A high-salt hydrogen sulfide wastewater treatment device and its treatment process

Abstract

The present invention discloses a high-salt hydrogen sulfide wastewater treatment device and its treatment process, which includes an electrolytic cell, a hydrogen recovery tank, a tail gas monitoring component and a sulfur filtration component. The electrolytic cell is separated into a cathode area and an anode area by an inclined diaphragm. The cathode and anode are bifunctional catalysts of nickel foam supported transition metal sulfide. A number of anode electrodes are provided in the anode area and are connected to an anode switch timer to realize automatic switching of the anode working electrode. Cooperating with the anode switch timer to switch the working electrode can effectively avoid anode passivation and achieve continuous electrolysis. The present invention solves the industry problems such as easy passivation of the anode during the treatment of hydrogen sulfide wastewater by the direct electrolysis method, resulting in shutdown and the need for electrode regeneration process, and has good application prospects.

Description

Technical Field

[0001] The invention belongs to the field of wastewater treatment, and specifically relates to a high-salt hydrogen sulfide wastewater treatment device and a treatment process thereof. Background Art

[0002] In recent years, key industries such as petrochemicals, papermaking, plastics, textiles, and pesticides have flourished, but a series of environmental problems have also arisen, especially the large amount of high-salinity hydrogen sulfide wastewater with toxicity, corrosiveness, and a strong rotten egg smell generated during the production process. Therefore, it is of great significance to find appropriate methods to treat such wastewater.

[0003] At present, the processes for removing hydrogen sulfide from wastewater mainly include physical, biological and chemical methods. Among them, the physical method mainly separates volatile components such as hydrogen sulfide in wastewater by water vapor in a stripping tower. This method has problems such as easy scaling, high energy consumption, and easy secondary pollution. The biological method uses the new metabolism of microorganisms to convert H2S into relatively stable harmless substances, which has the advantages of environmental protection and energy saving. However, the salt content in high-salt hydrogen sulfide wastewater will inhibit the growth of microorganisms, thereby making the biological method too ineffective in treating high-salt hydrogen sulfide wastewater. Chemical methods include oxidation, precipitation and electrocatalytic oxidation. Among them, oxidation and precipitation require a large amount of oxidants and precipitants, and may cause secondary pollution.

[0004] In comparison, direct electrolysis has attracted widespread attention due to its advantages of low energy consumption, simple operation, and no secondary pollution. However, the existing electrolysis devices used to treat high-salinity hydrogen sulfide wastewater have the following problems: First, the sulfur generated at the anode during the electrolysis process will adhere to the electrode surface, causing electrode passivation problems. After a period of operation, the process needs to be suspended to replace the electrode. The sulfur attached to the electrode surface needs to be further processed, which increases the process cost and operation difficulty;

[0005] Second, it is difficult for existing devices to achieve the separation of H2 and H2S and the integration of tail gas treatment;

[0006] Third, high-salinity wastewater contains Cl - It is easy to cause the problem of Cl- poisoning of the catalyst, and there is a lack of catalysts with good resistance to Cl- poisoning and both hydrogen evolution activity and sulfur oxidation activity. Summary of the invention

[0007] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] In view of the above and / or problems existing in the prior art, the present invention is proposed.

[0009] Therefore, an object of the present invention is to overcome the deficiencies in the prior art and provide a high-salt hydrogen sulfide wastewater treatment device.

[0010] To solve the above technical problems, the present invention provides the following technical solutions: A high-salt hydrogen sulfide wastewater treatment device includes,

[0011] An electrolytic cell 1, a hydrogen recovery tank 2, a tail gas monitoring component 3, and a sulfur filtration component 4; wherein,

[0012] The electrolytic cell 1 includes a cathode region 6 and an anode region 7 separated from top to bottom by an inclined diaphragm 5; the cathode region 6 and the anode region 7 are connected through an external circuit 8, and the external circuit 8 includes a constant voltage DC power supply 15 and an anode switch timer 21 connected thereto;

[0013] In the cathode region 6, a sulfur-containing high-salt waste liquid inlet 9, a hydrogen gas outlet 10, and a cathode catalyst 11 are sequentially arranged from top to bottom. The cathode catalyst 11 is connected to a conductive metal rod 14 in a polytetrafluoroethylene insulating layer 13 through a fixture 12, and the conductive metal rod 14 is connected to the negative electrode of the power supply 15;

[0014] In the anode region 7, a tail gas outlet 16, an anode catalyst 18 fixed by a plurality of fixtures 17, a conductive rod 20 wrapped with an insulating layer 19, a hydrogen sulfide bubbling device 22, a sulfur-containing high-salt waste liquid inlet 23, and an outlet 24 are sequentially arranged from top to bottom; among them, the anode catalyst 18 is connected to the conductive rod 20, the conductive rod 20 is connected to the anode switch timer 21, and the hydrogen sulfide bubbling device 22 is arranged below the anode catalyst 18;

[0015] The tail gas monitoring component 3 includes a hydrogen sulfide tail gas monitoring device 25. Among them, the qualified tail gas 26 is directly discharged into the atmosphere, and the unqualified tail gas 27 enters the next process;

[0016] The sulfur filtration component 4 includes an anode liquid inlet 28 and a sulfur filter 29,

[0017] A one-way valve 38 is provided outside the electrolytic cell 1.

[0018] As a preferred scheme of the device of the present invention, wherein: the diaphragm 5 is an OH - Selective permeable membrane and is inclinedly arranged.

[0019] As a preferred scheme of the device of the present invention, wherein: the tail gas outlet 16 is arranged on the base 33 where the inclined diaphragm 5 is arranged.

[0020] As a preferred embodiment of the device of the present invention, wherein: the cathode catalyst 11 and the anode catalyst 18 are bifunctional catalysts with transition metal sulfides supported on nickel foam.

[0021] As a preferred embodiment of the device of the present invention, wherein: for the bifunctional catalyst, its preparation method includes,

[0022] Pre-treat nickel foam with HCl to obtain pre-treated nickel foam;

[0023] Dissolve ammonium fluoride, urea and one or more of iron nitrate, nickel nitrate, and cobalt nitrate in deionized water to obtain a mixed solution;

[0024] Put the pre-treated nickel foam and the mixed solution into a stainless steel autoclave, heat at 120 °C for 8 h to obtain a catalyst precursor;

[0025] After dissolving sodium sulfide in deionized water, place it with the catalyst precursor in a stainless steel reaction kettle, heat at 160 °C for 6 h, then wash with distilled water and ethanol in sequence, and dry to obtain the bifunctional catalyst.

[0026] As a preferred embodiment of the device of the present invention, wherein: an electromagnetic stirring device 34 is arranged below the electrolytic cell 1, and a magnetic stirrer 35 is arranged in the anode region 7.

[0027] As a preferred embodiment of the device of the present invention, wherein: the hydrogen sulfide bubbling device 22 is a hollow steel pipe with a "day" - shaped interconnected structure, and several small holes are opened on the steel pipe.

[0028] As a preferred embodiment of the device of the present invention, wherein: it further includes a waste liquid infusion pump 36, a hydrogen sulfide gas delivery pump 37, and an anode infusion pump 39.

[0029] Another object of the present invention is to overcome the deficiencies in the prior art and provide a process for treating high - salt hydrogen sulfide wastewater using the described device, which is characterized in that: it includes,

[0030] Transport the sulfur - containing high - salt wastewater to the cathode region 6 and the anode region 7 respectively through the liquid delivery pump 36 until the entire electrolytic cell 1 is filled, and turn on the stirring device 34;

[0031] Connect the constant - voltage DC power supply 15, control the electrolysis voltage at 0.5 - 10 V, and start the anode switch timer 21. Under the drive of the electrolysis voltage, the hydrogen generated by the hydrogen evolution reaction at the cathode enters the hydrogen recovery tank 2 for collection, and the generated OH - Enters the anode region 7 through the diaphragm 5;

[0032] Meanwhile, in the anode region, under the drive of the anode catalyst 18, S in the wastewater 2-Oxidized into sulfur and attached to the surface of the anode catalyst 18, the sulfur attached to the surface of the anode catalyst can react with OH- generated in the cathode region to form soluble polysulfide;

[0033] According to the concentration of hydrogen sulfide in the wastewater, the anode switch timer 21 is controlled to have a timing interval of 1-60 minutes. After the electrolysis reaches the timing interval, the switch is switched to the next working electrode to repeat the reaction and continue to remove hydrogen sulfide in the wastewater. 2- , while the sulfur covered in the working electrode before switching is in OH - Polysulfides are generated under the action until they are completely dissolved and then used in the next electrolysis process;

[0034] S in wastewater 2- After the treatment reaches the standard, the treated wastewater is transported to the sulfur filter 29 through the infusion pump 39, and industrial waste acid 30 is added for acidification. The sulfur generated by polysulfide is collected, and the hydrogen sulfide tail gas 31 is transported to the anode of the electrolytic cell by the gas pump 37;

[0035] The hydrogen sulfide gas 31 is converted into OH in the anode region 7. - After absorption, the tail gas is detected by a monitoring device 25, and the tail gas 26 that meets the standard is discharged into the atmosphere, and the tail gas 27 that does not meet the standard is transported to the anode area 7 together with hydrogen sulfide 31 to be absorbed again.

[0036] Beneficial effects of the present invention:

[0037] (1) The present invention utilizes the property of sulfur to generate polysulfide under alkaline conditions, by setting OH - The OH generated by the cathode reaction is selectively transmitted through the membrane - It is enriched in the anode area and cooperates with the switch timer to control the switching between the anode electrodes, thus achieving continuous and efficient removal of hydrogen sulfide in the wastewater without adding alkali. It solves the industry problems of direct electrolysis method for treating hydrogen sulfide wastewater, such as the easy passivation of the anode causing shutdown and the need for electrode regeneration process, and has good application prospects.

[0038] (2) The vertical electrolysis device of the present invention can not only increase the efficiency of the anode liquid in absorbing hydrogen sulfide tail gas, but also save floor space. The inclined diaphragm is conducive to the enrichment of hydrogen sulfide tail gas, and can effectively reduce the flow of anode liquid into the hydrogen sulfide tail gas monitoring device during the absorption process. At the same time, it is also conducive to separating H2 from the completely absorbed H2S, improving the quality of the collected hydrogen, and thus helping to improve the market competitiveness of the resource product hydrogen.

[0039] (3) The present invention directly introduces H2S generated by polysulfide regeneration into the anode area, thereby avoiding the problem of secondary pollution caused by H2S and not requiring additional adsorbent to be added, which is beneficial to saving process operation costs.

[0040] (4) The bifunctional catalyst proposed by the present invention has good resistance to Cl - poisoning, and also has hydrogen evolution activity and sulfur oxidation activity, and has great advantages in the treatment of high-salt hydrogen sulfide wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0042] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail in conjunction with the embodiments of the specification.

[0044] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar promotions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0045] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that mutually excludes other embodiments.

[0046] Embodiment 1

[0047] As Figure 1 shown, a device for resource treatment of high-salt hydrogen sulfide wastewater, which includes an electrolytic cell 1, an anode region 6, a cathode region 7, a hydrogen gas outlet 10, an anode region waste liquid inlet 9, an anode catalyst 11, a cathode fixture 12, a polytetrafluoroethylene insulating layer 13, a conductive rod 14, an OH− selective permeable membrane 5, a membrane fixing base 33, a tail gas outlet 16, an anode catalyst 18, an anode fixture 19, a "day"-shaped hydrogen sulfide bubbling absorption device 22, a magnetic stirrer 35, an anode waste liquid inlet 23, a waste liquid outlet 24, a constant voltage DC power supply 15, an anode switch timer 21, a hydrogen sulfide gas delivery pump 37, a one-way valve 38, a waste liquid infusion pump 36, an electromagnetic stirring device 34, a hydrogen recovery tank 2, a tail gas monitoring component 3, a hydrogen sulfide tail gas detection device 25, an anode liquid inlet 28, a sulfur filter 29, and an anode infusion pump 39.

[0048] Specifically, the device for resource treatment of high-salt hydrogen sulfide wastewater includes an electrolytic cell 1, a hydrogen recovery tank 2, a tail gas monitoring component 3, and a sulfur filtration component 4;

[0049] Further, as Figure 1 shown, the electrolytic cell 1 includes a cathode region 6, an anode region 7, and an external circuit 8 separated by an inclined diaphragm 5.

[0050] From top to bottom, the cathode region 6 is successively provided with a high-sulfur high-salt waste liquid inlet 9, a hydrogen gas outlet 10, a cathode catalyst 11. The catalyst 11 is connected to a conductive metal rod 14 in a polytetrafluoroethylene insulating layer 13 through a fixture 12, and the conductive metal rod 14 is connected to the negative electrode of a power supply 15.

[0051] From top to bottom, the anode region 7 is successively provided with a tail gas outlet 16, an anode catalyst 18 fixed by a plurality of fixtures 17. A conductive rod 20 wrapped with an insulating layer 19 is connected to one end of an anode switch timer 21, and the other end of the switch timer 21 is connected to the anode of the power supply 15. Below the catalyst 18, there is a "day"-shaped hydrogen sulfide bubbling device 22, a high-sulfur high-salt waste liquid inlet 23 and an outlet 24. An electromagnetic stirrer 34 is provided below the electrolytic cell, and a magnetic stir bar 35 is placed inside the anode region.

[0052] Example 2

[0053] Synthesize a bifunctional catalyst:

[0054] (1) Pretreat nickel foam with 3M HCl, dry it to obtain pretreated nickel foam.

[0055] (2) Hydrothermally synthesize a cobalt hydroxide precursor (Co(OH)2 / NF):

[0056] Accurately measure 40 ml of deionized water with a measuring cylinder and 750 μl of 2 mol / L Co(NO3)2 solution with a pipette;

[0057] Weigh 0.36 g of urea and 0.18 g of ammonium fluoride and place them in the above reaction kettle. Add a clean magnetic stir bar and stir for 10 minutes, then suck out the magnetic stir bar with a magnet. Use tweezers to pick up 3 pieces of pretreated and dried nickel foam and place them flat in the reaction kettle. After installing the outer jacket of the reaction kettle, carry out hydrothermal reaction at 120 °C for 12 hours;

[0058] Wash the prepared catalyst with distilled water and ethanol three times successively, and dry it at room temperature for use in the second step.

[0059] (3) Hydrothermally convert the above cobalt hydroxide into cobalt sulfide: accurately measure 40 ml of deionized water with a measuring cylinder, weigh 1.9 g of sodium sulfide and place it in a reaction kettle. Add a clean magnetic stirrer and stir for 10 minutes, then suck out the magnetic stirrer with a magnet. Use forceps to pick up 3 pieces of the above precursor sample Co(OH)2 / NF and place them flat in the reaction kettle. After installing the outer jacket of the reaction kettle, react at 160 °C for 6 hours by hydrothermal method;

[0060] Wash the prepared catalyst with distilled water and ethanol three times in sequence, and dry it for later use.

[0061] Example 3

[0062] The process for treating high-salt hydrogen sulfide wastewater includes the following steps:

[0063] S1: High-sulfur high-salt wastewater (H2S concentration is 34000 ppm, Cl - concentration is 40000 ppm) is respectively transported to the cathode area 6 and the anode area 7 by a liquid delivery pump 36 until the entire electrolytic cell 1 is filled, and the stirring device 34 is started;

[0064] S2: Connect a constant-voltage DC power supply 15, control the electrolysis voltage at 0.5 - 10 V, and start the anode switch timer 21. The hydrogen generated by the hydrogen evolution reaction at the cathode under the drive of the electrolysis voltage enters the hydrogen recovery tank 2 for collection, and the generated OH - enters the anode area 7 through the diaphragm 5; meanwhile, in the anode area, the S in the wastewater is oxidized into sulfur by the anode catalyst 18 and adheres to the surface of the anode catalyst 18. The sulfur adhering to the surface of the anode catalyst can react with the OH- generated in the cathode area to form soluble polysulfides. However, during the electrolysis process, the sulfur precipitation rate is still greater than the sulfur dissolution rate, and the long-term operation will cause passivation of the anode electrode; 2- 2-

[0065] S3: According to the hydrogen sulfide concentration in the wastewater, control the time interval of the anode switch timer 21 to be 1 - 60 min. After the electrolysis reaches the time interval, switch the switch to the next working electrode and repeat the S2 reaction to continue removing S in the wastewater 2- , and the sulfur covering the working electrode before switching generates polysulfides under the action of OH - until all of it is dissolved and then applied to the next electrolysis process;

[0066] S4: After the S in the wastewater 2- is treated up to standard, the treated wastewater is transported to the sulfur filter 29 by an infusion pump 39, and at the same time, industrial waste acid 30 is added for acidification. The sulfur generated from the polysulfides is collected, and the hydrogen sulfide tail gas 31 is transported to the anode of the electrolytic cell by a gas delivery pump 37,

[0067] S5: The hydrogen sulfide gas 31 in S4 is absorbed by OH- in the anode region 7. The tail gas is detected by the monitoring device 25. The qualified tail gas 26 is discharged into the atmosphere, and the unqualified tail gas 27 and the hydrogen sulfide 31 in step 5) are transported to the anode region 7 to be absorbed again.

[0068] Example 4

[0069] Similar to Example 3, the difference is that the high-sulfur high-salt wastewater (H2S concentration is 34000 ppm, Cl - concentration is 40000 ppm) is changed to sulfur-containing wastewater (H2S concentration is 34000 ppm).

[0070] Comparative Example 1

[0071] Similar to Example 3, the difference is that a commercial bifunctional catalyst (brand Adamas, product number 20149BC, purity 99.99%) is used.

[0072] Comparative Example 2

[0073] Similar to Example 4, the difference is that a commercial bifunctional catalyst (brand Adamas, product number 20149BC, purity 99.99%) is used.

[0074] It is found that there is no sulfur coverage on the anode region electrode after the operation and treatment of Examples 3 and 4 and Comparative Examples 1 and 2 reach the standard, indicating that the equipment and process of the present invention can effectively treat high-salt hydrogen sulfide-containing wastewater, and effectively solve the industrial problems that sulfur generated at the anode of the direct electrolysis process will adhere to the electrode surface, causing electrode passivation, resulting in shutdown and the need for subsequent treatment of the sulfur adhering to the electrode surface.

[0075] At the same time, the running time for Example 3 to reach the H2S emission standard is 1 / 10 of the running time of Comparative Example 1, indicating that the catalyst of the present invention has more excellent bifunctional catalytic activity.

[0076] The running time for Example 3 to reach the H2S emission standard is roughly the same as that of Example 4, while the running time for Comparative Example 2 to reach the H2S emission standard is significantly less than that of Comparative Example 1, indicating that even at a high Cl - concentration of 40000 ppm, the bifunctional activity of the bifunctional catalyst of the present invention remains unchanged, and it has good chlorine poisoning resistance compared with traditional commercial catalysts.

[0077] The present invention discloses a high-salt hydrogen sulfide wastewater treatment device and its treatment process, including an electrolytic cell, a hydrogen recovery tank, a tail gas monitoring component, and a sulfur filtration component. The electrolytic cell is divided into an anode area and a cathode area by an inclined diaphragm. The anode and cathode are bifunctional catalysts with transition metal sulfides supported on nickel foam. In the anode area, a number of anode electrodes are connected to an anode switch timer to achieve automatic switching of the anode working electrode. A bubbling device is provided below the electrode to absorb hydrogen sulfide tail gas. The high-sulfur high-salt wastewater enters the electrolytic cell, and the cathode generates the resource product hydrogen and OH - , OH - migrates to the anode area and combines with sulfur and S 2- precipitated on the anode surface to form soluble polysulfides. Coupled with the switching of the working electrode by the anode switch timer, it can effectively avoid anode passivation and achieve continuous electrolysis. The present invention solves the industry problems such as easy anode passivation causing shutdown and the need for electrode regeneration process in the treatment of hydrogen sulfide wastewater by direct electrolysis method, and has good application prospects.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the present invention.

Claims

1. A high-salt hydrogen sulfide wastewater treatment device, characterized in that: including, an electrolytic cell (1), a hydrogen recovery tank (2), a tail gas monitoring assembly (3) and a sulfur filtration assembly (4); wherein, The electrolytic cell (1) includes a cathode region (6) and an anode region (7) separated from top to bottom by an inclined diaphragm (5); the cathode region (6) and the anode region (7) are connected through an external circuit (8), and the external circuit (8) includes a constant voltage DC power supply (15) and an anode switch timer (21) connected thereto, and the diaphragm (5) is an OH - selective permeable membrane; in the cathode region (6), a high-sulfur-content high-salt waste liquid feed port (9), a hydrogen gas outlet (10) and a cathode catalyst (11) are sequentially arranged from top to bottom. The cathode catalyst (11) is connected to a conductive metal rod (14) in a polytetrafluoroethylene insulating layer (13) through a fixture (12), and the conductive metal rod (14) is connected to the negative electrode of a power supply (15); in the anode region (7), a tail gas outlet (16), an anode catalyst (18) fixed by a plurality of fixtures (17), a conductive rod (20) with an insulating layer (19) wrapped outside, a hydrogen sulfide bubbling device (22), a high-sulfur-content high-salt waste liquid inlet (23) and an outlet (24) are sequentially arranged from top to bottom. Among them, the anode catalyst (18) is connected to the conductive rod (20), the conductive rod (20) is connected to an anode switch timer (21), and the hydrogen sulfide bubbling device (22) is arranged below the anode catalyst (18); the tail gas monitoring assembly (3) includes a hydrogen sulfide tail gas monitoring device (25). Among them, the qualified tail gas (26) is directly discharged into the atmosphere, and the unqualified tail gas (27) enters the next process; the sulfur filtration assembly (4) includes an anode liquid feed port (28) and a sulfur filter (29), a one-way valve (38) is arranged outside the electrolytic cell (1).

2. The device according to claim 1, characterized in that: The tail gas outlet (16) is arranged on a base (33) where an inclined diaphragm (5) is installed.

3. The device according to claim 1, characterized in that: The cathode catalyst (11) and the anode catalyst (18) are bifunctional catalysts of nickel foam supported transition metal sulfide.

4. The device according to claim 3, characterized in that: For the bifunctional catalyst, its preparation method includes, pretreating nickel foam with HCl to obtain pretreated nickel foam; dissolving ammonium fluoride, urea and one or more of iron nitrate, nickel nitrate and cobalt nitrate in deionized water to obtain a mixed solution; putting the pretreated nickel foam and the mixed solution into a stainless steel autoclave, heating at 120 °C for 8 h to obtain a catalyst precursor; dissolving sodium sulfide in deionized water, putting it into a stainless steel reaction kettle with the catalyst precursor, heating at 160 °C for 6 h, then washing with distilled water and ethanol in sequence, and drying to obtain the bifunctional catalyst.

5. The device according to claim 1, characterized in that: An electromagnetic stirring device (34) is arranged below the electrolytic cell (1), and a magnetic stirrer (35) is arranged in the anode region (7).

6. The device according to claim 1, characterized in that: The hydrogen sulfide bubbling device (22) is a "day"-shaped hollow steel pipe with a plurality of small holes opened on the steel pipe.

7. The device according to claim 1, characterized in that: It also includes a waste liquid infusion pump (36), a hydrogen sulfide gas transmission pump (37) and an anode infusion pump (39).

8. A process for treating high-salt hydrogen sulfide wastewater using the device according to any one of claims 1 to 7, characterized in that: including, transporting the high-sulfur-content high-salt wastewater to the cathode region (6) and the anode region (7) respectively through a liquid delivery pump (36) until the entire electrolytic cell (1) is filled, and starting the stirring device (34); Connect the constant-voltage DC power supply (15), control the electrolysis voltage at 0.5 - 10 V, and start the anode switch timer (21). The hydrogen gas generated by the hydrogen evolution reaction at the cathode under the drive of the electrolysis voltage enters the hydrogen recovery tank (2) for collection, and the generated OH - enters the anode region (7) through the diaphragm (5); Meanwhile, in the anode region, under the drive of the anode catalyst (18), S in the wastewater is 2- oxidized into sulfur and adheres to the surface of the anode catalyst (18). The sulfur adhering to the surface of the anode catalyst can react with OH - generated in the cathode region to form soluble polysulfides; According to the hydrogen sulfide concentration in the wastewater, control the timing interval of the anode switch timer (21) to be 1 - 60 min. After the electrolysis reaches the timing interval, switch the switch to the next working electrode to repeat the reaction and continue to remove S in the wastewater 2- , while the sulfur covered in the working electrode before switching generates polysulfide under the action of OH - until it is completely dissolved and then applied to the next electrolysis process; S in the wastewater to be treated 2- After the treatment reaches the standard, the treated wastewater is transported into the sulfur filter (29) by a liquid infusion pump (39), and at the same time, industrial waste acid (30) is added for acidification. The sulfur generated from polysulfide is collected, while the hydrogen sulfide tail gas (31) is transported to the anode of the electrolytic cell by a gas delivery pump (37). Hydrogen sulfide tail gas (31) is absorbed by OH in the anode region (7). - The tail gas is detected by a monitoring device. The qualified tail gas (26) is discharged into the atmosphere, and the unqualified tail gas (27) is transported to the anode region (7) together with the hydrogen sulfide tail gas (31) for re-absorption.

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