Preparation method of biofilm suspended filler, biofilm suspended filler and application thereof

Abstract

The present application relates to a kind of biological membrane suspension filler preparation method, biological membrane suspension filler and its application, the method comprises: S1, by means of Mslattice software control TPMS's modeling method, topological structure, the relative density of filler, the radius of filler and the cell size of filler, output corresponding filler model;S2, using 3D printing equipment adopts pre-specified printing material according to the filler model is printed, obtains biological membrane suspension filler.The biological membrane suspension filler of the present application is prepared by the above preparation method.The biological membrane suspension filler of the present application is applied in the field of water treatment.The biological membrane suspension filler of the present application increases the effective specific surface area to provide more attachment space for microorganism, while promoting mass transfer, ensuring the stable attachment and growth of biological membrane suspension filler, and ultimately significantly improving the performance of moving bed biological membrane reactor.

Description

Technical Field

[0001] This invention relates to the field of water treatment materials technology, and in particular to a method for preparing a biofilm suspended packing, the biofilm suspended packing, and its applications. Background Technology

[0002] Moving-bed biofilm reactors (MBBRs) are one of the most important technologies widely used in wastewater treatment plants, enabling nitrification, denitrification, and the removal of organic matter, nitrogen, and phosphorus.

[0003] Suspended biological carriers are a key component in moving bed biofilm reactors, enabling the enrichment of microorganisms to form biofilms and degrade pollutants. Porous structures are widely used in biological packing materials. Compared to solid materials, porous structures have a relatively large specific surface area, providing sufficient space for cell attachment and growth. However, current production processes for suspended carriers remain at the injection molding level, resulting in carriers with simple structures, small pore spaces, and a high tendency to clog. Excessive biofilm growth restricts oxygen transport to deeper biofilm layers, leading to biofilm detachment and reduced nutrient removal performance. Typically, any improvement in the performance of moving bed biofilm reactors is limited by the balance between available surface area per unit volume and structural complexity, which in turn is constrained by the manufacturability of more complex designs. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for preparing a biofilm suspension packing, the biofilm suspension packing, and its application. This invention solves the technical problem that the production process of suspension carriers in the prior art remains at the injection molding level, resulting in carriers with simple structures, small pore spaces, and extremely high clogging tendency. Excessive biofilm growth restricts oxygen transport to deeper biofilm layers, leading to biofilm detachment and thus reducing nutrient removal performance.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, embodiments of the present invention provide a method for preparing a biofilm suspension packing material, the method comprising:

[0009] S1. Using Mslattice software, adjust the modeling method, topology, relative density of fillers, radius of fillers, and cell size of fillers in TPMS to output the corresponding filler model.

[0010] S2. Using a 3D printing device, print the biofilm suspension packing material according to the pre-specified printing material to obtain the biofilm suspension packing.

[0011] Preferably, the modeling method of the TPMS is a patch network modeling method.

[0012] Preferably, the topology of the TPMS is Gyroid.

[0013] Preferably, the radius of the filler is 5-25 mm;

[0014] The cell size of the filler is 5-25 mm.

[0015] Preferably, the relative density of the filler is 15% to 50%.

[0016] Preferably, the relative density of the filler satisfies formula (1);

[0017] Formula (1) is as follows:

[0018]

[0019] Where RD is the relative density of the filler;

[0020] L is the unit cell size;

[0021] t is the wall thickness of the packing.

[0022] Preferably, the curvature parameter C in the Gyroid satisfies formula (2);

[0023] The formula (2) is:

[0024] C = (RD + 1.806) / 67.91.

[0025] Preferably,

[0026] The parameters of the 3D printing equipment are set as follows: layer thickness 25um-75um; initial exposure 30s-70s; printing exposure 2.5s-7.5s; printing rise height 4mm-12mm; motor speed 1mm / s-10mm / s; lamp-off delay 1s-7s; number of bottom layers exposed 1-4.

[0027] The pre-specified printing material is photosensitive resin.

[0028] Secondly, this embodiment also provides a biofilm suspension packing material, which is prepared by any of the above-described preparation methods.

[0029] On the other hand, this embodiment also provides an application of the aforementioned biofilm suspended packing material in the field of water treatment.

[0030] (III) Beneficial Effects

[0031] The beneficial effects of this invention are as follows: The method for preparing a biofilm suspended packing material of this invention involves designing a corresponding packing model based on a predetermined TPMS modeling method, topology, relative density of the packing material, radius of the packing material, and cell size of the packing material. Then, 3D printing technology is used to print the biofilm suspended packing material according to the packing model. Compared with existing technologies, the biofilm suspended packing material obtained by 3D printing endows the biological carrier structure with a high degree of complexity and overcomes the limitations of manufacturability in complex designs. By controlling the TPMS structure through the selected parameter combinations such as relative density and cell size, the effective specific surface area is increased, providing more attachment space for microorganisms, promoting mass transfer, ensuring stable attachment and growth of the biofilm suspended packing material, and ultimately significantly improving the performance of the moving bed biofilm reactor. Attached Figure Description

[0032] Figure 1 This is a flowchart of a method for preparing a biofilm suspension packing material according to the present invention;

[0033] Figure 2 This is a schematic diagram of a structure of the biofilm suspension packing material in Embodiment 2 of the present invention;

[0034] Figure 3 This is a schematic diagram of another structure of the biofilm suspension packing material in Embodiment 2 of the present invention;

[0035] Figure 4 This is a schematic diagram of the unit cell structure in Embodiment 2 of the present invention;

[0036] Figure 5 This is the Fourier transform infrared spectrum of the biofilm suspension packing material in Embodiment 2 of the present invention. Detailed Implementation

[0037] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0039] Example 1

[0040] See Figure 1This embodiment provides a method for preparing a biofilm suspension packing material, the method comprising:

[0041] S1. Using Mslattice software, adjust the modeling method, topology, relative density of the filler, radius of the filler, and cell size of the filler in TPMS to output the corresponding filler model.

[0042] In this embodiment, the TPMS is modeled using a sheet network modeling method; the TPMS topology is Gyroid; the filler radius is 5-25 mm; the filler cell size is 5-25 mm; and the filler relative density is 15%–50%.

[0043] In the practical application of this embodiment, the relative density of the filler satisfies formula (1).

[0044] Formula (1) is as follows:

[0045]

[0046] Where RD is the relative density of the filler; L is the cell size; t is the wall thickness of the filler; and m = 3.09.

[0047] In this embodiment, the TPMS structure corresponding to m=3.09 has more than 10 times higher fluid permeability and adhesion than other similar TPMS structures, while also possessing flexible design space, isotropic elasticity, and sufficiently uniform Gaussian curvature.

[0048] Specifically, the curvature parameter C in the Gyroid satisfies formula (2);

[0049] The formula (2) is:

[0050] C = (RD + 1.806) / 67.91.

[0051] S2. Using a 3D printing device, print the biofilm suspension packing material according to the pre-specified printing material to obtain the biofilm suspension packing.

[0052] The parameters of the 3D printing equipment are set as follows: layer thickness 25um-75um; initial exposure 30s-70s; printing exposure 2.5s-7.5s; printing rise height 4mm-12mm; motor speed 1mm / s-10mm / s; lamp-off delay 1s-7s; number of bottom layer exposures 1-4.

[0053] The pre-specified printing material is photosensitive resin.

[0054] This embodiment describes a method for preparing a biofilm suspension packing material. Based on a predetermined TPMS modeling method, topology, relative density of the packing material, radius of the packing material, and cell size of the packing material, a corresponding packing material model is designed. Then, 3D printing technology is used to print the biofilm suspension packing material according to the packing material model. Compared to existing technologies, the biofilm suspension packing material obtained by 3D printing imparts a high degree of complexity to the biological carrier structure and overcomes the limitations of manufacturability in complex designs.

[0055] Example 2

[0056] A biofilm suspension packing material, wherein the biofilm suspension packing material is prepared by the preparation method described in Example 1 above.

[0057] See Figure 2 and 3 This embodiment uses a biofilm suspension packing material. The internal structure of this packing material is smooth and highly interconnected, exhibiting a repeating surface structure at each local point, with an average curvature of 0 at any point. This biofilm suspension packing material is based on a three-period minimum surface (TPMS) design for porous structures. TPMS is an implicit surface with a complete mathematical expression. In this embodiment, adjustments are made by changing parameters (i.e., controlling the TPMS modeling method, topology, relative density of the packing material, radius of the packing material, and cell size of the packing material).

[0058] In this embodiment, the TPMS structure is Gyroid. The implicit functions of this Gyroid are:

[0059]

[0060] See Figure 4 This is a schematic diagram of a unit cell. Where L is the unit cell size, C is the curvature parameter, and x, y, and z are the x-axis, y-axis, and z-axis coordinates in a three-dimensional coordinate system, respectively.

[0061] In this embodiment, the curvature parameter C directly affects the volume ratio of the two segmented spaces, i.e., the relative density; the relative density has a linear relationship with the wall thickness and the reciprocal of the cell size. Therefore, the biofilm suspension packing in this embodiment is prepared by indirectly controlling the curvature parameter by changing the range of the two parameters, cell size and relative density, thereby adjusting the packing structure and obtaining the wall thickness data, and then using the preparation method in Example 1.

[0062] In this specific embodiment, the curvature parameter C has a linear relationship with the relative density RD, i.e., C = (RD + 1.806) / 67.91.

[0063] In this embodiment, the relative density is directly proportional to the wall thickness t and inversely proportional to the cell size L.

[0064] now that:

[0065]

[0066] The biofilm suspension packing in this embodiment increases the effective specific surface area, providing more attachment space for microorganisms, while promoting mass transfer, ensuring stable attachment and growth of the biofilm, and ultimately significantly improving the performance of the MBBR.

[0067] In practical applications, the biofilm suspended packing material in Example 2 is used in the field of water treatment. A hydrophilicity test was conducted on the biofilm suspended packing material in Example 2, and the results are as follows: The Fourier transform infrared spectrum of the biofilm suspended packing material in Example 2 is shown below. Figure 5 As shown. 3300-3700cm -1 The broadband width is related to the stretching vibration of the OH group of the hydroxyl functional group, and the surface filler contains OH functional groups; 2940cm -1 The absorption peak at 1716 cm⁻¹ corresponds to the stretching vibration of CH₄. -1 The sharp absorption peak at 1180 cm⁻¹ -1 1102cm -1 The bimodal surface packing contains esters, ethers, and other groups. Therefore, the biofilm suspension packing in Example 2 has a large number of hydrophilic functional groups, which is beneficial for the attachment and growth of microorganisms.

[0068] In Example 2, the structure of the biofilm suspension packing material is controlled by selecting a combination of parameters such as relative density and cell size, thereby increasing the effective specific surface area to provide more attachment space for microorganisms, promoting mass transfer, ensuring stable attachment and growth of the biofilm suspension packing material, and ultimately significantly improving the performance of the moving bed biofilm reactor.

[0069] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0070] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions.

[0071] It should be noted that any reference numerals placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In claims that enumerate several means, several of these means may be embodied by the same hardware. The use of the terms first, second, third, etc., is merely for convenience of expression and does not indicate any order. These terms can be understood as part of the component names.

[0072] Furthermore, it should be noted that in the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims should be interpreted to include both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0074] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention should also include these modifications and variations.

Claims

1. A method for preparing a biofilm suspension packing material, characterized in that, The method includes: S1. Using Mslattice software, adjust the modeling method, topology, relative density of fillers, radius of fillers, and cell size of fillers in TPMS to output the corresponding filler model. The relative density of the filler satisfies formula (1); wherein, formula (1) is: ； Where RD is the relative density of the filler; L is the cell size; and t is the wall thickness of the filler. The topology of the TPMS is Gyroid; the curvature parameter C in the Gyroid satisfies formula (2); formula (2) is: C = (RD + 1.806) / 67.91; S2. Using a 3D printing device and pre-specified printing material, print according to the packing model to obtain a biofilm suspension packing. This biofilm suspension packing is based on a three-period minimum surface design with a porous structure.

2. The method for preparing the biofilm suspension packing material according to claim 1, characterized in that, The modeling method for TPMS is a patch network modeling method.

3. The method for preparing the biofilm suspension packing material according to claim 1, characterized in that, The radius of the filler is 5-25 mm; The cell size of the filler is 5-25 mm.

4. The method for preparing the biofilm suspension packing material according to claim 3, characterized in that, The relative density of the filler is 15%~50%.

5. The method for preparing the biofilm suspension packing material according to any one of claims 1-4, characterized in that, The parameters of the 3D printing equipment are set as follows: layer thickness 25um-75um; initial exposure 30s-70s; printing exposure 2.5s-7.5s; printing rise height 4mm-12mm; motor speed 1mm / s-10mm / s; lamp-off delay 1s-7s; number of bottom layers exposed 1-4. The pre-specified printing material is photosensitive resin.

6. A biofilm suspension packing material, characterized in that, The biofilm suspension packing is prepared by any one of the preparation methods described in claims 1-5.

7. The application of a biofilm suspension packing material as described in claim 6, characterized in that, Application of the biofilm suspended packing material in the field of water treatment.

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