Magnetic separation type three-phase dangerous wastewater separation treatment process and device

Abstract

The invention discloses a magnetic separation type three-phase dangerous wastewater separation treatment process and device, and the device comprises a wastewater tank, a two-stage magnetic separation assembly composed of a permanent magnet roller and a flat plate magnetic separator which are connected in series, and a magnetic seed recovery and regeneration assembly composed of a stainless steel vibrating screen and a small dry magnetic separator, a float flowmeter is arranged on the wastewater tank. The invention relates to the technical field of wastewater treatment. According to the magnetic separation type three-phase dangerous wastewater separation treatment process and device, through pretreatment strengthening and three-phase cooperative control, chemical demulsification and low-speed stirring are combined, emulsified pollutants are quickly destroyed, the pretreatment time is remarkably shortened, meanwhile, an inert gas aeration module is additionally arranged, dissolvable harmful gas is effectively removed, and the magnetic separation type three-phase dangerous wastewater separation treatment process and device are suitable for industrial production. The treatment blank of a traditional process on gas-phase pollutants is filled up, synchronous purification of solid-phase pollutants, liquid-phase pollutants and gas-phase pollutants is achieved, and secondary pollution is avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a magnetic separation-type three-phase hazardous wastewater separation and treatment process and apparatus. Background Technology

[0002] Three-phase hazardous wastewater contains solid, liquid, and gaseous hazardous substances, originating from industrial, medical, and other fields. It contains heavy metals, organic matter, and pathogens, and is highly toxic and difficult to treat. It requires comprehensive treatment technologies such as natural sedimentation and chemical oxidation to reduce environmental and health risks.

[0003] In existing technologies, magnetic separation three-phase hazardous wastewater separation and treatment processes mostly require pre-treatment through natural sedimentation or chemical precipitation, which requires a large area, has poor treatment effect on high-viscosity wastewater, and is prone to escaping magnetic seeds carrying pollutants into the effluent, leading to the risk of heavy metal exceeding the standard, which is detrimental to the treatment of three-phase hazardous wastewater. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a magnetic separation-type three-phase hazardous wastewater separation and treatment process and apparatus, which solves the problems of existing magnetic separation-type three-phase hazardous wastewater separation and treatment processes, which mostly require pre-treatment through natural sedimentation or chemical precipitation, resulting in poor treatment effects and easy escape of magnetic seeds carrying pollutants into the effluent.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a magnetic separation three-phase hazardous wastewater separation and treatment process, comprising the following operational steps:

[0006] S1. Wastewater pretreatment: After removing large particulate impurities from non-magnetic wastewater through a screen, polyacrylamide demulsifier is added and the wastewater is stirred at low speed.

[0007] S2. Hazardous gas treatment: Inert gas is introduced into the wastewater through the aeration components to transfer dissolved gases from the liquid phase to the gas phase. The gas is then extracted by the gas sampling hood and injected into the activated carbon adsorption tower for purification before being discharged.

[0008] S3. Intelligent magnetic seed addition: A screw feeder is added to the pipeline. The amount of magnetic seed added is controlled by adjusting the screw speed. A float flow meter is used to monitor the flow in real time. The wastewater is given magnetism. After adding the composite coagulant, high-speed stirring is used to achieve rapid combination of magnetic seed and pollutants in the wastewater.

[0009] S4, Two-stage magnetic separation system:

[0010] First-stage coarse separation: using a permanent magnet roller to separate large magnetic flocs;

[0011] Second-stage separation: A series flat-plate magnetic separator captures escaped fine particles, removes flocculent pollutants, and leaves clean water;

[0012] S5. Magnetic Seed Recovery: A stainless steel vibrating screen is used to separate magnetic seeds from large pieces of sludge, and the screened material is magnetic.

[0013] S6. Magnetic Seed Regeneration: Equipped with a small dry magnetic separator, the magnetic seeds under the screen are purified and recovered.

[0014] S7. Reuse of magnetic seeds: The screened magnetic seeds are fed back into S2 via a screw feeder to give the wastewater magnetism.

[0015] Furthermore, in step S2, a microporous aerator is used, and the inert gas is nitrogen.

[0016] Furthermore, in S4, an 800mT permanent magnet drum is connected in series with a 400mT flat magnetic separator.

[0017] Furthermore, in S5, an 80-mesh stainless steel vibrating screen is used.

[0018] Furthermore, in S6, the magnetic field strength of the small dry magnetic separator is 0.3T.

[0019] Furthermore, in S4, the flat magnetic separator is equipped with an automatic scraper and is cleaned every 2 hours.

[0020] Furthermore, in S4, the surface of the permanent magnet roller is coated with a Teflon coating.

[0021] A magnetic separation type three-phase hazardous wastewater separation and treatment device includes a wastewater tank, a two-stage magnetic separation assembly consisting of a permanent magnet drum and a flat magnetic separator connected in series, and a magnetic seed recovery and regeneration assembly consisting of a stainless steel vibrating screen and a small dry magnetic separator. The top of the wastewater tank's inner cavity is equipped with a stainless steel grid. A float flow meter is installed on the wastewater tank. A screw feeder is connected to the top of the side wall of the wastewater tank. A storage tank for storing magnetic seeds is located at the other end of the top of the screw feeder. A stirring device is installed at the bottom of the wastewater tank. The mixing component includes a dosing pipe connected to the side wall of the wastewater tank, an air sampling hood connected to the top of the wastewater tank, an aeration component installed at the bottom of the inner cavity of the wastewater tank, the input end of the aeration component located outside the wastewater tank, the bottom of the inner cavity of the wastewater tank connected to the inlet of the dual-stage magnetic separation component via a first connecting pipe, the outlet of the dual-stage magnetic separation component connected to the inlet of the magnetic seed recovery and regeneration component via a second connecting pipe, and the outlet of the magnetic seed recovery and regeneration component connected to the storage tank via a recovery pipe.

[0022] Furthermore, the top of the gas sampling hood is provided with a first flange pipe that communicates with the feed pipe of the activated carbon adsorption tower.

[0023] Furthermore, the top of the wastewater tank is provided with a second flange connection that communicates with an external wastewater discharge pipe.

[0024] Compared with existing technologies, the beneficial effects of this invention are as follows: through enhanced pretreatment and three-phase synergistic control, a combination of chemical demulsification and low-speed stirring is used to rapidly break down emulsified pollutants, significantly shortening the pretreatment time. Simultaneously, an inert gas aeration module is added to effectively remove dissolved harmful gases, filling the gap in traditional processes for treating gaseous pollutants and achieving simultaneous purification of solid, liquid, and gaseous pollutants, avoiding secondary pollution. The screw feeder and flow meter are linked for precise adjustment of the magnetic seed dosage, avoiding over- or under-dosing. Combined with a composite coagulant, the magnetic seed and pollutant binding is accelerated, significantly improving adsorption efficiency and magnetic seed recovery rate, forming a closed-loop circulation system. This reduces the need for fresh magnetic seed replenishment, lowering operating costs. The cascaded design of the two-stage magnetic separation system first coarsely separates large flocs and then finely captures fine particles, significantly improving separation accuracy, greatly reducing suspended solids in the effluent, and significantly enhancing water quality stability. The magnetic seed regeneration system achieves efficient purification and reuse of magnetic seeds, reducing hazardous waste generation and end-of-pipe disposal pressure. The overall process forms a resource internal cycle, combining environmental and economic benefits. Attached Figure Description

[0025] Figure 1 This is a flowchart of the magnetic separation three-phase hazardous wastewater separation and treatment process of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the magnetic separation type three-phase hazardous wastewater separation and treatment device of the present invention.

[0027] In the diagram: 1. Wastewater tank; 2. Second flange connection; 3. Dosing pipe; 4. Aeration assembly; 5. Mixing assembly; 6. Air sampling hood; 7. First flange connection; 8. Storage tank; 9. Screw feeder; 10. Two-stage magnetic separation assembly; 11. First connecting pipe; 12. Second connecting pipe; 13. Magnetic seed recovery and regeneration assembly; 14. Recovery pipe. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1 and Figure 2 This invention provides a technical solution: a magnetic separation three-phase hazardous wastewater separation and treatment process, comprising the following operating steps:

[0030] S1. Wastewater pretreatment: After removing large particulate impurities from non-magnetic wastewater through a screen, polyacrylamide demulsifier is added and the wastewater is stirred at low speed.

[0031] S2. Hazardous gas treatment: Inert gas is introduced into the wastewater through the aeration components to transfer dissolved gases from the liquid phase to the gas phase. The gas is then extracted by the gas sampling hood and injected into the activated carbon adsorption tower for purification before being discharged.

[0032] S3. Intelligent magnetic seed addition: A screw feeder is added to the pipeline. The amount of magnetic seed added is controlled by adjusting the screw speed. A float flow meter is used to monitor the flow in real time. The wastewater is given magnetism. After adding the composite coagulant, high-speed stirring is used to achieve rapid combination of magnetic seed and pollutants in the wastewater.

[0033] S4, Two-stage magnetic separation system:

[0034] First-stage coarse separation: using a permanent magnet roller to separate large magnetic flocs;

[0035] Second-stage separation: A series flat-plate magnetic separator captures escaped fine particles, removes flocculent pollutants, and leaves clean water;

[0036] S5. Magnetic Seed Recovery: A stainless steel vibrating screen is used to separate magnetic seeds from large pieces of sludge, and the screened material is magnetic.

[0037] S6. Magnetic Seed Regeneration: Equipped with a small dry magnetic separator, the magnetic seeds under the screen are purified and recovered.

[0038] S7. Reuse of magnetic seeds: The screened magnetic seeds are fed back into S2 via a screw feeder to give the wastewater magnetism.

[0039] In step S2, a microporous aerator is used, and the inert gas is nitrogen.

[0040] In S4, an 800mT permanent magnet drum is connected in series with a 400mT flat magnetic separator.

[0041] In S5, an 80-mesh stainless steel vibrating screen is used.

[0042] In S6, the magnetic field strength of the small dry magnetic separator is 0.3T.

[0043] In S4, the flat magnetic separator is equipped with an automatic scraper and is cleaned every 2 hours.

[0044] In S4, the surface of the permanent magnet roller is coated with a Teflon coating.

[0045] By enhancing pretreatment and implementing three-phase synergistic control, a combination of chemical demulsification and low-speed stirring is used to rapidly break down emulsified pollutants, significantly shortening the pretreatment time. At the same time, an inert gas aeration module is added to effectively remove dissolved harmful gases, filling the gap in the treatment of gaseous pollutants in traditional processes, achieving simultaneous purification of solid, liquid, and gaseous pollutants, and avoiding secondary pollution.

[0046] By linking the screw feeder with the flow meter, the magnetic seed dosage can be precisely adjusted to avoid over- or under-dosing. Combined with the composite coagulant, the magnetic seed and pollutants are accelerated to combine, significantly improving the adsorption efficiency and the magnetic seed recovery rate. This forms a closed-loop circulation system, reducing the amount of fresh magnetic seed replenishment and lowering operating costs. The cascaded design of the two-stage magnetic separation system first coarsely separates large flocs and then finely captures fine particles, significantly improving separation accuracy, greatly reducing suspended solids in the effluent, and significantly enhancing water quality stability.

[0047] The magnetic seed regeneration system enables efficient purification and reuse of magnetic seeds, reduces the amount of hazardous waste generated, lowers the pressure of end-of-life disposal, and forms an internal resource cycle, achieving both environmental and economic benefits.

[0048] A magnetic separation type three-phase hazardous wastewater separation and treatment device includes a wastewater tank 1, a two-stage magnetic separation component 10 consisting of a permanent magnet drum and a flat magnetic separator connected in series, and a magnetic seed recovery and regeneration component 13 consisting of a stainless steel vibrating screen and a small dry magnetic separator. The top of the inner cavity of the wastewater tank 1 is provided with a stainless steel grid, and a float flow meter is provided on the wastewater tank 1.

[0049] A screw feeder 9 is connected to the top of the side wall of the wastewater tank 1. A storage tank 8 for storing magnetic seeds is set at the other end of the top of the screw feeder 9. A mixing component 4 for stirring the inside of the wastewater tank 1 is set at the bottom of the wastewater tank 1. A dosing pipe 3 is connected to the side wall of the wastewater tank 1. An air sampling hood 6 is connected to the top of the wastewater tank 1. An aeration component 5 is set at the bottom of the inner cavity of the wastewater tank 1.

[0050] The input end of the aeration component 5 is located outside the wastewater tank 1. The bottom of the inner cavity of the wastewater tank 1 is connected to the inlet of the dual-stage magnetic separation component 10 through the first connecting pipe 11. The outlet of the dual-stage magnetic separation component 10 is connected to the inlet of the magnetic seed recovery and regeneration component 13 through the second connecting pipe 12. The outlet of the magnetic seed recovery and regeneration component 13 is connected to the storage tank 8 through the recovery pipe 14.

[0051] The top of the gas sampling hood 6 is equipped with a first flange pipe 7 that connects to the feed pipe of the activated carbon adsorption tower.

[0052] The top of the wastewater tank 1 is equipped with a second flange pipe 2 that connects to the external wastewater discharge pipe.

[0053] Hazardous wastewater containing three-phase pollutants enters wastewater tank 1 through the second flange connector 2. The wastewater first flows through the stainless steel grid at the top of the inner cavity to intercept large suspended solids and impurities, completing the initial solid-liquid separation.

[0054] The magnetic seeds in the storage tank 8 are quantitatively added to the wastewater tank 1 by the screw feeder 9. The amount added is monitored in real time by the float flow meter and the screw speed is adjusted accordingly to ensure that the magnetic seeds and wastewater are mixed in proportion.

[0055] Composite coagulant and polyacrylamide demulsifier are added to wastewater tank 1 through dosing pipe 3. Mixing component 4 promotes the rapid combination of magnetic seeds, agents and pollutants by low-speed stirring, destroys the stability of emulsified oil droplets and forms magnetic flocs.

[0056] Nitrogen gas is introduced into the bottom of the wastewater tank 1 through the aeration component 5, which forces dissolved volatile pollutants to transfer to the gas phase. The toxic gas is collected by the gas collection hood 6 and transported to the activated carbon adsorption tower for purification before being discharged through the first flange pipe 7.

[0057] The pretreated wastewater enters the two-stage magnetic separation assembly 10 through the first connecting pipe 11.

[0058] First-stage coarse separation: Wastewater flows through a permanent magnet drum, where large magnetic flocs are adsorbed and separated, achieving preliminary solid-liquid separation.

[0059] Second-stage separation: Unseparated fine particles enter a flat magnetic separator, where an automatic scraper cleans the surface every 2 hours to capture any escaped fine magnetic particles and ensure the cleanliness of the effluent.

[0060] The separated magnetic sludge enters the magnetic seed recovery and regeneration component 13 through the second connecting pipe 12.

[0061] The stainless steel vibrating screen separates magnetic seeds from large sludge pieces. The magnetic seeds that pass through the screen enter a small dry magnetic separator for secondary purification. After removing impurities, they are returned to the storage tank 8 via the recovery pipe 14 for recycling.

[0062] The regenerated magnetic seeds are fed back into the wastewater tank 1 via the screw feeder 9, forming a closed-loop system of addition, separation, regeneration and reuse, which significantly reduces the consumption of magnetic seeds and the amount of hazardous waste generated.

[0063] During operation, the pretreatment is enhanced and three-phase synergistic control is implemented. A combination of chemical demulsification and low-speed stirring rapidly breaks down emulsified pollutants, significantly shortening pretreatment time. Simultaneously, an inert gas aeration module is added to effectively remove dissolved harmful gases, filling the gap in traditional processes for treating gaseous pollutants. This achieves simultaneous purification of solid, liquid, and gaseous pollutants, preventing secondary pollution. The screw feeder and flow meter are linked for precise adjustment of the magnetic seed dosage, avoiding over- or under-dosing. Combined with a composite coagulant, this accelerates the binding of magnetic seeds with pollutants, significantly improving adsorption efficiency and magnetic seed recovery rate, forming a closed-loop circulation system. This reduces the need for fresh magnetic seed replenishment, lowering operating costs. The cascaded design of the two-stage magnetic separation system first coarsely separates large flocs, then finely captures fine particles, significantly improving separation accuracy, greatly reducing suspended solids in the effluent, and significantly enhancing water quality stability. The magnetic seed regeneration system achieves efficient purification and reuse of magnetic seeds, reducing hazardous waste generation and end-of-pipe disposal pressure. The overall process forms a resource internal cycle, combining environmental and economic benefits.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic separation-type three-phase hazardous wastewater separation and treatment process, characterized in that: The following steps are included: S1. Wastewater pretreatment: After removing large particulate impurities from non-magnetic wastewater through a screen, polyacrylamide demulsifier is added and the wastewater is stirred at low speed. S2. Hazardous gas treatment: Inert gas is introduced into the wastewater through the aeration components to transfer dissolved gases from the liquid phase to the gas phase. The gas is then extracted by the gas sampling hood and injected into the activated carbon adsorption tower for purification before being discharged. S3. Intelligent magnetic seed addition: A screw feeder is added to the pipeline. The amount of magnetic seed added is controlled by adjusting the screw speed. A float flow meter is used to monitor the flow in real time. The wastewater is given magnetism. After adding the composite coagulant, high-speed stirring is used to achieve rapid combination of magnetic seed and pollutants in the wastewater. S4, Two-stage magnetic separation system: (1) First stage coarse separation: using a permanent magnet roller to separate large magnetic flocs; (2) Second stage of fine separation: a series flat plate magnetic separator captures the escaped fine particles and removes flocculent pollutants to retain clean water; S5. Magnetic Seed Recovery: A stainless steel vibrating screen is used to separate magnetic seeds from large pieces of sludge, and the screened material is magnetic. S6. Magnetic Seed Regeneration: Equipped with a small dry magnetic separator, the magnetic seeds under the screen are purified and recovered. S7. Reuse of magnetic seeds: The screened magnetic seeds are fed back into S2 via a screw feeder to give the wastewater magnetism.

2. The magnetic separation type three-phase hazardous wastewater separation and treatment process according to claim 1, characterized in that: In step S2, a microporous aerator is used, and the inert gas is nitrogen.

3. The magnetic separation type three-phase hazardous wastewater separation and treatment process according to claim 1, characterized in that: In S4, an 800mT permanent magnet drum is connected in series with a 400mT flat magnetic separator.

4. The magnetic separation type three-phase hazardous wastewater separation and treatment process according to claim 1, characterized in that: In S5, an 80-mesh stainless steel vibrating screen is used.

5. The magnetic separation type three-phase hazardous wastewater separation and treatment process according to claim 1, characterized in that: In S6, the magnetic field strength of the small dry magnetic separator is 0.3T.

6. The magnetic separation type three-phase hazardous wastewater separation and treatment process according to claim 1, characterized in that: In S4, the flat magnetic separator is equipped with an automatic scraper and is cleaned every 2 hours.

7. The magnetic separation type three-phase hazardous wastewater separation and treatment process according to claim 1, characterized in that: In S4, the surface of the permanent magnet roller is coated with a Teflon coating.

8. A magnetic separation type three-phase hazardous wastewater separation and treatment device, characterized in that: The system includes a wastewater tank (1), a two-stage magnetic separation assembly (10) consisting of a permanent magnet drum and a flat magnetic separator connected in series, and a magnetic seed recovery and regeneration assembly (13) consisting of a stainless steel vibrating screen and a small dry magnetic separator. The top of the inner cavity of the wastewater tank (1) is equipped with a stainless steel grid. A float flow meter is installed on the wastewater tank (1). A screw feeder (9) is connected to the top of the side wall of the wastewater tank (1). A storage tank (8) for storing magnetic seeds is installed at the other end of the top of the screw feeder (9). A mixing assembly (4) for stirring the inside of the wastewater tank (1) is installed at the bottom of the wastewater tank (1). A chemical dosing device is connected to the side wall of the wastewater tank (1). The top of the wastewater tank (1) is connected to an air sampling hood (6), and an aeration assembly (5) is provided at the bottom of the inner cavity of the wastewater tank (1). The input end of the aeration assembly (5) is located outside the wastewater tank (1). The bottom of the inner cavity of the wastewater tank (1) is connected to the inlet of the dual-stage magnetic separation assembly (10) through a first connecting pipe (11). The outlet of the dual-stage magnetic separation assembly (10) is connected to the inlet of the magnetic seed recycling and regeneration assembly (13) through a second connecting pipe (12). The outlet of the magnetic seed recycling and regeneration assembly (13) is connected to the storage tank (8) through a recycling pipe (14).

9. A magnetic separation type three-phase hazardous wastewater separation and treatment device according to claim 8, characterized in that: The top of the gas sampling hood (6) is provided with a first flange pipe (7) that communicates with the feed pipe of the activated carbon adsorption tower.

10. A magnetic separation type three-phase hazardous wastewater separation and treatment device according to claim 8, characterized in that: The top of the wastewater tank (1) is provided with a second flange pipe (2) that is connected to the external wastewater discharge pipe.

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