A kind of air fiber three-dimensional biological filler and preparation method thereof

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to an air fiber three-dimensional biological filler and a preparation method thereof. The air fiber three-dimensional biological filler provided by the present invention comprises a fiber matrix layer of air fiber filaments composed of a filler mesh and a filler inner filament; the mass content of POE plastic in the raw materials of the filler mesh and the filler inner filament is 1% to 10%. The air fiber three-dimensional biological filler provided by the present invention has the characteristics of large surface area, not easy to be blocked, and convenient replacement. It can increase the biological attachment area, increase the amount of biofilm, and maintain good microbial activity, improve its toughness, processability and aging resistance, and have a better treatment effect.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an air fiber three-dimensional biological filler and a preparation method thereof. Background Art

[0002] Environmental friendliness is one of the important tasks to promote the healthy development of modern economy, among which preventing and controlling water pollution and realizing the rational use of water resources is one of its main tasks. Biological fillers are an effective means to increase the amount of sludge in the biochemical process of sewage treatment, the main carrier of biological contact oxidation and other processes, and the habitat of microorganisms. Biological fillers have a large specific surface area, which can provide a stable growth and reproduction space for microorganisms, enrich microorganisms, and thus improve the treatment effect of sewage.

[0003] Existing biological fillers often increase the internal structure of the filler in order to increase the specific surface area, reduce the internal space of the filler, and are prone to clogging problems. In addition, the aged biofilm attached to the filler is not easy to fall off and discharged, making it difficult to economically improve water treatment efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an air fiber three-dimensional biological filler and a preparation method thereof.

[0005] In a first aspect, the present invention provides an air fiber three-dimensional biological filler, which includes a fiber matrix layer of air fiber filaments composed of a filler mesh and filler inner filaments; the mass content of POE plastic in the raw materials of the filler mesh and the filler inner filaments is 1%~10%.

[0006] The air fiber three-dimensional biological filler provided by the present invention has the characteristics of large surface area, not easy to be blocked, convenient replacement, etc., and also effectively improves toughness and processability, and can provide a high-quality carrier for the growth of microorganisms.

[0007] Preferably, the raw materials include, by weight, 1 to 10 parts of POE plastic, 30 to 65 parts of PP, 2.3 to 8.6 parts of carbon source, 0.2 to 0.6 parts of trace elements, and 20 to 25 parts of activated carbon.

[0008] Further preferably, POE plastic 5-10 parts, PP 56-63 parts, carbon source 2.3-8.6 parts, trace elements 0.2-0.6 parts, activated carbon 20-25 parts. In the present invention, by optimizing the raw material composition and dosage of the air fiber three-dimensional biological filler, POE plastic and PP are combined, the filler specific surface area is increased, the biological attachment area is increased, and the biofilm amount is increased.

[0009] Further preferably, the POE plastic is a thermoplastic elastomer obtained by in-situ polymerization of ethylene and octene with a metallocene catalyst, and the mass ratio of ethylene to octene is 2 to 4: 1. More preferably, the POE plastic is a thermoplastic elastomer obtained by in-situ polymerization of ethylene and octene with a metallocene catalyst, and the mass ratio of ethylene to octene is 3:1.

[0010] More preferably, the carbon source is selected from one or more of sodium acetate, methanol, and glucose; the trace elements are iron and nickel in a mass ratio of 55:45 to 57:43, preferably iron: 56%; nickel: 44%. In the present invention, the activated carbon contains carbon, hydrogen and oxygen, and the specific type and parameters of the activated carbon are not limited.

[0011] The present invention optimizes the structure and parameters of the air fiber three-dimensional biological filler, as follows.

[0012] Preferably, the length of the three-dimensional air fiber biological filler is 1-3 m, the width is 150-210 cm, and the thickness is 5-40 mm; and / or the diameter of the air fiber wires of the filler mesh and the filler inner wire is 1-2 mm.

[0013] More preferably, the density of the wires in the filler is ≥ 40 wires / cm 2 , preferably 45~55 pieces / cm 2 ; and / or, the pore density of the filler mesh is 3 to 5 per cm 2 , preferably 4 to 5 pieces / cm 2 ; and / or, the shape of the packing mesh is selected from one or more of a hexagonal star ring, a parallelogram, a triangle and an equilateral pentagon; and / or, the shape of the inner wire of the packing is selected from one or more of a spiral wire, a broken wire, a circular ring wire and a T-shaped wire.

[0014] In the present invention, the amount of filler biofilm can be doubled by combining filler components, selecting wire density and optimizing mesh shape, and the improvement effect is more prominent under the preferred parameters.

[0015] According to the air fiber three-dimensional biological filler provided by the present invention, the specific surface area of ​​the air fiber three-dimensional biological filler is ≥2000m 2 / m 3 , breaking force ≥5000N, film-forming time ≤3d, film weight ≥1200g / m 2 , total nitrogen load ≥ 0.3kgTN / m 3 ·d, ammonia nitrogen load ≥ 0.5kgNH3 / m 3 ·d, BOD volume load ≥ 1.5kgBOD5 / m 3 ·d, COD volume load ≥ 3.0kgCOD5 / m 3 ·d.

[0016] Preferably, the specific surface area of ​​the air fiber three-dimensional biological filler is 2500~3000m 2 / m 3 , breaking force 5000~7000N, film-forming time 2.5~3d, film weight 1200~1500g / m 2 , total nitrogen load 0.3~0.35kgTN / m 3 ·d, ammonia nitrogen load 0.5~0.55kgNH3 / m 3 ·d, BOD volume load 1.5~1.6kgBOD5 / m 3 ·d, COD volume load 3.0~3.5kgCOD5 / m 3 ·d.

[0017] According to the present invention, POE plastic is a thermoplastic elastomer that is polymerized in situ by ethylene and octene using a metallocene catalyst, and its characteristics are: (1) The soft chain curling structure of octene and the crystalline ethylene chain serve as physical crosslinking points, which makes it have both excellent toughness and good processability. (2) There are no unsaturated double bonds in the molecular structure of POE plastic, and it has excellent aging resistance. (3) POE plastic has a narrow molecular weight distribution, good fluidity, and good compatibility with polyolefins. (4) Good fluidity can improve the dispersion effect of fillers and also improve the weld mark strength of the product. With the increase of POE plastic content, the impact strength and elongation at break of the system are greatly improved. It can be seen that POE plastic has an excellent toughening effect on PP and has good compatibility with PP and activated calcium carbonate. This is because the molecular weight distribution of POE plastic is narrow, and the side octyl group in the molecular structure is longer than the side ethyl group, which can form a connection point in the molecular structure, play a role in connecting and buffering between the components, so that the system can disperse and buffer the impact energy when it is impacted, reducing the chance of silver streaks developing into cracks due to force, thereby improving the impact strength of the system. When the system is subjected to tension, the network structure formed by these connection points can undergo a large deformation, so the elongation at break of the system increases significantly. When the content of POE plastic increases, the tensile strength, bending strength and bending modulus of the system all decrease. This is determined by the performance of POE plastic itself, so the content of POE plastic should be controlled below 15%. The relationship between the content of POE plastic and the melt index. After adding POE plastic, the melt index of the system increases. POE plastic itself has good fluidity. Its addition also improves the fluidity of the entire system. When the content of POE plastic exceeds 15%, the melt index of the system basically does not change. If you want to continue to improve the fluidity of the system, you cannot rely entirely on POE plastic.

[0018] In a second aspect, the present invention provides a method for preparing the air fiber three-dimensional biological filler, comprising:

[0019] 1) Heat the material to 220~275℃ to obtain hot-melt raw materials.

[0020] 2) Using a computer processing program, the hot-melted raw material obtained in step 1) is 3D-shaped to obtain a 3D-shaped material.

[0021] 3) The 3D-shaped material obtained in step 2) is integrally bonded with an adhesive to obtain a biofiller precursor.

[0022] 4) Rapidly cooling the biofiller precursor obtained in step 3).

[0023] Preferably, in step 1), the heating temperature is 230-265° C. and the heating time is 20-30 min.

[0024] Preferably, in step 2), the raw material for 3D printing is a mixture of the above ingredients.

[0025] Preferably, in step 3), the adhesive is an adhesive, such as a silicone adhesive or a high-temperature adhesive.

[0026] Preferably, in step 4), the cooling is performed in a cooling workshop; preferably, direct cooling is adopted, the evaporator of the refrigerator is installed in the cooling workshop, the air therein is directly cooled by evaporation of the refrigerant, and the packing is cooled by the cold air.

[0027] The present invention adopts the above-mentioned fast-melting and fast-cooling processing technology, and under the effect of computer programming, raw materials and optimal parameters, can better prepare high-performance fillers and greatly improve the processing efficiency.

[0028] In a third aspect, the present invention provides the use of the air fiber three-dimensional biological filler or the air fiber three-dimensional biological filler prepared by the preparation method of the air fiber three-dimensional biological filler in sewage treatment.

[0029] The beneficial effects of the present invention are at least that: the air fiber three-dimensional biological filler provided by the present invention is composed of a fiber matrix layer of air fiber filaments of a filler mesh and a filler inner filament, which can form a large number of gaps. Through the combination and layout of the air fiber filaments, the specific surface area of ​​the filler is increased, the biological attachment area is increased, the amount of biofilm is increased, and good microbial activity is maintained. The present invention effectively improves the material properties of the fiber matrix layer so that it has both excellent toughness and good processability. There is no unsaturated double bond in the molecular structure of POE plastic, and it has excellent aging resistance, so that the fluidized bed high-efficiency suspended filler has a better treatment effect. The present invention can make the unused bubbles filled in the aeration system into the water quickly released before entering the anoxic zone, solving the problem that the existing nitrification liquid reflux has too much dissolved oxygen and affects the denitrification rate. It has good metabolism and will not form agglomerates. The system can effectively cut bubbles and improve the transfer rate and utilization rate of oxygen. The water and gas biofilm is fully exchanged, and the organic matter in the water is efficiently treated. It has the characteristics of large space volume utilization and no dead zone. The filler can be used as a biological carrier for hydrolysis acidification, contact oxidation, anaerobic or aerobic fluidized bed and expanded bed and biological filter. When it is directly added to the ordinary activated sludge treatment system, it can greatly improve the treatment capacity and efficiency of the original system without changing all the operating conditions of the original system, and obtain good nitrogen removal and phosphorus removal effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A plan view of the air fiber three-dimensional biological filler provided in an embodiment of the present invention.

[0032] Figure 2 A side view of the air fiber three-dimensional biological filler provided in an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the air fiber three-dimensional biological filler provided in Example 1 of the present invention.

[0034] Figure 4 Schematic diagram of the air fiber three-dimensional biological filler provided in Example 2 of the present invention.

[0035] Figure 5 Schematic diagram of the air fiber three-dimensional biological filler provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] If no specific technology or conditions are specified in the embodiments of the present invention, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the devices, instruments, reagents, etc. is not specified, they are all conventional products that can be purchased through regular channels. The raw materials used in the present invention can be easily purchased in the domestic product market.

[0038] In the following embodiments of the present invention, the POE plastic used is a thermoplastic elastomer that is polymerized in situ by metallocene catalyst of ethylene and octene (3:1), specifically, Dow modified POE is used, and the PP used is a modified material purchased from Total in South Korea. The glue used is a silicone adhesive. The cooling is direct cooling, the evaporator of the refrigerator is installed in the cooling workshop, the air therein is directly cooled by the evaporation of the refrigerant, and the packing is cooled by the cold air.

[0039] Example 1

[0040] This embodiment provides an air fiber three-dimensional biological filler, whose raw material composition is: 10 parts of POE plastic, 59 parts of PP, 8.5 parts of carbon source, 0.5 parts of trace elements, and 22 parts of activated carbon; the carbon source is sodium acetate, and the trace elements are iron: 55%; nickel: 45%. The structure of the air fiber three-dimensional biological filler provided in this embodiment is as follows Figure 1~2 As shown, the air fiber three-dimensional biological filler is a rectangular parallelepiped (such as Figure 3 The air fiber three-dimensional biological filler is a fiber matrix layer of air fiber filaments composed of a filler mesh and filler inner filaments, and the density of the filler inner filaments is 50 filaments / cm 2 ; The hole density of the packing mesh is 4 / cm 2 The shape of the packing mesh is a hexagonal star ring, and the shape of the inner wire of the packing is a spiral wire.

[0041] This embodiment also provides a method for preparing the air fiber three-dimensional biological filler, and the specific steps are as follows:

[0042] 1) Mix the raw materials and heat them at a temperature of 245~250℃ for 25±1min.

[0043] 2) Use computer programming and 3D printing.

[0044] 3) Use glue to bond the ends of the wires and then transfer them to the cooling workshop for cooling.

[0045] The air fiber three-dimensional biological filler of the embodiment was tested: the filler was tested for biofilm growth using activated sludge from a biological pond. The test method and conditions were as follows: the filler was immersed in a biological pond, the bottom was aerated, and the weight of the filler was measured regularly to obtain the amount of biofilm growth.

[0046] Test results: The specific surface area of ​​the air fiber three-dimensional biological filler provided in this embodiment is 2700m 2 / m 3 , breaking force 6000N, film-forming time 3d, film weight 1400g / m 2 , total nitrogen load 0.32kgTN / m 3 ·d, ammonia nitrogen load 0.53kgNH3 / m 3 ·d, BOD volume load 1.55kgBOD5 / m 3 ·d, COD volume load 3.2kgCOD5 / m 3 ·d.

[0047] Example 2

[0048] This embodiment provides an air fiber three-dimensional biological filler, whose raw material composition is: 9 parts of POE plastic, 60 parts of PP, 8.4 parts of carbon source, 0.6 parts of trace elements, and 22 parts of activated carbon; the carbon source is methanol, and the trace elements are iron: 50%; nickel: 50%. The air fiber three-dimensional biological filler provided in this embodiment is a rectangular parallelepiped (such as Figure 4 The air fiber three-dimensional biological filler is a fiber matrix layer of air fiber filaments composed of a filler mesh and filler inner filaments, and the density of the filler inner filaments is 45 filaments / cm 2 ; The hole density of the packing mesh is 5 / cm 2 The shape of the packing mesh is a hexagonal star ring, and the shape of the packing inner wire is a circular ring wire.

[0049] This embodiment also provides a method for preparing the air fiber three-dimensional biological filler, and the specific steps are as follows:

[0050] 1) Mix the raw materials and heat them at a temperature of 245~250℃ for 25±1min.

[0051] 2) Use computer programming and 3D printing.

[0052] 3) Use glue to bond the ends of the wires and then transfer them to the cooling workshop for cooling.

[0053] The specific surface area of ​​the air fiber three-dimensional biological filler provided in this embodiment is 2800m 2 / m3 , breaking force 5500N, film-forming time 2.6d, film weight 1350g / m 2 , total nitrogen load 0.31kgTN / m 3 ·d, ammonia nitrogen load 0.52kgNH3 / m 3 ·d, BOD volume load 1.53kgBOD5 / m 3 ·d, COD volume load 3.1kgCOD5 / m 3 ·d.

[0054] Example 3

[0055] This embodiment provides an air fiber three-dimensional biological filler, whose raw material composition is: 9 parts of POE plastic, 59 parts of PP, 8.4 parts of carbon source, 0.6 parts of trace elements, and 23 parts of activated carbon; the carbon source is methanol, and the trace elements are iron: 60%; nickel: 40%. The air fiber three-dimensional biological filler provided in this embodiment is a rectangular parallelepiped (such as Figure 5 The air fiber three-dimensional biological filler is a fiber matrix layer of air fiber filaments composed of a filler mesh and filler inner filaments, and the density of the filler inner filaments is 48 filaments / cm 2 ; The hole density of the packing mesh is 4 / cm 2 The shape of the packing mesh sleeve is a hexagonal star ring, and the shape of the packing inner wire is a T-shaped wire.

[0056] This embodiment also provides a method for preparing the air fiber three-dimensional biological filler, and the specific steps are as follows:

[0057] 1) Mix the raw materials and heat them at a temperature of 245~250℃ for 25±1min.

[0058] 2) Use computer programming and 3D printing.

[0059] 3) Use glue to bond the ends of the wires and then transfer them to the cooling workshop for cooling.

[0060] The specific surface area of ​​the air fiber three-dimensional biological filler provided in this embodiment is 2850m 2 / m 3 , breaking force 5600N, film-forming time 2.8d, film weight 1400g / m 2 , total nitrogen load 0.3kgTN / m 3 ·d, ammonia nitrogen load 0.5kgNH3 / m 3 ·d, BOD volume load 1.5kgBOD5 / m 3 ·d, COD volume load 3.2kgCOD5 / m 3 ·d.

[0061] Comparative Example 1

[0062] This comparative example provides an air fiber three-dimensional biological filler, whose raw material composition is: PP68 parts, carbon source 8.4 parts, trace elements 0.6 parts, activated carbon 23 parts; the carbon source is methanol, and the trace elements are iron: 60%; nickel: 40%. The air fiber three-dimensional biological filler provided in this embodiment is a rectangular parallelepiped (length 2m, width 1.5m, thickness 20mm); the air fiber three-dimensional biological filler is a fiber matrix layer of air fiber filaments composed of a filler mesh and a filler inner filament, and the filament density of the filler inner filament is 48 filaments / cm 2 ; The hole density of the packing mesh is 4 / cm 2 The shape of the packing mesh sleeve is a hexagonal star ring, and the shape of the packing inner wire is a T-shaped wire.

[0063] This comparative example also provides a method for preparing the air fiber three-dimensional biological filler, and the specific steps are as follows:

[0064] 1) Mix the raw materials and heat them at a temperature of 245~250℃ for 25±1min.

[0065] 2) Use computer programming and 3D printing.

[0066] 3) Use glue to bond the ends of the wires and then transfer them to the cooling workshop for cooling.

[0067] The specific surface area of ​​the air fiber three-dimensional biological filler provided in this comparative example is 1500m 2 / m 3 , breaking force 4000N, film-forming time 1d, film weight 860g / m 2 , total nitrogen load 0.38kgTN / m 3 ·d, ammonia nitrogen load 0.59kgNH3 / m 3 ·d, BOD volume load 2.3kgBOD5 / m 3 ·d, COD volume load 4.3kgCOD5 / m 3 ·d.

[0068] Comparative Example 2

[0069] This comparative example provides an air fiber three-dimensional biological filler, whose raw material composition is: POE 9 parts, PP 59 parts, carbon source 8.4 parts, trace elements 0.6 parts, activated carbon 23 parts; the carbon source is methanol, and the trace elements are iron: 60% by mass; nickel: 40%. The air fiber three-dimensional biological filler provided in this embodiment is a rectangular parallelepiped (length 2m, width 1.5m, thickness 20mm); the air fiber three-dimensional biological filler is a fiber matrix layer of air fiber filaments composed of a filler mesh and filler inner filaments, and the filament density of the filler inner filaments is 48 filaments / cm 2; The hole density of the packing mesh is 1 / cm 2 The shape of the packing mesh is a hexagonal star ring, and the shape of the inner wire of the packing is a straight wire.

[0070] This comparative example also provides a method for preparing the air fiber three-dimensional biological filler, and the specific steps are as follows:

[0071] 1) Mix the raw materials and heat them at a temperature of 245~250℃ for 25±1min.

[0072] 2) Use computer programming and 3D printing.

[0073] 3) Use glue to bond the ends of the wires and then transfer them to the cooling workshop for cooling.

[0074] The specific surface area of ​​the air fiber three-dimensional biological filler provided in this comparative example is 600m 2 / m 3 , breaking force 3500N, film hanging time 0.5d, film weight 750g / m 2 , total nitrogen load 0.39kgTN / m 3 ·d, ammonia nitrogen load 0.60kgNH3 / m 3 ·d, BOD volume load 2.5kgBOD5 / m 3 ·d, COD volume load 4.5kgCOD5 / m 3 ·d.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air fiber three-dimensional biological filler, characterized in that: The air fiber three-dimensional biological filler comprises an air fiber fiber matrix layer composed of a filler mesh and a filler inner wire; the mass content of POE plastic in the raw materials of the filler mesh and the filler inner wire is 1% to 10%; The raw materials include 9 parts of POE plastic, 59 parts of PP, 8.4 parts of carbon source, 0.6 parts of trace elements, and 23 parts of activated carbon by weight; the carbon source is selected from methanol; the trace elements are 60% iron and 40% nickel by weight; The density of the wire in the filler is 48 wires / cm 2 The hole density of the packing mesh is 4 / cm 2 ; The shape of the packing mesh is a hexagonal star ring; the shape of the inner wire of the packing is a T-wire; The POE plastic is a thermoplastic elastomer obtained by in-situ polymerization of ethylene and octene using a metallocene catalyst, wherein the mass ratio of ethylene to octene is 3:1; The air fiber three-dimensional biological filler has a length of 2m, a width of 150cm and a thickness of 20mm.

2. The air fiber three-dimensional biological filler according to claim 1, characterized in that: The specific surface area of ​​the air fiber three-dimensional biological filler is 2850m 2 / m 3 , breaking force 5600N, film-forming time 2.8d, film weight 1400g / m 2 , total nitrogen load 0.3kgTN / m 3 ·d, ammonia nitrogen load 0.5kgNH3 / m 3 ·d, BOD volume load 1.5kgBOD5 / m 3 ·d, COD volume load 3.2kgCOD5 / m 3 ·d.

3. The method for preparing the air fiber three-dimensional biological filler according to claim 1 or 2, characterized in that: include: 1) Mix the raw materials and heat them at a temperature of 245~250℃ for 25±1min; 2) Using computer programming and 3D printing; 3) Use glue to bond the ends of the wires and then transfer them to the cooling workshop for cooling.

4. Use of the air fiber three-dimensional biological filler according to claim 1 or 2 or the air fiber three-dimensional biological filler prepared by the preparation method of the air fiber three-dimensional biological filler according to claim 3 in sewage treatment.

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