Filter material preparation method based on sewage treatment waste and ceramic filter material

Abstract

The invention discloses a filter material preparation method based on sewage treatment waste and a ceramic filter material. The preparation method comprises the following steps: carrying out wet oxidation treatment and solid-liquid-gas separation treatment on sludge generated by a sewage treatment plant to obtain a first solid raw material; drying the gravel separated from the sewage treatment plant to obtain a second solid raw material; mixing and grinding the first solid raw material and the second solid raw material to obtain mixed powder; processing the mixed powder into a forming material; and calcining the formed material, and cooling to obtain the ceramic filter material. According to the method, solid waste of a sewage treatment plant is fully utilized, the solid waste transportation amount of the sewage treatment plant is reduced, the waste treatment cost is reduced, meanwhile, the prepared ceramic filter material is long in service life, high in use strength, high in porosity and good in adsorption performance, can be used as a filter material of a sewage treatment filtering process, and is beneficial to improving the sewage treatment effect; the utilization rate of solid waste resources is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a filter material preparation method based on sewage treatment waste and a ceramic filter material. Background Art

[0002] Solid waste from urban sewage treatment plants, such as sludge, is solid waste generated in the water treatment process. With the development of sewage treatment plant construction in my country, sewage treatment capacity has increased rapidly, and the corresponding amount of solid waste has also increased rapidly. How to effectively utilize and resource it has become a hot topic in the industry.

[0003] Urban sewage treatment plants have water treatment facilities and sludge treatment facilities, which are usually divided into water lines and mud lines. The solid waste generated during the sewage treatment process mainly includes screen residue, grit tank residue, and dewatered sludge. Large pieces of garbage impurities intercepted by the screen and sand in the grit tank are usually collected and processed by the sanitation company. The remaining sludge is concentrated and dehydrated and then transported for disposal. The cost of waste disposal is relatively high. Summary of the invention

[0004] In view of this, the present application provides a filter material preparation method based on sewage treatment waste and a ceramic filter material. By using the solid waste generated in the sewage treatment process as the main raw material, a ceramic filter material with a large specific surface area is prepared, which not only improves the utilization rate of sewage treatment waste and reduces the waste disposal cost, but also reduces the cost of filter material raw materials, alleviating the problem of limited filter material raw materials.

[0005] According to one aspect of the present application, a method for preparing filter material based on sewage treatment waste is provided, comprising:

[0006] Performing wet oxidation treatment and solid-liquid-gas separation treatment on sludge generated by a sewage treatment plant to obtain a first solid raw material;

[0007] Drying the sand and gravel separated from the sewage treatment plant to obtain a second solid raw material;

[0008] Mixing and grinding the first solid raw material and the second solid raw material to obtain a mixed powder;

[0009] Processing the mixed powder into a molding material;

[0010] The molding material is calcined and cooled to obtain a ceramic filter material.

[0011] Optionally, the method for preparing filter material based on sewage treatment waste further comprises:

[0012] The first solid raw material or the second solid raw material is screened out by a screening device to remove solids with a diameter greater than 80 mesh.

[0013] Optionally, the method for preparing filter material based on sewage treatment waste further comprises:

[0014] The mixed powder is screened out by a screening device to remove solids with a diameter greater than 100 to 200 meshes.

[0015] Optionally, the mass ratio of the first solid raw material to the second solid raw material in the mixed powder is 3-7:7-3.

[0016] Optionally, the first solid raw material includes: silicon dioxide, aluminum oxide, calcium and its oxide, magnesium and its oxide, iron and its oxide, and organic matter;

[0017] The second solid raw material includes sand, gravel, silt and organic matter;

[0018] The moisture content of the first solid raw material and the second solid raw material is lower than 40%.

[0019] Optionally, the density of the sandstone is 2.5 kg / m 3 ~3kg / m 3 ; The moisture content of the sludge is less than 80%;

[0020] Optionally, the temperature of the drying treatment is 60°C to 120°C, and the time is 1h to 4h; the temperature of the calcination treatment is 800°C to 1000°C, and the time is 1h to 2h.

[0021] Optionally, the molding material includes spherical pellets, columnar pellets and / or irregular pellets.

[0022] Optionally, processing the mixed powder into a molding material comprises:

[0023] The mixed powder and water are mixed and then stirred and granulated to obtain the spherical granules and / or irregular granules; or,

[0024] The mixed powder is placed in a molding machine for extrusion molding to obtain the molding material.

[0025] Optionally, the wet oxidation treatment of sludge generated by the sewage treatment plant comprises:

[0026] Placing the sludge in an oxidation reactor and introducing oxygen or air into the oxidation reactor, wherein the amount of oxygen introduced is 50% to 70% of the COD value of the sludge in the oxidation reactor;

[0027] The oxidation reactor is heated to 220° C. to 260° C., the reaction pressure is 2.2 mPa to 4 mPa, and the temperature is kept for 0.5 h to 1.5 h, so that the sludge undergoes a wet oxidation reaction in the oxidation reactor.

[0028] According to another aspect of the present application, a ceramic filter material is provided. The ceramic filter material is prepared by the filter material preparation method based on sewage treatment waste described in the above embodiment.

[0029] Optionally, the size of the ceramic filter material is 0.5 mm to 5 mm;

[0030] The specific surface area of ​​the ceramic filter material is 30000cm 2 / g~50000cm 2 / g;

[0031] The porosity of the ceramic filter material is 40% to 60%;

[0032] The ceramic filter material has a mud content of 0.5% to 1%;

[0033] The hydrochloric acid solubility of the ceramic filter material is 1% to 2%;

[0034] The cylinder pressure strength of the ceramic filter material is 9Mpa to 15Mpa;

[0035] The sum of the crushing rate and the wear rate of the ceramic filter material is 3% to 6%.

[0036] Through the above technical solution, the sand and residual sludge separated from the grit chamber of the sewage treatment plant are used as the main raw materials, and ceramic filter materials are made under certain process conditions, which can be used as filter media in scenarios such as aerated biological filters and sand filters. In this way, the solid waste of the sewage treatment plant is fully utilized, the amount of solid waste transported out of the sewage treatment plant is reduced, and the cost of waste disposal is reduced. At the same time, the prepared ceramic filter material has a high service life and usage strength, high porosity, and good adsorption performance. It can be used as a filter material for sewage treatment filtration processes, which is beneficial to improving the sewage treatment effect and improving the utilization rate of solid waste resources.

[0037] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 A schematic flow chart of a method for preparing filter material based on sewage treatment waste provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0040] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0041] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0042] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, or there may be intermediate elements. In addition, the "connection" or "connection" used herein may include wireless connection or wireless fusion. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0043] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0044] In this embodiment, a method for preparing filter material based on sewage treatment waste is provided, such as Figure 1 As shown, the method includes:

[0045] Step 101, performing wet oxidation treatment and solid-liquid-gas separation treatment on the sludge generated by the sewage treatment plant to obtain a first solid raw material.

[0046] The first solid raw material includes silicon dioxide, aluminum oxide, calcium and its oxide, magnesium and its oxide, iron and its oxide, and organic matter. Specifically, the silicon dioxide in the first solid raw material is about 25%, and the aluminum oxide is about 16%. The water content of the sludge produced by the sewage treatment plant is generally less than 80%, and the water content of the first solid raw material after wet oxidation treatment and solid-liquid-gas separation treatment is less than 40%.

[0047] In this embodiment, through wet oxidation treatment, the organic matter in the sludge is oxidized and decomposed under high temperature and high pressure conditions, and converted into carbon dioxide, water and other harmless substances, thereby reducing the volume of the sludge and the content of organic pollutants, and the organic matter content of the sludge after treatment is low, which is convenient for subsequent treatment. Then, the solid residue in the sludge after wet oxidation is separated by solid-liquid-gas separation equipment as the first solid raw material, reducing the water content of the first solid raw material, improving the strength of the first solid raw material, and helping to prevent the pores of the finished filter material from being occupied by water, which helps to improve the filtration efficiency of the filter material.

[0048] In one embodiment, the sludge generated by the sewage treatment plant is subjected to wet oxidation treatment, specifically comprising the following steps: placing the sludge in an oxidation reactor and introducing oxygen or air into the oxidation reactor; heating the oxidation reactor to 220°C to 260°C, with a reaction pressure of 2.2mPa to 4mPa, and keeping the temperature for 0.5h to 1.5h, so that the sludge undergoes a wet oxidation reaction in the oxidation reactor. The amount of oxygen introduced is 50% to 70% of the COD value of the sludge in the oxidation reactor.

[0049] In this embodiment, under the action of high-temperature heating, the sludge can be placed in a high-temperature and high-pressure environment, and the sludge can fully react with hot oxygen (or oxygen in the air) to allow the organic matter in the sludge to be oxidized and decomposed, thereby reducing the organic matter content in the sludge. In addition, the introduction of oxygen at 50% to 70% of the COD (Chemical Oxygen Demand) value can ensure sufficient reaction, help improve the conversion rate and effect of the reaction, and increase the stability of the obtained solid raw material.

[0050] Step 102, drying the sand and gravel separated from the sewage treatment plant to obtain a second solid raw material.

[0051] Among them, the density of sand and gravel separated from the sewage treatment plant is generally 2.5kg / m 3 ~3kg / m 3 The second solid raw material includes sand, gravel, silt and organic matter. The moisture content of the second solid raw material after drying is less than 40%.

[0052] In this embodiment, a drying device is used to dry the sand and gravel separated from the sewage treatment plant, so that the water attached to the sand and gravel can evaporate quickly, which not only reduces the water content of the sand and gravel, but also increases the drying speed.

[0053] Specifically, the drying temperature is 60°C to 120°C and the drying time is 1h to 4h. Using a lower temperature for drying can better dry the temperature-sensitive sand and gravel to ensure its stability, and at the same time can reduce the drying cost while increasing the drying speed.

[0054] Step 103: Mix and grind the first solid raw material and the second solid raw material to obtain a mixed powder.

[0055] Among them, the mixing ratio of the first solid raw material and the second solid raw material can be adjusted according to the application scenario of the filter material. The more the first solid raw material, the higher the removal rate of the filter material for removing specific pollutants, the higher the probability of multilayer structure, which is conducive to improving porosity; the more the second solid raw material, the greater the strength of the filter material. For example, the mass ratio of the first solid raw material and the second solid raw material in the mixed powder is 3-7:7-3, and the specific mass ratio of the first solid raw material and the second solid raw material can be 3:7, 5:5, 6:4, etc.

[0056] In this embodiment, after the first solid raw material and the second solid raw material are mixed in a certain proportion, they are ground to grind the mixture of the first solid raw material and the second solid raw material into fine particles, which not only increases the distribution uniformity of the first solid raw material and the second solid raw material, but also makes the fine particles easier to process and shape later.

[0057] In one embodiment, before step 103, the method for preparing filter material based on sewage treatment waste further includes: screening the first solid raw material or the second solid raw material through a screening device to remove solids with a diameter greater than 80 mesh.

[0058] In this embodiment, the first solid raw material or the second solid raw material is placed in a screening device for filtration to screen out solids with a diameter greater than 80 meshes. This makes the size of the solid raw materials smaller and the particle size distribution uniform, improves the uniformity of the solid raw material mixing, makes the subsequent grinding process smoother, improves the processing efficiency of the subsequent grinding into powder, and reduces the pulverization cost.

[0059] Step 104, processing the mixed powder into a molding material.

[0060] The molding material includes spherical granules, columnar granules and / or irregular granules. The spherical granules can be round balls or elliptical balls.

[0061] In this embodiment, the mixed powder can be processed into a molding material of a specific shape through a molding process, which can improve the compressive strength and wear resistance of the final product, and the molding material has a uniform size, which is convenient for subsequent calcination control, further improving efficiency, saving time and energy, and reducing preparation costs. In addition, molding materials of different shapes can adapt to specific application requirements.

[0062] In one embodiment, before step 104, the method for preparing filter material based on sewage treatment waste further includes: screening the mixed powder with a screening device to remove solids with a diameter greater than 100 mesh to 200 mesh.

[0063] In this embodiment, the mixed powder is placed in a screening device for filtration to remove solids with a diameter greater than 100-200 meshes, thereby making the size of the mixed powder smaller and the particle size distribution uniform, which is convenient for processing and molding.

[0064] In actual application scenarios, step 104 can be implemented in the following manner:

[0065] Method 1: For spherical granules and / or irregular granules, the mixed powder and water may be mixed and then stirred and granulated to obtain spherical granules and / or irregular granules.

[0066] In this embodiment, water is added to the mixed powder as a binder, and the mixed powder is agglomerated together by the bridging or bonding effect of the binder to prepare particles. The particles made by the wet method have a moist surface, good fluidity and a low content of fine powder, which is convenient to achieve at a low cost.

[0067] Method 2: placing the mixed powder in a molding machine for extrusion molding to obtain a molding material.

[0068] In this embodiment, extrusion molding can quickly and tightly combine the powders, thereby increasing the density and mechanical strength of the molding material, enhancing the durability of the molding material, and can produce molding materials with consistent shapes and sizes, ensuring the consistency of quality and performance of each batch of products, which is beneficial to subsequent processing and application.

[0069] Step 105, calcining the molding material, and obtaining a ceramic filter material after cooling.

[0070] Specifically, the calcination temperature is 800°C to 1000°C, and the time is 1h to 2h, for example, 950°C for 1h or 850°C for 1.5h. Thus, high-temperature calcination can change the crystal structure of the molding material to form a more stable phase and crystal structure, which helps to improve the filtering performance and stability of the ceramic filter material and greatly enhance its tolerance to acids, alkalis and other chemicals. It can also promote the mutual combination of particles inside the ceramic filter material to form a denser structure, thereby improving the mechanical strength and wear resistance of the ceramic filter material and extending its service life. At the same time, high temperature will remove moisture and residual organic matter in the molding material, ensure the drying of the filter material, and help adjust the porosity and pore size distribution of the ceramic filter material, so that it has a more superior filtering effect.

[0071] The filter material preparation method based on sewage treatment waste provided in this application uses sand and residual sludge separated from the grit tank of the sewage treatment plant as the main raw materials, and is made into ceramic filter material under certain process conditions, which can be used as a filter medium in scenarios such as aerated biological filter and sand filter. In this way, the solid waste of the sewage treatment plant is fully utilized, the amount of solid waste transported out of the sewage treatment plant is reduced, and the waste disposal cost is reduced. At the same time, the prepared ceramic filter material has a high service life and usage strength, high porosity, and good adsorption performance, which is conducive to sewage treatment and improves the utilization rate of solid waste resources.

[0072] Furthermore, the size of the ceramic filter material obtained by the above embodiment is 0.5mm-5mm, for example, the particle size of the spherical ceramic filter material is 1mm, and the height of the columnar ceramic filter material is 3mm and the bottom diameter is 2mm. The larger the size, the larger the size of the material that can be filtered, and vice versa.

[0073] The specific surface area of ​​the ceramic filter material obtained by the above embodiment is 30000cm 2 / g~50000cm 2 / g, the larger the specific surface area, the stronger the adsorption capacity and filtration effect on filterable substances.

[0074] The porosity of the ceramic filter material obtained by the above embodiment, that is, the ratio of the volume occupied by the pores to the total volume, is 40% to 60%. The greater the porosity, the greater the penetration depth of the filterable material and the greater the interception capacity of the filter layer.

[0075] The mud content of the ceramic filter material prepared by the above embodiment is 0.5% to 1%. The lower the mud content, the higher the water flow rate and the better the pore adsorption effect.

[0076] The hydrochloric acid solubility of the ceramic filter material prepared by the above embodiment is 1% to 2%. The lower the hydrochloric acid solubility, the better the stability of the filter material in an acidic environment.

[0077] The cylinder pressure strength of the ceramic filter material prepared by the above embodiment is 9Mpa-15Mpa. The higher the cylinder pressure strength, the stronger the pressure resistance.

[0078] The sum of the broken material and the wear rate of the ceramic filter material prepared by the above embodiment is 3% to 6%. The lower the sum of the broken material and the wear rate, the longer the service life of the ceramic filter material. Specific embodiment 1:

[0080] The residual sludge A of the sewage treatment plant is sludge with a moisture content of 80% after dehydration. The dehydrated sludge is treated by wet oxidation method, and after solid-liquid-gas separation, the solid residue is obtained as raw material A1. Raw material A1 is basically powdery, with a moisture content of about 35%, and the main solid components are inorganic substances, including 25% silicon dioxide, 16% aluminum oxide, and some calcium, magnesium, iron and other metal oxides, and a small amount of organic matter.

[0081] The relatively clean sand separated from the sand settling tank of the sewage treatment plant after being separated by the sand-water separator is used as raw material B, with a density of about 2.65kg / m 3 , mainly including sand, gravel, silt and a small amount of attached organic matter, etc. B is dried at 105℃ for 2h to reduce its moisture content to below 40%, and then sieved through a 60-mesh sieve to obtain the undersize B1.

[0082] A1 and B1 were uniformly mixed in a mass ratio of 6:4, ground to 100 mesh, and then a small amount of water was added to stir and granulate to obtain rough embryo C.

[0083] The rough blank C was calcined at 900°C for 1.5 hours and finally cooled to obtain the ceramic filter material D. Specific embodiment 2:

[0085] The residual sludge A of the sewage treatment plant is sludge with a moisture content of 80% after dehydration. The dehydrated sludge is treated by wet oxidation method, and after solid-liquid-gas separation, the solid residue is obtained as raw material A1. Raw material A1 is basically powdery, with a moisture content of about 35%, and the main solid components are inorganic substances, including 25% silicon dioxide, 16% aluminum oxide, and some calcium, magnesium, iron and other metal oxides, and a small amount of organic matter.

[0086] The relatively clean sand separated from the sand settling tank of the sewage treatment plant after being separated by the sand-water separator is used as raw material B, with a density of about 2.7kg / m 3 , mainly including sand, gravel, silt and a small amount of attached organic matter, etc. B was dried at 105°C for 3 hours to reduce its moisture content to below 40%, and then sieved through a 60-mesh sieve to obtain the undersize B1.

[0087] A1 and B1 were uniformly mixed in a mass ratio of 3:7, ground to 200 mesh, and then a small amount of water was added to stir and granulate to obtain rough embryo C.

[0088] The rough blank C was calcined at 1000°C for 1 hour and finally cooled to obtain ceramic filter material D. Specific embodiment 3:

[0090] The residual sludge A of the sewage treatment plant is sludge with a moisture content of 80% after dehydration. The dehydrated sludge is treated by wet oxidation method, and after solid-liquid-gas separation, the solid residue is obtained as raw material A1. Raw material A1 is basically powdery, with a moisture content of about 40%, and the main solid components are inorganic substances, including 25% silicon dioxide, 16% aluminum oxide, and some calcium, magnesium, iron and other metal oxides, and a small amount of organic matter.

[0091] The relatively clean sand separated from the sand settling tank of the sewage treatment plant after being separated by the sand-water separator is used as raw material B, with a density of about 3kg / m 3 , mainly including sand, gravel, silt and a small amount of attached organic matter, etc. B is dried at 90℃ for 2h to reduce its moisture content to below 40%, and then sieved through a 60-mesh sieve to obtain the undersize B1.

[0092] A1 and B1 were uniformly mixed in a mass ratio of 7:3, and ground to 160 mesh. The mixed powder was placed in a molding machine for extrusion molding, and granulated by a granulator to obtain a rough embryo C.

[0093] The rough blank C was calcined at 800°C for 2 hours and finally cooled to obtain ceramic filter material D.

[0094] The main indicators of the ceramic filter material D obtained in the above specific embodiment are shown in Table 1.

[0095] index unit Specific embodiment 1 Specific embodiment 2 Specific embodiment 3 Particle size range mm 1～2 2～3 1～2 Cylinder pressure strength Mpa 10 11.5 9 The sum of crushed material and wear rate ％ 5 4 5 Mud content ％ 1 0.8 1 Hydrochloric acid solubility ％ 1.5 1 1 Porosity ％ 50 45 55 Specific surface area <![CDATA[cm 2 / g]]> 40000 32000 45000 Dissolution No detection No detection No detection

[0096] As shown in Table 1, compared with traditional quartz sand filter media, the ceramic filter media prepared by the above method has the characteristics of large specific surface area, small head loss and strong pollution interception ability. It has a long service life and usage intensity, high porosity and good adsorption performance. It can be used as a filtration and adsorption medium, which is beneficial to human sewage treatment.

[0097] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0098] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A method for preparing filter material based on sewage treatment waste, characterized in that: The method comprises: Performing wet oxidation treatment and solid-liquid-gas separation treatment on sludge generated by a sewage treatment plant to obtain a first solid raw material; Drying the sand and gravel separated from the sewage treatment plant to obtain a second solid raw material; Mixing and grinding the first solid raw material and the second solid raw material to obtain a mixed powder; Processing the mixed powder into a molding material; The molding material is calcined and cooled to obtain a ceramic filter material.

2. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The method further comprises: The first solid raw material or the second solid raw material is screened by a screening device to remove solids with a diameter greater than 80 mesh; or, The mixed powder is screened out by a screening device to remove solids with a diameter greater than 100 to 200 meshes.

3. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The mass ratio of the first solid raw material to the second solid raw material in the mixed powder is 3-7:7-3.

4. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The first solid raw material includes: silicon dioxide, aluminum oxide, calcium and its oxide, magnesium and its oxide, iron and its oxide, and organic matter; The second solid raw material includes sand, gravel, silt and organic matter; The moisture content of the first solid raw material and the second solid raw material is lower than 40%.

5. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The density of the sandstone is 2.5 kg / m 3 ~3kg / m 3 ; The moisture content of the sludge is less than 80%; The drying temperature is 60℃~120℃, and the time is 1h~4h; The calcination temperature is 800°C to 1000°C, and the calcination time is 1h to 2h.

6. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The molding material includes spherical particles, columnar particles and / or irregular particles.

7. The method for preparing filter material based on sewage treatment waste according to claim 6, characterized in that: The step of processing the mixed powder into a molding material comprises: The mixed powder and water are mixed and then stirred and granulated to obtain the spherical granules and / or irregular granules; or, The mixed powder is placed in a molding machine for extrusion molding to obtain the molding material.

8. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The wet oxidation treatment of the sludge generated by the sewage treatment plant comprises: Placing the sludge in an oxidation reactor and introducing oxygen or air into the oxidation reactor, wherein the amount of oxygen introduced is 50% to 70% of the COD value of the sludge in the oxidation reactor; The oxidation reactor is heated to 220° C. to 260° C., the reaction pressure is 2.2 mPa to 4 mPa, and the temperature is kept for 0.5 h to 1.5 h, so that the sludge undergoes a wet oxidation reaction in the oxidation reactor.

9. The method for preparing filter material based on sewage treatment waste according to claim 1, characterized in that: The size of the ceramic filter material is 0.5 mm to 5 mm; The specific surface area of ​​the ceramic filter material is 30000cm 2 / g~50000cm 2 / g; The porosity of the ceramic filter material is 40% to 60%; The ceramic filter material has a mud content of 0.5% to 1%; The hydrochloric acid solubility of the ceramic filter material is 1% to 2%; The cylinder pressure strength of the ceramic filter material is 9Mpa to 15Mpa; The sum of the crushing rate and the wear rate of the ceramic filter material is 3% to 6%.

10. A ceramic filter material, characterized in that: The ceramic filter material is prepared by the filter material preparation method based on sewage treatment waste according to any one of claims 1 to 9.

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