Remediation device based on microbial electrolysis-ecological floating bed

Abstract

The utility model discloses a repair device based on microorganism electrolysis-ecological floating bed. Including walking mechanism, ecological floating bed, underwater microorganism electrolysis module and microorganism aeration membrane hanging device, ecological floating bed plants the developed emergent plant of root system, and the bottom of floating bed is provided with microorganism electrolysis module and microorganism aeration membrane hanging device, and microorganism electrolysis module removes pollutant through microorganism electrolysis denitrification, adopts series-parallel electrode connection mode, increases microorganism growth point position, improves electron delivery capacity, the utility model discloses microorganism electrolysis-ecological floating bed technology synergic coupling, improves the degradation and repair efficiency of pollutant, promotes the comprehensive purification capacity of floating bed, realizes water purification and ecological restoration, has the advantages of reasonable in design, simple structure, convenient operation, repair efficient, beautification ecology.

Description

Technical Field

[0001] This utility model relates to the field of ecological restoration technology for rivers and lakes, and more specifically, to a restoration device and method based on microbial electrolysis-ecological floating bed. Background Technology

[0002] Rivers are vital hydrological ecosystems, serving functions such as flood control and drainage, climate regulation, ecological balance, and landscape recreation. With urban development and population growth, pollutant emissions have increased dramatically, entering surface water bodies through wastewater discharge and causing water pollution, resulting in rivers becoming black, foul-smelling, or eutrophic. The increasingly deteriorating aquatic ecological environment damages biodiversity, severely impacting the city's image, the lives and health of surrounding residents, and hindering economic development. Therefore, the ecological restoration of polluted river bodies has become a real and urgent ecological and environmental problem that needs to be addressed.

[0003] During non-rainy seasons, urban rivers experience significant spatial and temporal variations in pollution concentration due to poor water flow, large water areas, and low dissolved oxygen concentrations. This results in simple aquatic ecosystems with limited environmental capacity and poor self-purification capabilities. During rainy seasons, urban rivers also serve a drainage function. To improve the river's aquatic environment without compromising its drainage capacity, ecological restoration devices, such as floating beds and aeration devices, are often installed near the riverbanks. However, the effective area of ​​these devices is limited, and their purification effect on the central water bodies of the river is weak.

[0004] Sulfur autotrophic denitrification biological nitrogen removal utilizes microbial metabolism to reduce nitrate nitrogen (NO3-N) in wastewater to nitrogen gas (N2) using sulfur and its compounds as electron donors. Sulfur bacteria then use CO2 and HCO3- as electron donors. - and CO3 2- Inorganic carbon serves as the carbon source for growth, oxidizing elemental sulfur or sulfides into sulfates and reducing nitrate nitrogen to gaseous nitrogen. Nitrifying bacteria, under aerobic conditions, oxidize ammonia nitrogen to nitrate nitrogen through nitrification. Simultaneously, all microorganisms within the reaction system undergo denitrification and nitrification. Adding an external battery to the reaction system enhances electron transfer capacity and increases ammonia and nitrogen metabolism efficiency, thereby accelerating the removal of ammonia nitrogen and total nitrogen.

[0005] Ecological floating beds use polymer material floats as a carrier and aquatic plants as the main body. The plant roots grow underwater, forming a vast root system that absorbs pollutants from the water. Through the combined action of aquatic plants and aquatic microorganisms, pollutants are adsorbed, transferred, transformed, and degraded. However, traditional ecological floating beds have limited comprehensive purification capabilities. They can remove and remediate conventional pollutants in the upper water layer, but cannot effectively treat pollutants or emerging pollutants in the lower water layer. Furthermore, existing processes suffer from high energy consumption and low efficiency, resulting in poor pollutant remediation effects.

[0006] Chinese patent CN 120364861 A discloses a mobile ecological floating bed device and an ecological restoration method, which can significantly improve the degradation and remediation efficiency of pollutants in water bodies, achieving water purification and ecological restoration. However, further improvements are needed to enhance the efficiency of redox reactions and the removal efficiency of pollutants. Utility Model Content

[0007] To address the aforementioned shortcomings, the purpose of this invention is to provide a remediation device based on microbial electrolysis and ecological floating bed, which couples the two technologies of microbial electrolysis and ecological floating bed to improve electron transfer capacity. Under the synergistic effect of aquatic plants and microorganisms, it improves the efficiency of redox reactions, enhances the degradation and remediation efficiency of pollutants, and achieves water purification and ecological restoration.

[0008] To achieve the above objectives, the present invention provides a remediation device based on microbial electrolysis-ecological floating bed, the device comprising a walking mechanism, an ecological floating bed, an underwater microbial electrolysis module and / or a microbial aeration and biofilm attachment device;

[0009] The ecological floating bed is mounted on the walking mechanism;

[0010] The bottom of the ecological floating bed is equipped with an underwater microbial electrolysis module and / or a microbial aeration and biofilm attachment device, and aquatic plants are planted on the ecological floating bed.

[0011] The walking mechanism includes a lifting mechanism mounted on the base and a running device mounted on the lifting mechanism.

[0012] Furthermore, the ecological floating bed is divided into an emergent plant area (21) and a photovoltaic device area (22); the emergent plant area (21) is provided with a plant planting cavity (211), the planting cavity (211) is provided with a cathode electrode (212), the upper part of the cathode electrode (212) is in contact with the air, and the lower part passes through the planting cavity and is in contact with the water; the photovoltaic device area (22) is provided with a photovoltaic panel (221) and a controller (222), the photovoltaic panel is connected to a storage battery (223) through the controller, and the negative terminal of the storage battery (223) is connected to the upper part of the cathode electrode (212) through a wire;

[0013] The underwater microbial electrolysis module includes a suspended ball (31), an anode electrode (32), and a wire; the outer wall of the suspended ball (31) is hollowed out and the anode electrode (32) is embedded inside, and both ends of the electrode are connected to the wire; the suspended ball (31) and the anode electrode (32) are connected in series by the wire to form a suspended filler string, which is suspended on the bottom support frame of the ecological floating bed; the wire at the top of the suspended filler string is also connected to the positive terminal of the battery (223).

[0014] Furthermore, the cathode electrode (212) and the anode electrode (32) are graphite rods or porous carbon rods; the wire is one of titanium wire, stainless steel wire, or copper wire.

[0015] Furthermore, the microbial aeration and biofilm formation device includes an aeration module and a biofilm formation module; the aeration module includes a nanobubble generator (41), an air supply pipe (42), and a microporous aeration head (43); the nanobubble generator (41) is located on the upper part of the ecological floating bed, the air supply pipe (42) is located on the bottom of the ecological floating bed, the nanobubble generator (41) is connected to the air supply pipe (42), an electromagnetic valve is installed on the air supply pipe (42), and aeration holes are also provided on the air supply pipe (42). Microporous aeration heads (43) are installed at the corresponding aeration hole positions; the film-coating module includes carbon fiber aquatic plants (44), microbial agent delivery pipe (45) and microbial agent dosing device (46), the microbial agent dosing device (46) and the agent delivery pipe (45) are connected, the agent delivery pipe (45) is equipped with a solenoid valve, and the agent delivery pipe (45) is also equipped with a discharge hole; the carbon fiber aquatic plants (44) are suspended vertically downward on the agent delivery pipe (45).

[0016] Furthermore, it also includes water level detection devices, water quality detection devices, and control devices;

[0017] The control device controls the lifting mechanism to raise or lower the ecological floating bed based on the results of the water level detection device; or

[0018] The control device controls the operating device to move the ecological floating bed horizontally to the predetermined position based on the results of the water quality testing device.

[0019] Furthermore, the water quality detection device includes: a conductivity sensor, a turbidity sensor, a dissolved oxygen sensor, a microbial sensor, a COD sensor, an NH3-N sensor, a free radical sensor, a rate sensor, and a liquid level sensor.

[0020] Furthermore, the planting cavity is also filled with a soil layer, a zeolite layer, and an iron-carbon filler layer; the soil layer is 10-15 cm thick, the zeolite layer is 10-15 cm thick, and the iron-carbon mixture layer is 15-20 cm thick; emergent plants are planted in the planting cavity, and small holes with a diameter of 3-5 mm are evenly opened at the bottom of the planting cavity; this allows the roots of the aquatic plants to penetrate the bottom of the planting cavity and extend into the water; the iron-carbon filler layer is a mixture of sponge iron and activated carbon particles, with the sponge iron powder having a particle size of 2-3 mm and the activated carbon powder having a particle size of 1-3 mm; the sponge iron powder and activated carbon powder are uniformly mixed at a mass ratio of 1-2:2-3 to obtain a mixed powder, which is then prepared into particles with a particle size of 1-5 mm; the sponge iron and activated carbon form a galvanic cell, which oxidizes and flocculates heavy metals in the water through oxidation-reduction reactions, and removes them through adsorption by the roots of emergent plants.

[0021] Furthermore, the traveling mechanism includes a base, a hydraulic lifting mechanism, and a running device; the hydraulic lifting mechanism includes a bottom fixed seat for the hydraulic cylinder, a hydraulic cylinder body, and a top fixed seat; the running device includes a track, a connecting main beam, a connecting secondary beam, traveling wheels, and a drive motor; the base is provided with a connecting structure for connecting to the bottom fixed seat for the hydraulic cylinder; the top fixed seat is connected to the bottom of the track of the running device through a track connecting fastener, and the running device is driven to lift and lower by the hydraulic lifting mechanism; the running device is provided with an ecological floating bed, which is driven by the driving force provided by the drive motor to move along the track laying extension direction.

[0022] Furthermore, the main connecting beams of the operating device are arranged in groups, and each main connecting beam is equipped with a wheel mounting seat. Movable wheels are rotatably mounted inside each mounting seat, and wheel stabilizing seats are fixedly mounted on the inner side of each mounting seat. A drive reduction motor is fixedly mounted on one side of each stabilizing seat. The output end of each reduction motor passes through one end of the corresponding stabilizing seat and mounting seat, and is fixed to the other end of the corresponding wheel. Both ends of the main connecting beams are fixed to both ends of the secondary connecting beams to form the main frame. A support frame is provided inside the main frame, and an ecological floating bed is mounted on the support frame.

[0023] Furthermore, the photovoltaic device area is also equipped with a control cabinet, which consists of a PLC control module, a control panel, and a wireless remote controller for remotely controlling the automatic operation of the equipment. The PLC control module includes a data acquisition system, a PLC controller, and an execution module. The data acquisition system includes a conductivity sensor, a turbidity sensor, a dissolved oxygen sensor, a microbial sensor, a COD sensor, an NH3-N sensor, a free radical sensor, a rate sensor, a liquid level sensor, and an A / D converter. The water quality detection sensor is installed at the bottom of the ecological floating bed, and the water quality detection information is input to the PLC controller through the A / D converter.

[0024] The PLC controller is connected to the execution module, which includes a hydraulic lifting mechanism, a drive motor, a nanobubble generator, a microbial agent dosing device, and a solenoid valve; the execution module is powered by green driving electricity provided by a photovoltaic power generation system.

[0025] Furthermore, the aquatic plants are emergent plants with well-developed root systems and strong pollution tolerance, including one or more of reeds, cattails, irises, water onions, water celery, pickerelweed, loosestrife, and canna lilies, with native plants as the main component; to enhance the aesthetic appeal of the river landscape and restore the aquatic ecological environment.

[0026] To achieve the above objectives, this utility model provides a microbial electrolysis-ecological floating bed remediation method. The method is based on the aforementioned microbial electrolysis-ecological floating bed remediation device and includes the following steps:

[0027] First, the nanobubble generator (41), microbial agent dosing device (46) and solenoid valve on the pipeline are turned on by the PLC control module to replenish dissolved oxygen and microbial agents to the water body, promote the enrichment and attachment of dominant bacteria on carbon fiber aquatic plants (44), and enhance the accumulation of pollutants such as COD, nitrogen and phosphorus, and organic matter in the water body, thereby improving the ability of microorganisms and aquatic plants to absorb and degrade COD and nitrogen and phosphorus in a synergistic manner.

[0028] Secondly, the battery (223) switch is turned on, and electrons are supplied to the cathode electrode through the wire. The electrons enter the water and, together with the reduced sulfur in the sulfur autotrophic filler in the water suspension ball (31), serve as electron donors. Nitrate nitrogen and nitrite nitrogen serve as electron acceptors. Under the action of denitrifying bacteria, nitrate nitrogen is reduced to gaseous nitrogen, thus completing biological denitrification. Ammonia nitrogen serves as an electron donor and, under aerobic conditions, is converted into nitrate nitrogen through the action of nitrifying bacteria, thus promoting the removal of COD. Based on the microbial electrolysis, nitrification and denitrification in the water are achieved, and the electron transport capacity is improved, promoting the generation of extracellular polymers of microorganisms and improving the pollutant degradation efficiency of microorganisms.

[0029] Furthermore, it also includes the following steps:

[0030] The concentrations of turbidity, dissolved oxygen, microorganisms, COD, NH3-N and water flow rate in the water body are detected in real time and transmitted to the PLC controller via an A / D converter. When the water quality does not meet the standard and the free radical concentration reaches the set low limit, the packing material in the suspended ball (31) is replaced. When the water quality meets the standard, the drive motor (135) of the running device (13) is automatically started by the PLC controller, which drives the walking wheels (134) to move the ecological floating bed along the track (131) to the adjacent water area to continue degrading pollutants. When the pollutant concentration reaches the set low limit, the PLC controller automatically shuts down the microbial agent dosing device (46), the nano bubble generator (41) and the solenoid valve.

[0031] Furthermore, the water level is monitored in real time during rainfall. When the water level reaches the set high limit, the hydraulic lifting mechanism (12) is automatically started by the PLC controller to control the hydraulic telescopic rod to run synchronously. After the ecological floating bed is raised to the specified height, the hydraulic telescopic rod is fixed to lock the rising height, ensuring smooth river flow and successful water drainage.

[0032] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0033] (1) This utility model is based on sulfur autotrophic denitrification biological denitrification technology. It utilizes microbial metabolism with sulfur and external electrons as electron donors to simultaneously carry out denitrification and nitrification. It adopts a series-parallel electrode connection method to increase the growth sites of microorganisms, improve electron transport capacity, promote the generation of extracellular polymers of microorganisms, and improve the pollutant degradation efficiency of microorganisms.

[0034] (2) By synergistically coupling microbial electrolysis-ecological floating bed technology, the comprehensive purification capacity of the floating bed is enhanced. The plant root system becomes a carrier for microbial aggregation. The micro-electrolysis environment in the water can enhance the metabolic capacity of microorganisms and improve the efficiency of oxidation-reduction reaction, thereby improving the degradation and remediation efficiency of pollutants such as COD, nitrogen and phosphorus in the water, and realizing water purification and ecological restoration. Attached Figure Description

[0035] Figure 1 This is a structural diagram of the ecological floating bed of this device;

[0036] Figure 2 This is a plan view of the ecological floating bed of this device;

[0037] Figure 3 This is a structural diagram of the transport device of this apparatus;

[0038] Figure 4 This is a plan view of the electrode arrangement in Embodiment 2.

[0039] In the diagram: The walking mechanism includes: 11. Base; 12. Hydraulic lifting mechanism; 13. Running device; 131. Track; 132. Connecting main beam; 133. Connecting secondary beam; 134. Walking wheel; 135. Drive motor; 136. Wheel mating seat; 137. Stabilizing seat; 138. Support frame; The ecological floating bed includes: 21. Emergent plant area; 211. Planting chamber; 212. Cathode electrode; 22. Photovoltaic device area; 221. Photovoltaic panel; 222. Control cabinet; 223. Battery; The underwater microbial electrolysis module includes: 31. Suspended ball; 32. Anode electrode; The microbial aeration and biofilm formation device includes: 41. Nanobubble generator; 42. Air supply pipe; 43. Microporous aeration head; 44. Carbon fiber aquatic plants; 45. Microbial agent delivery pipe; 46. Microbial agent dosing device. Detailed Implementation

[0040] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0041] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] This invention utilizes the aerobic, anoxic, and anaerobic environments that arise with water depth, creating potential differences that provide favorable conditions for microbial electrolysis. By coupling microbial electrolysis and ecological floating bed technologies, the synergistic effect of aquatic plants and microorganisms promotes the production of extracellular polymers and root secretions, increases the potential difference in the water, improves the efficiency of redox reactions, and enhances pollutant removal efficiency. The more developed the plant root system, the more significant the purification effect. Ecological floating beds are low-cost, easy to operate and maintain, and have broad application prospects.

[0045] Example 1

[0046] from Figures 1-3 As can be seen, the remediation device based on microbial electrolysis-ecological floating bed in this embodiment includes a walking mechanism, an ecological floating bed, and an underwater microbial electrolysis module; the walking mechanism is equipped with an ecological floating bed, the bottom of the ecological floating bed is equipped with an underwater microbial electrolysis module, and aquatic plants with well-developed root systems are planted on the ecological floating bed;

[0047] The ecological floating bed is divided into an emergent plant area (21) and a photovoltaic device area (22). The emergent plant area (21) is equipped with a plant planting cavity (211), and the planting cavity (211) is equipped with a cathode electrode (212). The upper part of the cathode electrode (212) is in contact with the air, and the lower part passes through the planting cavity and is in contact with the water body, with a length of 10cm entering the water body. The photovoltaic device area (22) is equipped with a photovoltaic panel (221) and a controller (222). The photovoltaic panel is connected to a storage battery (223) through the controller. The negative terminal of the storage battery (223) is connected to the upper part of the cathode electrode (212) through a wire.

[0048] The underwater microbial electrolysis module includes a suspended ball (31), an anode electrode (32), and a wire. The outer wall of the suspended ball (31) is hollowed out and the interior is filled with a mixture of sulfur autotrophic denitrification filler and iron-based filler. The denitrification filler is a mixture of sodium sulfide and persulfate particles with a particle size of 2-6 mm. The iron-based filler is a mixture of zero-valent iron and activated carbon particles with a particle size of 2-6 mm. Persulfate and zero-valent iron react slowly to generate sulfate free radicals, which can further remove heavy metals and organic pollutants from the water. The suspended ball (31) also has an anode electrode (32) embedded inside. Both ends of the electrode are connected to wires and connected in series to form a string of suspended filler, which is suspended on the bottom support frame of the ecological floating bed. The wire at the top of the string of suspended filler is also connected to the positive terminal of the battery (223). The cathode electrode (212) and the anode electrode (32) are graphite rods or porous carbon rods. The wire is one of titanium wire, stainless steel wire, or copper wire.

[0049] The planting cavity (211) is also filled with a soil layer, a zeolite layer, and an iron-carbon filler layer; the soil layer is 10-15 cm thick, the zeolite layer is 10-15 cm thick, and the iron-carbon mixture layer is 15-20 cm thick; emergent plants are planted in the planting cavity, and small holes with a diameter of 3-5 mm are evenly opened at the bottom of the planting cavity; so that the roots of the aquatic plants can penetrate through the bottom of the planting cavity and extend into the water body; the iron-carbon filler layer is a mixture of sponge iron and activated carbon particles, the sponge iron powder has a particle size of 2-3 mm, and the activated carbon powder has a particle size of 1-3 mm; the sponge iron powder and activated carbon powder are evenly mixed at a mass ratio of 1-2:2-3 to obtain a mixed powder, which is then prepared into particles with a particle size of 1-5 mm; the sponge iron and activated carbon form a galvanic cell, which oxidizes and flocculates the heavy metals in the water body through oxidation-reduction, and removes them through adsorption by the roots of emergent plants.

[0050] The walking mechanism includes a base (11), a hydraulic lifting mechanism (12), and a running device (13); the hydraulic lifting mechanism (12) includes a hydraulic cylinder bottom fixing seat, a hydraulic cylinder body, and a top fixing seat; the running device (13) includes a track (131), a connecting main beam (132), a connecting secondary beam (133), walking wheels (134), and a drive motor (135); the base (11) is a reinforced concrete structure foundation with pre-drilled bolt holes and a pre-embedded steel plate on the top of the foundation. A connecting structure is provided on the base for connecting with the hydraulic cylinder bottom fixing seat (121). Two or more are provided on one side of the base; one or more hydraulic cylinders are provided on each base as needed; the hydraulic cylinder top fixing seat is connected to the bottom of the track (131) of the running device (13) through a track connecting fastener, and the running device (13) is driven to lift through the hydraulic lifting mechanism (12); an ecological floating bed is provided on the running device (13), and the ecological floating bed is driven to walk along the track laying extension direction by the driving force provided by the drive motor (135).

[0051] The connecting main beams (132) of the operating device (13) are arranged in groups. The connecting main beams (132) are provided with walking wheel mating seats (136). The mating seats (136) are rotatably installed with movable walking wheels (134). The inner side of the mating seats (136) is fixedly installed with wheel stabilizing seats (137). The side of the stabilizing seats (137) is fixedly installed with a drive reduction motor (135). The output end of the reduction motor (135) passes through one end of the corresponding stabilizing seat (137) and mating seat (136) respectively, and is fixed to the other end of the corresponding walking wheel (134). The two ends of the connecting main beams (132) are fixed to the two ends of the connecting secondary beams (133) to form the main frame. The main frame is provided with a support frame (138), and an ecological floating bed is provided on the support frame.

[0052] The photovoltaic device area (22) is also equipped with a control cabinet, which consists of a PLC control module, a control panel and a wireless remote controller, for remote control of the automatic operation of the equipment; the PLC control module includes a data acquisition system, a PLC controller and an execution module, the data acquisition system includes a conductivity sensor, a turbidity sensor, a dissolved oxygen sensor, a microbial sensor, a COD sensor, an NH3-N sensor, a free radical sensor, a rate sensor, a liquid level sensor and an A / D converter; the water quality detection sensor is installed at the bottom of the ecological floating bed, and the water quality detection information is input to the PLC controller through the A / D converter;

[0053] The PLC controller is connected to the execution module, which includes a hydraulic lifting mechanism (12), a drive motor (135), a nano bubble generator (41), a microbial agent dosing device (46), and a solenoid valve; the execution module is powered by green driving electricity provided by a photovoltaic power generation system.

[0054] The aquatic plants mentioned are emergent plants with well-developed root systems and strong pollution tolerance, including one or more of reeds, cattails, irises, water onions, water celery, pickerelweed, loosestrife, and canna lilies, mainly native plants; to enhance the aesthetic appeal of the river landscape and restore the aquatic ecological environment.

[0055] Example 2

[0056] Based on the above embodiments, a microbial aeration and biofilm attachment device is also provided at the bottom of the ecological floating bed. The microbial aeration and biofilm attachment device includes an aeration module and a biofilm attachment module. The aeration module includes a nanobubble generator (41), an air supply pipe (42), and a microporous aeration head (43). The nanobubble generator (41) is located at the top of the ecological floating bed, and the air supply pipe (42) is located at the bottom of the ecological floating bed. The nanobubble generator (41) is connected to the air supply pipe (42). The air supply pipe (42) is equipped with a solenoid valve and an aeration hole, and the microporous aeration head (43) is installed at the corresponding aeration hole position. The biofilm attachment module includes carbon fiber aquatic plants (44), a microbial agent delivery pipe (45), and a microbial agent dosing device (46). The microbial agent dosing device (46) is connected to the agent delivery pipe (45). The agent delivery pipe (45) is equipped with a solenoid valve and a discharge hole. The carbon fiber aquatic plants (44) are suspended vertically downward on the agent delivery pipe (45).

[0057] Example 3

[0058] Based on the above embodiments, the microbial electrolysis-ecological floating bed remediation method of this embodiment includes the following steps:

[0059] First, the nanobubble generator (41), microbial agent dosing device (46), and solenoid valve on the pipeline are turned on by the PLC control module to replenish dissolved oxygen and microbial agents to the water body. The agent addition flow rate is 0.5-1.0 m3 / h. The added agents are indigenous microorganisms that have been domesticated and screened, including photosynthetic bacteria, nitrifying bacteria, Bacillus subtilis, actinomycetes, or fungi. The agents are transported to carbon fiber aquatic plants through the delivery pipeline. Initial biofilm formation occurs after 3-6 days, and the indigenous microbial aggregates reach a stable state after 10 days. The microorganisms absorb and degrade pollutants, eventually forming metabolic products such as H2O, CO2, and SO42+. The dissolved oxygen and microbial concentrations are high around the aquatic plants, which enhances the ability of microorganisms and aquatic plants to synergistically absorb and degrade COD, nitrogen, and phosphorus.

[0060] Secondly, the battery (223) switch is turned on, and electrons are supplied to the cathode electrode through the wire. The electrons enter the water and, together with the reduced sulfur in the sulfur autotrophic filler in the water suspension ball (31), serve as electron donors. Nitrate nitrogen and nitrite nitrogen serve as electron acceptors. Under the action of denitrifying bacteria, nitrate nitrogen is reduced to gaseous nitrogen, thus completing biological denitrification. Ammonia nitrogen serves as an electron donor and, under aerobic conditions, is converted into nitrate nitrogen through the action of nitrifying bacteria, thus promoting the removal of COD. Nitrification and denitrification in water are achieved based on microbial electrolysis, and the electron transport capacity is improved, promoting the generation of extracellular polymers of microorganisms and improving the pollutant degradation efficiency of microorganisms. All microorganisms in the reaction system simultaneously carry out denitrification and nitrification. Furthermore, the concentrations of turbidity, dissolved oxygen, microorganisms, COD, NH3-N, and water flow rate in the water body are simultaneously and in real time, and transmitted to the PLC controller via an A / D converter. When the water quality does not meet the standards and the free radical concentration reaches the set low limit, the packing material in the suspended ball (31) is replaced. When the water quality meets the standards, the drive motor (135) of the operating device (13) is automatically started by the PLC controller, driving the walking wheels (134) to move the ecological floating bed along the track (131) to the adjacent water area to continue degrading pollutants. When the pollutant concentration reaches the set low limit, the PLC controller automatically shuts down the microbial agent dosing device (46), the nano bubble generator (41), and the solenoid valve.

[0061] Example 4

[0062] Based on Example 3, the following steps are also included: real-time detection of water level during rainfall; when the water level reaches the set high limit, the hydraulic lifting mechanism (12) is automatically started by the PLC controller to control the hydraulic telescopic rod to run synchronously, and the ecological floating bed is lifted to the specified height and the hydraulic telescopic rod is fixed to lock the rising height, so as to ensure the smooth flow of the river and smooth water drainage.

[0063] Example 5

[0064] like Figure 4 As shown, the ecological floating bed electrodes can also be arranged in other ways: several electrodes are placed in the plant planting cavity. The electrodes are rod-shaped and arranged in a row, in the form of anode-cathode-anode. The anode electrode is set 1m away from the side of the photovoltaic device area (22), the cathode electrode is set in the middle, and the anode electrode is set at a spacing of 30cm. The distance between each electrode pair is less than 30cm. The redox potential, conductivity and temperature of the environment within the effective range of the electrode pair are measured by the monitoring system. Under the condition of not affecting the normal operation of the electrode system, a large sustainable DC current is identified and supplied to improve the electron transfer capacity and redox reaction efficiency, and accelerate the remediation process of pollutants.

[0065] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the protection scope of the present invention.

[0066] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A remediation device based on microbial electrolysis-ecological floating bed, characterized in that, The device includes a walking mechanism, an ecological floating bed, an underwater microbial electrolysis module, and / or a microbial aeration and biofilm attachment device. The ecological floating bed is mounted on the walking mechanism; The bottom of the ecological floating bed is equipped with an underwater microbial electrolysis module and / or a microbial aeration and biofilm attachment device, and aquatic plants are planted on the ecological floating bed. The walking mechanism includes a lifting mechanism mounted on the base and a running device mounted on the lifting mechanism.

2. The remediation device based on microbial electrolysis-ecological floating bed according to claim 1, characterized in that, The ecological floating bed is divided into an emergent plant area (21) and a photovoltaic device area (22). The emergent plant area (21) is equipped with a plant planting cavity (211), and the planting cavity (211) is equipped with a cathode electrode (212). The upper part of the cathode electrode (212) is in contact with the air, and the lower part passes through the planting cavity and is in contact with the water. The photovoltaic device area (22) is equipped with a photovoltaic panel (221) and a controller (222). The photovoltaic panel is connected to a storage battery (223) through the controller. The negative terminal of the storage battery (223) is connected to the upper part of the cathode electrode (212) through a wire. The underwater microbial electrolysis module includes a suspended ball (31), an anode electrode (32), and a wire; the outer wall of the suspended ball (31) is hollowed out and the anode electrode (32) is embedded inside, and both ends of the electrode are connected to the wire; the suspended ball (31) and the anode electrode (32) are connected in series by the wire to form a suspended filler string, which is suspended on the bottom support frame of the ecological floating bed; the wire at the top of the suspended filler string is also connected to the positive terminal of the battery (223).

3. The remediation device based on microbial electrolysis-ecological floating bed according to claim 2, characterized in that, The cathode electrode (212) and anode electrode (32) are graphite rods or porous carbon rods; the wire is one of titanium wire, stainless steel wire, or copper wire.

4. The remediation device based on microbial electrolysis-ecological floating bed according to claim 1, characterized in that, The microbial aeration and biofilm attachment device includes an aeration module and a biofilm attachment module. The aeration module includes a nanobubble generator (41), an air supply pipe (42), and a microporous aeration head (43). The nanobubble generator (41) is located on the upper part of the ecological floating bed, and the air supply pipe (42) is located on the bottom of the ecological floating bed. The nanobubble generator (41) is connected to the air supply pipe (42). An electromagnetic valve is installed on the air supply pipe (42), and an aeration hole is also provided on the air supply pipe (42). A microporous aeration head (43) is installed at the corresponding aeration hole position. The biofilm attachment module includes carbon fiber aquatic plants (44), a microbial agent delivery pipe (45), and a microbial agent dosing device (46). The microbial agent dosing device (46) is connected to the agent delivery pipe (45). An electromagnetic valve is installed on the agent delivery pipe (45), and a discharge hole is also provided on the agent delivery pipe (45). The carbon fiber aquatic plants (44) are suspended vertically downward on the agent delivery pipe (45).

5. The remediation device based on microbial electrolysis-ecological floating bed according to claim 1, characterized in that, It also includes water level detection devices, water quality detection devices, and control devices; The control device controls the lifting mechanism to raise or lower the ecological floating bed based on the results of the water level detection device; or The control device controls the operating device to move the ecological floating bed horizontally to the predetermined position based on the results of the water quality testing device.

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