Particle electrode recovery system and method for wastewater treatment

Abstract

The embodiment of the invention discloses a particle electrode recovery system and method for wastewater treatment, when a wastewater treatment module is used for treating wastewater, a first electrode and a second electrode in a wastewater container and a particle electrode in the wastewater form a three-dimensional electrode system, so that the electrochemical reaction area is increased, and the wastewater treatment efficiency is improved. Or a series of micro-electrolytic cells are formed to improve the pollutant removal efficiency; the particle electrode recycling module is used for separating and recycling particle electrodes in the wastewater treated by the wastewater treatment module, so that the waste of the particle electrodes is avoided, the recycled particle electrodes can be reused, the particle electrodes are fully utilized, and the wastewater treatment cost is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of wastewater treatment, and in particular to a particle electrode recovery system and method for wastewater treatment. Background Art

[0002] With the development of wastewater treatment technology, electrochemical treatment methods have been widely used.

[0003] In the prior art, two-dimensional electrode systems are often used for electrochemical treatment of wastewater, but two-dimensional electrodes have the disadvantages of small surface area, low current efficiency, and small processing capacity per unit tank. Therefore, three-dimensional electrochemical treatment methods have been proposed, but the wastewater produced by three-dimensional electrochemical flooding contains a large number of particle electrodes, resulting in waste of particle electrodes and high wastewater treatment costs. Summary of the invention

[0004] The present invention provides a particle electrode recovery system and method for wastewater treatment, so as to recover the particle electrodes, fully utilize the particle electrodes and reduce the wastewater treatment cost.

[0005] In a first aspect, an embodiment of the present invention provides a particle electrode recovery system for wastewater treatment, comprising:

[0006] A wastewater treatment module, the wastewater treatment module comprises a wastewater container and a first electrode and a second electrode arranged in the wastewater container, the first electrode is connected to one of the positive electrode and the negative electrode of the first power supply, and the second electrode is connected to the other of the positive electrode and the negative electrode of the first power supply; the input port of the wastewater container is connected to the wastewater conveying pipeline, and the wastewater conveyed by the wastewater conveying pipeline comprises the particle electrode;

[0007] The particle electrode recovery module is connected to the output port of the wastewater container and is used to separate and recover the particle electrodes in the wastewater treated by the wastewater treatment module.

[0008] Optionally, the particle electrode is a magnetic particle electrode, and the particle electrode recovery module includes a magnetic adsorption unit, which is used to adsorb the magnetic particle electrode.

[0009] Optionally, the particle electrode recovery system for wastewater treatment also includes an electrochemical oil recovery device and an oil-water separation module;

[0010] The electrochemical oil production device comprises a displacement fluid injection module, a third electrode arranged in the injection well and a fourth electrode arranged in the production well, the third electrode and the fourth electrode are respectively connected to the positive electrode and the negative electrode of the second power supply;

[0011] The displacement fluid injection module is used to transport the displacement fluid to the injection well, the displacement fluid includes a particle electrode, the production well is connected to the input port of the oil-water separation module through the production fluid delivery pipeline, and the first output port of the oil-water separation module is connected to the wastewater delivery pipeline;

[0012] The oil-water separation module is used to separate oil and water from the produced fluid transported by the produced fluid transport pipeline, and to transport the separated wastewater to the wastewater container through the wastewater transport pipeline;

[0013] The particle electrode recovery module is in communication with the displacement fluid injection module and is used for delivering the recovered particle electrodes to the displacement fluid injection module.

[0014] Optionally, the displacement fluid injection module includes a particle electrode container, a displacement fluid container and a pump group. The particle electrode container is connected to the particle electrode recovery module through a particle electrode recovery pipeline. The particle electrode container is also connected to the displacement fluid container through a particle electrode delivery pipeline. The displacement fluid container is connected to the pump group through a first displacement fluid delivery pipeline, and the pump group is connected to the injection well through a second displacement fluid delivery pipeline.

[0015] Optionally, the displacement fluid injection module further includes an injection water container, and the injection water container is connected to the displacement fluid container through an injection water delivery pipeline.

[0016] Optionally, the second output port of the oil-water separation module is connected to a crude oil transmission pipeline.

[0017] Optionally, the particle electrode recovery system for wastewater treatment further includes a wastewater external transmission pipeline, which is connected to the particle electrode recovery module and is used to externally transport the wastewater after the particle electrode is recovered by the particle electrode recovery module.

[0018] Optionally, the first electrode is closer to the input port of the wastewater container than the second electrode, and the second electrode is closer to the output port of the wastewater container than the first electrode.

[0019] Optionally, the particle electrode comprises an iron-based magnetic particle electrode.

[0020] In a second aspect, an embodiment of the present invention further provides a particle electrode recovery method for wastewater treatment, comprising:

[0021] An electric field is applied between a first electrode and a second electrode in the wastewater container by a first power source of the wastewater treatment module, and the first electrode, the second electrode and the particle electrodes in the wastewater transported by the wastewater transport pipeline construct a three-dimensional electrode system in the wastewater container;

[0022] The particle electrode recovery module separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module.

[0023] The particle electrode recovery system and method for wastewater treatment of the embodiments of the present invention, when the wastewater treatment module treats the wastewater, the first electrode in the wastewater container, the second electrode and the particle electrodes in the wastewater form a three-dimensional electrode system to increase the area of ​​the electrochemical reaction, or form a series of micro-electrolytic cells to improve the pollutant removal efficiency; and the particle electrode recovery module separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module to avoid the waste of the particle electrodes. The recovered particle electrodes can be reused, thereby achieving full utilization of the particle electrodes and reducing the cost of wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a particle electrode recovery system for wastewater treatment provided by an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of another particle electrode recovery system for wastewater treatment provided by an embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of another particle electrode recovery system for wastewater treatment provided by an embodiment of the present invention;

[0027] Figure 4 is a flow chart of a particle electrode recovery method for wastewater treatment provided by an embodiment of the present invention;

[0028] Figure 5 This is a flow chart of another particle electrode recovery method for wastewater treatment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] Figure 1 is a schematic diagram of a particle electrode recovery system for wastewater treatment provided by an embodiment of the present invention, with reference to Figure 1The particle electrode recovery system for wastewater treatment includes a wastewater treatment module 100, including a wastewater container 110 and a first electrode 120 and a second electrode 130 arranged in the wastewater container 110, the first electrode 120 is connected to one of the positive electrode and the negative electrode of the first power supply 140, and the second electrode 130 is connected to the other of the positive electrode and the negative electrode of the first power supply 140; the input port of the wastewater container 110 is connected to the wastewater conveying pipeline L1, and the wastewater conveyed by the wastewater conveying pipeline L1 includes the particle electrode 10; the particle electrode recovery module 200, the particle electrode recovery module 200 is connected to the output port of the wastewater container 110, and the particle electrode recovery module 200 is used to separate and recover the particle electrode 10 in the wastewater treated by the wastewater treatment module 100.

[0031] Among them, the particle electrode recovery system for wastewater treatment of this embodiment can be used for wastewater treatment after crude oil extraction. In this case, the wastewater delivery pipeline L1 of the wastewater treatment system can be connected to the oil production device of crude oil extraction, and the produced wastewater of the oil production device is transported to the wastewater container 110 of the wastewater treatment module 100 through the wastewater delivery pipeline L1. The wastewater treatment module 100 performs electrochemical treatment on the wastewater in the wastewater container 110 to remove pollutants in the wastewater. The particle electrode recovery system for wastewater treatment of this embodiment can also be used for wastewater treatment in other cases besides crude oil extraction, and this embodiment is not specifically limited here.

[0032] In the embodiment of the present invention, the wastewater treatment module 100 includes a wastewater container 110 and a first electrode 120 and a second electrode 130 disposed in the wastewater container 110, and may further include a first power supply 140. Exemplarily, the positive electrode of the first power supply 140 is electrically connected to the first electrode 120, and the negative electrode of the first power supply 140 is electrically connected to the second electrode 130. In other optional embodiments of the present invention, the negative electrode of the first power supply 140 is electrically connected to the first electrode 120, and the positive electrode of the first power supply 140 is electrically connected to the second electrode 130. After the first power supply 140 is turned on, an electric field is formed between the first electrode 120 and the second electrode 130, and the wastewater includes a particle electrode 10. Under the action of the electric field, the particle electrode 10 will be charged to form an independent micro-electrode. Therefore, when treating wastewater, it is equivalent to forming a three-dimensional electrode system, increasing the area of ​​the electrochemical reaction, or forming a series of micro-electrolysis cells to improve the pollutant removal efficiency.

[0033] In this embodiment, the particle electrode recovery system for wastewater treatment also includes a particle electrode recovery module 200, which is connected to the output port of the wastewater container 110. For example, the particle electrode recovery module 200 is transported to the particle electrode recovery module 200 through the treated wastewater delivery pipeline L2. The particle electrode recovery module 200 may include a particle electrode recovery container. The wastewater treated by the wastewater treatment module 100 can be transported to the particle electrode recovery container. The particle electrode recovery module 200 separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module 100 to avoid waste of the particle electrodes. The recovered particle electrodes can be used for electrochemical oil recovery, or for continuing wastewater treatment, so as to fully utilize the particle electrodes and reduce the cost of wastewater treatment. Among them, when the particle electrodes are recovered, they can be recovered by adsorption or the like. Exemplarily, the particle electrode 10 is a magnetic particle electrode, for example, the particle electrode 10 includes an iron-based magnetic particle electrode, and the particle electrode recovery module 200 may include a magnetic adsorption unit for adsorbing the magnetic particle electrode. Optionally, the magnetic adsorption unit may include an electromagnetic adsorption plate.

[0034] The particle electrode recovery system for wastewater treatment of this embodiment forms a three-dimensional electrode system with the first electrode, the second electrode and the particle electrodes in the wastewater container when the wastewater is treated by the wastewater treatment module, thereby increasing the area of ​​the electrochemical reaction or forming a series of micro-electrolytic cells to improve the pollutant removal efficiency; and the particle electrode recovery module separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module, thereby avoiding the waste of the particle electrodes. The recovered particle electrodes can be reused, thereby achieving full utilization of the particle electrodes and reducing the cost of wastewater treatment.

[0035] Figure 2 is a schematic diagram of the structure of another particle electrode recovery system for wastewater treatment provided by an embodiment of the present invention, with reference to Figure 2Optionally, the particle electrode recovery system for wastewater treatment also includes an electrochemical oil recovery device 300 and an oil-water separation module 400; the electrochemical oil recovery device 300 includes a displacement fluid injection module 310, a third electrode 320 arranged in the injection well and a fourth electrode 330 arranged in the production well, the third electrode 320 and the fourth electrode 330 are respectively connected to the positive electrode and the negative electrode of the second power supply 340; the displacement fluid injection module 310 is used to transport the displacement fluid to the injection well, the displacement fluid includes the particle electrode, and the production well is connected to the positive electrode 320 and the negative electrode 330 of the second power supply 340. The produced liquid delivery pipeline L3 is connected to the input port of the oil-water separation module 400, and the first output port of the oil-water separation module 400 is connected to the wastewater delivery pipeline L1; the oil-water separation module 400 is used to separate oil and water from the produced liquid delivered by the produced liquid delivery pipeline L3, and deliver the separated wastewater to the wastewater container 110 through the wastewater delivery pipeline L1; the particle electrode recovery module 200 is connected to the displacement fluid injection module 310, and is used to deliver the recovered particle electrodes to the displacement fluid injection module 310.

[0036] Specifically, the electrochemical oil production device 300 produces oil by electrochemical drive. The displacement fluid injection module 310 of the electrochemical oil production device 300 can inject displacement fluid into the injection well, the injection well is provided with a third electrode 320, and the production well is provided with a fourth electrode 330, the third electrode 320 is connected to the positive electrode of the second power supply 340, and the fourth electrode 330 is connected to the negative electrode of the second power supply 340, so that after the second power supply 340 is powered on, an electric field is formed in the oil layer between the injection well and the production well, forming a two-dimensional electrode system, wherein the second power supply 340 can be a direct current power supply. The displacement fluid includes a particle electrode. After the displacement fluid is injected into the injection well, the third electrode 320, the fourth electrode 330 and the particle electrode form a three-dimensional electrode system, so that the electrochemical reaction area can be enlarged, and an effective electrochemical displacement effect is formed on the vast oil layer between the injection well and the production well, thereby improving the crude oil recovery rate.

[0037] In this embodiment, the particle electrode recovery system further includes an oil-water separation module 400. The produced fluid of the production well is transported to the oil-water separation module 400 through the produced fluid delivery pipeline L3. The oil-water separation module 400 performs oil-water separation on the produced fluid. The first output port of the oil-water separation module 400 is connected to the wastewater delivery pipeline L1, and the separated wastewater is transported to the wastewater container 110 through the wastewater delivery pipeline L1, and then the wastewater is treated in the wastewater container 110. Optionally, the second output port of the oil-water separation module 400 is connected to the crude oil delivery pipeline L4, and the separated crude oil is transported to the outside through the crude oil delivery pipeline L4.

[0038] Since the displacement fluid contains particle electrodes, the wastewater separated from the produced fluid will also contain particle electrodes, so a three-dimensional electrode system can be established in the wastewater container 110 to remove pollutants in the wastewater. The treated wastewater is transported to the particle electrode recovery module 200 for particle electrode recovery. The particle electrode recovery module 200 is connected to the displacement fluid injection module 310, so the recovered particle electrodes can be transported to the displacement fluid of the displacement fluid injection module 310, and the displacement fluid can be further injected into the injection well. In this way, by transporting the particle electrodes to the displacement fluid injection module 310 after recovery, the particle electrodes are efficiently utilized and the waste of the particle electrodes is avoided. On the basis of improving the crude oil recovery rate by forming a three-dimensional electrochemical system and improving the pollutant removal efficiency in the wastewater by forming a three-dimensional electrochemical system, the oil production cost and the wastewater treatment cost are reduced.

[0039] Figure 3 is a schematic diagram of the structure of another particle electrode recovery system for wastewater treatment provided by an embodiment of the present invention, with reference to Figure 3 Optionally, the displacement fluid injection module includes a particle electrode container 311, a displacement fluid container 312 and a pump group 313. The particle electrode container 311 is connected to the particle electrode recovery module 200 through the particle electrode recovery pipeline L5. The particle electrode container 311 is also connected to the displacement fluid container 312 through the particle electrode delivery pipeline L6. The displacement fluid container 312 is connected to the pump group 313 through the first displacement fluid delivery pipeline L7. The pump group 313 is connected to the injection well through the second displacement fluid delivery pipeline L8.

[0040] like Figure 3 As shown, the particle electrode recovery module 200 is connected to the particle electrode container 311 through the particle electrode recovery pipeline L5, and the recovered particle electrodes can be transported to the particle electrode container 311 through the particle electrode recovery pipeline L5. The particle electrode container 311 is also connected to the displacement fluid container 312 through the particle electrode delivery pipeline L6, and the particle electrodes can be transported to the displacement fluid container 312 through the particle electrode delivery pipeline L6.

[0041] Optionally, the displacement fluid injection module further includes an injection water container 314, which is connected to the displacement fluid container 312 via an injection water delivery pipeline L9, and the water in the injection water container 314 is connected to the displacement fluid container 312 via an injection water delivery pipeline L9, and the water input into the displacement fluid container 312 is mixed with the particle electrode to form a displacement fluid.

[0042] The displacement fluid injection module further includes a pump group 313, which includes at least one pump, and the pump included in the pump group 313 may be a high-pressure pump. The displacement fluid in the displacement fluid container 312 is transported to the pump group 313 through the first displacement fluid delivery pipeline L7, and the pump group 313 pumps the displacement fluid into the injection well through the second displacement fluid delivery pipeline L8, so that the crude oil is displaced by the displacement fluid and moves to the production well, thereby realizing the production of crude oil.

[0043] Continue to refer Figure 3 Optionally, the particle electrode recovery system for wastewater treatment further includes a wastewater external transmission pipeline L10, which is connected to the particle electrode recovery module 200 and is used to externally transport the wastewater after the particle electrode is recovered by the particle electrode recovery module 200.

[0044] The wastewater transmission pipeline L10 is connected to the particle electrode recovery module 200. The particle electrode recovery module 200 may include an input port and two output ports. The input port of the particle electrode recovery module 200 may be connected to the wastewater container 110 via the treated wastewater transmission pipeline L2. One of the output ports of the particle electrode recovery module 200 is connected to the particle electrode container 311 via the particle electrode transmission pipeline L6 to realize the transportation of the particle electrode to the particle electrode container 311. The other output port of the particle electrode recovery module 200 is connected to the wastewater transmission pipeline L10 to realize the discharge of the wastewater after particle electrode recovery.

[0045] Continue to refer Figure 1-Figure 3 On the basis of the above technical solution, the first electrode 120 is close to the input port of the wastewater container 110 relative to the second electrode 130, and the second electrode 130 is close to the output port of the wastewater container 110 relative to the first electrode 120; that is, the first electrode 120 is arranged close to the input port of the wastewater container 110, and the second electrode 130 is arranged close to the output port of the wastewater container 110, so that the electrochemical reaction area between the first electrode 120 and the second electrode 130 is larger, the reaction space is increased, and it is beneficial to effectively remove pollutants in the wastewater.

[0046] The embodiment of the present invention also provides a particle electrode recovery method for wastewater treatment. Figure 4 is a flow chart of a particle electrode recovery method for wastewater treatment provided by an embodiment of the present invention, with reference to Figure 4 The particle electrode recovery method for wastewater treatment comprises:

[0047] Step 510: Apply an electric field between the first electrode and the second electrode in the wastewater container through the first power supply of the wastewater treatment module. The first electrode, the second electrode and the particle electrodes in the wastewater transported by the wastewater transport pipeline construct a three-dimensional electrode system in the wastewater container.

[0048] Step 520: The particle electrode recovery module separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module.

[0049] The particle electrode recovery method for wastewater treatment of this embodiment is applicable to the particle electrode recovery system for wastewater treatment of any of the above embodiments of the present invention, and has the beneficial effects of the particle electrode recovery system for wastewater treatment of any of the above embodiments of the present invention, which will not be repeated here.

[0050] Figure 5 is a flow chart of another particle electrode recovery method for wastewater treatment provided by an embodiment of the present invention. The particle electrode recovery method for wastewater treatment can be applied to Figure 2 and Figure 3 The particle electrode recovery system for wastewater treatment shown in Figure 2 is shown in Figure 2. Figure 5 The particle electrode recovery method for wastewater treatment comprises:

[0051] Step 610: Separate the produced liquid into crude oil and wastewater through the oil-water separation module, and transport the wastewater to a wastewater container.

[0052] Step 620: Apply an electric field between the first electrode and the second electrode in the wastewater container through the first power supply of the wastewater treatment module. The first electrode, the second electrode and the particle electrodes in the wastewater transported by the wastewater transport pipeline construct a three-dimensional electrode system in the wastewater container.

[0053] Step 630: The particle electrode recovery module separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module.

[0054] Step 640: The particle electrode recovery module transports the particle electrode to the displacement fluid injection module, the displacement fluid injection module injects the displacement fluid into the injection well, and the production well transports the produced fluid to the oil-water separation module.

[0055] After step 640 is completed, the process returns to step 610 , thereby achieving efficient utilization of the particle electrodes in the entire system.

[0056] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A particle electrode recovery system for wastewater treatment, characterized in that: include: A wastewater treatment module, the wastewater treatment module comprising a wastewater container and a first electrode and a second electrode arranged in the wastewater container, the first electrode being connected to one of a positive electrode and a negative electrode of a first power source, and the second electrode being connected to the other of the positive electrode and the negative electrode of the first power source; an input port of the wastewater container being connected to a wastewater delivery pipeline, and wastewater delivered by the wastewater delivery pipeline comprising a particle electrode; A particle electrode recovery module is connected to the output port of the wastewater container and is used to separate and recover the particle electrodes in the wastewater treated by the wastewater treatment module.

2. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that: The particle electrodes are magnetic particle electrodes, and the particle electrode recovery module comprises a magnetic adsorption unit, and the magnetic adsorption unit is used to adsorb the magnetic particle electrodes.

3. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that: It also includes an electrochemical oil recovery device and an oil-water separation module; The electrochemical oil recovery device comprises a displacement fluid injection module, a third electrode arranged in the injection well and a fourth electrode arranged in the production well, wherein the third electrode and the fourth electrode are respectively connected to the positive electrode and the negative electrode of the second power supply; The displacement fluid injection module is used to transport the displacement fluid to the injection well, the displacement fluid includes the particle electrode, the production well is connected to the input port of the oil-water separation module through the production fluid delivery pipeline, and the first output port of the oil-water separation module is connected to the wastewater delivery pipeline; The oil-water separation module is used to separate oil and water from the produced liquid transported by the produced liquid transport pipeline, and to transport the separated wastewater to the wastewater container through the wastewater transport pipeline; The particle electrode recovery module is in communication with the displacement fluid injection module, and is used for delivering the recovered particle electrodes to the displacement fluid injection module.

4. The particle electrode recovery system for wastewater treatment according to claim 3, characterized in that: The displacement fluid injection module includes a particle electrode container, a displacement fluid container and a pump group. The particle electrode container is connected to the particle electrode recovery module through a particle electrode recovery pipeline. The particle electrode container is also connected to the displacement fluid container through a particle electrode delivery pipeline. The displacement fluid container is connected to the pump group through a first displacement fluid delivery pipeline. The pump group is connected to the injection well through a second displacement fluid delivery pipeline.

5. The particle electrode recovery system for wastewater treatment according to claim 4, characterized in that: The displacement fluid injection module further includes an injection water container, and the injection water container is communicated with the displacement fluid container through an injection water delivery pipeline.

6. The particle electrode recovery system for wastewater treatment according to claim 3, characterized in that: The second output port of the oil-water separation module is communicated with the crude oil transmission pipeline.

7. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that: It also includes a wastewater export pipeline, which is connected to the particle electrode recovery module and is used to externally transport the wastewater after the particle electrode is recovered by the particle electrode recovery module.

8. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that: The first electrode is closer to the input port of the wastewater container than the second electrode, and the second electrode is closer to the output port of the wastewater container than the first electrode.

9. The particle electrode recovery system for wastewater treatment according to any one of claims 1 to 8, characterized in that: The particle electrodes include iron-based magnetic particle electrodes.

10. A particle electrode recovery method for wastewater treatment, characterized in that: include: Applying an electric field between a first electrode and a second electrode in a wastewater container through a first power source of the wastewater treatment module, wherein the first electrode, the second electrode, and particle electrodes in wastewater transported by a wastewater transport pipeline construct a three-dimensional electrode system in the wastewater container; The particle electrode recovery module separates and recovers the particle electrodes in the wastewater treated by the wastewater treatment module.

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