Magnetic biological carrier materials

Abstract

The invention relates to a magnetic biological carrier material. The carrier material is in a polyhedral configuration, which is composed of a plurality of supporting rods and a central axis. The outer surfaces of the supporting rods and the central axis are both corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the interior and exterior surfaces are both provided with pores. The carrier material is prepared from the following raw materials in mass fraction: 10.24-15.81% of polypropylene, 2.67-8.21% of ferroferric oxide, 21.202-45.96% of controlled release substances, 0.83-1.46% of nutrients, 0.57-1.94% of sodium alginate, 0.5-1.89% of silane coupling agent, 0.51-2.43% of ammonium carbonate, 0.21-0.87% of liquid paraffin, 0.35-0.74% of silicone oil, and the balance is water. The present invention can promote microorganisms to quickly form stable biofilms on the outside and inside of the material. At the same time, the design of the polyhedral configuration can increase the contact time between microorganisms and water bodies, which is beneficial to improving the degradation efficiency of pollutants. In addition, high molecular polymers are added to the carrier material to enhance the mechanical properties and acid and alkali resistance of the material.

Description

Technical Field

[0001] The invention belongs to the technical field of biological water treatment materials, and in particular relates to a magnetic biological carrier material used in the sewage treatment industry. Background Art

[0002] As the country pays more attention to environmental issues, more and more environmental problems are being discovered and improved. The most important environmental pollution problem is water pollution. As water pollution becomes more and more serious, more and more water treatment processes are being developed and applied. In these processes, there is a very important substance, that is, biological filler. Especially in the biofilm method for treating domestic wastewater, biological filler is a carrier of microorganisms. It can determine the amount of microorganisms attached in the biochemical pool in the reaction process, and affect the operation effect of the entire process by controlling the amount of microorganisms attached.

[0003] At present, the commonly used biological carrier materials in water treatment applications include zeolite, ceramsite, activated carbon, quartz sand, coke, organic glass, diatomaceous earth, various resins, plastics and fibers. These carriers can only form biofilms on the surface of the carrier, and the biomass is relatively small, the microbial environment is relatively simple, and there are disadvantages such as insufficient strength, poor wear resistance, small specific surface area, and inconvenient operation. For example, inorganic materials such as biological zeolite, biological ceramsite, and activated carbon are widely used in domestic wastewater biological treatment. These filler carriers are mostly spherical. Because their specific gravity is greater than that of water, they are easily accumulated on the supporting layer at the bottom of the pool, causing conjunctiva to block the sewage channel. During use, the waterway must be opened by backwashing, which is complicated to operate and inconvenient to manage, so it cannot be adapted to large-scale promotion and use.

[0004] Existing magnetic carrier materials mainly use activated carbon particles, diatomaceous earth, kaolin, fly ash or hydrophilic silica as matrix materials, and are prepared by cross-linking the magnetic material and the matrix material through polypropylene. Although this magnetic biological carrier can stimulate the growth of microorganisms by magnetic field effect, so as to enhance the removal effect of pollutants, the nutrient elements attached to the material are too few, which is not conducive to the initial biofilm formation of the carrier. Secondly, the carrier structure is mostly spherical. So far, there has never been a report on polyhedral magnetic biological carrier materials. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a magnetic biological carrier material with a polyhedral configuration (especially a tetrahedral configuration). The polyhedral configuration is prepared by improving the external structure of the material. The spatial polyhedron formed by the configuration can avoid the problem of small contact area between the carrier and the water body caused by material accumulation during the delivery process; nutrients and magnetic substances are added to the composite material. The addition of these two components can improve the biological activity of the water body, which is conducive to the rapid attachment of microorganisms to the inside and outside of the carrier material and the formation of a strong biofilm.

[0006] A magnetic biological carrier material, the carrier material is in a polyhedral configuration, the polyhedral configuration is composed of a plurality of support rods and a central axis, the outer surfaces of the support rods and the central axis are both corrugated, the interior of the support rods and the central axis are both honeycombed to form a tortuous space, and the inner and outer surfaces thereof are provided with pores.

[0007] Preferably, the carrier material is in a tetrahedral configuration, which is composed of four support rods and a central axis. The carrier material is formed by injection molding, and the four faces of the spatial tetrahedron formed by the four support rods and the central axis are completely identical, and the bond angles formed between the central axis and the four support rods are all 109.5°. The four faces of the spatial tetrahedron formed by this configuration are completely identical, and this configuration feature can be used to avoid the problem of small contact area between the carrier and the water body caused by material accumulation during the delivery process.

[0008] Preferably, the central axis is in the shape of a sphere, the surface of the sphere is corrugated, the interior is a tortuous space formed by a honeycomb, and the materials inside and outside the sphere have pores.

[0009] Preferably, the support rod is in a truncated cone shape, and the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface away from the central axis. The surface of the four support rods is corrugated, and the inner part is formed by a tortuous space of a honeycomb, and the inner and outer materials have pores.

[0010] Preferably, the tortuous space is formed by stacking open honeycombs arranged transversely or stacking open honeycombs arranged longitudinally.

[0011] Preferably, the tortuous space is formed by stacking and compounding open honeycombs arranged transversely and open honeycombs arranged longitudinally.

[0012] Preferably, the carrier material is prepared from the following raw materials in mass fraction: 10.24-15.81% polypropylene, 2.67-8.21% ferroferric oxide, 21.202-45.96% controlled release material, 0.83-1.46% nutrient, 0.57-1.94% sodium alginate, 0.5-1.89% silane coupling agent, 0.51-2.43% ammonium carbonate, 0.21-0.87% liquid paraffin, 0.35-0.74% silicone oil, and the balance is water. The above raw materials are modified to make uniform injection molding granules, which are then injection molded into polyhedral magnetic biological carrier materials used for water treatment.

[0013] Preferably, the controlled-release substance is a combination of modified corn cobs and diatomaceous earth or a combination of activated carbon and diatomaceous earth, wherein the mass fraction of the modified corn cobs or activated carbon is 15.442-30.62%, and the mass fraction of the diatomaceous earth is 5.76-15.34%; and the nutrient is yeast powder or starch.

[0014] Preferably, the modified corn cob is prepared by soaking and modifying a certain amount of corn cobs in sodium hydroxide solution and potassium permanganate solution, and the weight percentages of its components are: corn cob 1-10%, sodium hydroxide 3-18%, potassium permanganate 0.5-15%, and the balance is water.

[0015] Furthermore, the preparation method of the modified corn cob is as follows: a certain amount of corn cobs are put into a sodium hydroxide solution, shaken at room temperature for 24 hours, then the corn cobs are taken out and repeatedly rinsed with deionized water until the pH is close to neutral, and then the corn cobs are put into a potassium permanganate solution, shaken and oxidized at room temperature for 4 hours, then the corn cobs are taken out and repeatedly rinsed with deionized water, and then dried to obtain the modified corn cobs.

[0016] Preferably, the carrier material is prepared from the following raw materials in mass fractions: 13.35% polypropylene, 3.97% ferrosoferric oxide, 23.43% modified corn cob, 8.76% diatomaceous earth, 1.12% yeast powder, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water.

[0017] Compared with the prior art, the magnetic bio-carrier material of the present invention has the following beneficial effects:

[0018] 1. The magnetic biological carrier material of the present invention has a polyhedral configuration, which can avoid the problem of small contact area between the carrier and the water body caused by the accumulation of materials during the delivery process, thereby improving the water treatment efficiency;

[0019] 2. The polyhedral magnetic biological carrier material of the present invention is formed by injection molding, and the outer surface of the carrier material is corrugated and relatively rough, which is conducive to the attachment and growth of microorganisms on the surface of the material and the formation of biofilm;

[0020] 3. The polyhedral magnetic bio-carrier material of the present invention has a tortuous space composed of an open honeycomb inside. This design can increase the filtering space and prolong the contact time between water flow and microorganisms, thereby achieving the purpose of improving the degradation efficiency;

[0021] 4. The polyhedral magnetic biological carrier material of the present invention uses a high molecular polymer (polypropylene) to bond various materials with the carrier or matrix material, thereby enhancing the mechanical properties of the material and its resistance to acid and alkali;

[0022] 5. Nutrients are added to the polyhedral magnetic biological carrier material of the present invention. The purpose of this design is to achieve the slow release of nutrients, promote the rapid biofilm formation of microorganisms, and also initiate the degradation of difficult-to-degrade substances;

[0023] 6. Modified corn cobs, ammonium carbonate, diatomaceous earth, etc. are added to the polyhedral magnetic bio-carrier material of the present invention. These materials can form a large number of pores on the internal surface of the magnetic bio-carrier material. At the same time, the modified corn cobs and diatomaceous earth can be used as controlled release materials to control the release of primary nutrients and adsorb pollutants, so as to enhance the filler's ability to adsorb and metabolize microorganisms and organic pollutants and improve water treatment efficiency;

[0024] 7. Magnetic materials are added to the polyhedral magnetic biological carrier material of the present invention. The magnetic effect of these magnetic materials can greatly promote the attachment and movement of microorganisms; at the same time, the influence of the magnetic field causes the pollutants in the wastewater and the flocculants of the magnetic particles to move along the direction of the magnetic lines of force, which can better remove and separate the pollutants;

[0025] 8. The polyhedral magnetic bio-carrier material of the present invention is added with coupling agents, lubricants, dispersants, etc. The addition of these chemical additives greatly improves the fluidity and stability of the polyhedral magnetic bio-carrier material during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of a tetrahedral magnetic biological carrier material of the present invention;

[0027] Figure 2 This is an external top view of a tetrahedral magnetic biological carrier material of the present invention;

[0028] Figure 3 This is an internal top view of a tetrahedral magnetic biological carrier material of the present invention (open honeycomb horizontal arrangement);

[0029] Figure 4 This is an internal top view of a tetrahedral magnetic bio-carrier material of the present invention (open honeycomb longitudinal arrangement). DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0031] Example 1

[0032] Reference Figures 1 to 4 A magnetic biological carrier material, the carrier material has a tetrahedral configuration, the tetrahedral configuration is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles (such as α) formed between the central axis and the support rods are all 109.5°, the surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0033] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is composed of a composite of transversely arranged open honeycombs and longitudinally arranged open honeycombs stacked and accumulated.

[0034] The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferroferric oxide, 23.43% modified corn cob, 8.76% diatomaceous earth, 1.12% yeast powder, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water. The above raw materials are modified to prepare uniform injection molding particles, which are then injection molded into tetrahedral magnetic biological carrier materials used for water treatment.

[0035] The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution for modification, and the weight percentages of the components are: 5% corn cobs, 10.5% sodium hydroxide, 8.5% potassium permanganate, and the balance is water. The specific preparation process is: put the weighed corn cobs into the sodium hydroxide solution, shake at room temperature for 24 hours, take out the corn cobs, and repeatedly rinse with deionized water until the pH is close to neutral, then put the corn cobs into the potassium permanganate solution, shake and oxidize at room temperature for 4 hours, take out the corn cobs, and repeatedly rinse with deionized water, and then dry them to obtain the modified corn cobs.

[0036] Treatment effect of domestic sewage with carrier structure:

[0037] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1 The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 96% and a removal rate of ammonia nitrogen exceeding 87%.

[0038] Example 2

[0039] Reference Figure 1 , Figure 2 , Figure 4 A magnetic biological carrier material, the carrier material has a tetrahedral configuration, the tetrahedral configuration is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles (such as α) formed between the central axis and the four support rods are all 109.5°, the outer surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0040] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is formed by longitudinally arranging and stacking open honeycombs 3.

[0041] The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferroferric oxide, 23.43% modified corn cob, 8.76% diatomaceous earth, 1.12% yeast powder, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water. The above raw materials are modified to prepare uniform injection molding particles, which are then injection molded into tetrahedral magnetic biological carrier materials used for water treatment.

[0042] The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution for modification, and the weight percentages of the components are: 5% corn cobs, 10.5% sodium hydroxide, 8.5% potassium permanganate, and the balance is water. The specific preparation process is: put the weighed corn cobs into the sodium hydroxide solution, shake at room temperature for 24 hours, take out the corn cobs, and repeatedly rinse with deionized water until the pH is close to neutral, then put the corn cobs into the potassium permanganate solution, shake and oxidize at room temperature for 4 hours, take out the corn cobs, and repeatedly rinse with deionized water, and then dry them to obtain the modified corn cobs.

[0043] Treatment effect of domestic sewage with carrier structure:

[0044] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1 The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of 88% and a removal rate of ammonia nitrogen exceeding 81%.

[0045] Example 3

[0046] Reference Figures 1 to 3 A magnetic biological carrier material, the carrier material has a tetrahedral configuration, the tetrahedral configuration is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed by the tetrahedron are exactly the same, and the bond angles (such as α) formed between the central axis and the four support rods are all 109.5°, the outer surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the inner and outer surfaces have pores, and the carrier material is formed by injection molding.

[0047] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is formed by open honeycombs 3 arranged horizontally and stacked.

[0048] The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferroferric oxide, 23.43% modified corn cob, 8.76% diatomaceous earth, 1.12% yeast powder, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water. The above raw materials are modified to prepare uniform injection molding particles, which are then injection molded into tetrahedral magnetic biological carrier materials used for water treatment.

[0049] The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution for modification, and the weight percentages of the components are: 5% corn cobs, 10.5% sodium hydroxide, 8.5% potassium permanganate, and the balance is water. The specific preparation process is: put the weighed corn cobs into the sodium hydroxide solution, shake at room temperature for 24 hours, take out the corn cobs, and repeatedly rinse with deionized water until the pH is close to neutral, then put the corn cobs into the potassium permanganate solution, shake and oxidize at room temperature for 4 hours, take out the corn cobs, and repeatedly rinse with deionized water, and then dry them to obtain the modified corn cobs.

[0050] Treatment effect of domestic sewage with carrier structure:

[0051] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1 The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 89% and a removal rate of ammonia nitrogen exceeding 79%.

[0052] Example 4

[0053] Reference Figures 1 to 4A tetrahedral magnetic biological carrier material, the tetrahedral configuration of the carrier material is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles (such as α) formed between the central axis and the support rods are all 109.5°, the surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0054] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is composed of a composite of transversely arranged open honeycombs and longitudinally arranged open honeycombs stacked and accumulated.

[0055] The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferroferric oxide, 23.43% activated carbon, 8.76% diatomaceous earth, 1.12% starch, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water. The above components are modified and processed by injection molding to form a tetrahedral configuration.

[0056] Treatment effect of domestic sewage with carrier structure:

[0057] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1 The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 86% and a removal rate of ammonia nitrogen exceeding 75%.

[0058] Example 5

[0059] Reference Figures 1 to 4A tetrahedral magnetic biological carrier material, the tetrahedral configuration of the carrier material is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles formed between the central axis and the support rods are all 109.5°, the surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0060] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is composed of a composite of transversely arranged open honeycombs and longitudinally arranged open honeycombs stacked and accumulated.

[0061] The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferroferric oxide, 23.43% modified corn cob, 8.76% diatomaceous earth, 1.12% starch, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water. The above components are modified and processed by injection molding to form a tetrahedral configuration.

[0062] The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution for modification, and the weight percentages of the components are: 5% corn cobs, 10.5% sodium hydroxide, 8.5% potassium permanganate, and the balance is water. The specific preparation process is: put the weighed corn cobs into the sodium hydroxide solution, shake at room temperature for 24 hours, take out the corn cobs, and repeatedly rinse with deionized water until the pH is close to neutral, then put the corn cobs into the potassium permanganate solution, shake and oxidize at room temperature for 4 hours, take out the corn cobs, and repeatedly rinse with deionized water, and then dry them to obtain the modified corn cobs.

[0063] Treatment effect of domestic sewage with carrier structure:

[0064] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 92% and a removal rate of ammonia nitrogen exceeding 83%.

[0065] Example 6

[0066] Reference Figures 1 to 4 A tetrahedral magnetic biological carrier material, the tetrahedral configuration of the carrier material is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles formed between the central axis and the support rods are all 109.5°, the surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0067] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is composed of a composite of transversely arranged open honeycombs and longitudinally arranged open honeycombs stacked and accumulated.

[0068] The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferroferric oxide, 23.43% activated carbon, 8.76% diatomaceous earth, 1.12% yeast powder, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water. The above components are modified and processed by injection molding to form a tetrahedral configuration.

[0069] Treatment effect of domestic sewage with carrier structure:

[0070] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1 The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 89% and a removal rate of ammonia nitrogen exceeding 78%.

[0071] Example 7

[0072] Reference Figures 1 to 4 A tetrahedral magnetic biological carrier material, the tetrahedral configuration of the carrier material is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles formed between the central axis and the support rods are all 109.5°, the surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0073] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is composed of a composite of transversely arranged open honeycombs and longitudinally arranged open honeycombs stacked and accumulated.

[0074] The carrier material is prepared from the following raw materials in mass fraction: 10.24% polypropylene, 2.67% ferroferric oxide, 30.62% modified corn cob, 5.76% diatomaceous earth, 0.83% yeast powder, 0.57% sodium alginate, 0.5% silane coupling agent, 0.51% ammonium carbonate, 0.21% liquid paraffin, 0.35% silicone oil, and the balance is water. The above components are modified and processed by injection molding to form a tetrahedral configuration.

[0075] The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution, and the weight percentages of the components are: 2% corn cobs, 5.5% sodium hydroxide, 4.5% potassium permanganate, and the balance is water. The specific preparation process is: put the weighed corn cobs into the sodium hydroxide solution, shake at room temperature for 24 hours, take out the corn cobs, and rinse them repeatedly with deionized water until the pH is close to neutral, then put the corn cobs into the potassium permanganate solution, shake and oxidize at room temperature for 4 hours, take out the corn cobs, and rinse them repeatedly with deionized water, and then dry them to obtain the modified corn cobs.

[0076] Treatment effect of domestic sewage with carrier structure:

[0077] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 85% and a removal rate of ammonia nitrogen exceeding 77%.

[0078] Example 8

[0079] Reference Figures 1 to 4 A tetrahedral magnetic biological carrier material, the tetrahedral configuration of the carrier material is composed of four support rods 1 and a central axis 2, the four faces of the spatial tetrahedron formed are exactly the same, and the bond angles formed between the central axis and the support rods are all 109.5°, the surface of the tetrahedron is corrugated, the interior of the tetrahedron is a tortuous space composed of a honeycomb, and the internal and external materials have pores, and the carrier material is formed by injection molding.

[0080] Specifically, the central axis 2 is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The support rod 1 is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of a honeycomb to form a tortuous space, and the materials inside and outside thereof are porous. The tortuous space inside the magnetic bio-carrier material (including the interior of the central axis and the interior of the support rod) is composed of a composite of transversely arranged open honeycombs and longitudinally arranged open honeycombs stacked and accumulated.

[0081] The carrier material is prepared from the following raw materials in mass fraction: 15.81% polypropylene, 8.21% ferroferric oxide, 15.442% modified corn cob, 15.34% diatomaceous earth, 1.46% yeast powder, 1.94% sodium alginate, 1.89% silane coupling agent, 2.43% ammonium carbonate, 0.87% liquid paraffin, 0.74% silicone oil, and the balance is water. The above components are modified and processed by injection molding to form a tetrahedral configuration.

[0082] The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution, and the weight percentages of the components are: 10% corn cobs, 18% sodium hydroxide, 15% potassium permanganate, and the balance is water. The specific preparation process is: put the weighed corn cobs into the sodium hydroxide solution, shake at room temperature for 24 hours, take out the corn cobs, and repeatedly rinse with deionized water until the pH is close to neutral, then put the corn cobs into the potassium permanganate solution, shake and oxidize at room temperature for 4 hours, take out the corn cobs, and repeatedly rinse with deionized water, and then dry them to obtain the modified corn cobs.

[0083] Treatment effect of domestic sewage with carrier structure:

[0084] Components of simulated wastewater: COD concentration is 120-175 mg·L -1 TN concentration: 13.4~21.7mg·L -1 , NH 4+ -N concentration 10.7~18.1mg·L -1 TP concentration: 3.5-4.5 mg·L -1 The tetrahedral magnetic biological carrier material was added to the simulated wastewater to form a biofilm. The carrier had a good removal effect on the simulated wastewater, with a removal rate of TN and TP of up to 82% and a removal rate of ammonia nitrogen exceeding 71%.

[0085] The present invention can promote microorganisms to quickly form stable biofilms on the outside and inside of the material. At the same time, the design of the tetrahedral configuration can increase the contact time between the microorganisms and the water body, which is beneficial to improving the degradation efficiency of pollutants. In addition, high molecular polymers are added to the carrier material to enhance the mechanical properties and acid and alkali resistance of the material.

Claims

1. A magnetic biological carrier material, characterized in that: The carrier material is in a tetrahedral configuration, which is composed of four supporting rods and a central axis. The four faces of the space tetrahedron formed by the support material are completely identical, and the bond angles formed between the central axis and the supporting rods are all 109.5°. The central axis is in the shape of a sphere, the surface of the sphere is corrugated, and the interior is composed of honeycombs to form a tortuous space, and the materials inside and outside the sphere have pores; the support rod is in the shape of a truncated cone, the diameter of the truncated cone surface connected to the central axis is larger than the diameter of the truncated cone surface far from the central axis, the surface of the support rod is corrugated, and the interior is composed of honeycombs to form a tortuous space, and the materials inside and outside the sphere have pores; the internal tortuous space of the magnetic biological carrier material is composed of open honeycombs arranged horizontally and open honeycombs arranged vertically stacked and compounded; The carrier material is prepared from the following raw materials in mass fraction: 13.35% polypropylene, 3.97% ferrosoferric oxide, 23.43% modified corn cob, 8.76% diatomaceous earth, 1.12% yeast powder, 0.97% sodium alginate, 1.19% silane coupling agent, 1.51% ammonium carbonate, 0.41% liquid paraffin, 0.45% silicone oil, and the balance is water; the above raw materials are modified to form uniform injection molding particles, which are then injection molded into tetrahedral magnetic biological carrier materials used for water treatment through a mold; The modified corn cob is prepared by soaking a certain amount of corn cobs in a sodium hydroxide solution and a potassium permanganate solution for modification, and the weight percentages of the components are: 5% corn cobs, 10.5% sodium hydroxide, 8.5% potassium permanganate, and the balance is water; the specific preparation process is: putting the weighed corn cobs into the sodium hydroxide solution, oscillating at room temperature for 24 hours, taking out the corn cobs, and repeatedly rinsing them with deionized water until the pH is close to neutral, and then putting the corn cobs into the potassium permanganate solution, performing an oscillating oxidation treatment at room temperature for 4 hours, taking out the corn cobs, and repeatedly rinsing them with deionized water, and then drying them to obtain the modified corn cobs.

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