CN117065560B - Cathode slow down high CO based on hydrophobic membrane 2 Device and method for inhibiting microalgae from fixing carbon - Google Patents
Cathode slow down high CO based on hydrophobic membrane 2 Device and method for inhibiting microalgae from fixing carbon Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—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
- 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
- B01D53/326—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 in electrochemical cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention relates to the technical field of carbon capture and sewage treatment, in particular to a cathode-based hydrophobic membrane for retarding high CO 2 The device comprises an electrolytic cell reactor, and a hydrophobic membrane cathode and an anode which are arranged in the electrolytic cell reactor at intervals, wherein a microalgae and ammonia nitrogen wastewater mixed solution is filled between the electrolytic cell reactors, and the hydrophobic membrane cathode and the anode form a loop through an external power supply. The hydrophobic membrane electrode of the invention is externally communicated with CO 2 And synchronously realize the production of OH ‑ The microalgae system is prevented from being acidified too quickly, the pH is maintained to be stable, and the method is an important factor for guaranteeing the ammonia nitrogen removal efficiency and the self-growth requirement of the microalgae; no buffer is needed to be added, and the high-carbon can be treated>15%) of industrial flue gas; the hydrophobic membrane cathode alleviating microalgae solution acidification system is efficient and stable, and can realize synchronous treatment of high ammonia nitrogen wastewater and CO 2 Fixing and harvesting microalgae biomass.
Description
Technical Field
The invention relates to the technical field of carbon capture and sewage treatment, in particular to a cathode-based high CO retarding hydrophobic membrane 2 A device and a method for inhibiting microalgae from solidifying carbon.
Background
The recycling of carbon dioxide is the focus of current industry attention, on the one hand because of the many bad effects caused by global warming; on the other hand, carbon dioxide as a feedstock may produce a more cost effective product than conventional hydrocarbons. This, therefore, provides new power and challenges for developing more efficient, environmentally friendly Carbon dioxide Capture, sequestration and utilization technologies (CCUS).
CCUS is largely divided into three types, physical, chemical and biological transformations. The special properties exhibited by carbon dioxide in the supercritical state have led to a great deal of variation in the field of energy development over the last decadesVarious colors can also realize yield increase through carbon dioxide drive for various types of oil gas. In the field of organic synthesis, carbon dioxide can also produce high-value-added organic chemical products. Both methods can reduce the emission of carbon dioxide gas to achieve the aim of changing waste into valuables, but the method mainly focuses on the utilization of the captured carbon dioxide. Bioconversion differs from the other two methods in that carbon can be directly fixed, and carbon dioxide is converted into biomass of green plants and microalgae through photosynthesis. Compared with green plants, the microalgae has higher biological light efficiency and strong fertility and adaptability, and is an unprecedented medium for efficiently realizing carbon dioxide conversion and recycling. It is well documented that microalgae biomass of 1. 1 kg can immobilize 1.83 kg CO 2 . In addition, the microalgae biomass can be widely applied to various fields, and the produced lipid, vitamins, proteins and various pigments can be applied to the fields of foods, feeds, biofuels, medical products and the like.
Compared with the natural growth condition of microalgae, the industrial flue gas is rich in CO with high concentration 2 And toxic and harmful substances, which can adversely affect the growth and survival of the plants. Therefore, if the carbon fixation efficiency of the microalgae is further improved, the carbon fixation efficiency of the microalgae on high-concentration CO is improved 2 The adaptability of (c) is critical. At present, the common means for solving the problem of high carbon inhibition is CO 2 Concentration gradient multicycle domestication and mutagenesis screen higher tolerance plants, but the genetic characters obtained by the methods are unstable. In addition, the characteristics of algal strains can be modified by genetic engineering means, and important developments in recent years include: first, by blocking CCM mechanism to prevent acidification of intracellular environment, CO is reduced 2 A resulting inhibitory effect; secondly, increase H + Pump for preventing high concentration CO 2 Dissolved in water to cause H + Excessive accumulation in the cell can increase biomass yield in high carbon environments. However, genetic engineering is a high-cost and long-period technology, and the tolerating effect is only that of medium-low-grade CO 2 Conditions (5% CO) 2 ) The following is verified, which cannot really solve the problem of high concentration CO 2 Industrial waste gas.
Regulating the growth environment of microalgae can slow down high CO 2 Inhibiting carbon sequestration of microalgaeMeasures are taken. CN202210107541.9 discloses a method for electrochemically promoting nannochloropsis to fix high concentration in flue gas, and the method can effectively improve the high concentration of CO in flue gas of power plant by using the electrochemical treatment method 2 The growth carbon fixation rate is lower, thereby improving the yield of biomass. Although the method converts inorganic carbon into biomass to CO 2 The purpose of resource conversion, however, is still unable to solve the problem of high concentration CO 2 Causing problems of lowering the pH of the solution. It is studied that severe cytoplasmic acidification is the main cause of the observed impairment of cell proliferation rate under high concentration of acid gas, and the water body of peracid may directly destroy the cell structure from the outside, which is inconvenient for sustainable development of microalgae carbon fixation technology.
Therefore, the development of a device and a method for preventing the acidification of the culture solution is of great significance, which is beneficial to accelerating CO based on microalgae 2 Development and industrial application of trapping and resource utilization technology.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a cathode based on hydrophobic membrane for mitigating high CO 2 A device and a method for inhibiting microalgae carbon fixation aim to solve the problem of low microalgae carbon fixation efficiency caused by the influence of culture solution acidification on microalgae.
The technical scheme of the invention is as follows:
cathode slow down high CO based on hydrophobic membrane 2 The device for inhibiting carbon fixation of microalgae comprises an electrolytic cell reactor, an anode and a hydrophobic membrane cathode which are arranged in the electrolytic cell reactor at intervals, a power supply which is positioned outside the electrolytic cell reactor and is electrically connected with the anode and the hydrophobic membrane cathode, and carbon dioxide supply equipment which is communicated with the hydrophobic membrane cathode and is used for outputting carbon dioxide; the electrolytic cell reactor is provided with a water inlet communicated with an external wastewater tank, an internal circulation water outlet and an internal circulation water inlet communicated through a pipeline, and a circulation pump is arranged on the pipeline; the hydrophobic film cathode consists of a hydrophobic film support and conductive substances sprayed on the hydrophobic film support, wherein the hydrophobic film support is a porous filmThe hydrophobic membrane cathode is provided with the air inlet with the one end that supplies carbon dioxide equipment to communicate, the hydrophobic membrane cathode is kept away from the one end that supplies carbon dioxide equipment is provided with the gas outlet.
The cathode based on the hydrophobic membrane slows down high CO 2 The device for inhibiting carbon fixation of microalgae comprises a carbon cloth, a graphite rod, foam graphite, a platinum sheet, a titanium sheet and Ti 4 O 7 One of them.
The cathode based on the hydrophobic membrane slows down high CO 2 The device for inhibiting carbon fixation of microalgae is characterized in that the material of the hydrophobic membrane support is one or more of tetrafluoroethylene, polyvinylidene fluoride and polypropylene.
The cathode based on the hydrophobic membrane slows down high CO 2 The device for inhibiting carbon fixation of microalgae comprises a conductive substance, wherein the conductive substance is one or more of carbon nanotubes, carbon nanoplatelets, metal nanoparticles and conductive organic polymers.
The cathode based on the hydrophobic membrane slows down high CO 2 The device for inhibiting carbon fixation of microalgae is characterized in that a timing exhaust device is externally connected with the cathode of the hydrophobic membrane.
The cathode based on the hydrophobic membrane slows down high CO 2 And the position of the inner circulation water outlet is higher than that of the inner circulation water inlet.
The cathode based on the hydrophobic membrane slows down high CO 2 The device for inhibiting carbon fixation of microalgae comprises one or more of Chlorella vulgaris, spirulina, arthrospira platensis and Chlorella pyrenoidosa.
The cathode based on the hydrophobic membrane slows down high CO 2 The device for inhibiting carbon fixation of microalgae comprises a carbon dioxide cylinder, a pressure reducing valve, a flowmeter and an air pipe.
Cathode slow down high CO based on hydrophobic membrane 2 Method for inhibiting carbon fixation of microalgae, which is based on hydrophobic membrane cathode for slowing down high CO 2 The device for inhibiting carbon fixation of microalgae comprises the following steps:
the mixed solution composed of microalgae and sewage containing high ammonia nitrogen is input from a water inlet, and bacterial solution mixing is realized through a circulating pump;
CO input to hydrophobic membrane cathode through carbon dioxide supply device 2 The CO 2 The water layer dissolved on the surface of the hydrophobic membrane cathode generates H 2 CO 3 Providing an inorganic carbon source necessary for the growth of microalgae and the treatment of sewage containing high ammonia nitrogen;
under the action of voltage, the cathode electrochemical reaction of the hydrophobic membrane generates a large amount of OH − The pH near the cathode of the hydrophobic membrane is raised to capture excess H + Drive H 2 O and H 2 CO 3 Ionization balance and leftward shift of (a), and stable formation of HCO 3 − Slow down high CO 2 Inhibiting effect and improving carbon fixation efficiency of microalgae.
The cathode based on the hydrophobic membrane slows down high CO 2 A method for inhibiting carbon fixation of microalgae, wherein the current density between the anode and the cathode of the hydrophobic membrane is maintained at 10-50A m under the action of voltage −2 Between them.
The beneficial effects are that: during operation, the hydrophobic membrane cathode in the invention continuously releases hydroxyl to neutralize CO dissolved in water 2 Overcomes the defect of capturing CO by microalgae 2 Acidification problems in the process; the pH change is not required to be observed by using real-time monitoring equipment, and alkali is not required to be additionally added to adjust the pH, so that the construction cost of the device is greatly reduced, the device is convenient to manage, and the possibility is provided for removing high-concentration carbon dioxide; the cathode of the hydrophobic membrane adopts a bubble-free aeration operation mode to increase CO 2 Solubility, promote CO 2 Conversion to HCO 3 − The utilization efficiency is improved, the photosynthetic efficiency of the microalgae is increased, the final biomass yield of the microalgae is improved, the energy consumption cost required by aeration is low, and the running cost for treating sewage is greatly reduced; the constructed hydrophobic membrane cathode provides a medium for microalgae growth, so that the biological density is greatly improved, and the denitrification effect is stable; in the electricity generation process, microalgae are adsorbed on membrane wires by utilizing the existence of a weak electric field, so that the generation of membrane pollution is delayed, and the subsequent microalgae acquisition is facilitated; the invention adopts the hydrophobic film with conductive performance, thereby combining the aeration biological film component with the anode electrode, organically combining the film aeration biological film with electrochemistry, and integrating the film aeration biological film with the electrochemistryThe design is simpler, convenient management.
Drawings
FIG. 1 shows a cathode for reducing high CO based on a hydrophobic membrane according to the present invention 2 Schematic structural diagram of device for inhibiting carbon fixation of microalgae.
FIG. 2 is a graph showing the results of the ammonia nitrogen removal rate test of example 1 and comparative example 1.
Detailed Description
The invention provides a cathode slow down high CO based on a hydrophobic membrane 2 The device and the method for inhibiting the carbon fixation of the microalgae are used for making the purposes, the technical scheme and the effects of the invention clearer and more definite, and the invention is further described in detail below. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 shows a cathode for reducing high CO based on a hydrophobic membrane according to the present invention 2 The device for inhibiting carbon fixation of microalgae is shown in a structural schematic diagram, and comprises an electrolytic cell reactor 8, an anode 7 and a hydrophobic membrane cathode 6 which are arranged in the electrolytic cell reactor 8 at intervals, a power supply 4 which is positioned outside the electrolytic cell reactor 8 and is electrically connected with the anode 7 and the hydrophobic membrane cathode 6, and a carbon dioxide supply device 1 which is communicated with the hydrophobic membrane cathode 6 and is used for outputting carbon dioxide; the electrolytic cell reactor 8 is provided with a water inlet 12 communicated with an external wastewater tank 11, an internal circulation water outlet 3 and an internal circulation water inlet 2 which are communicated through a pipeline, and a circulation pump 10 is arranged on the pipeline; the hydrophobic membrane cathode 6 comprises a hydrophobic membrane support body 5 and conductive substances sprayed on the hydrophobic membrane support body 5, an air inlet 13 is formed in one end, communicated with the carbon dioxide supply device 1, of the hydrophobic membrane cathode 6, and an air outlet 9 is formed in one end, far away from the carbon dioxide supply device 1, of the hydrophobic membrane cathode 6.
The invention is based on hydrophobic membrane cathode to slow down high CO 2 The basic principle of the technology of the device for inhibiting microalgae carbon fixation is as follows: high concentration CO 2 Introducing into a hydrophobic membrane cathode for aeration, and growing microalgae by using inorganic carbon. Due to high concentration of CO 2 Dissolving in water to obtain carbonic acid (H) 2 CO 3 Equation 1), CO 2 The continued accumulation shifts the ionization balance to the right, producing H + Leading to acidification of the system (formulas 2, 3); under the action of voltage, the surface of the cathode of the hydrophobic membrane is subjected to water reduction reaction, and hydroxyl (OH) − ) Accumulation on the surface of the hydrophobic membrane electrode results in a local pH rise (equation 4), shifting the ionization balance to the left, and H + The combination prevents the system from generating harmful effect on microalgae due to acidification; on the other hand, microalgae mainly utilize CO 2 And bicarbonate (HCO) 3 − ) The left shift of ionization balance greatly increases the CO of microalgae 2 Absorption efficiency of molecules.
In particular, conventional biological capture processes can only handle low CO 2 Concentration [ (]<15% v/v) and the concentration of industrial fumes ranges from 10% to 99%, the effect of high concentration fumes on microalgae mainly results from the damage of cell structures by acidification. During operation, the hydrophobic membrane cathode in the invention continuously releases hydroxyl to neutralize CO dissolved in water 2 Overcomes the defect of capturing CO by microalgae 2 Acidification problems in the process; the invention does not need to use real-time monitoring equipment to observe pH change, and does not need to additionally add alkali to adjust pH, thereby greatly reducing the construction cost of the device, being convenient to manage and providing possibility for removing high-concentration carbon dioxide. The hydrophobic membrane cathode adopts a bubble-free aeration operation mode, and increases CO 2 Solubility, promote CO 2 Conversion to HCO 3 − The utilization efficiency is improved, the photosynthetic efficiency of the microalgae is increased, the final biomass yield of the microalgae is improved, the energy consumption cost for aeration is low, and the running cost for sewage treatment is greatly reduced. The hydrophobic membrane cathode constructed by the invention provides a medium for microalgae growth, so that the biological density is greatly improved, and the denitrification effect is stable; in the electricity generating process, the microalgae are adsorbed on the membrane wires by utilizing the existence of a weak electric field, so that the generation of membrane pollution is delayed, and the subsequent microalgae collection is facilitated. The invention also adopts a hydrophobic membrane with conductivity, thereby combining the aeration biological membrane component with the anode electrode to lead the membrane to beThe aeration biological film and the electrochemistry are organically combined together, so that the whole design is simpler and the management is convenient.
In some embodiments, the anode is made primarily of carbon, metal or metal oxide as a substrate, including but not limited to carbon cloth, graphite rod, graphite foam, platinum sheet, titanium sheet or Ti 4 O 7 。
In some embodiments, the material of the hydrophobic membrane support is one or more of tetrafluoroethylene, polyvinylidene fluoride, and polypropylene, but is not limited thereto; the conductive substance is one or more of carbon nanotubes, carbon nanoplatelets, metal nanoparticles, and conductive organic polymers, but is not limited thereto.
In some embodiments, the hydrophobic membrane cathode is externally connected with a timing exhaust device, and the timing exhaust device exhausts for 1-20 minutes every 1 hour; preferably, the venting is for 2-10 minutes.
In some embodiments, the position of the internal circulation water outlet is higher than that of the internal circulation water inlet, as shown in fig. 1, an internal circulation water inlet is arranged below one side of the electrolytic cell reactor, an internal circulation water outlet is arranged above the other side of the electrolytic cell reactor, and the water inlet and the water outlet are connected with a circulation pump through an external pipeline, so that the solution in the reactor is uniformly mixed and algae is in a suspended state.
In some embodiments, the microalgae is one or more of chlorella vulgaris, spirulina, arthrospira platensis, and chlorella pyrenoidosa, but is not limited thereto.
In some embodiments, the carbon dioxide supply device consists of a carbon dioxide cylinder, a pressure reducing valve, a flow meter, and a gas pipe. The concentration of the carbon dioxide provided by the carbon dioxide supply equipment is 1% -100%, and the pressure of the carbon dioxide gas entering the cathode of the hydrophobic membrane is 5-30kPa.
In some embodiments, the wastewater introduced into the electrolytic cell reactor through the water inlet is wastewater containing high ammonia nitrogen, including but not limited to human urine, pig raising wastewater, chicken and duck raising wastewater and the like.
In some embodiments, there is also provided a hydrophobic membrane-based cathode mitigation of high CO 2 Method for inhibiting carbon fixation of microalgae, which is based on hydrophobic membrane cathode for slowing down high CO 2 The device for inhibiting carbon fixation of microalgae comprises the following steps:
the mixed solution composed of microalgae and sewage containing high ammonia nitrogen is input from a water inlet, and bacterial solution mixing is realized through a circulating pump;
CO input to hydrophobic membrane cathode through carbon dioxide supply device 2 The CO 2 The water layer dissolved on the surface of the hydrophobic membrane cathode generates H 2 CO 3 Providing an inorganic carbon source necessary for the growth of microalgae and the treatment of sewage containing high ammonia nitrogen;
under the action of voltage, the cathode electrochemical reaction of the hydrophobic membrane generates a large amount of OH − The pH near the cathode of the hydrophobic membrane is raised to capture excess H + Drive H 2 O and H 2 CO 3 Ionization balance and leftward shift of (a), and stable formation of HCO 3 − Slow down high CO 2 Inhibiting effect and improving carbon fixation efficiency of microalgae.
In this embodiment, the current density between the anode and the cathode of the hydrophobic membrane is maintained at 10-50A m under the action of voltage −2 Between them. In the method of the invention, the hydrophobic membrane electrode is externally connected with CO 2 And synchronously realize the production of hydrogen OH - The microalgae system is prevented from being acidified too quickly, the pH is maintained to be stable, and the method is an important factor for guaranteeing the ammonia nitrogen removal efficiency and the self-growth requirement of the microalgae; no buffer is needed to be added, and the high-carbon can be treated>15%) of industrial flue gas; the hydrophobic membrane cathode alleviating microalgae solution acidification system is efficient and stable, and can realize synchronous treatment of high ammonia nitrogen wastewater and CO 2 Fixing and harvesting microalgae biomass.
The invention is further illustrated by the following examples:
example 1
Cathode slow down high CO based on hydrophobic membrane 2 The method for inhibiting carbon sequestration of microalgae comprises the following steps:
in this example, the microalgae used was chlorella vulgaris (Chlorella vulgaris), and the high ammonia nitrogen wastewater used was human urine. The conductive hydrophobic membrane component is used as a cathode, graphite is used as an anode, and an external circuit is connected to form a system. The total volume of the constructed reactor is 4L, sewage containing human urine and microalgae is introduced into the reactor from a water inlet at a certain flow rate, and a circulating pump 10 is additionally arranged for circulation, so that the solution in the electrolytic cell is ensured to be uniformly mixed. The system was placed in an illumination incubator, the incubator was externally connected with a gas cylinder, and carbon dioxide with a volume fraction of 30% was introduced from the gas inlet at a gas supply pressure of 10 kPa.
Further, carbon nanotube conductive substances are covered on the outer sides of membrane wires of the hydrophobic membrane assembly, a hydrophobic membrane cathode assembly is constructed by taking PTFE as an adhesive, the number of the membrane wires is 3000, the base material is polyvinylidene fluoride, the membrane wires are preferably of a tubular structure, and carbon dioxide gas can pass through the membrane wires.
Further, the illumination incubator adopts intermittent irradiation film type for the LED lamp, and the light-dark ratio is 14:10, the average illumination intensity was 12000 lux and the temperature was 25 ℃.
Further, the current density provided by the external direct current power supply is 10-50A m −2 For example, 10, 20, 30, 40, 50 am −2 More preferably 30 to 50 am −2 。
Further, the ammonia nitrogen concentration of the human urine is 500-2200 mg L −1 For example, 600 mg L −1 、800 mg L −1 、1000 mg L −1 、1200 mg L −1 More preferably 800-2000 mg L −1 The method comprises the steps of carrying out a first treatment on the surface of the The ammonia nitrogen concentration is calculated by N element.
Example 2
Cathode slow down high CO based on hydrophobic membrane 2 The method for inhibiting carbon sequestration of microalgae comprises the following steps:
the apparatus and materials used in this example were the same as in example 1, except that pure carbon dioxide (100%) was used instead of 30% carbon dioxide for aeration. As a result, it was found that the ammonia nitrogen removal rate in example 2 was not greatly different from that in example 1.
Comparative example 1
Cathode slow down high CO based on hydrophobic membrane 2 Method for inhibiting microalgae from fixing carbon and bagThe method comprises the following steps:
the comparative example 1 was identical to the apparatus used in example 1, except that no external current source was used, and 30% by volume of CO was directly fed 2 Experiments were performed after adjusting the initial pH to 6.5-7.5, and the light intensity and temperature were consistent with example 1.
Comparative example 2
Cathode slow down high CO based on hydrophobic membrane 2 The method for inhibiting carbon sequestration of microalgae comprises the following steps:
the comparative example was identical to the apparatus used in example 2, except that no external current source was used, and CO was directly fed in a volume fraction of 100% 2 After the initial pH is adjusted to 6.5-7.5, experiments are carried out, and the illumination intensity and the temperature are consistent with those of the example 1; after two weeks of operation, the microalgae cause CO 2 Excessive acidification is dead, and the water body is odorous.
The efficiency of treating high ammonia nitrogen wastewater in example 1 and comparative example 1 was tested, the ammonia nitrogen concentration was calculated as N element, and the ammonia nitrogen removal rates of both were shown in fig. 2, and it can be seen from fig. 2 that the ammonia nitrogen removal rate in example 1 was significantly higher than that in comparative example 1.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (7)
1. Cathode slow down high CO based on hydrophobic membrane 2 The device for inhibiting carbon fixation of microalgae is characterized by comprising an electrolytic cell reactor, an anode and a hydrophobic membrane cathode which are arranged in the electrolytic cell reactor at intervals, a power supply which is positioned outside the electrolytic cell reactor and is electrically connected with the anode and the hydrophobic membrane cathode, and carbon dioxide supply equipment which is communicated with the hydrophobic membrane cathode and is used for outputting carbon dioxide; the electrolytic cell reactor is provided with a water inlet communicated with an external wastewater tank, an internal circulation water outlet and an internal circulation water inlet communicated through a pipeline, and a circulation pump is arranged on the pipeline; the hydrophobic propertyThe membrane cathode consists of a hydrophobic membrane support body and a conductive substance sprayed on the hydrophobic membrane support body, wherein an air inlet is formed at one end of the hydrophobic membrane cathode, which is communicated with carbon dioxide supply equipment, and an air outlet is formed at one end of the hydrophobic membrane cathode, which is far away from the carbon dioxide supply equipment; the material of the hydrophobic membrane support is one or more of tetrafluoroethylene, polyvinylidene fluoride and polypropylene; the conductive substance is one or more of carbon nano tubes, carbon nano sheets, metal nano particles and conductive organic polymers; the hydrophobic membrane cathode is externally connected with a timing exhaust device, and the timing exhaust device exhausts air for 2-10 minutes every 1 hour; the hydrophobic membrane cathode provides a medium for microalgae growth, and microalgae are adsorbed on the hydrophobic membrane cathode by using the existence of a weak electric field in the electricity generation process, so that the generation of membrane pollution is delayed and microalgae collection is facilitated; high CO 2 Inhibiting high CO in carbon sequestration of microalgae 2 The content of (2) is 100%.
2. The hydrophobic membrane-based cathode mitigation of high CO of claim 1 2 The device for inhibiting carbon fixation of microalgae is characterized in that the anode is made of carbon cloth, graphite rod, foam graphite, platinum sheet, titanium sheet and Ti 4 O 7 One of them.
3. The hydrophobic membrane-based cathode mitigation of high CO of claim 1 2 The device for inhibiting carbon fixation of microalgae is characterized in that the position of the inner circulation water outlet is higher than that of the inner circulation water inlet.
4. The hydrophobic membrane-based cathode mitigation of high CO of claim 1 2 The device for inhibiting carbon fixation of microalgae is characterized in that the microalgae is one or more of chlorella vulgaris, spirulina, arthrospira platensis and chlorella pyrenoidosa.
5. The hydrophobic membrane-based cathode mitigation of high CO of claim 1 2 The device for inhibiting microalgae carbon fixation is characterized in that the carbon dioxide supply equipment comprises a carbon dioxide gas cylinder, a pressure reducing valve, a flowmeter and a gas pipe groupAnd (3) forming the finished product.
6. Cathode slow down high CO based on hydrophobic membrane 2 Method for inhibiting carbon sequestration of microalgae using the hydrophobic membrane-based cathode according to any one of claims 1-5 to slow down high CO 2 The device for inhibiting carbon fixation of microalgae is characterized by comprising the following steps:
the mixed solution composed of microalgae and sewage containing high ammonia nitrogen is input from a water inlet, and bacterial solution mixing is realized through a circulating pump;
CO input to hydrophobic membrane cathode through carbon dioxide supply device 2 The CO 2 The water layer dissolved on the surface of the hydrophobic membrane cathode generates H 2 CO 3 Providing an inorganic carbon source necessary for the growth of microalgae and the treatment of sewage containing high ammonia nitrogen;
under the action of voltage, the cathode electrochemical reaction of the hydrophobic membrane generates a large amount of OH − The pH near the cathode of the hydrophobic membrane is raised to capture excess H + Drive H 2 O and H 2 CO 3 Ionization balance and leftward shift of (a), and stable formation of HCO 3 − Slow down high CO 2 Inhibiting effect and improving carbon fixation efficiency of microalgae;
high CO 2 Inhibiting high CO in carbon sequestration of microalgae 2 The content of (2) is 100%.
7. The hydrophobic membrane-based cathode mitigation of high CO of claim 6 2 A method for inhibiting carbon fixation of microalgae is characterized in that under the action of voltage, the current density between the anode and the cathode of a hydrophobic membrane is maintained at 10-50A m −2 Between them.
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