=10 mm) with a spacing of 100 mm. The pressure cylinder (D=10 mm) above the universal testing machine was lowered at a constant speed, and a load was applied at a speed of 5 mm / min until the sample was broken. The maximum load value F (N) during the pressure process was read, and the flexural strength was calculated using formula (2). The average value of the three test results was taken as the flexural strength of the ceramic membrane.

[0108] (2)

[0109] In the formula, σ is the flexural strength (MPa); F is the fracture load (N); L is the span of the lower cylindrical support (mm); b is the width of the fracture surface (mm); and h is the thickness of the fracture surface (mm).

[0110] The experimental results of Examples 1-3, Comparative Example 2, and Comparative Example 3 are shown in Table 1:

[0111] Table 1

[0112]

[0113] The data in Table 1 shows that:

[0114] The antifouling ceramic membrane prepared according to the formulation described in Example 2 has the best effect.

[0115] The performance of the antifouling ceramic membrane prepared in Example 2 and the alumina ceramic membrane prepared in Comparative Example 1 were compared and analyzed.

[0116] The pure water flux of the antifouling ceramic membrane prepared in Example 2 and the alumina ceramic membrane prepared in Comparative Example 1 are compared. Figure 1 As shown:

[0117] The antifouling ceramic membrane prepared in Example 2 has a pure water flux of 5214. The alumina ceramic film prepared in Comparative Example 1 only had a density of 1348. This indicates that the antifouling ceramic membrane prepared in Example 2 of the present invention has a higher pure water flux.

[0118] The antifouling test results of the antifouling ceramic membrane prepared in Example 2 and the alumina ceramic membrane prepared in Comparative Example 1 are compared. Figure 3 As shown in (a):

[0119] Initially (days 1-4), the TMP rise rate of the alumina ceramic membrane was similar to that of the antifouling ceramic membrane, with maximum TMPs reaching 25.4 kPa and 20.0 kPa, respectively. After the initial fouling stage, the TMP of the alumina ceramic membrane increased significantly, reaching 70.2 kPa on day 8, with an increase rate of 11.2 kPa / d. After hydraulic backwashing, the TMP recovered to 25.2 kPa. Subsequently, the TMP increase rate of the alumina ceramic membrane in the MBR (29.8 kPa / d) was also relatively high. Chemical cleaning can eliminate irreversible fouling and further reduce TMP after hydraulic backwashing, but this cannot slow down the TMP development rate of the alumina ceramic membrane. In contrast, the absolute value of the TMP and its growth rate of the antifouling ceramic membrane were significantly lower than those of the alumina ceramic membrane. On day 8, the TMP only increased to 34.2 kPa, with an increase rate of 3.5 kPa / d. The maximum total molecular weight (TMP) of the antifouling ceramic membrane remained consistently around 40 kPa, with an average TMP growth rate of 18.7 kPa / d. Hydraulic backwashing effectively restored the TMP, while chemical cleaning could further reduce it to even lower levels.

[0120] Therefore, the anti-fouling ceramic membrane prepared in Example 2 of the present invention has stronger anti-fouling properties.

[0121] The flexural strength of the antifouling ceramic membrane prepared in Example 2 and the alumina ceramic membrane prepared in Comparative Example 1 are compared. Figure 4 As shown:

[0122] Compared to the alumina ceramic membrane prepared in Comparative Example 1, the antifouling ceramic membrane prepared in Example 2 exhibits significantly higher flexural strength, reaching a maximum of 47.00 MPa, while the alumina ceramic membrane with a similar pore size only reaches 25.67 MPa. This demonstrates that the antifouling ceramic membrane prepared in Example 2 of this invention possesses stronger flexural mechanical strength.

[0123] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. 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. An anti-fouling ceramic membrane, characterized in that, The following components by weight are included: 100 parts of white corundum powder, 1-10 parts of lepidolite powder, 5-15 parts of kaolin powder, 1-15 parts of cellulose powder, 5-20 parts of starch, 1-10 parts of potassium feldspar powder, 1-10 parts of zirconium dioxide powder, 1-10 parts of titanium dioxide powder, 1-15 parts of vegetable oil, 1-10 parts of machine oil, and 10-50 parts of water.

2. The anti-fouling ceramic membrane according to claim 1, wherein, The following components by weight are included: 100 parts of white corundum powder, 1-3 parts of lepidolite powder, 5-10 parts of kaolin powder, 5-10 parts of cellulose powder, 5-10 parts of starch, 1-3 parts of potassium feldspar powder, 1-2 parts of zirconium dioxide powder, 1-2 parts of titanium dioxide powder, 1-10 parts of vegetable oil, 1-2 parts of machine oil, and 20-30 parts of water.

3. The method for preparing the antifouling ceramic membrane as described in claim 1 or 2, characterized in that, The following steps are included: S1, mixing of the powder: white corundum powder, lepidolite powder, kaolin powder, cellulose powder, starch, potassium feldspar powder, zirconium dioxide powder, titanium dioxide powder, vegetable oil, machine oil, and water are mixed and stirred until a wet embryo in the form of a lump is formed; S2, first aging of the wet embryo: the wet embryo obtained in step S1 is placed in a constant temperature and humidity environment for first aging; S3, refining of the wet embryo: the wet embryo treated in step S2 is refined in a vacuum environment; S4, second aging of the wet embryo: the wet embryo treated in step S3 is placed in a constant temperature and humidity environment for second aging; S5, extrusion molding of the wet embryo: the wet embryo treated in step S4 is extruded and molded; S6, drying to obtain a dry blank; S7, high temperature calcination of the dry blank to obtain a ceramic membrane.

4. The production method according to claim 3, characterized by, In step S2, the first aging time is 12-48 h, the temperature is 20-30℃, and the humidity is 70%-90%.

5. The preparation method according to claim 3, characterized in that, In step S4, the second aging time is 12-48 h, the temperature is 20-30℃, and the humidity is 70%-90%.

6. The preparation method according to claim 3, characterized in that, In step S6, the drying method is room temperature ventilation drying, and the time is 24-120 h.

7. The preparation method according to claim 3, characterized in that, In step S7, the high temperature calcination temperature is 30-1500℃, the heating starts from low temperature, the heating rate is 1-5℃ / min to the highest temperature, and the calcination time is 2-5 days.

8. Use of the anti-pollution ceramic membrane according to claim 1 or 2 in water treatment.

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