High-efficiency low-consumption oil-water emulsion continuous separation device

Abstract

The invention discloses an efficient and low-consumption oil-water emulsion continuous separation device, and belongs to the technical fields of water treatment, membrane technologies and oil-water separation. The device mainly comprises a bubble generating device, a magnetic roller, magnetic particles and a membrane assembly. The collection of the magnetic particles does not need to construct an environment condition with ultrahigh magnetic field intensity, the magnetic particles are migrated to the liquid level through the adhesion effect between bubbles and the magnetic particles and can be collected by the magnetic roller with low magnetic field intensity, the collection rate of the magnetic particles is obviously improved, the magnetic particles are cleaned to be recycled, the operation cost of the oil-water separation device is reduced, and the oil-water separation device is suitable for large-scale popularization and application. And low-consumption operation of the device is realized. The magnetic particles and bubbles are adhered and collected by the magnetic roller, which is also a demulsification process of the magnetic particles, separation of the membrane on the emulsion is converted into separation of an oil-water mixture, the load of membrane separation on the emulsion is reduced, the separation flux of the membrane is improved, and efficient operation of the device is realized. The adhesion of the magnetic particles and the bubbles can avoid the aggregation of the magnetic particles on the surface of the membrane, and the generated aeration effect can also clean the surface of the membrane, so that the anti-pollution performance of the surface of the membrane is improved, and the continuous operation of the device is realized. The membrane surface designed in the device and the morphology of the magnetic particles can be flexibly designed according to the actual operation condition, and the anti-pollution capacity of the membrane assembly is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to the field of emulsion separation devices, and in particular to a high-efficiency and low-consumption oil-water emulsion continuous separation device. Background Art

[0002] Magnetic separation technology, a long-established physical technique, first emerged in the mineral processing industry. In the 1960s, magnetic coagulation separation technology was developed and applied to the water treatment industry. In the 1970s, HGMS high-gradient magnetic filters achieved large-scale water purification applications. In the 1980s, magnetic flocculation separation technology improved wastewater separation rates and began to purify water containing non-magnetic contaminants. In the 1970s, Sweden began using magnetic disks to treat heavy metal wastewater. In the 1990s, disk adsorption technology began to replace HGMS high-gradient magnetic filters, simplifying the process and operation, improving wastewater treatment efficiency, and reducing economic costs. The efficient recovery and recycling of magnetic seeds is an application technology that combines economical, high-efficiency, and environmentally friendly technology.

[0003] Among the magnetic separation devices developed, the most widely used are disc magnetic separators and high-gradient magnetic separators. Disc magnetic separators are simple, require little space, and consume little energy. However, due to the weak magnetic force of the magnets, they have difficulty separating weakly magnetic particles. High-gradient magnetic separators can treat large amounts of wastewater, are highly efficient, require simple equipment, and do not cause secondary pollution. However, the separation efficiency of high-gradient magnetic separation depends on the magnetic force generated by the magnetic concentrator and the magnitude of the magnetic field gradient, resulting in high energy consumption and high costs.

[0004] Flotation separation technology, developed in recent decades, relies on the principle of surface interaction between bubbles and particles. Using bubbles as carriers, it causes colloidal particles in a solution to adhere or adsorb at the air-liquid interface, rapidly separating them from the mother liquid, thereby achieving particle enrichment and remote capture. However, its application in smaller particles, ions, and molecules is limited. Compared to other separation technologies, flotation offers advantages such as simple equipment, ease of scale-up, continuous operation, and low energy consumption.

[0005] Based on current research, the present invention discloses a high-efficiency, low-consumption continuous separation device for oil-water emulsions, which consists of a bubble generating device, wettable particles modified from magnetic particles, a super-wettability membrane with magnetic particles loaded on the surface, a gas flow meter, a gas pressure gauge, a magnetic roller, and a peristaltic pump. The liquid circulates through a peristaltic pump tube. The surface of the magnetic particles used for the emulsion has wettability, and is hydrophobic when separating oil-in-water, and is hydrophilic when separating water-in-oil. The magnetic particles adhere to form aggregates when colliding with bubbles, and migrate to the liquid surface under the action of buoyancy and are collected by the magnetic roller. Therefore, the magnetic particles can be completely collected under a low magnetic field. In addition, the migration characteristics of the magnetic particles in the continuous separation device for oil-water emulsions and the aeration effect of the bubbles on the membrane surface enhance the anti-pollution ability of the membrane surface, thereby realizing the continuous separation of the oil-water emulsion by the device. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a high-efficiency and low-consumption continuous oil-water emulsion separation device, solve the problems of difficult collection of magnetic particles, low energy efficiency and inability to operate continuously in existing oil-water separation devices, and promote the development and application of continuous oil-water emulsion separation devices.

[0007] The technical solution adopted by the present invention to solve its technical problems is to provide a high-efficiency, low-consumption continuous oil-water emulsion separation device, which mainly includes a bubble generating device, a magnetic roller, magnetic particles and a membrane assembly. The membrane assembly is placed above the bubble generating device, which is located at the bottom of the processing box and is connected to a gas flow meter to control the gas generation rate. The water outlet of the separation device is located at the membrane assembly. The membrane assembly is pumped by a peristaltic pump, and a pressure gauge is added to monitor the pressure during membrane filtration, so that the membrane filters the emulsion to obtain purified oil / water. The magnetic roller is located above the liquid surface and is controlled to rotate at a low speed by a reduction motor and a coupling. The magnetic roller collects the magnetic particles on the liquid surface and, under the rotation of the reduction motor, uses a blade to continuously scrape the magnetic particles into a magnetic particle collection container. The oil-water emulsion separation device comprises a bubble generator, wettable particles modified from magnetic particles, a superwettability membrane loaded with magnetic particles, a gas flowmeter, a gas pressure gauge, a magnetic roller, and a peristaltic pump. Liquid is circulated through the peristaltic pump tube. The membrane used for emulsion separation possesses both magnetic and superwettability, exhibiting superhydrophobicity when separating oil-in-water and superhydrophilicity when separating oil-in-water.

[0008] Furthermore, the surface of the magnetic particles used in the emulsion has wettability, making them hydrophobic for oil-in-water separations, such as by modifying them with KH1231, and hydrophilic for oil-in-water separations, such as by modifying them with KH550. When the magnetic particles collide with bubbles, they adhere to form aggregates, which then migrate to the liquid surface under buoyancy and are collected by a magnetic roller.

[0009] Furthermore, the membrane for separating emulsions has magnetism and superwettability, and has superhydrophobicity when separating oil-in-water. For example, PVDF can be doped with magnetic particles to prepare the membrane, and has superhydrophilicity when separating water-in-oil. For example, PAN material can be doped with magnetic particles to prepare the membrane.

[0010] Furthermore, the area of ​​the bubble generating device occupies 70-80% of the bottom of the box, and the gas flow is controlled by a gas flow meter.

[0011] The beneficial effects of the present invention are:

[0012] First, the collection of magnetic particles does not require the construction of an environment with ultra-high magnetic field strength. Through the adhesion between bubbles and magnetic particles, the magnetic particles are migrated to the liquid surface and can be collected by the magnetic roller with low magnetic field strength, which significantly improves the collection rate of magnetic particles. The magnetic particles can also be cleaned for recycling, reducing the operating cost of the oil-water separation device and realizing low-consumption operation of the device.

[0013] Second, the adhesion of magnetic particles to bubbles and their collection by the magnetic roller is also a demulsification process of the magnetic particles, which converts the membrane's separation of emulsions into the separation of oil-water mixtures, reducing the membrane's load on emulsion separation, increasing the membrane's separation flux, and achieving efficient operation of the device.

[0014] Third, the adhesion of magnetic particles to bubbles can prevent the aggregation of magnetic particles on the membrane surface, and the resulting aeration effect can also clean the membrane surface, improving the anti-pollution performance of the membrane surface and realizing continuous operation of the device.

[0015] Fourth, the morphology of the membrane surface and magnetic particles designed in the device can be flexibly designed according to actual operating conditions to improve the anti-pollution ability of the membrane component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Flowchart of the operation of the air flotation-magnetic particle-magnetic membrane device for separating oil-in-water emulsions. (a) is a detailed diagram of the dimensions of the magnetic roller; (b), (c), and (d) are diagrams of the structural composition of the magnetic particles, membrane pool, and magnetic membrane, respectively.

[0017] Figure 2 Flowchart of the air flotation-magnetic particle-magnetic membrane device used to separate water-in-oil emulsions. (a) Detailed diagram of the magnetic roller dimensions; (b), (c), and (d) are diagrams of the structural composition of the magnetic particles, membrane pool, and magnetic membrane, respectively.

[0018] Figure 3 The flux changes of the system treating oil-in-water emulsion under different gas flow rates. (ae) are the flux status diagrams within 30 minutes at different gas flow rates of 40mL / min, 120mL / min, 200mL / min, 280mL / min, and 360mL / min; (f) is the flux loss rate under different gas flow rates.

[0019] Figure 4 The flux changes of the system treating water-in-oil emulsion under different gas flow rates. (ae) are the flux status diagrams within 30 minutes at different gas flow rates of 40mL / min, 120mL / min, 200mL / min, 280mL / min, and 360mL / min; (f) is the flux loss rate under different gas flow rates. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the present invention can be embodied in other specific forms and can also be subjected to non-specific modifications and variations. For example, the magnetic particles and magnetic films are not limited to one type and can also be modified with other compounds, such as ethyl orthosilicate. These modifications and variations do not depart from the scope of protection of the present invention. Other embodiments derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of the technical innovation of the present invention.

[0021] Example 1

[0022] in accordance with Figure 1-2 The system operates as follows: Magnetic nanoparticles are added to the reaction chamber. The magnetic particles in the feed solution are captured by rising bubbles and concentrated at the liquid surface, forming a magnetic particle-rich solution zone. The liquid in the chamber is then filtered through a membrane pool and collected by a peristaltic pump. A magnetic roller captures the highly bubble-enriched magnetic particles near its surface and continuously removes them from the reaction chamber via a scraper, ultimately completing the magnetic separation process. The peristaltic pump continuously feeds wastewater into the device, while simultaneously adjusting the pump to maintain proper contact between the liquid level in the device and the magnetic roller. The magnetic nanoparticles are continuously removed by the magnetic roller and, under the action of the scraper, enter a particle receiving container for ultrasonic cleaning.

[0023] Example 2

[0024] in accordance with Figure 3 , the experiment was conducted to separate the oil-in-water emulsion by filtration under different gas flow rates for 30 minutes. Figure 3 As shown in (b-f). For the magnetic film, without the application of gas, the flux reduction rate was 79.80%. However, after the application of gas, the flux reduction rate decreased significantly. When the gas flow rate increased from 40 mL / min to 280 mL / min, the membrane flux gradually stabilized, and the reduction rate decreased from 44.34% to 18.20%. When the flux was further increased from 280 mL / min to 360 mL / min, the reduction rate changed from 18.20% to 17.63%.

[0025] Example 3

[0026] in accordance with Figure 4, continue to filter and separate the water-in-oil emulsion for 30 minutes. Figure 4 As shown in (b-f). Without gas application, the membrane flux reduction rate was 77.23%. However, with gas application, the flux reduction rate decreased significantly. When the gas flow rate increased from 40 mL / min to 280 mL / min, the membrane flux gradually stabilized, with the reduction rate decreasing from 27.01% to 11.44%. When the flux was further increased from 280 mL / min to 360 mL / min, the reduction rate reached 11.78%.

Claims

1. A high-efficiency, low-consumption oil-water emulsion continuous separation device, mainly comprising a bubble generating device, a magnetic roller, magnetic particles and a membrane assembly, characterized in that: The membrane assembly is placed on the bubble generating device, which is located at the bottom of the processing box and is connected to a gas flow meter to control the gas generation rate; the water outlet of the separation device is at the membrane assembly, the membrane assembly is sucked by a peristaltic pump, and a pressure gauge is added to monitor the pressure during membrane filtration so that the membrane filters the emulsion to obtain purified oil / water, and a pressure gauge is added to monitor the pressure during membrane filtration to obtain purified oil / water; the magnetic roller is located above the liquid surface and is controlled to rotate at a low speed by a reduction motor and a coupling. The magnetic roller collects the magnetic particles on the liquid surface and then uses a blade to continuously scrape the magnetic particles into a magnetic particle collection container under the rotation of the reduction motor.

2. The high-efficiency, low-consumption oil-water emulsion continuous separation device according to claim 1, characterized in that: The oil-water emulsion separation device is composed of a bubble generating device, wettable particles modified from magnetic particles, a super-wettability membrane with magnetic particles on the surface, a reaction box, a gas flow meter, a gas pressure gauge, a magnetic roller, and a peristaltic pump. The liquid circulates through the peristaltic pump tube. The box accommodates an emulsion volume of 1-4L; the reaction box is 150-300mm*200-400mm*180-360mm; the size of the membrane assembly is 50-100mm*50-100mm*50-100mm. The membrane used to separate the emulsion has magnetic and super-wettability, and has super-hydrophobicity when separating oil-in-water and super-hydrophilicity when separating water-in-oil. The content of added magnetic particles is 0-5wt% for The surface of the magnetic particles in the emulsion is wettable, and is hydrophobic when separating oil-in-water, and hydrophilic when separating water-in-oil. The length of the magnetic roller is 150-300 mm, the diameter of the magnetic roller is 200-400 mm, and the magnetic field strength of the magnetic roller is 0.002T-0.2T. The magnetic roller is connected to the magnetic roller using a reduction motor and a coupling. The rotation speed of the magnetic roller is 5-20 rpm, and the distance between the magnetic roller and the liquid surface is 0-20 mm. The gas flow rate of the bubble generating device is 40-400 mL / min, the shape is circular, and the diameter is 80-100 mm. The rotation speed of the peristaltic pump tube is 40-70 rpm, and the model of the peristaltic pump tube is 17#. The size of the scraper is 150-300 mm*150-300 mm.

Images