Electrolysis intelligent connection wetland purification industrial wastewater device

Abstract

The invention belongs to the technical field of wastewater treatment devices, and discloses an electrolysis intelligent connection wetland industrial wastewater purification device which comprises a tank body, and a water inlet and a water outlet are formed in the two ends of the tank body respectively; the treatment system comprises an electrolytic treatment unit and a wetland treatment unit, an anode of the electrolytic treatment unit is located on the side, close to the water inlet, in the tank body, the wetland treatment unit is located on the side, close to the water outlet, in the tank body, and a cathode of the electrolytic treatment unit is located in the wetland treatment unit. Then carrying out purification treatment through the wetland treatment unit; the aeration system is positioned under the cathode of the electrolytic treatment unit; the energy supply system is arranged at the top end of the tank body and is used for supplying power to the electrolytic treatment unit and the aeration system. Through the synergistic effect of electrolysis and wetland, efficient, stable and low-energy-consumption treatment of high-concentration refractory industrial wastewater is realized, and the device has the advantages of modularization, eco-friendliness and adaptability to distributed scenes.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment devices, and particularly relates to an electrolytic intelligent wetland purification device for industrial wastewater. Background Technology

[0002] Industrial wastewater, especially high-concentration, recalcitrant organic wastewater from industries such as chemical, dyeing, and pharmaceutical manufacturing, is characterized by its complex composition, high toxicity, and poor biodegradability, making it a key focus and challenge in current water pollution control. To address this challenge, existing technologies have primarily developed various approaches, including physicochemical methods, biochemical treatment methods, advanced oxidation methods, and ecological treatment methods.

[0003] However, existing technological approaches to treating this type of wastewater generally suffer from multiple contradictions: It is difficult to achieve both "high-efficiency degradation" and "low energy consumption": Although a single advanced oxidation technology (such as electrolysis) can achieve high-efficiency degradation, it comes at the cost of high energy consumption, making it uneconomical and running counter to the energy conservation and emission reduction requirements under the "dual carbon" strategy.

[0004] There is a contradiction between "stable compliance" and "eco-friendly": While artificial wetland technology is eco-friendly, it has low treatment efficiency and poor stability, and cannot independently handle the treatment of industrial wastewater, especially high-concentration and recalcitrant wastewater, making it difficult to guarantee stable compliance with discharge standards.

[0005] The technologies are limited in function and lack synergy: existing technologies are mostly used independently or in simple series, failing to achieve deep coupling and complementary advantages between technologies. For example, intermediate products generated by electrolysis may inhibit subsequent biochemical units, while the buffering capacity of wetlands has not been effectively used to mitigate energy consumption fluctuations in the electrolysis unit.

[0006] Large footprint and poor adaptability: To ensure treatment effectiveness, constructed wetlands require a large area, which limits their application in industrial clusters where land resources are scarce. Furthermore, existing devices lack modularity and intelligent control capabilities, making it difficult to flexibly adapt to different water qualities, quantities, and site requirements.

[0007] Therefore, there is an urgent need for an electrolytic intelligent wetland purification device for industrial wastewater to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide an electrolytic intelligent wetland purification device for industrial wastewater, so as to solve the problems existing in the prior art.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention provides an electrolytic intelligent wetland purification device for industrial wastewater, comprising: The tank has an inlet and an outlet at both ends, and external sewage enters the tank through the inlet. The treatment system is installed in the tank. The treatment system includes an electrolysis treatment unit and a wetland treatment unit. The anode of the electrolysis treatment unit is located in the tank near the inlet, and the wetland treatment unit is located in the tank near the outlet. The cathode of the electrolysis treatment unit is located in the wetland treatment unit. Wastewater entering from the outside undergoes electrolysis pretreatment in the electrolysis treatment unit and then undergoes purification treatment in the wetland treatment unit. An aeration system is installed inside the tank and located directly below the cathode of the electrolysis treatment unit; A power supply system is installed at the top of the tank to supply power to the electrolysis treatment unit and the aeration system.

[0010] According to the present invention, an electrolytic intelligent wetland purification industrial wastewater device is provided, wherein the electrolytic treatment unit includes an anode plate and a cathode layer, the anode plate and the cathode layer are connected by a wire to form a closed electric field, the anode plate is fixedly connected to the side of the tank near the water inlet, and the cathode layer is located inside the wetland treatment unit.

[0011] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein the wetland treatment unit includes a packing layer and a plant layer, the packing layer is filled in the tank, the plant layer is planted on the packing layer, and the cathode layer is located within the packing layer.

[0012] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein the aeration system includes a plurality of microporous aeration pipes, the microporous aeration pipes are laid at the bottom of the tank and located directly below the cathode layer, the microporous aeration pipes are connected to an external aeration pump, and the aeration pump is connected to the power supply system.

[0013] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein the power supply system includes a solar photovoltaic panel installed at the top of the tank, and an energy storage battery and an energy conversion module are fixedly connected to the tank, and the solar photovoltaic panel is connected to the energy storage battery and the energy conversion module.

[0014] According to the present invention, the anode plate is a titanium plate with a Ru-Ir oxide composite coating on its surface; the cathode layer is a foamed nickel granular structure with a porosity of 80%-90%.

[0015] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein the packing layer comprises, from bottom to top, a lower layer of quartz sand, a middle layer of volcanic rock-foamed nickel mixture, and an upper layer of ceramsite.

[0016] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein the plant layer includes reeds and calamus, and the root system of the plant layer extends into the middle layer of volcanic rock-foam nickel mixture.

[0017] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein the bottom end of the tank is provided with an inclined surface, the inlet is close to the highest end of the inclined surface, and the outlet is close to the lowest end of the inclined surface.

[0018] According to the present invention, an electrolytic intelligent wetland purification device for industrial wastewater is provided, wherein a baffle plate and a filter screen are provided on the outlet.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects: This invention provides an electrolytic intelligent wetland purification device for industrial wastewater. Through a synergistic treatment mode of electrolytic pretreatment and wetland deep purification, the highly reactive hydroxyl radicals generated by the electrolysis unit efficiently degrade recalcitrant organic matter, improving the biodegradability of the wastewater. The wetland unit then utilizes microorganisms and plants for further degradation and absorption. This invention automatically adjusts the electrolysis voltage and aeration mode, solving the problem of unstable efficiency caused by large fluctuations in industrial wastewater quality in traditional constructed wetlands. It adopts a modular, integrated tank design, compactly integrating electrolysis, wetland, power supply, and control systems. Compared to traditional electrolysis + wetland planar combination processes, it reduces the footprint by ≥30%, making it suitable for industrial parks with limited land resources. This invention achieves efficient, stable, and low-energy treatment of high-concentration, recalcitrant industrial wastewater through the synergistic effect of electrolysis and wetlands, possessing the advantages of modularity, eco-friendliness, and adaptability to decentralized scenarios. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the power supply system structure of the present invention; Figure 3 This is a schematic diagram of the aeration system structure of the present invention; Figure 4 This is a schematic diagram of the anode plate structure of the present invention; The components include: 1. Tank; 2. Anode plate; 3. Cathode layer; 4. Packing layer; 5. Plant layer; 6. Microporous aeration pipe; 7. Solar photovoltaic panel; 8. Energy storage battery and power conversion module. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figures 1-4 This invention provides an electrolytic intelligent wetland purification device for industrial wastewater, comprising: Tank 1 has an inlet and an outlet at both ends, and external sewage enters the tank 1 through the inlet. The treatment system is set inside the tank 1. The treatment system includes an electrolysis treatment unit and a wetland treatment unit. The anode of the electrolysis treatment unit is located inside the tank 1 near the inlet, and the wetland treatment unit is located inside the tank 1 near the outlet. The cathode of the electrolysis treatment unit is located inside the wetland treatment unit. Wastewater entering from the outside undergoes electrolysis pretreatment in the electrolysis treatment unit and then undergoes purification treatment in the wetland treatment unit. An aeration system is installed inside tank 1 and located directly below the cathode of the electrolysis treatment unit; The power supply system, located at the top of tank 1, is used to supply power to the electrolysis treatment unit and the aeration system.

[0025] In one embodiment of the present invention, a synergistic treatment mode of electrolytic pretreatment + wetland deep purification is adopted, in which highly active hydroxyl radicals generated by the electrolysis unit are used to efficiently degrade recalcitrant organic matter, thereby improving the biodegradability of wastewater, and then the microorganisms and plants in the wetland unit carry out deep degradation and absorption.

[0026] As an optional implementation, the electrolysis treatment unit includes an anode plate 2 and a cathode layer 3. The anode plate 2 and the cathode layer 3 are connected by wires to form a closed electric field. The anode plate 2 is fixedly connected to the side of the tank 1 near the water inlet, and the cathode layer 3 is located inside the wetland treatment unit.

[0027] In one embodiment of the present invention, wastewater is electrolyzed using an anode plate 2 and a cathode layer 3.

[0028] As an optional implementation, the wetland treatment unit includes a filler layer 4 and a plant layer 5. The filler layer 4 is filled in the tank 1, the plant layer 5 is planted on the filler layer 4, and the cathode layer 3 is located in the filler layer 4.

[0029] In one embodiment of the present invention, wastewater is subjected to deep wetland purification treatment through a packing layer 4 and a plant layer 5.

[0030] As an optional implementation, the aeration system includes multiple microporous aeration pipes 6, which are laid at the bottom of the tank 1 and located directly below the cathode layer. The microporous aeration pipes 6 are connected to an external aeration pump, which is connected to the power supply system.

[0031] In one embodiment of the present invention, multiple microporous aeration pipes 6 are laid 5 cm from the bottom of the tank 1 at the bottom and directly below the cathode layer 3. The aeration pump is driven by a power supply system. The system is linked to an online COD sensor and only turns on when the influent COD > 300 mg / L, using an intermittent aeration mode of 30 min on and 60 min off. During aeration, dissolved oxygen is replenished to the cathode area, enhancing the generation of hydroxyl radicals and improving the degradation efficiency of organic matter. When aeration stops, the cathode particles can directly provide electrons to pollutants or stimulate anaerobic microbial communities to reduce and degrade pollutants, especially for halogenated organic pollutants, where cathode reduction can achieve detoxification. This intermittent mode saves 40% more energy than continuous aeration and does not damage the microbial community structure in the wetland. When the pollutant concentration is too high, aeration not only enables oxygen reduction at the cathode to produce H2O2, which is then decomposed into ·OH to further enhance oxidation capacity, but also creates aerobic conditions for the wetland environment, promoting the growth and reproduction of aerobic microorganisms and improving the degradation effect.

[0032] As an optional implementation, the energy supply system includes a solar photovoltaic panel 7 installed at the top of the tank 1, and an energy storage battery and an energy conversion module 8 are fixedly connected to the tank 1. The solar photovoltaic panel 7 is connected to the energy storage battery and the energy conversion module 8.

[0033] In one embodiment of the present invention, the power of the photovoltaic panels is matched according to the processing scale of the device: a 1300W monocrystalline silicon photovoltaic panel is configured for processing 1 ton of water per day, and a 15000W monocrystalline silicon photovoltaic panel is configured for processing 10 tons of water per day. The solar photovoltaic panels 7 are installed on a bracket at the top of the tank 1, with the bracket tilted at 30° to maximize sunlight reception efficiency. The daily power generation of the solar photovoltaic panels 7 can meet more than 90% of the device's energy consumption needs, with the remaining energy consumption supplemented by energy storage batteries. The energy storage battery and power conversion module 8 include an energy storage battery, using a lithium battery pack, with a capacity adapted to the photovoltaic panel power: a 200Ah lithium battery for a 1300W photovoltaic panel, and a 1600Ah lithium battery for a 15000W photovoltaic panel. The lithium battery pack is installed in a waterproof box on the side of the tank 1 to prevent moisture damage. The power conversion module includes an inverter and a voltage stabilizer, which converts the DC power output from the solar photovoltaic panel 7 into a stable AC voltage of 12-24V to power the electrolysis unit and aeration system, preventing current fluctuations from damaging the electrodes or inhibiting microbial activity.

[0034] As an optional implementation, the anode plate 2 is a titanium plate with a Ru-Ir oxide composite coating on its surface; the cathode layer 3 is a nickel foam granular structure with a porosity of 80%-90%.

[0035] In one embodiment of the present invention, the anode plate 2 is a ruthenium-iridium oxide-coated titanium anode. A 2mm thick titanium plate is selected as the substrate, and the surface is coated with a Ru-Ir oxide composite coating using a thermal decomposition method. The specific method is as follows: the titanium sheet is polished with 800-grit sandpaper to remove the oxide layer. Then, the titanium sheet is placed in a boiling 5% sodium carbonate solution to remove oil stains. After 30 minutes, it is removed, rinsed with deionized water, and then cleaned with an ultrasonic cleaner for 5-10 minutes. Next, it is placed in a boiling 10%-20% oxalic acid solution for acid etching for 2-3 hours until a uniform gray surface is formed. After removal, it is rinsed with deionized water, then cleaned with an ultrasonic cleaner for 5-10 minutes. After drying, it is placed in anhydrous ethanol for later use. Ruthenium trichloride, chloroiridic acid, and tetrabutyl titanate were weighed in a molar ratio of 2:1:7 and dissolved separately in a certain amount of anhydrous ethanol. After ultrasonic stirring to ensure uniform mixing, the solutions were added sequentially to a certain amount of a mixed solution of citric acid (CA) and ethylene glycol (EG). The mixture was stirred with a magnetic stirrer to ensure uniform mixing and obtained a coating solution. After standing for 24 hours, the coating solution was evenly applied to the pretreated titanium substrate with a soft brush and dried in a drying oven at 120°C for 10 minutes. Then, it was sintered in a box furnace at a certain temperature for 10 minutes, removed, and air-cooled to room temperature. The coating thickness was controlled at 5-8 μm. Finally, it was thermally oxidized at the same sintering temperature for 1 hour to ensure complete oxidation of the coating. The anode plate 2 was vertically inserted into the water inlet area of ​​the tank 1. The anode plate 2 consisted of three square regions, which were independently connected to the cathode material to form a circuit, realizing a zoned power supply system. Anode plate 2 exhibits high oxidation removal efficiency for recalcitrant organic wastewater. When treating 20 mg / L chlorophenol wastewater, the current density is 68 mA / cm². 2 After 120 minutes of degradation, the removal rate of chlorophenol using ruthenium-iridium oxide-coated titanium anodes reached 99.4%. Furthermore, the ruthenium-iridium oxide-coated titanium anodes exhibit strong corrosion resistance and stability; after 60 consecutive cycles, no significant corrosion was observed, and the chlorophenol removal rate remained above 97%. Therefore, ruthenium-iridium oxide-coated titanium anodes have a longer service life. Traditional graphite electrodes require 12 hours of degradation to achieve a chlorophenol removal rate of 90%, which significantly increases reaction time and operating energy consumption, reducing wastewater treatment efficiency. Therefore, choosing ruthenium-iridium oxide-coated titanium anodes improves wastewater treatment efficiency while reducing electrode usage costs.

[0036] The cathode layer 3 uses granular nickel foam with a porosity of 80%-90% and a particle size of 5-10 mm, which is uniformly mixed in the volcanic rock filler in the middle layer of the wetland unit at a volume ratio of 1:3. The nickel foam cathode and the ruthenium-iridium oxide-coated titanium anode form a closed electric field through a wire, eliminating the need for an additional flat cathode structure; its porous structure can provide an attachment carrier for microorganisms, forming an "electrode-microorganism" synergistic degradation system, which improves the pollutant removal rate by 25% compared with traditional flat cathodes.

[0037] In one embodiment of the invention, a zoned power supply system is further included, equipped with an intelligent control terminal and a built-in online COD sensor. The sensor probe is installed at the inlet of the tank 1. When the detected influent COD > 300 mg / L, the system automatically adjusts the voltage of the anode plate 2 to 24V; when COD ≤ 300 mg / L, the voltage drops to 12V. Each anode plate 2 is independently controlled, and the power can be adjusted according to the differences in water concentration in different areas of the tank 1, saving 15%-20% energy compared to the traditional overall power supply method. The control terminal integrates overload protection to prevent voltage fluctuations from damaging the electrodes.

[0038] As an optional implementation, the filler layer 4 comprises, from bottom to top, a lower layer of quartz sand, a middle layer of volcanic rock-foamed nickel mixture, and an upper layer of ceramsite.

[0039] In one embodiment of the present invention, the filler layer 4 and the cathode layer 3 are filled in layers in the following order: bottom layer quartz sand → middle layer volcanic rock-foamed nickel mixture → top layer ceramsite, with a total height of 60-80cm. The thickness ratio of each layer of the filler layer 4 is 1:1:1. The bottom layer quartz sand has a particle size of 5-8mm. After cleaning, it is spread evenly at the bottom of the tank. Its uniform porosity can ensure the stability of the electric field and avoid electric field distortion caused by irregular filler. At the same time, it reduces the physical wear of the cathode particles by water flow. The middle layer volcanic rock-foamed nickel mixture has a particle size of 10-15mm. It is mixed with granular foamed nickel and then filled. Its porous structure is conducive to microbial biofilm formation and can adsorb small molecule intermediate pollutants generated by electrolysis. It works synergistically with the cathode to achieve the dual effects of electrolytic oxidation and biodegradation. The top layer ceramsite has a particle size of 15-20mm. It has good water retention and air permeability and can filter suspended solids in the water to avoid clogging of the bottom filler. At the same time, it provides support for plant root growth. The bottom layer of quartz sand ensures uniform water distribution, the middle layer of volcanic rock provides a high specific surface area to promote biofilm formation, and the top layer of ceramsite effectively prevents caking caused by excessive biofilm growth. This combination of layered gradation and slightly inclined flow channels not only optimizes the pore structure and water flow path, but also significantly reduces the physical risks of packing blockage and water flow short-circuiting at the source, ensuring the long-term stable operation of the treatment unit.

[0040] As an alternative implementation, the plant layer 5 includes reeds and calamus, with the root system of the plant layer 5 extending into the middle layer of volcanic rock-foam nickel mixture.

[0041] In one embodiment of the present invention, the plant layer 5 consists of two electrolysis-resistant and pollution-resistant plants: reeds and calamus. These are planted along the gaps between the electrode groups, with a plant spacing of 30 cm and a planting depth of 10 cm, extending their roots to the middle layer of volcanic rock filler. Reed roots can absorb heavy metal ions such as cadmium and lead from wastewater, while calamus can regulate dissolved oxygen levels in the wetland and promote the activity of aerobic microorganisms. The alternating planting of these two plants combines purification functions with ecological landscape value, solving the problem of traditional artificial wetland plants being susceptible to electrolytic toxicity.

[0042] As an optional implementation, the bottom of the tank 1 is provided with an inclined surface, with the water inlet near the highest end of the inclined surface and the water outlet near the lowest end of the inclined surface.

[0043] In one embodiment of the present invention, the tank 1 is made of fiberglass or concrete, and is rectangular in shape with a length-to-width ratio of 3:1. The bottom is sloped at 1.5%, with the water inlet end higher and the water outlet end lower, to prevent water accumulation in the tank 1 from causing localized corrosion of the electrodes. The inner wall of the tank 1 is coated with an anti-corrosion coating to enhance corrosion resistance and extend service life.

[0044] As an optional implementation, a baffle plate and a filter screen are provided on the water outlet.

[0045] In one embodiment of the present invention, a baffle plate and a filter screen are installed on the water outlet. The baffle plate is 20cm high and the filter screen has a pore size of 5mm to prevent the upper layer of ceramic particles and plant residues from being lost with the water.

[0046] In one embodiment of the present invention, phenol wastewater is selected as the treatment target. The wastewater quality parameters are: initial COD concentration of 580 mg / L, phenol concentration of 125 mg / L, pH value of 7.2, and water temperature of 24℃. The electrolysis unit of the device is equipped with a ruthenium-iridium oxide coated titanium anode plate (50 cm long × 30 cm wide, coating thickness of 7 μm); foamed nickel cathode particles (particle size of 8 mm, porosity of 85%) are mixed in the wetland middle layer volcanic rock packing at a volume ratio of 1:3; the zoned power supply system is equipped with an online COD sensor (detection accuracy ±5 mg / L), with preset voltage adjustment thresholds: the voltage is adjusted to 24V when COD > 300 mg / L, and the voltage is adjusted to 12V when COD ≤ 300 mg / L.

[0047] Industrial wastewater is pumped to tank 1 via a centrifugal pump at a flow rate of 0.5 m³ / h. A COD online sensor collects water quality data in real time, displaying a COD concentration of 580 mg / L, triggering the high-voltage operation mode of the zoned power supply system, and automatically adjusting the anode voltage to 24V. As the wastewater flows through anode plate 2, the ruthenium-iridium oxide-coated titanium anode generates strong oxidants such as hydroxyl radicals (·OH) under a current density of 45 mA / cm², directly oxidizing phenols and benzene ring recalcitrant organic compounds in the wastewater. The foamed nickel cathode, mixed with the intermediate packing layer, forms a closed electric field, and the biodegrading bacteria attached to its surface simultaneously biodegrade small molecule organic compounds. The electrolysis reaction time is controlled to 60 min.

[0048] After pretreatment, wastewater samples were collected, and the COD concentration was reduced to 165 mg / L, with a COD removal rate of 71.6%; the phenol concentration was reduced to 8.2 mg / L, with a phenol removal rate of 93.4%; the effluent B / C ratio (biodegradability index) increased from 0.21 to 0.48, indicating a significant improvement in biodegradability, meeting the influent requirements for subsequent deep purification in the wetland unit. Deep purification in the wetland: The pretreated wastewater flows through a layered packing layer. The quartz sand layer stabilizes the electric field, the volcanic rock-foamed nickel layer completes adsorption and biodegradation, and the ceramsite layer filters suspended solids. Reed and calamus roots absorb heavy metals and regulate dissolved oxygen, achieving deep purification. The purified wastewater is discharged after being filtered by baffles and a filter screen. The effluent COD concentration is 32.8 mg / L, with a removal rate of 94.3%, and the effluent phenol concentration is 5.5 mg / L, with a removal rate of 95.6%. This process consumes 0.41 kWh / m³, which is 18% more energy-efficient than the traditional overall power supply mode. After 30 days of continuous operation, the electrode condition was tested. The ruthenium-iridium oxide coated titanium anode showed no obvious corrosion, and the microbial community on the surface of the foamed nickel cathode was stable.

[0049] In one embodiment of the present invention, the RuO2-IrO2 / Ti anode can be replaced with IrO2-Ta2O5 / Ti or BDD (boron-doped diamond) film. The specific preparation method is as follows: BDD / Si ​​preparation: A BDD film is deposited on a Si substrate (10mm x 10mm x 1mm) using an MPCVD system. 11.97 g / L of boron oxide-ethanol solution is used as the boron source, and hydrogen carries the boron source into the CVD chamber. The methane concentration is 2%, the hydrogen flow rate is 200 sccm, the deposition pressure is 6.75 kPa, the deposition temperature is 840℃, and the bubbling hydrogen flow rate is 7 sccm to obtain the BDD / Si ​​electrode. The COD removal rate is 90.72%, but the cost increases by 40%. The nickel foam particles can be replaced with three-dimensional graphene aerogel particles, and 40.0 mg of graphene oxide sheets are ultrasonically dispersed in 20 mL of ultrapure water. A homogeneous suspension was placed in a polytetrafluoroethylene-lined autoclave, sealed, and heated at 180°C for 12 hours. The resulting product was then freeze-dried for 10 hours to obtain a three-dimensional graphene aerogel. Using this electrode, the final COD removal rate in phenol wastewater was 97.36%.

[0050] Power supply strategy: If a stable mains power supply is available on site, the solar module can be removed and replaced with AC / DC rectification, reducing equipment costs by 18%.

[0051] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "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, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An electrolytic intelligent wetland purification device for industrial wastewater, characterized in that, include: The tank (1) has an inlet and an outlet at both ends, and external sewage enters the tank (1) through the inlet. The treatment system is set inside the tank (1). The treatment system includes an electrolysis treatment unit and a wetland treatment unit. The anode of the electrolysis treatment unit is located inside the tank (1) near the inlet. The wetland treatment unit is located inside the tank (1) near the outlet. The cathode of the electrolysis treatment unit is located inside the wetland treatment unit. Wastewater entering from the outside undergoes electrolysis pretreatment through the electrolysis treatment unit and then undergoes purification treatment through the wetland treatment unit. An aeration system is installed inside the tank (1) and located directly below the cathode of the electrolysis treatment unit; The power supply system is located at the top of the tank (1) and is used to supply power to the electrolysis treatment unit and the aeration system.

2. The electrolytic intelligent wetland purification device for industrial wastewater as described in claim 1, characterized in that: The electrolysis treatment unit includes an anode plate (2) and a cathode layer (3). The anode plate (2) and the cathode layer (3) are connected by wires to form a closed electric field. The anode plate (2) is fixedly connected to the tank (1) on the side near the water inlet. The cathode layer (3) is located in the wetland treatment unit.

3. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 2, characterized in that: The wetland treatment unit includes a filler layer (4) and a plant layer (5). The filler layer (4) is filled in the tank (1), the plant layer (5) is planted on the filler layer (4), and the cathode layer (3) is located in the filler layer (4).

4. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 2, characterized in that: The aeration system includes multiple microporous aeration pipes (6), which are laid at the bottom of the tank (1) and located directly below the cathode layer (3). The microporous aeration pipes (6) are connected to an external aeration pump, which is connected to the power supply system.

5. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 1, characterized in that: The energy supply system includes a solar photovoltaic panel (7) installed at the top of the tank (1). An energy storage battery and an energy conversion module (8) are fixedly connected to the tank (1). The solar photovoltaic panel (7) is connected to the energy storage battery and the energy conversion module (8).

6. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 2, characterized in that: The anode plate (2) is a titanium plate with a Ru-Ir oxide composite coating on its surface; the cathode layer (3) is a nickel foam granular structure with a porosity of 80%-90%.

7. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 3, characterized in that: The filler layer (4) consists of a lower layer of quartz sand, a middle layer of volcanic rock-foamed nickel mixture, and an upper layer of ceramsite from bottom to top.

8. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 7, characterized in that: The plant layer (5) comprises reeds and calamus, and the roots of the plant layer (5) extend into the middle layer of volcanic rock-foam nickel mixture.

9. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 1, characterized in that: The bottom of the tank (1) is provided with an inclined surface, the water inlet is close to the highest end of the inclined surface, and the water outlet is close to the lowest end of the inclined surface.

10. The electrolytic intelligent wetland purification device for industrial wastewater according to claim 1, characterized in that: The water outlet is equipped with a baffle plate and a filter screen.

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