Sulfur-based fiber autotrophic nitrogen removal and denitrification biological carrier and surface area expansion method

Abstract

The invention discloses a sulfur-based fiber autotrophic nitrogen removal and denitrification biological carrier and a surface area expansion method, the sulfur-based fiber autotrophic nitrogen removal and denitrification biological carrier comprises a hollow outer porous carrier and an inner porous carrier, the outer porous carrier is rotatably arranged outside the inner porous carrier, a cavity of the inner porous carrier is filled with a filler, and the filler is arranged between the outer porous carrier and the inner porous carrier. And the size of the filler is greater than that of the pore diameter of the inner porous carrier. The external porous carrier is arranged, so that the aperture number of the biological carrier can be increased, and the specific surface area of the biological carrier is further increased; meanwhile, the outer porous carrier can protect the inner porous carrier, the impact of fluid on the inner porous carrier is reduced, and the strength of the biological carrier is improved; when the biological carrier is used in fluid such as sewage, the outer porous carrier rotates under the washing of the fluid, and the flowing direction of the fluid is continuously changed, so that more microorganisms are attached to the surface of the biological carrier, a biological membrane is formed, a reaction interface is increased, and the sewage treatment effect is improved.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and particularly to a sulfur-based fiber autotrophic denitrification biological carrier and a surface area expansion method. Background Art

[0002] The sulfur autotrophic denitrification technology has gradually received extensive attention in the domestic and foreign water treatment fields due to its advantages such as no need for external organic carbon sources, low sludge production, and low price. This technology mainly uses sulfur autotrophic denitrifying bacteria to reduce nitrate by using inorganic sulfur sources such as elemental sulfur, pyrite, and thiosulfate as electron donors to complete denitrification.

[0003] Sulfur is a non-polar substance and is insoluble in water. The efficiency of sulfur autotrophic fillers depends to a large extent on the accessibility of sulfur to the biofilm. In the process of sulfur autotrophic denitrification, the mass transfer efficiency of elemental sulfur from the solid phase to the biofilm surface is the rate-limiting step of the whole reaction process.

[0004] The specific surface area of sulfur autotrophic fillers is an important factor restricting the surface reaction rate of the sulfur autotrophic denitrification process. Because increasing the specific surface area can promote the dissolution of elemental sulfur on the one hand and promote the effective contact between microorganisms and elemental sulfur on the other hand, the increase in the specific surface area of sulfur autotrophic fillers can significantly improve the denitrification rate of the sulfur autotrophic denitrification system. Summary of the Invention

[0005] The purpose of the present invention is to provide a sulfur-based fiber autotrophic denitrification biological carrier and a surface area expansion method to solve the problems of small specific surface area, low sulfur dispersion degree, and poor strength of the sulfur-based fiber autotrophic denitrification biological carrier in the prior art.

[0006] To achieve the above invention purpose, the technical solution of the present invention is:

[0007] A sulfur-based fiber autotrophic denitrification biological carrier includes a hollow outer porous carrier and an inner porous carrier. The outer porous carrier is rotatably arranged outside the inner porous carrier. The cavity of the inner porous carrier is filled with fillers, and the size of the fillers is larger than the size of the pore diameter of the inner porous carrier. Setting the outer porous carrier can increase the number of pore diameters of the biological carrier, thereby increasing the specific surface area of the biological carrier; at the same time, the outer porous carrier can also protect the inner porous carrier and reduce the impact of the fluid on the inner porous carrier, improving the strength of the biological carrier; and when the biological carrier is used in fluids such as sewage, the outer porous carrier rotates under the scouring of the fluid, continuously changing the flow direction of the fluid, so that more microorganisms adhere to the surface of the biological carrier to form a biofilm, increasing the reaction interface and improving the sewage treatment effect.

[0008] Preferably, the inner porous carrier is a sphere, and fixing shafts are symmetrically fixed on the outer circumference of the inner porous carrier. Grooves adapted to the fixing shafts are provided on the inner wall of the outer porous carrier, and the fixing shafts are rotatably arranged in the grooves.

[0009] Preferably, two limiting blocks are provided on the outer circumference of the inner porous carrier, and a limiting plate is provided on the inner wall of the outer porous carrier, and the limiting plate is movable between the two limiting blocks. The arrangement of the limiting blocks and the limiting plate makes the rotation amplitude of the outer porous carrier small, so as to quickly and continuously change the flow direction of the fluid, not only disturbing the sewage and accelerating film hanging, but also avoiding the fluid from concentrating on flushing a certain place of the outer porous carrier.

[0010] Preferably, the inner porous carrier and the outer porous carrier have the same pore diameter. If the pore diameter is too large, the fluid can pass through quickly, and the flow direction of the fluid is not easy to change; if the pore diameter is too small, the speed of the fluid passing through will be reduced, affecting the sewage treatment efficiency.

[0011] Preferably, the filler is a single filler or a mixed filler.

[0012] Preferably, a number of wavy protrusions are provided on the inner wall of the outer porous carrier, and a medium channel is formed between adjacent protrusions. The protrusions can increase the roughness of the biological carrier, increase the effective surface area, and also improve the impact resistance of the outer porous carrier; the medium channel has a guiding effect and improves the flow effect inside the biological carrier.

[0013] Preferably, both the outer porous carrier and the inner porous carrier are loaded with elemental sulfur, and the mass of the elemental sulfur is 15%-28% of the mass of the porous carrier.

[0014] Preferably, both the inner porous carrier and the outer porous carrier are injection-molded at one time from a modified polypropylene material, high-density polyethylene or acrylonitrile-butadiene-styrene copolymer.

[0015] The present invention also provides a method for expanding the specific surface area of a biological carrier, including the above-mentioned sulfur-based fiber autotrophic denitrification and denitrification biological carrier.

[0016] Preferably, the inner porous carrier and the outer porous carrier are immersed in a solvent dissolved with elemental sulfur and dried, and the drying temperature is 110-155°C; the solvent includes carbon disulfide, and the mass of carbon disulfide is 3 times the mass of elemental sulfur.

[0017] The beneficial effects of the present invention are:

[0018] 1. In the present invention, an outer porous carrier is provided, which can increase the number of pore diameters of the biological carrier, thereby increasing the specific surface area of the biological carrier. At the same time, the outer porous carrier can also protect the inner porous carrier, reduce the impact of the fluid on the inner porous carrier, and improve the strength of the biological carrier. Moreover, when the biological carrier is used in fluids such as sewage, the outer porous carrier rotates under the scouring of the fluid, continuously changing the flow direction of the fluid, so that more microorganisms adhere to the surface of the biological carrier, form a biofilm, increase the reaction interface, and improve the sewage treatment effect.

[0019] 2. In the present invention, a limiting block and a limiting plate are provided, so that the rotation amplitude of the outer porous carrier is small, thereby quickly and continuously changing the flow direction of the fluid, not only disturbing the sewage and accelerating film formation, but also avoiding the fluid from concentrating on scouring a certain place of the outer porous carrier.

[0020] 3. In the present invention, the protrusions can increase the roughness of the biological carrier, increase the effective surface area, and also improve the impact resistance of the outer porous carrier; the medium channels have a guiding effect and improve the internal circulation effect of the biological carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the outer porous carrier.

[0023] In the figure:

[0024] 1. Outer porous carrier; 11. Groove; 2. Inner porous carrier; 21. Fixed shaft; 3. Limiting block; 4. Limiting plate; 5. Protrusion; 6. Medium channel; 7. Filler. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings.

[0026] The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] As Figure 1As shown in the figure, a sulfur-based fiber autotrophic denitrifying biocarrier includes a hollow outer porous carrier 1 and an inner porous carrier 2. The pore sizes of the inner porous carrier 2 and the outer porous carrier 1 are the same. The inner porous carrier 2 is a sphere, and the outer porous carrier 1 can be but is not limited to a sphere. Elemental sulfur is loaded on both the outer porous carrier 1 and the inner porous carrier 2, and the mass of the elemental sulfur is 15%-28% of the mass of the porous carrier. The outer porous carrier 1 is rotatably arranged outside the inner porous carrier 2. Specifically, fixing shafts 21 are symmetrically fixed on the outer circumference of the inner porous carrier 2, and grooves 11 adapted to the fixing shafts 21 are provided on the inner wall of the outer porous carrier 1, and the fixing shafts 21 are rotatably arranged in the grooves 11. The cavity of the inner porous carrier 2 is filled with a filler 7, and the size of the filler 7 is larger than the pore size of the inner porous carrier 2. The filler 7 is a single filler 7 or a mixed filler 7, and the filler 7 is aldehydeized vinylon filaments, polyethylene flat filaments, etc.

[0029] Both the inner porous carrier 2 and the outer porous carrier 1 are injection-molded once from modified polypropylene materials, high-density polyethylene, or acrylonitrile-butadiene-styrene copolymer. When high-density polyethylene is selected, the inner and outer porous carriers are composed of the following components in parts by weight:

[0030]

[0031] The magnetic powder is one or more of ferric oxide magnetic, manganese zinc ferrite, and nickel zinc ferrite.

[0032] As Figure 1 and Figure 2 shown in the figure, two limiting blocks 3 are provided on the outer circumference of the inner porous carrier 2, a limiting plate 4 is provided on the inner wall of the outer porous carrier 1, and the limiting plate 4 is movable between the two limiting blocks 3. A number of wavy protrusions 5 are provided on the inner wall of the outer porous carrier 1, and a medium channel 6 is formed between adjacent protrusions 5.

[0033] Example 2

[0034] A method for expanding the specific surface area of a biocarrier includes the sulfur-based fiber autotrophic denitrifying biocarrier in Example 1. Among them, the inner porous carrier 2 and the outer porous carrier 1 are immersed in a solvent dissolved with elemental sulfur and dried, and the drying temperature is 110-155°C. The solvent includes carbon disulfide, and the mass of carbon disulfide is 3 times the mass of elemental sulfur.

[0035] The described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. A sulfur-based fiber autotrophic denitrifying biological carrier, characterized in that, It includes a hollow outer porous carrier and an inner porous carrier. The outer porous carrier is rotatably arranged outside the inner porous carrier. The cavity of the inner porous carrier is filled with a filler, and the size of the filler is larger than the size of the pore diameter of the inner porous carrier.

2. The sulfur-based fiber autotrophic denitrification biological carrier according to claim 1, characterized in that, The inner porous carrier is a sphere. Fixed shafts are symmetrically fixed on the outer circumference of the inner porous carrier. Grooves adapted to the fixed shafts are provided on the inner wall of the outer porous carrier, and the fixed shafts are rotatably arranged in the grooves.

3. The sulfur-based fiber autotrophic denitrification biological carrier according to claim 2, characterized in that, Two limiting blocks are provided on the outer circumference of the inner porous carrier. A limiting plate is provided on the inner wall of the outer porous carrier, and the limiting plate is movable within the space between the two limiting blocks.

4. The sulfur-based fiber autotrophic denitrifying biological carrier according to claim 3, characterized in that, The inner porous carrier and the outer porous carrier have the same pore diameter.

5. The sulfur-based fiber autotrophic denitrifying biological carrier according to claim 4, characterized in that, The filler is a single filler or a mixed filler.

6. The sulfur-based fiber autotrophic denitrifying biocarrier according to claim 5, characterized in that, Several wavy protrusions are provided on the inner wall of the outer porous carrier, and a medium channel is formed between adjacent protrusions.

7. The sulfur-based fiber autotrophic denitrifying biological carrier according to claim 6, characterized in that, Both the outer porous carrier and the inner porous carrier are loaded with elemental sulfur, and the mass of the elemental sulfur is 15%-28% of the mass of the porous carrier.

8. The sulfur-based fiber autotrophic denitrifying biological carrier according to claim 7, characterized in that, Both the inner porous carrier and the outer porous carrier are injection-molded at one time from a modified polypropylene material, high-density polyethylene or acrylonitrile-butadiene-styrene copolymer.

9. A method for expanding the specific surface area of a biological carrier, characterized in that, It includes the sulfur-based fiber autotrophic denitrification biological carrier according to any one of claims 1-8.

10. The method for expanding the specific surface area of the biological carrier according to claim 8, characterized in that, Immerse the inner porous carrier and the outer porous carrier in a solvent dissolved with elemental sulfur, and then dry them. The drying temperature is 110-155 °C; The solvent includes carbon disulfide, and the mass of carbon disulfide is 3 times the mass of elemental sulfur.

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