Zero-electrode-distance packed bed electric flocculation oil-water separation device and application

Abstract

The invention relates to a zero-electrode-distance packed bed electric flocculation oil-water separation device and application. The device is composed of a solar panel, a storage battery, a direct-current power supply, a magnetic stirrer, a reactor, an iron support, a waste aluminum ring-pull can, a conductive metal net, an insulating material lining and an alligator clip. By constructing a cathode with a special structure and a connection mode thereof, the distance between the cathode and the anode of the electric flocculation is infinitely shortened to zero, so that the voltage required by the electric flocculation and the electric flocculation time are reduced, and the effective reduction of energy consumption and the effective removal of chemical oxygen demand (COD) are realized; in addition, the extremely small electrode distance is beneficial to charge transmission and reduction of ohmic drop of an electric flocculation system, and the reaction rate of electric flocculation is improved; the device can be introduced into an electric flocculation wastewater treatment process so as to improve the utilization rate of wastewater resources. The effect of the electric flocculation reaction can be effectively improved, and a new thought is provided for application and development of the electric flocculation process.

Description

Technical Field

[0001] The invention relates to the technical field of high-salinity oily wastewater treatment, and in particular to a zero-electrode distance packed bed electro-flocculation oil-water separation device and a use thereof. Background Art

[0002] The treatment of high-salinity oily wastewater is a complex process, and different treatment methods need to be selected according to actual conditions. As an emerging electrochemical wastewater treatment technology, electrocoagulation aims to solve practical problems such as secondary pollution caused by the addition of chemical agents in traditional chemical treatment methods. This technology is based on the principle of electrochemistry. It induces electrochemical reactions by applying external voltage, converts electrical energy into chemical energy, and achieves flocculation and flotation of organic matter in wastewater, thereby effectively separating chemical oxygen demand (COD), heavy metals, suspended solids and other pollutants in water. This process has shown strong competitiveness in the field of sewage treatment due to its advantages such as simple facilities, small footprint, low cost, and no need to add chemicals. Despite this, electrocoagulation still faces the dual challenges of low chemical oxygen demand (COD) removal efficiency and excessive energy consumption in practical applications.

[0003] At present, the electro-flocculation process mainly increases the removal rate of chemical oxygen demand (COD) and reduces energy consumption by adding coagulants, adding devices and modifying electrodes. However, these methods have certain limitations. Adding agents and adding devices will increase the operating cost, and although the method of modifying electrodes can prevent electrode passivation, it will cause pollution to the environment, and its adaptability is also limited due to the characteristics of different wastewaters. Chinese invention patent CN114835207A discloses a plate modification method and application for alleviating the passivation of the plate in electro-flocculation, by pasting a hollow insulating material grid on the surface of the plate facing the anode and the cathode, dividing a plurality of active sub-areas, thereby adjusting the distribution of current density, reducing the passivation degree of each active sub-area, and obtaining a better electro-flocculation treatment effect. This technology effectively improves the electro-flocculation efficiency and reduces energy consumption by optimizing the current density distribution, while avoiding the introduction of additional pollutants. Despite this, the interval between the plates in this technology still exists, which limits the further improvement of the chemical oxygen demand (COD) removal efficiency and the reduction of energy consumption. However, setting the electrode distance too short may also bring a series of problems, such as increasing the risk of short circuit, causing uneven current distribution, aggravating electrode loss, causing safety accidents, etc. In addition, too short an electrode distance may also lead to a decrease in power conversion efficiency, thereby increasing overall energy consumption.

[0004] In response to the above challenges, the present invention provides a zero-electrode-distance packed bed electro-flocculation oil-water separation device and its use. The device uses waste aluminum cans as anodes, conductive metal mesh as cathodes, and an insulating material as an inner lining to prevent short circuits between the cathode and cathode. This design greatly reduces the distance between the electrodes, almost reaching zero distance, thereby significantly reducing the energy consumption during the electro-flocculation process and improving the electro-flocculation efficiency. Due to the reduction in the electrode distance, the electro-flocculation reaction is more concentrated and efficient, making the device perform well in treating difficult-to-treat wastewater such as high-salt and high-oil wastewater. Summary of the invention

[0005] The purpose of the present invention is to provide a zero electrode distance packed bed electro-flocculation oil-water separation device and its use in view of the deficiencies in the prior art. The device is composed of a solar panel, a storage battery, a DC power supply, a magnetic stirrer, a reactor, an iron frame, a waste aluminum can, a conductive metal mesh and an insulating material lining; by reducing the physical distance between the electrodes, even reaching a state of almost contact, the voltage drop between the electrodes and the overall energy consumption are significantly reduced. In the device, the electrodes are designed to be closely arranged to form a packed bed structure. This structure not only reduces the distance between the electrodes, but also increases the electrode surface area, thereby improving the electrolysis efficiency and the removal rate of pollutants. The device is particularly suitable for the treatment of high-salinity oily wastewater because it can achieve efficient flocculation and flotation at a lower voltage, thereby effectively removing oil droplets and suspended matter in the wastewater. In addition, due to the extremely small electrode distance, the volume of the device can be more compact, so it is suitable for environments with limited space. The zero electrode distance packed bed electro-flocculation oil-water separation device described in the present invention, through its unique design, not only improves the treatment efficiency, but also reduces the operating cost, and has important application prospects for treating difficult-to-treat wastewater such as oily wastewater.

[0006] The invention discloses a zero-electrode-distance packed bed electro-flocculation oil-water separation device, which comprises a solar panel (1), a storage battery (2), a direct current power supply (3), a magnetic stirrer (4), a reactor (5), an iron frame (6), waste aluminum cans (7), a conductive metal mesh (8), an insulating material lining (9) and an alligator clip (10); the solar panel (1) is connected to the storage battery (2), and the storage battery (2) is connected to the direct current power supply (3) and the magnetic stirrer (4) through a cable; one side of the direct current power supply (3) is fixed A magnetic stirrer (4) is provided, and a reactor (5) and an iron frame (6) are placed above the magnetic stirrer (4); waste aluminum cans (7) are provided in the reactor (5), a conductive metal mesh (8) is provided on the surface of the waste aluminum cans (7), an insulating material lining (9) is provided between the waste aluminum cans (7) and the conductive metal mesh (8), and the waste aluminum cans (7) and the conductive metal mesh (8) are connected to a DC power supply (3) through an alligator clip (10) with a wire; the specific operation is carried out according to the following steps:

[0007] a. Connect the solar panel (1) to the battery (2) to convert solar energy into electrical energy;

[0008] b. The waste aluminum can (7) is used as the anode, and the conductive metal mesh (8) disposed on its surface is used as the cathode;

[0009] c. Place the DC power supply (3), magnetic stirrer (4) and iron stand (6) on a stable desktop;

[0010] d. The reactor (5) is placed on a magnetic stirrer (4), and the iron frame (6) is adjusted so that the electrode pair consisting of the anode of the waste aluminum can (7) and the cathode of the conductive metal mesh (8) is kept at a height of 2 cm from the bottom of the reactor (5);

[0011] e. Connect the DC power supply (3) to the anode of the waste aluminum can (7) and the cathode of the conductive metal mesh (8) through an alligator clip with a wire (10);

[0012] f. The wastewater sample was added to the reactor (5), the magnetic stirrer (4) was started and the stirring rate was adjusted to 150-300 rpm;

[0013] g. Adjust the voltage of the DC power supply (3) to 2-6V to start the electrocoagulation reaction, which lasts for 4-20 minutes;

[0014] h. If necessary, the reactor (5), the waste aluminum cans (7) and the conductive metal mesh (8) can be replaced and steps a to f can be repeated.

[0015] The zero-electrode-distance packed-bed electro-flocculation oil-water separation device is used in the preparation of high-salinity oily wastewater separation.

[0016] The zero-electrode-distance packed-bed electro-flocculation oil-water separation device and its use described in the present invention have very close distances between electrodes, requiring only a layer of insulating material to prevent direct contact. Therefore, during the electro-flocculation demulsification process, only a lower voltage and a shorter time can be used to achieve a good chemical oxygen demand (COD) removal effect, while significantly reducing energy consumption.

[0017] The material of the reactor (5) is acrylic glass.

[0018] The conductive metal mesh (8) is made of stainless steel mesh.

[0019] The insulating material (9) is made of polyethylene.

[0020] The advantages of the present invention compared to the prior art are:

[0021] (1) The present invention uses waste aluminum cans as anodes, thereby realizing the recycling of waste and reducing material costs;

[0022] (2) The zero-electrode-distance packed-bed electro-flocculation oil-water separation device provided by the present invention significantly reduces the voltage drop between electrodes, reduces power consumption, and improves the energy efficiency of the electro-flocculation process;

[0023] (3) The zero-electrode-distance packed-bed electro-flocculation oil-water separation device provided by the present invention not only effectively reduces the chemical oxygen demand (COD) in water, but also significantly reduces energy consumption.

[0024] (4) The present invention achieves a chemical oxygen demand (COD) removal rate of 94.26% in just 16 minutes at a voltage of 5 V and a stirring speed of 250 rpm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a partial enlarged view of the electric flocculation electrode described in the present invention.

[0027] Labels in the figure: 1-solar panel, 2-battery, 3-DC power supply, 4-magnetic stirrer, 5-reactor, 6-iron stand, 7-waste aluminum cans, 8-conductive metal mesh cans, 9-insulating material lining, 10-crocodile clip. DETAILED DESCRIPTION

[0028] In order to make those skilled in the art more clearly understand the technical solution of the present invention, the present invention will be clearly and completely described in conjunction with the embodiments. However, these embodiments do not limit the scope of the present invention. These only represent some embodiments of the present invention and do not cover all possible implementation methods. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work also belong to the protection scope of the present invention.

[0029] It should be noted that the experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials used can be purchased on the market unless otherwise specified.

[0030] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] Preparation of high-salt oily wastewater: Take 24.50g sodium chloride, 5.20g magnesium chloride, 4.09g sodium sulfate, 1.16g calcium chloride, 0.695g potassium chloride, 0.201g potassium bicarbonate, 0.101g potassium bromide, 0.027g boric acid, 0.025g strontium chloride and 0.003g sodium fluoride and dissolve them in 980mL ultrapure water, stir at 1500rpm for 1h to make the salt completely dissolved in the water, then add 0.5g Tween-80, 10mL benzene and 10mL toluene, and stir continuously at 1500rpm for 12h.

[0032] Example 1

[0033] The invention discloses a zero-electrode-distance packed bed electro-flocculation oil-water separation device, which is composed of a solar panel 1, a battery 2, a DC power supply 3, a magnetic stirrer 4, a reactor 5, an iron frame 6, waste aluminum cans 7, a conductive metal mesh 8, an insulating material lining 9 and an alligator clip 10; the solar panel 1 is connected to the battery 2, and the battery 2 is connected to the DC power supply 3 and the magnetic stirrer 4 through a cable; a magnetic stirrer 4 is fixed on one side of the DC power supply 3, and a reactor 5 and an iron frame 6 are placed above the magnetic stirrer 4; waste aluminum cans 7 are arranged in the reactor 5, a conductive metal mesh 8 is arranged on the surface of the waste aluminum cans 7, an insulating material lining 9 is arranged between the waste aluminum cans 7 and the conductive metal mesh 8, and the waste aluminum cans 7 and the conductive metal mesh 8 are connected to the DC power supply 3 through an alligator clip 10 with a wire; the specific operation is performed according to the following steps:

[0034] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0035] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0036] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0037] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0038] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0039] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 200 rpm;

[0040] g. Adjust the voltage of DC power supply 3 to 2V, start the electrocoagulation reaction, and continue for 12 minutes;

[0041] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0042] The chemical oxygen demand (COD) removal rate of this embodiment is 86.18%, and the energy consumption is 0.019 kWh / kg.

[0043] Example 2

[0044] The device of the present invention is carried out according to Example 1, and the specific operation is carried out according to the following steps:

[0045] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0046] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0047] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0048] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0049] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0050] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 150 rpm;

[0051] g. Adjust the voltage of DC power supply 3 to 3V, start the electrocoagulation reaction, and continue for 8 minutes;

[0052] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0053] The chemical oxygen demand (COD) removal rate of the electrode combination of this embodiment is 85.47%, and the energy consumption is 0.022 kWh / kg.

[0054] Example 3

[0055] The device of the present invention is carried out according to Example 1, and the specific operation is carried out according to the following steps:

[0056] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0057] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0058] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0059] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0060] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0061] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 300 rpm;

[0062] g. Adjust the voltage of DC power supply 3 to 4V, start the electrocoagulation reaction, and continue for 12 minutes;

[0063] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0064] The chemical oxygen demand (COD) removal rate of the electrode combination of this embodiment is 92.89%, and the energy consumption is 0.081 kWh / kg.

[0065] Example 4

[0066] The device of the present invention is carried out according to Example 1, and the specific operation is carried out according to the following steps:

[0067] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0068] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0069] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0070] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0071] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0072] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 200 rpm;

[0073] g. Adjust the voltage of DC power supply 3 to 4V, start the electrocoagulation reaction, and continue for 4 minutes;

[0074] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0075] The chemical oxygen demand (COD) removal rate of the electrode combination of this embodiment is 89.97%, and the energy consumption is 0.027 kWh / kg.

[0076] Example 5

[0077] The device of the present invention is carried out according to Example 1, and the specific operation is carried out according to the following steps:

[0078] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0079] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0080] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0081] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0082] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0083] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 250 rpm;

[0084] g. Adjust the voltage of DC power supply 3 to 4V, start the electrocoagulation reaction, and continue for 20 minutes;

[0085] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0086] The chemical oxygen demand (COD) removal rate of the electrode combination of this embodiment is 94.05%, and the energy consumption is 0.137 kWh / kg.

[0087] Example 6

[0088] The device of the present invention is carried out according to Example 1, and the specific operation is carried out according to the following steps:

[0089] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0090] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0091] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0092] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0093] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0094] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 250 rpm;

[0095] g. Adjust the voltage of DC power supply 3 to 5V, start the electrocoagulation reaction, and continue for 16 minutes;

[0096] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0097] The chemical oxygen demand (COD) removal rate of the electrode combination of this embodiment is 94.26%, and the energy consumption is 0.225 kWh / kg.

[0098] Example 7

[0099] The device of the present invention is carried out according to Example 1, and the specific operation is carried out according to the following steps:

[0100] a. Connect solar panel 1 to battery 2 to convert solar energy into electrical energy;

[0101] b. The waste aluminum cans 7 are used as anodes, and the conductive metal mesh 8 is provided on the surface as cathodes. Figure 2 ;

[0102] c. Place the DC power supply 3, magnetic stirrer 4 and iron stand 6 on a stable desktop;

[0103] d. Place the reactor 5 on the magnetic stirrer 4, adjust the iron frame 6 so that the electrode pair consisting of the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 is maintained at a height of 2 cm from the bottom of the reactor 5;

[0104] e. Connect the DC power supply 3 to the anode of the waste aluminum can 7 and the cathode of the conductive metal mesh 8 through the alligator clip 10 with a wire;

[0105] f. The prepared wastewater sample was added to the reactor 5, the magnetic stirrer 4 was started and the stirring rate was adjusted to 200 rpm;

[0106] g. Adjust the voltage of DC power supply 3 to 6V, start the electrocoagulation reaction, and continue for 12 minutes;

[0107] h. If necessary, the reactor 5, the waste aluminum cans 7 and the conductive metal mesh 8 materials can be replaced and steps a to f can be repeated.

[0108] The chemical oxygen demand (COD) removal rate of the electrode combination of this embodiment is 94.07%, and the energy consumption is 0.265 kWh / kg.

[0109] The zero-electrode-distance packed-bed electro-flocculation oil-water separation device and its use described in the present invention have very close distances between electrodes, requiring only a layer of insulating material to prevent direct contact. Therefore, during the electro-flocculation demulsification process, only a lower voltage and a shorter time can be used to achieve a good chemical oxygen demand (COD) removal effect, while significantly reducing energy consumption.

Claims

1. A zero-electrode distance packed bed electro-flocculation oil-water separation device, characterized in that: The device comprises a solar panel (1), a storage battery (2), a direct current power supply (3), a magnetic stirrer (4), a reactor (5), an iron frame (6), waste aluminum cans (7), a conductive metal mesh (8), an insulating material lining (9) and an alligator clip (10); the solar panel (1) is connected to the storage battery (2), and the storage battery (2) is connected to the direct current power supply (3) and the magnetic stirrer (4) through a cable; a magnetic stirrer (4) is fixed on one side of the direct current power supply (3) and a magnetic stirrer (4) is fixed on the magnetic frame (6) A reactor (5) and an iron frame (6) are placed above the stirrer (4); a waste aluminum can (7) is placed in the reactor (5); a conductive metal mesh (8) is placed on the surface of the waste aluminum can (7); an insulating material lining (9) is placed between the waste aluminum can (7) and the conductive metal mesh (8); the waste aluminum can (7) and the conductive metal mesh (8) are connected to a DC power supply (3) via an alligator clip (10) with a wire; the specific operation is performed according to the following steps: a. Connecting the solar panel (1) to the battery (2) to convert solar energy into electrical energy; b. The waste aluminum cans (7) are used as anodes, and the conductive metal mesh (8) disposed on the surface thereof is used as cathodes; c. Place the DC power supply (3), magnetic stirrer (4) and iron stand (6) on a stable desktop; d. Place the reactor (5) on the magnetic stirrer (4), and adjust the iron stand (6) so that the electrode pair consisting of the waste aluminum can (7) anode and the conductive metal mesh (8) cathode is maintained at a height of 2 cm from the bottom of the reactor (5); e. Connect the DC power supply (3) to the anode of the waste aluminum can (7) and the cathode of the conductive metal mesh (8) through the alligator clip with the wire (10); f. Add the wastewater sample to the reactor (5), start the magnetic stirrer (4) and adjust the stirring rate to 150-300 rpm; g. Adjust the voltage of the DC power supply (3) to 2-6 V to start the electrocoagulation reaction, which lasts for 4-20 minutes; h. If necessary, the reactor (5), waste aluminum cans (7) and conductive metal mesh (8) materials can be replaced and steps a to f can be repeated.

2. Use of the zero-electrode-distance packed-bed electro-flocculation oil-water separation device as described in claim 1 in the preparation of high-salinity oily wastewater separation.

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