Electromagnetic reinforced vacuum filtration solid-liquid separation device

Abstract

The application discloses a kind of electromagnetic reinforced vacuum filtration solid-liquid separation device, it includes power supply, air pump, support, water pump, filter barrel, electromagnetic coil, air pipe, water outlet pipe, receiving box;Receiving box is set in the lower portion of support, several filter barrels are set on support and located above receiving box, electromagnetic coil surrounds around several filter barrels, filter barrel, electromagnetic coil is connected with power supply respectively by electric wire, water pump is communicated with the water outlet that is set in the bottom of filter barrel by pipeline, branch pipe I, the water outlet of water pump is connected with water outlet pipe;The air outlet of filter barrel top is communicated with air pump by branch pipe II, air pipe;The device structure design is compact, operation and maintenance are simple, and different processing scale and water quality condition can be flexibly adapted by increasing or reducing the number of filter barrel or adjusting air pump power.The overall system has the characteristics of high degree of automation, low energy consumption, low maintenance cost, etc., not only helps to realize the resource utilization and standard discharge of aquaculture wastewater, but also provides reliable technical equipment for agricultural non-point source pollution control, with significant environmental, economic and social benefits.

Description

Technical Field

[0001] This invention relates to an electromagnetically enhanced vacuum filtration solid-liquid separation device, belonging to the field of wastewater treatment technology. Background Technology

[0002] Solid-liquid separation is a common technical process in process industries such as chemical, environmental protection, food, pharmaceutical, and mining. Its essence lies in the efficient and economical separation of the solid and liquid phases in a suspension. With increasingly stringent emission standards and product quality requirements, various sectors are demanding differentiated separation precision, throughput, and energy consumption: municipal sludge requires a moisture content of ≤60% to reduce subsequent incineration or landfill volume; oilfield sludge needs to reduce residual oil content to 0.3% to meet both reinjection and environmental protection standards; in the synthesis of lithium-ion battery cathode materials, nano-sized particles must avoid metal contamination and have a moisture content of <10% to ensure electrochemical performance; fermentation and pharmaceutical processes require CIP / SIP functionality to prevent cross-contamination from microbial fragments; and mineral processing tailings require a solid content of ≥65% after dewatering to achieve dry stacking and water recycling. However, existing plate and frame separators, screw presses, belt separators, centrifuges, and membrane separators generally suffer from drawbacks such as easy filter cloth clogging, short continuous operating cycles, high energy consumption, and poor adaptability to different particle sizes and concentrations, making it difficult to achieve both high separation factor and high throughput in a single unit. Therefore, developing a compact, online regenerable, adaptable to a wide particle size range, and low-energy solid-liquid separation device has become a common demand for cross-industry upgrades.

[0003] Solid-liquid separation is a key unit common to process industries, directly impacting product quality, energy consumption, and emission indicators in more than ten fields, including municipal wastewater, mining tailings, chemical crystallization, food fermentation, pharmaceutical extraction, lithium battery materials, and livestock farming. Different industries have varying requirements for separation precision, processing scale, and operating environment: municipal sludge requires a moisture content ≤60% to reduce incineration volume; mineral processing requires a bottom solids content ≥65% for dry stacking; lithium battery cathode materials need to avoid metal contamination and have a moisture content <10% to ensure electrochemical performance; while livestock farm wastewater contains both high solids content (3-8%) and high COD (5000-15000 mg·L⁻¹). -1 Due to the characteristics of fiber-metal mixtures, traditional screens fail within 30 minutes due to the dense filter cake caused by fibers and metals, resulting in backwash water consumption as high as 25% of the produced water. Furthermore, heavy metals entering the anaerobic zone inhibit methanogenic bacteria activity. This device, through electromagnetic enhancement and dual-pump counter-flushing coupling, extends the continuous operating cycle of the filter screen from ≤0.5 days to ≥7 days, with a solids content of ≤0.3% in the produced water and a power consumption of ≤0.12 kWh per ton of water, only 1 / 5 that of a screw extruder. It provides a compact, low-consumption, and maintenance-free common technology platform for complex solid-liquid separation across industries, and has universal value for promoting agricultural non-point source pollution control, clean production in mining, and upgrading urban wastewater treatment.

[0004] While existing domestic and international technologies demonstrate outstanding performance in their respective scenarios, they all reveal significant shortcomings: the Dutch Huber RoFAS® rotary drum screen relies on high-pressure backflushing, requiring manual removal of entangled fibers upon shutdown; its retention rate for metal particles smaller than 0.2mm is less than 40%, and backflushing water accounts for 18-30% of the production water, making it prone to freezing and failure in winter; the Chinese CN112233 twin-screw extruder operates at Cl⁻>2000 mg·L⁻. -1 Pitting corrosion appeared in the manure within 48 hours, and metal foreign objects abraded the blades, shortening the maintenance cycle to 60 days and increasing annual costs to over 12,000 yuan. While the American BAKER-RULLMAN 3D dehydration system, using an 80kW hot air furnace, could reduce moisture content to 10%, the equipment was 8m tall, energy-intensive, and posed a secondary explosion risk due to metal oxide dust. In summary, none of the above solutions could simultaneously meet the stringent requirements of farms for fiber-metal coexistence, zero backwash water, low energy consumption, and small footprint. This cross-industry pain point led to the novel "electromagnetic enhancement-dual-pump counter-flushing" approach of this device: online capture and release of metal impurities using a programmable electromagnetic field, micro-disturbance to loosen fiber bridges, continuous drainage using a counter-flushing flow field instead of high-pressure backspray, and large drums instead of modular tanks, achieving a drainage depth of ≤1m. 2 The system completes solid-liquid separation within its premises, achieving "7×24 h, 0.12 kWh per ton of water, and filter screens that do not require disassembly and cleaning," filling a technological gap in the front-end treatment of complex wastewater containing high fiber and high metal content both domestically and internationally.

[0005] However, the aforementioned devices all focus on their respective single operating conditions: RoFAS cannot handle fiber entanglement and fine metal particles, the double-helix extrusion system has a short lifespan in a high-chloride ion environment, and the 3D system is difficult to directly process low-concentration watery feces due to high energy consumption and large volume. What they all lack is a systematic solution for "achieving long-cycle, low-energy separation under conditions of fiber-metal coexistence, limited space, and zero backwash water constraints." Addressing this cross-industry pain point, this device proposes an electromagnetic enhancement-dual-pump counter-flushing coupling approach: using a programmable electromagnetic field to capture metal online and slightly perturb loosened fibers, replacing high-pressure backflow with a counter-flushing flow field, and replacing large rollers with modular barrels, thereby achieving separation within ≤1m... 2 The project has achieved a breakthrough in "7×24 h continuous operation, zero backwash water, and 0.12 kWh per ton of water" within its site, filling the gap in the field of low-consumption solid-liquid separation of complex wastewater with high fiber and high metal content both domestically and internationally. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of the prior art and provide an electromagnetically enhanced vacuum filtration solid-liquid separation device. This device achieves efficient, continuous and low-maintenance solid-liquid separation of complex wastewater with high salt content (such as solid-liquid mixtures of livestock and poultry manure, municipal sludge, and mining tailings) by means of an adjustable electric field, magnetic field and dual-pump synergistic vacuum filtration system.

[0007] The electromagnetic enhanced vacuum filtration solid-liquid separation device of the present invention includes a power supply, an air pump, a support frame, a water pump, filter barrels, an electromagnetic coil, an air extraction pipe, a water outlet pipe, and a receiving box. The receiving box is located at the lower part of the support frame, and several filter barrels are arranged on the support frame and located above the receiving box. The electromagnetic coil surrounds several filter barrels. The filter barrels and the electromagnetic coil are respectively connected to the power supply through wires. The water pump is connected to the water outlet located at the bottom of the filter barrel through a pipe and a branch pipe I. The water outlet of the water pump is connected to the water outlet pipe. The air outlet at the top of the filter barrel is connected to the air pump through a branch pipe II and an air extraction pipe. The filter units are permeable cylindrical pipe units arranged in the sewage tank. Their outer walls are tightly covered with high-mesh, corrosion-resistant metal filter screens, which are installed in parallel arrays. During operation, a negative pressure pump creates a stable negative pressure inside the pipes via an extraction pipe. This forces the high-solids-content sewage outside the filter units to pass through the filter screen from the outside in under the action of the transmembrane pressure difference. Solid particles are trapped on the outside of the filter screen, while the clarified liquid enters the filter units. The clarified liquid entering each filter unit is then collected through an outlet pipe located at the lower end of the pipeline and continuously extracted by a pump, thus achieving a solid-liquid separation process of continuous sewage intake and continuous purified water discharge. The cylindrical filter cartridges are made of 316L stainless steel, 304 stainless steel, or titanium alloy, with a wall thickness of 0.8-2.0 mm. The mesh size of the filter screen is adjustable from 800-15000 mesh. The filter screen material is a corrosion-resistant woven metal mesh with an opening rate ≥35% and an air permeability of 2000-5000 L / (m²). 2 The filter cartridges adopt a standardized modular design and can be arranged in 2×4, 3×4, or 4×5 arrays. The number can be increased or decreased as needed within the range of 8-20 cartridges, and they are connected in parallel via quick-clamp connectors. The electromagnetic coil is wound with copper, aluminum, or copper-clad aluminum composite wire with a wire diameter of 0.8-1.5mm. Each filter cartridge has 150-250 turns, a coil resistance of 8-15 Ω, and a coil spacing of 10-20 mm. It is connected to a 2-36V DC or low-frequency AC power supply, and the output current density is 0.5-3.0A / dm³. 2 Power range: 200-800W. The vacuum pump used is a vortex vacuum pump or a Roots vacuum pump, with a rated flow rate of 0.2-0.5 m³ / h. 3 / min, ultimate vacuum degree -0.03MPa~-0.05MPa, motor power 0.75-2.2kW, operates in conjunction with a water pump, the latter being a pneumatic diaphragm pump (QBY type, flow rate 0.25-0.6 m³ / min) selected according to the object being treated. 3 / min, pressure 0.04-0.06 MPa), wear-resistant slurry pump (ZJQ type, flow rate 0.6-1.0 m³ / min) or food-grade screw pump (G type, flow rate 0.2-0.35 m³ / min) 3 ( / min), creating a transmembrane pressure difference of 0.07-0.11 MPa across the filter cake.

[0008] The flow sensor uses an electromagnetic or vortex flow meter with a measuring range of 0.1-1.0m. 3 / h, accuracy ±1.5%FS, output 4-20mA signal to the electrical control box.

[0009] When using the above device, place the support in a pool containing the solid-liquid mixture to be treated, with the liquid level of the mixture located at 2 / 3 of the outer side of the filter barrel. First, turn on the air pump and turn off the water pump. The air pump creates a negative pressure of -0.03 to -0.05 MPa inside the filter barrel and continues until the water volume inside the filter barrel is 2 / 3 of the total volume. Then, turn off the air pump and simultaneously turn on the water pump to drain the filtered water from the filter barrel. Repeat this process, with the air pump and water pump running alternately, to achieve solid-liquid separation, with the solid adsorbed on the wall of the filter barrel. When the filtration flux drops to 70%-80% of the initial value, turn off the air pump and water pump, and inject a pulsed airflow with a pressure of 0.05-0.08 MPa for 3-10 seconds into the filter barrel through the air extraction pipe. This causes the filter residue adsorbed on the filter barrel to fall off to the top of the receiving box. After cleaning, repeat the above solid-liquid separation process.

[0010] The process operating parameters of this device are as follows: power supply voltage 2-36VDC, adaptively adjusted according to wastewater viscosity and particle characteristics; suitable for wastewater conductivity range of 2000-15000 μS / cm; when conductivity <2000 μS / cm, 0.1-0.5% NaCl electrolyte can be added to the solid-liquid mixture; current density controlled at 0.8-2.5 A / dm³. 2 After power is applied, the filter screen experiences a Joule heating temperature rise of ≤5℃ (actual monitoring ≤3.8℃), which has no negative impact on the treatment effect. Simultaneously, the high-voltage electric field generates active oxygen (·OH, O3, etc.) at a concentration of 0.5-2.0 mg / L in the water, achieving simultaneous oxidation and disinfection. Experiments show that, using the aforementioned power supply, wastewater, and at least an 800-mesh filter, this device can treat complex wastewater with suspended solids concentrations of 500-10000 mg / L and particle sizes of 0.5-500 μm. It maintains a retention rate of over 99% for systems with -0.074 mm (74 μm) fine particles accounting for ≥70%, and a removal rate of ≥99% for entangled impurities such as cellulose, hair, and feathers with lengths of 5-50 mm and diameters of 10-100 μm. The adsorption rate for paramagnetic metal particles (5-100 μm in diameter) such as Fe, Cu, and Zn is ≥85%. The device can be operated in a dual-pump 24-hour continuous operation mode (processing capacity 0.5-2.0 m³ / h). 3The system operates in either a continuous flow rate ( / h) or intermittent mode (1.5-2.0 hours of operation + 3-5 minutes of shutdown) for high-fiber wastewater. When the flow rate drops to 70-80% of the initial value, an automatic gas backflushing process is initiated to remove the filter cake. The backflushing pressure is 0.05-0.08 MPa, the backflushing medium is compressed air or nitrogen, and each flush lasts 5-10 seconds, achieving a filter cake removal rate ≥95%. The device is immersed to a depth of 2 / 3-3 / 4 of the filter cartridge height. The system operates at a vacuum level of -0.03 MPa to -0.05 MPa, with a vacuum fluctuation rate ≤5%. Power consumption per ton of water is 0.08-0.12 kWh. The suspended solids (SS) removal rate is 98.5-99.9%, the effluent SS concentration is ≤200 mg / L, the effective working cycle of the filter screen is ≥7 days, the moisture content of the formed filter cake is ≤75%, and the thickness uniformity is ±10%.

[0011] The advantages and technical effects of this invention are as follows: First, the electric field generated by a safe voltage of 2-36V and the magnetic field of 18-30mT work together to change the zeta potential on the particle surface, causing the suspended colloid to become unstable and aggregate. The magnetic field exerts a 6.8×10⁻⁶ Ω·cm on the paramagnetic particles. -3 N / m 3 The filter uses a magnetic field to capture metallic impurities online and gently loosen the fiber bridge, reducing the filter screen pore blockage rate by more than 85% and extending the continuous operation cycle to 14 times that of traditional screens (≥7 days). Secondly, the dual-pump counter-current flow field creates a transmembrane pressure difference of 0.07-0.11 MPa on both sides of the filter cake, increasing the flux by 3-5 times compared to simple gravity filtration. Simultaneously, negative pressure suction promotes the loosening of the filter cake structure, while positive pressure discharge accelerates filtrate stripping, forming a virtuous cycle of "rapid cake formation - efficient dehydration." Thirdly, the Joule heat generated by the electrically powered filter (temperature rise ≤5℃) reduces wastewater viscosity (η from 1.2 mPa·s to 0.9 mPa·s), increasing the filtration rate. The active oxygen free radicals generated by the electric field (·OH yield 1.2 mg / L·min) can break organic molecular chains, achieving simultaneous COD degradation (removal rate ≥75%) and sterilization (E. coli removal rate 99.8%), forming a synergistic effect of "physical separation - chemical oxidation." Fourth, an array of 8-20 filter barrels can be used depending on the processing scale (0.5-2.0m). 3The system offers flexible expansion capabilities (with a flow rate of ±1.5%). A flow sensor monitors the flux in real-time, automatically triggering 0.05-0.08 MPa gas backflushing when the flow rate drops to 70% of its initial value. The sludge cake removal rate is ≥95%, enabling unattended operation. The electrical control box integrates a PID algorithm, adaptively adjusting voltage (24-48 V) and pump speed based on the influent SS concentration (500-10000 mg / L), optimizing power consumption to 0.08-0.12 kWh per ton of water. Finally, this device can treat complex wastewater with conductivity of 2000-15000 μS / cm, SS concentration of 5-185 g / L, and particle size of 0.5-500 μm. It achieves separation efficiencies of over 98.5% for municipal sludge, mining tailings, food wastewater, and livestock manure, providing a compact (≤1.5 m²) solution for cross-industry solid-liquid separation. 2 This common technology platform, characterized by low energy consumption and maintenance-free operation, has universal value in promoting agricultural non-point source pollution control, clean production in mining, and upgrading and transforming urban sewage systems.

[0012] 1. Electromagnetic anti-clogging and enhanced separation: The magnetic field generated by the electromagnetic coil can attract or disturb the paramagnetic and ferromagnetic fine particles in the sewage, change their movement trajectory, reduce their bridging and clogging at the filter screen pores, and promote the aggregation of fine particles, thereby improving filtration accuracy and efficiency and significantly extending the effective working time of the filter screen. This electromagnetic field can directionally migrate fine metal impurities mixed in with sewage, causing them to collide and settle freely. Simultaneously, it prevents fibrous suspended matter from adhering to the filter screen through micro-perturbation, thus significantly improving filtration efficiency and extending the filter screen cleaning cycle. During operation, a pump on one side generates negative pressure, connected to a vacuum extraction pipe at the bottom of each metal filter cartridge, drawing in sewage from around the metal filter cartridge. In this process, solid-liquid separation and purification are completed through the interaction of the metal filter screen and electromagnetic enhancement. A pump on the other side connects to a water extraction pipe at the top of each filter cartridge, extracting and discharging the filtered clean water, forming a continuous and efficient solid-liquid separation process.

[0013] 2. Pneumatic Coordination, High-Efficiency Process: Utilizing a pump-driven mode that combines inlet air disturbance with outlet water suction, the system avoids the slow filtration speed issues associated with relying solely on liquid level differences, achieving rapid solid-liquid separation and circulation. The inlet air disturbance provides an online, low-intensity self-cleaning effect.

[0014] 3. Modular structure and intelligent monitoring: The device has a compact structure, and the core filtration unit can be expanded in parallel. Real-time monitoring of the produced water flow rate is achieved through a flow sensor, and the electronic control system can intelligently determine the degree of filter clogging and issue warnings, facilitating planned maintenance and reducing manual inspection costs.

[0015] 4. By adjusting parameters such as air pump power and electromagnetic field strength, it can flexibly handle water-soaked manure of different concentrations and compositions, and is suitable for various types of farms such as pigs, cattle, and poultry. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the device structure of the present invention; Figure 2 This is a schematic diagram of an electromagnetic coil structure; Figure 3 This is a schematic diagram of a metal filter barrel. In the diagram: 1-Power supply, 2-Air pump, 3-Bracket, 4-Water pump, 5-Filter canister, 6-Electromagnetic coil, 7-Alligator clip, 8-Air extraction pipe, 9-Water outlet pipe, 10-Receiver box. Detailed Implementation

[0017] The following examples further illustrate the content of the present invention, but these examples do not limit the scope of protection of the present invention. Unless otherwise specified, the methods in the examples are conventional methods, and unless otherwise specified, the reagents used are conventional commercial reagents or reagents prepared according to conventional methods. Example 1: Thickening and Dewatering of Excess Sludge from Municipal Wastewater Treatment Plants In this embodiment, the above-mentioned device is applied to the pretreatment of residual sludge in the secondary sedimentation tank of a municipal sewage treatment plant in East China, aiming to verify its concentration effect on sludge with high water content and fine particles. like Figure 1-3 As shown, the electromagnetic enhanced vacuum filtration solid-liquid separation device includes a power supply 1, an air pump 2, a support 3, a water pump 4, filter barrels 5, an electromagnetic coil 6, an air extraction pipe 8, a water outlet pipe 9, and a receiving box 10. The receiving box 10 is located at the lower part of the support, and several filter barrels 5 are placed on the support and above the receiving box 10. The electromagnetic coil 6 surrounds several filter barrels 5. The filter barrels 5 are connected to the power supply 1 through wires, and the electromagnetic coil 6 is connected to the power supply 1 through wires and alligator clips 7. The water pump 4 is connected to the water outlet at the bottom of the filter barrel 5 through a pipe and a branch pipe I. The water outlet of the water pump 4 is connected to the water outlet pipe 9. The air outlet at the top of the filter barrel 5 is connected to the air pump 2 through a branch pipe II and an air extraction pipe 8. The device support frame 1 is made of 316L stainless steel, with dimensions of 1.2 m × 1.0 m × 1.5 m. The filtration unit consists of 12 stainless steel filter barrels arranged in a 3×4 array and connected in parallel via quick-connect clamps. Each filter barrel is made of 3000-mesh (approximately 5 μm pore size) 316L stainless steel woven mesh, with a barrel wall thickness of 1.0 mm. An aluminum electromagnetic coil with a wire diameter of 1.0 mm, 150 turns, a coil resistance of approximately 8 Ω, and a coil spacing of 15 mm is tightly wound around the outer wall of each barrel. The electromagnetic coil is connected to an adjustable DC power supply; in this embodiment, the output voltage is set to 36 V DC, generating a pulsed magnetic field with a frequency of 5 Hz and a magnetic induction intensity of approximately 20 mT. The negative pressure vacuum pump 2 is a vortex vacuum pump with a rated flow rate of 0.3 m³ / h. 3 / min, ultimate vacuum degree -0.04MPa. Pump 4 is a corrosion-resistant pneumatic diaphragm pump with a flow rate of 0.35m³ / min. 3 / min, outlet pressure 0.05MPa. An electromagnetic flow sensor is installed on the outlet pipeline, and the signal is connected to the central electrical control box. Alligator clips are used for quick connection and disconnection of the electromagnetic coil and the power supply. Rated current 2A, contact resistance ≤0.01Ω.

[0018] When using the above device, place the support in a pool containing the solid-liquid mixture to be treated, with the liquid level of the mixture at 2 / 3 of the outer side of the filter barrel. First, turn on the air pump and turn off the water pump. The air pump creates a negative pressure of -0.04 MPa inside the filter barrel and continues until the water volume inside the filter barrel is 2 / 3 of the total volume. Then, turn off the air pump and simultaneously turn on the water pump to drain the filtered water from the filter barrel. Repeat this process, with the air pump and water pump running alternately, to achieve solid-liquid separation. The operating conditions and results are as follows: The treated material was residual sludge from the secondary sedimentation tank, with an initial moisture content of 99.2% (SS concentration approximately 8500 mg / L), pH value of 6.8, and temperature of 22℃. Power was turned on and both pumps were activated, and the system ran continuously for 12 hours. During operation, the control box automatically adjusted the pump speed based on flow feedback to maintain stable filtration. A negative pressure of -0.04 MPa was formed inside the filter tank, while the positive pressure outside the tank was 0.05 MPa, resulting in a transmembrane pressure difference of approximately 0.09 MPa. After treatment, the sludge moisture content decreased to 96.5% (SS concentration increased to approximately 35200 mg / L), and the sludge volume decreased by 71.2%. The filtrate SS concentration was 120 mg / L, and the turbidity removal rate was 98.6%, fully meeting the feed requirements for the subsequent plate and frame filter press. No dense sludge cake formed on the filter screen surface; only a small amount of sand particles were deposited at the bottom. Based on the flux decay model, the backwashing cycle was estimated to be up to 48 hours. The system consumes 0.08 kWh of electricity per ton of sludge, which is more than 65% more energy-efficient than traditional centrifugal concentration processes.

[0019] Solids are adsorbed onto the wall of the filter barrel. When the filtration flux drops to 70% of the initial value, the air pump and water pump are turned off, and a pulsed airflow with a pressure of 0.05 MPa and a duration of 5 seconds is injected into the filter barrel through the air extraction pipe. This causes the filter residue adsorbed on the filter barrel to fall off to the top of the receiving box. After cleaning, the above solid-liquid separation process is repeated.

[0020] Example 2: High-efficiency solid-liquid separation of tailings slurry in copper mine beneficiation plant This embodiment verifies the deep dewatering capability of the device of the present invention for tailings slurry with high solids content and weakly magnetic minerals. The device in this embodiment is the same as in Embodiment 1, except that the support frame is a corrosion-resistant carbon steel structure with dimensions of 1.5 m × 1.2 m × 1.6 m. The filtration unit consists of 20 stainless steel filter barrels arranged in a 4×5 array. The filter barrels use 5000-mesh (approximately 3 μm pore size) stainless steel screens, with copper-clad aluminum composite wire coils wound around the outside of the barrels. The wire diameter is 1.2 mm, with 250 turns, and the coil resistance is approximately 15 Ω. The power supply uses a 48 V DC output, generating a steady-state magnetic field with a magnetic induction intensity of approximately 30 mT for the directional adsorption of magnetic particles such as pyrrhotite. A Roots vacuum pump is used for the negative pressure pump, and a wear-resistant slurry pump is used for the positive pressure pump. The average pressure inside the filter barrels was measured to be -0.05 MPa, and the resulting transmembrane pressure difference was approximately 0.10 MPa. The system operated continuously for 12 hours. The device was installed in a tailings buffer tank with an immersion depth of 900 mm.

[0021] The operating conditions and results are as follows: The treated material was flotation tailings slurry with an initial solids content of 18.5% (SS concentration approximately 185,000 mg / L) and a 78% proportion of -0.074 mm fine particles. The system ran continuously for 24 hours, with a throughput consistently maintained at 1.8 m³. 3 / h. After treatment, the underflow solids content increased to 68.3%, the overflow SS concentration was 235 mg / L, and the solids recovery rate reached 99.9%. The electromagnetic field achieved an adsorption rate of over 85% for pyrrhotite particles with a particle size of 5-100 μm, effectively avoiding filter screen bridging and clogging caused by metal particles. The filter cake has a loose structure and can be efficiently removed through an online air blowing process. Compared with traditional thickening tank processes, this device significantly reduces the footprint while lowering energy consumption by 58%, and achieves fully continuous automated operation.

[0022] Example 3: Recovery of protein resources from corn starch processing wastewater This embodiment demonstrates the application of the present invention in food processing wastewater treatment and resource recycling, focusing on its efficiency in retaining and recovering heat-sensitive proteins.

[0023] The device in this embodiment is the same as in Embodiment 1, except that the support 1 is made of 304 stainless steel, and eight filter barrels 5 are arranged in a 2×4 array. The filter barrels use 4000-mesh titanium alloy screens to prevent protein denaturation on the metal surface. The electromagnetic coil uses high-temperature resistant enameled wire with a diameter of 0.8 mm, 180 turns, and a resistance of approximately 10 Ω. The power supply outputs 24 V DC, generating an alternating magnetic field with a frequency of 10 Hz and a magnetic induction intensity of approximately 18 mT to promote protein molecule aggregation. The air pump is a high-temperature resistant vacuum pump, and the water pump is a food-grade screw pump. The average pressure inside the filter unit was measured to be -0.03 MPa, and the resulting transmembrane pressure difference was approximately 0.08 MPa. The system operated continuously for 16 hours. The device was immersed in wastewater to a depth of 700 mm.

[0024] The operating conditions and results are as follows: The treated wastewater was corn starch soaking water with an SS concentration of 5600 mg / L, of which soluble protein accounted for 35%, and COD was 12800 mg / L, at a temperature of 55℃. After 6 hours of continuous operation, the SS concentration of the filtrate decreased to 98 mg / L, and the protein retention rate reached 96.2%. The collected filter cake had a protein content of 42% (dry basis) and could be directly used as a feed protein raw material. The COD of the filtrate decreased to 3200 mg / L, with a removal rate of 75%. Due to electromagnetic micro-perturbation, a dense protein gel layer did not form on the filter screen surface, and the cleaning cycle reached 36 hours. Compared with traditional air flotation processes, this device does not require the addition of reagents, consumes only 0.10 kWh of electricity per ton of water, and the value of the recovered protein products can offset the operating costs, resulting in significant economic benefits.

[0025] Example 4: Treatment of high-fiber manure from broiler farms This embodiment optimizes and verifies the characteristics of livestock farm manure having high fiber content and being prone to tangling.

[0026] The device in this embodiment is the same as in Embodiment 1, except that the support frame 1 is made of 304 stainless steel, and 16 filter barrels are arranged in a 4×4 array. The filter barrels are made of 4000-mesh stainless steel filter screen. Each barrel has a thickened copper coil wound around its outer wall, with a wire diameter of 1.5 mm, 220 turns, and a resistance of approximately 12 Ω. A 30 V DC power supply is connected to generate a high-frequency pulsed magnetic field with a frequency of 20 Hz and a magnetic induction intensity of approximately 25 mT to enhance the disturbance and untangling effect on the fibers. Air pumps and water pumps are selected according to the processing capacity. The average pressure inside the filter unit was measured to be -0.03 MPa, and the resulting transmembrane pressure difference was approximately 0.08 MPa. The system operated continuously for 16 hours. The device was immersed in the septic tank to a depth of 750 mm.

[0027] The operating conditions and results are as follows: The treated waterborne manure from a chicken farm had an initial suspended solids (SS) concentration of 13,800 mg / L and a crude fiber content of 40%. The system operated intermittently, stopping for 3 minutes every 1.5 hours. After 8 hours of continuous operation, the effluent SS concentration was 156 mg / L, achieving an SS removal rate of 98.9% and a fibrous impurity removal rate of 99.5%. No tangling or bridging occurred on the filter screen surface, only a loose filter cake formed. The number of E. coli in the effluent was significantly reduced, with a removal rate of 99.8%. The filter cleaning cycle was extended to 60 hours, and the power consumption per ton of water treated was 0.11 kWh. This device has a compact structure and small footprint, making it particularly suitable for space-constrained farm environments.

Claims

1. An electromagnetically enhanced vacuum filtration solid-liquid separation device, characterized in that: Includes a power supply (1), an air pump (2), a support (3), a water pump (4), a filter barrel (5), an electromagnetic coil (6), an air extraction pipe (8), a water outlet pipe (9), and a receiving box (10); the receiving box (10) is located at the bottom of the support, several filter barrels (5) are located on the support and above the receiving box (10), the electromagnetic coil (6) surrounds several filter barrels (5), the filter barrels (5) and the electromagnetic coil (6) are respectively connected to the power supply (1) through wires, the water pump (4) is connected to the water outlet at the bottom of the filter barrel (5) through pipes and branch pipe I, and the water outlet of the water pump (4) is connected to the water outlet pipe (9); the air outlet at the top of the filter barrel (5) is connected to the air pump (2) through branch pipe II and air extraction pipe (8); When using the above device, place the support in the pool containing the solid-liquid mixture to be treated, and the liquid level of the solid-liquid mixture is located at 2 / 3 of the outer side of the filter barrel (5); first turn on the air pump (2) and turn off the water pump (4). The air pump (2) generates a negative pressure of -0.03~-0.05MPa in the filter barrel (5) and continues until the water volume in the filter barrel is 2 / 3 of the filter barrel volume. Then turn off the air pump and turn on the water pump at the same time to discharge the filtered water in the filter barrel. Repeat this process, with the air pump (2) and the water pump (4) running alternately to achieve solid-liquid separation. The solid is adsorbed on the wall of the filter barrel. When the filtration flux drops to 70%-80% of the initial value, turn off the air pump (2) and the water pump (4). Inject a pulse airflow with a pressure of 0.05-0.08MPa and a duration of 3-10 seconds into the filter barrel through the air extraction pipe (8) to make the filter residue adsorbed on the filter barrel fall off to the top of the receiving box (10).

2. The electromagnetically enhanced vacuum filtration solid-liquid separation apparatus according to claim 1, characterized in that: The power supply (1) is a DC or low-frequency AC power supply.

3. The electromagnetically enhanced water-based solid-liquid separation device for feces according to claim 1, characterized in that: The filter screen of the filter barrel (5) is a high-mesh metal filter screen with a mesh size of 800-15000 mesh.

4. The electromagnetically enhanced water-based solid-liquid separation device for feces according to claim 1, characterized in that, It also includes a controller, which is connected to the air pump (2), the water pump (4), and the power supply (1) respectively, and is used to control the opening and closing of the components, the magnitude of the magnetic field and the electric field; the water outlet pipe (9) is equipped with a flow sensor, which is used to monitor the filtration flux and feed the signal back to the controller.

5. The electromagnetically enhanced water-based solid-liquid separation device for feces according to claim 1, characterized in that: The bracket (3) is an adjustable bracket.

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