Mechanical force catalytic treatment method and system for sewage and contaminated groundwater

Abstract

This invention belongs to the field of wastewater treatment technology and discloses a mechanical catalytic treatment method and system for wastewater and contaminated groundwater. The mechanical catalytic treatment method for wastewater and contaminated groundwater includes the following steps: adding a treatment agent to the wastewater to be treated, mixing and reacting, filtering, and completing the wastewater treatment; wherein, the treatment agent includes at least one of piezoelectric catalytic material and magnetic resin; the mixing reaction is carried out under ultrasonic cavitation and / or spiral aeration conditions; the piezoelectric catalytic material includes a porous plant cellulose fiber carrier and a C3N5 functional layer in situ grown on the surface of the carrier; the magnetic resin includes a benzo-melamine-formaldehyde resin matrix with sulfonic acid groups bonded to a benzene ring and Fe3O4 magnetic nanoparticles uniformly dispersed in the resin matrix. This invention eliminates the need for chemical agents in wastewater treatment, avoids secondary pollution, effectively treats complex water bodies while reducing operating costs, and possesses good environmental friendliness and practicality.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a mechanical catalytic treatment method and system for wastewater and contaminated groundwater. Background Technology

[0002] With the increasing severity of environmental pollution, the treatment of pollutants in various water bodies has become a crucial issue in environmental protection. Water pollutants are diverse, including organic pollutants, heavy metal ions, and nutrients, which may originate from various sources such as industrial emissions, agricultural runoff, and domestic sewage. Traditional physical, chemical, and biological treatment methods all have limitations in treating these pollutants. While physical adsorption is simple to operate, it suffers from difficulties in adsorbent regeneration; chemical oxidation has high treatment efficiency but is prone to secondary pollution; biological treatment has low operating costs but is ineffective against certain recalcitrant organic compounds. These traditional technologies often fail to achieve ideal results when treating complex water bodies, necessitating the development of new and efficient water treatment technologies.

[0003] In recent years, mechanocatalysis technology has attracted widespread attention due to its green and efficient characteristics. This technology requires no chemical reagents, has mild reaction conditions, and shows promising application prospects. However, the energy utilization rate of single ultrasonic treatment is low, typically less than 15%, and its selectivity for pollutants with different properties is poor, making it difficult to achieve broad-spectrum and efficient degradation. Adsorption methods enrich pollutants through porous materials, offering simple operation and controllable costs. Traditional adsorption materials such as activated carbon and resins have good adsorption capacity for organic matter, but regeneration is difficult, and frequent replacement increases operating costs. Magnetic adsorption materials achieve rapid separation through an external magnetic field, improving operational convenience, but the adsorption capacity and selectivity of existing materials still need improvement. Summary of the Invention

[0004] The present invention aims to improve at least one technical problem in the prior art.

[0005] The first aspect of this invention provides a method for the mechanical catalytic treatment of wastewater and contaminated groundwater, comprising the following steps:

[0006] Add the treatment agent to the wastewater to be treated, mix and react, filter, and the wastewater treatment is completed.

[0007] The treatment agent includes at least one of piezoelectric catalytic materials and magnetic resins;

[0008] When the treatment agent is a piezoelectric catalyst, the mixing reaction is carried out under ultrasonic cavitation conditions;

[0009] When the treatment agent is a magnetic resin, the mixing reaction is carried out under ultrasonic cavitation and / or spiral aeration conditions;

[0010] The piezoelectric catalytic material includes a support and a functional layer grown in situ on the surface of the support. The support is a porous plant cellulose fiber with carboxyl groups modified on the surface of the porous plant cellulose fiber, and the functional layer is C3N5.

[0011] The magnetic resin comprises a resin matrix and magnetic nanoparticles uniformly dispersed in the resin matrix. The resin matrix is ​​benzo-melamine-formaldehyde resin, in which sulfonic acid groups are bonded to the benzene ring. The magnetic nanoparticles are nano-Fe3O4.

[0012] Preferably, the specific surface area of ​​the piezoelectric catalytic material is 80 m². 2 / g~150m 2 / g, with the thickness of the functional layer ranging from 50nm to 200nm.

[0013] Preferably, the sulfonation degree of the phenyl melamine-formaldehyde resin is 15%~35%;

[0014] Preferably, the phenyl melamine-formaldehyde resin has a hierarchical porous structure comprising micropores of 2 nm to 5 nm and mesopores of 5 nm to 20 nm.

[0015] Preferably, the particle size of nano-Fe3O4 is 10nm~50nm;

[0016] Preferably, the specific surface area of ​​the phenyl melamine-formaldehyde resin is 150 m². 2 / g~450m 2 / g, the acidity of the magnetic resin is 2.5mmol / g~4.5mmol / g;

[0017] Preferably, the saturation magnetization of the magnetic resin is 15 emu / g to 35 emu / g.

[0018] Preferably, the concentration of the treatment agent is 0.1 g / L to 5 g / L.

[0019] Preferably, ultrasonic cavitation includes an alternating high-frequency initiation phase and a low-frequency deepening phase. The frequency of the high-frequency initiation phase is 40kHz~60kHz, and the duration of the high-frequency initiation phase is 30min. The frequency of the low-frequency deepening phase is 20kHz~40kHz, and the duration of the low-frequency deepening phase is 60min~90min.

[0020] Furthermore, the aeration rate of the spiral aeration system is 0.1 m³ / s. 3 / min~1m 3 / min, the bubble diameter of spiral aeration is 50μm~500μm.

[0021] Furthermore, after the treatment agent undergoes mixing reaction and filtration, the reacted treatment agent is obtained. The reacted treatment agent is then regenerated to obtain the regenerated treatment agent.

[0022] When the treatment agent is a piezoelectric catalyst, the regeneration process includes the following steps:

[0023] Pickling, first drying, second drying, first microwave treatment;

[0024] Pickling is performed using a citric acid solution with a pH of 3.0–5.0 at a flow rate of 1 m / s. 3 / h~2m 3 / h, pickling time is 5min~10min;

[0025] The temperature for the first drying step is 60℃, and the drying time is 5 minutes.

[0026] The second drying temperature is 80℃, and the second drying time is 10 minutes;

[0027] The microwave power of the first microwave treatment is 800W~1200W, the microwave frequency of the first microwave treatment is 2.45GHz, the duration of the first microwave treatment is 2min, the number of times the first microwave treatment is performed is 3, the interval between two adjacent first microwave treatments is 1min, and the first microwave treatment is performed in a nitrogen atmosphere.

[0028] When the treatment agent is magnetic resin, the regeneration process includes the following steps:

[0029] First cleaning, second cleaning, second microwave treatment;

[0030] The first cleaning is performed using a citric acid solution with a pH of 2.0 to 3.0, and the cleaning time is 3 to 8 minutes.

[0031] The second cleaning is performed using a mixed solution of organic acid / alcohol with a pH of 4.0-5.0, and the first cleaning time is 5-10 minutes.

[0032] The microwave power of the second microwave process is 800W~1200W, the microwave frequency of the second microwave process is 2.45GHz, and the time of the second microwave process is 5min~15min.

[0033] A second aspect of the present invention provides a system for implementing the above-described mechanocatalytic treatment method for wastewater and contaminated groundwater, comprising:

[0034] The main body of the wastewater treatment system includes a shell, within which an open reaction tank is formed. The reaction tank is used for mixing and reaction, and is equipped with an ultrasonic cavitation mechanism and a spiral aeration mechanism.

[0035] The inlet pipe is connected to the sewage source at its inlet end and to the reaction tank at its outlet end. A first valve is installed between the inlet pipe and the reaction tank.

[0036] The dosing mechanism is used to add the treatment agent to the wastewater to be treated in the reaction tank.

[0037] The outlet pipe is connected to the reaction tank at its inlet end and is used to discharge the treated wastewater. A water pump is installed on the outlet pipe.

[0038] The filtration mechanism includes a filter membrane, which is disposed between the outlet pipe and the reaction tank;

[0039] The collection mechanism has its input end connected to the reaction tank. The collection mechanism is used to collect the treatment agent after the reaction. A second valve is provided between the collection mechanism and the reaction tank.

[0040] Furthermore, the dosing mechanism includes a mixing tank, a nozzle, and a real-time monitoring module. The nozzle faces the opening of the reaction tank, and the mixing tank is connected to the input end of the nozzle. The mixing tank is used to premix the treatment agent with water or a pH buffer solution.

[0041] Furthermore, the collection mechanism includes an electromagnetic scraper and a negative pressure suction pipe. The electromagnetic scraper is movably disposed at the bottom of the reaction tank, the input end of the negative pressure suction pipe is connected to the bottom of the reaction tank, and a second valve is disposed between the negative pressure suction pipe and the reaction tank.

[0042] The beneficial effects of this invention are as follows: This invention utilizes the synergistic effect of ultrasonic cavitation and specific treatment agents. The piezoelectric catalytic material, designed with an in-situ grown C3N5 functional layer on a porous plant cellulose fiber carrier, can efficiently generate catalytically active substances in situ under ultrasonic cavitation, thereby specifically degrading recalcitrant organic matter. The magnetic resin, relying on the sulfonic acid groups on the benzo-melamine-formaldehyde resin matrix and the combination of nano-Fe3O4, can both target and adsorb cationic pollutants and assist in the catalytic generation of degradation-active substances. No chemical agents need to be added during wastewater treatment, avoiding secondary pollution. It effectively treats complex water bodies while reducing operating costs, demonstrating excellent environmental friendliness and practicality. Attached Figure Description

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0044] Figure 1 This is a schematic diagram of the structure of a system for implementing a mechanical catalytic treatment method for wastewater and contaminated groundwater in one embodiment;

[0045] Figure 2 TEM image of the piezoelectric catalytic material prepared in Example 1;

[0046] Figure 3 The image shows the FTIR spectrum of the piezoelectric catalytic material prepared in Example 1.

[0047] Figure 4 The piezoelectric catalytic material prepared in Example 1 1 H NMR MAS spectra;

[0048] Figure 5 The FTIR spectrum of the magnetic resin prepared in Example 2;

[0049] Figure 6 Hysteresis loop diagram of the magnetic resin prepared in Example 2;

[0050] Figure 7 This is a diagram showing the recycling effect of the magnetic resin after the regeneration process in Example 2.

[0051] In the attached diagram: 1-Inlet pipe; 2-Reaction tank; 3-Nozzle; 4-Filter membrane; 5-Electromagnetic scraper; 6-Mixing tank; 7-Outlet pipe; 8-First valve; 9-Water pump. Detailed Implementation

[0052] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the description of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0053] Traditional physical adsorption methods have limitations such as difficulty in adsorbent regeneration, chemical oxidation methods are prone to secondary pollution, biological treatment methods are not effective in treating recalcitrant organic matter, and single ultrasonic treatment has low energy utilization.

[0054] This embodiment provides a mechanical catalytic treatment method for wastewater and contaminated groundwater, including the following steps:

[0055] Add the treatment agent to the wastewater to be treated, mix and react, filter, and the wastewater treatment is completed.

[0056] The treatment agent includes at least one of piezoelectric catalytic materials and magnetic resins;

[0057] When the treatment agent is a piezoelectric catalyst, the mixing reaction is carried out under ultrasonic cavitation conditions;

[0058] When the treatment agent is a magnetic resin, the mixing reaction is carried out under ultrasonic cavitation and / or spiral aeration conditions;

[0059] The piezoelectric catalytic material includes a support and a functional layer grown in situ on the surface of the support. The support is a porous plant cellulose fiber with carboxyl groups modified on the surface of the porous plant cellulose fiber, and the functional layer is C3N5.

[0060] The magnetic resin comprises a resin matrix and magnetic nanoparticles uniformly dispersed in the resin matrix. The resin matrix is ​​benzo-melamine-formaldehyde resin, in which sulfonic acid groups are bonded to the benzene ring. The magnetic nanoparticles are nano-Fe3O4.

[0061] The mechanical catalytic treatment method for wastewater and contaminated groundwater provided in this embodiment preferably involves treating wastewater containing high concentrations of antibiotics. A treatment agent is added to the wastewater, and the mixture reacts under ultrasonic cavitation and / or spiral aeration conditions, depending on the specific agent used. The wastewater is then filtered to complete the treatment. When the high concentration of antibiotics in the wastewater is relatively uniform, either piezoelectric catalytic materials or magnetic resins can be used. When the high concentration of antibiotics in the wastewater is complex, both piezoelectric catalytic materials and magnetic resins can be added together.

[0062] The preparation of piezoelectric catalytic materials includes the following steps:

[0063] (1) Carboxylation pretreatment: The porous plant cellulose fiber is immersed in 3%~10% NaOH solution and heated at 60℃~90℃ for 0.5h~2h to complete the alkaline washing to remove surface impurities; the alkaline washed porous plant cellulose fiber is immersed in 5%~15% citric acid solution and reacted at 60℃~90℃ for 1h~3h to obtain carboxylated porous plant cellulose fiber;

[0064] (2) In-situ thermal polymerization loading: Carboxylated plant cellulose fibers are impregnated in 0.1M~1.0M 3-amino-1,2,4-triazole aqueous solution, ultrasonically dispersed for 10min~60min, dried and placed in an inert atmosphere (N2 or Ar); heated to 160℃~200℃ at a heating rate of 2°C / min~10°C / min, and thermally polymerized at a constant temperature for 2-4 hours, so that C3N5 grows in situ on the surface of carboxylated porous plant cellulose fibers to obtain piezoelectric catalytic materials.

[0065] The piezoelectric catalytic material's core structural design combines a porous support with an in-situ grown functional layer. It utilizes porous plant cellulose fibers as the support, pre-treating them to introduce carboxyl groups onto their surface. These carboxyl groups enhance the hydrophilicity of the fibers, making the support easier to disperse in wastewater, while also increasing the fibers' chemical activity. Crucially, they provide stable anchoring points for the subsequent in-situ growth of the functional layer (C3N5), ensuring a tight bond between C3N5 and the porous plant cellulose fibers. C3N5, a narrow-bandgap carbon nitride material, possesses a unique electronic structure and abundant active nitrogen sites, endowing it with excellent photogenerated carrier separation efficiency and visible light response. The piezoelectric catalytic material combines the porous network structure of plant cellulose fibers with the photocatalytic activity of C3N5. The three-dimensional interconnected pores of the porous plant cellulose fibers promote reactant mass transfer and increase the exposure of active sites, while C3N5 effectively suppresses photogenerated electron-hole recombination through a heterogeneous interface formed by π-π conjugation and hydrogen bonding. Porous plant cellulose fibers form a stable heterostructure through chemical bonding between carboxyl groups and the C3N5 precursor. During the thermal polymerization process, the carboxyl groups undergo dehydration condensation with the amino groups of 3-amino-1,2,4-triazole to form amide bonds. This strong interfacial coupling significantly improves carrier migration efficiency and prevents C3N5 from falling off.

[0066] Under ultrasonic cavitation, piezoelectric catalytic materials utilize the piezoelectric effect induced by mechanical stress to complete the in-situ generation of H2O2 and the degradation of pollutants (antibiotic molecules). When ultrasonic cavitation is applied to the wastewater to be treated, the generated periodic mechanical stress acts on the functional layer (C3N5) in the piezoelectric catalytic material, causing regular lattice distortion of C3N5, thereby forming a piezoelectric potential field (polarization intensity ≥ 0.5 C / m) inside the piezoelectric catalytic material. 2 The piezoelectric potential field can serve as a driving force for charge separation, causing electrons to migrate to and accumulate on the surface of the piezoelectric catalytic material, while holes migrate to the bulk phase of the piezoelectric catalytic material. Electrons accumulated on the surface of the piezoelectric catalytic material reduce dissolved oxygen through two electron pathways, as shown in equation (1):

[0067] O2 + 2H + +2e − →H2O2 (1)

[0068] Simultaneously, the cavitation oxidation of water molecules generates hydroxyl radicals (·OH); the generated H2O2 and ·OH jointly attack pollutants (antibiotic molecules), achieving mineralization through ring-opening reactions and defluorination.

[0069] Preferably, the porous plant cellulose fiber is one of porous cotton fiber, porous hemp fiber, or porous bamboo fiber.

[0070] The preparation of the magnetic resin includes the following steps:

[0071] (1) Synthesis of sulfonated benzoyl melamine-formaldehyde resin: Benzyl melamine, formaldehyde and distilled water are mixed in a mass ratio of 1:(2~4):(10~20); the pH is adjusted to 8.0~9.5 with alkaline solution, and the mixture is heated to 75℃~85℃ for 1h~2h; sulfonating reagent is added, the pH is adjusted to 3.5~5.0, and the reaction is continued for 2h~4h; the mixture is filtered, washed and dried to obtain sulfonated benzoyl melamine-formaldehyde resin;

[0072] (2) Preparation of magnetic composite material: sulfonated benzoyl melamine-formaldehyde resin and Fe3O4 nanoparticles were mixed at a mass ratio of (5~15):1; refluxed in ethanol-water mixed solvent at 60℃~90℃ for 3h~6h; stirred at room temperature for 8h~16h to fully composite the resin, and then magnetically separated, washed and dried to obtain magnetic resin.

[0073] The magnetic resin uses melamine-formaldehyde resin as the resin matrix. Melamine-formaldehyde resin itself possesses good structural stability and abundant pore structure, providing ample space for the adsorption of pollutants (antibiotic molecules). To improve the adsorption selectivity and capacity of melamine-formaldehyde resin for pollutants (antibiotic molecules), the resin is directionally modified by bonding sulfonic acid groups to its benzene ring. The strong polarity of the sulfonic acid groups enhances its hydrophilicity and dispersibility in wastewater, preventing resin agglomeration and wasted adsorption sites. Furthermore, hydrogen bonding and coordination facilitate the uniform dispersion of subsequent magnetic particles (nano-Fe3O4) in the resin matrix. The uniform dispersion of magnetic particles (nano-Fe3O4) in the resin matrix avoids the problem of reduced catalytic sites caused by magnetic particle agglomeration in traditional magnetic adsorption materials. Overall, the magnetic resin integrates the high adsorption capacity of resin, the selective adsorption of sulfonic acid groups, and the catalytic degradation capability of nano-Fe3O4 particles.

[0074] The sulfonic acid groups bonded to the resin matrix (phenyl melamine-formaldehyde resin) of the magnetic resin are negatively charged in water, and can form stable bonds with cationic pollutants (antibiotic molecules) through electrostatic attraction. Under the action of ultrasonic cavitation and / or spiral aeration, the catalytic activity of uniformly dispersed nano-Fe3O4 in the magnetic resin is significantly enhanced, promoting the redox cycle of iron ions of different valence states on the surface of nano-Fe3O4. The low-valence iron ions on its surface can react with H2O2 generated by dissolved oxygen in the water (or H2O2 generated by piezoelectric catalytic materials) to generate hydroxyl radicals (·OH), which then attack pollutants (antibiotic molecules).

[0075] Preferably, when the treatment agent is a magnetic resin, the mixing reaction is carried out under spiral aeration conditions.

[0076] Preferably, the specific surface area of ​​the piezoelectric catalytic material is 80 m². 2 / g~150m 2 / g, with the thickness of the functional layer ranging from 50nm to 200nm.

[0077] Preferably, the sulfonation degree of the phenyl melamine-formaldehyde resin is 15%~35%;

[0078] Preferably, the phenyl melamine-formaldehyde resin has a hierarchical porous structure comprising micropores of 2 nm to 5 nm and mesopores of 5 nm to 20 nm.

[0079] Preferably, the particle size of nano-Fe3O4 is 10nm~50nm;

[0080] Preferably, the specific surface area of ​​the phenyl melamine-formaldehyde resin is 150 m². 2 / g~450m 2 / g, the acidity of the magnetic resin is 2.5mmol / g~4.5mmol / g;

[0081] Preferably, the saturation magnetization of the magnetic resin is 15 emu / g to 35 emu / g.

[0082] Preferably, the concentration of the treatment agent is 0.1 g / L to 5 g / L.

[0083] Preferably, ultrasonic cavitation includes an alternating high-frequency initiation phase and a low-frequency deepening phase. The frequency of the high-frequency initiation phase is 40kHz~60kHz, and the duration of the high-frequency initiation phase is 30min. The frequency of the low-frequency deepening phase is 20kHz~40kHz, and the duration of the low-frequency deepening phase is 60min~90min.

[0084] Furthermore, the aeration rate of the spiral aeration system is 0.1 m³ / s. 3 / min~1m 3 / min, the bubble diameter of spiral aeration is 50μm~500μm.

[0085] Furthermore, after the treatment agent undergoes mixing reaction and filtration, the reacted treatment agent is obtained. The reacted treatment agent is then regenerated to obtain the regenerated treatment agent.

[0086] When the treatment agent is a piezoelectric catalyst, the regeneration process includes the following steps:

[0087] Pickling, first drying, second drying, first microwave treatment;

[0088] Pickling is performed using a citric acid solution with a pH of 3.0–5.0 at a flow rate of 1 m / s. 3 / h~2m 3 / h, pickling time is 5min~10min;

[0089] The temperature for the first drying step is 60℃, and the drying time is 5 minutes.

[0090] The second drying temperature is 80℃, and the second drying time is 10 minutes;

[0091] The microwave power of the first microwave treatment is 800W~1200W, the microwave frequency of the first microwave treatment is 2.45GHz, the duration of the first microwave treatment is 2min, the number of times the first microwave treatment is performed is 3, the interval between two adjacent first microwave treatments is 1min, and the first microwave treatment is performed in a nitrogen atmosphere.

[0092] The regeneration process of piezoelectric catalytic materials begins with acid washing with a mild acid solution to dissolve inorganic scale on the surface of the piezoelectric catalytic material and in its porous channels, thereby destroying weak adsorption and removing residual pollutants. Then, the material undergoes two-step drying (first removing free water, then removing bound water) to ensure a moisture content of ≤5%. Finally, a first microwave treatment is performed to repair C3N5 lattice distortion, remove stubborn organic matter, and restore the piezoelectric properties and catalytic activity of the material.

[0093] When the treatment agent is magnetic resin, the regeneration process includes the following steps:

[0094] First cleaning, second cleaning, second microwave treatment;

[0095] The first cleaning is performed using a citric acid solution with a pH of 2.0 to 3.0, and the cleaning time is 3 to 8 minutes.

[0096] The second cleaning is performed using a mixed solution of organic acid / alcohol with a pH of 4.0-5.0, and the first cleaning time is 5-10 minutes.

[0097] The microwave power of the second microwave process is 800W~1200W, the microwave frequency of the second microwave process is 2.45GHz, and the time of the second microwave process is 5min~15min.

[0098] The regeneration process of the magnetic resin involves a first cleaning to remove inorganic deposits from the porous structure and clear the mass transfer channels; a second cleaning to restore the adsorption activity of sulfonic acid groups through ion exchange or desorption; and finally, a second microwave treatment to destroy the strong adsorption effect, remove residual pollutants, disperse Fe3O4 agglomerates, and restore the adsorption and catalytic performance of the magnetic resin.

[0099] like Figure 1 As shown, this embodiment also provides a system for implementing the above-described mechanical catalytic treatment method for wastewater and contaminated groundwater, comprising:

[0100] The main body of the sewage treatment includes a shell, and a reaction tank 2 with an open opening is formed inside the shell. The opening faces upward. The reaction tank 2 is used for mixing and reaction. The reaction tank 2 is equipped with an ultrasonic cavitation mechanism and a spiral aeration mechanism.

[0101] Water inlet pipe 1, the inlet end of water inlet pipe 1 is connected to the sewage source, the outlet end of water inlet pipe 1 is connected to the reaction tank 2, and a first valve 8 is provided between water inlet pipe 1 and reaction tank 2;

[0102] The dosing mechanism is used to add the treatment agent to the wastewater to be treated in reaction tank 2.

[0103] The water outlet pipe 7 is connected to the reaction tank 2 at its inlet end. The water outlet pipe 7 is used to discharge the water that has been treated for sewage. A water pump 9 is installed on the water outlet pipe 7.

[0104] The filtration mechanism includes a filter membrane 4, which is disposed between the water outlet pipe 7 and the reaction tank 2.

[0105] The collection mechanism has its input end connected to the reaction tank 2. The collection mechanism is used to collect the treatment agent after the reaction. A second valve is provided between the collection mechanism and the reaction tank 2.

[0106] It should be noted that the system treats wastewater intermittently. During wastewater treatment, the second valve is closed, and the first valve 8 is opened to allow wastewater to flow into the reaction tank 2 through the inlet pipe 1. Then, the first valve 8 is closed, and the ultrasonic cavitation mechanism and / or spiral aeration mechanism are activated to create ultrasonic cavitation and / or spiral aeration conditions in the reaction tank 2. Treatment agent is then added to the wastewater to be treated in the reaction tank 2 through the dosing mechanism for mixing and reaction. At this time, due to the resistance of the filter membrane 4 itself, the water in the reaction tank 2 will not spontaneously pass through the filter membrane 4. After the mixing reaction is completed, the water pump 9 on the outlet pipe 7 is activated to drive the treated wastewater back onto the filter membrane 4 and discharge it through the outlet pipe 7, thus completing the wastewater treatment. After multiple batches of wastewater treatment are completed, the second valve is opened, and the treated agent after reaction is collected by the collection mechanism. The treated agent undergoes external regeneration treatment and is then recycled back into the dosing mechanism.

[0107] Furthermore, the dosing mechanism includes a mixing tank 6, a nozzle 3, and a real-time monitoring module. The nozzle 3 is located above the opening of the reaction tank 2 and faces the opening of the reaction tank 2. The mixing tank 6 is connected to the input end of the nozzle 3. The mixing tank 6 is used to premix the treatment agent with water or pH buffer solution.

[0108] The mixing speed of the premixing agent with water or pH buffer solution in the mixing tank 6 is 200 rpm to 500 rpm, and the time is 10 min to 30 min; the orifice diameter of the nozzle 3 is 0.5 mm to 2 mm, the spraying pressure of the nozzle 3 is 0.2 MPa to 0.5 MPa, and the spraying coverage of the nozzle 3 is more than 80% of the horizontal projected area of ​​the reaction tank 2.

[0109] Furthermore, the collection mechanism includes an electromagnetic scraper 5 and a negative pressure suction pipe. The electromagnetic scraper 5 is movably disposed at the bottom of the reaction tank 2, the input end of the negative pressure suction pipe is connected to the bottom of the reaction tank 2, and a second valve is disposed between the negative pressure suction pipe and the reaction tank 2.

[0110] Among them, the magnetic field strength of the electromagnetic scraper 5 is 0.3T~0.8T; the diameter of the negative pressure suction tube is 25mm~80mm, the vacuum degree of the negative pressure suction tube is -0.05MPa~-0.1MPa, and the flow rate of the negative pressure suction tube is 8m / s~15m / s.

[0111] Furthermore, the spiral aeration mechanism of the reaction tank 2 includes a spiral rising aeration pipe, the input end of which is connected to an external air source, and the output end of which is connected to the reaction tank 2.

[0112] The aeration orifice diameter of the spiral rising aeration pipe is 0.1mm~0.5mm.

[0113] Example 1

[0114] Example 1: The wastewater to be treated is the drainage from the circulating water system of an aquaculture farm. The aquaculture wastewater mainly contains uneaten feed, feces, dissolved organic matter (such as protein and fat), ammonia nitrogen, nitrite and a small amount of antibiotics (such as enrofloxacin).

[0115] Wastewater and contaminated groundwater are treated using the aforementioned mechanical catalytic treatment method and system, including the following steps:

[0116] Open the first valve, and the wastewater to be treated is introduced into the reaction tank through the inlet pipe. Close the first valve, start the ultrasonic cavitation mechanism to form ultrasonic cavitation conditions, and then add piezoelectric catalytic material (the concentration of piezoelectric catalytic material is 0.3 g / L) into the reaction tank through the dosing mechanism to carry out the mixing reaction.

[0117] After the mixing reaction is complete, start the water pump on the outlet pipe and pass the water through a filter membrane (an ultrafiltration membrane with a pore size of 0.1 μm and a membrane flux of 80 L / (m²)). 2 The filtration process (with a backwashing cycle of 1.5 hours) separates the treated wastewater from the reacted piezoelectric catalyst. The treated wastewater is then filtered through the membrane and discharged through the outlet pipe.

[0118] After treating four batches of wastewater, the second valve is opened, and the filter residue is sucked and collected through the negative pressure suction pipe to obtain the piezoelectric catalytic material after reaction and transported to the outside for regeneration treatment. The piezoelectric catalytic material after reaction is acid washed, dried in the first stage, dried in the second stage, and microwave treated in the first stage to complete the regeneration treatment.

[0119] The ultrasonic cavitation process includes an alternating high-frequency initiation phase and a low-frequency deepening phase. The high-frequency initiation phase has a frequency of 60 kHz and a duration of 30 min. The low-frequency deepening phase has a frequency of 20 kHz and a duration of 60 min.

[0120] In the dosing mechanism, the mixing tank premixes the piezoelectric catalyst with water (the concentration of the piezoelectric catalyst in the premix is ​​1 g / L), the premixing speed is 200 rpm, and the time is 15 min; the nozzle orifice diameter is 1 mm, the nozzle spray pressure is 0.3 MPa, and the nozzle spray coverage is more than 80% of the horizontal projected area of ​​the reaction tank.

[0121] The negative pressure suction tube has a diameter of 50mm, a vacuum degree of -0.1MPa, and a flow rate of 10m / s.

[0122] The pickling process uses a citric acid solution with a pH of 4.0, and the pickling flow rate is 1 m / s. 3 The pickling time is 10 min; the first drying temperature is 60℃ and the first drying time is 5 min; the second drying temperature is 80℃ and the second drying time is 10 min; both the first and second drying are carried out under vacuum conditions; the microwave power of the first microwave treatment is 1000W, the microwave frequency of the first microwave treatment is 2.45GHz, the first microwave treatment time is 2 min, the first microwave treatment is performed 3 times, and the interval between two adjacent first microwave treatments is 1 min; the first microwave treatment is carried out under a nitrogen atmosphere.

[0123] The preparation of piezoelectric catalytic materials includes the following steps:

[0124] (1) Carboxylation pretreatment: The porous cotton fiber was soaked in 5% NaOH solution and heated at 90℃ for 1h to complete the alkaline washing to remove surface impurities; the alkaline washed porous cotton fiber was soaked in 10% citric acid solution and reacted at 80℃ for 2h to obtain carboxylated porous cotton fiber.

[0125] (2) In-situ thermal polymerization loading: Carboxylated cotton fibers were impregnated in 1.0M 3-amino-1,2,4-triazole aqueous solution, ultrasonically dispersed for 50 min, dried and placed in an inert atmosphere N2; heated to 180℃ at a heating rate of 10°C / min, and thermally polymerized at a constant temperature for 3 hours, so that C3N5 grew in situ on the surface of carboxylated porous cotton fibers to obtain piezoelectric catalyst material.

[0126] The specific surface area of ​​the piezoelectric catalytic material in Example 1 is 100 m². 2 / g, the thickness of the functional layer (C3N5) is 100nm.

[0127] TEM image of the piezoelectric catalytic material prepared in Example 1 is shown below. Figure 2 As shown, the FTIR plot is as follows Figure 3 As shown (in addition to the piezoelectric catalytic material prepared in Example 1, porous cotton fiber, C3N5, and porous cotton fiber / C3N5 obtained by physical mixing were also characterized by FTIR. Porous cotton fiber is denoted as Cotton, porous cotton fiber / C3N5 obtained by physical mixing is denoted as Cotton / C3N5, and the piezoelectric catalytic material prepared in Example 1 is denoted as Cotton-C3N5). 1 HNMR MAS spectra, such as Figure 4 As shown (in addition to the piezoelectric catalytic material prepared in Example 1, porous cotton fiber, C3N5, and porous cotton fiber / C3N5 obtained by physical mixing were also tested), 1 HNMRMAS characterization, porous cotton fiber is denoted as Cotton, porous cotton fiber / C3N5 obtained by physical mixing is denoted as Cotton / C3N5, and piezoelectric catalytic material prepared in Example 1 is denoted as Cotton-C3N5).

[0128] refer to Figure 3 FTIR at 3400cm -1 The broad peaks nearby correspond to OH stretching vibrations, indicating the presence of hydroxyl groups or adsorbed water in the piezoelectric catalytic material. However, the peak shape is slightly broader than that of porous cotton fibers, suggesting that the introduction of C3N5 may interact with the porous cotton fibers through hydrogen bonding. (1700 cm⁻¹) -1 The intensity of the C=O carbonyl peak at 1600 cm⁻¹ decreases, while the intensity at 1600 cm⁻¹ decreases. -1 The significantly enhanced C=C / C=N vibrational peaks in the vicinity indicate that the carbon nitride structure (such as CN bonds) of C3N5 is coupled with the carbon skeleton of porous cotton fibers. A magnified view shows that Cotton-C3N5 exhibits strong coupling in the CN bond region (~1200~1600 cm⁻¹). -1 The peak position of ) shifted by 9 cm compared to C3N5. -1 (Δδ=9cm) -1 This further confirms the chemical bonding or electron transfer between the two.

[0129] refer to Figure 4 of 1 In the 1H NMR MAS spectra of the four samples, Cotton-C3N5 exhibited the strongest C-OH proton signal at 3.5 ppm, significantly higher than C3N5 (almost no signal) and Cotton / C3N5. This phenomenon suggests that the composite process of porous cotton fibers with C3N5 not only preserves the hydroxyl groups on the surface of the porous cotton fibers, but may also further promote the exposure or stabilization of hydroxyl groups through chemical bonding or interfacial interactions (such as hydrogen bonding or covalent linkage).

[0130] The single wastewater treatment effect in Example 1 is shown in Table 1.

[0131] Table 1. Wastewater treatment effect of a certain aquaculture farm in Example 1

[0132]

[0133] The recycling performance of the piezoelectric catalytic material pair that underwent regeneration treatment in Example 1 was tested, and the test results are shown in Table 2.

[0134] Table 2. Recyclability Test Table of Piezoelectric Catalytic Materials After Regeneration Treatment

[0135]

[0136] Example 2

[0137] Example 1: The wastewater to be treated was wastewater from a pharmaceutical factory, and the main antibiotic in the wastewater was sulfamethoxazole.

[0138] Wastewater treatment using the above-mentioned mechanical catalytic treatment method and system for wastewater and contaminated groundwater includes the following steps:

[0139] Open the first valve, and the wastewater to be treated is introduced into the reaction tank through the inlet pipe. Close the first valve, start the spiral aeration mechanism to form spiral aeration conditions, and then add magnetic resin (the concentration of magnetic resin is 2g / L) into the reaction tank through the dosing mechanism to carry out the mixing reaction.

[0140] After the mixing reaction is complete, start the water pump on the outlet pipe and pass the water through a filter membrane (an ultrafiltration membrane with a pore size of 0.1 μm and a membrane flux of 80 L / (m²)). 2 The filtration process (with a backwashing cycle of 1.5 hours) separates the treated wastewater from the reacted magnetic resin. The treated wastewater then passes through the filter membrane and is discharged through the outlet pipe.

[0141] After treating five batches of wastewater, the magnetic resin is adsorbed by the magnetic field of the electromagnetic scraper and the second valve is opened. The filter residue is collected through the negative pressure suction pipe to obtain the reacted magnetic resin, which is then transported to the outside for regeneration. The reacted magnetic resin undergoes a first cleaning, a second cleaning, and a second microwave treatment to complete the regeneration process.

[0142] The aeration rate of the spiral aeration system is 0.5 m³ / s. 3 / min, the bubble diameter of the spiral aeration is 50μm, and the aeration orifice diameter is 0.5mm.

[0143] In the dosing mechanism, the mixing tank premixes the magnetic resin with water (the concentration of the magnetic resin in the premix is ​​20g / L), the premixing speed is 300rpm, and the time is 25min; the nozzle orifice diameter is 1mm, the nozzle spraying pressure is 0.3MPa, and the nozzle spraying coverage is more than 80% of the horizontal projected area of ​​the reaction tank.

[0144] The electromagnetic scraper has a magnetic field strength of 0.5T, the negative pressure suction tube has a diameter of 25mm, the vacuum degree of the negative pressure suction tube is -0.1MPa, and the flow rate of the negative pressure suction tube is 10m / s.

[0145] The first cleaning was performed using a citric acid solution with a pH of 3.0 for 5 minutes; the second cleaning was performed using a mixed organic acid / alcohol solution with a pH of 4.0 for 8 minutes; the second microwave treatment had a microwave power of 900W, a microwave frequency of 2.45GHz, and a treatment time of 10 minutes.

[0146] The preparation of the magnetic resin includes the following steps:

[0147] (1) Synthesis of sulfonated benzoyl melamine-formaldehyde resin: Benzyl melamine, formaldehyde and distilled water were mixed in a mass ratio of 1:3:15; the pH was adjusted to 9.5 with an alkaline solution and heated to 85°C for 2 h; a sulfonating agent was added, the pH was adjusted to 3.5 and the reaction was continued for 4 h; the mixture was filtered, washed and dried to obtain sulfonated benzoyl melamine-formaldehyde resin;

[0148] (2) Preparation of magnetic composite material: Sulfonated benzoyl melamine-formaldehyde resin and Fe3O4 nanoparticles were mixed at a mass ratio of 10:1; refluxed at 60°C for 3 h in ethanol-water mixed solvent; stirred at room temperature for 16 h to fully composite the resin; and then magnetically separated, washed and dried to obtain magnetic resin.

[0149] In Example 2, the sulfonation degree of the benzotriamine-formaldehyde resin in the magnetic resin was 25%; the benzotriamine-formaldehyde resin had a hierarchical porous structure including micropores of 3 nm and mesopores of 12 nm; the particle size of the nano-Fe3O4 was 28 nm; and the specific surface area of ​​the benzotriamine-formaldehyde resin was 380 m². 2 / g, the acidity of the magnetic resin is 3.8mmol / g; the saturation magnetization of the magnetic resin is 25emu / g.

[0150] The FTIR spectrum of the magnetic resin prepared in Example 2 is shown below. Figure 5 As shown, the hysteresis loop diagram is as follows: Figure 6 As shown.

[0151] refer to Figure 5 The FTIR plot shows a depth of 1180~1200 cm. -1 The strong, broad peak (S=O stretching vibration) at 1040~1060 cm⁻¹ is a key indicator of the presence of sulfonic acid groups (-SO₃H), and its broad, blunt peak shape indicates hydrogen bonding between the sulfonic acid groups; -1 The strong sharp peak (SO vibration) at 1180 cm⁻¹ needs to be related to the 1180 cm⁻¹ peak. -1 The coexistence of peaks confirms the integrity of the -SO3H structure. Furthermore, the 3400~3300 cm⁻¹ peaks... -1 The intensity of the broad peak (-OH / -NH- stretching vibration) at that point is moderate.

[0152] refer to Figure 6 The hysteresis loop plot shows that the magnetic resin exhibits typical superparamagnetic characteristics, with an "S"-shaped magnetization curve that passes through zero. The saturation magnetization is 20 emu / g, and there is no coercivity or remanence. This indicates that the Fe3O4 nanoparticles retain their rapid magnetic response capability even after being effectively encapsulated by the sulfonated resin.

[0153] The single wastewater treatment effect in Example 2 is shown in Table 3.

[0154] Table 3. Wastewater treatment effect of a pharmaceutical factory in Example 2.

[0155]

[0156] The recycling performance of the regenerated magnetic resin in Example 2 was tested, and the test results are shown in Table 4. The recycling effect of the regenerated magnetic resin is illustrated in the following diagram. Figure 7 As shown, for reference Figure 7 It can be seen that after ten cycles of regeneration, the resin material can still achieve a good effect in degrading antibiotics, with a degradation rate of over 95%.

[0157] Table 4. Recycling Performance Test Table of Magnetic Resin After Regeneration Treatment

[0158]

[0159] Example 3

[0160] Example 3: The wastewater to be treated was groundwater from the soil near a pig farm.

[0161] Wastewater treatment using the above-mentioned mechanical catalytic treatment method and system for wastewater and contaminated groundwater includes the following steps:

[0162] Open the first valve, and the wastewater to be treated is introduced into the reaction tank through the inlet pipe. Close the first valve, start the ultrasonic cavitation mechanism to form ultrasonic cavitation conditions, and then add piezoelectric catalytic material (the concentration of piezoelectric catalytic material is 0.5 g / L) and magnetic resin (the concentration of magnetic resin is 2 g / L) into the reaction tank through the dosing mechanism to carry out the mixing reaction.

[0163] After the mixing reaction is complete, the mixture is passed through a filter membrane (an ultrafiltration membrane with a pore size of 0.1 μm and a membrane flux of 80 L / (m²)). 2 The filtration process (with a backwashing cycle of 1.5 hours) separates the treated wastewater from the piezoelectric catalytic material and the magnetic resin after the reaction. The treated wastewater is then filtered through the membrane and discharged through the outlet pipe.

[0164] After treating five batches of wastewater, the magnetic filter residue is first adsorbed by the magnetic field of an electromagnetic scraper, and the second valve is opened. The magnetic filter residue is collected through a negative pressure suction pipe to obtain the reacted magnetic resin, which is then transported to the outside for regeneration. The reacted magnetic resin undergoes a first cleaning, a second cleaning, and a second microwave treatment. Next, the remaining filter residue is collected through a negative pressure suction pipe to obtain the reacted piezoelectric catalyst material, which is then transported to the outside for regeneration. The reacted piezoelectric catalyst material undergoes acid washing, a first drying, a second drying, and a first microwave treatment.

[0165] The ultrasonic cavitation process includes an alternating high-frequency initiation phase and a low-frequency deepening phase. The high-frequency initiation phase has a frequency of 50 kHz and a duration of 30 min. The low-frequency deepening phase has a frequency of 30 kHz and a duration of 80 min.

[0166] In the dosing mechanism, the piezoelectric catalyst material is first premixed with water in a mixing tank (the concentration of the piezoelectric catalyst material in the premix is ​​1 g / L), the premixing speed is 200 rpm, and the time is 15 min; the nozzle orifice diameter is 1 mm, the nozzle spray pressure is 0.3 MPa, and the nozzle spray coverage is more than 80% of the horizontal projected area of ​​the reaction tank; then, the magnetic resin is premixed with water in the mixing tank (the concentration of the magnetic resin in the premix is ​​5 g / L), the premixing speed is 400 rpm, and the time is 25 min; the nozzle orifice diameter is 2 mm, the nozzle spray pressure is 0.4 MPa, and the nozzle spray coverage is more than 80% of the horizontal projected area of ​​the reaction tank.

[0167] The electromagnetic scraper has a magnetic field strength of 0.8T, a vacuum degree of -0.08MPa, a pipe diameter of 25mm, and a suction velocity of 10m / s.

[0168] The pickling process uses a citric acid solution with a pH of 3.0, and the pickling flow rate is 2 m / s. 3 The pickling time is 8 min; the first drying temperature is 60℃ and the first drying time is 5 min; the second drying temperature is 80℃ and the second drying time is 10 min; both the first and second drying are carried out under vacuum conditions; the microwave power of the first microwave treatment is 900W, the microwave frequency of the first microwave treatment is 2.45GHz, the first microwave treatment time is 2 min, the first microwave treatment is performed 3 times, and the interval between two adjacent first microwave treatments is 1 min; the first microwave treatment is carried out under a nitrogen atmosphere.

[0169] The first cleaning was performed using a citric acid solution with a pH of 3.0 for 5 minutes; the second cleaning was performed using a mixed organic acid / alcohol solution with a pH of 4.0 for 8 minutes; the second microwave treatment had a microwave power of 900W, a microwave frequency of 2.45GHz, and a treatment time of 10 minutes.

[0170] The preparation of the piezoelectric catalytic material was the same as in Example 1, and the preparation of the magnetic resin was the same as in Example 2.

[0171] The single wastewater treatment effect in Example 3 is shown in Table 5.

[0172] Table 5. Effect of wastewater treatment in pig farm in Example 1

[0173]

[0174] Comparative Example 1

[0175] Comparative Example 1 uses the traditional activated sludge process (aerobic aeration tank) to treat polluted groundwater from a pig farm. The hydraulic retention time (HRT) is 3 h, the sludge concentration (MLSS) is 3000 mg / L, the aeration method is microporous aeration (air-to-water ratio of 5:1), the temperature is 25°C (mesothermal conditions), and the pH is 7.0–7.5. The wastewater treatment effect is shown in Table 6.

[0176] Table 6. Treatment efficacy of traditional activated sludge process on contaminated groundwater from a pig farm.

[0177]

[0178] Referring to the data in Table 6, it is evident that antibiotics (oxytetracycline, chlortetracycline) are difficult for microorganisms to degrade, resulting in low removal rates; heavy metals (Cr...) 6+ Pb 2+ It may be partially adsorbed or precipitated, but it is difficult to remove completely; COD can be partially degraded, but difficult-to-degrade organic matter remains; turbidity can be partially reduced through precipitation.

[0179] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention.

Claims

1. A method for the mechano-catalytic treatment of sewage or contaminated ground water, characterized in that, The method comprises the following steps: adding a treatment agent into sewage or contaminated groundwater to be treated, mixing and reacting, filtering, and completing the treatment; the treatment agent comprises a piezocatalytic material and a magnetic resin; the mixing and reacting is performed under the condition of ultrasonic cavitation; the piezocatalytic material comprises a carrier and a functional layer grown in situ on the surface of the carrier, the carrier is a porous plant cellulose fiber, the surface of the porous plant cellulose fiber is modified with carboxyl groups, and the functional layer is C3N5; the magnetic resin comprises a resin matrix and magnetic nanoparticles uniformly dispersed in the resin matrix, the resin matrix is a benzoguanamine-formaldehyde resin, the benzene ring of the benzoguanamine-formaldehyde resin is bonded with sulfonic acid groups, and the magnetic nanoparticles are nano Fe3O4.

2. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 1, characterized in that, The specific surface area of the piezocatalytic material is 80 m 2 / g~150 m 2 / g, and the thickness of the functional layer is 50 nm~200 nm.

3. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 1, characterized in that, The sulfonation degree of the benzoguanamine-formaldehyde resin is 15% to 35%; and / or, the benzoguanamine-formaldehyde resin has a hierarchical porous structure comprising micropores of 2 nm to 5 nm and mesopores of 5 nm to 20 nm; and / or, the particle size of the nano Fe3O4 is 10 nm to 50 nm; and / or, the specific surface area of the phenylated melamine-formaldehyde resin is 150 m 2 / g ~ 450 m 2 / g, the acid amount of the magnetic resin is 2.5 mmol / g ~ 4.5 mmol / g; and / or, the saturation magnetization of the magnetic resin is 15 emu / g to 35 emu / g.

4. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 1, characterized in that, The concentration of the treatment agent is 0.1 g / L to 5 g / L.

5. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 1, characterized in that, The ultrasonic cavitation comprises an alternating high-frequency starting stage and a low-frequency deepening stage, the frequency of the high-frequency starting stage is 40 kHz to 60 kHz, and the time of the high-frequency starting stage is 30 min; the frequency of the low-frequency deepening stage is 20 kHz to 40 kHz, and the time of the low-frequency deepening stage is 60 min to 90 min.

6. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 1, characterized in that, After the mixing and reacting and the filtering of the treatment agent, a reacted treatment agent is obtained, and the reacted treatment agent is subjected to a regeneration treatment to obtain a regenerated treatment agent; when the treatment agent is the piezocatalytic material, the regeneration treatment comprises the following steps: pickling, first drying, second drying, and first microwave treatment; The pickling is performed using a citric acid solution with a pH value of 3.0-5.0, the flow rate of the pickling is 1 m 3 / h~2 m 3 / h, and the pickling time is 5 min-10 min. the temperature of the first drying is 60°C, and the time of the first drying is 5 min; the temperature of the second drying is 80°C, and the time of the second drying is 10 min; the microwave power of the first microwave treatment is 800 W to 1200 W, the microwave frequency of the first microwave treatment is 2.45 GHz, the time of the first microwave treatment is 2 min, the number of times of the first microwave treatment is 3, the interval between adjacent two times of the first microwave treatment is 1 min, and the first microwave treatment is performed under a nitrogen atmosphere; when the treatment agent is the magnetic resin, the regeneration treatment comprises the following steps: first washing, second washing, and second microwave treatment; the first washing is performed using a citric acid solution with a pH value of 2.0 to 3.0, and the time of the first washing is 3 min to 8 min; the second washing is performed using an organic acid / alcohol mixed solution with a pH value of 4.0 to 5.0, and the time of the second washing is 5 min to 10 min; The microwave power of the second microwave treatment is 800-1200 W, the microwave frequency of the second microwave treatment is 2.45 GHz, and the time of the second microwave treatment is 5-15 min.

7. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 6, characterized in that, The mechanical force catalytic treatment method for sewage or contaminated groundwater comprises the following steps: a sewage treatment main body comprising a shell, an open reaction tank formed in the shell, and an ultrasonic cavitation mechanism and a spiral aeration mechanism in the reaction tank; a water inlet pipe, a water outlet pipe, a filter mechanism, and a collection mechanism. The water inlet pipe is connected to a sewage source or a contaminated groundwater source, and the water outlet pipe is connected to the reaction tank. The filter mechanism comprises a filter membrane arranged between the water outlet pipe and the reaction tank. The collection mechanism is connected to the reaction tank and comprises an electromagnetic scraper and a negative pressure suction pipe. The collection mechanism is connected to the reaction tank and comprises an electromagnetic scraper and a negative pressure suction pipe.

8. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 7, characterized in that, The collection mechanism is connected to the reaction tank and comprises an electromagnetic scraper and a negative pressure suction pipe.

9. The method of mechanical force catalytic treatment of sewage or contaminated groundwater according to claim 7, characterized in that, ​

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