Core-shell type sewage treatment filter material

Abstract

The utility model discloses a core-shell type sewage treatment filter material, which comprises an inner core ball core body and an outer shell layer, the inner core ball core body is arranged inside the outer shell layer, the outer shell layer comprises a first outer shell layer and a second outer shell layer, the outer side of the inner core ball core body is coated with the first outer shell layer, and the second outer shell layer is of a rod-shaped structure arranged in an array. According to the utility model, a filter material structure with a firm inner core and a hydrophilic outer layer is formed, i.e., the polyvinyl alcohol layer and the iron oxide material layer are coated on the periphery of the polystyrene ball core body, the filter material has a larger specific surface area, and the hydrophilic iron oxide and polyvinyl alcohol of the shell layer can reduce the surface affinity; the biological interception area of the filter material is further increased due to the uniformly distributed and arranged iron oxides, and the outer active material layer is not easy to fall off and has stable and long-acting hydrophilicity and biocompatibility, so that the biofilm formation speed and biofilm formation amount of the surface of the filter material are effectively increased, the removal rate of pollutants is increased, and the biological treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment filter media, and specifically belongs to a core-shell type sewage treatment filter media. Background Art

[0002] In the process of water treatment, filtration technology plays a key role, and the selection and application strategy of filter media directly affect the final treatment effect. At present, researchers are focusing on developing innovative new filter materials to improve the water treatment efficiency.

[0003] As a carrier of biofilm in a filter tank, polystyrene plays a treatment role through biofilm during filtration. Although polystyrene can provide a rich attachment space for biofilm due to its large specific surface area, its natural hydrophobicity and low biocompatibility limit the rapid attachment, growth, and reproduction processes of microorganisms, resulting in a long system startup period, and in the stable operation stage, the biofilm structure on the surface of the filter media may not be tight enough.

[0004] To sum up, aiming at the disadvantages of traditional filter media such as high surface affinity, poor hydrophilicity, and poor biocompatibility, it is very necessary to conduct research on the structure of filter media and design a new type of sewage treatment filter media with strong durability, high hydrophilicity, good biocompatibility, and a large amount of biological film attachment. Summary of the Utility Model

[0005] In order to overcome the problems of poor biocompatibility on the surface of existing traditional organic polymers and slow biological film attachment speed, the purpose of the utility model is to provide a core-shell type sewage treatment filter media, which not only has a high mechanical strength and a low bulk density of the inner core ball core body, but also has a hydrophilic material layer on the outer shell layer that traditional polymer filter media do not have. It can not only improve the surface hydrophilicity and biological affinity of the filter media, but also increase the specific surface area of the filter media, further increasing the amount of biological film attachment on the surface of the filter media, thereby improving the sewage treatment efficiency of the filter media in the filter tank.

[0006] A core-shell type sewage treatment filter media, the filter media includes an inner core ball core body and an outer shell layer, the inner core ball core body is arranged inside the outer shell layer, the outer shell layer includes a first outer shell layer and a second outer shell layer, the first outer shell layer covers the outside of the inner core ball core body, and the second outer shell layer is in a rod-shaped structure arranged in an array, and this second outer shell layer is vertically arranged in an array tangent to the inner core ball core body covered by the first outer shell layer.

[0007] Preferably, it further includes an intermediate layer, the intermediate layer is arranged between the inner core ball core body and the outer shell layer, and the intermediate layer is a grid structure woven by polystyrene fiber bundles and polytetrafluoroethylene fiber bundles.

[0008] Preferably, the inner core ball core body is made of polystyrene.

[0009] Preferably, the material of the first outer shell layer is polyvinyl alcohol.

[0010] Preferably, the second outer shell layer is made of iron oxide.

[0011] Preferably, the iron oxide is iron oxyhydroxide or magnetite.

[0012] Preferably, the diameter of the inner core spherical body is 1 - 5 mm, and the thickness of the intermediate layer is 0.05 - 1 mm.

[0013] Preferably, the thickness of the first outer shell layer is 0.5 - 2 mm, and the thickness of the second outer shell layer is 0.05 - 0.5 mm.

[0014] The utility model has the following technical effects:

[0015] (1) For the core - shell type sewage treatment filter material of the utility model, by setting the first outer shell layer and the second outer shell layer, a structure with a firm inner core and a hydrophilic outer layer is formed, that is, a polyvinyl alcohol layer and an iron oxide material layer are coated on the periphery of the polystyrene spherical core. The filter material has a large specific surface area. The hydrophilic iron oxide and polyvinyl alcohol in the shell layer can reduce the surface affinity energy. The uniformly distributed iron oxide further increases the biological interception area of the filter material, and the outer active material layer is not easy to fall off, having stable and long - lasting hydrophilicity and biocompatibility; by using a grid structure woven from polystyrene fiber bundles and polytetrafluoroethylene fiber bundles as the intermediate layer, the corrosion resistance and stability of the filter material can be effectively improved.

[0016] (2) When the filter material of the utility model is added to a biological filter for use, it has a higher biological interception ability than the traditional single - core spherical filter material, effectively improving the film - hanging speed and film - hanging amount on the surface of the filter material, thereby improving the removal rate of pollutants and reducing the biological treatment cost. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the core - shell type sewage treatment filter material in Embodiment 1 of the utility model;

[0018] Figure 2 is a schematic structural diagram of the core - shell type sewage treatment filter material in Embodiment 2 of the utility model.

[0019] In the drawings, 1 - inner core spherical body, 2 - first outer shell layer, 3 - second outer shell layer, 4 - intermediate layer Detailed Embodiments

[0020] To make the objectives, technical solutions and advantages of the present utility model more clearly understood, the following preferred embodiments are given with reference to the accompanying drawings to further elaborate on the present utility model. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present utility model, and these aspects of the present utility model can be implemented even without these specific details.

[0021] Embodiment 1

[0022] As Figure 1 shown, a core-shell type sewage treatment filter material is provided. The filter material body is spherical with a diameter of 2 - 8 mm. The filter material includes an inner core sphere 1 and an outer shell layer. The inner core sphere 1 is disposed inside the outer shell layer, and the inner core sphere 1 is located at the innermost layer of the core-shell type filter material. Its structure is a spherical structure with a diameter of 1 - 5 mm. The inner core sphere 1 is made of polystyrene with a low bulk density and high mechanical strength, and its function is to provide a framework support for the whole filter material and increase the mechanical strength of the entire filter material.

[0023] The outer shell layer includes a first outer shell layer 2 and a second outer shell layer 3. The first outer shell layer 2 covers the outside of the inner core sphere 1. The second outer shell layer 3 is in the form of a rod-like structure arranged in an array, and this second outer shell layer 3 is arranged perpendicular to the tangent of the inner core sphere 1 covered by the first outer shell layer 2 in an array. The first outer shell layer 2 wraps around the outer periphery of the inner core sphere 1 and is composed of polyvinyl alcohol. The thickness of the first outer shell layer 2 is 0.5 - 2 mm. The function of polyvinyl alcohol is to provide a bridge between the inner core sphere 1 and the outer active material layer. The active material can increase the crosslinking degree of polyvinyl alcohol, further improving the stability of the core-shell type filter material. At the same time, polyvinyl alcohol has hydrophilicity and there are micropores and gaps on the surface of the polyvinyl alcohol network, which can improve the hydrophilicity of the filter material and increase the specific surface area of the filter material. The second outer shell layer 3 is located at the outermost layer of the core-shell type filter material, and it is composed of iron oxide. The iron oxide can specifically be hydroxy oxide or magnetite. The shape of the iron oxide is rod-like and is arranged perpendicular to the sphere tangent in an array on the outermost layer. The thickness of the second outer shell layer 3 is 0.05 - 0.5 mm. The rod-like and surface-hydrophilic iron oxide further improves the hydrophilicity of the core-shell type filter material. The vertically arrayed structure increases the specific surface area of the filter material, can significantly enhance the biological interception ability of the filter material, and further improves the film-forming speed and film-forming amount per unit time.

[0024] The basic process of treating pollutants in the biological filter tank in this embodiment is as follows:

[0025] The filter material is added after the biological filter. With the low bulk density of the polystyrene inner core sphere 1, the filter material floats in the upper-middle part of the filter. Microorganisms in the water flow are first intercepted by the hydrophilic active substances in the outer shell layer and remain in the microporous gaps on the surface of the filter material. The first outer shell layer 2 can effectively reduce its biological affinity energy and effectively increase the amount of biofilm formation per unit time. The rod-shaped iron oxides vertically arrayed in the second outer shell layer 3 effectively increase the specific surface area of the filter material and at the same time enhance the biological interception ability of the filter material. The surface microporous gaps also provide favorable conditions for the attachment of microorganisms. As the treatment time of the system progresses, microorganisms are continuously intercepted by the filter material and reproduce on the surface of the filter material until the filter material biofilm formation process is completed. With the successful attachment of microorganisms on the surface of the filter material, the microorganisms start to decompose the pollution components in the water body, such as nitrate nitrogen, ammonia nitrogen compounds, etc.

[0026] Example 2

[0027] As Figure 2 shown, a core-shell type sewage treatment filter material, the filter material body is spherical with a diameter of 2-8 mm. The filter material includes an inner core sphere 1, an intermediate layer 4 and an outer shell layer. The inner core sphere 1 is arranged inside the outer shell layer. The inner core sphere 1 is in the innermost layer of the core-shell type filter material and its structure is a spherical structure with a diameter of 1-5 mm. The inner core sphere 1 is made of polystyrene with a low bulk density and high mechanical strength, and its function is to provide a framework support for the whole filter material and increase the mechanical strength of the whole filter material.

[0028] The intermediate layer 4 is disposed between the kernel core 1 and the outer shell layer. The intermediate layer 4 is a grid structure woven by polystyrene fiber bundles and polytetrafluoroethylene fiber bundles, and the thickness of the intermediate layer 4 is 0.05 - 1 mm. By providing the intermediate layer 4, the anti-corrosion property and stability of the filter material can be effectively improved. The outer shell layer includes a first outer shell layer 2 and a second outer shell layer 3. The first outer shell layer 2 covers the outside of the kernel core 1. The second outer shell layer 3 is a rod-shaped structure arranged in an array, and the second outer shell layer 3 is arranged perpendicular to the tangent of the kernel core 1 covered by the first outer shell layer 2 in an array. The first outer shell layer 2 wraps around the outer periphery of the kernel core 1 and is composed of polyvinyl alcohol. The thickness of the first outer shell layer 2 is 0.5 - 2 mm. The function of polyvinyl alcohol is to provide a bridge for the kernel core 1 and the outer active material layer. The active material can increase the crosslinking degree of polyvinyl alcohol, further improving the stability of the core-shell filter material. At the same time, polyvinyl alcohol has hydrophilicity and there are micropores and gaps on the surface of the polyvinyl alcohol network, which can improve the hydrophilicity of the filter material and increase the specific surface area of the filter material. The second outer shell layer 3 is located at the outermost layer of the core-shell filter material and is composed of iron oxide. The iron oxide can specifically be hydroxy oxide or magnetite. The shape of the iron oxide is rod-shaped and is arranged perpendicular to the tangent of the sphere in an array at the outermost layer. The thickness of the second outer shell layer 3 is 0.05 - 0.5 mm. The rod-shaped and surface-hydrophilic iron oxide further improves the hydrophilicity of the core-shell filter material. The vertically arrayed structure increases the specific surface area of the filter material, can significantly enhance the biological interception ability of the filter material, and further improves the film-forming speed and film-forming amount per unit time.

[0029] The basic process of treating pollutants in the biological filter in this embodiment is as follows:

[0030] After the filter material is added to the biological filter, relying on the lower bulk density of the polystyrene kernel core 1, the filter material floats in the upper-middle part of the filter pool. Microorganisms in the water flow are first intercepted by the hydrophilic active substances in the outer shell layer and remain in the micropores and gaps on the surface of the filter material. The intermediate layer 4 improves the anti-corrosion property and stability of the filter material. The first outer shell layer 2 can effectively reduce its biological affinity energy and effectively increase the film-forming amount per unit time. The rod-shaped iron oxide with a vertically arrayed distribution in the second outer shell layer 3 effectively increases the specific surface area of the filter material, and at the same time enhances the biological interception ability of the filter material. The surface micropores and gaps also provide favorable conditions for the attachment of microorganisms. As the treatment time of the system progresses, microorganisms are continuously intercepted by the filter material and reproduce on the surface of the filter material until the film-forming process of the filter material is completed. With the successful attachment of microorganisms on the surface of the filter material, the microorganisms start to decompose the polluting components in the water body, such as nitrate nitrogen, ammonia nitrogen compounds, etc.

[0031] In summary, the core-shell sewage treatment filter material provided by the present utility model assembles a hydrophilic intermediate layer and an active material layer on the surface of polystyrene with poor hydrophobicity and bioaffinity to form a core-shell sewage treatment filter material in a core-shell structure. During use, the hydrophilic active material of the outer shell layer increases the biointerception ability of the filter material, improves the film-forming amount of the filter material per unit time, enhances the practicality of the filter material, has a wide range of applicable working conditions, and can achieve efficient film formation and pollutant removal efficiency without changing the original filter tank process equipment or working conditions, thereby improving the sewage treatment efficiency.

[0032] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A core-shell type sewage treatment filter material, characterized in that: The filter medium includes a core ball core and a shell layer. The core ball core is disposed inside the shell layer. The shell layer includes a first shell layer and a second shell layer. The first shell layer covers the outside of the core ball core. The second shell layer is in the form of a rod-shaped structure arranged in an array, and the second shell layer is arranged perpendicular to the tangent of the core ball core covered by the first shell layer in an array.

2. The core-shell sewage treatment filter medium according to claim 1, characterized in that: It further includes an intermediate layer. The intermediate layer is disposed between the core ball core and the shell layer. The intermediate layer is a grid structure woven from polystyrene fiber bundles and polytetrafluoroethylene fiber bundles.

3. The core-shell sewage treatment filter material according to claim 1, wherein: The core ball core is made of polystyrene.

4. A core-shell sewage treatment filter medium according to claim 1, characterized in that: The material of the first shell layer is polyvinyl alcohol.

5. The core-shell type sewage treatment filter material according to claim 1, characterized in that: The second shell layer is made of iron oxide.

6. The core-shell sewage treatment filter medium according to claim 5, wherein: The iron oxide is iron oxyhydroxide or magnetite.

7. The core-shell sewage treatment filter medium according to claim 1, characterized in that: The diameter of the core ball core is 1-5 mm, and the thickness of the intermediate layer is 0.05-1 mm.

8. A core-shell sewage treatment filter medium according to claim 1, characterized in that: The thickness of the first shell layer is 0.5-2 mm, and the thickness of the second shell layer is 0.05-0.5 mm.

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