CN116102158A - A modular microbial fuel cell constructed wetland system - Google Patents

Abstract

The invention discloses a modularized microbial fuel cell type constructed wetland system, which relates to the technical field of water pollution control and water treatment and comprises a water inlet channel, a wetland treatment area and a water outlet channel which are sequentially connected, wherein the wetland treatment area comprises a plurality of treatment units which are arranged in parallel, the water inlets of the treatment units are connected with the water inlet channel, the water outlets of the treatment units are connected with the water outlet channel, each treatment unit comprises a plurality of microbial fuel cells which are connected in series, the two ends of each microbial fuel cell are respectively provided with a water inlet and a water outlet, the water inlet side and the water outlet side are respectively provided with electrode leading-out ends with opposite polarities, the water inlets and the water outlets of adjacent microbial fuel cells are detachably connected, and the electrode leading-out ends with opposite polarities of the adjacent microbial fuel cells are detachably connected. The invention can utilize the microbial fuel cell to enhance the organic matter degradation capability and degradation rate of the wetland system, and can ensure the electric energy output of the microbial fuel cell on the basis of solving the blockage problem.

Description

A modular microbial fuel cell constructed wetland system

technical field

The invention relates to the technical field of water pollution control and water treatment, in particular to a modular microbial fuel cell artificial wetland system.

Background technique

Constructed wetlands are composed of wetland plants, fillers and microbial communities to remove pollutants in water through physical, chemical and biological synergies. As a low-cost, low-energy ecological sewage treatment technology, constructed wetlands have significant advantages in the application of sewage (waste) water treatment and ecological restoration of slightly polluted water bodies, especially in recent years in the construction of sponge cities, the treatment of black and odorous water bodies and Rural sewage treatment has been rapidly developed and recognized. However, constructed wetlands also have problems such as low organic load, large floor area, and easy blockage after long-term operation, which have become factors restricting the development of constructed wetland technology.

During the long-term operation of constructed wetlands, phenomena such as clogging, short flow, and matrix adsorption saturation will occur, which will reduce the wetland treatment capacity. Faced with the above problems, the traditional solution is to backwash the wetlands, or replace fillers and plants, but there are operations Complexity and high cost, long post-event wetland system recovery period, poor stability and other issues. At present, there are more researches on the solution of wetland modularization, which realizes partial replacement/flush through modular detachment and partial separation, so as to simplify operation, reduce cost, and reduce system stability damage. For example, the Chinese patent application publication number CN105858900A discloses a modular grid-type combined constructed wetland system, which includes a sequentially connected water inlet distribution area, wetland system treatment area, and effluent collection area. The wetland system treatment area includes multiple A treatment unit composed of grid-type wetland tanks in series, each treatment unit is connected to a water outlet on the water inlet distribution area, and the water outlet of the treatment unit is connected to the outlet water collection area, and the outlet of the water inlet distribution area Both the water surface and the water inlet surface of the effluent collection area are provided with perforated water distribution partitions. This solution can be partially replaced or adjusted when the constructed wetland is partially blocked, so as to reduce the overall impact on the wetland system, but this can only solve the problem of blockage, but cannot effectively improve the processing capacity of the wetland and reduce the land occupation.

Introduce microbial fuel cell technology in constructed wetlands, build a reasonable battery cell, and use the microbial community in the wetland to form various effects such as electrode-microbe electrode effect, plant-microbe rhizosphere effect, and matrix-microbe biofilm effect. The degradation of pollutants is promoted by electrogenic microorganisms to enhance the removal capacity of constructed wetlands, and at the same time, the organic matter energy of pollutants is converted into electrical energy and collected. For example, the application publication number is that the Chinese patent of CN113540542A discloses a kind of artificial wetland microbial battery, comprises downflow reactor, anode and air cathode; The inner chamber of the reactor is divided into two parts, the upper chamber and the lower chamber; the upper chamber and the lower chamber are filled with gravel and anaerobic sludge; the anode and the air cathode are respectively arranged at the bottom and top of the downflow reactor; the anode includes the first stainless steel A mesh and a first graphite felt, the first graphite felt is arranged outside the first stainless steel mesh; the air cathode includes a second stainless steel mesh and a second graphite felt, and the second stainless steel mesh is wrapped outside the second graphite felt. The purpose of this solution is to not need to plant plants, and set its supporting gravel to reduce sludge clogging, but clogging will still occur during actual operation, and there will still be defects of low output voltage and power. At the same time, blockage will increase the internal resistance of the matrix, affect the transfer efficiency of electrons/protons, and also affect the power output of electrogenic bacteria, which is not conducive to the transfer of electrons/protons, increases the internal resistance of the battery, and affects the power generation efficiency.

At present, the research on the coupling technology of the above-mentioned constructed wetlands and microbial fuel cells is mostly limited to how to increase the weak voltage and effectively output and utilize it, but there is nothing to do about its clogging problem.

Contents of the invention

The purpose of the present invention is to provide a modular microbial fuel cell artificial wetland system to solve the problems of the above-mentioned prior art. The microbial fuel cells are connected in series to form treatment units, and several treatment units are connected in parallel to form a wetland treatment area, which can utilize microbial fuel The battery enhances the organic matter degradation capacity and degradation rate of the wetland system. At the same time, the microbial fuel cell at the clogged position can be replaced to ensure the electrical energy output of the microbial fuel cell on the basis of solving the clogging problem.

To achieve the above object, the present invention provides the following scheme:

The present invention provides a modular microbial fuel cell constructed wetland system, which includes sequentially connected water inlet channels, wetland treatment areas and outlet channels. The wetland treatment area includes several processing units arranged in parallel, and the water inlets of the processing units Connect the water inlet channel, the water outlet of the treatment unit is connected to the water outlet channel, each of the treatment units includes a number of microbial fuel cells connected in series, and the two ends of the microbial fuel cell are respectively provided with a water inlet and a water outlet , and the electrode leads with opposite polarities are respectively arranged on the water inlet side and the water outlet side, the water inlet and the water outlet of the adjacent microbial fuel cells are detachably connected, and the polarities of the adjacent microbial fuel cells are opposite The electrode leads are detachably connected.

Preferably, the microbial fuel cell is divided into A-type modules, B-type modules and C-type modules according to different connection parts, the two ends of the A-type module are respectively provided with first connection parts, and the two ends of the B-type module The two ends of the C-shaped module are respectively provided with a second connection part, and the two ends of the C-shaped module are respectively provided with a first connection part and a third connection part, and the first connection part is connected with the second connection part, and the third connection part is connected with the second connection part. The part is connected with the water inlet channel or the water outlet channel.

Preferably, the first connecting part includes a card board, first holes distributed on the card board, and a conductive plug arranged in the middle of the card board, and the second connecting part includes a The card slot, the second hole distributed on the card slot, and the conductive box arranged in the middle of the card slot, the conductive plug and the conductive box are respectively connected to different electrodes, and the conductive plug and the The conductive plug box can be connected after the card board is plugged and connected to the card slot.

Preferably, the card slot includes a chute on both sides and a limit slot on the bottom, the two sides of the card board are respectively provided with first insertion parts corresponding to the chute, and the card board The bottom is provided with a second insertion part corresponding to the limiting groove.

Preferably, a plurality of rollers are arranged sequentially along the insertion direction of the first plug-in part, and a slideway is provided on one side of the sliding groove corresponding to the rollers.

Preferably, the other side of the chute and the other side of the limiting groove are provided with rubber pads, and after the roller enters the slideway, the back surface of the first insertion part is attached to the rubber pad. Pad.

Preferably, the third connecting portion includes a fixing ring, guide rods are provided at the water inlet channel and the water outlet channel, and the fixing ring can be inserted into the guide rods by moving downward.

Preferably, the third connecting portion includes a downwardly facing socket hole communicating with the inside of the microbial fuel cell, and the water inlet channel and the water outlet channel are connected with vertically upward water pipes, and the water channel A switch valve is arranged on the water pipe, and the socket hole is inserted downward into the water pipe to realize communication.

Preferably, the microbial fuel cell includes a packing bed and wetland plants, the packing bed includes a support layer arranged from bottom to top, a middle matrix layer, and an upper matrix layer, the bottom of the middle matrix layer is laid with an anode material, the A cathode material is laid on the top of the upper matrix layer, and the cathode material and the anode material are respectively connected to different electrode leads, and wetland plants are planted in the upper matrix layer.

Preferably, the supporting layer is 20 cm thick, and the matrix is gravel and gravel with a particle size of φ16 to 30 mm; the middle matrix layer is 35 cm thick, and the matrix is gravel and zeolite with a particle size of φ4 to 15 mm; the upper matrix layer is thick The substrate is coarse sand or soil with a small particle size; the wetland plants are reeds, calamus, and canna; the cathode material and the anode material are activated carbon layers or graphite blankets.

Compared with the prior art, the present invention has achieved the following technical effects:

(1) In the present invention, microbial fuel cells are connected in series to form processing units, and several processing units are connected in parallel to form a wetland treatment area. Microbial fuel cells can be used to enhance the organic matter degradation capacity and degradation rate of the wetland system. At the same time, the microbial fuel cells at the blocked position can be replaced to On the basis of solving the blockage problem, the electric energy output of the microbial fuel cell is guaranteed; therefore, the present invention can not only solve the wetland blockage problem, but also improve the wetland treatment capacity, and can also convert organic matter into electric energy output and utilization;

(2) The present invention divides the microbial fuel cell into A-type modules, B-type modules and C-type modules, and can utilize the difference of the connection parts that each module is provided with to realize the connection between each module and between the modules and the water inlet and the water outlet. Convenient connection, easy to take out and replace the clogged microbial fuel cell;

(3) The present invention utilizes the cooperation of the card slot and the card board to realize the plug-in connection of adjacent microbial fuel cells, and the card slot includes slide grooves on both sides and a limiting groove at the bottom. After the plug-in connection, a semi-enclosed structure can be formed on the bottom and both sides, and the first hole and the second hole are connected in the semi-enclosed structure to ensure the sealing of the connection and realize the smooth flow of water in accordance with the serial sequence of the microbial fuel cell. Ensure the treatment effect of the wetland system;

(4) The present invention can utilize the cooperation of the roller and the slideway when installing the clamping plate and the clamping groove to realize accurate, fast and labor-saving positioning of the clamping plate and the clamping groove assembly and disassembly, and adopt the vertical loading and unloading connection mode to facilitate microbial fuel Take out and install the battery; in addition, a rubber pad is provided in the chute, and after installing the card board and the card slot, the first insertion part of the card board can be attached to the rubber pad by using rollers to form a relatively closed semi-enclosed structure The communication space further improves the sealing performance of the communication between adjacent microbial fuel cells.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the plane layout diagram of the constructed wetland system of the present invention;

Fig. 2 is the structural diagram of microbial fuel cell of the present invention;

Fig. 3 is a schematic diagram of the structure of the A-type module of the present invention;

Fig. 4 is a schematic diagram of the B-type module structure of the present invention;

Fig. 5 is a schematic structural diagram of a C-type module of the present invention;

Fig. 6 is a combined top view of the A-type module and the B-type module of the present invention;

Fig. 7 is the front view of Fig. 6;

Figure 8 is a schematic diagram of the connection between the C-type module and the water inlet/outlet of the present invention;

Fig. 9 is a schematic diagram of the specific layout of the processing unit of the present invention;

Among them, 1. water inlet; 11. guide rod; 12. water pipe; 2. processing unit; 21. A-type module; 211. first connecting part; 2111. roller; 2112. conductive plug; 22, B-type module; 221, second connection part; 2211, slideway; 2212, conductive box; 2213, second hole; 2214, chute; 2215, limit groove; 2216, rubber pad; 23, C type Module; 231, third connection part; 2311, socket hole; 2312, fixed ring; 3, outlet channel; 4, wetland treatment area; 5, cathode material; 6, anode material; 7, upper matrix layer; 8, middle layer Substratum layer; 9. Supporting layer; 10. Wetland plants.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a modular microbial fuel cell constructed wetland system to solve the problems existing in the prior art. Microbial fuel cells are connected in series to form treatment units, and several treatment units are connected in parallel to form a wetland treatment area, which can utilize microbial fuel cells Enhance the organic matter degradation capacity and degradation rate of the wetland system. At the same time, the microbial fuel cell at the clogged position can be replaced to ensure the electrical energy output of the microbial fuel cell on the basis of solving the clogging problem.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 9, the present invention provides a modular microbial fuel cell constructed wetland system, which includes sequentially connected water inlet canal 1, wetland treatment area 4 and water outlet canal 3, each area is formed by enclosure, The water inlet channel 1 is used to collect waste water or sewage to be treated and distribute it to the wetland treatment area 4 , and the water outlet channel 3 collects the treated water flowing out of the wetland treatment area 4 and then flows out. The wetland treatment area 4 includes several treatment units 2 arranged in parallel. Each processing unit 2 includes several microbial fuel cells connected in series. Microbial fuel cells can use microorganisms to directly convert chemical energy in organic matter into electrical energy output. Since microorganisms consume organic matter, it can improve the degradation capacity of the system to a certain extent, that is, reduce probability of blockage. The two ends of the microbial fuel cell are respectively provided with a water inlet and a water outlet, and electrode leads with opposite polarities are respectively arranged on the water inlet side and the water outlet side, and the water inlet and water outlet of adjacent microbial fuel cells are detachably connected. Realize the flow channel of the treated water. The lead ends of electrodes with opposite polarities of adjacent microbial fuel cells are detachably connected to realize the series connection of microbial fuel cells, which can increase the output voltage/current and ensure the output and utilization of electric energy. At the same time, different processing units 2 are connected in parallel, and the way of series-parallel combination can be changed according to requirements to realize the diversity of series-parallel combination, which can meet the different requirements of external circuits for voltage and current, and has wider adaptability. In the present invention, microbial fuel cells are connected in series to form a processing unit 2, and several processing units 2 are connected in parallel to form a wetland treatment area 4. The microbial fuel cells can be used to enhance the organic matter degradation capacity and degradation rate of the wetland system. At the same time, when the system is blocked, only local Replacement of clogged microbial fuel cells avoids the overall replacement of traditional constructed wetland systems and reduces operation and maintenance costs. In addition, by replacing the microbial fuel cell at the clogged position, the poor electron/proton transmission and internal resistance increase caused by the clogging can be avoided, which is conducive to the continuous output of electric energy. Therefore, the invention can not only solve the wetland blockage problem, but also improve the wetland treatment capacity, and can also convert organic matter into electric energy for output and utilization.

As shown in Figures 3 to 5, microbial fuel cells can be divided into A-type modules 21, B-type modules 22, and C-type modules 23 according to different connection parts. The two ends of the A-type module 21 are respectively provided with first connection parts 211, Both ends of the B-type module 22 are respectively provided with a second connection portion 221 , and both ends of the C-type module 23 are respectively provided with a first connection portion 211 and a third connection portion 231 . The first connection part 211 is connected to the second connection part 221 to realize the connection between the A-type module 21 and the B-type module 22 , or realize the connection between the C-type module 23 and the B-type module 22 . The third connecting part 231 is connected to the water inlet 1 to realize the connection between the C-shaped module 23 and the water inlet 1 , or the third connecting part 231 is connected to the outlet 3 to realize the connection between the C-shaped module 23 and the outlet 3 . Therefore, through the above-mentioned setting method, any form of CBABC to CBABA...ABC can be combined in series to form a processing unit 2 . As shown in FIG. 9 , it can be combined into a structural form in which the water inlet channel 1 passes through the CBABABC processing unit 2 and then reaches the water outlet channel 3 .

As shown in Figures 3-7, the first connecting part 211 may include a card board, first holes 2113 distributed on the card board, and a conductive plug 2112 arranged in the middle of the card board, and the first holes 2113 are arranged according to the set position and water flow. The difference in direction can be used as water inlet or water outlet. The second connecting part 221 includes a card slot matched with the card board, second holes 2213 distributed on the card slot, and a conductive box 2212 arranged in the middle of the card slot. The second hole 2213 is different according to the location and the direction of water flow. Can be used as water inlet or water outlet. The conductive plug 2112 can be used as a cathode or an anode, and the conductive plug box 2212 can also be used as a cathode or an anode, and the interconnected conductive plug 2112 and conductive plug box 2212 have opposite electrodes, so as to realize circuit series connection after the plug connection. The conductive plug 2112 can be vertically inserted into the conductive socket 2212 from top to bottom to achieve conduction, so that the connection can be realized synchronously after the card board and the card slot are plugged and connected.

The card slot may include sliding slots 2214 on both sides and a limiting slot 2215 on the bottom, that is, the card slot forms a U-shaped structure as a whole (refer to FIG. 4 ). Both sides of the clamping board are respectively provided with first insertion parts corresponding to the sliding slots 2214 , and the bottom of the clamping board is provided with a second insertion part corresponding to the limiting groove 2215 . When the card board is inserted into the card slot, the card board is inserted into the card slot from top to bottom through the opening of the U-shaped structure of the card slot. 2215 acts as a limit position in the downward direction, and prevents further movement after being snapped into place, ensuring the accuracy of the connection positions of different microbial fuel cells. In addition, it can be positioned quickly and is easy to install and disassemble. It is also a conductive plug 2112 and a conductive The alignment of the insert box 2212 provides convenience. After the card board and the card slot are plugged and connected, a semi-enclosed structure can be formed on the bottom and both sides, and the first hole 2113 and the second hole 2213 are connected in the semi-enclosed structure to ensure the tightness of the connection and realize the smooth flow of water according to the microorganisms. The flow of fuel cells in series sequence ensures the treatment effect of the wetland system.

A plurality of rollers 2111 are sequentially arranged along the insertion direction of the first socket part, and the rolling direction of the rollers 2111 is consistent with the socket connection direction of the first socket part, and a slideway 2211 is provided on one side of the chute 2214 corresponding to the rollers 2111, The roller 2111 can roll in the slideway 2211, which can further constrain the relative position of the card board and the card slot. At the same time, by setting the roller 2111, the ease of insertion and extraction process can be improved, and the positioning of the card board and the card slot can be assembled and disassembled accurately. , fast, labor-saving, and adopts the vertical loading and unloading connection method, which further improves the convenience of the installation and disassembly of the card board and the card slot.

As shown in Figures 6-7, the other side of the chute 2214 and the other side of the limiting groove 2215 are provided with a rubber pad 2216, after the roller 2111 enters the slideway 2211, the back of the first insertion part can be attached to the rubber pad 2216, a relatively closed semi-enclosed communication space is formed to further improve the sealing of the communication between adjacent microbial fuel cells.

As shown in Figure 8, the third connecting part 231 may include a fixing ring 2312, guide rods 11 are provided at the water inlet channel 1 and the water outlet channel 3, when installing the C-shaped module 23, insert it from top to bottom, at this time, fix The downward movement of the ring 2312 can be inserted into the guide rod 11 , that is, through the cooperation of the guide rod 11 and the fixing ring 2312 , the smooth positioning and installation of the C-shaped module 23 can be realized.

As shown in FIGS. 5 and 8 , the third connecting portion 231 includes a socket hole 2311 with the opening facing down that communicates with the microbial fuel cell. The water hole is the water hole. Both the water inlet channel 1 and the water outlet channel 3 are connected with a vertically upward water pipe 12, and the socket hole 2311 is inserted downward into the water pipe 12 to realize communication. After the water pipe 12 is inserted, the sealing of the pipe wall is realized. The water pipe 12 is provided with an on-off valve. When the C-type module 23 needs to be dismantled, the on-off valve can be closed earlier, and the C-type module 23 is taken out for replacement or flushing, and then the on-off valve is opened after reinstallation. Since the processing units 2 are arranged in parallel and the processing units 2 operate relatively independently, when taking out the blocked microbial fuel cell for replacement/rinsing, it is only necessary to close the switch valve of the corresponding processing unit 2 without shutting off the water in the whole system, so it is not necessary It affects the normal operation of other processing units 2, and realizes the effect that the replacement of packing does not stop the operation of the system.

As shown in Figure 2, the microbial fuel cell includes a packing bed and wetland plants 10, and the packing bed includes a support layer 9, a middle matrix layer 8, and an upper matrix layer 7 arranged from bottom to top, and the bottom of the middle matrix layer 8 is provided with an anode Material 6, the top of the upper matrix layer 7 is laid with a cathode material 5, the cathode material 5 and the anode material 6 are respectively connected to different electrode leads (which can be a conductive plug 2112 or a conductive plug box 2212), in the upper matrix layer 7 Wetland plants 10 are planted.

As a modular wetland tank, the microbial fuel cell can be designed as 1.5m x 0.8m x 1.0m in length x width x height, and the material is made of ABS or polyvinyl chloride with a certain tensile strength. The supporting layer 9 is 20cm thick, and the matrix is made of gravel and gravel with a particle size of φ16-30mm; the middle matrix layer 8 is 35cm thick, and the matrix is made of gravel and zeolite with a particle size of φ4-15mm; the upper matrix layer 7 is 15cm thick, Materials such as coarse sand or soil with a small particle size are selected as the substrate; reeds, calamus, canna, etc. are selected as the wetland plants 10 . A conductive material such as an activated carbon layer or a graphite blanket can be laid on the top of the upper matrix layer 7 as the cathode material 5, and a conductive material such as an activated carbon layer or a graphite blanket can be laid on the bottom of the middle matrix layer 8 as the anode material 6.

Each microbial fuel cell forms a modular wetland. When wastewater flows through the wetland, physical effects such as interception, filtration, and adsorption in the substrate layer, biodegradation of the microbial population attached to the surface of the substrate and root system, and absorption of wetland plants 10, Purified under the effect of rhizosphere effect. The wet subterranean anaerobic zone constitutes the anode chamber of the microbial fuel cell, and the electrogenic bacteria attached to the anode material 6 oxidize and degrade the organic matter in the waste water to generate electrons and protons, and the electrons are connected to the cathode material 5 of another module through the anode material 6 and external wires, The protons flow up to the cathode material 5 with the wastewater. The upper layer of the wetland forms an aerobic zone under the action of air reoxygenation and plant root oxygen secretion to form the cathode chamber of the microbial fuel cell, and the protons undergo an electrode reaction with the participation of oxygen to become water. The above process not only realizes the purification of sewage, but also forms a microbial fuel cell. Through the modularized device of the present invention, on the one hand, the oxidation-reduction potential difference between the cathode and anode chambers forms a voltage to realize electric energy output. On the other hand, the accelerated circulation of electrons in the microbial fuel cell is helpful to the supply of organic matter electrons, which enhances the degradation capacity and rate of organic matter in the wetland system.

To sum up, the present invention, through the organic combination of modularization and microbial fuel cells, mutually strengthens the abilities of anti-clogging, pollutant degradation, and electric energy output, so that the abilities of all aspects are significantly improved compared with those without the combination.

In the present invention, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; meanwhile, for those of ordinary skill in the art, according to the present invention The idea of the invention will have changes in the specific implementation and scope of application. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. A modular microbial fuel cell type constructed wetland system, which is characterized in that: including the inlet canal, wetland treatment district and the water outlet canal of connecting in order, the wetland treatment district is including a plurality of processing units of parallelly connected setting, processing unit's water inlet is connected the inlet canal, processing unit's delivery port is connected the water outlet canal, every processing unit includes a plurality of microbiological fuel cells of series connection, microbiological fuel cell's both ends are provided with water inlet and delivery port respectively to be provided with the electrode extraction end opposite in polarity respectively at water inlet side and delivery port side, adjacent microbiological fuel cell's water inlet and delivery port can dismantle the connection, and adjacent microbiological fuel cell's electrode extraction end opposite in polarity can dismantle the connection.

2. The modular microbial fuel cell constructed wetland system according to claim 1, wherein: the microbial fuel cell is divided into an A-type module, a B-type module and a C-type module according to the difference of the connecting parts, wherein the two ends of the A-type module are respectively provided with a first connecting part, the two ends of the B-type module are respectively provided with a second connecting part, the two ends of the C-type module are respectively provided with a first connecting part and a third connecting part, the first connecting part is connected with the second connecting part, and the third connecting part is connected with the water inlet channel or the water outlet channel.

3. The modular microbial fuel cell constructed wetland system according to claim 2, wherein: the first connecting portion comprises a clamping plate, first holes distributed on the clamping plate and a conductive plug arranged in the middle of the clamping plate, the second connecting portion comprises a clamping groove matched with the clamping plate, second holes distributed on the clamping groove and a conductive plug box arranged in the middle of the clamping groove, the conductive plug and the conductive plug box are respectively connected with different electrodes, and the conductive plug box can be connected after the clamping plate is connected with the clamping groove in a plugging mode.

4. A modular microbial fuel cell constructed wetland system according to claim 3, wherein: the clamping groove comprises sliding grooves on two sides and a limiting groove on the bottom, the two sides of the clamping plate are respectively provided with a first inserting part corresponding to the sliding grooves, and the bottom of the clamping plate is provided with a second inserting part corresponding to the limiting groove.

5. The modular microbial fuel cell constructed wetland system according to claim 4, wherein: the first inserting portion is provided with a plurality of rollers in sequence along the inserting direction, and a slide way is arranged at a position corresponding to one surface of the sliding groove and the rollers.

6. The modular microbial fuel cell constructed wetland system according to claim 5, wherein: the other face of the chute and the other face of the limiting groove are both provided with rubber pads, and the back face of the first inserting part is attached to the rubber pads after the rollers enter the chute.

7. The modular microbial fuel cell constructed wetland system according to any one of claims 2 to 6, wherein: the third connecting part comprises a fixed ring, guide rods are arranged at the water inlet canal and the water outlet canal, and the fixed ring can be sleeved into the guide rods by downward movement.

8. The modular microbial fuel cell constructed wetland system according to claim 7, wherein: the third connecting portion comprises a socket hole with a downward opening communicated with the interior of the microbial fuel cell, the water inlet channel and the water outlet channel are both connected with a vertical upward water pipe, a switch valve is arranged on the water pipe, and the socket hole is sleeved into the water pipe downwards to realize communication.

9. The modular microbial fuel cell constructed wetland system according to claim 1, wherein: the microbial fuel cell comprises a packed bed and wetland plants, wherein the packed bed comprises a supporting layer, a middle substrate layer and an upper substrate layer which are arranged from bottom to top, anode materials are laid at the bottom of the middle substrate layer, cathode materials are laid at the top of the upper substrate layer, the cathode materials and the anode materials are respectively connected with different electrode leading-out ends, and the wetland plants are planted in the upper substrate layer.

10. The modular microbial fuel cell constructed wetland system according to claim 9, wherein: the thickness of the bearing layer is 20cm, and the substrate is gravel with the particle diameter phi of 16-30 mm; the thickness of the middle layer matrix layer is 35cm, and the matrix adopts gravel and zeolite with the particle diameter phi of 4-15 mm; the thickness of the upper substrate layer is 15cm, and coarse sand or soil with smaller particle size is selected as the substrate; the wetland plants are reed, calamus and canna; the cathode material and the anode material adopt an active carbon layer or a graphite blanket.

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