Method and apparatus for carbon dioxide fixation by carbonic anhydrase-strengthened silicate minerals

Abstract

The application discloses a method and device for fixing carbon dioxide by using carbonic anhydrase to strengthen silicate minerals. The method uses sodium alginate and chitin to construct a composite carrier, loads carbonic anhydrase after cross-linking modification by genipin, and fills the carrier into a catalytic hydrolysis tower at a dosage of 8-16 g / L to accelerate the hydration and dissociation reaction of CO2. The obtained absorption liquid is sent into a carbon fixation tower of fluidized silicate slurry, metal cations in the minerals are dissolved at pH 7.5-10.6, the metal cations react with HCO3 ‑ and CO3 2‑ generated by dissociation in water, and are finally converted into carbonate precipitates. The method has the advantages of high catalytic efficiency and strong enzyme stability, and can realize the resource utilization of silicate industrial solid wastes while efficiently fixing carbon dioxide.

Description

Technical Field

[0001] This invention belongs to the technical field of industrial solid waste resource utilization and carbon dioxide fixation, specifically relating to a method for carbon dioxide fixation by silicate minerals enhanced by carbonic anhydrase. Background Technology

[0002] With the continued growth of global energy consumption, the fossil fuel-dominated energy structure has kept CO2 emissions high, further exacerbating the greenhouse effect and climate change. Carbon sequestration technology, through artificial intervention, converts CO2 into a stable form, and is one of the key pathways to achieving carbon neutrality. Among these technologies, silicate mineral carbonation is a geological sequestration technique that draws on the principles of natural weathering. It utilizes silicate minerals rich in alkaline earth metals such as calcium and magnesium to react with CO2 to generate thermodynamically stable carbonates, thereby achieving long-term carbon fixation. According to data from the "China Ecological Environment Statistics Yearbook (2022)," my country generates more than 2 billion tons of silicate industrial solid waste annually, including coal gangue, steel slag, and fly ash, indicating a huge potential for carbon sequestration. However, silicate carbonation is extremely slow under natural conditions, making it difficult to meet the inherent requirements of industrial applications for reaction efficiency and processing scale. This limits the direct application of this type of technology in the fields of solid waste resource utilization and carbon sequestration.

[0003] The carbonation reaction of silicate minerals involves three main steps: CO2 dissolution, metal ion dissolution, and carbonate precipitation. Among these, the slow dissolution rate of CO2 in the aqueous phase is a key factor limiting the overall reaction efficiency. Carbonic anhydrase, as a highly efficient biocatalyst, can accelerate the CO2 hydration process and improve its dissolution and conversion rates, showing great potential in industrial flue gas CO2 capture. However, free carbonic anhydrase is highly sensitive to environmental conditions and is easily deactivated under the influence of factors such as temperature, pH, and metal ions, and is difficult to recover and reuse, thus limiting its practical engineering application. To improve the feasibility of carbonic anhydrase applications in industrial settings, immobilization technology has been extensively studied. Patent CN102343199A discloses a method and supporting device for enhancing mineral carbonation and CO2 immobilization, employing an immobilized carbonic anhydrase packed tower coupled with mineral leaching, dissolving calcium ions under ultrasonic assistance to form a Ca-rich solution. 2+The slurry is introduced into a reactor containing calcium-based alkaline substances, where a carbonation reaction occurs to fix CO2. However, the carrier used in this type of technology has a weak adsorption capacity for carbonic anhydrase, leading to easy loss and inactivation of the enzyme molecules, resulting in insufficient stability and operational efficiency of the carbon fixation system. Patent CN114525309A discloses a method for efficiently converting carbon dioxide to prepare porous aragonite, using sodium alginate to embed carbonic anhydrase to prepare gel beads, which are then mixed with carboxymethyl cellulose and calcium chloride solution before being purged with CO2 gas to prepare porous aragonite. This method relies on the fact that the gel beads prepared with sodium alginate are not surface-crosslinked, resulting in weak binding force when loaded with carbonic anhydrase. In practical applications, significant loss occurs, leading to a substantial decrease in continuous operation efficiency. Furthermore, this process involves continuously adding 2%–5% calcium chloride solution to fix CO2 and prepare aragonite-type calcium carbonate, an operation mode that is difficult to promote and implement in industrial applications. Patent CN201910323901.7 discloses a method for immobilizing carbonic anhydrase in mesoporous silica-based materials and its preparation and application. The method involves adding an aqueous solution of carbonic anhydrase to a suspension of mesoporous silica-based materials. When the immobilized carbonic anhydrase particles are applied to an integrated vacuum carbonate absorption process to capture CO2 in flue gas, the absorption rate is 1.57 times higher than that of a pure 2wt% potassium carbonate solution.

[0004] Existing research has explored the design of immobilized carbonic anhydrase carriers and their application in enhancing CO2 absorption. However, the immobilized enzymes suffer from insufficient stability and rapid activity decay, and also exhibit significant shortcomings in process integration and continuous operation capabilities, hindering their industrial application. Therefore, developing an immobilized carbonic anhydrase system that combines high enzyme activity and excellent stability, and effectively coupling it with the conversion or resource utilization of silicate industrial solid waste, is of great significance for constructing an efficient, stable, and low-cost synergistic carbon sequestration system. Summary of the Invention

[0005] The primary objective of this invention is to provide a method for carbonic anhydrase-enhanced silicate mineral carbon dioxide fixation. This method involves constructing a composite support using sodium alginate and chitin, followed by genipin cross-linking modification, and then loading carbonic anhydrase onto the support to prepare a highly active and stable immobilized enzyme catalyst. This catalyst is then packed into a catalytic hydrolysis tower to accelerate the co-dissociation of CO2 and water to generate HCO3. - With CO3 2- The absorbent is fed into a carbon fixation tower containing fluidized silicate slurry, constructing a continuous conversion system of "enzyme catalysis—silicate mineral dissolution—carbonate precipitation," achieving efficient CO2 capture and simultaneous mineralization fixation under mild conditions. A second objective of this invention is to provide an apparatus for realizing a method of carbonic anhydrase-enhanced carbon dioxide fixation from silicate minerals.

[0006] The first objective of this invention is achieved as follows:

[0007] S1. Sodium alginate and chitin powder are mixed evenly in deionized water and added dropwise to a curing solution to form spherical gel particles. Then, they are transferred to a crosslinking solution for surface modification. The surface residue of the gel particles is washed with phosphate buffer solution and then freeze-dried to obtain carrier particles.

[0008] S2. The carrier particles were transferred to the carbonic anhydrase loading solution, impregnated under constant temperature and shaking conditions, and then freeze-dried to obtain the carbonic anhydrase catalyst.

[0009] S3. The carbonic anhydrase catalyst is loaded into a catalytic hydrolysis tower. CO2 gas is introduced from the bottom of the tower and comes into contact with the absorbent and catalyst, undergoing hydration and dissociation reactions to generate HCO3. - With CO3 2- ion;

[0010] S4. After mixing silicate minerals with water to form a slurry, introduce it into the slurry carbon fixation tower. Circulate liquid is introduced from the bottom to promote the fluidization of solid particles in the slurry. The height of the particles along the top edge is controlled at 2 / 3 to 3 / 4 of the liquid level in the slurry carbon fixation tower. The circulating liquid is drawn out from 4 / 5 of the liquid level in the slurry carbon fixation tower. Part of the circulating liquid is returned to the mixing tank, and the rest is returned to the buffer tank and pumped back to the slurry carbon fixation tower. When the pH value in the carbon fixation tower drops to the set value, 1 / 5 of the mixed slurry is discharged from the bottom of the tower, and fresh silicate mineral slurry of equal volume and equal solid concentration is added in time to maintain the continuous operation of silicate mineral CO2 fixation.

[0011] Preferably, the mass fraction of sodium alginate in the mixture in step S1 is 1.5% to 3.0%, and the mass fraction of chitin powder is 1.0% to 2.5%.

[0012] Preferably, the curing molding liquid in step S1 is prepared by a calcium chloride solution with a concentration of 0.15~0.20mol / L and glycerol with a volume fraction of 1.0%~1.5%, and the volume ratio of the two is 8:1~10:1.

[0013] Preferably, the crosslinking solution in step S1 is a genipin solution prepared with phosphate buffer, with a concentration of 0.1% to 0.3% (w / v) and a pH value of 7.0 to 7.5.

[0014] Preferably, in step S2, the carbonic anhydrase solution is prepared using a phosphate buffer solution with a pH of 7.2-7.5, and the carbonic anhydrase concentration is 3-6 g / L.

[0015] Preferably, in step S2, the ratio of the carrier particle mass to the enzyme solution volume is 1:8 to 1:10 (g / mL), and the immersion treatment time is 2 to 4 hours.

[0016] Preferably, in step S3, the amount of enzyme catalyst loaded in the catalytic hydrolysis tower is 8~16g / L, and the residence time of CO2 in the absorbent is 4~8s.

[0017] Preferably, in step S4, the silicate solids content in the slurry carbon fixation tower is 5.5%~9.0%, the slurry pH value is 7.5~10.6, and 25%~50% of the outflowing circulating liquid is sent to the mixing tank to mix with the absorbent liquid in the catalytic hydrolysis tower.

[0018] The second objective of this invention is achieved as follows: The invention comprises a slurry carbon fixation tower, a catalytic hydrolysis tower, a first circulating pump, a buffer tank, a mixing tank, a second circulating pump, and an air pump. The slurry carbon fixation tower has a feed inlet at the top and a discharge outlet at the bottom. An outlet is located on the upper side of the slurry carbon fixation tower, and the outlet is connected to the buffer tank and the mixing tank via pipes. The lower outlet of the buffer tank is connected to the lower circulating inlet of the slurry carbon fixation tower via a pipe, and the pipe is equipped with the first circulating pump. The catalytic hydrolysis tower contains a perforated plate filled with carbonic anhydrase catalyst. An aeration device is located at the bottom of the catalytic hydrolysis tower and connected to the air pump. The bottom outlet of the catalytic hydrolysis tower is connected to the mixing tank via a pipe, and a water outlet valve is located at the bottom of the catalytic hydrolysis tower. The mixing tank is connected to a spray device at the top of the catalytic hydrolysis tower via a pipe, and the pipe is equipped with the second circulating pump. The mixing tank is connected to a clean water pipe.

[0019] Each pipe in the device can be equipped with a valve to control the opening and closing of the pipe; the perforated plate is a common type of perforated plate used in catalysts in this field; the aeration device is usually equipped with multiple aeration heads, while the spraying device is equipped with multiple spray heads.

[0020] Preferably, the porous plate has two layers, which are spaced apart vertically.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The carbonic anhydrase catalyst prepared by this invention has excellent properties such as high catalytic efficiency, stable operation, and long service life.

[0023] This invention constructs a two-stage series system of a catalytic hydrolysis tower and a slurry carbon fixation tower, which intensifies the CO2 hydration and mineral carbonation processes in stages. By combining fluidized slurry operation with partial circulating liquid reflux, the reaction conditions can be precisely controlled and the system can operate continuously and stably.

[0024] This invention uses widely available and inexpensive silicate minerals or industrial solid waste as carbon fixation media, which efficiently fixes CO2 while promoting the resource utilization of silicate industrial solid waste.

[0025] The device of this invention has a simple structure and compact layout, with clear division of functions among its components. By setting up a slurry carbon fixation tower and a catalytic hydrolysis tower, combined with the reasonable configuration of a buffer tank, a mixing tank, and a circulating pump, a stable dual circulation loop is formed. This not only maintains the fluidization state of the slurry in the slurry carbon fixation tower, but also ensures efficient contact and independent control of the gas and liquid phases in the catalytic hydrolysis tower. The device of this invention is easy to operate, runs stably, and has good continuous operation and adaptability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0027] In the diagram: 1-Slurry carbon fixation tower, 2-Catalytic hydrolysis tower, 3-First circulation pump, 4-Buffer tank, 5-Mixing tank, 6-Second circulation pump, 7-Air pump, 8-Aeration device, 9-Spraying device, 10-Clear water pipe, 11-Perforated plate. Detailed Implementation

[0028] The following specific implementation examples further illustrate the present invention, providing detailed implementation methods and operating procedures, but the scope of protection of the present invention is not limited to the content described.

[0029] Example 1

[0030] Sodium alginate and chitin powder were added to deionized water and mixed thoroughly, with sodium alginate having a mass fraction of 2.0% and chitin having a mass fraction of 1.5%. This mixture was then added dropwise to a curing solution to form spherical gel particles. The curing solution was prepared with 0.18 mol / L calcium chloride and 1.2% glycerol in a volume ratio of 9:1. The spherical gel particles were transferred to a genipin solution prepared with phosphate buffer (0.2% mass fraction, pH adjusted to 7.2). The surface-modified gel particles were removed, and the surface residues were washed with phosphate buffer solution, followed by freeze-drying to obtain carrier particles. The carrier particles were then transferred to a carbonic anhydrase loading solution and immersed at room temperature for 3 hours. The loading solution was prepared with phosphate buffer solution at pH 7.3, and the carbonic anhydrase concentration was 4.8 g / L. The mass ratio of carrier particles to loading solution was 1:8 (g / mL). The carbonic anhydrase-loaded carrier particles were then removed and freeze-dried to prepare the carbonic anhydrase catalyst.

[0031] Carbonic anhydrase catalyst was loaded into a catalytic hydrolysis tower with an inner diameter of 20 cm and a height of 200 cm. The liquid level inside the tower was 130 cm. An absorbent reflux port was installed at a height of 170 cm in the catalytic hydrolysis tower. 480 g of enzyme catalyst was added at a loading rate of 12 g / L, and it was packed in two equal layers with a spacing of 50 cm between them. The upper layer was 30 cm above the liquid surface. A concentration of 2160 mg / L was introduced from the bottom of the tower. 3The CO2 gas is introduced, and the inlet flow rate is controlled so that the bubbles stay in the absorbent liquid for 5-6 seconds.

[0032] The slurry carbon fixation tower has a diameter of 15 cm and a height of 2 m. Carbon fixation slurry is injected into the tower, containing 6.7% silicate solid waste blast furnace slag, with an initial pH of 8.9. During operation, 40% of the circulating liquid flowing out from the top of the carbon fixation tower is sent to a mixing tank, mixed with the absorbent from the catalytic hydrolysis tower, and then sent back to the mixing tank at the original volumetric flow rate to mix with the remaining 60% of the circulating liquid. This mixture is then pumped from the bottom of the tower into the carbon fixation tower, keeping the blast furnace slag slurry in a liquefied state. When the pH of the circulating liquid drops to 7.5, 1 / 5 of the mixed slurry is discharged from the bottom of the tower, and fresh blast furnace slag slurry of equal volume and solids concentration is promptly added to maintain continuous silicate slurry carbon fixation operation. A blank control group without enzyme catalyst was set up in the catalytic hydrolysis tower, with all other operating conditions the same as the experimental group.

[0033] During continuous operation, the CO2 content in the tail gas from the catalytic hydrolysis tower outlet of the experimental group was 940~1090 mg / m³. 3 The carbon fixation efficiency ranged from 49.5% to 56.5%, with an average of 53.0%. The operating time was 6.4 to 6.8 hours when the pH of the circulating liquid in the slurry carbon fixation tower dropped to 7.5. In the blank group, the catalytic hydrolysis tower was not filled with enzyme catalyst, and the CO2 content in the outlet tail gas was 1490 to 1710 mg / m³. 3 The carbon fixation efficiency ranges from 20.8% to 31.0%, with an average of 25.9%. When the pH of the circulating liquid in the slurry carbon fixation tower drops to 7.5, the operating time is 11.2 to 11.4 hours.

[0034] Example 2

[0035] When preparing the carrier particles, the mass fraction of sodium alginate was 1.6%, the mass fraction of chitin was 2.3%, and the mass fraction of genipin was 0.3% during the crosslinking treatment; during the loading treatment, the concentration of carbonic anhydrase was 5.5 g / L, and the impregnation time was 4 h; 360 g of enzyme catalyst was added at a loading amount of 9 g / L; the remaining process conditions were exactly the same as in Example 1.

[0036] During continuous operation, the CO2 content in the tail gas from the catalytic hydrolysis tower outlet of the experimental group was 890~1015 mg / m³. 3 The carbon fixation efficiency ranged from 52.8% to 58.8%, with an average of 55.8%. The operating time was 6.1 to 6.4 hours when the pH of the circulating liquid in the slurry carbon fixation tower dropped to 7.5. The CO2 content in the outlet exhaust gas of the blank group was 1480 to 1700 mg / m³. 3 The carbon fixation efficiency was 21.3%~31.5%, with an average of 26.4%; when the pH of the circulating liquid in the slurry carbon fixation tower dropped to 7.5, the operating time was 10.9~11.2h.

[0037] Example 3

[0038] When preparing the enzyme catalyst, the carbonic anhydrase concentration in the loading solution was 3.2 g / L, the ratio of carrier particle mass to enzyme solution volume was 1:10 (g / mL), and the impregnation time was 3 h; 600 g of enzyme catalyst was added at a loading rate of 15 g / L; potassium feldspar was used to prepare the carbon fixation slurry with a mass concentration of 8.2% and an initial pH of 10.1; the other process conditions not mentioned were exactly the same as in Example 1.

[0039] During continuous operation, the CO2 content in the tail gas from the catalytic hydrolysis tower outlet of the experimental group was 920~1040 mg / m³. 3 The carbon fixation efficiency ranged from 51.8% to 57.4%, with an average of 54.6%. The operating time was 6.0 to 6.2 hours when the pH of the circulating liquid in the slurry carbon fixation tower dropped to 7.5. The CO2 content in the outlet exhaust gas of the blank group was 1570 to 1660 mg / m³. 3 The carbon fixation efficiency is 23.1%~27.3%, with an average of 25.2%; when the pH value of the circulating liquid in the slurry carbon fixation tower drops to 7.5, the operation time is 9.3~9.5h.

[0040] Example 4

[0041] This embodiment describes an apparatus for implementing the carbon dioxide fixation method for silicate minerals enhanced by carbonic anhydrase as described in Embodiment 1. The apparatus includes a slurry carbon fixation tower 1, a catalytic hydrolysis tower 2, a first circulation pump 3, a buffer tank 4, a mixing tank 5, a second circulation pump 6, and an air pump 7. The slurry carbon fixation tower 1 has a feed inlet at the top and a discharge outlet at the bottom. An outlet is located on the upper side of the slurry carbon fixation tower 1, and this outlet is connected to the buffer tank 4 and the mixing tank 5 via pipes. The lower outlet of the buffer tank 4 is connected to the lower circulation inlet of the slurry carbon fixation tower 1 via a pipe. The pipeline is equipped with a first circulation pump 3. The catalytic hydrolysis tower 2 is equipped with a porous plate 11, which is filled with carbonic anhydrase catalyst. The bottom of the catalytic hydrolysis tower 2 is equipped with an aeration device 8, which is connected to an air pump 7. The bottom outlet of the catalytic hydrolysis tower 2 is connected to a mixing tank 5 through a pipeline. The bottom of the catalytic hydrolysis tower 2 is equipped with a water outlet valve. The mixing tank 5 is connected to a spray device 9 at the top of the catalytic hydrolysis tower 2 through a pipeline. The pipeline is equipped with a second circulation pump 6. The mixing tank 5 is connected to a clean water pipe 10.

[0042] The working principle and process of the device of this invention: The porous plate 11 of the catalytic hydrolysis tower 2 is filled with carbonic anhydrase catalyst; before start-up, clean water is injected into the mixing tank 5 through the clean water pipe 10, and then sent from the top of the catalytic hydrolysis tower 2 to the spray device 9 via the second circulation pump 6 and sprayed into the catalytic hydrolysis tower 2. When the liquid level is about 20cm higher than the upper catalyst layer of the catalytic hydrolysis tower 2, the injection of clean water is stopped and the bottom outlet valve of the catalytic hydrolysis tower 2 is opened. The valve opening is adjusted to maintain the liquid level in the catalytic hydrolysis tower 2 basically unchanged; CO2 mixed gas is sent from the bottom of the tower through the air pump 7 and the aeration device 8. During its ascent, it comes into contact with the catalyst to complete the catalytic hydration and dissociation reaction, and the tail gas escapes from the top of the catalytic hydrolysis tower 2; at the same time, the pre-mixed silicate slurry is added from the top of the mineral slurry carbon fixation tower 1. After the feed is fed into the slurry and reaches the predetermined liquid level, the upper outlet valve and the lower return valve of the slurry carbon fixation tower 1 are opened and their openings are adjusted to maintain a constant slurry level in the slurry carbon fixation tower 1. A portion of the outflowing circulating liquid is sent to the mixing tank 5 to mix with the absorbent liquid of the catalytic hydrolysis tower 2, and then returned in equal volume to the buffer tank 4 to mix with the remaining circulating liquid discharged from the outlet. After that, it is fed into the slurry from the lower circulation inlet of the slurry carbon fixation tower 1 through the first circulation pump 3, so that the solid particles in the slurry are in a fluidized state. When the pH value of the slurry in the slurry carbon fixation tower 1 drops to 7.5, the bottom outlet valve of the tower is opened to discharge 1 / 5 of the mixed slurry. Then, fresh silicate slurry with an equal volume and equal solids concentration is added in a timely manner. This cycle is repeated to maintain the continuous operation of silicate mineral CO2 fixation.

Claims

1. A method for carbon dioxide fixation in silicate minerals enhanced by carbonic anhydrase, characterized in that, Includes the following steps: S1. Sodium alginate and chitin powder are mixed evenly in deionized water and added dropwise to a curing solution to form spherical gel particles. Then, they are transferred to a crosslinking solution for surface modification. The surface residue of the gel particles is washed with phosphate buffer solution and then freeze-dried to obtain carrier particles. S2. The carrier particles were transferred to a carbonic anhydrase loading solution prepared with phosphate buffer, and immersed under constant temperature and shaking conditions. After removal, the particles were freeze-dried to obtain the carbonic anhydrase catalyst. S3. The carbonic anhydrase catalyst is loaded into a catalytic hydrolysis tower. CO2 gas is introduced from the bottom of the tower and comes into countercurrent contact with the absorbent liquid. After hydration reaction, it further dissociates to generate HCO3. - With CO3 2- ; S4. After mixing silicate minerals with water to form a slurry, introduce it into the slurry carbon fixation tower. Circulate liquid is introduced from the bottom to promote the fluidization of solid particles in the slurry. The height of the particles along the top edge is controlled at 2 / 3 to 3 / 4 of the liquid level in the slurry carbon fixation tower. The circulating liquid is drawn out from 4 / 5 of the liquid level in the slurry carbon fixation tower and returned. Part of it is sent to the mixing tank, and the rest is returned to the buffer tank and then sent back to the slurry carbon fixation tower via a circulation pump. When the pH value in the slurry carbon fixation tower drops to the set value, 1 / 5 of the mixed slurry is discharged from the bottom of the tower and fresh silicate mineral slurry of equal volume and equal solid concentration is added in time to maintain the continuous operation of silicate mineral CO2 fixation.

2. The method according to claim 1, characterized in that, In step S1, the mass fraction of sodium alginate in the mixture is 1.5% to 3.0%, and the mass fraction of chitin powder is 1.0% to 2.5%.

3. The method according to claim 1, characterized in that, In step S1, the curing and molding liquid is prepared by mixing a calcium chloride solution with a concentration of 0.15~0.20mol / L and a glycerol solution with a volume fraction of 1.0%~1.5%, with a volume ratio of 8:1~10:

1.

4. The method according to claim 1, characterized in that, In step S1, the crosslinking solution is a genipin solution prepared with phosphate buffer, with a concentration of 0.1% to 0.3% (w / v) and a pH value of 7.0 to 7.

5.

5. The method according to claim 1, characterized in that, In step S2, the carbonic anhydrase loading solution is prepared using phosphate buffer solution with a pH of 7.2-7.5, and the carbonic anhydrase concentration is 3-6 g / L.

6. The method according to claim 1, characterized in that, In step S2, the ratio of the carrier particle mass to the enzyme solution volume is 1:8 to 1:10 (g / mL), and the immersion treatment time is 2 to 4 hours.

7. The method according to claim 1, characterized in that, In step S3, the amount of enzyme catalyst loaded in the catalytic hydrolysis tower is 8~16g / L, and the residence time of CO2 in the absorption liquid is 4~8s.

8. The method according to claim 1, characterized in that, In step S4, the solid content of the slurry in the slurry carbon fixation tower is 5.5%~9.0%, the pH value of the slurry is 7.5~10.6, and 25%~50% of the outflowing circulating liquid is sent to the mixing tank to mix with the absorbent liquid of the catalytic hydrolysis tower.

9. An apparatus for implementing the carbon dioxide fixation method of silicate minerals enhanced by carbonic anhydrase according to any one of claims 1 to 8, comprising a slurry carbon fixation tower (1), a catalytic hydrolysis tower (2), a first circulating pump (3), a buffer tank (4), a mixing tank (5), a second circulating pump (6), and an air pump (7), characterized in that... The slurry carbon fixation tower (1) is provided with a feeding port at the top and a discharge port at the bottom. The upper side of the slurry carbon fixation tower (1) is provided with a flow outlet. The flow outlet is connected to the buffer tank (4) and the mixing tank (5) through pipes. The lower outlet of the buffer tank (4) is connected to the lower circulation inlet of the slurry carbon fixation tower (1) through a pipe. The pipe is provided with a first circulation pump (3). The catalytic hydrolysis tower (2) is provided with a perforated plate (11). The perforated plate (11) is filled with carbonic anhydrase catalyst. The bottom of the catalytic hydrolysis tower (2) is provided with an aeration device (8). The aeration device (8) is connected to an air pump (7). The bottom outlet of the catalytic hydrolysis tower (2) is connected to the mixing tank (5) through a pipe. The bottom of the catalytic hydrolysis tower (2) is provided with a water outlet valve. The mixing tank (5) is connected to the upper spray device (9) in the catalytic hydrolysis tower (2) through a pipe. The pipe is provided with a second circulation pump (6). The mixing tank (5) is connected with a clean water pipe (10).

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