KR20170064321A - Single chamber microbial fuel cell to remove organic and nitrogen compounds - Google Patents

Abstract

The present invention relates to a single coarse microbial fuel cell capable of simultaneously removing organic matter and nitrogen, and more particularly, to a coarse microbial fuel cell capable of simultaneously removing organic substances and nitrogen, Decomposition reaction using an organic substance in the wastewater as an electron donor, and an electroactive microorganism using electrons transferred from the electrode. The present invention relates to a single-celled microbial fuel cell capable of simultaneously removing organic matter and nitrogen by inducing complete nitrogen removal due to a denitrification reaction by the denitrification reaction.
The single-celled microbial fuel cell according to the present invention can be easily manufactured because it is simple in shape, and can simultaneously induce decomposition of organic matter, electricity production, nitrification and denitrification with only the oxidized electrode part. As a result, it is possible to eliminate the aeration and external carbon source cost required for the conventional wastewater treatment, and to produce additional electric energy. In addition, the site area of the wastewater treatment plant can be greatly reduced since a single reaction vessel with a relatively small volume is used.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a single-cell microbial fuel cell,

The present invention relates to a single coarse microbial fuel cell capable of simultaneously removing organic matter and nitrogen, and more particularly, to a coarse microbial fuel cell capable of simultaneously removing organic substances and nitrogen, Decomposition reaction using an organic substance in the wastewater as an electron donor, and an electroactive microorganism using electrons transferred from the electrode. The present invention relates to a single-celled microbial fuel cell capable of simultaneously removing organic matter and nitrogen by inducing complete nitrogen removal due to a denitrification reaction by the denitrification reaction.

Microbial fuel cells (MFCs) generate electricity using the metabolic energy of bacteria, which can be used to power fuel cells because all organic matter, including wastes, can feed on bacteria. MFC, which is attracting attention as an alternative energy technology, is a highly efficient energy conversion device that can simultaneously recover energy from pollutants as well as simultaneously use energy as a fuel while removing pollutants in wastewater as food of microorganisms.

Therefore, if MFC is applied to wastewater treatment, clean energy can be provided and effective treatment of wastewater is possible.

The microbial fuel cell is composed of an anode chamber and a cathode chamber, and each electrode section is divided into a separator. In the oxidizing electrode part under anaerobic condition or oxygen-free condition, organic substances are decomposed by bacteria, and hydrogen ions and electrons are generated. The electrons move from the anode to the reduction electrode along the external conductor, and the hydrogen ions pass through the separation membrane and move to the reduction electrode. The electrons and hydrogen ions migrating to the reduction electrode part are subjected to a final reduction reaction with an electron acceptor such as oxygen and nitrate that is supplied to the reduction electrode part, and the electric energy can be recovered through the above-described series of processes.

The microbial fuel cell technology has been attracting much attention from researchers due to its advantage of being able to obtain electricity directly by performing wastewater treatment. Most of the treatment by the microbial fuel cell is acetate, It has been used to convert complex organisms of butyrate, glucose or wastewater into various carbohydrates.

However, general microbial fuel cells can only remove organic matter from wastewater. In order to fully utilize the microbial fuel cell for wastewater treatment, it is necessary to remove not only organic matter but also nutrients such as nitrogen, various disadvantages of the conventional biological nitrogen removal process, aeration cost for nitrification and external carbon source cost for denitrification Must be able to solve it. Therefore, it is required to develop a new concept of a wastewater treatment system capable of simultaneously removing organic matter and nitrogen.

To solve this problem, Korean Patent Registration No. 10-0974928 (Aug. 10, 2010) discloses a hybrid type wastewater treatment apparatus.

Wherein the anaerobic tank includes an organic substance oxidizing microorganism and an oxidizing electrode, wherein the anaerobic tank includes a denitrifying microorganism which is disposed on the surface of the denitrifying microorganism, The oxidation electrode and the reduction electrode are connected by a wire to which the resistor is attached. The oxidation electrode and the reduction electrode are connected by a wire to which the resistor is attached, which is advantageous in that the organic matter and nitrogen can be removed at the same time. However, in the transporting sludge transferred to the anoxic tank, And the effect of the denitrifying microorganisms adhering to the surface of the reducing electrode is impaired to lower the nitrogen treating efficiency.

In addition, most conventional microbial fuel cells capable of nitrogen removal are inefficient in terms of energy. There is a disadvantage in that a technique of supplying dense nitrate of the reducing electrode portion to a denitrification process by feeding a constant potential to the denitrification electrode portion has a disadvantage in that it is required to continuously supply a low removal rate and additional electrical energy and a microorganism fuel cell for removing nitrogen by connecting additional devices, And aeration energy for nitrification is required.

As a result, the inventors of the present invention have conducted researches to improve the problems of conventional microbial fuel cells. As a result, they have found that the use of a reducing electrode as a large-area air reducing electrode in a microbial fuel cell enables aeration, nitrification, It is possible to remove organic matter and nitrogen in a single tank and produce electricity at the same time without addition, and the present invention has been completed.

Korean Patent Publication No. 10-0974928

Accordingly, it is an object of the present invention to provide a microbial fuel cell capable of simultaneously removing organic matter and nitrogen in a single tank with ultralow energy.

It is another object of the present invention to provide a method for simultaneously removing organic matter and nitrogen in wastewater using the single microorganism fuel cell.

In order to achieve the above object,

The present invention relates to a method for removing nitrogen oxides, which comprises the steps of introducing wastewater into an interior of a body, decomposing organic matters by electroactive microorganisms, nitrifying nitrogen by transmitted oxygen, An oxidizing electrode part for performing a biochemical electrochemical denitrification using some electrons generated by the oxidizing electrode part;

An oxidizing electrode which is provided on both outer sides of the oxidation electrode unit and performs electrochemical decomposition by the microorganisms attached to the electroactive microorganisms and moves the generated hydrogen and electrons to the air reducing electrode through the leads and the separator;

A separation membrane provided outside the oxidation electrode to electrically isolate the oxidation electrode from the air reduction electrode;

An air reducing electrode provided outside the separation membrane to react electrons moved from the oxidation electrode with external air to maintain the flow of electrons and to transmit oxygen to the oxidation electrode unit;

An outer frame provided outside the air reducing electrode; And

A conductor connected to the oxidizing electrode and the air reducing electrode, respectively, and exposed to the upper end of the cell;

The present invention provides a single-celled microbial fuel cell capable of simultaneously removing organic matter and nitrogen in wastewater.

More preferably, the microbial fuel cell may be in the form of using a separation membrane and an oxidation electrode having a wide gap.

More preferably, the microbial fuel cell may be configured to use a large-sized air reducing electrode that occupies the majority of the outer frame except for the screw joint portion.

More preferably, the microbial fuel cell may have a large area on both sides of the cell so that oxygen is spontaneously diffused.

More preferably, the microbial fuel cell has a plurality of unit modules, which are provided as a single unit module at a predetermined interval and are connected to each other in a continuous flow manner.

In addition, the present invention provides a method for simultaneous removal of organic matter and nitrogen in wastewater using the single microorganism fuel cell.

More preferably, the method further comprises removing the organic matter in the wastewater introduced into the oxidation reaction tank of the single-stage microbial fuel cell by an electroactive microorganism attached to the oxidizing electrode, wherein the generated electrons and hydrogen ions are respectively connected to external leads At the same time, the ammonia nitrogen is oxidized in the air by the oxygen permeated to the oxidized electrode part, and it is generated by the heterotrophic denitrification using the residual organic matter as the electron donor and the electroactive microorganism And removing the organic matter and nitrogen by a biochemical electrochemical denitrification using some electrons.

The single-celled microbial fuel cell according to the present invention is simple in shape and can be easily manufactured, and has an advantage that it can simultaneously induce decomposition of organic matter, electricity production, nitrification and denitrification with only the oxidized electrode part.

As a result, it is possible to eliminate the aeration and external carbon source cost required for the conventional wastewater treatment, and to produce additional electric energy. In addition, the site area of the wastewater treatment plant can be greatly reduced since a single reaction vessel with a relatively small volume is used.

FIG. 1 is a perspective view of a single-celled microbial fuel cell according to an embodiment of the present invention. FIG.
2 is an exploded perspective view of a single cell microbial fuel cell according to an embodiment of the present invention.
FIG. 3 is a schematic view of organic matter and nitrogen removal phenomena occurring in the single-celled microbial fuel cell according to one embodiment of the present invention.
4 is a perspective view of a continuous flow system of a single coarse microbial fuel cell in accordance with one embodiment of the present invention.
FIG. 5A is a graph showing a change in nitrogen concentration according to a hydraulic residence time condition when the input organic matter is 1,000 mg-COD / L in a single microorganism fuel cell according to an experimental example of the present invention.
FIG. 5B is a graph showing a change in nitrogen concentration according to a hydraulic residence time condition when the organic compound 500 mg-COD / L is introduced into a single microorganism fuel cell according to an experimental example of the present invention.
FIG. 5c is a graph showing the change in nitrogen concentration according to the hydraulic residence time condition when the inflow organic matter is 300 mg-COD / L in the single-bed microorganism fuel cell according to an experimental example of the present invention.
FIG. 6A is a graph showing the change in organic matter concentration according to the hydraulic residence time condition when the input organic matter is 1,000 mg-COD / L in the single-bed microorganism fuel cell according to an experimental example of the present invention.
FIG. 6B is a graph showing the change in organic matter concentration according to the hydraulic residence time condition when the inflow organic matter is 500 mg-COD / L in the single-bed microorganism fuel cell according to an experimental example of the present invention.
FIG. 6C is a graph showing the change in organic matter concentration according to the hydraulic retention time condition when the inflow organic matter is 300 mg-COD / L in the single-bed microorganism fuel cell according to an experimental example of the present invention.
FIG. 7A is a graph showing changes in the voltage production according to the hydraulic residence time condition when the input organic matter is 1,000 mg-COD / L in the single-bed microorganism fuel cell according to an experimental example of the present invention.
FIG. 7B is a graph showing changes in the voltage production according to the hydraulic retention time condition when the inflow organic matter is 500 mg-COD / L in the single coarse microbial fuel cell according to an experimental example of the present invention.
FIG. 7C is a graph showing changes in the voltage production according to the hydraulic retention time condition when the inflow organic matter is 300 mg-COD / L in the single-bed microorganism fuel cell according to one experimental example of the present invention.
8 is a graph showing changes in organic matter and nitrogen concentration in a microbial fuel cell system connected in a continuous flow manner under actual sewage conditions according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a single microorganism fuel cell according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides a monolithic microbial fuel cell that simultaneously removes organic matter and nitrogen.

FIG. 1 is a perspective view of a single microorganism fuel cell according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a single microorganism fuel cell according to an embodiment of the present invention.

The single-group microbial fuel cell of the present invention comprises a rectangular parallelepiped-shaped oxidation electrode unit 10, an oxidation electrode 60 provided on both side surfaces of the oxidation electrode unit 10, The oxidizing electrode 60 including the separator 50, the air reducing electrode 30 provided on the outer side of each separator 50, and the outer frame 20 provided on the outer side of each air reducing electrode 30, And the lead wire (40) connected to the air reducing electrode (30) are exposed on the upper end of the battery.

The oxidizing electrode unit 10 includes a hollow rectangular parallelepiped body to allow the organic matter contained in the wastewater to be decomposed by microorganisms in the wastewater into which the oxidizing electrode 60 is attached, So that the electric energy generated in the decomposition process of the organic matter can be transmitted to the outside.

The oxidation electrode unit 10 has an inlet 11 formed at one side of the lower portion of the body to receive the wastewater and an outlet 12 formed at one side of the body to discharge the treated water having undergone organic decomposition .

The oxidation electrode 60 is provided in close contact with the outside of the wide two sides of the oxidation electrode unit 10, and organic matter in the wastewater is oxidized by the electroactive microorganisms attached to the oxidation electrode to generate hydrogen ions and electrons, Hydrogen ions and electrons can be moved to the air reducing electrode 30 by the conductive wire 40 and the separating film 50, respectively.

A separation membrane 50 is provided on the opposite side of the side surface of the oxidation electrode 60 that is in contact with the oxidized electrode unit 10 so as to be electrically insulated from the air reduction electrode 30 that follows.

The separation membrane 50 is provided in close contact with the outer side of the oxidation electrode 60 to electrically isolate the oxidation electrode 60 from the air reduction electrode 30. The separator 50 may be generally formed in the form of a nonwoven fabric, and may be formed of a polypropylene (PP) nonwoven fabric, a polyethylene terephthalate (PET) nonwoven fabric, or a combination of the two, Of course, it is possible to select it. Needless to say, the separator 50 may be made of a conventional solid plate instead of being formed in a nonwoven fabric, and may be any material that functions to insulate the oxidizing electrode 60 from the air reducing electrode 30. However, the separation membrane should be made of a material having a pore size of sufficient size (several μm or more) so as not to block the movement of microorganisms.

The air reducing electrode 30 generates water H2O by reacting the hydrogen ions H + and electrons e transferred from the oxidizing electrode 60 with the external air O2. In this process, And it plays a role of generating electricity by continuously holding it, and permeates the external oxygen to the oxidation electrode portion.

In a single-celled microbial fuel cell, the reducing electrode is exposed to the atmosphere, which is referred to as an air cathode. This type of microbial fuel cell has higher electrochemical performance than a microbial fuel cell composed of two reactors because oxygen in the atmosphere can be used as a direct electron acceptor and the final reduction reaction is more likely to occur as the area of the air- The performance of the microbial fuel cell can be further increased.

For this purpose, the air reducing electrode 30 is provided on the outer side of the separator 50, and carbon cloth is preferably used in consideration of reaction efficiency and the like, but the present invention is not limited thereto.

The outer frame 20 is provided on the outer side of the air reducing electrode 30 and presses the inner air reducing electrode 30, the separating film 50, the oxidizing electrode 60 and the oxidizing electrode portion 10, It plays a role.

The outer frame 20 is firmly fixed by fastening it to the inside with a coupling means such as a bolt and a nut, at which time the coupling means should not contact the oxidizing electrode.

At this time, through holes are formed to penetrate the air reducing electrode 30 so that the air reducing electrode 30 can easily contact with the air. Oxygen to be used as a final electron acceptor for biological nitrification and electricity production reaction is supplied to the air reducing electrode 30 fixed to the outer frame 20 of the reaction tank. And the air reducing electrode 30 is formed on both sides of the battery in a large area, so that the biological nitrification reaction due to the spontaneous diffusion of oxygen can be promoted.

The oxidizing electrode and the air reducing electrode are connected to each other by a lead wire 40 and are exposed to the upper end of the apparatus.

The organic substance and nitrogen removal mechanism of the single-stage microbial fuel cell of the present invention are as follows.

FIG. 3 is a schematic view of the organic matter and nitrogen removal phenomenon occurring in the single-celled microbial fuel cell according to the present invention.

As shown in FIG. 3, the organic matter in the wastewater is oxidized by the electroactive microorganisms attached to the oxidizing electrode, and the generated electrons and hydrogen ions migrate to the air reducing electrode along the outer conductor and the separation membrane, respectively. Finally, oxygen outside the air reducing electrode is used as the electron acceptor, and electricity is generated continuously through this process. At the same time, ammonia nitrogen is nitrified by using oxygen permeated to the oxidized electrode part in the air, and the heterotrophic denitrification using the residual organic matter as the electron donor and the biochemical electrochemical denitrification reaction using some electrons generated by the electroactive microorganisms occur . All of the above reactions occur simultaneously within a single oxidation electrode portion.

Therefore, by using the single-celled microbial fuel cell according to the present invention, organic matter and nitrogen in the wastewater can be simultaneously removed.

As shown in FIG. 4, the single-celled microorganism fuel cell according to the present invention can be easily connected to the rear end, so that the microorganism fuel cell can be provided as a single unit module, It can be connected by flow. At this time, the number of modules can be variably controlled according to operating conditions such as organic matter and nitrogen concentration in the incoming wastewater and hydraulic retention time.

In addition, the present invention provides a method for simultaneous removal of organic matter and nitrogen in wastewater using the single microorganism fuel cell.

Specifically, the method of simultaneously removing organic substances and nitrogen in wastewater using a single-celled microbial fuel cell according to the present invention is characterized in that the organic substances in the wastewater introduced into the oxidation reaction tank of the single- And the generated electrons and hydrogen ions migrate to the air reducing electrode along the outer conductor and the separator, respectively. At the same time, ammonia nitrogen is nitrified in the air by oxygen permeated to the oxidizing electrode portion, And removing organic substances and nitrogen by a heterotrophic denitrification using residual organic matter as an electron donor and a bioelectrochemical denitrification using some electrons generated by the electroactive microorganisms.

The single-celled microbial fuel cell according to the present invention can be easily manufactured because it is simple in shape, and can simultaneously induce decomposition of organic matter, electricity production, nitrification and denitrification with only the oxidized electrode part. As a result, it is possible to eliminate the aeration and external carbon source cost required for the conventional wastewater treatment, and to produce additional electric energy. In addition, the site area of the wastewater treatment plant can be greatly reduced since a single reaction vessel with a relatively small volume is used.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples are only the preferred embodiments of the present invention, and the present invention is not limited by the following Examples.

[ Example  One] Single group  Microbial fuel cell manufacturing

As shown in Figs. 1 and 2, a single microorganism fuel cell including an oxidizing electrode, a separating membrane, and an air reducing electrode was fabricated on a 150-mL scale. Here, graphite feldspar, nonwoven fabric and carbon cloth were used as the oxidizing electrode, the separator, and the air reducing electrode, respectively, and the air reducing electrode was installed on both sides of the single coarse microbial fuel cell in a large area so that oxygen was spontaneously diffused. The area of the single electrode was 300 cm 2. Activated sludge was used as a seed source, glucose was used as a carbon source (300-1,000 mg-COD / L), and ammonium sulfate was used as a nitrogen source (50 mg-N / L).

[ Experimental Example  1] Single group  In microbial fuel cells Hydraulic residence time  Changes in Nitrogen Concentration by Conditions

5a to 5c show changes in the nitrogen concentration with respect to the hydraulic retention time for the inflowing organic matter in the single coarse microbial fuel cell of the present invention.

FIG. 5A is a graph showing changes in nitrogen concentration due to hydraulic retention time conditions when the influent organic matter is 1,000 mg-COD / L. FIG. As shown in FIG. 5A, the total nitrogen concentration of the effluent was <10 mg-N / L (removal efficiency> 80%) under the hydraulic retention time of 12 hours and <5 mg-N / L at 6 hours Removal efficiency> 90%) and <12 mg-N / L for 3 hours (removal efficiency> 76%).

FIG. 5B is a graph showing a change in nitrogen concentration due to the hydraulic retention time condition when the influent organic matter is 500 mg-COD / L. As shown in FIG. 5B, the total nitrogen concentration at the hydraulic retention time of 3 hours was <17 mg-N / L (removal efficiency> 66%) and <12 mg-N / Efficiency> 76%), and some nitrate nitrogen accumulation occurred.

FIG. 5C is a graph showing changes in nitrogen concentration due to the hydraulic residence time condition when the influent organic matter is 300 mg-COD / L. FIG. As shown in FIG. 5C, the total nitrogen concentration of the effluent was <15 mg-N / L (removal efficiency> 70%) at the hydraulic retention time of 6 hours and 3 hours, and the accumulation phenomenon of some nitrate nitrogen .

From this, it can be seen that the denitrification of 90% or more can be induced by adjusting the hydraulic retention time to 6 hours when the concentration of the influent organic substance is 1,000 mg-COD / L in the single-stage microbial fuel cell according to the present invention.

[ Experimental Example  2] Single group  In microbial fuel cells Hydraulic residence time  Change of organic matter concentration by condition

6A to 6C show changes in the organic matter concentration with respect to the incoming organic matter in the single-celled microbial fuel cell of the present invention with respect to the hydraulic residence time.

FIG. 6A is a graph showing changes in the organic matter concentration by the hydraulic residence time condition when the influent organic matter is 1,000 mg-COD / L. FIG. As shown in FIG. 6A, the concentration of effluent organic matter was <50 mg-COD / L (removal efficiency> 95%) under the hydraulic retention time of 12 hours and 6 hours, (Removal efficiency> 90%).

FIG. 6B is a graph showing the change of the organic matter concentration by the hydraulic retention time condition when the influent organic matter is 500 mg-COD / L. As shown in FIG. 6B, the concentration of effluent organic matter was <25 mg-COD / L (removal efficiency> 95%) at the hydraulic retention time of 3 hours and 6 hours.

FIG. 6C is a graph showing changes in the organic matter concentration by the hydraulic residence time condition when the influent organic matter is 300 mg-COD / L. FIG. As shown in FIG. 6C, the concentration of effluent organic matter was <10 mg-COD / L (removal efficiency> 96%) under the condition of hydraulic retention time of 6 hours and <25 mg-COD / Efficiency> 92%).

As described above, the single-stage microbial fuel cell of the present invention can simultaneously remove organic matter and nitrogen at a high efficiency of 90% or more by controlling the concentration of the introduced organic substances and the mathematical residence time.

[ Experimental Example  3] Single group  In microbial fuel cells Hydraulic residence time  Changes in Voltage Output by Conditions

7A to 7C show changes in the voltage production with respect to the hydraulic retention time for the inflowing organic matter in the single coarse microbial fuel cell of the present invention.

FIG. 7A is a graph showing the change in the voltage production amount under the hydraulic residence time condition when the influent organic matter is 1,000 mg-COD / L. FIG. As shown in FIG. 7A, a maximum voltage of 120 mV was generated under the hydraulic retention time of 12 hours, a maximum voltage of 150 mV was generated under the condition of 6 hours, and a voltage of 280 mV was generated at the time of 3 hours.

FIG. 7B is a graph showing the change in the voltage production amount under the hydraulic residence time condition when the influent organic matter is 500 mg-COD / L. As shown in FIG. 7B, the maximum voltage of 480 mV was generated under the hydraulic retention time of 3 hours, and the voltage output gradually decreased during the 6 hours of operation. Finally, the voltage of 120 mV was generated.

FIG. 7C is a graph showing the change in the voltage production amount under the hydraulic residence time condition when the input organic matter is 300 mg-COD / L. FIG. As shown in FIG. 7C, a maximum voltage of 70 mV was generated under the hydraulic retention time of 6 hours, and a voltage of 250 mV was generated at the maximum of 3 hours.

As described above, it can be seen that the single-celled microbial fuel cell of the present invention is capable of producing electrical energy at a maximum voltage of 480 mV by controlling the concentration of the input organic matter and the mathematical residence time.

[ Example  2] Continuous flow type  Microbial fuel cell system

As shown in FIG. 4, the single coarse microbial fuel cells prepared in Example 1 were connected in a continuous flow manner to measure changes in organic matter and nitrogen concentration under actual sewage conditions.

In a continuous flow microbial fuel cell system, the hydraulic residence time of each unit unit was set at 0.5 hour, and the total hydraulic retention time of the system was maintained at 1.5 hours. The actual organic matter concentration of sewage was 142 ± 11 mg-COD / L and the nitrogen concentration was 29 ± 1 mg-N / L. The measurement results are shown in Fig.

As shown in FIG. 8, the effluent organic concentration of the first unit (unit-1) was 70 ± 5 mg-COD / L and the nitrogen concentration was 14 ± 2 mg-N / , The effluent organic matter concentration of the third unit (unit-3) was 29 ± 3 mg-COD / L, the nitrogen concentration was 3 ± 1 mg-N / (20 mg-N / L or less in nitrogen and less than 40 mg-COD / L in organic matter). The concentration of organic matter and nitrogen in the effluent was 2 ± 0 mg-N / L.

Therefore, the single-celled microbial fuel cell according to the present invention can maintain the concentration of organic matter and nitrogen at the domestic sewage water quality standard (without detriment of additional aeration cost (organic matter removal, nitrification) and external carbon source cost It is economical and can additionally produce electric energy, so that it can be applied to an actual sewage system in place of the conventional sewage treatment.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

10: oxidation electrode part
11: Inlet
12: Outlet
20: External framework
30: air reducing electrode
40: lead
50: membrane
60: oxidized electrode

Claims (7)

The present invention relates to a method for removing nitrogen oxides, which comprises the steps of introducing wastewater into an interior of a body, decomposing organic matters by electroactive microorganisms, nitrifying nitrogen by transmitted oxygen, An oxidizing electrode part for performing a biochemical electrochemical denitrification using some electrons generated by the oxidizing electrode part;
An oxidizing electrode which is provided on both outer sides of the oxidation electrode unit and performs electrochemical decomposition by the microorganisms attached to the electroactive microorganisms and moves the generated hydrogen and electrons to the air reducing electrode through the leads and the separator;
A separation membrane provided outside the oxidation electrode to electrically isolate the oxidation electrode from the air reduction electrode;
An air reducing electrode provided outside the separation membrane to react electrons moved from the oxidation electrode with external air to maintain the flow of electrons and to transmit oxygen to the oxidation electrode unit;
An outer frame provided outside the air reducing electrode; And
A conductor connected to the oxidizing electrode and the air reducing electrode, respectively, and exposed to the upper end of the cell;
A single-stage microbial fuel cell capable of simultaneously removing organic matter and nitrogen in wastewater. The method according to claim 1,
Wherein the microbial fuel cell is a type using an oxidation electrode and a separation membrane having a wide pore size, and is capable of simultaneously removing organic matter and nitrogen in the wastewater. The method according to claim 1,
Wherein the microbial fuel cell uses a large-sized air reducing electrode that occupies a majority of the outer frame except for the screw joint, and is capable of simultaneously removing organic matter and nitrogen in the wastewater. The method according to claim 1,
Wherein the microbial fuel cell is capable of simultaneously removing organic matter and nitrogen in the wastewater, wherein the air reducing electrode is located on both sides of the cell in a large area so that oxygen is spontaneously diffused. The method according to claim 1,
Wherein the microbial fuel cell comprises a plurality of unit modules arranged in a transverse direction at a predetermined interval so that the microbial fuel cells are connected to each other in a continuous flow manner, Microbial fuel cell. A method for simultaneous removal of organic matter and nitrogen in wastewater using the single-set microbial fuel cell of claim 1. The method according to claim 6,
The organic matter contained in the wastewater flowing into the oxidation reaction tank of the single-stage microorganism fuel cell is partially removed by the electroactive microorganisms attached to the oxidation electrode, and the generated electrons and hydrogen ions migrate to the air- At the same time, the ammonia nitrogen in the oxidation tank is nitrified by the oxygen permeated to the oxidized electrode portion in the air, and the heterotrophic denitrification using the residual organic matter as the electron donor and the bioelectrochemistry using some electrons generated by the electroactive microorganisms A method for simultaneous removal of organic matter and nitrogen in wastewater using a single-stage microbial fuel cell, comprising removing organic matter and nitrogen by a denitrification reaction.

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