KR20190047465A - Descending type microbial fuel cell system and method of operation thereof - Google Patents

Abstract

A descending type microbial fuel cell system according to an embodiment of the present invention comprises: a reactor including a male screw portion having a first hollow portion formed with a substrate inlet; a reactor holder having a second hollow portion corresponding to the first hollow portion and forming a substrate outlet; a reaction region connecting the first hollow portion of the male screw portion and the second hollow portion of the reactor holder to connect the substrate inlet and the substrate outlet; and a collection tank disposed below the substrate outlet. An air gap is provided between the substrate outlet and the collection tank. A first electrode and a second electrode which are disposed to face each other and a ceramic separation membrane disposed between the first electrode and the second electrode are disposed in the reaction region. The reactor, reactor holder, air gap, and collection tank are vertically arranged. According to the present invention, the recovery rate of Struvite can be enhanced.

Description

Described microbial fuel cell system and method of operating the same

The present invention relates to a descending type microbial fuel cell system and a method of operating the same. More particularly, the present invention relates to a descending type microbial fuel cell system, and more particularly, And more particularly, to a descending type microbial fuel cell system capable of improving the production capacity of struvite and improving the recovery rate of struvite, and a method of operating the same.

In order to effectively cope with the depletion of resources and energy, climate change, and the global warming crisis, it is necessary to take a holistic approach to environmental and energy issues. In other words, the problems of resource and energy depletion, climate change and global warming in this era are urging the inevitable change of traditional environment and energy technology.

Therefore, in order to expand human activities within the limits allowed by the Earth, it is necessary to shift to a sustainable system such as resource circulation.

In addition, by combining environmental pollution control technology, the realization of a resource recycling system applying the flow of matter and energy circulation, which is the principle of natural ecosystem, to human society is emerging as an alternative to sustainable development.

The technology to achieve this goal is called 'green technology' or 'industrial ecology technology'. In this system, which can reduce the environmental load while suppressing the consumption of natural resources, it is a circulating resource. Circulating resources represent valuable resources extracted from waste, and waste can be used as a source of new energy or material.

Wastes that can be recovered from useful resources are wastes that can only be generated by living human beings. In wastewater, wastewater may vary greatly depending on the characteristics of the wastewater, but generally there is a large amount of high organic matter content and high concentration of phosphorus and nitrogen such as phosphorus and nitrogen. While suggesting ways to recover the chemical energy and nutrients of organic matter, systems based on microbial fuel cells are being introduced intensively.

Microbial fuel cell (MFC) is a representative resource recycling system that was born from the breakthrough of life sciences, environmental biotechnology and electrochemistry. Microbial fuel cells can convert the potential chemical energy of oil / minerals present in wastewater to direct electrical energy using biocatalytic electrochemical reactions.

These microbial fuel cells recover useful energy from the pollutants used and abandoned by humans. Therefore, beyond the meaning of simple renewable energy, especially when the biocatalyst production technology of microbial fuel cells is connected with the wastewater treatment plant, It can greatly help facilities evolve into energy production facilities, or even energy-independent resource recycling systems.

In recent years, attempts have been made to recover not only electrical energy but also saline salts from wastewater based on the operation mechanism of a microbial fuel cell. Struvite is a typical type of recovered nutrient salt.

Struvite is a compound composed of phosphorus, nitrogen and magnesium, and can be used as a raw material for fertilizer, so that the market economy value is highly evaluated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to improve the production capacity of struvite by producing electricity at the upper part of the porous ceramic separator and generating struvite at the lower part, And to provide a descending type microbial fuel cell system capable of improving the recovery rate of tru bite.

Another object of the present invention is to provide a descending type microbial fuel cell system that can simplify necessary components and reduce the cost required for the construction of a system.

Another object of the present invention is to provide a descending type microbial fuel cell system capable of improving wastewater treatment capability based on characteristics of a porous ceramic membrane.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a descending type microbial fuel cell system including a reaction tank including a male thread portion having a first hollow portion formed with a substrate inlet, a first hollow portion corresponding to the first hollow portion, A reaction zone for joining the first hollow portion of the male screw portion and the second hollow portion of the reactor holder to connect the substrate inlet and the substrate outlet, and a reaction zone for connecting the substrate inlet and the substrate outlet A first electrode and a second electrode arranged opposite to each other in the reaction region and a second electrode disposed between the first electrode and the second electrode, A separation membrane is disposed, and the reaction vessel, the reactor holder, the air gap and the collection vessel are arranged vertically.

The reaction tank disposed above the ceramic separator with the ceramic separator interposed therebetween generates electricity, and the collecting tank disposed below the ceramic separator with the ceramic separator interposed therebetween generates struvite .

The externally threaded portion is formed in a ring shape and can be disposed integrally with the reaction tank.

The externally threaded portion is disposed so as to protrude from the lower surface of the reaction tank, the first hollow portion is disposed on the inner diameter of the male threaded portion, and the first screw is disposed on the outer diameter of the male threaded portion.

The reactor holder is disposed in a ring shape having an inner diameter and an outer diameter. A second screw is disposed in the inner diameter of the reactor holder, and the first screw and the second screw of the male screw portion can be coupled.

A gasket and a current collector may be further disposed in the reaction region.

The gasket may support / fix the collector, the first electrode, the second electrode, and the ceramic separator.

An electric element may further be connected to the first electrode and the second electrode.

The ceramic separator may be made of porous carbon, porous silicon (SiO2), porous titanium dioxide (TiO2), zeolite, a multi-layer ceramic filter, porous germanium (Ge) And at least one selected from these compounds.

The reaction tank may be provided with a first solution containing an electrochemically active microorganism.

The ceramic separation membrane may provide a second solution containing water and ions to the collection tank by advancing a positive osmotic pressure process on the first solution and filtering the first solution.

The precipitate of the second solution that has passed through the ceramic separator may be lowered into the collection tank.

The air gap may separate the second electrode from the collection tank.

The air gap may be spaced apart by a distance of 2 mm or more between the second electrode and the collecting bath.

An additive for controlling the pH range may be added to the collection tank.

The additive can be adjusted to form and maintain the pH of the second solution at pH 9-10.

The collection tank may be provided with an electrolyte solution.

The electrolyte solution may contain Mg < ² + >.

According to another aspect of the present invention, there is provided a method of operating a descending type microbial fuel cell system, comprising: providing a first solution to a reaction tank; generating electricity in the reaction tank; Introducing the second solution into a collecting bath, supplying an electrolyte to the second solution of the collecting bath to lower the precipitate in the collecting bath, Wherein the precipitate is Struvite.

The reaction tank disposed above the ceramic separator with the ceramic separator interposed therebetween generates electricity, and the collecting tank disposed below the ceramic separator with the ceramic separator interposed therebetween generates struvite .

The ceramic separator may be made of porous carbon, porous silicon (SiO2), porous titanium dioxide (TiO2), zeolite, a multi-layer ceramic filter, porous germanium (Ge) And at least one selected from these compounds.

The reaction tank may be provided with a first solution containing an electrochemically active microorganism.

Characterized in that the ceramic separation membrane is provided with a second solution containing water and ions by progressing a forward osmosis phenomenon with respect to the first solution and filtering the first solution, How the system works.

The precipitate of the second solution passing through the ceramic separator may be dropped in the collecting tank.

An air gap may be disposed between the reactor holder and the collecting bath.

The air gaps may be formed at intervals such that the reactor holder and the collecting bath are separated by a distance of 2 mm or more.

An additive for controlling the pH range may be added to the collection tank.

The additive can be adjusted to form and maintain the pH of the second solution at pH 9-10.

The collection tank may be provided with an electrolyte solution.

The electrolyte solution may include Mg ²⁺ .

The descending type microbial fuel cell system according to the embodiment of the present invention produces electricity at the upper part of the porous ceramic separator, and generates struvite at the lower part to produce the struvite production capacity It is possible to improve the recovery rate of struvite easily.

In addition, the descending type microbial fuel cell system according to the embodiment of the present invention can simplify necessary components and reduce the cost required for the construction of the system.

The descending type microbial fuel cell system according to the embodiment of the present invention can improve the wastewater treatment capability based on the characteristics of the porous ceramic membrane.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a perspective view illustrating a descending type microbial fuel cell system according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a descending type microbial fuel cell system according to an embodiment of the present invention.
3 is an exploded perspective view showing a reactor holder and a reaction tank of a descending type microorganism fuel cell system according to an embodiment of the present invention.
4 is a flowchart illustrating an operation method of a descending type microbial fuel cell system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as " comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a descending type microbial fuel cell system according to an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a descending type microbial fuel cell system according to an embodiment of the present invention, 1 is an exploded perspective view showing a reactor holder and a reaction tank of a descending type microorganism fuel cell system according to an embodiment.

1 to 3, a descending type microbial fuel cell system 10 according to an embodiment of the present invention includes a reactor holder 300 including a reaction region HA, a reaction tank 100, a collection tank 200, And an air gap AG.

The descending type microbial fuel cell system 10 may be vertically arranged in the order of the reactor 100, the reactor holder 350, the air gap AG, and the collecting tank 300.

In the descending type microbial fuel cell system 10, the reaction tank 100 disposed above the ceramic separator 350 with the ceramic separator 350 therebetween can generate electricity, and the ceramic separator 350 can be disposed between And the collecting tank 200 disposed below the ceramic separator 350 may generate struvite.

First, the reaction tank 100 may include a substrate inlet 140 formed on the lower surface of the reaction tank 100. The reaction tank 100 may include a male screw portion 150 protruding from the lower surface of the reaction tank 100 along the rim of the substrate inlet 140. The male screw part 150 may be formed integrally with the reaction tank 100.

Specifically, the first screw 155 is formed on the outer diameter of the male screw part 150, and the first hollow part 1100 is formed in the hollow part of the male screw part 150. The hollow part starts from the substrate inlet 140, To the end. In other words, the male screw part 150 is formed in the shape of a ring, and the length of the male screw part 150 may be the same or similar to the thickness of the reactor holder 300.

The reactor holder 300 may be arranged in a ring shape having an inner diameter and an outer diameter. Specifically, the reactor holder 300 may include a second screw 305 disposed in the inner diameter of the reactor holder 300, and a second hollow 1200 formed in the inner diameter of the reactor holder 300. The second hollow portion 1200 may be used as the substrate outlet 340.

Here, the first screw 155 of the male screw part 150 and the second screw 305 of the reactor holder 300 can be engaged. That is, the reactor 100 and the reactor holder 300 may be coupled through the first and second screws 155 and 305.

The combined reaction vessel 100 and the reactor holder 300 may form a reaction zone HA connecting the substrate inlet 140 and the substrate outlet 340. [ In other words, the first hollow portion 1100 and the second hollow portion 1200 may be combined to form a hollow reaction region HA.

The first electrode 310, the ceramic separator 350, and the second electrode 320 may be disposed in the hollow reaction region HA.

Meanwhile, the first solution 1000 may be disposed in the reaction tank 100. The first solution 1000 may include an electrochemically active microorganism. In other words, the first solution 1000 may be wastewater containing the electrochemically active microorganism.

The electrochemically active microorganism may be selected from the group consisting of Disulfovibrio vulgaris, Geobacter metallireducens, Geobacter sulfurreducens and Shewanella oneidensis And may be any one or a mixture of any one or more selected.

Electricity may be generated in the reaction tank 100 through the electrochemically active microorganisms. The electrochemically active microorganism may generate electrons by biodegrading the substrate.

An electron acceptor capable of receiving electrons generated therein is required, and the first electrode 310 may be disposed in the reaction region HA as the electron acceptor. Therefore, the former first electrode 310 can generate electricity through electrons generated by receiving electrons from the organic material.

The hollow formed in the lower surface of the reactor 100 in the reaction zone HA may serve as the substrate inlet 140 and the hollow formed in the lower surface of the reactor holder 300 may serve as the substrate outlet 370 have. In other words, the outlet and inlet of the hollow formed reaction zone (HA) can serve as substrate inlet 140 and substrate outlet 340, respectively.

As such, the first solution 1000 disposed in the reaction tank 100 may be disposed up to a portion of the substrate inlet 140 and the reaction region HA, which are the inlet of the reaction region HA. Accordingly, the first electrode 310 can be supported on the first solution 1000 due to the substrate outlet 140. That is, the first electrode 310 may be disposed on the first solution 1000 that is anaerobic due to the electrochemically active microorganisms.

In the first electrode 310, the electrochemically active microorganism may be attached to the electrode surface to form a biofilm. These electrochemically active microorganisms can transfer electrons generated by biodegradation of the substrate on the surface of the first electrode 310 to the first electrode 310.

The first electrode 310 is always wetted with the first solution 1000 containing electrochemically active microorganisms such as wastewater or is carried on the electrolyte and may have an influence such as resistance increase due to corrosion. Therefore, the first electrode 310 has a large surface area to facilitate the attachment of the electrochemically active microorganism, and it must be able to transfer electrons quickly.

A second electrode 320 disposed opposite to the first electrode 310 may be disposed in the reaction region HA. The ceramic separator 350 may be disposed between the first electrode 310 and the second electrode 320.

Specifically, gaskets 380 and 390 may be disposed symmetrically around the ceramic separator 350 in the reaction region HA.

The gasket may be disposed in a ring shape and may include a first gasket 380 disposed adjacent the substrate outlet 140 and a second gasket 390 disposed adjacent the substrate outlet 340 . The first and second gaskets 380 and 390 may be disposed to be coupled to the first and second screws 155 and 305.

The first and second gaskets 380 and 390 can improve the bonding force between the reactor holder 300 and the male screw part 150 and prevent the solution such as the first solution 1000 from leaking into the reaction area HA .

The first and second gaskets 380 and 390 are connected to the first and second electrodes 310 and 320 and the first and second collectors 360 and 370 and the ceramic separator 350 disposed in the reaction region HA. / RTI > In other words, since the first and second electrodes 310 and 320, the first and second collectors 360 and 370, and the ceramic separator 350 are disposed in the hollow of the reaction region HA, , Two gaskets 380 and 390 are preferably arranged on the upper and lower sides of the reaction region HA.

The first gasket 360 may be disposed below the first gasket 380 and the second gasket 370 may be disposed above the second gasket 390. Specifically, the first collector 360 may be disposed between the first electrode 310 and the first gasket 380, and the second collector 370 may be disposed between the second electrode 320 and the second gasket 390 As shown in FIG. Here, the first and second collectors 360 and 370 may be arranged in a mesh shape, but the present invention is not limited thereto, and any shape can be used as long as the collector can collect electricity.

The first electrode 310 may be disposed under the first collector 360. The first electrode 310 must have high electrical conductivity, low resistance, no toxicity to the microorganism, high biocompatibility with the microorganism, chemical stability, corrosion. Also, it is preferable that the specific surface area per unit volume is large, the first electrode 310 should be free from clogging due to microbial growth, and can be easily enlarged. In some cases, the first electrode 310 can improve microbial adhesion and electron transferability through a pretreatment to improve the above-described conditions.

The ceramic separator 350 may be disposed under the first electrode 310. In other words, the ceramic separator 350 may be disposed between the first electrode 310 and the second electrode 320.

First, the second electrode 320 may be a cathode electrode. The second electrode 320 may move the electrons generated from the first electrode 310 to the second electrode 320 through the external conductor 750.

Here, the electronic device 700 may be disposed on the external conductor 750 connected to the first electrode 310 and the second electrode 320. The electronic device 700 may be, but is not limited to, a capacitor. It is preferable that the second electrode 320 has a high oxidation-reduction potential capable of widening the specific surface area per unit volume and capturing the proton easily.

The ceramic separator 350 separates the first electrode 310 and the second electrode 320, and a porous material can be used.

The ceramic separator 350 can mechanically separate the first electrode 310 and the second electrode 320 from each other to prevent the substrate supplied to the first electrode 310 from flowing into the second electrode 320, It is possible to prevent the oxygen from being introduced into the first electrode 310, which is in an established state.

The ceramic separator 350 may be made of a porous material such as porous carbon, porous silicon (SiO2), porous titanium dioxide (TiO2), zeolite, a multi-layer ceramic filter, porous germanium (Ge) A carrier, and a compound of these.

The ceramic separator 350 can advance the first osmosis phenomenon with respect to the first solution 1000. Then, the first solution 1000 may be filtered to form the second solution 2000. That is, the ceramic separator 350 may form and drop a second solution 2000 containing water and ions in the electrochemically active microorganism to provide the second solution 2000 in the direction of the collection tank 200. Here, the second solution 2000 may be an electrolytic solution in which ions are dissociated in water.

The second solution 2000 having passed through the ceramic separator 350 may pass through the second electrode 320 and be filled into the collecting bath 200. The second solution 200 can be supplied to the collecting bath 200 through the second electrode 310 and the substrate outlet 340 through only the water and ions smaller than the pores of the ceramic separator 350 have.

Here, an air gap AG may be disposed between the substrate outlet 340 and the collecting bath 200. The air gap AG prevents the second electrode 320 from being separated from the collecting bath 200 to prevent struvite generation inside the reactor holder 300.

The air gap AG is disposed between the collecting bath 200 and the second electrode 320 so that the ions injected to the collecting bath 200 to control the magnesium ion and the pH are supplied to the second electrode 320 It is possible to prevent the formation of struvite on the interior of the reactor holder 300, specifically on the second electrode 320 as it can prevent diffusion into the placed reactor holder 300, specifically the reaction zone HA .

For example, conventionally, struvite crystals were formed on the surface of the second electrode (cathode) inside the reactor. That is, when attempting to recover the strain based on the conventional system, there is a problem that the operation of the system must be stopped.

In the case of a system using two ion exchange membranes and a system using three chambers, when operating a system of microbial fuel cells operated by three reactors using two separate membranes, Truebite could be created.

Further, in order to constitute a system of a conventional microbial fuel cell, a separation membrane having two different ion exchange capacities should be used, and an economical problem may arise because three reaction vessels must be formed. In addition, there was a problem that the operation of the operating system had to be stopped in order to recover the struvite generated in the middle reactor.

In addition, when the injected ions that induce the reaction to generate struvite are diffused into the other two reaction vessels through the ion exchange membrane in the middle reaction tank, There was a disadvantage that it had an adverse effect.

In the case of a dual-chamber or single-chamber system using one ion-exchange membrane as an alternative, in the case of a microbial fuel cell system operating on one ion-exchange membrane, Although struvite is produced, it is very likely to be an unpurified compound, and the production capacity of struvite could be very low compared to systems using two ion exchange membranes. In addition, in order to recover the struvite generated by the system, not only the operation of the reactor has to be stopped, but also there has been a problem of disassembling the reactor due to the configuration of the system.

As described above, in the conventional microbial fuel cell system, there is a disadvantage that it is difficult to recover struvite crystals generated on the electrode surface in the reactor, and there is a disadvantage that it is difficult to efficiently recover the struvite crystals.

However, the system 10 of the microbial fuel cell according to the present invention can be applied to the reactor holder 300, specifically the reaction zone HA, by placing an air gap AG separating the second electrode 320 from the collecting bath 200. [ It is possible to prevent the struvite 290 from being generated in the inside of the collecting tank 200 and to generate the struvite 290 in the collecting tank 200 to facilitate the recovery.

The air gap AG is formed by separating the second electrode 320 and the collecting tank 200 from each other in the range of 2 mm or more so as to prevent the generation of the struvite 290 on the second electrode 320 .

When the air gap AG is disposed in a range of less than 2 mm, the second electrode 320 and the collecting bath 200 are disposed too close to each other, and struvite is formed on the surface of the second electrode 320 May occur.

A support 900 may further be disposed at an edge region of the reaction tank 100 and the collecting tank 200 to maintain an air gap AG between the second electrode 320 and the collecting tank 200.

On the other hand, on the second solution 2000 filled in the collecting tank 200, an additive may be provided for controlling the magnesium ion or the pH. Here, the additive is referred to as an electrolyte 250 to control magnesium ions or pH.

Magnesium ions may be added to the second solution 2000 because the wastewater often contains an amount smaller than the required amount of magnesium for precipitating struvite. That is, the precipitation of struvite may not be easy due to the lack of magnesium ions on the second solution 2000. Therefore, the electrolyte 250 containing magnesium ions may be provided on the second solution 2000 to facilitate the precipitation of struvite.

Then, the electrolyte 250 may be added to adjust the pH of the second solution 2000. Specifically, the electrolyte 250 can be adjusted so that the pH of the second solution 2000 can be formed and maintained at an appropriate pH of 9 to 10 to increase the recovery of struvite.

Therefore, the precipitate 290 precipitated from the second solution 2000 can be precipitated in the collecting tank 200. The precipitate 250 may be struvite.

As described above, the descending type microbial fuel cell system 10 according to the embodiment of the present invention produces electricity in the reaction tank 100 through the porous ceramic separator 350, It is possible to improve the production capacity of Struvite and easily improve the recovery rate of Struvite by generating Struvite.

In addition, the descending type microbial fuel cell system 10 according to the embodiment of the present invention can simplify necessary components to reduce the cost required for the system configuration, Can be improved.

4 is a flowchart illustrating an operation method of a descending type microbial fuel cell system according to an embodiment of the present invention.

Here, FIG. 4 avoids redundant description and will be described with reference to FIGS. 1 to 3 for ease of explanation.

4, the first solution 1000 is provided to the reaction tank 100 (S100), the electricity is generated in the reaction tank 100 (S200), the first solution 1000 is supplied to the reactor holder 100, (S400) of flowing the second solution 2000 into the collecting tank 200, and collecting the collected solution 200 in the collecting tank 200, (S500) of supplying the electrolyte (250) to the second solution (2000) of the collecting bath (200) to lower the precipitate (290) in the collecting bath (200). Here, the precipitate 290 may be struvite.

In other words, the reaction tank 100 disposed above the ceramic separator with the ceramic separator 350 therebetween through the operation method of the descending type microorganism fuel cell system 10 according to the embodiment of the present invention generates electricity, The collecting tank 200 disposed below the ceramic separating film 350 with the ceramic separating film 350 therebetween can generate struvite.

In step S100 of providing the first solution 1000 to the reaction tank 100, the reaction tank 100 may be provided with a first solution 1000 containing an electrochemically active microorganism. The first solution 1000 may be wastewater.

A step S300 of flowing the first solution 1000 into the ceramic separator 350 disposed in the reactor holder to form a second solution 2000 and a step of flowing the second solution 2000 into the collecting tank 200 The ceramic separator 350 may be formed of porous carbon, porous silicon (SiO2), porous titanium dioxide (TiO2), zeolite, a multi-layer ceramic filter, porous germanium (Ge), a porous carrier, and a compound thereof.

The first solution 1000 is filtered through the ceramic separator 350 and the second solution 2000 containing water and ions is filtered through the collecting vessel 200 ).

Meanwhile, an air gap AG may be disposed between the reactor holder 300 and the collecting tank 200. Here, the air gap AG may be formed at intervals of 2 mm or more apart from the reactor holder 300 and the collecting tank 200.

The air gap AG prevents the second electrode 320 from being separated from the collecting bath 200 to prevent struvite generation inside the reactor holder 300.

The air gap AG is disposed between the collecting bath 200 and the second electrode 320 so that the ions injected to the collecting bath 200 to control the magnesium ion and the pH are supplied to the second electrode 320 It is possible to prevent the formation of struvite on the interior of the reactor holder 300, specifically the second electrode 320, as can be prevented from diffusing into the placed reactor holder 300, specifically the reaction zone HA have.

In step S500 of providing the electrolyte 250 to the second solution 2000 of the collecting bath 200 and lowering the precipitate 290 in the collecting bath 200, Can be provided.

The precipitation of struvite may not be easy due to the lack of magnesium ions on the second solution 2000. Therefore, an electrolyte 250 containing magnesium ions may be provided on the second solution 2000 to utilize the precipitation of struvite.

Then, the electrolyte 250 may be added to adjust the pH of the second solution 2000. Specifically, the electrolyte 250 can be adjusted so that the pH of the second solution 2000 can be formed and maintained at an appropriate pH of 9 to 10 to increase the recovery of struvite.

Therefore, the precipitate 290 of the second solution 2000 can be precipitated in the collecting tank 200. The precipitate 250 may be struvite.

As described above, the operation method of the descending type microorganism fuel cell system 10 according to the embodiment of the present invention produces electricity in the reaction tank 100 with the porous ceramic separator 350 interposed therebetween, By creating Struvite, it is possible to improve the production capacity of Struvite and easily improve the recovery rate of Struvite.

In addition, the descending type microbial fuel cell system 10 according to the embodiment of the present invention can simplify necessary components to reduce the cost required for the system configuration, Can be improved.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: Strong Type Microbial Fuel Cell System
100: reaction tank 140: substrate inlet
150: male threads 155: first screw
200: collection tank 250: electrolyte
290: Precipitates 300: Reactor holder
305: second screw 310: first electrode
320: second electrode 340: substrate outlet
350: ceramic separator 360: first collector
370: Second collector 380: First gasket
390: second gasket 700: electronic element
750: outer conductor 1000: first solution
1100: first hollow part 1200: second hollow part
2000: second solution AG: air gap
HA: Reaction zone

Claims (30)

A reaction vessel including a male screw portion having a first hollow portion forming a substrate inlet;
A reactor holder having a second hollow portion corresponding to the first hollow portion and forming a substrate outlet;
A reaction zone connecting the first hollow portion of the male screw portion and the second hollow portion of the reactor holder to connect the substrate inlet and the substrate outlet; And
A collection tank disposed below the substrate outlet; , ≪ / RTI &
An air gap is disposed between the substrate outlet and the collecting tank,
A first electrode and a second electrode disposed opposite to each other in the reaction region, and a ceramic separator disposed between the first electrode and the second electrode,
Wherein the reactor, the reactor holder, the air gap, and the collection vessel are arranged vertically. The method according to claim 1,
The reaction tank disposed above the ceramic separator with the ceramic separator interposed therebetween generates electricity,
And the collecting bath disposed below the ceramic separator with the ceramic separator interposed therebetween generates a struvite. The method according to claim 1,
Wherein the male screw portion is formed in a ring shape and is disposed integrally with the reaction tank. The method according to claim 1,
Wherein the male screw portion is disposed so as to protrude from a lower surface of the reaction tank, the first hollow portion is disposed on an inner diameter of the male screw portion, and the first screw is disposed on an outer diameter of the male screw portion. 5. The method of claim 4,
Wherein the reactor holder is disposed in a ring shape having an inner diameter and an outer diameter, a second screw is disposed on an inner diameter of the reactor holder,
Wherein the first screw of the male screw portion and the second screw are engaged with each other. The method according to claim 1,
Wherein the reaction zone is further provided with gaskets and current collectors. The method according to claim 6,
Wherein the gasket supports / fixes the collector, the first electrode, the second electrode, and the ceramic separator. The method according to claim 1,
Wherein the first electrode and the second electrode are further connected to an electric element. The method according to claim 1,
The ceramic separator may be made of porous carbon, porous silicon (SiO2), porous titanium dioxide (TiO2), zeolite, a multi-layer ceramic filter, porous germanium (Ge) And at least one selected from the group consisting of these compounds. The method according to claim 1,
Wherein the reaction tank is provided with a first solution containing an electrochemically active microorganism. The method according to claim 1,
In the ceramic separator,
Wherein the first solution is subjected to a positive osmotic pressure process and the first solution is filtered to provide a second solution containing water and ions to the collecting tank. 12. The method of claim 11,
Wherein the precipitate of the second solution passing through the ceramic separation membrane is lowered into the collection tank. The method according to claim 1,
The air gap
And separating the second electrode from the collecting tank. The method according to claim 1,
Wherein the air gap is disposed at a distance spaced apart by a distance of 2 mm or more between the second electrode and the collecting bath. The method according to claim 1,
Characterized in that an additive for adjusting the pH range is added to the collection tank. 16. The method of claim 15,
Wherein the additive is configured to form and maintain the pH of the second solution at a pH of from 9 to 10. < RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Wherein the collection vessel is provided with an electrolyte solution. 18. The method of claim 17,
Wherein the electrolyte solution comprises Mg < ² + >. Providing a first solution to the reaction vessel;
Generating electricity in the reaction vessel;
Introducing the first solution into a ceramic separator disposed in a reactor holder to form a second solution;
Flowing the second solution into a collection tank;
Providing an electrolyte in the second solution of the collecting bath to descend the precipitate in the collecting bath; , ≪ / RTI &
Wherein the precipitate is struvite. ≪ RTI ID = 0.0 > 11. < / RTI > 20. The method of claim 19,
The reaction tank disposed above the ceramic separator with the ceramic separator interposed therebetween generates electricity,
Wherein the collection vessel disposed below the ceramic separation membrane with the ceramic separation membrane therebetween generates struvite. ≪ RTI ID = 0.0 > 11. < / RTI > 20. The method of claim 19,
The ceramic separator may be made of porous carbon, porous silicon (SiO2), porous titanium dioxide (TiO2), zeolite, a multi-layer ceramic filter, porous germanium (Ge) And at least one selected from the group consisting of these compounds. 20. The method of claim 19,
Wherein the reaction tank is provided with a first solution containing an electrochemically active microorganism. 20. The method of claim 19,
In the ceramic separator,
Wherein the first solution is advanced to a positive osmotic pressure and the first solution is filtered to provide a second solution containing water and ions to the collection tank. 20. The method of claim 19,
Wherein the precipitate of the second solution passing through the ceramic separation membrane is lowered into the collection tank. 20. The method of claim 19,
Wherein an air gap is disposed between the reactor holder and the collecting bath. 26. The method of claim 25,
Wherein the air gap is formed at a distance spaced apart from the reactor holder by a distance of 2 mm or more. 20. The method of claim 19,
Characterized in that an additive to control the pH range is added to the collection vessel. 28. The method of claim 27,
Wherein the additive is adapted to form and maintain a pH of the second solution at a pH of from 9 to 10. < RTI ID = 0.0 > 11. < / RTI > 20. The method of claim 19,
Wherein the collection vessel is provided with an electrolyte solution. ≪ RTI ID = 0.0 > 11. < / RTI > 30. The method of claim 29,
^Wherein the electrolyte solution comprises Mg < ^{2 + &} gt ;.

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