CN114699908A - Activated sludge coupled device and method for fixing carbon dioxide by driving microorganisms with electric energy - Google Patents
Activated sludge coupled device and method for fixing carbon dioxide by driving microorganisms with electric energy Download PDFInfo
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- CN114699908A CN114699908A CN202210063223.7A CN202210063223A CN114699908A CN 114699908 A CN114699908 A CN 114699908A CN 202210063223 A CN202210063223 A CN 202210063223A CN 114699908 A CN114699908 A CN 114699908A
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- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
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Abstract
The invention discloses a device and a method for fixing carbon dioxide by activated sludge coupled electric energy driven microorganisms, wherein the device comprises a biological cathode system, a non-biological anode system, a communication system, a three-electrode system and an aeration system. The method provides an economical and efficient apparatus and method for fixing carbon dioxide, which can be used for fixing plant exhaust gas containing high concentration carbon dioxide or purified carbon dioxide gas.
Description
Technical Field
The invention relates to a device and a method for fixing carbon dioxide by microorganisms driven by activated sludge coupled electric energy, and belongs to the field of carbon dioxide emission reduction.
Background
A great deal of scientific research shows that carbon dioxide is a main gas causing greenhouse effect and global warming, and in recent years, along with the increasing attention of people on environmental problems, the enhancement of energy conservation and emission reduction becomes an important issue.
Therefore, the invention provides a device and a method for fixing carbon dioxide by microorganisms driven by activated sludge coupled electric energy, which can realize the fixation of carbon dioxide, realize the resource utilization of carbon dioxide and provide technical support for the promotion of carbon emission reduction work in China.
Disclosure of Invention
The invention aims to invent a device and a method for fixing carbon dioxide by using activated sludge coupled electric energy to drive microorganisms. The activated sludge of a sewage treatment plant is used as an inoculation source of the biocatalyst, and due to the supply of exogenous electrons, the carbon fixation efficiency of the microbial catalyst is improved, carbon dioxide is reduced at a biological cathode, and value-added chemicals are generated, so that the method is an economic and effective carbon dioxide fixation method.
The technical scheme of the invention is as follows:
a device for fixing carbon dioxide by microorganisms driven by activated sludge coupled electric energy mainly comprises a non-biological anode chamber, a biological cathode chamber, an air inlet system, a communication system, a three-electrode system and an air outlet system; the biological cathode chamber is internally provided with catholyte, the non-biological anode chamber is internally provided with anolyte, gas participating in reaction enters the reaction device through the gas inlet system, so that the biological cathode chamber and the non-biological anode chamber are filled with gas, the gas is factory waste gas containing high-concentration carbon dioxide, purified carbon dioxide or nitrogen, the non-biological anode chamber and the biological cathode chamber are connected through the communication system to realize proton transfer, the three-electrode system provides electric energy required by the reaction and a carrier of a microbial catalyst biofilm, and the gas generated after the reaction is collected through the gas outlet system.
Further, the non-biological anode chamber comprises: the anode chamber sealing cover is arranged at the upper end of the anode electrolytic cell body; the anode electrolytic cell body is a cylindrical glass bottle, the diameter of the bottle body is 60mm, the height of the bottle body is 80mm, the anode chamber sealing cover is made of polytetrafluoroethylene, threaded openings are formed in the top of the cell body and the anode chamber sealing cover, and the sealing covers are screwed down to maintain a sealed environment.
Further, the biological cathode chamber comprises a cathode electrolytic cell body and a cathode chamber sealing cover, and the cathode chamber sealing cover is arranged at the upper end of the cathode electrolytic cell body; the anode electrolytic cell body is a cylindrical glass bottle, the diameter of the bottle body is 60mm, the height of the bottle body is 80mm, the sealing cover of the cathode chamber is made of polytetrafluoroethylene, threaded openings are formed in the top of the cell body and the sealing cover of the anode chamber, and the sealing covers are screwed tightly to maintain a sealed environment.
Furthermore, the air inlet system comprises an anode chamber air inlet hole, a cathode chamber air inlet hole, an anode chamber air inlet hose and a cathode chamber air inlet hose, wherein the anode chamber air inlet hole is formed in the anode chamber sealing cover, the cathode chamber air inlet hole is formed in the cathode chamber sealing cover, the anode chamber air inlet hose is communicated with the bottom of the anode electrolytic cell body through the anode chamber air inlet hole, and the cathode chamber air inlet hose is communicated with the bottom of the cathode electrolytic cell body through the cathode chamber air inlet hole. The diameter of the air inlet is 9mm, and the specification of the air inlet hose is 6 multiplied by 9mm of silicone tube.
Further, the connected system includes anode chamber communicating pipe, cathode chamber communicating pipe, ion exchange membrane, hasp, and two passageways are located two electrode compartment lateral walls, and the passageway external diameter is 30mm, internal diameter 15mm, and 20mm apart from the electrolytic cell bottom of the pool is located at the passageway bottom, for the ion exchange between realization abiotic anode chamber and the biological cathode chamber, puts ion exchange membrane between anode chamber communicating pipe and cathode chamber communicating pipe, and the hasp presss from both sides two communicating pipes tightly, guarantees the leakproofness, avoids electrolyte to spill.
Furthermore, the three-electrode system comprises a counter electrode hole, a counter electrode, a reference electrode hole, a reference electrode, a working electrode hole, a working electrode and a potentiostat, a counter electrode hole is positioned on the anode chamber sealing cover, a counter electrode extends into the anode electrolytic cell body through the electrode hole, a reference electrode hole and a working electrode hole are positioned on the cathode chamber sealing cover, a reference electrode extends into the cathode electrolytic cell body through the reference electrode hole, a working electrode extends into the cathode electrolytic cell body through the working electrode hole, the working electrode provides electrons for microorganisms on the surface of the electrode, simultaneously, the carrier is used as a carrier for the growth of the carbon-fixing microbial film, in order to provide a good channel for proton transfer, the bottoms of the counter electrode, the reference electrode and the working electrode are all positioned on the same horizontal line with the communicating pipe, and three connectors of the potentiostat are respectively connected with the three electrodes.
Further, the gas outlet system comprises: the air outlet comprises a first air outlet hole, a second air outlet hole, a first air outlet hose, a second air outlet hose and an air bag, wherein the first air outlet hole is located on an anode chamber sealing cover, the second air outlet hole is located on a cathode chamber sealing cover, the diameter of the first air outlet hole and the diameter of the second air outlet hole are both 6mm, the first air outlet hose and the second air outlet hose are both silica gel tubes with the specification of 3 x 5mm, in order to facilitate gas discharge, the first air outlet hose is introduced into the top of the anode electrolytic cell body through the first air outlet hole, the second air outlet hose is introduced into the top of the cathode electrolytic cell body through the second air outlet hole, in order to collect gas generated by biological cathode chamber reaction, the outlet of the air outlet hose is connected with the air bag used for collecting gas generated after reaction, the inner diameter of the tube is 5mm, and the inner diameter of the ball is 100 mm.
Further, the anolyte in the non-biological anode chamber is a prepared phosphate buffer solution, and comprises the following components in parts by weight: potassium dihydrogen phosphate (6.8g/L) and NaOH (0.9 g/L).
Furthermore, the catholyte in the biological cathode chamber is a microbial inoculant and a culture medium, and the microbial inoculant is obtained from an SBR process A2The active sludge of the microorganism treatment process such as O process and AO process, the components and the ratio of the culture medium are shown in Table 1, the culture medium needs to be autoclaved, and the active sludge can be inhibitedAdding a 2-bromoethyl sodium sulfonate solution generated by methanogen into a culture medium, then adding the culture medium into a biological cathode chamber, and then inoculating a certain amount of activated sludge into the biological cathode chamber.
TABLE 1 composition of culture Medium
The invention also provides a method for fixing carbon dioxide by driving microorganisms with electric energy by using the device, which comprises the following steps:
s1: pouring the anolyte into the anode electrolytic cell body, and screwing down the anode chamber sealing cover at the upper end of the anode electrolytic cell body;
s2: opening a first inlet hose and a first outlet hose of the anode chamber, allowing nitrogen to enter the cell body of the anode electrolytic cell through the inlet hose of the anode chamber, stopping gas supply after aerating for a period of time, closing the first outlet hose, and then closing the inlet hose of the anode chamber;
s3: pouring culture medium and activated sludge into a cathode electrolytic cell body in sequence according to a certain proportion, and screwing a cathode chamber sealing cover at the upper end of the cathode electrolytic cell body;
s4: opening a cathode chamber air inlet hose and an air outlet hose II, allowing factory waste gas containing high-concentration carbon dioxide or purified carbon dioxide gas to enter a cathode electrolytic cell body through the cathode chamber air inlet hose, stopping air supply after aerating for a period of time, closing the cathode chamber air inlet hose, and connecting an air bag to the air outlet hose II;
s5: connecting the potentiostat with the three electrodes by using the potentiostat as an external power supply, and turning on the power supply;
s6: under the conditions of electric energy drive and carbon source addition, the carbon-fixing microorganisms form a microbial film on the surface of the working electrode, and as a biocatalyst, carbon dioxide is reduced into organic chemicals under the action of the carbon-fixing microorganisms, such as: methane, formic acid, acetic acid, etc.;
s7: gas generated after reaction in the cell body of the cathode electrolytic cell enters the air bag through the second gas outlet hose, and collected gas of the air bag is sampled;
s8: organic matters generated after reaction in the cell body of the cathode electrolytic cell are dissolved in the catholyte, after the reaction is carried out for a certain period, the power supply is cut off, the sealing cover of the cathode chamber is opened, and the catholyte is sampled.
Advantageous effects
1. According to the device and the method for fixing carbon dioxide by using activated sludge coupled electric energy to drive microorganisms, factory waste gas containing carbon dioxide with higher concentration or carbon dioxide after separation and purification is used as a carbon source required by growth of carbon-fixing microorganisms, so that a new purpose is provided for carbon dioxide, and the emission reduction of carbon dioxide is promoted;
2. according to the device and the method for fixing carbon dioxide by using activated sludge coupled electric energy to drive microorganisms, the activated sludge is used as an inoculant of a microbial catalyst, and the carbon fixing cost is reduced by using the advantages of wide source of the activated sludge and rich microbial population;
3. according to the device and the method for fixing carbon dioxide by using activated sludge coupled electric energy to drive microorganisms, the carbon fixing performance of the carbon fixing microorganisms is improved by the external power supply, the growth of the carbon fixing microorganisms in the activated sludge is promoted, and the device and the method for fixing carbon dioxide are economical and effective;
4. according to the device and the method for fixing carbon dioxide by using activated sludge coupled electric energy to drive the microorganisms, the type of the microorganism inoculant and the electrode material can be replaced according to the needs.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a block diagram of two electrode compartments of the present invention;
FIG. 3 is a view of a non-biological anode chamber according to the present invention;
FIG. 4 is a structural view of a biological cathode chamber according to the invention;
FIG. 5 is a block diagram of the gas inlet and outlet system of the present invention;
the device comprises an anode electrolytic cell body 1, an anode chamber sealing cover 2, a cathode electrolytic cell body 3, a cathode chamber sealing cover 4, an anode chamber air inlet 5, a cathode chamber air inlet 6, an anode chamber air inlet hose 7, a cathode chamber air inlet hose 8, an anode chamber communicating pipe 9, a cathode chamber communicating pipe 10, an ion exchange membrane 11, a lock catch 12, a counter electrode hole 13, a counter electrode 14, a reference electrode 15, a reference electrode 16, a working electrode 17, a working electrode 18, a potentiostat 19, a gas outlet hole I20, a gas outlet hole II 21, a gas outlet hole II 22, a gas outlet hose I23, a gas outlet hose II 24 and an air bag.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Example 1
As shown in fig. 2, the present embodiment is an electrode chamber structure of an activated sludge-coupled device for driving microorganisms to fix carbon dioxide by electric energy, comprising:
the non-biological anode chamber is used for providing an electrochemical reaction site, wherein an anode electrolytic cell body 1 is a cylindrical glass bottle, the diameter of the bottle body is 60mm, the height of the bottle body is 80mm, the working volume of the bottle body is 200ml, a threaded opening is formed in the top of the bottle body, 180ml of anolyte is contained in the cell body 1, an anode chamber sealing cover 2 is adopted for maintaining a sealing environment, the anode chamber sealing cover 2 is made of polytetrafluoroethylene and has good chemical stability, and the anode chamber sealing cover 2 is provided with a threaded opening;
the biological cathode chamber is used for providing a microbial electrochemical reaction field, wherein a cathode electrolytic cell body 3 is a cylindrical glass bottle, the diameter of the bottle body is 60mm, the height of the bottle body is 80mm, the working volume is 200ml, a threaded opening is formed in the top of the bottle body, 180ml of cathode electrolyte is contained in the cell body 3, in order to maintain a sealed environment, a cathode chamber sealing cover 4 is adopted and made of polytetrafluoroethylene, the chemical stability is good, and the cathode chamber sealing cover 4 is provided with a threaded opening;
a connected system for providing ion transmission passageway, wherein, anode chamber communicating pipe 9 and cathode chamber communicating pipe 10 are located the lateral wall of anode electrolysis cell body 1 and cathode electrolysis cell body 3 respectively, and the height and the diameter of two passageways are the same, and the passageway internal diameter is 15mm, and the external diameter is 30mm, and passageway bottom is apart from the electrolytic cell bottom of the pool 20mm, puts ion exchange membrane 11 between anode chamber communicating pipe 9 and cathode chamber communicating pipe 10, and reuse hasp 12 presss from both sides two communicating pipes tightly.
The assembly of the two electrode chambers comprises the following steps:
s1, placing the anode chamber communicating pipe 9 and the cathode chamber communicating pipe 10 oppositely;
s2, cutting the ion exchange membrane 11 into a circular piece with the diameter of 28mm, and placing the circular piece between the anode chamber communicating pipe 9 and the cathode chamber communicating pipe 10;
s3, clamping the two communicating pipes by using the lock catch 12, screwing the screw on the lock catch 12 to the tightest, ensuring the sealing performance of the communicating system and avoiding the leakage of electrolyte;
s4, preparing a phosphate buffer solution as an anolyte, wherein the anolyte comprises the following components in parts by weight: adding 180ml of prepared solution into an anode electrolytic cell body 1 of monopotassium phosphate (6.8g/L) and NaOH (0.9 g/L);
s5, preparing a catholyte, wherein the catholyte is a mixed solution of a culture medium and an inoculant, the components and the proportion of the culture medium are shown in Table 1, the prepared culture medium is sterilized by high-pressure steam at 121 ℃ for 30min, 10mM 2-bromoethyl sodium sulfonate solution is added into the culture medium after the temperature is reduced to room temperature, then 160ml of the culture medium is added into a cathode electrolytic cell body 3, and 20ml of activated sludge is added as the inoculant;
and S6, screwing the sealing covers 2 and 4 on the two electrode chambers to finish the installation of the electrode chambers.
Example 2
As shown in fig. 3, this embodiment is an air inlet and outlet system of an activated sludge coupled electric energy driven microorganism carbon dioxide fixing device, comprising:
an anode chamber air inlet 5, a cathode chamber air inlet 6, an anode chamber air inlet hose 7 and a cathode chamber air inlet hose 8 which are used for providing an air inlet passage, wherein the two air inlets 5 and 6 are respectively positioned on an anode chamber sealing cover 2 and a cathode chamber sealing cover 4, the diameters of the two air inlets are both 9mm, the air inlet hoses are silicone tubes with the diameters of 6 multiplied by 9mm, and the distribution positions of the air inlets are shown in figure 3;
the air outlet structure comprises a first air outlet hole 20, a second air outlet hole 21, a first air outlet hose 22 and a second air outlet hose 23, wherein the first air outlet hole 20, the second air outlet hole 21, the first air outlet hose 22 and the second air outlet hose 23 are used for providing air outlet passages, the two air outlet holes 20 and 21 are respectively positioned in an anode chamber sealing cover 2 and a cathode chamber sealing cover 4, the diameters of the two air outlet holes are both 5mm, the two air outlet hoses are both 3 x 5mm silica gel tubes, and the distribution positions of the air outlet holes are shown in figure 3;
an air bag 24 for collecting reaction gas, the inner diameter of the tube was 5mm, and the inner diameter of the sphere was 100 mm.
The gas circuit operation method comprises the following steps:
s1, plugging the air inlet hoses 7 and 8 into the air inlet holes 5 and 6, wherein the distance between the hoses and the bottom of the tank is 10 mm;
s2, plugging air outlet hoses 22 and 23 into the air outlet holes 20 and 21, and introducing the air outlet hoses into the top of the electrolytic cell body;
s3, opening the air inlet hoses 7 and 8 and the air outlet hoses 22 and 23 to discharge oxygen in the electrode chambers, introducing nitrogen into the two electrode chambers through the air inlet hoses 7 and 8, aerating for 20min, and sequentially sealing the air outlet hose 22 and the air inlet hose 7 by using clamps;
s4, after nitrogen aeration is finished, supplying gas containing carbon dioxide to the cathode electrolytic cell body 3 through the gas inlet hose 8, keeping the gas outlet hose 23 in an open state, after aeration is carried out for 10min, connecting the air bag to the outlet of the gas outlet hose 23 for aeration for 10min to collect gas products generated by reaction, and sealing the gas inlet hose 8 after the air bag is full of air.
Example 3
As shown in fig. 4, this embodiment is a three-electrode system of an activated sludge-coupled electric energy-driven microorganism carbon dioxide fixation device, the system includes:
the electrode assembly comprises a counter electrode hole 13, a reference electrode hole 15 and a working electrode hole 17 which are used for providing electrode mounting positions, wherein the counter electrode hole 13 is positioned in an anode chamber sealing cover 2, the reference electrode hole 15 and the working electrode hole 17 are positioned in a cathode chamber sealing cover 4, the three electrode holes are the same in size, the pore diameter is 6mm, and the distribution positions of the electrode holes are shown in figure 4;
the counter electrode 14 is a platinum sheet electrode, the counter electrode extends into the anode electrolytic cell body 1 through a counter electrode hole 13, the platinum sheet electrode is 10mm multiplied by 0.1mm in size, the reference electrode 16 is a silver/silver chloride electrode, the counter electrode hole 15 extends into the cathode electrolytic cell body 3, the working electrode 18 is a carbon felt electrode or a glassy carbon electrode, the electrode piece is 10mm multiplied by 0.1mm in size, and the working electrode hole 17 extends into the cathode electrolytic cell body 3.
The starting method of the three-electrode system comprises the following steps:
s1, extending the three electrodes 14, 16 and 18 into the anode electrolytic cell body 1 and the cathode electrolytic cell body 3 through the corresponding electrode holes 13, 15 and 17,
s2, adjusting the heights of the three electrodes 14, 16 and 18, wherein the channels formed by the electrode plates and the communicating pipes 9 and 10 are positioned on the same horizontal line;
and S3, connecting three connectors of the potentiostat 19 with three electrodes respectively, setting the required potential, and turning on the power supply to realize the current supply.
Example 4
As shown in fig. 5, the present embodiment is a method for fixing carbon dioxide in an activated sludge coupled electric energy driven microorganism carbon dioxide fixing device, wherein carbon dioxide fixing occurs in a biological cathode chamber, comprising the following steps:
s1, introducing the gas containing carbon dioxide into the biological cathode chamber through a cathode chamber gas inlet hose 8, and aerating according to the method in the example 2 to ensure that the reaction gas fills the cathode electrolytic cell body 3;
s2, in the non-biological anode chamber, the surface of the counter electrode 14 is oxidized, the electrolyzed water generates hydrogen ions, the hydrogen ions enter the cathode electrolytic cell body 3 through the communicating system,
s3, according to the embodiment 3, a power supply of the constant potential rectifier 19 is turned on, a certain voltage is applied to the system, under the condition that electrons and a carbon source are supplied, the carbon-fixing microorganisms in the activated sludge are gradually attached to the working electrode 18 to form a biological film, and under the metabolic action of the carbon-fixing microorganisms, the surface of the working electrode 18 is subjected to a reduction reaction of carbon dioxide to generate organic products such as acetic acid and the like, so that the fixation of the carbon dioxide is realized.
Claims (10)
1. A device for fixing carbon dioxide by microorganisms driven by activated sludge coupled electric energy mainly comprises a non-biological anode chamber, a biological cathode chamber, an air inlet system, a communication system, a three-electrode system and an air outlet system;
the method is characterized in that: the biological cathode chamber is internally provided with catholyte, the non-biological anode chamber is internally provided with anolyte, gas participating in reaction enters the reaction device through the gas inlet system, so that the biological cathode chamber and the non-biological anode chamber are filled with gas, the gas is factory waste gas containing high-concentration carbon dioxide, purified carbon dioxide or nitrogen, the non-biological anode chamber and the biological cathode chamber are connected through the communication system to realize proton transfer, the three-electrode system provides electric energy required by the reaction and a carrier of a microbial catalyst biofilm, and the gas generated after the reaction is collected through the gas outlet system.
2. The activated sludge coupled electric energy driven microorganism carbon dioxide sequestration apparatus of claim 1 wherein: the non-biological anode chamber comprises an anode electrolytic cell body (1) and an anode chamber sealing cover (2), wherein the anode chamber sealing cover (2) is arranged at the upper end of the anode electrolytic cell body (1).
3. The activated sludge coupled electric energy driven microorganism carbon dioxide fixation device of claim 2, wherein: the biological cathode chamber comprises a cathode electrolytic cell body (3) and a cathode chamber sealing cover (4), and the cathode chamber sealing cover (4) is arranged at the upper end of the cathode electrolytic cell body (3).
4. The activated sludge coupled electric energy driven microorganism carbon dioxide fixation device of claim 3, wherein: air intake system includes anode chamber inlet port (5), cathode chamber inlet port (6), anode chamber air inlet hose (7), cathode chamber air inlet hose (8), and anode chamber inlet port (5) are located the sealed lid of anode chamber (2), and cathode chamber inlet port (6) are located the sealed lid of cathode chamber (4), and anode chamber air inlet hose (7) let in anode electrolytic cell body (1) bottom through anode chamber inlet port (5), and cathode chamber air inlet hose (8) let in cathode electrolytic cell body (3) bottom through cathode chamber inlet port (6).
5. The activated sludge coupled electric energy driven microorganism carbon dioxide sequestration apparatus of claim 1 wherein: the communicating system comprises an anode chamber communicating pipe (9), a cathode chamber communicating pipe (10), an ion exchange membrane (11) and a lock catch (12), wherein the ion exchange membrane (11) is placed between the anode chamber communicating pipe (9) and the cathode chamber communicating pipe (10), and the two communicating pipes are clamped by the lock catch (12).
6. The activated sludge coupled electric energy driven microorganism carbon dioxide fixation device of claim 3, wherein: the three-electrode system comprises a counter electrode hole (13), a counter electrode (14), a reference electrode hole (15), a reference electrode (16), a working electrode hole (17), a working electrode (18) and a potentiostat (19), a counter electrode hole (13) is positioned on the anode chamber sealing cover (2), a counter electrode (14) extends into the anode electrolytic cell body (1) through the electrode hole (13), a reference electrode hole (15) and a working electrode hole (17) are positioned on the cathode chamber sealing cover (4), a reference electrode (16) extends into the cathode electrolytic cell body (3) through the reference electrode hole (15), a working electrode (18) extends into the cathode electrolytic cell body (3) through the working electrode hole (17), the bottoms of the counter electrode (14), the reference electrode (16) and the working electrode (18) are all positioned on the same horizontal line with the communicating pipe.
7. The activated sludge coupled electric energy driven microorganism carbon dioxide sequestration apparatus of claim 1 wherein: the air outlet system comprises: the gas outlet structure comprises a first gas outlet hole (20), a second gas outlet hole (21), a first gas outlet hose (22), a second gas outlet hose (23) and a gas bag (24), wherein the first gas outlet hole (20) is located on the anode chamber sealing cover (2), the second gas outlet hole (21) is located on the cathode chamber sealing cover (4), the first gas outlet hose (22) is introduced into the top of the anode electrolytic cell body (1) through the first gas outlet hole (20), the second gas outlet hose (23) is introduced into the top of the cathode electrolytic cell body (3) through the second gas outlet hole (21), and the outlet of the gas outlet hose (23) is connected with the gas bag (24) used for collecting gas generated after reaction.
8. The activated sludge coupled electric energy driven microorganism carbon dioxide sequestration apparatus of claim 1 wherein: the anolyte in the non-biological anode chamber is prepared buffer solution.
9. The activated sludge coupled electric energy driven microorganism carbon dioxide sequestration apparatus of claim 1 wherein: the cathode electrolyte in the biological cathode chamber is a microbial inoculant and a culture medium, and the microbial inoculant comes from an SBR process A2Activated sludge of microorganism treatment processes such as O process, AO process and the like.
10. A method for fixing carbon dioxide by driving microorganisms with electric energy by using the device of any one of claims 1 to 9, comprising the steps of:
s1: pouring the anolyte into the anode electrolytic cell body (1), and screwing down the anode chamber sealing cover (2) at the upper end of the anode electrolytic cell body (1);
s2: opening an air inlet hose (7) and an air outlet hose (22), introducing nitrogen into the anode electrolytic cell body (1) through the air inlet hose (7), stopping supplying air after aerating for a period of time, sealing the air outlet hose (22) and then sealing the air inlet hose (7);
s3: pouring a culture medium and activated sludge into a cathode electrolytic cell body (3) in sequence according to a certain proportion, and screwing a cathode chamber sealing cover (4) at the upper end of the cathode electrolytic cell body (3);
s4: opening an air inlet hose (8) and an air outlet hose (23), introducing factory waste gas containing high-concentration carbon dioxide or purified carbon dioxide gas into the cathode electrolytic cell body (1) through the air inlet hose (8), stopping gas supply after aerating for a period of time, sealing the air inlet hose (8), and connecting an air bag (24) to the air outlet hose (23);
s5: connecting the potentiostat (19) with the three electrodes by using the potentiostat (19) as an external power supply, and turning on the power supply;
s6: under the conditions of electric energy drive and carbon source addition, the carbon-fixing microorganisms form a microbial film on the surface of the working electrode (18) and are used as a biocatalyst, and carbon dioxide is reduced into an organic chemical under the action of the carbon-fixing microorganisms;
s7: gas generated after reaction in the cathode electrolytic cell body (3) enters the air bag (24) through the air outlet hose (23), and collected gas of the air bag is sampled;
s8: organic matters generated after reaction in the cathode electrolytic cell body (3) are dissolved in the cathode electrolyte, after the reaction is carried out for a certain period, the power supply is cut off, the sealing cover (4) of the cathode chamber is opened, and the cathode electrolyte is sampled.
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| CN115646141A (en) * | 2022-09-29 | 2023-01-31 | 中国化学工程第六建设有限公司 | Sewage treatment method for reducing carbon emission |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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