System and method for accelerating mineralization of CO2 in underground water by using microorganisms

Abstract

The invention provides a system for accelerating mineralization of CO2 in underground water by using microorganisms. The system comprises a supercritical fluid injection module, a compression module and a microorganism injection module, the supercritical fluid injection module is used for injecting supercritical CO2 fluid into an underground water system and comprises a heat preservation water guide pipe embedded in an injection area stratum. The compression module is connected with the supercritical fluid injection module and is used for applying injection pressure to the supercritical CO2 fluid; the microorganism injection module is used for injecting CO2 mineralization microorganisms into the underground water system; the microorganism injection module comprises a plurality of microorganism bacterium agent conveying pipes, the multiple microorganism bacterium agent conveying pipes are arranged in the heat preservation water guide pipe in a sleeved mode, and a supercritical CO2 fluid flow channel is formed between the inner wall of the heat preservation water guide pipe and the outer walls of the microorganism bacterium agent conveying pipes. And the dissolution and mineralization process of CO2 can be obviously accelerated by the metabolic activity of the microorganisms for CO2 mineralization, so that the sealing efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon sequestration, and specifically relates to a system and method for accelerating the mineralization of CO2 in groundwater by utilizing microorganisms. Background Art

[0002] With the acceleration of industrialization, the concentration of CO2 in the atmosphere continues to rise, leading to rising global temperatures and increasingly serious climate change issues. As one of the important means to mitigate climate change, CCS technology focuses on capturing CO2 produced in industrial production or energy production and storing it deep underground, such as depleted oil and gas fields, saline layers, etc. However, traditional storage methods have problems such as slow CO2 dissolution rate and poor stability, which affect the storage effect. CO2 dissolves in underground salt water and reacts with minerals in rocks to form stable carbonate minerals. Studies have shown that certain microorganisms can accelerate the mineralization process of CO2 under certain conditions, converting CO2 into stable carbonate minerals, thereby permanently storing CO2 in the form of rocks. However, the existing technology lacks microorganisms with efficient mineralization capabilities and corresponding treatment methods, which urgently need to be improved. Summary of the invention

[0003] In view of the defects and shortcomings of the prior art, the purpose of the present invention is to provide a system and method for accelerating the mineralization of CO2 in groundwater using microorganisms. The method can screen and cultivate microorganisms with efficient mineralization capabilities, inject the obtained microorganisms into the ground together with CO2, and use the metabolic activities of the microorganisms to accelerate the dissolution and mineralization of CO2, thereby achieving long-term and stable storage of CO2.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A system for accelerating the mineralization of CO2 in groundwater using microorganisms, comprising a supercritical fluid injection module, a compression module and a microbial injection module;

[0006] The supercritical fluid injection module is used to inject supercritical CO2 fluid into the groundwater system, and the supercritical fluid injection module includes a heat-insulating water pipe buried in the stratum of the injection area;

[0007] The compression module is connected to the supercritical fluid injection module and is used to apply injection pressure to the supercritical CO2 fluid;

[0008] The microbial injection module is used to inject CO2 mineralization microorganisms into the groundwater system;

[0009] The microbial injection module comprises a plurality of microbial agent delivery pipes, which are all sleeved in the thermal insulation water pipe, and a supercritical CO2 fluid flow channel is formed between the inner wall of the thermal insulation water pipe and the outer wall of the microbial agent delivery pipe.

[0010] The present invention also has the following technical features:

[0011] Specifically, the supercritical fluid injection module also includes a supercritical fluid storage tank, the compression module includes a compressor for compressing the supercritical fluid, and the supercritical fluid storage tank is connected to the compressor; the supercritical fluid storage tank is connected to a supercritical fluid injection pipe, and the supercritical fluid injection pipe is connected to the thermal insulation water pipe for transporting CO2 fluid into the supercritical CO2 fluid flow channel.

[0012] Furthermore, the thermal insulation water pipe includes an outer tube and an inner tube which are coaxially sleeved, and a receiving cavity is formed between the outer tube and the inner tube. A plurality of heat exchange tubes are arranged in the receiving cavity, and the water inlet and outlet of the heat exchange tubes are respectively connected to the water inlet pipe and the water outlet pipe arranged on the ground.

[0013] Furthermore, the microbial injection module also includes a microbial storage tank for CO2 mineralization, and the microbial storage tank for CO2 mineralization is connected to the microbial agent delivery pipe through a pipeline.

[0014] Furthermore, the inner radius of the microbial agent delivery pipe and the inner radius of the inner pipe satisfy the following relationship:

[0015]

[0016] in:

[0017] r is the inner radius of the microbial agent delivery pipe, in m;

[0018] R is the inner radius of the inner tube, in m.

[0019] The present invention also protects a method for accelerating the mineralization of CO2 in groundwater using microorganisms, which is implemented by the above-mentioned system for accelerating the mineralization of CO2 in groundwater using microorganisms, including injecting purified and compressed CO2 into the groundwater system by supercritical fluid injection, and injecting the cultivated CO2 mineralizing microorganisms into the groundwater system;

[0020] The CO2 mineralization microorganism is a compound of carbonic anhydrase producing bacteria, sulfate reducing bacteria, iron reducing bacteria and urea decomposing bacteria.

[0021] Furthermore, in the CO2 mineralization microorganisms, the mass ratio of carbonic anhydrase producing bacteria, sulfate reducing bacteria, iron reducing bacteria and urea decomposing bacteria is: (5.0-6.0):(3.0-4.0):(0.5-1.0):(1.0-2.0).

[0022] Preferably, the carbonic anhydrase-producing bacteria are selected from one or more of Pasteurella mitis, Bacillus licheniformis, Bacillus mucilaginosus, Methanobacterium thermophilum, and Pyrococcus hallii; the sulfate-reducing bacteria are selected from one or more of the genera Sulfovibrio, Desulfomonas, Desulfolobus, Desulfur Enterobacter, Desulfobacterium, Desulfococcus, Desulfosarcina, and Desulfuromyces; the iron-reducing bacteria are selected from one or more of the genera Thermotogales and Thermoanaerobacteriales, and the urea-decomposing bacteria are selected from one or more of Ureabacillus pastoris, Helicobacter pylori, Mycoplasma, Uric acid bacteria, Proteus, Salmonella, and Staphylococcus.

[0023] Furthermore, the injection parameters of the supercritical fluid injection include: an injection temperature of 50 to 80° C. and an injection pressure of 5 to 10 MPa.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] (1) The present invention uses microbial agents to accelerate the mineralization of CO2 in groundwater. The metabolic activities of CO2 mineralizing microorganisms can significantly accelerate the dissolution and mineralization process of CO2 and improve the storage efficiency. The formed carbonate minerals are highly stable and can store CO2 for a long time to prevent it from being released back into the atmosphere. The method of the present invention utilizes the natural metabolic process of microorganisms and does not require the addition of additional chemicals, thereby reducing potential pollution to the environment.

[0026] (2) The method of the present invention is relatively simple and low-cost, and can effectively reduce the overall economic cost of CCS technology.

[0027] (3) The system provided by the present invention for accelerating the mineralization of CO2 in groundwater by microorganisms has a simple structure, and the use of an insulated water pipe can ensure the temperature stability of the microorganisms during the transportation process; the multiple microbial agent delivery pipes coaxially arranged in the insulated water pipe can ensure that the microorganisms used for CO2 mineralization are evenly distributed to the target groundwater layer, thereby improving the uniformity and efficiency of the mineralization reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a top view of the local structure of the system of the present invention in Example 1;

[0029] Figure 2 This is a schematic diagram of the structure of the thermal insulation water pipe;

[0030] Figure 3This is the laboratory simulation experiment result of Example 2.

[0031] The symbols in the accompanying drawings indicate:

[0032] 1-heat-insulating water pipe, 2-microorganism agent delivery pipe, 11-outer pipe, 12-inner pipe, 13-heat exchange pipe.

[0033] The technical solution of the present invention is further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0034] It should be noted that, unless otherwise specified, all devices and components used in the present invention are devices and components known in the art.

[0035] The technical concept of the present invention is to select CO2 mineralization microorganisms that are resistant to high temperature, high pressure and high salinity conditions from nature, and improve the reproduction rate and mineralization activity of microorganisms by optimizing the culture to obtain a high-concentration microbial bacterial solution. According to the specific geological conditions of the target reservoir, the injection parameters (such as temperature, pressure, salinity, CO2 mineralization microorganism content, etc.) are adjusted to create an environment most suitable for microbial growth and CO2 mineralization. The CO2 fluid is injected into the groundwater system by supercritical fluid injection, and CO2 mineralization microorganisms are injected at the same time to promote full contact and reaction between CO2 and groundwater; under the action of microorganisms, CO2 reacts with calcium ions (or other metal cations) in the groundwater to form stable carbonate precipitation; microorganisms change the local microenvironment through their metabolic activities, create physical and chemical conditions conducive to mineral precipitation, and accelerate the mineralization reaction.

[0036] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0037] Example 1

[0038] Following the above technical solution, Figure 1 and Figure 2 As shown, this embodiment provides a system for accelerating the mineralization of CO2 in groundwater using microorganisms, including a supercritical fluid injection module, a compression module and a microorganism injection module;

[0039] The supercritical fluid injection module is used to inject supercritical CO2 fluid into the groundwater system, and the supercritical fluid injection module includes a heat-insulating water pipe 1 buried in the stratum of the injection area;

[0040] The compression module is connected to the supercritical fluid injection module and is used to apply injection pressure to the supercritical CO2 fluid;

[0041] The microbial injection module is used to inject CO2 mineralization microorganisms into the groundwater system;

[0042] The microbial injection module includes a plurality of microbial agent delivery pipes 2, which are all sleeved in the thermal insulation water pipe 1, and a supercritical CO2 fluid flow channel is formed between the inner wall of the thermal insulation water pipe 1 and the outer wall of the microbial agent delivery pipe 2.

[0043] The function of the heat-insulating water pipe 1 is to ensure the temperature stability of the CO2 mineralizing microorganisms during the transportation process.

[0044] In this embodiment, Figure 1 As shown, four microbial agent delivery pipes 2 are arranged in the heat-insulating water pipe 1, and the side walls of adjacent microbial agent delivery pipes 2 are arranged in abutment with each other. That is, CO2 is injected by means of the supercritical CO2 fluid flow path, and CO2 mineralization microorganisms are injected through multiple microbial agent delivery pipes. Such an arrangement can ensure that CO2 mineralization microorganisms are evenly distributed in the target groundwater layer, thereby improving the uniformity and efficiency of the mineralization reaction.

[0045] Preferably, the inner wall of the microbial agent delivery tube 2 is made of biocompatible material to reduce the friction between the microorganisms and the microbial agent delivery tube 2. The biocompatible material is a non-toxic, stable, biologically inert material that is easy to process and form, including polymer materials such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), metal materials such as stainless steel and titanium alloy, ceramic materials such as alumina ceramics and silicon nitride ceramics, composite materials such as carbon fiber and glass fiber, and metal materials are preferred.

[0046] As a preferred solution of this embodiment, the supercritical fluid injection module also includes a supercritical fluid storage tank, the compression module includes a compressor for compressing the supercritical fluid, the supercritical fluid storage tank is connected to the compressor, the supercritical fluid storage tank is connected to a supercritical fluid injection pipe, and the supercritical fluid injection pipe is connected to the thermal insulation water pipe 1 for transporting CO2 fluid into the supercritical CO2 fluid flow channel.

[0047] As a preferred solution of this embodiment, the thermal insulation water pipe 1 includes an outer tube 11 and an inner tube 12 which are coaxially sleeved, and a receiving cavity is formed between the outer tube 11 and the inner tube 12. A plurality of heat exchange tubes 13 are arranged in the receiving cavity at equal intervals along the circumference of the thermal insulation water pipe 1. The heat exchange tubes 13 are detachably installed in the receiving cavity, and the water inlet and outlet of each heat exchange tube 13 face upward and are respectively connected to the water inlet pipe and the water outlet pipe arranged on the ground.

[0048] As a preferred embodiment, assuming that the diameter of the heat exchange tube 13 is a, then

[0049] In this embodiment, the heat exchange tube 13 is a U-shaped tube. Under the action of a water pump, the insulation fluid is injected from the ground into the water inlet of the U-shaped tube and then flows out from the water outlet of the U-shaped tube. The function of the insulation liquid is to provide the microorganisms in the microbial agent delivery pipe 2 with the temperature required for activity.

[0050] As a preferred solution of this embodiment, the microorganism injection module includes a microorganism storage tank for CO2 mineralization, and the microorganism storage tank for CO2 mineralization is connected to the microorganism agent delivery pipe 2 through a pipeline.

[0051] As a preferred solution of this embodiment, the inner radius of the microbial agent delivery pipe 2 and the inner radius of the thermal insulation water pipe 1 satisfy the following relationship:

[0052]

[0053] r is the inner radius of the microbial agent delivery pipe, in m;

[0054] R is the inner radius of the inner tube, in m.

[0055] Example 2

[0056] This embodiment discloses a method for accelerating the mineralization of CO2 in groundwater using microorganisms, which is achieved through the system for accelerating the mineralization of CO2 in groundwater using microorganisms provided in Example 1, including injecting purified and compressed CO2 into the groundwater system by supercritical fluid injection, and injecting cultured CO2 mineralizing microorganisms into the groundwater system at the same time; the CO2 mineralizing microorganisms are composed of a compound of carbonic anhydrase-producing bacteria, sulfate-reducing bacteria, iron-reducing bacteria and urea-decomposing bacteria.

[0057] In this embodiment, carbonic anhydrase-producing bacteria, sulfate-reducing bacteria, iron-reducing bacteria and urea-decomposing bacteria can all be cultured and domesticated by a three-stage culture and domestication method, wherein the preparation method of the first-stage culture and domestication solution is as follows: 1.0-3.0 g / L of peptone, 2.0-4.0 g / L of beef extract, 4.0-7.0 g / L of glucose, and a small amount of inorganic salts, the salt content is adjusted to 0.05-0.5%, mixed evenly, added with sterile water to dissolve, and the pH is adjusted to 7-9 (during the domestication process, the pH value needs to be monitored and adjusted to keep it at 7-9 required for microbial growth), the culture solution temperature is 20-30° C., the dissolved oxygen content is not less than 10 mg / L, the use concentration is 99% CO2 pressurization, pressurization 0.1-0.5 MPa, no light, and different microorganisms are co-cultured; culture process: after the autoclave is heated to 20-30° C., the pressurization system is turned on, and a concentration of 99% is injected into the autoclave. CO2 gas is added to raise the system pressure to 0.1-0.5 MPa, and the timing starts; the cultivation and acclimatization time is 15-30 days. Water quality testing is performed once a day to ensure that the various conditions required for microbial acclimatization meet the requirements and the operation process meets the aseptic conditions to avoid the introduction of miscellaneous bacteria.

[0058] The preparation method of the secondary culture taming solution is as follows: take 1.0-3.0g / L of peptone, 2.0-4.0g / L of beef extract, 4.0-7.0g / L of glucose, and a small amount of inorganic salt, adjust the salt content to 0.5-1.8%, mix evenly, add sterile water to dissolve, adjust the pH to 7-9, the culture solution temperature to 30-50°C, the dissolved oxygen content is not less than 5mg / L, and the concentration is 99% CO2 pressurized, pressurized to 1-5MPa, without light, to improve the tolerance of microorganisms, the reproduction rate of microorganisms and the mineralization activity; culture process: after the autoclave continues to heat up to 30-50°C, open the pressurization system, inject 99% CO2 gas into the autoclave, increase the system pressure to 1-5MPa, and start timing; the culture taming time is 10-15 days. Perform water quality testing once a day to ensure that the various conditions required for microbial taming meet the requirements and the operation process meets the aseptic conditions to avoid the introduction of miscellaneous bacteria.

[0059] The preparation method of the three-level culture taming solution is as follows: take 1.0-3.0g / L of peptone, 2.0-4.0g / L of beef extract, 4.0-7.0g / L of glucose, and a small amount of inorganic salt, adjust the salt content to 1.8-3.0%, mix evenly, add sterile water to dissolve, adjust the pH to 7-9, the culture solution temperature is 50-80°C, oxygen-free or the dissolved oxygen content is less than 5mg / L, use a concentration of 99% CO2 pressurization, pressurize 5-10MPa, no light, to simulate the actual conditions of groundwater; culture process: after the autoclave continues to heat up to 50-80°C, open the pressurization system, inject 99% CO2 gas into the autoclave, increase the system pressure to 5-10MPa, and start timing; the culture taming time is 10-15 days. Perform water quality testing once a day to ensure that the various conditions required for microbial taming meet the requirements and the operation process meets the aseptic conditions to avoid the introduction of miscellaneous bacteria.

[0060] Furthermore, in the CO2 mineralization microorganisms, the mass ratio of carbonic anhydrase producing bacteria, sulfate reducing bacteria, iron reducing bacteria and urea decomposing bacteria is: (5.0-6.0):(3.0-4.0):(0.5-1.0):(1.0-2.0).

[0061] Preferably, the carbonic anhydrase-producing bacteria are selected from one or more of Pasteurella mitis, Bacillus licheniformis, Bacillus mucilaginosus, Methanobacterium thermophilum, and Pyrococcus hallii; the sulfate-reducing bacteria are selected from one or more of the genera Sulfovibrio, Desulfomonas, Desulfolobus, Desulfur Enterobacter, Desulfobacterium, Desulfococcus, Desulfosarcina, and Desulfuromyces; the iron-reducing bacteria are selected from one or more of the genera Thermotogales and Thermoanaerobacteriales, and the urea-decomposing bacteria are selected from one or more of Ureabacillus pastoris, Helicobacter pylori, Mycoplasma, Uric acid bacteria, Proteus, Salmonella, and Staphylococcus.

[0062] Furthermore, the injection parameters of the supercritical fluid injection include: an injection temperature of 50 to 80° C., using CO2 pressurization, and a pressure of 5 to 10 MPa.

[0063] As a preference, after the injection, the CO2 mineralizing microorganism content in the experimental group was 2.0×10 6 ~2.5×10 8 CFU / L.

[0064] Application Examples

[0065] In this application example, the system disclosed in Example 1 and the method disclosed in Example 2 were used to conduct a simulation experiment of injecting CO2 into an underground saline aquifer in the laboratory, and the concentration changes of HCO3- (bicarbonate ions) in the water layer at different time points were detected, with the unit of mg / L. The simulation experiment was conducted in a high-pressure reactor, and the background value of the water body used in the experiment was a bicarbonate ion concentration of 100 mg / L. Among them, the "blank group" is a pressurized water-rich body (CO2 concentration of 80-99%) without the addition of mineralizing microorganisms, which reflects the degree of CO2 mineralization under normal conditions. The "experimental group" is a pressurized water-rich body (CO2 concentration of 80-99%) with the addition of microorganisms to accelerate the mineralization of CO2, which reflects the change in the degree of CO2 mineralization when the mineralizing microorganisms selected by the present invention are added. The microorganisms added in this application example are: carbonic anhydrase-producing bacteria are compounded by Bacillus licheniformis and Bacillus mucilaginosus in a mass ratio of 1:1; sulfate-reducing bacteria are compounded by Desulfovibrio and Desulfur Enterobacter in a mass ratio of 1:1; iron-reducing bacteria are compounded by Thermotogales and Thermoanaerobacteriales in a mass ratio of 1:1; urea-decomposing bacteria are compounded by Ureaplasma pasteurii Proteus in a mass ratio of 1:1. The mass ratio of carbonic anhydrase-producing bacteria, sulfate-reducing bacteria, iron-reducing bacteria and urea-decomposing bacteria is 5.0:3.5:0.6:1, and the injection parameters of supercritical injection include: injection temperature of 60°C and injection pressure of 5MPa.

[0066] The final test results are as follows Figure 3 As shown in the figure, it can be seen that: HCO3 in the blank group - The concentration changes are relatively gentle, reflecting the slow rate of CO2 mineralization under natural conditions. - The concentration changes were significant, indicating that the added microorganisms promoted the mineralization process of CO2, resulting in HCO3 - Concentration increased.

[0067] By comparing the two sets of data, the effect of the method used in this patent on CO2 mineralization can be evaluated. - The concentration was significantly higher than that of the blank group, indicating that the method used in this patent effectively promoted the mineralization of CO2.

[0068] In summary, the present invention uses microbial agents to accelerate the mineralization of CO2 in groundwater. The metabolic activities of CO2 mineralizing microorganisms can significantly accelerate the dissolution and mineralization process of CO2 and improve the storage efficiency. The formed carbonate minerals are highly stable and can store CO2 for a long time to prevent it from being released back into the atmosphere. The method of the present invention utilizes the natural metabolic process of microorganisms and does not require the addition of additional chemicals, thereby reducing potential pollution to the environment.

[0069] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0070] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A system for accelerating the mineralization of CO2 in groundwater using microorganisms, characterized in that: It includes a supercritical fluid injection module, a compression module and a microorganism injection module; The supercritical fluid injection module is used to inject supercritical CO2 fluid into the groundwater system, and the supercritical fluid injection module includes a heat-insulating water pipe (1) buried in the stratum of the injection area; The compression module is connected to the supercritical fluid injection module and is used to apply injection pressure to the supercritical CO2 fluid; The microbial injection module is used to inject CO2 mineralization microorganisms into the groundwater system; The microbial injection module comprises a plurality of microbial agent delivery pipes (2), wherein the plurality of microbial agent delivery pipes (2) are all sleeved in the thermal insulation water pipe (1), and a supercritical CO2 fluid flow channel is formed between the inner wall of the thermal insulation water pipe (1) and the outer wall of the microbial agent delivery pipe (2).

2. The system for accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 1, characterized in that: The supercritical fluid injection module also includes a supercritical fluid storage tank, and the compression module includes a compressor for compressing the supercritical fluid, and the supercritical fluid storage tank is connected to the compressor; the supercritical fluid storage tank is connected to a supercritical fluid injection pipe, and the supercritical fluid injection pipe is connected to the thermal insulation water pipe (1) for conveying CO2 fluid into the supercritical CO2 fluid flow channel.

3. The system for accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 2, characterized in that: The heat-insulating water pipe (1) comprises an outer pipe (11) and an inner pipe (12) which are coaxially sleeved, wherein a receiving cavity is formed between the outer pipe (11) and the inner pipe (12), wherein a plurality of heat exchange pipes (13) are arranged in the receiving cavity, and the water inlet and the water outlet of the heat exchange pipe (13) are respectively connected to a water inlet pipe and a water outlet pipe arranged on the ground.

4. The system for accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 2, characterized in that: The microorganism injection module also includes a microorganism storage tank for CO2 mineralization, and the microorganism storage tank for CO2 mineralization is connected to the microorganism agent delivery pipe (2) through a pipeline.

5. The system for accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 3, characterized in that: The inner radius of the microbial agent delivery pipe (2) and the inner radius of the inner pipe (12) satisfy the following relationship: in: r is the inner radius of the microbial agent delivery pipe, in m; R is the inner radius of the inner tube, in m.

6. A method for accelerating the mineralization of CO2 in groundwater using microorganisms, characterized in that: The method is implemented by a system for accelerating the mineralization of CO2 in groundwater using microorganisms as described in any one of claims 1 to 5, comprising injecting purified and compressed CO2 into the groundwater system by supercritical fluid injection, and injecting cultured CO2 mineralizing microorganisms into the groundwater system; The CO2 mineralization microorganisms are composed of carbonic anhydrase-producing bacteria, sulfate-reducing bacteria, iron-reducing bacteria and urea-decomposing bacteria.

7. The method for accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 6, characterized in that: In the CO2 mineralization microorganisms, the mass ratio of carbonic anhydrase producing bacteria, sulfate reducing bacteria, iron reducing bacteria and urea decomposing bacteria is: (5.0-6.0): (3.0-4.0): (0.5-1.0): (1.0-2.0).

8. The method of accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 6, characterized in that: The carbonic anhydrase-producing bacteria are selected from one or more of Bacillus cereus, Bacillus licheniformis, Bacillus mucilaginosus, Methanobacterium thermophilum, and Pyrococcus hallii; the sulfate-reducing bacteria are selected from one or more of the genera Thiovibrio, Desulfomonas, Desulfolobus, Desulfur Enterobacter, Desulfobacterium, Desulfococcus, Desulfosarcina, and Desulfuromyces; the iron-reducing bacteria are selected from one or more of the genera Thermotogales and Thermoanaerobacteriales, and the urea-decomposing bacteria are selected from one or more of Ureabacillus pastoris, Helicobacter pylori, Mycoplasma, Uric acid bacteria, Proteus, Salmonella, and Staphylococcus.

9. The method for accelerating the mineralization of CO2 in groundwater using microorganisms as claimed in claim 6, characterized in that: The injection parameters of the supercritical fluid injection include: an injection temperature of 50 to 80° C. and an injection pressure of 5 to 10 MPa.

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