Particle electrode recovery system and method for wastewater treatment

Abstract

The embodiment of the application discloses a particle electrode recovery system and method for wastewater treatment. When the wastewater treatment module is used to treat wastewater, a three-dimensional electrode system is formed by the first electrode, the second electrode and the particle electrode in the wastewater in the wastewater container, the area of the electrochemical reaction is increased, or a series of micro-electrolytic cells are formed to improve the pollutant removal efficiency. The particle electrode recovery module is used to separate and recover the particle electrode in the wastewater treated by the wastewater treatment module, so that the waste of the particle electrode is avoided, the recovered particle electrode can be used again, the particle electrode is fully utilized, and the wastewater treatment cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more particularly to a particle electrode recovery system and method for wastewater treatment. Background Technology

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

[0003] In existing technologies, electrochemical treatment of wastewater often employs two-dimensional electrode systems. However, two-dimensional electrodes suffer from drawbacks such as small surface area, low current efficiency, and small throughput per unit tank. Therefore, three-dimensional electrochemical treatment methods have been proposed. However, the wastewater extracted by three-dimensional electrochemical processes contains a large number of particle electrodes, resulting in wasted particles and high wastewater treatment costs. Summary of the Invention

[0004] This invention provides a particle electrode recovery system and method for wastewater treatment, so as to realize the recovery of particle electrodes, make full use of particle electrodes, and reduce wastewater treatment costs.

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

[0006] The wastewater treatment module includes a wastewater container and a first electrode and a second electrode disposed in the wastewater container. The first electrode is connected to one of the positive and negative terminals of a first power source, and the second electrode is connected to the other of the positive and negative terminals of the first power source. The inlet of the wastewater container is connected to a wastewater conveying pipeline, and the wastewater conveyed by the wastewater conveying pipeline includes particle electrodes.

[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 after treatment 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 for adsorbing the magnetic particle electrode.

[0009] Optionally, the wastewater treatment particle electrode recovery system may also include an electrochemical oil recovery unit and an oil-water separation module;

[0010] The electrochemical oil recovery device includes a displacement fluid injection module, a third electrode installed in the injection well, and a fourth electrode installed in the production well. The third electrode and the fourth electrode are respectively connected to the positive and negative terminals of a second power source.

[0011] The displacement fluid injection module is used to deliver displacement fluid into the injection well. The displacement fluid includes particle electrodes. The production well is connected to the input port of the oil-water separation module through the production fluid delivery pipeline. 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 the produced fluid transported by the produced fluid delivery pipeline from oil and water, and to transport the separated wastewater to the wastewater container through the wastewater delivery pipeline.

[0013] The particle electrode recovery module is connected to the displacement fluid injection module and is used to transport 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 set. 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 set through a first displacement fluid delivery pipeline. The pump set is connected to the injection well through a second displacement fluid delivery pipeline.

[0015] Optionally, the displacement fluid injection module also includes an injection water container, which is connected to the displacement fluid container via an injection water delivery pipeline.

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

[0017] Optionally, the wastewater treatment particle electrode recovery system also includes a wastewater outgoing pipeline, which is connected to the particle electrode recovery module and is used to transport the wastewater after particle electrode recovery by the particle electrode recovery module to the outside.

[0018] Optionally, the first electrode is positioned closer to the inlet of the wastewater container than the second electrode, and the second electrode is positioned closer to the outlet of the wastewater container than the first electrode.

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

[0020] Secondly, embodiments of the present invention also provide a method for recovering particle electrodes from wastewater treatment, comprising:

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

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

[0023] The particle electrode recovery system and method for wastewater treatment in this invention, when the wastewater treatment module treats wastewater, forms a three-dimensional electrode system with the first electrode, the second electrode in the wastewater container, and the particle electrode in the wastewater, increasing the area of ​​the electrochemical reaction or forming a series of micro-electrolysis cells to improve pollutant removal efficiency; and the particle electrode recovery module separates and recovers the particle electrodes in the wastewater after treatment by the wastewater treatment module, avoiding waste of particle electrodes, and the recovered particle electrodes can be reused, thereby realizing the full utilization of particle electrodes and reducing wastewater treatment costs. Attached Figure Description

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

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

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

[0027] Figure 4 This is a flowchart of a particle electrode recovery method for wastewater treatment provided in an embodiment of the present invention;

[0028] Figure 5 This is a flowchart of another wastewater treatment particle electrode recovery method provided in an embodiment of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] Figure 1 This is a schematic diagram of a particle electrode recovery system for wastewater treatment provided in an embodiment of the present invention. (Refer to...) Figure 1The wastewater treatment particle electrode recovery system includes a wastewater treatment module 100, which includes a wastewater container 110 and a first electrode 120 and a second electrode 130 disposed in the wastewater container 110. The first electrode 120 is connected to one of the positive and negative terminals of a first power supply 140, and the second electrode 130 is connected to the other of the positive and negative terminals of the first power supply 140. The inlet of the wastewater container 110 is connected to a wastewater conveying pipeline L1, and the wastewater conveyed by the wastewater conveying pipeline L1 includes particle electrodes 10. The particle electrode recovery module 200 is connected to the outlet of the wastewater container 110 and is used to separate and recover the particle electrodes 10 in the wastewater treated by the wastewater treatment module 100.

[0031] The particle electrode recovery system for wastewater treatment in 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 unit of the crude oil extraction. The produced wastewater from the oil production unit 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 from the wastewater. The particle electrode recovery system for wastewater treatment in this embodiment can also be used for wastewater treatment in other situations besides crude oil extraction, but this embodiment does not specifically limit its application.

[0032] In this embodiment of the 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. It may also include a first power supply 140. Exemplarily, the positive terminal of the first power supply 140 is electrically connected to the first electrode 120, and the negative terminal of the first power supply 140 is electrically connected to the second electrode 130. In other optional embodiments of the invention, the negative terminal of the first power supply 140 is electrically connected to the first electrode 120, and the positive terminal 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. Since the wastewater includes particle electrodes 10, under the action of the electric field, the particle electrodes 10 become charged, thus forming independent microelectrodes. Therefore, during wastewater treatment, this 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 pollutant removal efficiency.

[0033] In this embodiment, the wastewater treatment particle electrode recovery system further includes a particle electrode recovery module 200. The particle electrode recovery module 200 is connected to the output port of the wastewater container 110. For example, wastewater is transported to the particle electrode recovery module 200 via a treated wastewater transport pipeline L2. The particle electrode recovery module 200 may include a particle electrode recovery container. 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, avoiding waste of the particle electrodes. The recovered particle electrodes can be used for electrochemical flooding or for further wastewater treatment, achieving full utilization of the particle electrodes and reducing wastewater treatment costs. The particle electrodes can be recovered using methods such as adsorption. For example, the particle electrode 10 is a magnetic particle electrode, such as an iron-based magnetic particle electrode. The particle electrode recovery module 200 may include a magnetic adsorption unit for adsorbing the magnetic particle electrodes. Optionally, the magnetic adsorption unit may include an electromagnetic adsorption plate.

[0034] The particle electrode recovery system for wastewater treatment in this embodiment forms a three-dimensional electrode system when the wastewater treatment module treats wastewater. This system consists of a first electrode, a second electrode, and particle electrodes in the wastewater, increasing the area of ​​the electrochemical reaction or forming a series of micro-electrolysis cells to improve pollutant removal efficiency. The particle electrode recovery module separates and recovers the particle electrodes from the wastewater after treatment, avoiding waste. The recovered particle electrodes can be reused, thereby achieving full utilization of the particle electrodes and reducing wastewater treatment costs.

[0035] Figure 2 This is a schematic diagram of another wastewater treatment particle electrode recovery system provided in an embodiment of the present invention, for reference. Figure 2Optionally, the wastewater treatment particle electrode recovery system 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 disposed in the injection well, and a fourth electrode 330 disposed in the production well, the third electrode 320 and the fourth electrode 330 being connected to the positive and negative terminals of a second power supply 340, respectively; the displacement fluid injection module 310 is used to deliver displacement fluid into the injection well, the displacement fluid including particle electrodes, and the production well is connected to... The produced fluid 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 the produced fluid delivered by the produced fluid delivery pipeline L3 into oil and water, and to 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 electrode to the displacement fluid injection module 310.

[0036] Specifically, the electrochemical oil recovery unit 300 employs electrochemical flooding for oil recovery. The displacement fluid injection module 310 of the electrochemical oil recovery unit 300 can inject displacement fluid into the injection well. A third electrode 320 is installed in the injection well, and a fourth electrode 330 is installed in the production well. The third electrode 320 is connected to the positive terminal of a second power supply 340, and the fourth electrode 330 is connected to the negative terminal of the second power supply 340. Thus, after the second power supply 340 is energized, an electric field is formed in the oil layer between the injection well and the production well, forming a two-dimensional electrode system. The second power supply 340 can be a DC power supply. The displacement fluid includes particle electrodes. After the displacement fluid is injected into the injection well, the third electrode 320, the fourth electrode 330, and the particle electrodes form a three-dimensional electrode system, thereby increasing the electrochemical reaction area and effectively displacing the extensive oil layer between the injection well and the production well, thus improving the oil recovery rate.

[0037] In this embodiment, the particle electrode recovery system further includes an oil-water separation module 400. Produced fluid from the well is transported to the oil-water separation module 400 via a produced fluid transport pipeline L3. The oil-water separation module 400 separates the produced fluid into oil and water. The first output port of the oil-water separation module 400 is connected to a wastewater transport pipeline L1, through which the separated wastewater is transported to a wastewater container 110 for further wastewater treatment. Optionally, the second output port of the oil-water separation module 400 is connected to a crude oil export pipeline L4, through which the separated crude oil is transported externally.

[0038] Because the displacing fluid contains particle electrodes, the wastewater separated from the produced fluid also contains particle electrodes. This allows for the establishment of a three-dimensional electrode system in the wastewater container 110 to remove pollutants from the wastewater. The treated wastewater is then transported to the particle electrode recovery module 200 for particle electrode recovery. The particle electrode recovery module 200 is connected to the displacing fluid injection module 310, so the recovered particle electrodes can be transported to the displacing fluid in the injection module 310. The displacing fluid can then be injected into the injection well. Thus, by recovering the particle electrodes and transporting them to the displacing fluid injection module 310, efficient utilization of the particle electrodes is achieved, avoiding waste. This approach improves oil recovery and wastewater pollutant removal efficiency by forming a three-dimensional electrochemical system, thereby reducing oil production costs and wastewater treatment costs.

[0039] Figure 3 This is a schematic diagram of another wastewater treatment particle electrode recovery system provided in an embodiment of the present invention, for reference. Figure 3 Optionally, the displacement fluid injection module includes a particle electrode container 311, a displacement fluid container 312, and a pump set 313. The particle electrode container 311 is connected to the particle electrode recovery module 200 through a particle electrode recovery pipeline L5. The particle electrode container 311 is also connected to the displacement fluid container 312 through a particle electrode delivery pipeline L6. The displacement fluid container 312 is connected to the pump set 313 through a first displacement fluid delivery pipeline L7. The pump set 313 is connected to the injection well through a 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 via the particle electrode recovery pipeline L5, thereby allowing the recovered particle electrodes to be transported to the particle electrode container 311 via the particle electrode recovery pipeline L5. The particle electrode container 311 is also connected to the displacement liquid container 312 via the particle electrode delivery pipeline L6, thereby allowing the particle electrodes to be delivered to the displacement liquid container 312 via the particle electrode delivery pipeline L6.

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

[0042] The displacement fluid injection module also includes a pump set 313, which includes at least one pump, and the pumps included in the pump set 313 can be high-pressure pumps. The displacement fluid in the displacement fluid container 312 is transported to the pump set 313 through the first displacement fluid delivery pipeline L7, and the pump set 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 towards the production well, thereby realizing the production of crude oil.

[0043] Continue to refer to Figure 3 Optionally, the wastewater treatment particle electrode recovery system also includes a wastewater outgoing pipeline L10, which is connected to the particle electrode recovery module 200 and is used to transport the wastewater after particle electrode recovery by the particle electrode recovery module 200 to the outside.

[0044] Wastewater outgoing pipeline L10 is connected to particle electrode recovery module 200. Particle electrode recovery module 200 may include one input port and two output ports. The input port of particle electrode recovery module 200 can be connected to wastewater container 110 through treated wastewater delivery pipeline L2. One of the output ports of particle electrode recovery module 200 is connected to particle electrode container 311 through particle electrode delivery pipeline L6, realizing the delivery of particle electrodes to particle electrode container 311. The other output port of particle electrode recovery module 200 is connected to wastewater outgoing pipeline L10, realizing the discharge of wastewater after particle electrode recovery.

[0045] Continue to refer to Figures 1-3 Based on the above technical solution, the first electrode 120 is positioned closer to the inlet of the wastewater container 110 than the second electrode 130, and the second electrode 130 is positioned closer to the outlet of the wastewater container 110 than the first electrode 120. That is, the first electrode 120 is positioned closer to the inlet of the wastewater container 110, and the second electrode 130 is positioned closer to the outlet of the wastewater container 110, which makes the electrochemical reaction area between the first electrode 120 and the second electrode 130 larger, increasing the reaction space and facilitating the effective removal of pollutants from the wastewater.

[0046] This invention also provides a method for recovering particle electrodes from wastewater treatment. Figure 4 This is a flowchart of a particle electrode recovery method for wastewater treatment provided in an embodiment of the present invention, see reference. Figure 4 The particle electrode recovery method for this wastewater treatment includes:

[0047] Step 510: An electric field is applied between the first electrode and the second electrode in the wastewater container through the first power source of the wastewater treatment module. The first electrode, the second electrode, and the particle electrode in the wastewater transported by the wastewater pipeline form 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 wastewater treatment particle electrode recovery method of this embodiment is applicable to the wastewater treatment particle electrode recovery system of any of the above embodiments of the present invention, and has the beneficial effects of the wastewater treatment particle electrode recovery system of any of the above embodiments of the present invention, which will not be repeated here.

[0050] Figure 5 This is a flowchart of another wastewater treatment particle electrode recovery method provided by an embodiment of the present invention. This wastewater treatment particle electrode recovery method can be applied to... Figure 2 and Figure 3 The wastewater treatment particle electrode recovery system shown is a reference. Figure 5 The particle electrode recovery method for this wastewater treatment includes:

[0051] Step 610: The produced fluid is separated into crude oil and wastewater through the oil-water separation module, and the wastewater is transported to the wastewater container.

[0052] Step 620: An electric field is applied between the first electrode and the second electrode in the wastewater container through the first power source of the wastewater treatment module. The first electrode, the second electrode, and the particle electrode in the wastewater transported by the wastewater pipeline form 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 delivers 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 delivers the produced fluid to the oil-water separation module.

[0055] After step 640 is completed, return to step 610 to achieve efficient utilization of the particle electrode in the entire system.

[0056] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which 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 includes a wastewater container and a first electrode and a second electrode disposed in the wastewater container. The first electrode is connected to one of the positive and negative terminals of a first power source, and the second electrode is connected to the other of the positive and negative terminals of the first power source. The inlet of the wastewater container is connected to a wastewater conveying pipeline, and the wastewater conveyed by the wastewater conveying pipeline includes particle electrodes. 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 after treatment by the wastewater treatment module. It also includes electrochemical oil recovery units and oil-water separation modules; The electrochemical oil recovery device includes a displacement fluid injection module, a third electrode disposed in the injection well, and a fourth electrode disposed in the production well. The third electrode and the fourth electrode are respectively connected to the positive and negative terminals of a second power source. The displacement fluid injection module is used to deliver displacement fluid into 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. 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 the produced fluid transported by the produced fluid transport pipeline into oil and water, and to transport the separated wastewater to the wastewater container through the wastewater transport pipeline. The particle electrode recovery module is connected to the displacement fluid injection module and is used to transport the recovered particle electrode to the displacement fluid injection module.

2. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that, 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.

3. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that, The displacement fluid injection module includes a particle electrode container, a displacement fluid container, and a pump set. 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 set through a first displacement fluid delivery pipeline. The pump set is connected to the injection well through a second displacement fluid delivery pipeline.

4. The particle electrode recovery system for wastewater treatment according to claim 3, characterized in that, The displacement fluid injection module also includes an injection water container, which is connected to the displacement fluid container via an injection water delivery pipeline.

5. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that, The second output port of the oil-water separation module is connected to the crude oil export pipeline.

6. 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 transport wastewater that has been recovered by the particle electrode recovery module to the outside.

7. The particle electrode recovery system for wastewater treatment according to claim 1, characterized in that, The first electrode is positioned relative to the second electrode near the inlet of the wastewater container, and the second electrode is positioned relative to the first electrode near the outlet of the wastewater container.

8. The particle electrode recovery system for wastewater treatment according to any one of claims 1-7, characterized in that, The particle electrode includes an iron-based magnetic particle electrode.

9. A method for recovering particulate electrodes from wastewater treatment, applicable to the particulate electrode recovery system for wastewater treatment as described in any one of claims 1-8, characterized in that, include: An electric field is applied between the first and second electrodes of the wastewater container by the first power source of the wastewater treatment module. The first electrode, the second electrode and the particle electrode in the wastewater transported by the wastewater pipeline form 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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