CN111592115A - Microbial fuel cell-constructed wetland coupling system - Google Patents

Microbial fuel cell-constructed wetland coupling system Download PDF

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Publication number
CN111592115A
CN111592115A CN202010569317.2A CN202010569317A CN111592115A CN 111592115 A CN111592115 A CN 111592115A CN 202010569317 A CN202010569317 A CN 202010569317A CN 111592115 A CN111592115 A CN 111592115A
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fuel cell
microbial fuel
cathode
artificial wetland
lead
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Inventor
蒋岩
彭犇
田玮
吴晓辉
李国宏
朱法强
董悦
严俊
马姣
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Central Research Institute of Building and Construction Co Ltd MCC Group
MCC Energy Saving and Environmental Protection Co Ltd
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Central Research Institute of Building and Construction Co Ltd MCC Group
MCC Energy Saving and Environmental Protection Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Biochemistry (AREA)
  • Sustainable Energy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biotechnology (AREA)
  • Botany (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

The invention provides a microbial fuel cell-artificial wetland coupling system, which consists of an artificial wetland unit, a microbial fuel cell unit, a water supply unit and an oxygen supplementing unit; the system water inlet is artificial sewage, the sewage flows in from a water inlet at the bottom of the system through a peristaltic pump, and flows out from a water outlet at the top of the system after passing through the matrix filler, the electrodes and the aquatic plants; the cathode and the anode of the microbial fuel cell are respectively composed of four electrode cages with the same size, the design of the electrode cages improves the contact area of the microbial fuel cell and pollutants, simultaneously avoids the influence on the growth of plant roots, and the application of the oxygen supplementing unit can effectively improve the removal capacity of the constructed wetland on the pollutants such as organic matters, nitrogen, phosphorus and the like on the basis of not increasing the occupied area and can simultaneously produce electric energy. The invention realizes the tight combination of pollution control and capacity, has simple structure, low operation cost and good removal effect, and has good development prospect in the field of domestic sewage treatment.

Description

Microbial fuel cell-constructed wetland coupling system
Technical Field
The invention relates to the field of sewage treatment, in particular to a microbial fuel cell-artificial wetland coupling system for treating domestic sewage.
Background
With the improvement of the living standard of residents in China, the problem of domestic sewage pollution is increasingly serious. At present, domestic sewage is treated by methods such as an activated sludge method and a biofilm method, but the problems of high energy consumption, high operation cost and the like generally exist, and professional managers are required to perform maintenance and management. Therefore, the method for treating water with energy saving and high efficiency is of great significance. In recent years, the artificial wetland technology has been widely applied to treatment and purification of domestic sewage due to simple maintenance operation and low investment and maintenance cost, but the artificial wetland technology has poor effect of removing pollutants such as nitrogen, phosphorus and the like. The microbial fuel cell technology is a novel sewage treatment technology taking microbes as a catalyst, can achieve the purpose of water body purification through the transmission of electrons and protons, and can also generate a small amount of electric energy.
Therefore, the invention combines the microbial fuel cell technology and the artificial wetland technology, improves the electrode in the microbial fuel cell and adds the energy-consumption-free oxygen supplement unit, improves the removal capacity of the traditional artificial wetland to pollutants in domestic sewage and the electricity generation efficiency of the microbial fuel cell on the basis of not increasing the occupied area, and synchronously realizes the purification of wastewater and the recovery of energy.
Disclosure of Invention
The invention provides a microbial fuel cell-artificial wetland coupling system (a coupling system of a microbial fuel cell and an artificial wetland), which can effectively improve the removal capacity of the traditional artificial wetland to pollutants in domestic sewage.
In order to solve the technical problem, the invention provides a microbial fuel cell-artificial wetland coupling system, which comprises an artificial wetland unit, a microbial fuel cell unit, a water supply unit and an oxygen supplement unit; the artificial wetland unit comprises a column body (5), a gravel layer (6), a ceramic particle layer (7), an active carbon layer (8), a quartz sand layer (9) and aquatic plants (15); a gravel layer (6), a ceramic particle layer (7), an active carbon layer (8) and a quartz sand layer (9) are sequentially filled in the column body (5) from bottom to top; the microbial fuel cell unit comprises an anode (11), a cathode (12), an anode lead (16), a cathode lead (17) and an external resistor (18); the anode (11) and the cathode (12) are both arranged in the activated carbon layer (8), the anode (11) is positioned below the activated carbon layer (8), and the cathode (12) is positioned above the activated carbon layer (8); the anode (11) is connected with an anode lead (16), and the cathode (12) is connected with a cathode lead (17); the anode lead (16) is connected with one end of an external resistor (18), and the cathode lead (17) is connected with the other end of the external resistor (18); the external resistor (18) is positioned outside the column body (5); the root system of the aquatic plant (15) is close to the cathode (12); the water supply unit is connected with the column body (5) and is used for supplying sewage into the column body (5); the oxygen supplementing unit comprises a plurality of oxygen supplementing pipes (14), and the bottoms of the oxygen supplementing pipes (14) are in contact with the cathode (12).
Wherein, the artificial wetland unit also comprises a base (4); the column body (5) is an acrylic column body and is placed on the base (4); the aquatic plant is one or more of canna, Thalia japonica and Sapindus indica.
Wherein, the water supply unit comprises a water supply tank (1) and a peristaltic pump (2); a system water inlet is formed in the bottom of the column body (5), and the water supply tank (1) is connected with the system water inlet through a peristaltic pump (2); a system water outlet is arranged on the cylinder (5) above the quartz sand layer (9).
The water supply tank (1) is a horizontal water tank, a water outlet valve is arranged on the side face of the horizontal water tank and connected with the peristaltic pump (2) through a rubber tube, the peristaltic pump (2) is connected with a water inlet of the system through a rubber tube, and the peristaltic pump (2) can control and adjust the water inlet amount of the system.
The microbial fuel cell unit also comprises a lead chamber (10), wherein the lead chamber (10) is a hollow acrylic column with a sealed bottom and is fixed on the side surface of the column body (5).
Wherein, the wire chamber (10) is provided with a waterproof wire hole; the anode lead (16) and the cathode lead (17) penetrate into the lead chamber (10) from a waterproof lead hole on the side surface of the lead chamber (10), penetrate out from the upper part of the lead chamber (10), and are connected with each other outside the system through an external resistor (18).
Wherein, a plurality of apertures are arranged at the lower side of the oxygen supply pipe (14), and a plurality of oxygen supply pipes are uniformly distributed in the column body (5).
Wherein the height of the gravel layer (6) is 10-20cm, preferably 15cm, and the particle size of the gravel is 5-8 mm; the height of the ceramsite layer (7) is 10-20cm, preferably 15cm, and the particle size of the ceramsite is about 3-5 mm; the height of the activated carbon layer (8) is 20-30cm, preferably 25cm, and the particle size of the activated carbon is about 3-5 mm; the height of the quartz sand layer (9) is 2-7cm, preferably 5cm, and the particle size of the quartz sand is about 3-5 mm.
Wherein the anode (11) and the cathode (12) are both composed of four electrode cages (19) with equal size; each electrode cage is woven by a red copper net.
Wherein, each electrode cage is filled with columnar activated carbon or carbon felt, the length of the columnar activated carbon is about 5-8mm, and the diameter is about 3 mm; the carbon felt is a small cube with the side length of 5 mm; each electrode cage adopts distributed arrangement and is connected by a plurality of copper leads (20), and the copper leads (20) are wrapped by anticorrosive materials
Preferably, the technical scheme adopted for achieving the above purpose of the invention is as follows:
a microbial fuel cell-artificial wetland coupling system at least comprises an artificial wetland unit, a microbial fuel cell unit, a water supply unit and an oxygen supplement unit. The artificial wetland unit consists of a base, an acrylic column, a gravel layer, a ceramic particle layer, an activated carbon layer, a quartz sand layer and aquatic plants. The base adopts the PVC material, and oval hole is left so that the transport in both sides, and the inside baffle that adopts cross structure of base is used for consolidating. The acrylic column is placed on the base, the bottom of the acrylic column is adhered with a circular acrylic plate by chloroform, and the gap is subjected to waterproof treatment by glass cement. A threaded small hole is drilled at the bottom of the acrylic column, and a No. 1 copper precious tower head is installed on the small hole. A gravel layer, a ceramic particle layer, an activated carbon layer and a quartz sand layer are sequentially filled in the acrylic column, wherein the particle size of the gravel is 5-8mm, so that the flow velocity of water flow in the system is stabilized, and suspended matters in water are removed; the grain size of the ceramsite is about 3-5mm, so that pollutants in a water body can be effectively adsorbed, and the sewage is primarily filtered; the particle size of the activated carbon is about 3-5mm, so that on one hand, pollutants in a water body can be adsorbed again, on the other hand, a good environment is created for the growth and the propagation of denitrifying bacteria, and meanwhile, the capture capacity of the microbial fuel cell unit on electrons is improved; the grain size of the quartz sand is about 3-5mm, and a good environment is provided for the growth of plants. A small hole with threads is drilled on the side wall above the quartz sand layer, and a No. 2 copper precious tower head is installed on the small hole to finish system water outlet. The aquatic plant is selected from one or more of canna, thaliana, and pinus sylvestris, and the root system of the plant should be close to the cathode as much as possible in the planting process.
The microbial fuel cell unit consists of a lead chamber, an anode, a cathode, an anode lead, a cathode lead and an external resistor. The wire chamber is a hollow acrylic column with a sealed bottom, is fixed on the side surface of the acrylic column body, can contain 4 wires in diameter, and is provided with a waterproof wire hole. The anode and the cathode are respectively composed of four electrode cages with equal size. Each electrode cage is woven by adopting a red copper net, and is filled with columnar activated carbon or carbon felt, wherein the length of the columnar activated carbon is about 5-8mm, and the diameter of the columnar activated carbon is about 3 mm; the carbon felt is a small cube with an edge length of about 5 mm. Each electrode cage adopts distributed arrangement and is connected by a plurality of copper wires, and the copper wires are wrapped by anticorrosive materials. The prepared anode and the cathode are both arranged in the activated carbon layer, the anode is positioned below the activated carbon layer, and the cathode is positioned above the activated carbon layer. The anode and the cathode are both connected with leads. The anode lead and the cathode lead penetrate into the lead chamber from the waterproof lead hole on the side surface of the lead chamber, penetrate out from the upper part of the lead chamber and are connected with each other outside the system after passing through an external resistor, and the external resistor is about 50 omega.
The water supply unit consists of a water supply tank and a peristaltic pump, the water supply tank is a horizontal water tank with the capacity of about 250L, a water outlet valve is arranged on the side surface of the water tank, the valve is connected with the peristaltic pump through a rubber tube and then connected with a No. 1 copper pagoda head, and the peristaltic pump can control the water inlet amount of the regulating system.
The oxygen supplementing unit consists of a plurality of oxygen supplementing pipes made of PVC materials, and a plurality of small holes are drilled at the lower sides of the oxygen supplementing pipes. In the embedding process, the oxygen supplementing pipes are uniformly distributed in the acrylic column, and the bottom of each oxygen supplementing pipe needs to be in contact with the cathode.
The invention provides a microbial fuel cell-artificial wetland coupling system which comprises an artificial wetland unit, a microbial fuel cell unit, a water supply unit and an oxygen supplementing unit. The system water inlet is artificial sewage prepared by referring to the pollution components of the domestic sewage, the sewage flows in from a water inlet at the bottom of the system through a peristaltic pump, and flows out from a water outlet at the top of the system after passing through the matrix filler, the electrodes and the aquatic plants. The cathode and the anode of the microbial fuel cell are respectively composed of four electrode cages with the same size and filled with columnar activated carbon or carbon felt, the design of the electrode cages improves the contact area of the microbial fuel cell and pollutants, simultaneously avoids the influence on the growth of plant roots, and by the application of an oxygen supplementing unit, the removal capacity of the constructed wetland on pollutants such as organic matters, nitrogen, phosphorus and the like can be effectively improved on the basis of not increasing the floor area, and meanwhile, the electric energy can be produced. The invention realizes the tight combination of pollution control and capacity, has simple structure, low operation cost and good removal effect, and has good development prospect in the field of domestic sewage treatment.
Compared with the prior art, the microbial fuel cell-artificial wetland coupling system provided by the invention has the following advantages: 1. the combination of the microbial fuel cell technology and the artificial wetland technology can improve the removal capacity of the traditional artificial wetland for pollutants in rural domestic sewage on the basis of not increasing the floor area, and can generate electric energy to synchronously realize wastewater purification and energy recovery. 2. The cathode and the anode are constructed in a form that an electrode cage is filled with carbon felt or activated carbon, and are positioned on an activated carbon layer with a large specific surface area, so that the growth of microorganisms is facilitated; and the electrode cages in the cathode and the anode are distributed, so that the contact area of the electrodes and a water body is increased, the influence of the cathode on the growth of plant roots is avoided, the concentration of dissolved oxygen around the cathode is ensured, and the removal efficiency of the system on pollutants is improved. 3. The bottom of the system is selected from gravels with larger grain diameters, so that the problem of blockage in the long-term operation process of the system can be avoided. 4. The embedding of the oxygen supply pipe can further improve the concentration of dissolved oxygen near the cathode and improve the water quality of the water body. 5. The invention is suitable for the treatment of domestic sewage, has simple system construction, economy, high efficiency and convenient management, and has good popularization prospect.
Drawings
Fig. 1 is an overall structure diagram of a microbial fuel cell-artificial wetland coupling system provided by the invention.
FIG. 2 is a schematic view of the overall structure of the cathode and anode.
Description of reference numerals: 1-water supply tank, 2-peristaltic pump, 3-1 copper pagoda head, 4-base, 5-acrylic column, 6-gravel layer, 7-ceramic layer, 8-activated carbon layer, 9-quartz sand layer, 10-lead chamber, 11-anode, 12-cathode, 13-2 copper pagoda head, 14-oxygen supplement pipe, 15-aquatic plant, 16-anode lead, 17-cathode lead, 18-external resistance, 19-electrode cage, 20-copper lead
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and specific embodiments.
The microbial fuel cell-artificial wetland coupling system provided in the embodiment is shown in fig. 1, and comprises an artificial wetland unit, a microbial fuel cell unit, a water supply unit and an oxygen supplement unit; the constructed wetland unit comprises: the cylinder 5 is preferably an acrylic main body, a gravel layer 6, a ceramsite layer 7, an activated carbon layer 8, a quartz sand layer 9 and aquatic plants 15; a gravel layer 6, a ceramsite layer 7, an activated carbon layer 8 and a quartz sand layer 9 are sequentially filled in the column body 5 from bottom to top; the microbial fuel cell unit comprises an anode 11, a cathode 12, an anode lead 16, a cathode lead 17 and an external resistor 18; the anode 11 and the cathode 12 are both arranged in the activated carbon layer 8, the anode 11 is positioned below the activated carbon layer 8, and the cathode 12 is positioned above the activated carbon layer 8; the anode 11 is connected with an anode lead 16, and the cathode 12 is connected with a cathode lead 17; the anode lead 16 is connected with one end of an external resistor 18, and the cathode lead 17 is connected with the other end of the external resistor 18; the external resistor 18 is positioned outside the column 5; the root system of the aquatic plant 15 is close to the cathode 12; the water supply unit is connected with the column 5 and is used for supplying sewage into the column 5; the oxygen supplementing unit comprises a plurality of oxygen supplementing pipes 14, and the bottoms of the oxygen supplementing pipes 14 are in contact with the cathode 12.
The bottom surface of the acrylic column 5 is adhered with an acrylic circular plate and is subjected to waterproof treatment. The acrylic cylinder 5 after completion is placed on the PVC base 4, and the partition plate with a cross structure is adopted in the base for reinforcement. A threaded small hole is drilled above the bottom plate of the acrylic column 5, a No. 1 copper baby tower head 3 (forming a system water inlet) is installed on the small hole, and the baby tower head is connected with the peristaltic pump 2 through a rubber tube and then connected with the water supply tank 1 to provide artificial sewage for the system. The bottom of the acrylic column 5 is firstly filled with a gravel layer 6, and the particle size of the gravel layer is about 5-8 mm. The gravel layer 6 is filled with a ceramic layer 7 having a particle size of about 3 to 5 mm. After the ceramic particle layer 7 is filled, a wire chamber 10 is arranged on the side wall of the acryl column 5, the wire chamber 10 is a hollow acryl column with a sealed bottom, the diameter of the hollow acryl column can accommodate 4 wires, and a waterproof wire hole is reserved on the side wall. After the installation, the ceramsite layer 7 is filled with an activated carbon layer 8 with the grain diameter of about 3-5 mm. An anode 11 is arranged below the activated carbon layer 8 and is connected with an anode lead 16; the cathode 12 is installed on the activated carbon layer 8 and connected to the cathode lead 18. The anode lead 16 and the cathode lead 17 both penetrate through the waterproof lead hole on the side wall of the lead chamber 10, penetrate out from the upper part of the lead chamber 10, and are connected after passing through the external resistor 18, and the external resistor 18 is about 50 omega. The activated carbon layer 8 is filled with a quartz sand layer 9, the grain diameter of the activated carbon layer is about 3-5mm, a plurality of PVC oxygen supply pipes 14 are buried deeply, a plurality of small holes are drilled at the lower sides of the oxygen supply pipes 14, and the bottoms of the small holes are in contact with the cathode 12. A small hole with threads is drilled above the quartz sand layer, and a No. 2 copper precious tower head 13 is installed on the small hole and is used as a system water outlet. After the system is constructed, the peristaltic pump 2 is started to carry out a water inlet test, the aquatic plant 15 is planted after the system is normal in water outlet, the aquatic plant 15 selects and uses Thalia dealbata, rush, canna and the like, and the root system of the aquatic plant 15 is in contact with the cathode 12 in the planting process.
The structure of the anode 11 and the cathode 12 is shown in fig. 2.
The anode 11 and the cathode 12 are composed of four electrode cages 19 with equal size. Each electrode cage 19 is woven from a copper mesh. After the electrode cages 19 are woven, columnar activated carbon or carbon felt is filled in the electrode cages, wherein the length of the columnar activated carbon is about 5-8mm, and the diameter of the columnar activated carbon is about 3mm(ii) a The carbon felt has an edge length of about 5mmA small cube of (2). Each electrode cage adopts distributed arrangement and is connected by a plurality of copper wires 20, and the copper wires 20 are wrapped by anticorrosive materials.
The application example of the microbial fuel cell-artificial wetland coupling system comprises the following steps:
1) construction of the System
4 sets of microbial fuel cell-artificial wetland coupling systems are constructed according to the method, and the two sets are experimental groups and respectively take columnar activated carbon and carbon felt as filling materials of an electrode cage; the two sets are used as a control group, and the columnar activated carbon and the carbon felt are respectively used as filling materials of an electrode cage, but the cathode lead and the anode lead are not connected.
2) Startup of system
The artificial sewage is prepared by referring to pollutant components in domestic sewage, and the composition of the artificial sewage is shown in table 1. After the artificial sewage is configured, a peristaltic pump is started to supply water to the system in a continuous water inlet mode, and the hydraulic retention time of the system is 1 day. After the system normally discharges water, the quality of the discharged water and the output voltage of an external circuit are periodically detected, and when the quality of the discharged water is stable and the output voltage is stable over 200mv, the starting of the microbial fuel cell-artificial wetland coupling system is finished.
TABLE 1 composition of artificial wastewater
Figure BDA0002548880460000051
3) System performance analysis
Compared with a control group, the removal capacity of the constructed experimental group of the microbial fuel cell-artificial wetland coupled system is obviously improved, wherein the effluent quality and the electricity generation performance of the microbial fuel cell-artificial wetland coupled system taking the carbon felt as the electrode material are optimal. The concentration of each pollutant in the effluent water body can reach the first class A standard of pollutant discharge standard of urban sewage treatment plants, and the output voltage can be stabilized at 300 mv.
The above embodiments are not limited to the above embodiments, and other combinations of related devices are also within the scope of the present invention, and the above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims (10)

1. A microbial fuel cell-artificial wetland coupling system, characterized in that the coupling system comprises: the artificial wetland system comprises an artificial wetland unit, a microbial fuel cell unit, a water supply unit and an oxygen supplement unit; the artificial wetland unit comprises a column body (5), a gravel layer (6), a ceramic particle layer (7), an active carbon layer (8), a quartz sand layer (9) and aquatic plants (15); a gravel layer (6), a ceramic particle layer (7), an active carbon layer (8) and a quartz sand layer (9) are sequentially filled in the column body (5) from bottom to top; the microbial fuel cell unit comprises an anode (11), a cathode (12), an anode lead (16), a cathode lead (17) and an external resistor (18); the anode (11) and the cathode (12) are both arranged in the activated carbon layer (8), the anode (11) is positioned below the activated carbon layer (8), and the cathode (12) is positioned above the activated carbon layer (8); the anode (11) is connected with an anode lead (16), and the cathode (12) is connected with a cathode lead (17); the anode lead (16) is connected with one end of an external resistor (18), and the cathode lead (17) is connected with the other end of the external resistor (18); the external resistor (18) is positioned outside the column body (5); the root system of the aquatic plant (15) is close to the cathode (12); the water supply unit is connected with the column body (5) and is used for supplying sewage into the column body (5); the oxygen supplementing unit comprises an oxygen supplementing pipe (14), and the bottom of the oxygen supplementing pipe (14) is in contact with the cathode (12).
2. The microbial fuel cell-artificial wetland coupling system of claim 1, wherein the artificial wetland unit further comprises a base (4); the column body (5) is an acrylic column body and is placed on the base (4); the aquatic plant is one or more of canna, Thalia japonica and Sapindus indica.
3. A microbial fuel cell-artificial wetland coupling system according to any one of claims 1 to 2, wherein the water supply unit comprises a water supply tank (1) and a peristaltic pump (2); a system water inlet is formed in the bottom of the column body (5), and the water supply tank (1) is connected with the system water inlet through a peristaltic pump (2); a system water outlet is arranged on the cylinder (5) above the quartz sand layer (9).
4. The microbial fuel cell-artificial wetland coupling system of claim 3, wherein the water supply tank (1) is a horizontal water tank, a water outlet valve is arranged on the side surface of the horizontal water tank, the water outlet valve is connected with the peristaltic pump (2) through a rubber tube, the peristaltic pump (2) is connected with a water inlet of the system through a rubber tube, and the peristaltic pump (2) can control and adjust the water inlet amount of the system.
5. The microbial fuel cell-artificial wetland coupling system of any one of claims 1 to 4, wherein the microbial fuel cell unit further comprises a lead chamber (10), and the lead chamber (10) is a hollow acrylic column with a sealed bottom and is fixed on the side surface of the column body (5).
6. The microbial fuel cell-artificial wetland coupling system of claim 5, wherein the lead chamber (10) is provided with a waterproof lead hole; the anode lead (16) and the cathode lead (17) penetrate into the lead chamber (10) from a waterproof lead hole on the side surface of the lead chamber (10), penetrate out from the upper part of the lead chamber (10), and are connected with each other outside the system through an external resistor (18).
7. The microbial fuel cell-artificial wetland coupling system of any one of claims 1 to 6, wherein the oxygen supply pipe (14) is provided with a plurality of small holes at the lower side, and the plurality of oxygen supply pipes are uniformly distributed in the column body (5).
8. The microbial fuel cell-artificial wetland coupling system according to any one of claims 1 to 7, wherein the height of the gravel layer (6) is 10-20cm, preferably 15cm, and the diameter of the gravel is 5-8 mm; the height of the ceramsite layer (7) is 10-20cm, preferably 15cm, and the particle size of the ceramsite is about 3-5 mm; the height of the activated carbon layer (8) is 20-30cm, preferably 25cm, and the particle size of the activated carbon is about 3-5 mm; the height of the quartz sand layer (9) is 2-7cm, preferably 5cm, and the particle size of the quartz sand is about 3-5 mm.
9. A microbial fuel cell-artificial wetland coupling system according to any one of claims 1 to 8, wherein the anode (11) and the cathode (12) are each composed of four equal-sized electrode cages (19); each electrode cage is woven by a red copper net.
10. The microbial fuel cell-artificial wetland coupling system of claim 9, wherein each electrode cage is filled with columnar activated carbon or carbon felt, the length of the columnar activated carbon is about 5-8mm, and the diameter of the columnar activated carbon is about 3 mm; the carbon felt is a small cube with the side length of 5 mm; each electrode cage is distributed and connected by a plurality of copper wires (20), and the copper wires (20) are wrapped by anticorrosive materials.
CN202010569317.2A 2020-06-20 2020-06-20 Microbial fuel cell-constructed wetland coupling system Pending CN111592115A (en)

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CN113979532A (en) * 2021-10-28 2022-01-28 山东大学 Primary cell type constructed wetland system with phosphorus recovery function
CN115108628A (en) * 2022-07-07 2022-09-27 中国科学院东北地理与农业生态研究所 System and method for realizing emission reduction of greenhouse gas and ammonia gas in sewage treatment process

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CN112939196A (en) * 2021-02-05 2021-06-11 郑州轻工业大学 Coke electrode microbial fuel cell constructed wetland system, operation method and application
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