CN220317530U - Coupling device - Google Patents
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- CN220317530U CN220317530U CN202320901028.7U CN202320901028U CN220317530U CN 220317530 U CN220317530 U CN 220317530U CN 202320901028 U CN202320901028 U CN 202320901028U CN 220317530 U CN220317530 U CN 220317530U
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Abstract
The utility model discloses a coupling device of a microbial electrolytic cell combined with an MCHS electrochemical active flora reactor, and relates to a sewage treatment system. Comprises an MCHS electrochemical active flora reactor, a microbial electrolytic cell and a liquid circulation system; the MCHS electrochemical active flora reactor comprises a first reaction tank body for accommodating mixed liquid of active flora and wastewater, and an aeration system arranged in the first reaction tank body; the microbial electrolytic cell comprises a second reaction tank body for containing a mixed solution of active bacteria and wastewater and a power supply, wherein an anode and a cathode of the power supply extend into the second reaction tank body; the liquid circulation system is arranged between the first reaction tank body and the second reaction tank body and is used for circulating and transporting the mixed liquid between the first reaction tank body and the second reaction tank body. The utility model promotes the electron transfer capability of electrochemical active flora in the MCHS reactor, improves the density of the flora, enhances the dominance of the flora, strengthens the impact resistance of the flora to high-salt and high-concentration wastewater environment, and realizes the improvement of the stability and degradation effect of the pretreatment system.
Description
Technical Field
The utility model relates to a sewage treatment system, in particular to a coupling device of a microbial electrolytic cell combined with an MCHS electrochemical active flora reactor.
Background
In recent years, the problem of environmental pollution is increasingly prominent while the economy is rapidly developed, and the water environment is worsened. Urban sewage contains a large amount of organic matters, inorganic pollutants such as nitrogen, phosphorus and the like, untreated sewage is discharged into the environment to easily pollute the receiving environment, such as black and odorous water body formation, soil and groundwater pollution and ecological unbalance. The biological treatment method is mainly characterized in that organic matters are digested by aerobic bacteria in a blasting aeration process, so that the organic matters and nitrogen and phosphorus in the wastewater are removed, the purpose of purifying the wastewater is achieved, and the biological treatment method is an effective method for treating the wastewater.
Among them, the fine chemical wastewater treatment difficulty in the pharmaceutical and chemical industries is especially great, the wastewater contains high concentration organic matters, the biodegradability is poor, and the wastewater has higher microbial toxicity. At present, the high-concentration wastewater is pretreated mainly by an advanced oxidation process and a biological method. The advanced oxidation technology is widely used at present, but a large amount of medicaments and electric charges are consumed in the process, the operation cost is high, and the degradation effect is general; the biological principle is to degrade organic matters in the high-concentration wastewater through assimilation and metabolism of microorganisms, and the method has lower treatment cost and better effect. The nature of the microbial degradation contaminants is the redox of organics and the transfer of electrons. The electrochemical active flora is taken as a special microorganism, the electron transfer network is more developed, and the special extracellular electron transfer capability is realized. Compared with common activated sludge, the mixed flora of the electroactive bacteria can catalyze and degrade more organic species, and the degradation efficiency is higher. However, the wastewater in the chemical industry often has larger fluctuation of water quality and water quantity. Some electroactive bacteria are difficult to adapt to the stress environment caused by water quality fluctuation, and activity of the bacteria is reduced in the treatment process, so that the finally formed electrochemical mixed bacteria have limited treatment effect on wastewater.
Disclosure of Invention
In order to solve the technical problem that the treatment effect of an MCHS electrochemical mixed bacteria pretreatment system is reduced when the incoming water is subjected to fluctuation impact, the utility model provides a coupling device of a Microbial Electrolytic Cell (MEC) combined with an MCHS electrochemical active bacteria pretreatment reactor, so that the growth speed of bacteria is improved, the impact resistance to high-concentration wastewater is realized, and the stability and degradation effect of the pretreatment system are improved.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a coupling device of a microbial electrolytic cell combined with an MCHS electrochemical active flora reactor, which comprises the MCHS electrochemical active flora reactor, the microbial electrolytic cell and a liquid circulation system;
the MCHS electrochemical active flora reactor comprises a first reaction tank body for accommodating mixed liquid of active flora and wastewater, and an aeration system arranged in the first reaction tank body;
the microbial electrolytic cell comprises a second reaction tank body for containing a mixed solution of active bacteria and wastewater and a power supply, wherein an anode and a cathode of the power supply extend into the second reaction tank body;
the liquid circulation system is arranged between the first reaction tank body and the second reaction tank body and is used for circulating and transporting the mixed liquid between the first reaction tank body and the second reaction tank body.
In certain embodiments of the utility model, the anode of the power supply comprises an anode column.
In certain embodiments of the utility model, the anode column is made of stainless steel.
In some embodiments of the present utility model, the cathode of the power supply includes a hollow cathode barrel, and a plurality of through holes are formed in the cathode barrel; the anode of the power supply is arranged in the cathode barrel.
In certain embodiments of the utility model, the cathode barrel is made of graphite.
In some embodiments of the utility model, the top of the second reaction tank is provided with an exhaust port.
In certain embodiments of the utility model, the liquid circulation system comprises a first conduit and a second conduit; one end of the first pipeline is connected to the bottom of the second reaction tank body and is provided with a first valve, the other end of the first pipeline extends into the first reaction tank body, and a driving pump for driving the mixed liquid to flow from the first reaction tank body to the second reaction tank body is arranged on the first pipeline; one end of the second pipeline is connected to the top of the second reaction tank body and is provided with a second valve, and the other end of the second pipeline extends into the first reaction tank body.
In some embodiments of the utility model, the aeration system comprises an aeration pipeline arranged at the bottom of the first reaction tank body, an aeration opening arranged on the aeration pipeline, and an aerator for conveying air or oxygen to the aeration pipeline.
In some embodiments of the utility model, the power supply provides a DC voltage of 0.2 to 5.0V.
Compared with the prior art, the utility model has the beneficial effects that:
the MEC unit can electrically stimulate the electrochemical bacterial liquid in the MCHS reactor, enhance the expression quantity of the electrochemical active bacteria on heme proteins, improve the electron transfer capacity, synchronously improve the growth speed of flora, realize the impact resistance to high-concentration wastewater, and improve the stability and degradation effect of a pretreatment system. The MEC unit can be started to be used under three conditions, so that the treatment effect of the MCHS pretreatment system is improved:
1. reactor start-up period: the startup debugging time (efficiency is improved by 3-5 times) of the bioreactor can be greatly shortened by starting the MEC unit;
2. recovery period after impact: the incoming water of the pharmaceutical chemical wastewater generally fluctuates greatly, and when the bioreactor is impacted by high-concentration incoming water, the device can help the electrochemical active strain to quickly recover the activity and the electron transfer capability.
3. Long-term sustained use: in the conventional operation process, the operation under low voltage can improve the treatment efficiency of the MCHS reactor for 20-30% of pollutants.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present utility model.
FIG. 2 is a schematic diagram of the operation of the microbial cell of the present utility model.
In the figure:
1. an MCHS electrochemically active bacterial population reactor; 11. a first reaction tank; 12. an aeration system; 121. an aeration pipe; 122. an aeration port; 123. an aerator;
2. a liquid circulation system; 21. a first pipe; 22. a second pipe; 23. driving a pump; 24. a first valve; 25. a second valve;
3. a microbial electrolytic cell; 31. a second reaction tank; 32. a power supply; 33. a cathode; 34. and an anode.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the present embodiment provides a coupling device for combining a microbial electrolytic cell with an MCHS electrochemical active flora reactor, which includes an MCHS electrochemical active flora reactor 1, a liquid circulation system 2, and a microbial electrolytic cell 3;
the MCHS electrochemical active flora reactor 1 comprises a first reaction tank 11 for containing a mixed solution of active flora and wastewater, and an aeration system 12 arranged inside the first reaction tank 11. Air or oxygen is delivered to the first reaction tank through the aeration system 12, so that the active flora (aerobic microorganisms) in the mixed solution degrade complex organic matters in the high-concentration wastewater. In the present reactor, the impact resistance limited by the active flora may lead to unstable system operation during high concentration wastewater treatment.
In order to achieve the aeration effect, the aeration system 12 includes an aeration pipe 121 disposed at the bottom of the first reaction tank 11, an aeration port 122 formed on the aeration pipe 121, and an aerator 123 for delivering air or oxygen to the aeration pipe 121. The aeration pipe 121 may be a coil pipe laid flat on the bottom of the first reaction tank 11, and the aeration openings 122 are uniformly arranged on the coil pipe.
The microbial electrolytic cell 3 comprises a second reaction tank 31 for containing a mixed solution of active bacteria and wastewater, and a power supply 32, wherein an anode 34 and a cathode 33 of the power supply 32 extend into the second reaction tank 31. Under the action of the applied voltage, the active bacteria near the anode 34 undergo oxidation reaction, electrons transferred from the anode are obtained by the cathode, and then the surrounding organic matters are reduced, so that the organic matters are degraded.
The microbial electrolytic cell 3 changes the micro-ecological environment of the active flora in a bioelectric stimulation mode, and enhances the growth and enrichment of the active flora. The specific principle is as follows:
microorganisms (i.e., active flora) undergo various chemical reactions when degrading a substance, and some researchers have found that some microorganisms produce electricity when they undergo certain chemical reactions. Hereinafter, various kinds of microorganisms having electrogenic properties, such as microorganisms of the genus Shewanella (Shewanella sp.), the genus Agrobacterium (Geobabacter sp.), the genus Vibrio (Geovibrio sp.), the genus Escherichia (Escherichia sp.), the genus Pseudomonas (Pseudomonas sp.), and the like, have been found by research.
As shown in FIG. 2, the microbial cell is a system in which microorganisms are used as catalysts to catalyze oxidation-reduction reactions on the surfaces of electrodes. The microorganism electrolytic cell combines microorganisms with electrochemistry, and the purpose of degrading pollutants is achieved by utilizing the electrochemical characteristics of certain microorganisms. The microbial electrolytic cell comprises a cathode and an anode, a cathode area and an anode area are arranged corresponding to the microbial electrolytic cell, the anode area electrode is used as an electron acceptor, and a substrate performs oxidation reaction to transfer electrons to the anode; the electrode in the cathode region serves as an electron donor, where the substrate undergoes a reduction reaction and the cathode provides electrons.
Under the action of the applied voltage, the electrochemically active microorganisms adhere to the electrode to form a biomembrane electrode, and can perform microbial oxidation reaction (anode) and microbial reduction reaction (cathode). At the anode, microorganisms produce electrons by oxidizing carbohydrates (acetate, etc.) and transfer them to the anode; at the cathode, electrons transferred from the anode are consumed by target pollutants, and the target pollutants are finally degraded as electron acceptors, so that the purpose of purifying water is achieved.
Under the condition of small applied voltage, the microbial electrolytic cell can effectively change the permeability of microbial cell membranes, the growth and metabolic activity of microorganisms, the community structure of the microorganisms, the micro-ecological environment where the microorganisms are positioned and the like, thereby improving the removal rate of the organic matters difficult to biodegrade.
In microbial cell systems, electrical stimulation is capable of enriching and acclimating certain functional microorganisms that meet the needs of the application. Under short-term electrical stimulation, low-intensity direct current has no obvious effect on the microbial community structure, while high-intensity direct current can reduce the diversity of the microbial community structure. The long-term electrical stimulation can enrich functional microorganisms and play a decisive role in the evolution of microbial communities. Some functional microorganisms can directly or indirectly act with the electrode to maintain higher biological metabolism activity, diversity and growth rate, so that the electrical stimulation can relieve the inhibition of the adverse environmental conditions on the biological metabolism activity of the microorganisms and improve the temperature resistance, cold resistance and salt resistance of the microorganisms for the environmental conditions which are unfavorable for the growth of the microorganisms, such as low temperature, high salinity and the like. In addition, when toxic and harmful refractory organic matters or high-load organic matters are treated, the functional microorganisms can have stronger biodegradability under the electrical stimulation, and the microorganisms can maintain higher biodiversity and growth metabolic activity, so that the removal effect of the toxic and harmful refractory organic matters is improved. And the microorganism can maintain higher biodiversity and growth metabolism activity, and the removal effect on toxic and harmful refractory organic matters is improved. However, electrical stimulation may also inhibit the growth metabolism of certain microorganisms, rendering them competitive to non-functional microorganisms, resulting in a gradual decrease in their diversity. Environmental conditions such as pH, redox potential, metal ions (fe2+) and the like play a critical role in the growth metabolism of microorganisms. The selection of the appropriate electrical stimulation can create a micro-ecological environment suitable for the growth of microorganisms by changing the above environmental conditions, and enhance the growth and enrichment of functional microorganisms. The power supply 32 of the present embodiment preferably provides a dc voltage of 0.2 to 5.0V.
Specifically, the second reaction tank 31 is made of cylindrical acrylic organic glass with an inner diameter of 18cm and a height of 40cm, and an exhaust port is provided at the top for exhausting gas generated by the reaction, and the effective volume of the second reaction tank 31 is 10.2L more. The anode 34 of the power supply 32 comprises an anode column made of stainless steel; the cathode 33 of the power supply 32 comprises a hollow cathode barrel made of graphite, a plurality of through holes are formed in the cathode barrel, the anode 34 of the power supply is arranged in the cathode barrel, and the mixed solution enters the inside of the cathode barrel through the through holes to be fully contacted with the anode 34. The anode and the cathode of the embodiment are designed into a column and barrel structure, so that the contact area between two stages can be greatly increased, electron transfer is promoted, the electric field effect is increased, and the water treatment efficiency of the device is improved.
The liquid circulation system 2 is disposed between the first reaction tank 11 and the second reaction tank 31, and is used for circulating and transporting the mixed liquid between the first reaction tank 1 and the second reaction tank 3. When in use, the mixed solution of the first reaction tank 11 is subjected to aeration degradation, then the mixed solution (comprising active bacteria and high-concentration wastewater) enters from the bottom of the second reaction tank 31, and then the microbial oxidation reaction (anode) and the microbial reduction reaction (cathode) are carried out in the second reaction tank 31, so that the purpose of purifying water is achieved, and then the mixed solution flows back into the first reaction tank 11 from the top of the second reaction tank 31.
Specifically, the liquid circulation system 2 includes a first pipe 21 and a second pipe 22.
One end of the first pipe 21 is connected to the bottom of the second reaction tank 31 and provided with a first valve 24, the other end extends into the first reaction tank 11, and the first pipe 21 is provided with a driving pump 23 for driving the mixed liquid to flow from the first reaction tank 11 to the second reaction tank 31. One end of the second pipe 22 is connected to the top of the second reaction tank 31 and is provided with a second valve 25, and the other end extends into the first reaction tank 11. Thereby realizing smooth circulation of the mixed solution between the first reaction tank 11 and the second reaction tank 31.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. The coupling device for combining the microbial electrolytic cell with the MCHS electrochemical active flora reactor is characterized by comprising the MCHS electrochemical active flora reactor, the microbial electrolytic cell and a liquid circulation system;
the MCHS electrochemical active flora reactor comprises a first reaction tank body for accommodating mixed liquid of active flora and wastewater, and an aeration system arranged in the first reaction tank body;
the microbial electrolytic cell comprises a second reaction tank body for containing a mixed solution of active bacteria and wastewater and a power supply, wherein an anode and a cathode of the power supply extend into the second reaction tank body;
the liquid circulation system is arranged between the first reaction tank body and the second reaction tank body and is used for circulating and transporting the mixed liquid between the first reaction tank body and the second reaction tank body.
2. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial population reactor according to claim 1 wherein the anode of the power source comprises an anode column.
3. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial colony reactor according to claim 2 wherein the anode column is made of stainless steel.
4. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial colony reactor according to claim 1, 2 or 3 wherein the cathode of the power source comprises a hollow cathode barrel with a plurality of through holes; the anode of the power supply is arranged in the cathode barrel.
5. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial colony reactor according to claim 4 wherein the cathode barrels are made of graphite.
6. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial population reactor according to claim 1 wherein the top of the second reaction tank is provided with an exhaust port.
7. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial population reactor according to claim 1 wherein the fluid circulation system includes a first conduit and a second conduit; one end of the first pipeline is connected to the bottom of the second reaction tank body and is provided with a first valve, the other end of the first pipeline extends into the first reaction tank body, and a driving pump for driving the mixed liquid to flow from the first reaction tank body to the second reaction tank body is arranged on the first pipeline; one end of the second pipeline is connected to the top of the second reaction tank body and is provided with a second valve, and the other end of the second pipeline extends into the first reaction tank body.
8. The coupling device for a microbial electrolysis cell combined with an MCHS electrochemical active microbial community reactor according to claim 1, wherein the aeration system comprises an aeration pipe arranged at the bottom of the first reaction tank, an aeration port arranged on the aeration pipe, and an aerator for conveying air or oxygen to the aeration pipe.
9. A coupling device for a microbial electrolysis cell in combination with an MCHS electrochemically active bacterial colony reactor according to claim 1 wherein the power source provides a dc voltage of 0.2 to 5.0V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320901028.7U CN220317530U (en) | 2023-04-20 | 2023-04-20 | Coupling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320901028.7U CN220317530U (en) | 2023-04-20 | 2023-04-20 | Coupling device |
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| CN220317530U true CN220317530U (en) | 2024-01-09 |
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| CN202320901028.7U Active CN220317530U (en) | 2023-04-20 | 2023-04-20 | Coupling device |
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| CN (1) | CN220317530U (en) |
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