Carbon sequestration and alcohol production device for photocatalysis coupling microorganisms

Abstract

The utility model discloses a carbon sequestration and alcohol production device for photocatalysis coupling microorganisms. The carbon sequestration and alcohol production device comprises a photobioreactor, a gas inlet unit and a tail gas collecting device, a mixed solution of microorganisms and a photocatalyst is arranged in the photobioreactor, the gas inlet unit is used for providing a carbon gas into the reaction cavity, the photocatalyst receives illumination to generate electrons to supply energy to the microorganisms, and the microorganisms reduce the carbon gas into carbon-containing organic matters. According to the device, a microorganism complete cell environment is utilized, and activation barriers are reduced; the photocatalyst is utilized to efficiently and stably obtain light energy to generate electrons and supply the electrons to microorganisms, so that the problem of insufficient electron and energy supply in the carbon sequestration process is solved. By utilizing the characteristic that the special-shaped plate of the photobioreactor has a relatively high specific surface area under illumination, the utilization rate of light energy is improved, and the special-shaped plate structure can realize variable-speed flowing of fluid in the system and strengthen the mixing effect; the gas-liquid mass transfer of the reactor is promoted by adopting pneumatic stirring, and the conversion efficiency of the system to the carbon gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of biological carbon fixation, and in particular to a carbon fixation and alcohol production device of photocatalytically coupled microorganisms. Background Art

[0002] In September 2020, the Chinese government pledged to the world to strive to achieve carbon peak by 2030 and carbon neutrality by 2060, namely the "dual carbon" goal. The proposal of the "dual carbon" goal demonstrates China's firm determination to actively respond to climate change and take the path of green and low-carbon development, which will have a profound impact on my country's future social and economic operation mode, ecological environment quality, industrial structure layout, and life and consumption patterns.

[0003] The use of fossil fuels inevitably releases large amounts of CO into the atmosphere. 2 , leading to an increasingly serious global greenhouse effect. 2 As a potential carbon resource, it can synthesize a variety of high value-added chemicals or fuels. 2 The capture, storage and utilization of oxygen has become the research focus of scientific researchers.

[0004] Among the traditional carbon fixation pathways, the photocatalytic method has a simple process and a long service life, but it has the disadvantages of poor product selectivity and no self-repair ability; while the biological carbon fixation pathway has mild reaction conditions and does not cause secondary pollution, but it relies on H 2 Energy supply, resulting in insufficient electron supply and low carbon fixation efficiency. Utility Model Content

[0005] Based on this, it is necessary to target the existing carbon fixation pathways. The photocatalytic method has poor product selectivity and no self-repair ability, and the biological carbon fixation pathway is dependent on H 2 Energy supply causes insufficient electron supply and low carbon fixation efficiency. A photocatalytic coupled microbial carbon fixation and alcohol production device is provided.

[0006] A photocatalytic coupled microbial carbon fixation and alcohol production device, comprising:

[0007] A photobioreactor is provided with a reaction cavity, wherein a mixed solution of microorganisms and photocatalysts is provided in the reaction cavity, and the photobioreactor is provided with an air outlet communicated with the reaction cavity;

[0008] An air intake unit is used to provide a carbon gas into the reaction chamber, the carbon gas enters the mixed liquid, the photocatalyst receives light to generate electrons to provide energy for the microorganisms, and the microorganisms reduce the carbon gas to carbon-containing organic matter;

[0009] The tail gas collection device is used to collect the gas discharged from the gas outlet after the reaction in the reaction chamber.

[0010] In one embodiment, the photobioreactor is plate-shaped, and two opposite inner walls of the photobioreactor are provided with symmetrical wave-shaped protrusions, so that the flow channel cross-section of the reaction chamber can be varied to enhance gas-liquid mass transfer.

[0011] In one embodiment, the outer wall of the photobioreactor is provided with wave-shaped protrusions to increase the specific surface area of ​​the photobioreactor receiving light.

[0012] In one embodiment, the protrusions on the outer wall and the inner protrusions of the photobioreactor are located on the same side wall, and the side wall of the photobioreactor provided with the protrusions is formed by bending a plate.

[0013] In one of the embodiments, an aerator is provided at the bottom of the reaction chamber, the air inlet unit is connected to the aerator, and the aerator is used to fully mix the mixed liquid and the mono-carbon gas.

[0014] In one embodiment, a liquid outlet is provided on a side wall of the photobioreactor, the liquid outlet is communicated with the reaction chamber, and the carbon-containing organic matter is collected through the liquid outlet.

[0015] In one embodiment, the photobioreactor further includes an external light source plate, and the external light source plate is used to provide a stable light source for the photobioreactor.

[0016] In one embodiment, the air intake unit includes a carbon gas generator and a gas volume regulating valve installed at the gas outlet end of the generator. The gas outlet end of the gas bottle is connected to the reaction chamber through an outlet pipeline to provide a carbon gas for photocatalytic microorganisms to produce the carbon-containing organic matter.

[0017] In one of the embodiments, the exhaust gas collection device is sealed and connected to the reaction chamber through an exhaust pipe, and the exhaust gas collection device is a sealed structure to prevent external air from entering.

[0018] In the above-mentioned carbon fixation and alcohol production device for photocatalytically coupled microorganisms, the air intake unit introduces a carbon gas into the reaction chamber, and the carbon gas enters the mixed liquid. The photocatalyst receives light to generate electrons to provide energy for the microorganisms, and the microorganisms reduce the carbon gas to carbon-containing organic matter. After the reaction, the excess gas is discharged from the gas outlet and collected by the tail gas collection device. The above-mentioned carbon fixation and alcohol production device for photocatalytically coupled microorganisms utilizes the complete cell environment of the microorganisms to improve the selectivity of the reduction product and reduce the activation barrier. At the same time, the photocatalyst is used to efficiently and stably obtain light energy to generate electrons, replacing the reduction of H in the microbial reduction path. 2 to solve the problem of insufficient supply of electrons and energy in the carbon fixation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0020] Figure 1 A three-dimensional diagram of a carbon fixation and alcohol production device for photocatalysis coupled with microorganisms in one embodiment;

[0021] Figure 2 for Figure 1 The front view of the carbon fixation and alcohol production device of photocatalysis coupled with microorganisms shown;

[0022] Figure 3 for Figure 1 A cross-sectional view of the carbon fixation and alcohol production device of photocatalysis coupled with microorganisms shown;

[0023] Figure 4 for Figure 1 Cross-sectional view of the mesophotobioreactor;

[0024] Figure 5 for Figure 1 Schematic diagram of the structure of the air intake unit.

[0025] Reference numerals:

[0026] 10-photobioreactor, 11-reaction chamber, 12-gas outlet, 13-protrusion, 14-aerator, 15-liquid outlet, 20-air inlet unit, 21-carbon gas generator, 22-gas volume regulating valve, 23-pressure gauge, 24-four-way diverter, 30-tail gas collection device, 31-outer cylinder, 32-inner cylinder, 33-gas collecting chamber, 34-colored liquid, 35-gas outlet pipe, 36-cap, 40-gas outlet pipeline, 50-exhaust pipeline. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] See also Figure 1 and Figure 2 In one embodiment, a carbon fixation and alcohol production device for photocatalysis coupled with microorganisms includes a photobioreactor 10, an air intake unit 20 and an exhaust gas collection device 30.

[0031] Please also read Figure 3 and Figure 4 The photobioreactor 10 is provided with a reaction chamber 11 , in which a mixed solution of microorganisms and photocatalysts is provided, and the photobioreactor 10 is provided with an air outlet 12 communicated with the reaction chamber 11 .

[0032] In one embodiment, the photocatalyst is a semiconductor material InP, and the microorganism is Acetobacter woodii. It is understood that in other embodiments, the material of the photocatalyst and the type of the microorganism can be selected from other types as needed.

[0033] The specific process of mixing microorganisms and photocatalysts is as follows: the cultured bacterial solution is placed in a centrifuge to obtain the desired bacterial precipitate. The culture medium is configured according to the characteristics of the bacteria. After the culture medium, centrifuge tank, culture bottle and other instruments are sterilized and deoxygenated, the bacteria are added to the culture medium in an anaerobic workstation for expansion. After a period of culture, the InP catalyst is added and CO is introduced under blue light. 2 To cultivate.

[0034] The air intake unit 20 is used to provide a carbon gas into the reaction chamber 11. The carbon gas enters the mixed liquid, and the photocatalyst receives light to generate electrons to provide energy for the microorganisms. The microorganisms reduce the carbon gas to carbon-containing organic matter.

[0035] Among them, when a carbon monoxide gas is introduced into the mixed liquid, the lift caused by the density difference between the bubble-containing liquid and the pure liquid is used to make the fluid flow along the flow channel to achieve pneumatic stirring. The photobioreactor 10 is a pneumatic stirring type agitator. Compared with a mechanical stirring reactor, an airlift reactor has a simple structure, low energy consumption, high gas content, and small shear stress. It is not easy to cause separation of the photocatalyst and the microorganisms. The fluidization effect is excellent, and the microbial particles can be completely kept in a suspended state.

[0036] In one embodiment, the photobioreactor 10 is provided with symmetrical wave-shaped protrusions 13 on two inner walls to change the flow channel cross-section of the reaction chamber 11. The change in the flow channel cross-section of the reaction chamber 11 can make the mixed liquid fully contact with the mono-carbon gas, enhance the mixing effect, and improve the utilization efficiency of the mono-carbon gas.

[0037] In one embodiment, the bottom wall of the reaction chamber 11 is provided with an aerator 14, and the air inlet unit 20 is connected to the aerator 14. The aerator 14 can generate microbubbles to drive the mixed liquid to flow, so that the bacterial liquid and the gas are fully mixed, and carbon is supplemented through the ventilation process of gas-liquid transfer.

[0038] Specifically, in this embodiment, there are three aerators 14 , which are evenly arranged on the bottom wall of the reaction chamber 11 , and the air inlet unit 20 is connected to the three aerators 14 through three air outlet pipes 40 to evenly aerate the carbon gas in the reaction chamber 11 .

[0039] In one embodiment, the photobioreactor 10 further includes an external light source panel (not shown), which is used to provide a stable light source for the photobioreactor 10. Specifically, the external light source panel is a blue LED light panel, which matches the direct band gap width of the photocatalyst material used in the system, and provides suitable lighting conditions for the photocatalytic process.

[0040] On the basis of the above embodiment, further, the outer wall of the photobioreactor 10 is provided with a wave-shaped protrusion, so that the photobioreactor 10 has a higher specific surface area for receiving light, and improves the utilization rate of light energy of the device. In this embodiment, the protrusion on the inner wall and the protrusion on the outer wall of the photobioreactor 10 are located on the same side wall, and the side wall of the photobioreactor 10 is formed by bending a plate along the wave-shaped protrusion 13, and the side wall of the photobioreactor 10 is a plate body with a uniform cross-section.

[0041] In one embodiment, the photobioreactor 10 is made of organic glass so that external light can be irradiated into the reaction chamber 11. It is understandable that the photobioreactor 10 can be made of other transparent materials, such as transparent acrylic plates, as long as external light can be irradiated into the reaction chamber 11.

[0042] In one embodiment, a liquid outlet 15 is disposed on the side wall of the photobioreactor 10 . The liquid outlet 15 is connected to the reaction chamber 11 . Carbon-containing organic matter formed by the reaction can be collected through the liquid outlet 15 .

[0043] Please also read Figure 5 In one embodiment, the air intake unit 20 includes a carbon gas generator 21 and a gas volume regulating valve 22. The gas volume regulating valve 22 is installed at the gas outlet end of the carbon gas generator 21. The gas outlet end of the carbon gas generator 21 is connected to the reaction chamber 11 through the gas outlet pipeline 40. Baking soda, citric acid and water can be added to the carbon gas generator 21 to react chemically, thereby providing a stable supply of carbon gas to the photobioreactor 10. The gas volume regulating valve 22 can adjust the gas volume according to demand.

[0044] Furthermore, a pressure gauge 23 is installed at the outlet end of the carbon gas generator 21 to display the pressure in the carbon gas generator 21. Since there are three aerators 14, and the three aerators 14 are respectively connected through three outlet pipes 40, it is necessary to split the outlet end of the carbon gas generator 21, so a four-way splitter 24 is installed at the outlet end of the carbon gas generator 21, and the four-way splitter 24 is respectively connected to the three outlet pipes 40.

[0045] In one embodiment, the air intake unit 20 may not directly react to produce a carbon gas, and the carbon gas of the air intake unit 20 may be obtained indirectly. Specifically, the carbon gas of the air intake unit 20 may also be carbon dioxide produced in industrial parks such as thermal power plants and steel mills, and large-scale production of carbon fixation and alcohol production can be achieved through pipeline connection.

[0046] Please refer again Figure 3 The tail gas collection device 30 is used to collect the gas discharged from the gas outlet 12 after the reaction in the reaction chamber 11. In one embodiment, the tail gas collection device 30 is sealed and connected to the reaction chamber 11 through the exhaust pipe 50, and the tail gas collection device 30 is a sealed structure to prevent external air from entering.

[0047] Specifically, the tail gas collection device 30 includes an outer cylinder 31 and an inner cylinder 32, the diameter of the inner cylinder 32 is smaller than the inner diameter of the outer cylinder 31, the inner cylinder 32 is arranged in the outer cylinder 31, and the space between the outer cylinder 31 and the inner cylinder 32 is a gas collecting cavity 33, and the gas collecting cavity 33 is connected to the gas outlet 12 through the exhaust pipeline 50. The gas collecting cavity 33 is filled with a colored liquid 34, and the gas collecting cavity 33 is connected to the bottom of the inner cylinder 32. The tail gas discharged from the gas outlet 12 can enter the gas collecting cavity 33 through the exhaust pipeline 50, and the colored liquid 34 in the gas collecting cavity 33 is squeezed into the inner cylinder 32 to form a liquid level difference, thereby observing the progress of the reaction.

[0048] In one embodiment, the top of the outer cylinder 31 is provided with an outlet pipe 35 connected to the gas collecting cavity 33, through which the gas in the gas collecting cavity 33 can be discharged after the experiment is completed. At the same time, during use, the outlet pipe 35 can be sealed by a cap 36 to keep the tail gas collection device 30 and the reaction cavity 11 sealed, preventing external air from entering the reactor to destroy the living environment of the microorganisms.

[0049] The working process of the above-mentioned photocatalytic coupled microbial carbon fixation and alcohol production device is specifically as follows:

[0050] The air inlet unit 20 provides a carbon-containing gas to the aerator 14 through the air outlet pipe 40, and a certain amount of carbon-containing gas is provided to the reactor through the aerator 14. The external light source plate provides sufficient light for the photobioreactor 10, and the photocatalyst receives light to generate electrons to provide energy for the bacteria, and the carbon-containing gas is reduced to carbon-containing organic matter through the WL cycle of the bacteria itself. The excess gas in the photobioreactor 10 is discharged from the top outlet 12 and collected by the tail gas collection device 30, and the liquid carbon-containing organic matter can be obtained from the liquid outlet 15.

[0051] The above-mentioned photocatalytic coupled microbial carbon fixation and alcohol production device uses photocatalytic semiconductor materials to generate electrons to replace the microbial carbon dioxide reduction to H 2 The wavy structure of the side wall of the photobioreactor 10 has the characteristic of a high specific surface area for receiving light, which improves the utilization rate of light energy. Pneumatic stirring is used to promote gas-liquid mass transfer in the reactor and improve the conversion efficiency of the system to carbon dioxide. The wavy protrusions 13 on the side wall of the photobioreactor 10 are used to achieve variable speed flow of the fluid in the system and enhance the mixing effect.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A carbon fixation and alcohol production device coupled with photocatalysis and microorganisms, characterized in that: include: A photobioreactor is provided with a reaction cavity, wherein a mixed solution of microorganisms and photocatalysts is provided in the reaction cavity, and the photobioreactor is provided with an air outlet communicated with the reaction cavity; An air intake unit is used to provide a carbon gas into the reaction chamber, the carbon gas enters the mixed liquid, the photocatalyst receives light to generate electrons to provide energy for the microorganisms, and the microorganisms reduce the carbon gas to carbon-containing organic matter; The tail gas collection device is used to collect the gas discharged from the gas outlet after the reaction in the reaction chamber.

2. The device for carbon fixation and alcohol production by photocatalysis coupled with microorganisms according to claim 1, characterized in that: The photobioreactor is plate-shaped, and two opposite inner walls of the photobioreactor are provided with symmetrical wave-shaped protrusions, so that the flow channel cross-section of the reaction cavity can be varied to enhance gas-liquid mass transfer.

3. The device for carbon fixation and alcohol production by photocatalysis coupled with microorganisms according to claim 2, characterized in that: The outer wall of the photobioreactor is provided with wave-shaped protrusions to increase the specific surface area of ​​the photobioreactor receiving light.

4. The device for carbon fixation and alcohol production by photocatalysis coupled with microorganisms according to claim 3, characterized in that: The protrusions on the outer wall and the inner protrusions of the photobioreactor are located on the same side wall, and the side wall of the photobioreactor provided with the protrusions is formed by bending a plate body.

5. The device for carbon fixation and alcohol production by photocatalysis coupled with microorganisms according to claim 1, characterized in that: An aerator is provided at the bottom of the reaction chamber, the air inlet unit is connected to the aerator, and the aerator is used to fully mix the mixed liquid with the mono-carbon gas.

6. The device for carbon fixation and alcohol production by coupling photocatalysis with microorganisms according to claim 1, characterized in that: A liquid outlet is provided on the side wall of the photobioreactor, the liquid outlet is communicated with the reaction chamber, and the carbon-containing organic matter is collected through the liquid outlet.

7. The device for carbon fixation and alcohol production by coupling photocatalysis with microorganisms according to claim 1, characterized in that: The photobioreactor further comprises an external light source plate, which is used to provide a stable light source for the photobioreactor.

8. The device for carbon fixation and alcohol production by photocatalysis coupled with microorganisms according to claim 1, characterized in that: The air intake unit includes a carbon gas generator and a gas volume regulating valve installed at the gas outlet end of the generator. The gas outlet end of the gas bottle is connected to the reaction chamber through a gas outlet pipeline to provide a carbon gas for photocatalytic microorganisms to produce the carbon-containing organic matter.

9. The device for carbon fixation and alcohol production by coupling photocatalysis with microorganisms according to claim 8, characterized in that: The tail gas collecting device is sealed and connected to the reaction chamber through an exhaust pipeline, and the tail gas collecting device is a sealed structure to prevent external air from entering.

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