Microbial carrier for enhancing mass transfer and application thereof

Abstract

The invention belongs to the technical field of industrial water treatment, and particularly relates to a microbial carrier for enhancing mass transfer and application thereof. The microbial carrier for enhancing mass transfer provided by the invention comprises a hydrogel carrier and a microbial stationary phase embedded in the hydrogel carrier, wherein the hydrogel carrier is provided with micro cavities and micro pore channels (communicated pore channels). According to the microbial carrier for enhancing mass transfer, in an up-flow fluidized bed reactor, due to the shear force action of fluid flowing and rising, cavities and pore channels in hydrogel particles form a dynamic fluid channel, periodic'inhalation 'and'exhalation' processes are generated, and an efficient mass transfer environment with a synergistic effect is formed; according to the mass transfer mode similar to pulmonary respiration, the hydrogel carrier in the reactor continuously updates internal reactants and products, so that the activity and metabolic efficiency of microorganisms are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of industrial water treatment, and more particularly relates to a microorganism carrier for mass transfer enhancement and application thereof. BACKGROUND

[0002] The use of microbial metabolic activity to degrade organic pollutants in wastewater has been widely applied in the treatment of municipal domestic sewage and industrial wastewater. Granular sludge, as the basic working unit of biochemical treatment, plays a decisive role in the biological treatment process of wastewater, and directly affects the efficiency and stability of the treatment system.

[0003] Microbial immobilization technology uses chemical or physical means to fix free cells in a defined spatial area, so that they remain active, and thus has unique advantages and is applied in the biological treatment process of wastewater. However, the traditional microbial immobilization carrier has the disadvantages of mass transfer resistance and loss of activity, and maintaining the concentration of microorganisms and enhancing the mass transfer process is of great significance to the biological treatment process of wastewater. SUMMARY

[0004] The purpose of the present application is to provide a microorganism carrier for mass transfer enhancement and application thereof to solve the problems existing in the prior art.

[0005] To achieve the above purpose, the present application provides the following solutions: One of the technical solutions of the present application provides a microorganism carrier for mass transfer enhancement, which comprises a hydrogel carrier and a microbial stationary phase embedded in the hydrogel carrier. The hydrogel carrier has microcavities and micropores (communication channels).

[0006] Further, the hydrogel carrier is obtained by cross-linking reaction using at least one of acrylamide, sodium alginate, chitosan and polyvinyl alcohol as a gel monomer.

[0007] Further, the microbial stationary phase comprises a microbial strain and / or activated sludge.

[0008] Optionally, the microbial strain is a methanogenic microbial strain for anaerobic digestion and / or a functional strain with anaerobic ammonia oxidation, nitrification and denitrification, sulfur autotrophic denitrification, including at least one of ammonia-oxidizing bacteria (AoB), anaerobic ammonia-oxidizing bacteria (AnAoB), nitrifying bacteria (N.B), denitrifying bacteria (DNB) and sulfur autotrophic denitrifying bacteria (SAD).

[0009] Optionally, the activated sludge comprises anaerobic granular sludge (AnGS), aerobic granular sludge (AGS) or anaerobic ammonia-oxidizing granular sludge.

[0010] Further, it further comprises a counterweight component for adjusting the density of the microorganism carrier.

[0011] Optionally, the counterweight component comprises at least one of bentonite, nano-magnetite and elemental sulfur.

[0012] In the present application, the microcavities and micropores are constructed by a template removal method.

[0013] Further, the volume of the microcavities and micropores is 2-5% of the volume of the mass transfer enhanced microbial carrier.

[0014] The mass transfer enhanced microbial carrier provided by the present application contains microcavities and interconnected pores that satisfy the enhanced convective mass transfer. The principle of the structure mass transfer enhancement lies in the volume expansion and contraction of the gas accumulated in the microcavities under the pressure fluctuation environment, the formation of the enhanced convective mass transfer in the interconnected pores to promote liquid exchange, and the increase of the substrate supply for the microorganisms in the carrier.

[0015] The second technical solution of the present application provides a preparation method of the above-mentioned mass transfer enhanced microbial carrier, comprising the following steps: dissolving the gel monomer in water to obtain a first mixed system; adding an equal volume of a microbial stationary phase and a template agent as a precursor of the microcavities and micropores into the first mixed system, mixing uniformly, and performing a cross-linking molding reaction to obtain a gel molding product; performing induced cross-linking and salting-out treatment on the gel molding product to obtain a gel microbial carrier; degrading the template agent in the gel microbial carrier to construct the microcavities and micropores, thereby obtaining the mass transfer enhanced microbial carrier.

[0016] Further, the mass ratio of the gel monomer to water is 1-15:85-99.

[0017] Further, the microbial stationary phase comprises a microbial strain and / or activated sludge.

[0018] Optionally, the microbial strain is an anaerobic digestion methanogenic microbial strain and / or a functional strain with anaerobic ammonia oxidation, nitrification and denitrification, and sulfur autotrophic denitrification, which is added in the form of a dispersion liquid with a concentration of 5%-10% and comprises at least one of ammonia-oxidizing bacteria (AoB), anaerobic ammonia-oxidizing bacteria (AnAoB), nitrifying bacteria (N.B), denitrifying bacteria (DNB) and sulfur autotrophic denitrifying bacteria (SAD).

[0019] Optionally, the activated sludge has a water content of 5%-10% and comprises anaerobic granular sludge (AnGS), aerobic granular sludge (AGS) or anaerobic ammonia-oxidizing granular sludge.

[0020] Further, the template agent is a degradable fiber filament, which comprises at least one of chitin fiber filaments, starch-based fiber filaments and gelatin blended fiber filaments.

[0021] Further, the mass percentage of the template agent in the system after being added is 3-5%.

[0022] Further, the cross-linking forming reaction is freeze-thaw cross-linking or cross-linking by adding a cross-linking agent.

[0023] Optionally, the freeze-thaw cross-linking is under the condition of -4℃ for 12 hours.

[0024] Optionally, the cross-linking agent is ammonium persulfate and N,N'-methylene bisacrylamide.

[0025] Preferably, the concentration of the ammonium persulfate in the system after being added is 0.1wt%, and the concentration of the N,N'-methylene bisacrylamide in the system after being added is 0.01wt%.

[0026] Optionally, in the system after adding the cross-linking agent, the proportion of the gel monomer is 1-15%, the proportion of the cross-linking agent is 0.2-1%, and the proportion of the water is 84-98.8%, based on the sum of the mass of the gel monomer, the cross-linking agent and the water in the system being 100%.

[0027] Further, the step of inducing cross-linking and salt precipitation treatment comprises: dipping the gel forming object in 0.5M sodium sulfate coagulation liquid for 1-2 hours.

[0028] In the application, the structure performance can be further enhanced by inducing cross-linking and salt precipitation treatment. Specifically, sodium sulfate weakens the interaction between polymer molecules and water molecules through the salt precipitation effect, and promotes the further close of the molecular chains. Then, the reconstruction of the inter-chain hydrogen bond enhances the interaction between the polymers, thereby significantly improving the mechanical strength of the hydrogel.

[0029] Further, the first mixed system further comprises a counterweight component, which adjusts the density of the mass transfer enhanced microbial carrier.

[0030] The density of the mass transfer enhanced microbial carrier (1.1-1.3 g / cm 3 ) is adjusted by the counterweight component, so as to ensure that the carrier forms a fluidized state in the industrial wastewater treatment biochemical tower.

[0031] The third technical scheme of the application provides an application of the above-mentioned mass transfer enhanced microbial carrier in sewage treatment.

[0032] The mass transfer enhanced microbial carrier provided by the application forms a dynamic fluid passage through the internal unique cavities and channels, and generates a periodic "inhale" and "exhale" process, thereby forming a high-efficiency and synergistic mass transfer environment.

[0033] The present invention discloses the following technical effects: The enhanced mass transfer principle of the microbial carrier with enhanced mass transfer provided by the present invention lies in the volume expansion and contraction of the gas accumulated in the microcavity under pressure fluctuation environment, which forms enhanced convective mass transfer in the connecting channels, promotes liquid exchange, and increases the substrate supply for microorganisms inside the carrier.

[0034] The enhanced mass transfer microbial carrier provided by this invention has a unique cavity structure and interconnected channels that can significantly promote the mass transfer process. In an upflow fluidized bed reactor (a tower reactor with a height-to-diameter ratio of not less than 3) used for wastewater treatment, due to the fluid flow and the shear force of the rise, the cavities and channels inside these hydrogel particles form dynamic fluid pathways, generating periodic "inhalation" and "exhalation" processes, forming a highly efficient and synergistic mass transfer environment. This mass transfer mode, similar to "lung respiration," allows the hydrogel carrier in the reactor to continuously renew the reactants and products inside, thereby significantly improving the activity and metabolic efficiency of microorganisms. Attached Figure Description

[0035] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a comparison of the ammonia nitrogen removal rates of the microbial carriers in Example 1 and Comparative Example 1.

[0036] Figure 2 The slope of the carrier and the ordinary carrier are used to enhance mass transfer. Detailed Implementation

[0037] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0038] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0039] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0040] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0041] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0042] Unless otherwise specified, all raw materials and reagents involved in the specific embodiments of this invention are commercially available products.

[0043] Unless otherwise specified, room temperature and ambient temperature in the specific embodiments of this invention refer to 20-30℃.

[0044] It should be noted that any aspects not described in detail in this invention are conventional practices in the field and are not the focus of this invention.

[0045] Unless otherwise specified, the term "parts" in the specific embodiments of this invention refers to "parts by mass".

[0046] The strains involved in the specific embodiments of this invention are all commercially available strains.

[0047] The composition parameters of the simulated wastewater involved in the specific implementation of the present invention are as follows: NHCl 4200 mg / L, NaNO2 240 mg / L, NaHCO3 1.2 g / L, KH2PO4 0.1 g / L, CaCl2·2H2O 0.01 g / L, MgSO4·7H2O 0.04 g / L.

[0048] Example 1 The preparation steps of the enhanced mass transfer microbial carrier include: S1. Add 10 parts of polyvinyl alcohol to 100 parts of water and dissolve them completely at 90°C for 2 hours. After dissolving, cool to 40°C and add 1 part of sodium alginate. Dissolve for 1 hour to obtain the first mixed system. S2. Add an equal volume of bacterial solution (10%, anaerobic ammonia-oxidizing granular bacterial solution) to the first mixed system, mix evenly, then add chitin fiber filaments as precursors for microcavities and connecting channels, so that its mass percentage in the system is 5%, and stir vigorously (2500 rpm) to disperse it evenly to obtain the second mixed system. S3. Pour the second mixture into a 1.5cm×1.5cm×1.5cm grid mold and react at a low temperature of -4℃ for 12 hours to obtain a gel-shaped product; S4. The gel-shaped material was immersed in 0.5M sodium sulfate coagulation solution (2h) to further enhance its structural properties and obtain a gel microbial carrier. S5. The gel microbial carrier was run in simulated wastewater for one week to achieve the autonomous degradation of chitin fibers, forming microcavities and micropores, thus obtaining a microbial carrier with enhanced mass transfer.

[0049] In this embodiment, the volume ratio of microcavities and micropores in the enhanced mass transfer microbial carrier is about 2%.

[0050] The chitin fiber filaments used in this embodiment have a relatively high density, an interwoven network structure, and good biodegradability. During operation in simulated wastewater, the chitin fiber filaments are degraded by microorganisms and form interwoven network structure channels inside the carrier, and microcavities are formed at the dense intersection of channels.

[0051] Example 2 The preparation steps of the enhanced mass transfer microbial carrier include: S1. Add 10 parts acrylamide to 100 parts water and dissolve it completely at 50°C for 1 hour. After dissolving, cool to 40°C and add 1 part chitosan. Dissolve for 1 hour to obtain the first mixed system. S2. Add an equal volume of bacterial solution (10%, anaerobic ammonia-oxidizing granular bacterial solution) to the first mixed system, mix evenly, then add chitin fiber filaments as precursors for microcavities and connecting channels, so that its mass percentage in the system is 5%, and stir vigorously (2500 rpm) to disperse it evenly to obtain the second mixed system. S3. Add crosslinking agents: ammonium persulfate and N,N'-methylenebisacrylamide to the second mixture to obtain the third mixture. The concentration of ammonium persulfate in the system after addition is 0.1 wt%, and the concentration of N,N'-methylenebisacrylamide in the system after addition is 0.01 wt%. S4. Pour the third mixture into a 1.5cm×1.5cm×1.5cm grid mold and react at 40℃ for 3 hours to obtain a gel-shaped product; S5. Immerse the gel-shaped material in a 0.5M calcium chloride solution (2h) to further enhance its structural properties and obtain a gel microbial carrier. S6. The gel microbial carrier was run in simulated wastewater for one week to achieve the autonomous degradation of chitin fibers, forming microcavities and microchannels, thus obtaining a microbial carrier with enhanced mass transfer.

[0052] In this embodiment, the volume ratio of microcavities and micropores in the enhanced mass transfer microbial carrier is about 2%.

[0053] Example 3 The preparation steps of the enhanced mass transfer microbial carrier include: S1. Add 10 parts of polyvinyl alcohol to 100 parts of water and dissolve them completely at 90°C for 2 hours. After dissolving, cool to 40°C and add 1 part of sodium alginate. Dissolve for 1 hour to obtain the first mixed system. S2. Add an equal volume of activated sludge (10%, anaerobic ammonifying bacteria) to the first mixing system, mix evenly, then add chitin fiber filaments as precursors for microcavities and connecting channels, so that its mass percentage in the system is 5%, and stir vigorously (2500 rpm) to disperse it evenly to obtain the second mixing system. S3. Pour the second mixture into a 1.5cm×1.5cm×1.5cm grid mold and react at a low temperature of -4℃ for 12 hours to obtain a gel-shaped product; S4. The gel-shaped material was immersed in 0.5M sodium sulfate coagulation solution (2h) to further enhance its structural properties and obtain a gel microbial carrier. S5. The gel microbial carrier was run in simulated wastewater for one week to achieve the autonomous degradation of chitin fibers, forming microcavities and micropores, thus obtaining a microbial carrier with enhanced mass transfer.

[0054] In this embodiment, the volume ratio of micro-walls and micropores in the enhanced mass transfer microbial carrier is about 2%.

[0055] Example 4 The preparation steps of the enhanced mass transfer microbial carrier include: S1. Add 10 parts of polyvinyl alcohol to 100 parts of water and dissolve them completely at 90°C for 2 hours. After dissolving, cool to 40°C and add 1 part of sodium alginate and 1 part of nano iron oxide. Dissolve for 1 hour to obtain the first mixed system. S2. Add an equal volume of activated sludge (10%, anaerobic ammonifying bacteria) to the first mixing system, mix evenly, then add chitin fiber filaments as precursors for microcavities and connecting channels, so that its mass percentage in the system is 5%, and stir vigorously (2500 rpm) to disperse it evenly to obtain the second mixing system. S3. Pour the second mixture into a 1.5cm×1.5cm×1.5cm grid mold and react at a low temperature of -4℃ for 12 hours to obtain a gel-shaped product; S4. The gel-shaped material was immersed in 0.5M sodium sulfate coagulation solution (2h) to further enhance its structural properties and obtain a gel microbial carrier. S5. The gel microbial carrier was run in simulated wastewater for one week to achieve the autonomous degradation of chitin fibers, forming microcavities and micropores, thus obtaining a microbial carrier with enhanced mass transfer.

[0056] In this embodiment, the volume ratio of micro-walls and micropores in the enhanced mass transfer microbial carrier is about 2%.

[0057] Example 4 is a scheme with added compounding components. In order to further clarify the density change after addition, based on Example 4, without adding compounding components, its density was tested and calculated, and the results are shown in Table 1.

[0058] Table 1 Comparative Example 1 The preparation steps of ordinary microbial carriers without microcavities and microchannels include: S1. Add 10 parts of polyvinyl alcohol to 100 parts of water and dissolve them completely at 90°C for 2 hours. After dissolving, cool to 40°C and add 1 part of sodium alginate. Dissolve for 1 hour to obtain the first mixed system. S2. Add an equal volume of bacterial solution (10%, anaerobic ammonia oxidation granules) to the first mixed system, mix well, and obtain the second mixed system; S3. Pour the second mixture into a 1.5cm×1.5cm×1.5cm grid mold and react at a low temperature of -4℃ for 12 hours to obtain a gel-shaped product; S4. Immerse the gel-shaped material in 0.5M sodium sulfate coagulation solution (2h) to further enhance its structural properties and obtain a gel microbial carrier, which is a common microbial carrier without microcavities and micropores.

[0059] Test case The following describes the performance test of the microbial carriers prepared in Example 1 and Comparative Example 1 for pollutant removal, as an example: A simulated ammonia nitrogen wastewater with an initial concentration of 200 mg / L was prepared. The specific formula is shown in Table 2. The added microbial carrier was used to conduct a biological denitrification experiment under the condition of a solid-liquid ratio of 1:3 (reaction column, carrier occupies 25% of the volume).

[0060] Table 2 After the experiment, the ammonia nitrogen removal rate of the simulated ammonia nitrogen wastewater was calculated, and the results are as follows: Figure 1 As shown, the calculation method is as shown in equation (1): η=(C0-C e ) / C0×100% (1; In equation (1), η is the ammonia nitrogen removal rate (%), C0 is the simulated ammonia nitrogen wastewater concentration before treatment (mg / L); C e The simulated ammonia nitrogen concentration in the treated wastewater is in mg / L.

[0061] Figure 1 This figure compares the ammonia nitrogen removal rates of the microbial carriers used in Example 1 (enhanced mass transfer carrier) and Comparative Example 1 (ordinary carrier). As can be seen from the figure, the ammonia nitrogen removal rate of the microbial carrier in Example 1 is higher. After 24 hours of denitrification experiment, the ammonia nitrogen concentration using the microbial carrier in Example 1 was 21.2 mg / L, with a removal rate reaching 89.5%, which is 30% higher than that of the microbial carrier in Comparative Example 1.

[0062] To further highlight the enhancing effect of microcavities and microchannels on mass transfer, the mass transfer coefficients of the enhanced mass transfer carrier and the ordinary carrier were calculated. The calculation method is shown in Equation (2): (2); In equation (2), D e The mass transfer coefficient, expressed in cm, represents the effective mass transfer coefficient of molecules into the carrier. 2 / s; C0 is the initial concentration of ammonia nitrogen, mg N / L; C ∞ The final ammonia nitrogen concentration in the solution is denoted as mg N / L, which is the ammonia nitrogen concentration in the solution 24 hours after biological denitrification, at which point it is assumed that the ammonia nitrogen concentration in the solution no longer changes; R is the radius of the square carrier, in cm; C t See Figure 2 The x-coordinate of each point, mg N / L.

[0063] According to Equation 2, the slope (k) = (π) 2 D e ) / R 2 Then the mass transfer coefficient D e =( kπ 2 ) / R 2 The slopes of the enhanced mass transfer carrier and the ordinary carrier are as follows: Figure 2 As shown. The calculated mass transfer coefficient of the enhanced mass transfer microbial carrier (Example 1) is 0.203 cm⁻¹. 2 / s, the mass transfer coefficient of the ordinary carrier (Comparative Example 1) is 0.188 cm⁻¹. 2 / s, the mass transfer coefficient of the enhanced mass transfer carrier is significantly higher than that of the ordinary carrier.

[0064] Ordinary solid hydrogels typically have a dense structure and lack effective channels and cavities. The mass transfer process mainly relies on diffusion in the external liquid phase. Oxygen, nutrients, and reaction substrates require a long time to penetrate into the internal area of ​​the hydrogel, resulting in a slow mass transfer rate. In contrast, functional hydrogel carriers with cavity structures and interconnected channels significantly enhance the mass transfer process through their unique "lung breathing effect," providing space for the rapid transfer of reactants and metabolites. Using these functional hydrogels as biological carriers significantly improves mass transfer efficiency compared to ordinary solid hydrogels, increasing the amount of pollutants removed per unit time by 30%.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A microbial carrier for enhanced mass transfer, characterized in that, The microbial carrier includes a hydrogel carrier and a microbial stationary phase embedded in the hydrogel carrier; The hydrogel carrier has microcavities and micropores.

2. The enhanced mass transfer microbial carrier as described in claim 1, characterized in that, The hydrogel carrier is obtained by cross-linking reaction using at least one of acrylamide, sodium alginate, chitosan and polyvinyl alcohol as gel monomers; And / or, the microbial stationary phase includes microbial strains and / or activated sludge; And / or, the volume of the microcavities and microchannels is 2-5% of the volume of the enhanced mass transfer microbial carrier; And / or, may also include a compounding component for adjusting the density of the microbial carrier.

3. The enhanced mass transfer microbial carrier as described in claim 2, characterized in that, The microbial strains are anaerobic digestive methanogenic microorganisms and / or functional bacteria with anaerobic ammonia oxidation, nitrification-denitrification, and sulfur autotrophic denitrification.

4. A method for preparing a microbial carrier with enhanced mass transfer as described in claim 1, characterized in that the step... include: The gel monomer was dissolved in water to obtain the first mixed system; An equal volume of microbial stationary phase and a template agent serving as precursors for microcavities and micropores were added to the first mixing system, mixed evenly, and then subjected to a cross-linking molding reaction to obtain a gel-shaped product. The gel-shaped material was subjected to induced cross-linking and salting-out treatment to obtain a gel microbial carrier; The template agent in the gel microbial carrier is degraded to construct microcavities and micropores, thereby obtaining the enhanced mass transfer microbial carrier.

5. The preparation method according to claim 4, characterized in that, The mass ratio of the gel monomer to water is 1-15:85-99; And / or, the microbial stationary phase includes microbial strains and / or activated sludge; And / or, the template agent is a biodegradable fiber; And / or, the template agent, after being added, constitutes 3-5% by mass in the system; And / or, the crosslinking molding reaction is freeze-thaw crosslinking or crosslinking with the addition of a crosslinking agent; And / or, the steps of induced crosslinking and salting out include: immersing the gel-shaped material in a 0.5M sodium sulfate coagulation solution for 1-2 h; And / or, may also include adding a recombinant component to the first mixing system to adjust the density of the enhanced mass transfer microbial carrier.

6. The preparation method according to claim 5, characterized in that, The microbial strain was added in the form of a dispersion at a concentration of 5-10%. And / or, the activated sludge has a moisture content of 5-10%.

7. The preparation method according to claim 5, characterized in that, The freeze-thaw crosslinking is carried out by reacting at -4°C for 12 hours.

8. The preparation method according to claim 5, characterized in that, The crosslinking agent is ammonium persulfate and N,N'-methylenebisacrylamide.

9. The preparation method according to claim 5, characterized in that, In the system after the addition of the crosslinking agent, based on the sum of the mass of gel monomer, crosslinking agent and water in the system being 100%, the proportion of gel monomer is 1-15%, the proportion of crosslinking agent is 0.2-1%, and the proportion of water is 84-98.8%.

10. The application of the enhanced mass transfer microbial carrier as described in claim 1 in wastewater treatment.

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