Electrolysis equipment for electrolytic pollution control and hydrogen production of oilfield sewage

Abstract

The invention discloses electrolysis equipment for oil field sewage electrolysis pollution control and hydrogen production, and belongs to the technical field of oil field sewage electrolysis pollution control and hydrogen production. The electrolysis equipment comprises an electrolytic bath main body, a bipolar membrane separation assembly, an electrode assembly, a pulse power supply driving system, a circulating system and a gas collecting device, wherein the interior of the electrolytic bath main body is divided into an anode chamber and a cathode chamber through a bipolar membrane separation assembly; the anode chamber and the cathode chamber are each internally provided with three partition plates with the thickness of 2 mm, and four subareas with the length of 15 L are formed; the electrode assembly comprises an anode and a cathode; the anode is a titanium-based IrO2-RuO2 coating, and the thickness of the anode is 20 microns; the cathode is Ni-Mo alloy, the porosity is 60%, and the aperture is 50-100 microns; and the distance between the electrodes is 1.5 cm. The electrolysis equipment disclosed by the invention realizes collaborative optimization of efficient purification of oilfield sewage and hydrogen energy production, and has remarkable environmental benefits and energy value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production by electrolysis of oilfield wastewater, and more particularly to an electrolysis device for hydrogen production by electrolysis of oilfield wastewater. BACKGROUND

[0002] Oilfield wastewater is extremely difficult to treat due to its high salinity, high organic content, and heavy metal pollution, posing a major challenge in environmental governance and energy utilization. Traditional treatment methods such as chemical precipitation and biological treatment have significant limitations when dealing with oilfield wastewater. For example, chemical precipitation relies on a large amount of chemical agents, resulting in high costs and potential secondary pollution. Biological treatment is hindered by high salinity and complex components, leading to suppressed microbial activity and difficulty in meeting discharge standards. In addition, effective treatment of oilfield wastewater is not only related to environmental protection, but also closely related to the sustainable development of clean energy. Hydrogen energy, as a highly efficient and zero-emission energy source, has important significance for optimizing the energy structure through the advancement of hydrogen production technology. Therefore, developing an efficient and low-cost technology that can simultaneously achieve oilfield wastewater purification and hydrogen production not only has significant environmental benefits, but also has broad energy application prospects.

[0003] In the prior art, electrolytic technology has been widely explored for wastewater treatment and hydrogen production, and has shown its potential to some extent. For example, patent document CN115161676A proposes a seawater direct hydrogen production device, which realizes seawater hydrogen production through electrolytic technology, but its design is mainly aimed at seawater with low organic matter content, without considering the high organic matter and heavy metal pollution characteristics of oilfield wastewater, and the corrosion resistance and treatment efficiency of the electrode are difficult to meet the needs of oilfield wastewater, and double-membrane or pulse electrolysis technology is not used to improve efficiency. Patent CN119465196A discloses an electrolytic hydrogen production electrolytic cell, which uses a traditional single-cavity design and conventional electrode materials (such as titanium-based oxide anodes and nickel-based cathodes), but when treating high-salinity complex wastewater, the electrodes are easily corroded, with a service life usually less than 2000h, and the hydrogen production rate is low (<0.3L / h), making it difficult to achieve industrial application. Literature Sirés, I. et al. (2014) points out that the energy consumption of electrolytic technology in wastewater treatment is generally high (>5kWh / m³), and the stability of electrode materials is a key bottleneck limiting its large-scale application (Sirés, I., Brillas, E., Oturan, M. A., Rodrigo, M. A., & Panizza, M. (2014). Electrochemical Advanced Oxidation Processes: Today and Tomorrow. A Review. Environmental Science and Pollution Research, 21(14), 8336-8367. DOI: 10.1007 / s11356-014-2783-1). Similarly, Chen, Z. et al. (2021) studied the application of new electrode materials in hydrogen production, but did not involve double-membrane separation or pulse electrolysis optimization, making it difficult to be directly applicable to oilfield wastewater scenarios (Chen, Z., Wang, L., Wang, X., Wu, B., & Hu, B. (2021). Boron Nanosheet-Supported Rh Catalysts for Hydrogen Evolution: A New Territory for the Strong Metal-Support Interaction Effect. Nano-Micro Letters, 13, 138. DOI: 10.1007 / s40820-021-00662-y.).

[0004] Based on the above literature and patent analysis, existing electrolysis technologies face the following main problems and challenges in the combined application of oilfield wastewater treatment and hydrogen production: 1. Electrode materials are prone to corrosion and have a short lifespan. Traditional electrode materials (such as single titanium-based IrO2 anodes and pure nickel cathodes) are prone to corrosion in oilfield wastewater environments with high salinity and high organic content, resulting in equipment lifespan of less than 2000 hours, which cannot meet the requirements for long-term industrial operation.

[0005] 2. Low electrolysis efficiency and uneven electrolyte distribution. Existing electrolytic cells mostly adopt a single-cavity structure, resulting in uneven electrolyte flow and insufficient turbulence effect, which limits the efficiency of the electrolysis reaction. The COD (chemical oxygen demand) removal rate is usually only about 80%, which is difficult to meet the high standard purification requirements.

[0006] 3. High energy consumption and low hydrogen yield. Current electrolysis technologies generally consume more than 5 kWh / m³ of energy. 3 The hydrogen production rate is less than 0.3 L / h, which is not economically viable and makes it difficult to achieve the dual goals of environmental and energy benefits.

[0007] Therefore, how to develop an electrolysis device for treating and producing hydrogen from oilfield wastewater is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide an electrolysis device for treating and producing hydrogen from oilfield wastewater by electrolysis, so as to overcome the shortcomings of the prior art.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: An electrolysis device for treating and producing hydrogen from oilfield wastewater by electrolysis includes an electrolytic cell body, a bipolar membrane separator, an electrode assembly, a pulse power drive system, a circulation system, and a gas collection device. The interior of the electrolytic cell is divided into an anode chamber and a cathode chamber by a bipolar membrane partition assembly; each of the anode chamber and the cathode chamber is equipped with three 2mm thick partitions, forming four 15L partitions. The electrode assembly includes an anode and a cathode; the anode is a titanium-based IrO2-RuO2 coating with a thickness of 20 μm; the cathode is a Ni-Mo alloy with a porosity of 60% and a pore size of 50-100 μm; the electrode spacing is 1.5 cm.

[0010] The present invention is aimed at the technical needs in the field of oilfield sewage electrolysis pollution control and hydrogen production, and proposes an innovative electrolytic equipment structure optimization scheme. Through multi-stage partitioned electrolytic cell design, composite electrode material innovation, and dynamic circulation and flow guide system optimization, significant breakthroughs have been achieved in electrolysis efficiency, energy consumption reduction, equipment durability, and hydrogen production rate. The innovation, novelty, and creativity of the present invention will be elaborated in detail below, and its technical advantages will be fully described.

[0011] Analysis of the innovation, novelty, and creativity of the present invention: 1. Breakthrough in technical field: multi-stage partitioned electrolytic cell design (1) Innovation: Traditional electrolytic equipment mostly uses single-cavity electrolytic cell design, which results in uneven distribution of electrolyte, insufficient turbulent effect, and low electrolysis efficiency. The present invention first proposes a multi-stage partitioned electrolytic cell structure, which forms four independent partitions by setting three partitions in the electrolytic cell. This design significantly enhances the turbulent effect of the electrolyte, improves the contact efficiency between the electrolyte and the electrode, and thus increases the electrolysis reaction rate.

[0012] (2) Novelty: Compared with existing technologies such as patent CN115161676A (a seawater direct hydrogen production device) and CN119465196A (an electrolytic hydrogen production electrolytic cell), both of which use single-cavity design and do not involve partitioned structure. The multi-stage partitioned design of the present invention is unique in structure and has not been reported in existing patents or literature.

[0013] (3) Creativity: Through experimental verification, the multi-stage partitioned electrolytic cell increases the COD removal rate from 80% of traditional technology to 95%, and the electrolysis efficiency is increased by 20-25%. This breakthrough solves the technical problem of low electrolysis efficiency in oilfield sewage with high organic load, and exhibits high creativity.

[0014] 2. Innovation of composite electrode material (1) Anode innovation: Traditional anodes mostly use single titanium-based IrO2 coating, which has insufficient corrosion resistance in oilfield sewage with high salinity and high organic content, and the service life is usually only 2000h. The present invention uses an IrO2 (70wt%) - RuO2 (30wt%) composite coating anode, which utilizes the synergistic effect of the two materials to significantly improve the corrosion resistance and electrocatalytic activity.

[0015] (2) Performance improvement: The anode service life is extended from 2000h to 5000h, and the corrosion resistance is improved by 2 times.

[0016] (3) Cathode innovation: Traditional cathodes often use pure nickel material, which has low hydrogen evolution efficiency. The present invention introduces a Ni-Mo porous alloy cathode (Ni 90wt%, Mo 10wt%), which reduces the hydrogen evolution overpotential by 0.15V through the addition of Mo element, significantly improving the hydrogen production rate.

[0017] (4) Performance improvement: Hydrogen production rate increased from 0.3 L / h to 0.6 L / h, efficiency doubled; durability test showed that performance decayed less than 5% after 500h.

[0018] (5) Novelty and creativity: Patent CN119530842A proposes a single IrO2 coating anode, without involving composite material design; literature Chen, Z. et al. (2021) discusses a new cathode, but does not optimize for oilfield wastewater. The composite electrode material of the invention reflects significant innovation and creativity in terms of durability and catalytic efficiency.

[0019] 3. Dynamic circulation and flow guide optimization (1) Innovation: Traditional electrolysis equipment lacks efficient circulation system, electrolyte is prone to concentration polarization, increasing energy consumption. The invention introduces the combination of peristaltic pump and 30° inclined flow guide plate, optimizing the flow rate distribution of electrolyte, ensuring its uniform flow in the electrolytic cell.

[0020] (2) Performance improvement: Energy consumption decreased from 5kWh / m 3 of traditional technology to 4.2kWh / m 3 , with a decrease of 15%, significantly improving the operation economy.

[0021] (3) Novelty and creativity: Patent CN119433584A does not involve circulation system optimization, literature Sirés, I. et al. (2014) points out that high energy consumption of electrolysis technology is a common problem. The dynamic circulation and flow guide design of the invention effectively breaks through this bottleneck, with high novelty and creativity.

[0022] 4. Comprehensive innovation of the overall technical solution (1) Innovation: The invention integrates multi-stage partitioned electrolytic cell, composite electrode material and dynamic circulation system into one, forming a highly synergistic technical solution. This combined design is not reported in existing technology, reflecting systematic innovative thinking.

[0023] (2) Novelty: Through comparison with existing patents and literature, the multi-dimensional optimization of the invention is unique in structure and material.

[0024] (3) Creativity: The performance improvement (such as COD removal rate 95%, hydrogen production rate 0.6 L / h, energy consumption 4.2kWh / m 3 ) brought by the comprehensive design far exceeds traditional technology, showing technological progress and practical value.

[0025] Advantages of the invention: 1. Significant electrolysis efficiency improvement: The multi-stage partitioned electrolytic cell enhances the turbulent effect, increasing the COD removal rate from 80% to 95% and the hydrogen production rate from 0.3L / h to 0.6L / h. This high-efficiency electrolysis performance not only improves wastewater treatment effectiveness but also enhances the economic efficiency of hydrogen energy production.

[0026] 2. Energy consumption reduction and operation cost optimization: The dynamic circulation and optimized flow guide system make the electrolyte flow more uniform, reducing energy consumption from 5kWh / m 3 to 4.2kWh / m 3 , reducing operation costs by 15%. This provides significant economic advantages for industrial applications.

[0027] 3. Equipment durability and long-term stability: The introduction of composite electrode materials extends the anode life to 5000h, and the porosity of the cathode decreases from 60% to 58% after 500h of continuous operation, with a hydrogen production rate decay of less than 5%. The equipment is expected to have a service life of more than 2000h, reducing maintenance frequency and replacement costs.

[0028] 4. Environmental and energy double benefits: 1) Environmental protection: The equipment efficiently removes COD (95%) and heavy metals (such as Pb 2+ with a removal rate of 95%) from oilfield wastewater, significantly reducing pollution risks and outperforming traditional technologies. 2) Clean energy: The hydrogen production rate reaches 0.6L / h, providing support for the sustainable production of clean energy and achieving a win-win situation of resource utilization and energy conversion.

[0029] 5. Flexibility and adaptability: Through parameter optimization (such as electrode spacing 1.5cm, current density 25mA / cm 2 , NaCl concentration 5-8g / L), the equipment performs well under different working conditions, adapting to the complex composition of oilfield wastewater and having broad application potential.

[0030] 6. Feasibility of technology implementation: The equipment runs for 24h in actual oilfield wastewater (COD 500mg / L, NaCl 5g / L, Pb 2+ 10mg / L), reducing COD to 25mg / L, hydrogen production rate to 0.6L / h, and energy consumption to 4.2kWh / m 3 . These data fully verify the feasibility and superiority of the technology.

[0031] Further, the main body of the above-mentioned electrolytic cell is made of polytetrafluoroethylene (PTFE) material, with a temperature resistance of -50℃ to 200℃; the size is 50cm×30cm×40cm.

[0032] Further, the bipolar membrane separation assembly is composed of a cation exchange layer and an anion exchange layer, and the thickness is 0.2 mm. Further, the cation exchange layer is sulfonated polystyrene, and the anion exchange layer is quaternized polystyrene.

[0033] The further beneficial effect is that the electrolytic cell is divided into anode and cathode chambers by the bipolar membrane separation assembly (thickness 0.2 mm, composed of a cation exchange layer sulfonated polystyrene and an anion exchange layer quaternized polystyrene), and supplemented by three separators to form multiple stages, enhancing ion selectivity and turbulence effect.

[0034] Further, the coating includes IrO2 70wt% and RuO2 30wt%; the preparation process of the anode is that IrCl3 and RuCl3 are dissolved in isopropyl alcohol at a molar ratio of 7:3, 5wt% polyvinyl alcohol is added, coated on a titanium substrate, and then baked at 400°C for 2h.

[0035] The further beneficial effect is that the anode uses titanium-based IrO2 (70wt%) -RuO2 (30wt%) composite coating, and the corrosion resistance is improved by 2 times.

[0036] Further, the Ni-Mo alloy includes Ni 90wt% and Mo 10wt%; the preparation process of the cathode is that Ni powder and Mo powder are uniformly mixed, 10wt% polyethylene wax is added, and then sintered at 1100°C for 1h after compaction.

[0037] The further beneficial effect is that the cathode is a Ni-Mo porous alloy (Ni 90wt%, Mo 10wt%), and the hydrogen evolution efficiency is significantly improved.

[0038] Further, the frequency of the pulse power driving system is 1kHz, the duty cycle is 50%, and the peak voltage is 20V.

[0039] The further beneficial effect is that the pulse power frequency is 1kHz, the duty cycle is 50%, and the electrode polarization is reduced.

[0040] Further, the circulation system includes a peristaltic pump and a flow guide plate; the power of the peristaltic pump is 50W, the flow rate is 5-15L / min, and the preferred flow rate is 10L / min; the flow guide plate is made of polytetrafluoroethylene (PTFE) material, inclined at 30°, and 20cm long.

[0041] The further beneficial effect is that the circulation system realizes uniform flow of electrolyte through the synergistic effect of the peristaltic pump and the flow guide plate, and reduces the concentration polarization.

[0042] Furthermore, the aforementioned gas collection device includes a gas collection hood and an exhaust pipe; the gas collection hood is made of polypropylene (PP) and has a diameter of 30cm; the exhaust pipe is made of polyvinyl chloride (PVC) and has a diameter of 2cm.

[0043] The further beneficial effect of adopting the above-mentioned method is that the gas collection device is used to efficiently collect hydrogen gas produced by electrolysis.

[0044] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: This invention discloses an electrolysis device suitable for treating and producing hydrogen from oilfield wastewater containing 5-8 g / L NaCl, 500 mg / L COD, and heavy metal ions. It aims to solve the problems of electrode corrosion, high energy consumption, and low hydrogen yield in traditional electrolysis technologies. Tests show that when operating the device at a current density of 25 mA / cm² and an electrode spacing of 1.5 cm to treat oilfield wastewater (NaCl 5 g / L, COD 500 mg / L), the COD removal rate reaches 95%, and heavy metals (such as Pb) are also effectively removed. 2+ The removal rate is 95%, the hydrogen production rate is 0.6 L / h, the energy consumption is reduced to 4.2 kWh / m³, and the electrode life exceeds 5000 hours. This invention's electrolysis equipment achieves synergistic optimization of efficient oilfield wastewater purification and hydrogen production, demonstrating significant environmental benefits and energy value.

[0045] This invention significantly improves electrolysis efficiency, reduces energy consumption, and extends equipment lifespan through innovative multi-stage zoned electrolyzer design, composite electrode materials, and dynamic circulation and flow optimization. This invention not only solves the key technical bottlenecks of traditional electrolysis technology in oilfield wastewater treatment but also achieves efficient hydrogen production, providing an efficient, environmentally friendly, and economical solution for the resource utilization of oilfield wastewater and clean energy production. It has significant social implications and broad industrial application prospects. Attached Figure Description

[0046] Figure 1 These are two-dimensional top-view and three-dimensional schematic diagrams of the electrolysis equipment. Figure 2 The curve showing the relationship between hydrogen yield and electrode spacing; Figure 3 The curve showing the relationship between COD removal rate and current density; Figure 4 This is a curve showing the change in anodic coating thickness over operating time. Detailed Implementation

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. Embodiment 1

[0048] Assembly and performance test of electrolysis equipment (1) Assembly: electrolysis equipment for hydrogen production by electrolysis of oilfield sewage, including electrolytic cell main body, bipolar membrane separation assembly, electrode assembly, pulse power driving system, circulating system and gas collection device; Among them, the electrolytic cell main body is made of polytetrafluoroethylene material, with a size of 50cm×30cm×40cm, and a bipolar membrane separation assembly (thickness 0.2mm, cation exchange layer is sulfonated polystyrene, anion exchange layer is quaternary ammonium polystyrene) is installed inside to separate into anode and cathode chambers, each chamber is installed with 3 separators with a thickness of 2mm, forming 4 sub-zones with a volume of 15L; The electrode assembly includes an anode and a cathode, which are connected to the pulse power driving system (frequency 1kHz, duty cycle 50%, peak voltage 20V); a pair of electrodes are fixed in each sub-zone, and the size of the anode and the cathode is 20cm×15cm×0.2cm, with a spacing of 1.5cm; the anode is a titanium-based IrO2 (70wt%) -RuO2 (30wt%) coating with a thickness of 20μm, and the preparation process is as follows: IrCl3 and RuCl3 are dissolved in isopropyl alcohol at a molar ratio of 7:3, 5wt% polyvinyl alcohol is added, coated on a titanium substrate, and baked at 400℃ for 2h; the cathode is a Ni (90wt%) -Mo (10wt%) alloy with a porosity of 60% and a pore size of 50-100μm, and the preparation process is as follows: mix Ni powder and Mo powder, add 10wt% polyethylene wax, compact, and sinter at 1100℃ for 1h; The circulating system includes a peristaltic pump with a power of 50W and a flow rate of 10L / min, and a PTFE flow guide plate with an inclination of 30°, which is connected to the right side of the electrolytic cell; The gas collection device includes a polypropylene gas collection hood with a diameter of 30cm and a PVC exhaust pipe with a diameter of 2cm, which is installed on the top of the electrolytic cell.

[0049] Figure 1 The two-dimensional top view and three-dimensional view of the electrolysis equipment are shown, including the polytetrafluoroethylene (PTFE) electrolytic cell main body, the four sub-zones separated by three internal separators, the electrode assembly (the anode is represented in red and the cathode is represented in blue), the circulating system and the gas collection device. The labels of the anode and the cathode are located on the right side of the figure, and are marked with red and blue text respectively.

[0050] (2) Test conditions: electrolyte is oilfield wastewater (NaCl 5 g / L, COD 500 mg / L, Pb 2+ 10 mg / L, pH 7.5), current density 25 mA / cm2, running for 24 h.

[0051] (3) Results: COD reduced to 25 mg / L (removal rate 95%), Pb 2+ reduced to 0.5 mg / L (removal rate 95%), hydrogen production rate 0.6 L / h, power consumption 4.2 kWh / m 3 . Example 2

[0052] Optimization of electrode spacing and current density (1) Conditions: electrolyte is same as Example 1, test spacing 1 cm, 1.5 cm and 2 cm, current density 15-30 mA / cm2.

[0053] (2) Results: 1) Spacing 1 cm, 25 mA / cm2: COD removal rate 96%, hydrogen 0.65 L / h, power consumption 4.8 kWh / m3; 2) Spacing 1.5 cm, 25 mA / cm2: COD removal rate 95%, hydrogen 0.6 L / h, power consumption 4.2 kWh / m3; 3) Spacing 2 cm, 20 mA / cm2: COD removal rate 90%, hydrogen 0.5 L / h, power consumption 4.0 kWh / m3.

[0054] (3) Conclusion: Spacing 1.5 cm, current density 25 mA / cm2 is the best parameter (see Figure 2 , Figure 3 ).

[0055] Figure 2 The relationship between hydrogen production rate and electrode spacing (0.5-2.5 cm) is shown when the current density is fixed at 25 mA / cm2. The curve shows a downward trend, and when the electrode spacing increases from 0.5 cm to 2.5 cm, the hydrogen production rate gradually decreases from 0.70 L / h to 0.48 L / h. The best working point is marked as electrode spacing 1.5 cm, and the hydrogen production rate is 0.6 L / h, indicating that the equipment has achieved the best balance between hydrogen production rate and electrolysis efficiency at this spacing.

[0056] Figure 3The trend of COD removal rate changing with current density (15-30 mA / cm2) is shown under the condition that the electrode spacing is fixed at 1.5 cm. The curve shows an upward trend. When the current density increases from 15 mA / cm2 to 25 mA / cm2, the COD removal rate gradually increases from 88% to 95%, and then the growth slows down, and reaches 97% at 30 mA / cm2, close to saturation. The optimal working point is marked as current density 25 mA / cm2, and the COD removal rate is 95%, indicating that the device realizes efficient pollutant removal effect under this condition, while taking into account the energy consumption economy. Example 3

[0057] Effect of electrolyte composition (1) Condition: Adjust the concentration of NaCl (3 g / L, 5 g / L, 8 g / L), and the others are the same as in Example 1.

[0058] (2) Results: 1) 3 g / L: COD removal rate 88%, hydrogen 0.45 L / h; 2) 5 g / L: COD removal rate 95%, hydrogen 0.6 L / h; 3) 8 g / L: COD removal rate 96%, hydrogen 0.62 L / h.

[0059] (3) Conclusion: The appropriate range of NaCl is 5-8 g / L. Example 4

[0060] Electrode durability test (1) Condition: continuous operation for 500 h, spacing 1.5 cm, current density 25 mA / cm2.

[0061] (2) Results: The anode coating thickness decreases by 2 μm (10% loss), the cathode porosity decreases to 58%, the performance attenuation is less than 5%, and the life is expected to exceed 5000 h (see Figure 4 ).

[0062] Figure 4 The corrosion resistance of the IrO2 (70 wt%) -RuO2 (30 wt%) composite coating anode in the electrolytic device of the application is shown in the oilfield wastewater electrolysis environment (current density 25 mA / cm2, electrode spacing 1.5 cm). Compared with the traditional single IrO2 coating anode (lifetime about 2000 h, faster loss), the composite coating anode of the application only loses 50% within 5000 h, the life is prolonged by more than 2 times, and the excellent corrosion resistance is embodied.

[0063] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrolysis device for treating and producing hydrogen from oilfield wastewater, characterized in that, It includes the main body of the electrolytic cell, the bipolar membrane separator assembly, the electrode assembly, the pulse power drive system, the circulation system, and the gas collection device; The interior of the electrolytic cell body is divided into an anode chamber and a cathode chamber by a bipolar membrane partition assembly; each of the anode chamber and the cathode chamber is provided with three 2mm thick partitions, forming four 15L partitions; The electrode assembly includes an anode and a cathode; the anode is a titanium-based IrO2-RuO2 coating with a thickness of 20 μm; the cathode is a Ni-Mo alloy with a porosity of 60% and a pore size of 50-100 μm. Electrode spacing is 1.5cm.

2. The electrolysis equipment for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The main body of the electrolytic cell is made of polytetrafluoroethylene, which is resistant to temperatures from -50℃ to 200℃; its dimensions are 50cm×30cm×40cm.

3. The electrolysis equipment for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The bipolar membrane separator is composed of a cation exchange layer and an anion exchange layer, with a thickness of 0.2 mm.

4. The electrolysis equipment for treating and producing hydrogen from oilfield wastewater according to claim 3, characterized in that, The cation exchange layer is sulfonated polystyrene; the anion exchange layer is quaternized polystyrene.

5. An electrolysis device for treating and producing hydrogen from oilfield wastewater according to claim 3, characterized in that, The anion exchange layer is quaternized polystyrene.

6. The electrolysis equipment for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The coating comprises 70wt% IrO2 and 30wt% RuO2; the anode is prepared by dissolving IrCl3 and RuCl3 in isopropanol at a molar ratio of 7:3, adding 5wt% polyvinyl alcohol, coating the anode onto a titanium substrate, and then calcining it at 400°C for 2 hours.

7. An electrolysis device for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The Ni-Mo alloy comprises 90wt% Ni and 10wt% Mo; the cathode is prepared by mixing Ni powder and Mo powder, adding 10wt% polyethylene wax, compacting, and sintering at 1100℃ for 1 hour.

8. An electrolysis device for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The pulse power supply drive system has a frequency of 1kHz, a duty cycle of 50%, and a peak voltage of 20V.

9. An electrolysis device for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The circulation system includes a peristaltic pump and a baffle plate; the peristaltic pump has a power of 50W and a flow rate of 5-15L / min; the baffle plate is made of polytetrafluoroethylene, tilted at 30°, and 20cm long.

10. An electrolysis device for treating and producing hydrogen from oilfield wastewater according to claim 1, characterized in that, The gas collection device includes a gas collection hood and an exhaust pipe; the gas collection hood is made of polypropylene and has a diameter of 30cm; the exhaust pipe is made of polyvinyl chloride and has a diameter of 2cm.

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