A foamed ceramic-based biofilm carrier and a preparation method and application thereof

Abstract

The application discloses a kind of foam ceramic-based biofilm carrier and preparation method thereof, and the application is more excellent in dispersibility and compatibility by adding modified lithium bentonite and modified activated carbon, to promote the foam ceramic-based biofilm carrier with better quality, which can significantly increase the biological affinity of the system, help to improve the biofilm efficiency and quality, and after high-energy radiation, more active sites are generated on the surface, enhancing the interaction with silane coupling agent, thereby improving the degree of surface functionalization, with higher application stability;By adding a specific binder, it helps to form a more stable cross-linked structure, and synergistically acts with the reinforcing filler, making the application mechanical properties of the foam ceramic-based biofilm carrier more excellent, and overall, a foam ceramic-based biofilm carrier with better mechanical strength and biological affinity is obtained, which is applied to the treatment of sewage by biofilm method, with excellent biofilm rate, biofilm stability and adhesion, thereby making the sewage treatment effect more significant.

Description

Technical Field

[0001] This invention relates to the field of biofilm carrier technology, and more specifically, to a foam ceramic-based biofilm carrier, its preparation method, and its application. Background Technology

[0002] In intensive aquaculture, high stocking densities and large feed inputs lead to water quality deterioration due to food residues and daily fish excrement. This negatively impacts the normal growth and quality of aquatic products, even causing suffocation and death. Furthermore, direct discharge of wastewater increases the organic matter content of the water, resulting in eutrophication and ecological imbalance. Therefore, pollution control in aquaculture areas is a crucial aspect of ecological protection, and effective water purification is a key issue that aquaculture needs to address.

[0003] Existing technologies utilize biofilms to purify water. The most commonly used wastewater treatment technology is the biofilm method, which uses microorganisms (i.e., biofilms) attached to the surface of certain solid materials to treat organic wastewater. This technology involves microorganisms attaching to a carrier surface. As wastewater flows over the carrier surface, pollutants are decomposed through the adsorption of organic nutrients, the diffusion of oxygen into the biofilm, and biological oxidation within the membrane, thus achieving wastewater purification. Research shows that the water treatment effect of biofilms is closely related to the structure and performance of the carrier. The surface structure and properties of the biofilm carrier are the main factors affecting microbial attachment; a suitable carrier plays a decisive role in biofilm growth, thereby affecting the water treatment effect. Currently, the main types of biofilm carriers used in China are inorganic biofilm carriers, organic biofilm carriers, and natural biodegradable polymer biofilm carriers. However, in existing biofilm methods for wastewater treatment, there are problems such as poor mechanical strength and biocompatibility of the carrier materials, resulting in long biofilm formation cycles, difficulties in biofilm formation, and poor adhesion. Summary of the Invention

[0004] Therefore, in order to address the problems of poor mechanical strength and biocompatibility of carrier materials in existing biofilm methods for wastewater treatment, resulting in long biofilm formation cycles, difficulties in biofilm formation, and poor adhesion, this invention provides a foam ceramic-based biofilm carrier, its preparation method, and its application. The specific technical solution is as follows:

[0005] A foam ceramic-based biofilm carrier, comprising the following components in parts by weight: 30-40 parts ceramic powder, 35-40 parts modified lithium-based bentonite, 9-12 parts modified activated carbon, 0-10 parts reinforcing filler, 3-7 parts pore-forming agent, 1-5 parts binder, 0-3 parts stabilizer, and 1-3 parts dispersant.

[0006] The modified lithium-based bentonite is prepared by soaking lithium-based bentonite in sodium hydroxide solution for 1 to 3 hours, ultrasonically treating it for 5 to 10 minutes, then adding N,N'-methylenebisacrylamide and stirring for 30 to 45 minutes to obtain modified lithium-based bentonite.

[0007] The modified activated carbon is prepared by heat treatment, cooling, and then adding it to anhydrous ethanol using high-energy radiation. The mixture is then ultrasonically dispersed, followed by the addition of a silane coupling agent. The mixture is heated to 55°C–80°C under a nitrogen atmosphere and stirred. After the reaction is complete, the mixture is repeatedly washed with anhydrous ethanol and dried to obtain the modified activated carbon.

[0008] Furthermore, the reinforcing filler is at least one of sodium feldspar, potassium feldspar, halloysite, and short-cut mullite polycrystalline fibers.

[0009] Furthermore, the pore-forming agent is at least one of sodium bicarbonate, ammonium bicarbonate, ammonium chloride, and silicon nitride.

[0010] Furthermore, the adhesive is composed of boric acid and polyvinyl alcohol in a mass ratio of (1-5):(1-2).

[0011] Furthermore, the stabilizer is at least one selected from magnesium oxide, yttrium oxide, cerium oxide, lanthanum oxide, and zirconium oxide.

[0012] Furthermore, the dispersant is at least one selected from sodium hexametaphosphate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide.

[0013] Furthermore, the volume ratio of the lithium-based bentonite to the sodium hydroxide solution is 1:(10-15).

[0014] Furthermore, the amount of N,N'-methylenebisacrylamide added accounts for 8% to 15% of the mass of the lithium-based bentonite.

[0015] In addition, the present invention also provides a method for preparing a foam ceramic-based biofilm carrier, the preparation method comprising the following steps:

[0016] Ceramic powder, modified lithium-based bentonite, modified activated carbon, reinforcing filler, stabilizer and dispersant are mixed and then wet-milled in a planetary ball mill for 30 min to 60 min. The mixture is then sieved to obtain a slurry with a mesh size of 80 to 100 mesh.

[0017] Under stirring conditions, the pore-forming agent and binder are added to the slurry. After stirring for 20 to 30 minutes, the slurry is added to a mold and pressed into a blank. The temperature is increased to 300 to 500°C at a rate of 2°C to 5°C and held for 1 to 2 hours. Then, the temperature is increased to 1000 to 1220°C at a rate of 10°C to 15°C and held for 30 to 45 minutes. After molding, a foam ceramic-based biofilm carrier is obtained.

[0018] This invention relates to the application of a foam ceramic-based biofilm carrier, specifically its application in the field of biofilm-based wastewater treatment.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This invention uses optimized composition and component ratio of foam ceramic-based biofilm carriers, which helps to obtain foam ceramic-based biofilm carriers with better mechanical strength and biocompatibility. When applied to wastewater treatment by biofilm method, it effectively improves biofilm attachment efficiency, and the biofilm is stable, has excellent adhesion, and high microbial activity, thus making the wastewater treatment effect more significant.

[0021] 2. The lithium-based bentonite and activated carbon of the present invention are modified to have better dispersibility and compatibility, increased surface micropores and roughness, providing more anchoring sites for microorganisms or cells, promoting adhesion and proliferation, significantly increasing the biocompatibility of the system, helping to improve the efficiency and quality of biofilm formation, and after high-energy radiation, more active sites are generated on the surface, enhancing the interaction with silane coupling agents, thereby improving the degree of surface functionalization and application stability.

[0022] 3. The addition of specific adhesives in this invention helps the system form a more stable cross-linked structure and works synergistically with the reinforcing filler, resulting in superior mechanical properties of the foam ceramic-based biofilm carrier and improved wastewater purification effect due to the porous structure. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] An embodiment of the present invention provides a foam ceramic-based biofilm carrier, which comprises the following components in parts by weight: 30-40 parts ceramic powder, 35-40 parts modified lithium-based bentonite, 9-12 parts modified activated carbon, 0-10 parts reinforcing filler, 3-7 parts pore-forming agent, 1-5 parts binder, 0-3 parts stabilizer, and 1-3 parts dispersant.

[0026] The modified lithium-based bentonite is prepared by soaking lithium-based bentonite in sodium hydroxide solution for 1 to 3 hours, ultrasonically treating it for 5 to 10 minutes, then adding N,N'-methylenebisacrylamide and stirring for 30 to 45 minutes to obtain modified lithium-based bentonite.

[0027] The modified activated carbon is prepared by heat treatment, cooling, and then adding it to anhydrous ethanol using high-energy radiation. The mixture is then ultrasonically dispersed, followed by the addition of a silane coupling agent. The mixture is heated to 55°C–80°C under a nitrogen atmosphere and stirred. After the reaction is complete, the mixture is repeatedly washed with anhydrous ethanol and dried to obtain the modified activated carbon.

[0028] In one embodiment, the ceramic powder is at least one of barium titanate ceramic powder and alumina ceramic powder.

[0029] In one embodiment, the reinforcing filler is at least one of sodium feldspar, potassium feldspar, halloysite, and short-cut mullite polycrystalline fibers.

[0030] In one embodiment, the pore-forming agent is at least one of sodium bicarbonate, ammonium bicarbonate, ammonium chloride, and silicon nitride.

[0031] In one embodiment, the adhesive is composed of boric acid and polyvinyl alcohol in a mass ratio of (1-5):(1-2).

[0032] In one embodiment, the stabilizer is at least one selected from magnesium oxide, yttrium oxide, cerium oxide, lanthanum oxide, and zirconium oxide.

[0033] In one embodiment, the dispersant is at least one of sodium hexametaphosphate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide.

[0034] In one embodiment, the volume ratio of the lithium-based bentonite to the sodium hydroxide solution is 1:(10-15).

[0035] In one embodiment, the amount of N,N'-methylenebisacrylamide added is 8% to 15% of the mass of the lithium-based bentonite.

[0036] In one embodiment, the sodium hydroxide solution has a mass percentage concentration of 3% to 7%.

[0037] In one embodiment, the heat treatment temperature is 300°C to 350°C and the time is 30 min to 45 min.

[0038] In one embodiment, the high-energy radiation conditions are: a radiation dose of 10 kGy to 20 kGy and a duration of 10 s to 30 s.

[0039] In one embodiment, the ultrasonic dispersion time is 10 min to 15 min.

[0040] In one embodiment, the amount of silane coupling agent added is 5% to 15% of the mass of activated carbon.

[0041] In one embodiment, the reaction time is 3 to 5 hours.

[0042] In one embodiment, the drying process is carried out at a temperature of 75°C to 85°C for a time of 20 min to 30 min.

[0043] In addition, the present invention also provides a method for preparing a foam ceramic-based biofilm carrier, the preparation method comprising the following steps:

[0044] Ceramic powder, modified lithium-based bentonite, modified activated carbon, reinforcing filler, stabilizer and dispersant are mixed and then wet-milled in a planetary ball mill for 30 min to 60 min. The mixture is then sieved to obtain a slurry with a mesh size of 80 to 100 mesh.

[0045] Under stirring conditions, the pore-forming agent and binder are added to the slurry. After stirring for 20 to 30 minutes, the slurry is added to a mold and pressed into a blank. The temperature is increased to 300 to 500°C at a rate of 2°C to 5°C and held for 1 to 2 hours. Then, the temperature is increased to 1000 to 1220°C at a rate of 10°C to 15°C and held for 30 to 45 minutes. After molding, a foam ceramic-based biofilm carrier is obtained.

[0046] This invention relates to the application of a foam ceramic-based biofilm carrier, specifically its application in the field of biofilm-based wastewater treatment.

[0047] The foam ceramic-based biofilm carrier obtained by the above scheme has better mechanical strength and biocompatibility, which can effectively improve the biofilm attachment efficiency, and the biofilm is stable, has excellent adhesion, and high microbial activity, thus achieving a more significant wastewater treatment effect.

[0048] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0049] Example 1:

[0050] A method for preparing a foam ceramic-based biofilm carrier includes the following steps:

[0051] The lithium-based bentonite was added to a 5% sodium hydroxide solution at a volume ratio of 1:10 and soaked for 2 hours. It was then ultrasonically treated for 5 minutes. Then, N,N'-methylenebisacrylamide, accounting for 10% of the mass of the lithium-based bentonite, was added and stirred for 30 minutes to obtain modified lithium-based bentonite.

[0052] Activated carbon was heat-treated at 300℃ for 40 min. After cooling, it was subjected to high-energy radiation with a dose of 10 kGy for 12 s. Then, it was added to anhydrous ethanol and ultrasonically dispersed for 10 min. Then, silane coupling agent with an addition amount of 10% of the weight of activated carbon was added. Under a nitrogen atmosphere, it was heated to 65℃ and stirred. After the reaction was completed for 4 h, it was repeatedly washed with anhydrous ethanol and dried at 75℃ for 30 min to obtain modified activated carbon.

[0053] By weight, 35 parts of barium titanate ceramic powder, 38 parts of modified lithium-based bentonite, 10 parts of modified activated carbon, 5 parts of sodium feldspar, 1 part of magnesium oxide and 3 parts of sodium dodecyl sulfate are mixed and then wet-milled in a planetary ball mill for 45 minutes. The mixture is then sieved to obtain a slurry with a 100-mesh sieve.

[0054] Under stirring conditions, 5 parts ammonium bicarbonate and 3 parts binder (composed of boric acid and polyvinyl alcohol in a mass ratio of 1:2) were added to the slurry. After stirring for 25 minutes, the mixture was added to a mold and pressed into a green body. The temperature was increased to 300°C at a heating rate of 5°C and held for 2 hours. Then, the temperature was increased to 1200°C at a heating rate of 10°C and held for 30 minutes. After molding, a foam ceramic-based biofilm carrier was obtained.

[0055] Example 2:

[0056] A method for preparing a foam ceramic-based biofilm carrier includes the following steps:

[0057] The lithium-based bentonite was added to a 5% sodium hydroxide solution at a volume ratio of 1:10 and soaked for 3 hours. It was then ultrasonically treated for 8 minutes. N,N'-methylenebisacrylamide, accounting for 12% of the mass of the lithium-based bentonite, was added and stirred for 35 minutes to obtain modified lithium-based bentonite.

[0058] Activated carbon was heat-treated at 320℃ for 30 min, cooled, and then subjected to high-energy radiation at a dose of 10 kGy for 12 s. It was then added to anhydrous ethanol and ultrasonically dispersed for 10 min. Silane coupling agent at 12% of the activated carbon mass was then added. The mixture was heated to 70℃ under a nitrogen atmosphere and stirred. After reacting for 4 h, the carbon was repeatedly washed with anhydrous ethanol and dried at 75℃ for 30 min to obtain modified activated carbon.

[0059] By weight, 36 parts of barium titanate ceramic powder, 35 parts of modified lithium-based bentonite, 12 parts of modified activated carbon, 6 parts of potassium feldspar, 1 part of magnesium oxide and 2 parts of sodium dodecyl sulfate were mixed and then wet-milled in a planetary ball mill for 35 minutes. The mixture was then sieved to obtain a slurry with a 100-mesh sieve.

[0060] Under stirring conditions, 6 parts of sodium bicarbonate and 3 parts of binder (composed of boric acid and polyvinyl alcohol in a mass ratio of 1:2) were added to the slurry. After stirring for 30 minutes, the mixture was added to a mold and pressed into a green body. The temperature was increased to 350°C at a heating rate of 5°C and held for 2 hours. Then, the temperature was increased to 1150°C at a heating rate of 10°C and held for 35 minutes. After molding, a foam ceramic-based biofilm carrier was obtained.

[0061] Example 3:

[0062] A method for preparing a foam ceramic-based biofilm carrier includes the following steps:

[0063] The lithium-based bentonite was added to a 5% sodium hydroxide solution at a volume ratio of 1:10 and soaked for 3 hours. It was then ultrasonically treated for 10 minutes. N,N'-methylenebisacrylamide, accounting for 11% of the mass of the lithium-based bentonite, was added and stirred for 40 minutes to obtain modified lithium-based bentonite.

[0064] Activated carbon was heat-treated at 350℃ for 30 min. After cooling, it was subjected to high-energy radiation with a dose of 10 kGy for 12 s. Then, it was added to anhydrous ethanol and ultrasonically dispersed for 10 min. Then, silane coupling agent with an addition amount of 10% of the weight of activated carbon was added. Under a nitrogen atmosphere, it was heated to 65℃ and stirred. After the reaction was completed for 5 h, it was repeatedly washed with anhydrous ethanol and dried at 75℃ for 30 min to obtain modified activated carbon.

[0065] By weight, 40 parts of barium titanate ceramic powder, 39 parts of modified lithium-based bentonite, 10 parts of modified activated carbon, 7 parts of potassium feldspar, 1 part of cerium oxide and 3 parts of sodium hexametaphosphate were mixed and then wet-milled in a planetary ball mill for 45 minutes. The mixture was then sieved to obtain a slurry with a 100-mesh sieve.

[0066] Under stirring conditions, 7 parts sodium bicarbonate and 4 parts binder (composed of boric acid and polyvinyl alcohol in a mass ratio of 2:2) were added to the slurry. After stirring for 25 minutes, the mixture was added to a mold and pressed into a blank. The temperature was increased to 350°C at a heating rate of 5°C and held for 2 hours. Then, the temperature was increased to 1200°C at a heating rate of 12°C and held for 30 minutes. After molding, a foam ceramic-based biofilm carrier was obtained.

[0067] Comparative Example 1:

[0068] Compared with Example 3, the preparation method of modified lithium-based bentonite in Comparative Example 1 did not include N,N'-methylenebisacrylamide, but was otherwise the same as in Example 3.

[0069] Comparative Example 2:

[0070] Compared with Example 3, no modified lithium-based bentonite was added in Comparative Example 2, but everything else was the same as in Example 3.

[0071] Comparative Example 3:

[0072] Compared with Example 3, the modified activated carbon in Comparative Example 3 was prepared without heat treatment, but otherwise the same as in Example 3.

[0073] Comparative Example 4:

[0074] Compared with Example 3, the preparation method of the modified activated carbon in Comparative Example 4 did not involve high-energy radiation, but was otherwise the same as in Example 3.

[0075] Comparative Example 5:

[0076] Compared with Example 3, the preparation method of the modified activated carbon in Comparative Example 5 did not add a silane coupling agent, but was otherwise the same as in Example 3.

[0077] Comparative Example 6:

[0078] Compared with Example 3, no modified activated carbon was added in Comparative Example 6, but everything else was the same as in Example 3.

[0079] Comparative Example 7:

[0080] Compared with Example 3, Comparative Example 7 did not add (potassium feldspar) reinforcing filler, but was otherwise the same as Example 3.

[0081] Comparative Example 8:

[0082] Compared to Example 3, Comparative Example 8 uses polyvinyl alcohol as the adhesive, but otherwise remains the same as Example 3.

[0083] The performance of the foam ceramic-based biofilm carrier samples prepared in Examples 1-3 and the comparative samples prepared in Comparative Examples 1-8 were tested, and the results are shown in Table 1 below.

[0084] Table 1: Performance Test Results

[0085]

[0086]

[0087] As can be seen from the data analysis in Table 1, by optimizing the composition and component ratio, this invention can obtain a foam ceramic-based biofilm carrier with satisfactory mechanical properties and porosity. Compared to Example 3, in Comparative Example 1, the preparation method of modified lithium-based bentonite did not include N,N'-methylenebisacrylamide, resulting in reduced porosity and weakened cross-linking of the system, which also affected the strength of the structure. In Comparative Example 2, the absence of modified lithium-based bentonite weakened the supporting effect, but the foam ceramic-based biofilm carrier was denser, increasing compressive strength. However, the low porosity affected the biofilm formation effect. The different preparation methods of modified activated carbon in Comparative Examples 3-5 indicate that heat treatment, high-energy radiation, and the addition of silane coupling agents all affect the surface active sites of activated carbon, affecting the foaming effect and leading to changes in the compressive strength of the material. In Comparative Example 6, the absence of modified activated carbon resulted in a significant decrease in porosity, indicating that modified activated carbon helps to improve porosity. In Comparative Example 7, the absence of (potassium feldspar) reinforcing filler significantly reduced the compressive strength of the system, indicating that appropriate addition of reinforcing filler can improve the strength of the system while maintaining porosity. In Comparative Example 8, the addition of polyvinyl alcohol as a binder reduced the degree of cross-linking, resulting in a significant decrease in application strength. In summary, the components of this invention interact with each other, and the resulting foam ceramic-based biofilm carrier can be applied to the field of biofilm wastewater treatment technology.

[0088] The foam ceramic-based biofilm carrier samples prepared in Examples 1-3 and the comparative samples prepared in Comparative Examples 1-8 were applied to wastewater treatment using the biofilm method. They were placed in wastewater under the same conditions, and sludge was cultivated using intermittent aeration, with the aerobic to anaerobic time ratio controlled at approximately 3:1. The biofilm formation in each group was observed daily, and the effluent COD, TP, and color were monitored. The biofilm formation on the packing material was considered to have reached a stable state when the daily effluent indicators stabilized. The effluent standard referenced GB5084-2005. The application performance test results are shown in Table 2.

[0089] Table 2: Application Performance Test Results

[0090]

[0091] As can be seen from the data analysis in Table 2, the present invention significantly improves the biofilm formation time and the removal rates of COD, TP, and ammonia nitrogen in wastewater through the composition and optimization of the components, and has broad application prospects.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A foam ceramic-based biofilm carrier, characterized in that, The foam ceramic-based biofilm carrier comprises the following components in parts by weight: 30-40 parts ceramic powder, 35-40 parts modified lithium-based bentonite, 9-12 parts modified activated carbon, 0-10 parts reinforcing filler, 3-7 parts pore-forming agent, 1-5 parts binder, 0-3 parts stabilizer, and 1-3 parts dispersant. The modified lithium-based bentonite is prepared by soaking lithium-based bentonite in sodium hydroxide solution for 1-3 hours, ultrasonically treating it for 5-10 minutes, then adding N,N'-methylenebisacrylamide and stirring for 30-45 minutes to obtain modified lithium-based bentonite. The modified activated carbon is prepared as follows: the activated carbon is heat-treated at a temperature of 300℃~350℃ for 30min~45min. After cooling, it is subjected to high-energy radiation at a dose of 10 kGy~20 kGy for 10s~30s. Then, it is added to anhydrous ethanol and ultrasonically dispersed. Then, a silane coupling agent is added, and the mixture is heated to 55℃~80℃ under a nitrogen atmosphere and stirred. After the reaction is completed, the mixture is repeatedly washed with anhydrous ethanol and dried to obtain the modified activated carbon. The adhesive is composed of boric acid and polyvinyl alcohol in a mass ratio of (1~5):(1~2).

2. The foam ceramic-based biofilm carrier according to claim 1, characterized in that, The reinforcing filler is at least one of sodium feldspar, potassium feldspar, halloysite, and short-cut mullite polycrystalline fibers.

3. The foam ceramic-based biofilm carrier according to claim 1, characterized in that, The pore-forming agent is at least one of sodium bicarbonate, ammonium bicarbonate, ammonium chloride, and silicon nitride.

4. The foam ceramic-based biofilm carrier according to claim 1, characterized in that, The stabilizer is at least one of magnesium oxide, yttrium oxide, cerium oxide, lanthanum oxide, and zirconium oxide.

5. The foam ceramic-based biofilm carrier according to claim 1, characterized in that, The dispersant is at least one of sodium hexametaphosphate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide.

6. The foam ceramic-based biofilm carrier according to claim 1, characterized in that, The volume ratio of lithium-based bentonite to sodium hydroxide solution is 1:(10~15).

7. The foam ceramic-based biofilm carrier according to claim 1, characterized in that, The amount of N,N'-methylenebisacrylamide added accounts for 8% to 15% of the mass of the lithium-based bentonite.

8. A method for preparing a foam ceramic-based biofilm carrier, characterized in that, The preparation method is used to prepare the foam ceramic-based biofilm carrier as described in any one of claims 1 to 7, and the preparation method includes the following steps: Ceramic powder, modified lithium-based bentonite, modified activated carbon, reinforcing filler, stabilizer and dispersant are mixed and then wet-milled in a planetary ball mill for 30 min to 60 min. The mixture is then sieved to obtain a slurry that passes through an 80 to 100 mesh sieve. Under stirring conditions, the pore-forming agent and binder are added to the slurry. After stirring for 20 to 30 minutes, the slurry is added to a mold and pressed into a blank. The temperature is increased to 300 to 500°C at a rate of 2°C to 5°C and held for 1 to 2 hours. Then, the temperature is increased to 1000 to 1220°C at a rate of 10°C to 15°C and held for 30 to 45 minutes. After molding, a foam ceramic-based biofilm carrier is obtained.

9. An application of a foam ceramic-based biofilm carrier, characterized in that, The application is the application of the foam ceramic-based biofilm carrier as described in any one of claims 1 to 7 in the field of biofilm wastewater treatment technology.

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