Treatment system and treatment method for sulfides in printing and dyeing wastewater

Abstract

The invention relates to the technical field of sewage treatment systems, and provides a treatment system for sulfides in printing and dyeing wastewater aiming at the situation that traditional printing and dyeing wastewater easily affects a sewage treatment biochemical system, the treatment system comprises a hydrolysis acidification pool, a desulfurization pool and an alkaline spray tower; a packed bed is arranged in the hydrolysis acidification pool in a supporting manner, a first cover plate is arranged at the top of the hydrolysis acidification pool in a supporting manner, and the bottom of the hydrolysis acidification pool is filled with a biochemical sludge layer; the bottom and the top of the hydrolysis acidification pool are respectively communicated with a water inlet pipe and a water outlet pipe, and the water outlet pipe is communicated with the desulfurization pool; a plurality of spiral-flow aerators are arranged at the bottom of the desulfurization tank in a supporting manner; a second cover plate is supported at the top of the desulfurization tank and is communicated with an exhaust pipe, and the exhaust pipe is communicated with an air inlet of the alkaline spray tower through an air blower. The method has the effect of effectively removing sulfides in the printing and dyeing wastewater.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment systems, and in particular to a treatment system and method for sulfide in printing and dyeing wastewater. Background Art

[0002] Printing and dyeing wastewater usually contains a large amount of sulfide, which mainly comes from the dyeing auxiliaries added in the dyeing process and the sulfide component of the dye itself. At the same time, since flocculants such as ferrous sulfate and polyacrylamide are added to the printing and dyeing wastewater for flocculation and precipitation during the treatment process, the printing and dyeing wastewater contains a large amount of sulfate, and sulfate will produce a large amount of sulfide under anaerobic conditions.

[0003] When a large amount of sulfide flows through the sewage treatment system, it will not only inhibit the activity of methane bacteria, facultative aerobic bacteria, nitrite bacteria, nitrifying bacteria, etc. in the anaerobic pool of the sewage treatment system, but also easily reduce the enzyme activity of aerobic bacteria in the aerobic pool, and even cause the bacteria to lose activity or even die, resulting in slow degradation of pollutants such as organic matter and ammonia nitrogen; at the same time, the negative divalent sulfur ions in sulfide can be oxidized by oxygen into thiosulfate and sulfate, causing the oxygen demand of the aerobic pool to increase, and increasing the load and energy consumption of the aeration fan inside the aerobic pool. Sulfide has a great impact on the biochemical system of the sewage treatment system, so there is room for improvement. Summary of the invention

[0004] In order to remove sulfides in printing and dyeing wastewater in a timely manner, the present application provides a treatment system and method for sulfides in printing and dyeing wastewater.

[0005] The present application provides a system and method for treating sulfide in printing and dyeing wastewater, which adopts the following technical scheme: A treatment system for sulfide in printing and dyeing wastewater comprises a hydrolysis acidification tank, a desulfurization tank and an alkaline spray tower; a first cover plate is supported on the top of the hydrolysis acidification tank; a water inlet pipe and a water outlet pipe are respectively connected to the bottom and top of the hydrolysis acidification tank, and the water outlet pipe is connected to the desulfurization tank; a biochemical sludge layer is filled at the bottom of the hydrolysis acidification tank; a packing bed is supported in the hydrolysis acidification tank; a plurality of cyclone aerators are supported at the bottom of the desulfurization tank; a second cover plate is supported on the top of the desulfurization tank, the second cover plate is connected to an exhaust pipe, and the exhaust pipe is connected to an air inlet of the alkaline spray tower through a blower.

[0006] By adopting the above technical scheme, the printing and dyeing wastewater containing sulfide and sulfate is introduced into the hydrolysis acidification tank, and the sulfate decomposing bacteria in the hydrolysis acidification tank decompose the sulfate in the printing and dyeing wastewater to form sulfide. At the same time, the hydrolysis bacteria and acid-producing bacteria in the hydrolysis acidification tank decompose the organic matter in the printing and dyeing wastewater into volatile fatty acids, which can be used as electron donors by sulfate-reducing bacteria (SRB). After that, the printing and dyeing wastewater after hydrolysis and acidification in the hydrolysis acidification tank is continuously discharged into the desulfurization tank through the outlet pipe, and the cyclone aerator in the desulfurization tank is used to aerate and blow off the printing and dyeing wastewater, so that the sulfide in the printing and dyeing wastewater is converted from the liquid phase to the gas phase to form gaseous sulfide, and it is pumped into the alkaline spray tower by the blower for adsorption treatment. The effective removal of sulfide in the printing and dyeing wastewater is achieved, which is conducive to reducing the impact of sulfide in the subsequent printing and dyeing wastewater on the sewage treatment biochemical system.

[0007] Preferably, a water distribution assembly is further provided in the hydrolysis acidification tank, and the water distribution assembly includes a water distribution main pipe. The water inlet pipe is connected to the water distribution main pipe. The water distribution main pipe is radially connected to a plurality of water distribution branches, and the outer periphery of the water distribution branches is provided with a plurality of water outlet holes.

[0008] By adopting the above technical scheme, the printing and dyeing wastewater to be treated flows into the water distribution pipe through the water inlet pipe, then flows into various water distribution branches through the water distribution pipe, and is finally discharged through several water outlet holes on the water distribution branch pipe, which is conducive to full contact between the sewage and the microorganisms in the hydrolysis acidification tank.

[0009] Preferably, the hydrolysis acidification tank is supported with a plurality of first lifting drive members corresponding to the first cover plate, and the first lifting drive members are drivingly connected to the first cover plate for driving the first cover plate to be lifted and lowered vertically.

[0010] By adopting the above technical solution, the first cover plate driven by the first lifting drive member moves up and down to realize the opening and closing of the top pool opening of the hydrolysis acidification pool, which is convenient for the maintenance of the hydrolysis acidification pool during daily use.

[0011] Preferably, a connecting portion is provided at the bottom of the first cover plate, a connecting piece is provided at the top of the packing bed, and the first cover plate and the packing bed are connected and cooperated with the connecting portion through the connecting piece.

[0012] By adopting the above technical solution, on the one hand, the packing bed can be stably supported in the hydrolysis acidification tank, and on the other hand, when the first lifting drive member drives the first cover plate to move upward, the packing bed can be driven upward by the first cover plate, so as to facilitate the cleaning and replacement of the packing bed during subsequent use.

[0013] Preferably, an annular scraper plate is supported on the outer periphery of the bottom of the packing bed, and the outer periphery of the annular scraper plate is arranged in contact with the inner periphery of the hydrolysis acidification tank.

[0014] By adopting the above technical solution, when the subsequent lifting drive member drives the first cover plate to drive the packing bed to move upward, the packing bed can drive the annular scraper plate to scrape off the sludge impurities adhering to the side wall of the hydrolysis acidification tank, thereby cleaning the inner wall of the hydrolysis acidification tank.

[0015] Preferably, an annular baffle plate is connected to the inner periphery of the annular scraper plate, and the annular baffle plate is arranged higher than the annular scraper plate.

[0016] By adopting the above technical solution, the subsequent lifting drive member drives the first cover plate to drive the packing bed and the annular scraper plate to move upward, while the sludge impurities scraped off by the annular scraper plate can fall into the groove-shaped space formed by the inner wall of the hydrolysis acidification tank, the annular scraper plate and the annular baffle plate, and move out of the hydrolysis collection tank together with the packing bed, effectively limiting the sludge scraped off by the annular scraper plate from falling into the hydrolysis acidification tank, which is convenient for subsequent centralized cleaning.

[0017] Preferably, an end of the water outlet pipe close to the hydrolysis acidification tank is connected to an inflation pipe, the inflation pipe is in communication with an air source, and an opening and closing valve is also provided on the inflation pipe.

[0018] By adopting the above technical scheme, part of the sludge can be easily squeezed into the outlet pipe during the upward movement of the scraper plate; by setting the inflation pipe, the hydrolysis acidification tank is subsequently inflated through the inflation pipe to blow out the sludge impurities blocked in the outlet pipe, thereby reducing the situation where the outlet pipe is blocked by sludge impurities; by setting the opening and closing valve, the inflation pipe can be blocked by the opening and closing valve during the normal drainage of the outlet pipe, thereby limiting the entry of printing and dyeing wastewater into the inflation pipe.

[0019] A method for treating sulfide in printing and dyeing wastewater, using the above-mentioned sulfide treatment system in printing and dyeing wastewater, comprises the following steps: S1: Sulfide conversion: The printing and dyeing wastewater to be treated is passed into a hydrolysis acidification tank, and the sulfate carried in the printing and dyeing wastewater is reduced to form sulfide in the hydrolysis acidification tank; S2: Aeration stripping: The printing and dyeing wastewater in the hydrolysis acidification tank is discharged into the desulfurization tank through the outlet pipe, and the cyclone aerator at the bottom of the desulfurization tank is used to aerate and strip the printing and dyeing wastewater, so that the sulfide in the printing and dyeing wastewater is converted from liquid phase to gas phase; S3: Sulfide adsorption: The gaseous sulfide in the desulfurization pool is transferred to the alkaline spray tower through a blower, and the gaseous sulfide is absorbed by the alkaline spray tower.

[0020] By adopting the above technical scheme, the sulfate in the printing and dyeing wastewater is converted into sulfide through the hydrolysis acidification tank, and then the printing and dyeing wastewater is aerated and blown off through the desulfurization tank to convert the sulfide from the liquid phase to the gas phase. Finally, the gaseous sulfide is transferred to the alkaline spray tower by a blower for sulfide adsorption treatment, thereby achieving effective removal of sulfide from the printing and dyeing wastewater.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The sulfate in the printing and dyeing wastewater is first converted into sulfide by the sulfate-decomposing bacteria in the hydrolysis acidification tank, and then the printing and dyeing wastewater is aerated and blown off through the desulfurization tank to convert the sulfide into gaseous state, and then the gaseous sulfide in the desulfurization tank is transported to the alkaline spray tower for spraying treatment by the blower.

[0022] 2. By setting the annular scraper plate at the bottom of the packing bed, when the first cover plate drives the packing bed to move upward, the annular scraper plate can move upward with the packing bed, thereby scraping off the sludge impurities adhering to the inner side of the hydrolysis acidification tank, thereby cleaning the inner side of the hydrolysis acidification tank.

[0023] 3. By setting an air filling pipe near the hydrolysis acidification tank, compressed gas can be pumped into the outlet pipe through the air filling pipe to discharge the sludge blocked in the outlet pipe and reduce the situation where the outlet pipe is blocked by sludge impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the processing system used to illustrate the embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the internal structure of the hydrolysis acidification tank used in the embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the internal structure of the desulfurization tank used in the embodiment of the present application.

[0027] Figure 4 It is a schematic diagram used to illustrate the connection relationship between the first cover plate and the packing bed in an embodiment of the present application.

[0028] Figure 5 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0029] Description of reference numerals: 1. Hydrolysis acidification tank; 11. First cover plate; 111. Connecting plate; 112. Support plate; 10. First lifting cylinder; 12. Water inlet pipe; 13. Water outlet pipe; 131. Inflating pipe; 14. Biochemical sludge layer; 15. Filling bed; 150. Mounting plate; 151. Annular scraper plate; 152. Annular baffle plate; 16. Water distribution main pipe; 161. Water distribution branch pipe; 2. Desulfurization tank; 21. Second cover plate; 20. Second lifting cylinder; 22. Drain pipe; 23. Cyclone aerator; 24. Auxiliary air pipe; 25. Main air pipe; 3. Exhaust pipe; 31. Telescopic pipe; 4. Blower; 5. Alkaline spray tower. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-5 This application is described in further detail.

[0031] The present application embodiment discloses a system for treating sulfide in printing and dyeing wastewater, referring to Figures 1 to 3 , including a hydrolysis acidification tank 1, a desulfurization tank 2 and an alkaline spray tower 5; the bottom and top of the hydrolysis acidification tank 1 are respectively connected with an inlet pipe 12 and an outlet pipe 13; the outlet pipe 13 is connected to the desulfurization tank 2 at one end away from the hydrolysis acidification tank 1. The bottom of the hydrolysis acidification tank 1 is filled with a biochemical sludge layer 14, and hydrolytic bacteria, acid-producing bacteria and sulfate-reducing bacteria are attached to the biochemical sludge layer 14; a plurality of cyclone aerators 23 are arranged at the bottom of the desulfurization tank 2, and a drain pipe 22 is connected to the bottom of the desulfurization tank 2, and a through-and-off valve (not shown in the figure) is installed on the drain pipe 22; the top of the desulfurization tank 2 is connected with an exhaust pipe 3, and the exhaust pipe 3 is connected to the air inlet at the bottom of the alkaline spray tower 5 through a blower 4.

[0032] The printing and dyeing wastewater to be treated is first introduced into the hydrolysis and acidification tank 1, and the sulfate-reducing bacteria in the hydrolysis and acidification tank 1 are used to reduce the sulfate in the printing and dyeing wastewater to form sulfide. The hydrolysis and acidification printing and dyeing wastewater is then discharged into the desulfurization tank 2 through the outlet pipe 13. The printing and dyeing wastewater is aerated and blown off by a plurality of cyclone aerators 23 at the bottom of the desulfurization tank 2, so that the sulfide in the printing and dyeing wastewater is converted from liquid phase to gas phase to form gaseous sulfide, which is transferred and transported to the alkaline spray tower 5 by the blower 4, and the gaseous sulfide is adsorbed by the alkaline spray tower 5 to achieve effective removal of sulfide in the printing and dyeing wastewater.

[0033] Reference Figure 2 and Figure 4A water distribution component is also arranged in the hydrolysis acidification tank 1. The water distribution component is located between the bottom of the packing bed 15 and the biochemical sludge layer 14. The water distribution component includes a water distribution main pipe 16. The water distribution main pipe 16 is located at one end of the inner cavity of the hydrolysis acidification tank 1 and is connected to the water inlet pipe 12. The water distribution main pipe 16 is connected to a plurality of water distribution branches 161. The plurality of water distribution branches 161 are evenly distributed along the radial direction of the water distribution main pipe 16 and the water distribution branches 161 extend to the other end of the inner cavity of the hydrolysis acidification tank 1. A plurality of water outlet holes are evenly opened on the outer periphery of the water distribution branch pipe 161. Through the above arrangement, the subsequent printing and dyeing wastewater is discharged into the water distribution main pipe 16 through the water inlet pipe 12, and is discharged through the water outlet pipe 13 on each water distribution branch pipe 161; it is beneficial to allow the printing and dyeing wastewater entering the hydrolysis acidification tank 1 to be in uniform contact with the microorganisms in the hydrolysis acidification tank 1.

[0034] Reference Figure 1 A first cover plate 11 is also provided on the top of the hydrolysis acidification tank 1. The first cover plate 11 blocks the opening of the hydrolysis acidification tank 1. The hydrolysis acidification tank 1 is provided with a first lifting drive member corresponding to the first cover plate 11. The first lifting drive member includes four first lifting cylinders 10. The four first lifting cylinders 10 are grouped in pairs and are respectively located on both sides of the hydrolysis acidification tank 1. The tops of the first lifting cylinders 10 are all connected to the bottom of the first cover plate 11. Through the above arrangement, the first lifting cylinders 10 can be used to drive the first cover plate 11 to move up and down to realize the opening and closing of the top opening of the hydrolysis acidification tank 1, which is convenient for the subsequent cleaning and maintenance of the hydrolysis acidification tank 1.

[0035] Reference Figure 2 and Figure 5 The bottom of the first cover plate 11 and the top of the packing bed 15 are respectively provided with matching connecting members and connecting parts, the connecting members include two parallel connecting plates 111; the two connecting plates 111 are vertically connected to the supporting plates 112 on opposite sides; the connecting part includes two parallel hanging plates 150, the two hanging plates 150 are respectively connected to the opposite sides of the packing bed 15; the two hanging plates 150 are respectively overlapped on the two supporting plates 112. Through the above arrangement, the packing bed 15 is stably supported in the hydrolysis acidification tank 1. At the same time, when the subsequent first lifting drive member drives the first cover plate 11 to move up, the packing bed 15 can be moved up together with the first cover plate 11. After the packing bed 15 is moved out of the pool mouth of the hydrolysis acidification tank 1, the packing bed 15 can be slid out from between the two hanging plates 150 to separate the packing bed 15 from the first cover plate 11, which is convenient for the subsequent cleaning and replacement of the packing bed 15.

[0036] Reference Figure 2 and Figure 4An annular scraper plate 151 is arranged around the outer periphery of the bottom of the packing bed 15, and the annular scraper plate 151 is connected to the packing bed 15 through a plurality of connecting blocks; the packing bed 15 is firmly connected to the annular scraper plate 151, and the outer periphery of the annular scraper plate 151 is arranged to abut against the inner periphery of the hydrolysis acidification tank 1. When the packing bed 15 moves upward along with the first cover plate 11, the annular scraper plate 151 can be driven to move upward together. During the upward movement of the annular scraper plate 151, the sludge impurities adhering to the inner side of the hydrolysis acidification tank 1 can be scraped off, thereby cleaning the inner side of the hydrolysis acidification tank 1.

[0037] An annular baffle plate 152 is also welded to the inner periphery of the annular scraper plate 151, and the annular baffle plate 152 is vertically arranged with the annular scraper plate 151 and is higher than the annular scraper plate 151; subsequently, when the first cover plate 11 of the first lifting drive member moves upward to drive the packing bed 15 and the annular scraper plate 151 to move upward, the sludge impurities scraped off by the annular scraper plate 151 can fall into the temporary trough structure formed by the inner periphery of the hydrolysis acidification tank 1, the annular scraper plate 151 and the annular baffle plate 152, and finally move out of the hydrolysis acidification tank 1 with the packing tank, effectively limiting the sludge impurities scraped off by the annular scraper plate 151 from falling into the hydrolysis acidification tank 1.

[0038] One end of the water outlet pipe 13 close to the hydrolysis acidification tank 1 is connected to an air filling pipe 131, and the air filling pipe 131 is connected to an air source. After the annular scraper plate 151 moves upward to the hydrolysis acidification tank 1, compressed air can be pumped into the water outlet pipe 13 from the air source through the air filling pipe 131 to blow out the sludge impurities that enter the outlet pipe 13 due to the squeezing of the annular scraper plate 151 from the outlet pipe 13, thereby reducing the clogging of the water outlet pipe 13 by the sludge impurities.

[0039] An opening and closing valve (not shown in the figure) is also installed on the inflation pipe 131; when daily printing and dyeing wastewater flows into the desulfurization tank 2 through the outlet pipe 13, the inflation pipe 131 is blocked by the opening and closing valve to limit the printing and dyeing wastewater flowing through the outlet pipe 13 from flowing into the inflation pipe 131.

[0040] A main air pipe 25 is arranged at the bottom of the inner cavity of the desulfurization tank 2, and the main air pipe 25 is connected to the air source. The cyclone aerator 23 is connected to the main air pipe 25 through the auxiliary air pipe 24 to achieve the connection between the cyclone aerator 23 and the air source.

[0041] A second cover plate 21 is disposed on the top of the desulfurization tank 2 ; the second cover plate 21 covers the top tank opening of the desulfurization tank 2 .

[0042] The desulfurization tank 2 is provided with a second lifting drive member corresponding to the second cover plate 21. The second lifting drive member includes four second lifting cylinders 20. The four second lifting cylinders 20 are grouped in pairs and are located on opposite sides of the desulfurization tank 2; the piston rods of the second lifting cylinders 20 are all connected to the bottom of the second cover plate 21, so that the second lifting drive member is driven and connected to the second cover plate 21; subsequently, the second cover plate 21 is driven up and down by the lifting drive member to realize the opening and closing of the top pool port of the desulfurization tank 2, which is convenient for cleaning and maintenance of the desulfurization tank 2 during subsequent use.

[0043] The second cover plate 21 is provided with an exhaust port, which is connected to a telescopic tube 31 ; the telescopic tube 31 is connected away from the exhaust pipe 3 , and when the second lifting drive member subsequently drives the second cover plate 21 to move up and down, the telescopic tube 31 can be telescoped and deformed accordingly.

[0044] A method for treating sulfide in printing and dyeing wastewater, referring to Figures 1 to 3 , using the above-mentioned treatment system for sulfide in printing and dyeing wastewater, comprising the following steps: S1: Sulfide conversion: The printing and dyeing wastewater to be treated is introduced into the hydrolysis acidification tank 1 through the water inlet pipe 12, and the sulfate carried in the printing and dyeing wastewater is reduced to form sulfide by the sulfate-reducing bacteria in the hydrolysis acidification tank 1; at the same time, the organic matter in the printing and dyeing wastewater is decomposed by the hydrolytic bacteria and acid-producing bacteria in the hydrolysis acidification tank 1 to form volatile fatty acids for use by the sulfate-reducing bacteria.

[0045] S2: Aeration stripping: The printing and dyeing wastewater treated in the hydrolysis acidification tank 1 is discharged into the desulfurization tank 2 through the outlet pipe 13, and the printing and dyeing wastewater is aerated and stripped by a plurality of cyclone aerators 23 at the bottom of the desulfurization tank 2, so that the sulfide in the printing and dyeing wastewater is converted from liquid phase to gas phase and forms gaseous sulfide.

[0046] S3: Sulfide adsorption: The gaseous sulfide generated in the desulfurization tank 2 is transported to the spray tower by the blower 4 , sprayed into the alkaline spray tower 5 by the alkaline spray tower 5 , and the sulfide is absorbed by the alkaline spray tower 5 .

[0047] The sulfate in the printing and dyeing wastewater is reduced to form sulfide through the hydrolysis acidification tank 1, and then the printing and dyeing wastewater is aerated and stripped through the desulfurization tank 2 to convert the sulfide from the liquid phase to the gas phase. Finally, the sulfide is absorbed and treated by the alkaline spray tower 5, thereby effectively removing the sulfide in the printing and dyeing wastewater and reducing the situation in which the sulfide in the printing and dyeing wastewater affects the normal operation of the sewage treatment biochemical system during the subsequent printing and dyeing wastewater treatment process.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for treating sulfide in printing and dyeing wastewater, characterized in that: The invention comprises a hydrolysis acidification tank (1), a desulfurization tank (2) and an alkaline spray tower (5); a first cover plate (11) is supported on the top of the hydrolysis acidification tank (1); a water inlet pipe (12) and a water outlet pipe (13) are respectively connected at the bottom and top of the hydrolysis acidification tank (1), and the water outlet pipe (13) is connected to the desulfurization tank (2); a biochemical sludge layer (14) is filled at the bottom of the hydrolysis acidification tank (1); a packing bed (15) is supported inside the hydrolysis acidification tank (1); a plurality of cyclone aerators (23) are supported at the bottom of the desulfurization tank (2); a second cover plate (21) is supported on the top of the desulfurization tank (2), and the second cover plate (21) is connected to an exhaust pipe (3), and the exhaust pipe (3) is connected to the air inlet of the alkaline spray tower (5) through a blower (4).

2. A system for treating sulfides in printing and dyeing wastewater according to claim 1, characterized in that: A water distribution assembly is also provided in the hydrolysis acidification tank (1), the water distribution assembly comprising a water distribution main pipe (16), the water inlet pipe (12) being connected to the water distribution main pipe (16), the water distribution main pipe (16) being connected to a plurality of water distribution branch pipes (161) along its radial direction, and a plurality of water outlet holes are provided on the outer circumference of each of the water distribution branch pipes (161).

3. The system for treating sulfide in printing and dyeing wastewater according to claim 1, characterized in that: The hydrolysis acidification tank (1) is provided with a plurality of first lifting drive members corresponding to the first cover plate (11); the first lifting drive members are drivingly connected to the first cover plate (11) and are used to drive the first cover plate (11) to be lifted and lowered vertically.

4. A system for treating sulfides in printing and dyeing wastewater according to claim 3, characterized in that: A connecting portion is provided at the bottom of the first cover plate (11), a connecting piece is provided at the top of the packing bed (15), and the first cover plate (11) and the packing bed (15) are connected and matched with the connecting portion via the connecting piece.

5. A system for treating sulfides in printing and dyeing wastewater according to claim 4, characterized in that: An annular scraper plate (151) is supported on the outer periphery of the bottom of the packing bed (15), and the outer periphery of the annular scraper plate (151) is arranged in contact with the inner periphery of the hydrolysis acidification tank (1).

6. A system for treating sulfides in printing and dyeing wastewater according to claim 5, characterized in that: An annular material baffle plate (152) is connected to the inner periphery of the annular scraper plate (151), and the annular material baffle plate (152) is arranged higher than the annular scraper plate (151).

7. A system for treating sulfides in printing and dyeing wastewater according to claim 5, characterized in that: An end of the water outlet pipe (13) close to the hydrolysis acidification tank (1) is connected to an air filling pipe (131), the air filling pipe (131) is in communication with an air source, and an opening and closing valve is also provided on the air filling pipe (131).

8. A system for treating sulfides in printing and dyeing wastewater, using the system for treating sulfides in printing and dyeing wastewater according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Sulfide conversion: the printing and dyeing wastewater to be treated is introduced into a hydrolysis acidification tank (1), and the sulfate carried in the printing and dyeing wastewater is reduced to form sulfide in the hydrolysis acidification tank (1); S2: Aeration and stripping: The printing and dyeing wastewater in the hydrolysis and acidification tank (1) is discharged into the desulfurization tank (2) through the outlet pipe (13), and the printing and dyeing wastewater is aerated and stripped by using the cyclone aerator (23) at the bottom of the desulfurization tank (2), so that the sulfide in the printing and dyeing wastewater is converted from the liquid phase to the gas phase; S3: Sulfide adsorption: The gaseous sulfide in the desulfurization tank (2) is transferred to the alkaline spray tower (5) through the blower (4), and the gaseous sulfide is absorbed by the alkaline spray tower (5).

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