Foamed ceramic-based biofilm carrier as well as preparation method and application thereof

Abstract

According to the foamed ceramic-based biofilm carrier and the preparation method thereof, modified lithium-based bentonite and modified activated carbon are added, so that the dispersity and compatibility are more excellent, the foamed ceramic-based biofilm carrier with better quality is promoted to be obtained, and the biocompatibility of a system can be obviously improved; the method has the advantages that biofilm culturing efficiency and biofilm culturing quality can be improved, more active sites are generated on the surface after high-energy radiation, interaction with a silane coupling agent is enhanced, surface functionalization degree is increased, and application stability is higher; by adding the specific adhesive, the system can form a more stable cross-linked structure, and the cross-linked structure and the reinforcing filler have a synergistic effect, so that the application mechanical property of the foamed ceramic-based biofilm carrier is more excellent, the foamed ceramic-based biofilm carrier with better mechanical strength and biocompatibility is obtained on the whole, the foamed ceramic-based biofilm carrier is applied to biofilm process sewage treatment, and the service life of the foamed ceramic-based biofilm carrier is prolonged. The biofilm culturing rate, the biofilm culturing stability and the adhesive force are excellent, so that the sewage treatment effect is more remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of biofilm carriers, and in particular, to a foam ceramic-based biofilm carrier, a preparation method thereof, and an application thereof. Background Art

[0002] During the intensive aquaculture process, due to the high stocking density and high bait input, food residues and feces discharged by fish every day cause water quality deterioration. On the one hand, it affects the normal growth of aquatic products and the quality of aquatic products, and even causes suffocation and death of aquatic products. On the other hand, the direct discharge of tail water will cause the increase of organic matter content in the water body, resulting in water eutrophication and ecological imbalance in the aquaculture water area. Therefore, the treatment of aquaculture water pollution is a key link in ecological protection, and how to improve water purification is a key issue that needs to be solved in aquaculture.

[0003] In the prior art, biofilms are used to purify water quality. The commonly used sewage treatment technology in the prior art is the biofilm method, which uses microorganisms (i.e., biofilms) attached to the surface of certain solids to treat organic sewage. This technology enables microorganisms to attach to the surface of the carrier. During the process of sewage flowing through the surface of the carrier, through the adsorption of organic nutrients, the diffusion of oxygen into the interior of the biofilm, and the biological oxidation occurring in the film, etc., the pollutants are decomposed to achieve the purpose of purifying sewage. Research shows that the water quality treatment effect of the biofilm 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 the attachment of microorganisms. A suitable carrier plays a decisive role in the growth of the biofilm, thereby affecting the water quality treatment effect. Currently, the biofilm carriers used in China mainly include three categories: inorganic biofilm carriers, organic biofilm carriers, and natural degradable polymer biofilm carriers. However, in the process of sewage treatment by the biofilm method in the prior art, there are problems such as poor mechanical strength and biocompatibility of the carrier material, resulting in a long biofilm formation cycle of the biofilm, difficult biofilm formation, and poor adhesion. Summary of the Invention

[0004] Based on this, in order to solve the problems in the prior art that in the process of sewage treatment by the biofilm method, the mechanical strength and biocompatibility of the carrier material are poor, resulting in a long biofilm formation cycle of the biofilm, difficult biofilm formation, and poor adhesion, the present invention provides a foam ceramic-based biofilm carrier, a preparation method thereof, and an application thereof. The specific technical solutions are as follows:

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

[0006] Among them, the preparation method of the modified lithium-based bentonite is as follows: Add the lithium-based bentonite to a sodium hydroxide solution and soak for 1 h to 3 h, perform ultrasonic treatment for 5 min to 10 min, then add N,N'-methylenebisacrylamide, and stir for 30 min to 45 min to obtain the modified lithium-based bentonite;

[0007] The preparation method of the modified activated carbon is as follows: Heat-treat the activated carbon, after cooling, use high-energy radiation, then add it to absolute ethanol, perform ultrasonic dispersion, then add a silane coupling agent, heat to 55 °C to 80 °C under a nitrogen atmosphere, stir, and after the reaction ends, wash repeatedly with absolute ethanol, and after drying treatment, obtain the modified activated carbon.

[0008] Further, the reinforcing filler is at least one of albite, orthoclase, halloysite, and short chamosite polycrystalline fiber.

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

[0010] Further, the binder is composed of boric acid and polyvinyl alcohol with a mass ratio of (1 to 5):(1 to 2).

[0011] Further, the stabilizer is at least one of magnesium oxide, yttrium oxide, cerium oxide, lanthanum oxide, and zirconium oxide.

[0012] Further, the dispersant is at least one of sodium hexametaphosphate, sodium dodecyl sulfate, and cetyltrimethylammonium bromide.

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

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

[0015] In addition, the present invention also provides a preparation method of a foam ceramic-based biofilm carrier, and the preparation method includes the following steps:

[0016] Mix ceramic powder, modified lithium-based bentonite, modified activated carbon, reinforcing filler, stabilizer, and dispersant, then perform wet ball milling in a planetary ball mill for 30 min to 60 min, and sieve to obtain a slurry with a mesh size of 80 to 100 meshes;

[0017] Under stirring conditions, the pore-forming agent and the binder are added to the slurry. After stirring for 20 min to 30 min, it is added to the template and pressed into a green body. It is heated to 300°C to 500°C at a heating rate of 2°C to 5°C and held for 1 h to 2 h. Then, it is heated to 1000°C to 1220°C at a heating rate of 10°C to 15°C and held for 30 min to 45 min. After forming, a foam ceramic-based biofilm carrier is obtained.

[0018] An application of a foam ceramic-based biofilm carrier according to the present invention, wherein the application is the application of the foam ceramic-based biofilm carrier in the technical field of biofilm method wastewater treatment.

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

[0020] 1. By optimizing the composition and the component ratio of the foam ceramic-based biofilm carrier, the present invention helps to obtain a foam ceramic-based biofilm carrier with better mechanical strength and biocompatibility. When it is applied to sewage treatment by the biofilm method, the film hanging efficiency of the biofilm is effectively improved, and the film hanging is stable, the adhesion is excellent, and the microbial activity is high, thereby making the sewage treatment effect more remarkable.

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

[0022] 3. Adding a specific binder in the present invention helps the system to form a more stable cross-linked structure and acts synergistically with the reinforcing filler, making the mechanical properties of the application of the foam ceramic-based biofilm carrier more excellent, and the porous structure helps to improve the sewage purification effect. Detailed Embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

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

[0026] Wherein, the preparation method of the modified lithium-based bentonite is: adding lithium-based bentonite into sodium hydroxide solution and soaking for 1 h to 3 h, ultrasonic treatment for 5 min to 10 min, then adding N,N'-methylenebisacrylamide, and stirring for 30 min to 45 min to obtain modified lithium-based bentonite;

[0027] The preparation method of the modified activated carbon is: performing heat treatment on the activated carbon, after cooling, using high-energy radiation, then adding it into absolute ethanol, ultrasonic dispersion, then adding silane coupling agent, heating to 55 °C to 80 °C under nitrogen atmosphere, stirring, after the reaction ends, washing repeatedly with absolute ethanol, and drying to obtain 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 albite, orthoclase, halloysite, and short chamosite polycrystalline fiber.

[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 binder is composed of boric acid and polyvinyl alcohol with a mass ratio of (1 to 5):(1 to 2).

[0032] In one embodiment, the stabilizer is at least one of 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 cetyltrimethylammonium bromide.

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

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

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

[0037] In one embodiment, the temperature of the heat treatment 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: the radiation dose is 10 kGy to 20 kGy, and the time is 10 s to 30 s.

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

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

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

[0042] In one embodiment, the temperature of the drying treatment is 75°C to 85°C, and the time is 20 min to 30 min.

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

[0044] Mix ceramic powder, modified lithium-based bentonite, modified activated carbon, reinforcing filler, stabilizer, and dispersant, then wet ball mill in a planetary ball mill for 30 min to 60 min, and screen to obtain a slurry with a mesh size of 80 to 100.

[0045] Under stirring conditions, add a pore-forming agent and a binder to the slurry, stir for 20 min to 30 min, then add it to a mold, press it into a green body, heat it at a heating rate of 2°C to 5°C to 300°C to 500°C, keep it warm for 1 h to 2 h, and then heat it at a heating rate of 10°C to 15°C to 1000°C to 1220°C, and keep it warm for 30 min to 45 min. After forming, a foam ceramic-based biofilm carrier is obtained.

[0046] The present invention relates to an application of a foam ceramic-based biofilm carrier, and the application is the application of the foam ceramic-based biofilm carrier in the technical field of biofilm method wastewater treatment.

[0047] The foam ceramic-based biofilm carrier obtained by the above solution has better mechanical strength and biocompatibility, can effectively improve the film hanging efficiency of the biofilm, has stable film hanging, excellent adhesion, high activity of microorganisms, and can exert a more significant sewage treatment effect.

[0048] Next, specific embodiments will be used to describe the implementation scheme of the present invention in detail.

[0049] Example 1:

[0050] A preparation method of a foam ceramic-based biofilm carrier, comprising the following steps:

[0051] With a liquid material volume ratio of 1:10, add lithium-based bentonite to a sodium hydroxide solution with a mass percentage concentration of 5% and soak for 2 h, perform ultrasonic treatment for 5 min, then add N,N'-methylenebisacrylamide accounting for 10% of the mass of the lithium-based bentonite, and stir for 30 min to obtain modified lithium-based bentonite;

[0052] Heat-treat activated carbon at 300 °C for 40 min. After cooling, use high-energy radiation with a radiation dose of 10 kGy and a time of 12 s, then add it to absolute ethanol, perform ultrasonic dispersion for 10 min, then add a silane coupling agent with an addition amount of 10% of the mass of the activated carbon, heat to 65 °C under a nitrogen atmosphere, stir and react. After 4 h, wash repeatedly with absolute ethanol and dry at 75 °C for 30 min to obtain modified activated carbon;

[0053] By weight, mix 35 parts of barium titanate ceramic powder, 38 parts of modified lithium-based bentonite, 10 parts of modified activated carbon, 5 parts of albite, 1 part of magnesium oxide, and 3 parts of sodium dodecyl sulfate, and then perform wet ball milling in a planetary ball mill for 45 min and sieve to obtain a slurry with a 100-mesh sieve;

[0054] Under stirring conditions, add 5 parts of ammonium bicarbonate and 3 parts of a binder (composed of boric acid and polyvinyl alcohol with a mass ratio of 1:2) to the slurry, stir for 25 min, then add it to a mold, press into a green body, heat at a heating rate of 5 °C to 300 °C, hold for 2 h, then heat at a heating rate of 10 °C to 1200 °C and hold for 30 min. After forming, a foam ceramic-based biofilm carrier is obtained.

[0055] Example 2:

[0056] A preparation method of a foam ceramic-based biofilm carrier, comprising the following steps:

[0057] With a liquid material volume ratio of 1:10, add lithium-based bentonite to a sodium hydroxide solution with a mass percentage concentration of 5% and soak for 3 h, perform ultrasonic treatment for 8 min, then add N,N'-methylenebisacrylamide accounting for 12% of the mass of the lithium-based bentonite, and stir for 35 min to obtain modified lithium-based bentonite;

[0058] The activated carbon was heat-treated at 320 °C for 30 min. After cooling, high-energy radiation with a radiation dose of 10 kGy and a time of 12 s was applied, and then it was added to absolute ethanol and ultrasonically dispersed for 10 min. Then, a silane coupling agent with an addition amount of 12% of the mass of the activated carbon was added. Under a nitrogen atmosphere, it was heated to 70 °C and stirred. After 4 h of reaction, it was repeatedly washed with absolute ethanol and dried at 75 °C 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 ball-milled in a planetary ball mill for 35 min and sieved to obtain a slurry with a 100-mesh sieve;

[0060] Under stirring conditions, 6 parts of sodium bicarbonate and 3 parts of a binder (composed of boric acid and polyvinyl alcohol with a mass ratio of 1:2) were added to the slurry. After stirring for 30 min, it was added to a mold and pressed into a green body, heated to 350 °C at a heating rate of 5 °C, held for 2 h, then heated to 1150 °C at a heating rate of 10 °C and held for 35 min to obtain a foam ceramic-based biofilm carrier after forming.

[0061] Example 3:

[0062] A preparation method of a foam ceramic-based biofilm carrier, comprising the following steps:

[0063] With a liquid ratio of 1:10, lithium-based bentonite was added to a sodium hydroxide solution with a mass percentage concentration of 5% and soaked for 3 h, ultrasonically treated for 10 min, and then 11% of the mass of the lithium-based bentonite of N,N'-methylenebisacrylamide was added and stirred for 40 min to obtain modified lithium-based bentonite;

[0064] The activated carbon was heat-treated at 350 °C for 30 min. After cooling, high-energy radiation with a radiation dose of 10 kGy and a time of 12 s was applied, and then it was added to absolute ethanol and ultrasonically dispersed for 10 min. Then, a silane coupling agent with an addition amount of 10% of the mass of the activated carbon was added. Under a nitrogen atmosphere, it was heated to 65 °C and stirred. After 5 h of reaction, it was repeatedly washed with absolute ethanol and dried at 75 °C 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 ball-milled in a planetary ball mill for 45 min and sieved to obtain a slurry with a 100-mesh sieve;

[0066] Under stirring conditions, 7 parts of sodium bicarbonate and 4 parts of binder (composed of boric acid and polyvinyl alcohol with a mass ratio of 2:2) were added to the slurry. After stirring for 25 min, it was added to a mold and pressed into a green body, heated to 350 °C at a heating rate of 5 °C, held for 2 h, then heated to 1200 °C at a heating rate of 12 °C and held for 30 min. After forming, a foam ceramic-based biofilm carrier was obtained.

[0067] Comparative Example 1:

[0068] Compared with Example 3, in the preparation method of the modified lithium-based bentonite in Comparative Example 1, N,N'-methylenebisacrylamide was not added, and the others were the same as in Example 3.

[0069] Comparative Example 2:

[0070] Compared with Example 3, in Comparative Example 2, the modified lithium-based bentonite was not added, and the others were the same as in Example 3.

[0071] Comparative Example 3:

[0072] Compared with Example 3, in the preparation method of the modified activated carbon in Comparative Example 3, heat treatment was not carried out, and the others were the same as in Example 3.

[0073] Comparative Example 4:

[0074] Compared with Example 3, in the preparation method of the modified activated carbon in Comparative Example 4, high-energy radiation was not carried out, and the others were the same as in Example 3.

[0075] Comparative Example 5:

[0076] Compared with Example 3, in the preparation method of the modified activated carbon in Comparative Example 5, the silane coupling agent was not added, and the others were the same as in Example 3.

[0077] Comparative Example 6:

[0078] Compared with Example 3, in Comparative Example 6, the modified activated carbon was not added, and the others were the same as in Example 3.

[0079] Comparative Example 7:

[0080] Compared with Example 3, in Comparative Example 7, the (potassium feldspar) reinforcing filler was not added, and the others were the same as in Example 3.

[0081] Comparative Example 8:

[0082] Compared with Example 3, in Comparative Example 8, the binder added was polyvinyl alcohol, and the others were the same as in Example 3.

[0083] The foam ceramic-based biofilm carrier samples prepared in Examples 1 to 3 and the comparative samples of foam ceramic-based biofilm carriers prepared in Comparative Examples 1 to 8 were subjected to performance tests, and the results are as described in Table 1 below.

[0084] Table 1: Performance test results

[0085]

[0086]

[0087] From the data analysis in Table 1, it can be seen that through optimizing the components and their ratios, the present invention can obtain a foam ceramic-based biofilm carrier with mechanical properties and porosity meeting the requirements. Compared with Example 3, in Comparative Example 1, N,N'-methylenebisacrylamide was not added in the preparation method of the modified lithium-based bentonite, resulting in a decrease in porosity and a weakening of the crosslinking of the system, which also affected the strength of the structure; in Comparative Example 2, the modified lithium-based bentonite was not added, weakening the supporting effect, but the foam ceramic-based biofilm carrier was denser, with an increase in compressive strength, but the porosity was too low, which would affect the film hanging effect; in Comparative Examples 3 to 5, different preparation methods of the modified activated carbon were used, indicating that heat treatment, high-energy radiation, and the addition of silane coupling agents would all affect the surface active sites of the activated carbon, affecting the foaming effect and resulting in changes in the compressive properties of the material; in Comparative Example 6, the modified activated carbon was not added, and the porosity decreased significantly, indicating that the modified activated carbon was helpful for increasing the porosity; in Comparative Example 7, the (potassium feldspar) reinforcing filler was not added, resulting in a significant decrease in the compressive strength of the system, indicating that appropriately adding a reinforcing filler was helpful for increasing the service strength while ensuring its porosity; in Comparative Example 8, the binder added was polyvinyl alcohol, and the degree of crosslinking decreased, resulting in a significant decrease in the application strength. In summary, there are interactions among the components of the present invention, and the prepared foam ceramic-based biofilm carrier can be applied to the field of biofilm method wastewater treatment technology.

[0088] The foam ceramic-based biofilm carrier samples prepared in Examples 1 to 3 and the comparative samples of foam ceramic-based biofilm carriers prepared in Comparative Examples 1 to 8 were respectively applied to biofilm method wastewater treatment and placed in sewage under the same conditions. Intermittent aeration was used to cultivate the sludge, and the aerobic and anaerobic times were controlled to be approximately 3:1; the film hanging situation of each group was observed regularly every day, and the effluent COD, TP, and chromaticity were monitored. When the effluent indexes were stable every day, it was regarded that the film hanging on the filler reached a stable state. The effluent standard referred to GB5084-2005, and the application performance test results are shown in Table 2.

[0089] Table 2: Application performance test results

[0090]

[0091] From the data analysis in Table 2, it can be seen that through the composition and its optimization, the film-forming time of the present invention is significantly improved, and the removal rates of COD, TP, and ammonia nitrogen in sewage are also significantly increased, showing broad application prospects.

[0092] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0093] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to 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 to 40 parts of ceramic powder, 35 to 40 parts of modified lithium-based bentonite, 9 to 12 parts of modified activated carbon, 0 to 10 parts of reinforcing filler, 3 to 7 parts of pore former, 1 to 5 parts of binder, 0 to 3 parts of stabilizer, and 1 to 3 parts of dispersant; Among them, the preparation method of the modified lithium-based bentonite is as follows: adding lithium-based bentonite into sodium hydroxide solution, soaking for 1 h to 3 h, performing ultrasonic treatment for 5 min to 10 min, then adding N,N'-methylenebisacrylamide, and stirring for 30 min to 45 min to obtain the modified lithium-based bentonite; The preparation method of the modified activated carbon is as follows: performing heat treatment on the activated carbon, cooling, then using high-energy radiation, then adding it into absolute ethanol, performing ultrasonic dispersion, then adding a silane coupling agent, heating to 55 °C to 80 °C under a nitrogen atmosphere, stirring, and after the reaction ends, washing repeatedly with absolute ethanol and drying to obtain the modified activated carbon.

2. The foam ceramic-based biofilm carrier according to claim 1, wherein The reinforcing filler is at least one of albite, orthoclase, halloysite, and short chamosite polycrystalline fiber.

3. The foam ceramic-based biofilm carrier according to claim 1, wherein, The pore former 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, wherein The binder is composed of boric acid and polyvinyl alcohol with a mass ratio of (1 to 5):(1 to 2).

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

6. The foam ceramic-based biofilm carrier according to claim 1, wherein The dispersant is at least one of sodium hexametaphosphate, sodium dodecyl sulfate, and cetyltrimethylammonium bromide.

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

8. The foam ceramic-based biofilm carrier according to claim 1, wherein The addition amount of N,N'-methylenebisacrylamide accounts for 8% to 15% of the mass of the lithium-based bentonite.

9. A preparation method of a foam ceramic-based biofilm carrier, characterized in that, The preparation method is used to prepare the foam ceramic-based biofilm carrier according to any one of claims 1 to 8, and the preparation method comprises the following steps: Mixing the ceramic powder, modified lithium-based bentonite, modified activated carbon, reinforcing filler, stabilizer, and dispersant, then wet ball milling in a planetary ball mill for 30 min to 60 min, and sieving to obtain a slurry with a mesh size of 80 to 100; Under stirring conditions, adding the pore former and the binder to the slurry, stirring for 20 min to 30 min, then adding it to a mold, pressing into a green body, heating at a heating rate of 2 °C to 5 °C to 300 °C to 500 °C, holding for 1 h to 2 h, then heating at a heating rate of 10 °C to 15 °C to 1000 °C to 1220 °C, and holding for 30 min to 45 min. After forming, the foam ceramic-based biofilm carrier is obtained.

10. Application of a foam ceramic-based biofilm carrier, characterized in that, The application is the application of the foam ceramic-based biofilm carrier according to claims 1 to 8 in the technical field of biofilm method wastewater treatment.

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