CN210656331U - Sewage treatment device of coupling microbial fuel cell and electro-Fenton system - Google Patents
Sewage treatment device of coupling microbial fuel cell and electro-Fenton system Download PDFInfo
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- CN210656331U CN210656331U CN201921417979.7U CN201921417979U CN210656331U CN 210656331 U CN210656331 U CN 210656331U CN 201921417979 U CN201921417979 U CN 201921417979U CN 210656331 U CN210656331 U CN 210656331U
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Abstract
The utility model belongs to sewage treatment and resourceful field, concretely relates to sewage treatment plant of coupling microbial fuel cell and electro-Fenton system. The utility model discloses with traditional MFCs fuel cell and electro-Fenton sewage treatment system coupling, with MFC's system cathode setting in electro-Fenton reaction zone, be equivalent to with MFCs cathode chamber and electro-Fenton reaction chamber integration at a cavity, utilize the MFCs cathode to Fe3+Promotion of Fe in the electro-Fenton System2+The regeneration of the MFCs improves the removal and mineralization capacity of the electro-Fenton system to refractory organic matters, and the electron acceptor generated by the electro-Fenton reaction can improve the cathode potential of the MFCs, so that the oxidation of the anode electrogenesis bacteria of the MFCs to the substrate is promoted, and the output voltage of the MFCs is improved.
Description
Technical Field
The utility model belongs to sewage treatment and resourceful field, concretely relates to sewage treatment plant of coupling microbial fuel cell and electro-Fenton system.
Background
The dye wastewater is difficult to effectively treat by adopting a conventional method due to deep chromaticity, complex components and difficult biochemical degradation. Most dyes are biological toxic pollutants, and are one of the problems which are continuously solved in the field of water pollution control and treatment. electro-Fenton process for the production of H by the reduction of oxygen at the cathode with the addition of electrical energy2O2By Fe2+Activation of H2O2OH is generated to oxidize or mineralize the refractory fuel molecules.
H2O2Yield and Fe in the System2+Concentration is the two most important factors that determine the efficiency of the electro-fenton system. In the electro-Fenton system, anodic oxidation and Fenton reaction are used to make Fe2+Fast oxidation to Fe3+While the cathode can reduce Fe3+Promotion of Fe2+And (4) regenerating. Some studies have shown that some gas diffusion electrodes have a higher H2O2Yield, however, of Fe at high reduction potential3+Almost has no reducing capability, so that Fe in the system2+The concentration is far from sufficient to support an efficient fenton reaction. H of three-dimensional carbon felt electrode2O2Yield less than some gas diffusion electrodes, but for Fe3+The reduction rate of (2) is high. Under Fe3+The reduction rate is limited, and the electro-Fenton system with the gas diffusion electrode as the cathode is less efficient than the three-dimensional carbon felt electrode.
The use of three-dimensional carbon felt electrodes requires aeration into the system. The gas diffusion electrode can be made into a waterproof and breathable air cathode, and an electro-Fenton system adopting the air cathode can avoid aeration. Compared with the prior art, the system without aeration has the advantages of investment, operation cost and the like.
Microbial Fuel Cells (MFCs) are an environmental engineering technology that integrates sewage treatment and energy recovery. The MFCs do not need external energy input, and can mineralize organic matters in sewage and generate biological electrons to recover chemical energy in the biological electrons. The MFCs can remove organic pollutants through various ways, but the treatment efficiency of the MFCs on the refractory pollutants is low because the refractory organics are difficult to be utilized by the anode electrogenic bacteria. The MFCs cathode can accept various electronsA receptor. Oxygen is the most commonly used cathode electron acceptor due to its advantages such as higher oxidation-reduction potential, clean product, etc. Fe3+/Fe2+Standard redox potential (E)00.77V vs. nhe) higher than MFCs anode, Fe3+And also as cathode electron acceptors for MFCs.
SUMMERY OF THE UTILITY MODEL
To prior art's above defect or improvement demand, the utility model provides a coupling microbial fuel cell's air cathode electro-Fenton sewage treatment system, it is through the coupling with microbial fuel cell and air cathode electro-Fenton system, with MFCs cathode chamber and the integration of electro-Fenton reaction chamber at a cavity, has constructed MFCs and electro-Fenton coupled system, improves the efficiency of getting rid of to organic matter separately, solve current electro-Fenton sewage treatment system or the not good technical problem of efficiency is got rid of to MFCs system organic matter from this.
To achieve the above objects, according to one aspect of the present invention, there is provided a sewage treatment apparatus coupling a microbial fuel cell and an electro-fenton reaction system, the sewage treatment apparatus including a MFCs reaction zone and an electro-fenton reaction zone, wherein the MFCs reaction zone and the electro-fenton reaction zone are separated by a proton exchange membrane;
the electro-Fenton reaction area is provided with an electro-Fenton system cathode and an electro-Fenton system anode; the cathode of the electro-Fenton system and the anode of the electro-Fenton system form a current loop;
an MFCs system anode is also arranged in the electro-Fenton reaction zone;
the MFCs reaction zone is provided with an MFCs system cathode; the MFCs system anode and the MFCs system cathode form a current loop;
the MFCs reaction zone and the electro-Fenton reaction zone both contain organic wastewater.
Preferably, the electro-Fenton reaction zone is further provided with a reference electrode, and the cathode of the electro-Fenton system, the anode of the electro-Fenton system and the reference electrode are connected through an electrochemical workstation.
Preferably, the cathode of the electro-fenton system is a gas diffusion electrode.
Preferably, the cathode of the electro-fenton system is an air cathode.
Preferably, the electro-fenton system anode is a dimensionally stable anode.
Preferably, the anode of the MFCs system is carbon cloth, and the cathode of the MFCs system is carbon felt.
Preferably, the MFCs system cathode is disposed on a side of the MFCs reaction zone close to the MFCs reaction zone, and the mfcton system cathode and the mfcton system anode are disposed on a side of the MFCs reaction zone away from the MFCs reaction zone.
Preferably, when the device is used, the MFCs reaction zone and the electro-fenton reaction zone are used for containing organic wastewater, and ferric ions or ferrous ions are further added into the organic wastewater in the electro-fenton reaction zone.
Preferably, the MFCs system anode and MFCs system cathode are connected by a wire; and the lead is connected with a load.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the utility model discloses with traditional MFCs fuel cell and electro-Fenton sewage treatment system coupling, with MFCs's system cathode setting in electro-Fenton reaction zone, be equivalent to with MFCs cathode chamber and electro-Fenton reaction chamber integration at a cavity, utilize the MFCs cathode to Fe3+Promotion of Fe in the electro-Fenton System2+The regeneration of the MFCs improves the removal and mineralization capacity of the electro-Fenton system to refractory organic matters, and the electron acceptor generated by the electro-Fenton reaction can improve the cathode potential of the MFCs, so that the oxidation of the anode electrogenesis bacteria of the MFCs to the substrate is promoted, and the output voltage of the MFCs is improved.
(2) The utility model discloses an air cathode's electro-Fenton system does not need the aeration, and can improve the MFCs' of coupling with it electrogenesis performance, and the MFCs negative pole can improve the efficiency of electro-Fenton system again. What is constructed by the utility model is a coupling system which is mutually cooperated and promoted.
(3) The utility model discloses the air cathode electro-fenton reaction does not need the aeration, the utility model discloses aeration equipment's investment and operation cost can be saved.
(4) Microbial fuel cell cathodes promote Fe3+The utility model discloses can improve the ability of going to the difficult degradation organic pollutant of electro-Fenton system.
(5) The electro-Fenton reaction improves the cathode potential of the microbial fuel cell, can improve the voltage output of the cell, and improves the energy recovery in wastewater treatment. Meanwhile, the oxidation rate of the microbial fuel cell to organic matters is accelerated.
Drawings
FIG. 1 is a schematic structural diagram of an air cathode electro-Fenton sewage treatment system coupled with a microbial fuel cell according to the present invention;
FIG. 2 is a graph comparing the effect of a separate electro-Fenton system, a separate adsorption and the microbial fuel cell and electro-Fenton coupling system of example 1 of the present invention on rhodamine B removal;
fig. 3 is a graph comparing the effect of the individual electro-fenton system and the microbial fuel cell and electro-fenton coupling system of embodiment 2 of the present invention on the removal of rhodamine B;
fig. 4 is a graph comparing the effect of the individual electro-fenton system and the microbial fuel cell and electro-fenton coupling system of embodiment 2 of the present invention on the removal of rhodamine B;
FIG. 5 is the effect of the coupled system of example 3 on the electricity generation performance of a microbial fuel cell.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-MFCs reaction zone; 2-an electro-Fenton reaction zone; 3-a proton exchange membrane; 11-MFCs system anode; 12-MFCs system cathode; 13-a wire; 14-load; 21-an electro-fenton system cathode; 22-an electro-fenton system anode; 23-reference electrode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The utility model provides a pair of coupling microbial fuel cell and electro-Fenton sewage treatment system's sewage treatment plant, this sewage treatment plant includes MFCs reaction zone 1 and electro-Fenton reaction zone 2, wherein, MFCs reaction zone 1 and electro-Fenton reaction zone 2 separate through proton exchange membrane 3;
the electro-Fenton reaction zone 2 is provided with an electro-Fenton system cathode 21 and an electro-Fenton system anode 22; the cathode 21 of the electro-Fenton system and the anode 22 of the electro-Fenton system form a current loop;
an MFCs system anode 11 is also arranged in the electro-Fenton reaction zone 2;
the MFCs reaction zone 1 is provided with an MFCs system cathode 12, and the MFCs system anode 11 and the MFCs system cathode 12 constitute a current loop.
When the device is used, the MFCs reaction zone 1 and the electro-Fenton reaction zone 2 are used for containing organic wastewater, and ferric ions or ferrous ions are also added into the organic wastewater in the electro-Fenton reaction zone 2.
In some embodiments, the MFCs system anode 11 and MFCs system cathode 12 are connected by a wire 13, and a load 14 is connected to the wire 13, where the load 14 may be a resistor or an external circuit.
electro-Fenton reaction system be the electro-Fenton system who uses the gas diffusion electrode as the negative pole among the prior art, including submergence formula gas diffusion electrode and air cathode, its principle is that negative pole reduction oxygen produces hydrogen peroxide, generates the hydroxyl free radical through ferrous activation.
The utility model discloses with the coupling of electro-Fenton reaction system and microbial fuel cell, the Fe that generates after the Fenton reaction3+Reduction by the cathode of the microbial fuel cell coupled to the electro-Fenton reactor, thereby continuing the electro-Fenton process. The utility model discloses contain the microbial fuel cell reaction and the electro-Fenton reaction that independently carry out and promote each other.
MFCs system negative pole and MFCs system positive pole material and electro-Fenton system negative pole and positive pole, reference electrode's selection etc. all can refer to prior art, MFCs fuel cell reaction system and electro-Fenton reaction system all can refer to prior art with the constitution, the utility model discloses with traditional MFCs fuel cell and the coupling of electro-Fenton system, set up MFCs fuel cell system negative pole in the electro-Fenton reaction zone ingeniously, can promote the two respective organic matter degradation efficiency of the two simultaneously.
In some embodiments, the electro-fenton reaction zone 2 is further provided with a reference electrode 23, and the cathode 21 of the electro-fenton system, the anode 22 of the electro-fenton system and the reference electrode 23 are connected through an electrochemical workstation.
In some embodiments, the cathode 21 of the electro-fenton system is a gas diffusion electrode.
In some embodiments, the cathode 21 of the electro-fenton system is an air cathode. The advantage of using an air cathode is that no aeration is required. In some embodiments, the air cathode is an activated carbon graphite powder mixed electrode.
In some embodiments, the electro-Fenton system anode 22 is a dimensionally stable anode, such as a platinum sheet metal or BDD (boron doped diamond film) electrode.
In some embodiments, the MFCs system anode 11 is a carbon cloth and the MFCs system cathode 12 is a carbon felt.
In some embodiments, the MFCs system cathode 12 is disposed on a side of the mfc reaction zone close to the MFCs reaction zone 1, and the mfcton system cathode 21 and the mfcton system anode 22 are disposed on a side of the mfcton reaction zone away from the MFCs reaction zone 1.
In some embodiments, the cavity of the sewage treatment device is made of organic glass, and the cavity is of a cylindrical structure.
In some embodiments, the MFCs reaction zone inoculum is activated sludge from a sewage plant. The inoculum contains anaerobic electrogenesis bacteria, organic matters in anolyte of the MFCs reaction zone are oxidized and decomposed by the anaerobic electrogenesis bacteria after inoculation to generate electrons, the electrons are transmitted to the MFCs cathode through an external circuit, and an electron acceptor of the cathode chamber is reduced to realize pollutant removal and energy recovery.
In some embodiments, the electrolyte of the catholyte in the electro-Fenton reaction zone is 50mM Na2SO4，0.5mM FeSO4The pH was adjusted to 2.8 with sulfuric acid.
In some embodiments, the electro-fenton system comprises an air cathode and a counter electrode, wherein the counter electrode is selected from but not limited to a platinum sheet.
In some embodiments, Fe may be promoted by coupling a carbon felt as a cathode for MFCs to an air cathode electro-fenton system3+The efficiency of the electro-fenton system is improved. At the same time, due to Fe3+The reduction of the radicals and the micro oxygen bubbles generated by the electro-Fenton anode oxidation water on the cathode of the MFCs can improve the output voltage of the MFCs and promote the anode microbial oxidation of the MFCs.
The utility model relates to a coupling microbial fuel cell and electro-Fenton sewage treatment system's sewage treatment plant improves the power generation of the ability of getting rid of difficult degradation organic matter and microbial fuel cell, belongs to sewage treatment and resourceful field. The system comprises: an electro-Fenton reaction zone for treating the degradation-resistant sewage; the microbial fuel cell is used for treating the sewage and reducing ferric iron; the microbial fuel cell is of a double-chamber structure, a cathode chamber of the microbial fuel cell is coupled with an electro-Fenton reaction zone in situ, and the removal of system pollutants is improved by promoting the regeneration of ferrous iron in an electro-Fenton system through the cathode of the microbial fuel cell.
The utility model discloses with microbial fuel cell and the electro-Fenton coupling of air cathode, improved respective efficiency, be an energy-concerving and environment-protective water treatment technology.
The sewage treatment device of the coupling microbial fuel cell and electro-Fenton sewage treatment system has the operation method that: adding general sewage with good biodegradability, such as domestic sewage or food processing industry wastewater, into the anode chamber of the microbial fuel cell. Oxidizing organic matters by using the microbial anode electrogenesis bacteria, and when the organic matters are exhausted, reducing the output voltage of the microbial fuel cell, and replacing new sewage at the moment; to the electro-Fenton reaction zoneAdding refractory organic wastewater, such as dye wastewater; adding proper amount of Fe2+Or Fe3+And continuously applying current to the air cathode to achieve the treatment target.
The following are examples:
example 1:
as shown in fig. 1, the present invention provides a sewage treatment device coupling a microbial fuel cell and an electro-fenton reaction system, which comprises a MFCs reaction zone 1 and an electro-fenton reaction zone 2, wherein the MFCs reaction zone 1 and the electro-fenton reaction zone 2 are separated by a proton exchange membrane 3; the electro-Fenton reaction zone 2 is provided with an electro-Fenton system cathode 21 and an electro-Fenton system anode 22; the cathode 21 of the electro-Fenton system and the anode 22 of the electro-Fenton system form a current loop; an MFCs system anode 11 is also arranged in the electro-Fenton reaction zone 2; the MFCs reaction zone 1 is provided with a MFCs system cathode 12. The MFCs system anode 11 and MFCs system cathode 12 are connected by a wire 13, and a load 14 is connected to the wire 13. The load 14 is here a resistor. The MFCs reaction zone 1 and the electro-Fenton reaction zone 2 both contain organic wastewater.
In this embodiment, the anolyte in the anode chamber, i.e., the MFCs reaction zone simulates wastewater containing general organic matters, such as domestic sewage or wastewater in the food processing industry, and the catholyte in the cathode chamber, i.e., the electro-fenton reaction zone in fig. 1 simulates rhodamine solution in wastewater containing refractory organic matters.
In the reaction system shown in fig. 1, the volume and the effective volume of the MFCs reaction zone 1 and the electro-fenton reaction zone 2 are both 28mL, the MFCs system anode 11 is made of carbon cloth, the MFCs system anode 11 and the electro-fenton system cathode 21 are both 3.8cm in diameter, and the MFCs system anode 11 is 3cm in diameter; the MFCs reaction zone 1 enriches the electrogenic microorganisms by inoculating sludge, an MFCs system anode 11 uses 50mM phosphate buffer (pH 7.2) as a supporting electrolyte, and adds certain amounts of trace elements and microorganism solution, and the substrate of the MFCs system anode 11 is 1g/L sodium acetate; the electro-Fenton reaction zone 2 uses 50mM sodium sulfate solution as supporting electrolyte, uses sulfuric acid to adjust the pH value to 2.8, and adds 0.5mM ferrous sulfate catalyst and rhodamine B (initial concentration is 50 mg/L). Magnetons are arranged in the electro-Fenton reaction zone 2, and the catholyte is continuously stirred by a magnetic stirrer.
An electrochemical workstation is used for providing a stable potential for an air cathode, namely a cathode 21 of an electro-Fenton system, and oxygen in the air generates a reduction reaction O at the air cathode2+2H++2e-→H2O2And the system does not need mechanical aeration.
The electro-Fenton reaction generates free radicals and oxygen, 3H, on the surface of the anode2O→·OHads+O2↑+5H++5e-
Fe produced after Fenton reaction3+A reduction reaction occurs on the MFCs system cathode 12: fe3++e-→Fe2+The reaction promotes Fe2+The fenton reaction is continued.
FIG. 2 shows the degradation of rhodamine B in the cathode chamber, i.e. electro-Fenton reaction zone 2, when-0.8V potential is applied to the air cathode, the degradation of rhodamine B is slower by the uncoupled electro-Fenton (MFCs with open circuit on the external circuit, corresponding to the electro-Fenton curve in the figure), and the reaction rate constant is 0.203min-1The removal rate in 6 minutes was 57.3%; after the microbial fuel cell is coupled with the electro-Fenton air cathode, the degradation of rhodamine B is accelerated, and the reaction rate constant is 0.304min-1The 6-minute removal rate was 74.7%. The adsorption curve in fig. 2 shows that the rhodamine B solution is adsorbed only by using the cathode of the microbial fuel cell, and it can be seen that the adsorption efficiency is very low. The above data indicate that the air cathode electro-Fenton sewage treatment system with coupled microbial fuel cells has higher efficiency in treating refractory organics than the uncoupled air cathode electro-Fenton sewage treatment system.
Example 2:
as shown in fig. 1, the present invention provides a sewage treatment device coupling a microbial fuel cell and an electro-fenton reaction system, which comprises a MFCs reaction zone 1 and an electro-fenton reaction zone 2, wherein the MFCs reaction zone 1 and the electro-fenton reaction zone 2 are separated by a proton exchange membrane 3; the electro-Fenton reaction zone 2 is provided with an electro-Fenton system cathode 21 and an electro-Fenton system anode 22; the cathode 21 of the electro-Fenton system and the anode 22 of the electro-Fenton system form a current loop; an MFCs system anode 11 is also arranged in the electro-Fenton reaction zone 2; the MFCs system anode 11 and the MFCs system cathode 12 are connected through a lead 13, and a load 14 is connected to the lead 13, wherein the load 14 is a resistor; the MFCs reaction zone 1 and the electro-Fenton reaction zone 2 respectively contain organic wastewater with good biodegradability and organic wastewater difficult to degrade.
In this embodiment, the anolyte in the anode chamber, i.e., the MFCs reaction zone simulates waste water containing general organic matters, such as domestic sewage or waste water in the food processing industry. The catholyte in the cathode chamber, namely the electro-Fenton reaction zone in figure 1 simulates the rhodamine solution in the wastewater containing refractory organics.
In the reaction system shown in fig. 1, the volume and the effective volume of the MFCs reaction zone 1 and the electro-fenton reaction zone 2 are both 28mL, the MFCs system anode 11 is made of carbon cloth, the MFCs system anode 11 and the electro-fenton system cathode 21 are both 3.8cm in diameter, and the MFCs system anode 11 is 3cm in diameter; the MFCs reaction zone 1 enriches the electrogenic microorganisms by inoculating sludge, an MFCs system anode 11 uses 50mM phosphate buffer (pH 7.2) as a supporting electrolyte, and adds certain amounts of trace elements and microorganism solution, and the substrate of the MFCs system anode 11 is 1g/L sodium acetate; the electro-Fenton reaction zone 2 uses 50mM sodium sulfate solution as supporting electrolyte, uses sulfuric acid to adjust the pH value to 2.8, and adds 0.5mM ferrous sulfate catalyst and rhodamine B (initial concentration is 50 mg/L). Magnetons are arranged in the electro-Fenton reaction zone 2, and the catholyte is continuously stirred by a magnetic stirrer.
The electrochemical workstation is used to provide a stable potential to the air cathode, i.e. the cathode 21 of the electro-Fenton system, and the system does not need mechanical aeration.
FIG. 3 shows the degradation of rhodamine B in the cathode chamber, i.e. electro-Fenton reaction zone, when-0.6V potential is applied to the air cathode, the degradation of rhodamine B is slower by the uncoupled electro-Fenton (MFCs with open circuit on the external circuit, corresponding to the electro-Fenton curve in the figure), and the reaction rate constant is 0.119min-1The 10-minute removal rate was 74.8%; after the microbial fuel cell is coupled with the electro-Fenton air cathode, the degradation of rhodamine B is accelerated, and the reaction rate constant is 0.186min-1The 10-minute removal rate was 88.1%. The above data indicate that coupling microorganismsThe air cathode electro-Fenton of the fuel cell has higher treatment efficiency of refractory organic matters than the uncoupled air cathode electro-Fenton sewage treatment system.
Example 3:
as shown in fig. 1, the present invention provides a sewage treatment device coupling a microbial fuel cell and an electro-fenton reaction system, which comprises a MFCs reaction zone 1 and an electro-fenton reaction zone 2, wherein the MFCs reaction zone 1 and the electro-fenton reaction zone 2 are separated by a proton exchange membrane 3; the electro-Fenton reaction zone 2 is provided with an electro-Fenton system cathode 21 and an electro-Fenton system anode 22; the cathode 21 of the electro-Fenton system and the anode 22 of the electro-Fenton system form a current loop; an MFCs system anode 11 is also arranged in the electro-Fenton reaction zone 2; the MFCs system anode 11 and MFCs system cathode 12 are connected by a wire 13, and a load 14 is connected to the wire 13, where the load 14 is a resistor. The MFCs reaction zone 1 and the electro-Fenton reaction zone 2 respectively contain organic wastewater with good biodegradability and organic wastewater difficult to degrade.
In this embodiment, the anolyte in the anode chamber, i.e., the MFCs reaction zone simulates waste water containing general organic matters, such as domestic sewage or waste water in the food processing industry. The catholyte in the cathode chamber, namely the electro-Fenton reaction zone in figure 1 simulates the rhodamine solution in the wastewater containing refractory organics.
In the reaction system shown in fig. 1, the volume and the effective volume of the MFCs reaction zone 1 and the electro-fenton reaction zone 2 are both 28mL, the MFCs system anode 11 is made of carbon cloth, the MFCs system anode 11 and the electro-fenton system cathode 21 are both 3.8cm in diameter, and the MFCs system anode 11 is 3cm in diameter; the MFCs reaction zone 1 enriches the electrogenic microorganisms by inoculating sludge, an MFCs system anode 11 uses 50mM phosphate buffer (pH 7.2) as a supporting electrolyte, and adds certain amounts of trace elements and microorganism solution, and the substrate of the MFCs system anode 11 is 1g/L sodium acetate; the electro-Fenton reaction zone 2 uses 50mM sodium sulfate solution as supporting electrolyte, uses sulfuric acid to adjust the pH value to 2.8, and adds 0.5mM ferrous sulfate catalyst and rhodamine B (initial concentration is 50 mg/L). Magnetons are arranged in the electro-Fenton reaction zone 2, and the catholyte is continuously stirred by a magnetic stirrer.
The electrochemical workstation is used to provide a stable potential to the air cathode, i.e. the cathode 21 of the electro-Fenton system, and the system does not need mechanical aeration.
FIG. 4 shows the degradation of rhodamine B in the cathode chamber, i.e. electro-Fenton reaction zone, when-0.4V potential is applied to the air cathode, the degradation of rhodamine B is slower by the uncoupled electro-Fenton (MFCs with open circuit on the external circuit, corresponding to the electro-Fenton curve in the figure), and the reaction rate constant is 0.069min-1The removal rate in 10 minutes was 56%; after the microbial fuel cell is coupled with the electro-Fenton air cathode, the degradation of rhodamine B is accelerated, and the reaction rate constant is 0.077min-1The 10-minute removal rate was 60.8%. The above data indicate that the air cathode electro-Fenton sewage treatment system with coupled microbial fuel cells has higher efficiency in treating refractory organics than the uncoupled air cathode electro-Fenton sewage treatment system.
FIG. 5 shows the output power curves of the microbial fuel cells in the coupled system, when potentials of-0.8V, -0.6V and-0.4V are applied to the air cathode, the maximum power densities of the MFCs are 1.65, 1.11 and 0.66W/m respectively2And the maximum power density of MFCs for cathode aeration without coupling electro-Fenton was 0.26W/m2. The data show that the coupled electro-Fenton system improves the power generation performance of the MFCs, and the more violent the electro-Fenton reaction is, the more beneficial the improvement of the power generation performance of the MFCs is.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A wastewater treatment apparatus coupling a microbial fuel cell and an electro-fenton reaction system, comprising a MFCs reaction zone (1) and an electro-fenton reaction zone (2), wherein the MFCs reaction zone (1) and the electro-fenton reaction zone (2) are separated by a proton exchange membrane (3);
the electro-Fenton reaction zone (2) is provided with an electro-Fenton system cathode (21) and an electro-Fenton system anode (22); the cathode (21) of the electro-Fenton system and the anode (22) of the electro-Fenton system form a current loop;
an MFCs system anode (11) is also arranged in the electro-Fenton reaction zone (2);
the MFCs reaction zone (1) is provided with an MFCs system cathode (12); the MFCs system anode (11) and the MFCs system cathode (12) form a current loop.
2. The wastewater treatment plant according to claim 1, wherein the electro-Fenton reaction zone (2) is further provided with a reference electrode (23), and the electro-Fenton system cathode (21), the electro-Fenton system anode (22) and the reference electrode (23) are connected by an electrochemical workstation.
3. The wastewater treatment plant according to claim 1, characterized in that the electro-Fenton system cathode (21) is a gas diffusion electrode.
4. The wastewater treatment plant according to claim 1, characterized in that the electro-Fenton system cathode (21) is an air cathode.
5. The wastewater treatment plant according to claim 1, characterized in that the anode (22) of the electro-Fenton system is a dimensionally stable anode.
6. The wastewater treatment apparatus according to claim 1, wherein the MFCs system anode (11) is a carbon cloth, and the MFCs system cathode (12) is a carbon felt.
7. The wastewater treatment apparatus according to claim 1, wherein the MFCs-system cathode (12) is disposed on a side of the MFCs reaction zone close to the MFCs reaction zone (1), and the mfcton-system cathode (21) and the mfcton-system anode (22) are disposed on a side of the MFCs reaction zone away from the MFCs reaction zone (1).
8. The wastewater treatment apparatus according to claim 1, wherein the MFCs reaction zone (1) and the electro-fenton reaction zone (2) are used for containing organic wastewater, and ferric ions or ferrous ions are further added to the organic wastewater in the electro-fenton reaction zone (2) when the apparatus is in use.
9. The sewage treatment apparatus according to claim 1, wherein the MFCs system anode (11) and the MFCs system cathode (12) are connected by a wire (13); and a load (14) is connected to the lead (13).
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| CN112250164A (en) * | 2020-10-13 | 2021-01-22 | 中建一局集团安装工程有限公司 | Device and method for degrading landfill leachate based on microbial fuel cell-Fenton system |
| CN112777723A (en) * | 2020-12-07 | 2021-05-11 | 大连理工大学 | Method for degrading red tide/water bloom algae by in-situ driving electro-Fenton through sediment type microbial fuel cell based on water body bottom mud |
| CN113697938A (en) * | 2021-08-27 | 2021-11-26 | 北京林业大学 | Microbial fuel cell device and persulfate coupling and electric activation method thereof |
| CN114031158A (en) * | 2021-11-26 | 2022-02-11 | 泰州沃源环保科技有限公司 | Domestic sewage treatment method and preparation method of gas diffusion electrode |
| CN117342688A (en) * | 2023-12-04 | 2024-01-05 | 中国环境科学研究院 | Fenton wastewater treatment system of coupling microbial fuel cell |
| CN117342688B (en) * | 2023-12-04 | 2024-03-29 | 中国环境科学研究院 | Fenton wastewater treatment system of coupling microbial fuel cell |
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