Treatment system for hydrogen peroxide production sewage

Abstract

The utility model discloses a treatment system for hydrogen peroxide production sewage and belongs to the technical field of sewage treatment. The device comprises a sewage collecting tank, a first oil separation tank and a first oil-water separator which are connected in sequence, the second oil separation tank, the second oil-water separator, the membrane separation device and the circulating water tank are connected in sequence, and the second oil separation tank is connected with the first oil-water separator; the Fenton oxidation pond, the biochemical pond, the sedimentation pond, the phosphorus removal pond and the clean water pond are connected in sequence, and the Fenton oxidation pond is connected with the membrane separation device; the device further comprises a working solution collecting tank and a preparation kettle, the working solution collecting tank is connected with the first oil-water separator, the second oil-water separator and the preparation kettle, and the preparation kettle is connected with the sewage collecting tank and the hydrogen peroxide production system. The hydrogen peroxide production sewage treatment device not only can reduce the treatment cost of hydrogen peroxide production sewage, but also can ensure that the sewage reaches the standard and is discharged.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a treatment system for wastewater from hydrogen peroxide production. Background Technology

[0002] Currently, the anthraquinone process is the mainstream technology for hydrogen peroxide production, its core being the synthesis of hydrogen peroxide through a redox cycle reaction. Wastewater generated from hydrogen peroxide production using the anthraquinone process mainly originates from system sludge discharge and organic wastewater generated after washing the working solution. Pollutants include: components of the working solution and their degradation products, phosphates, hydrogen peroxide, etc. The main pollutants in the wastewater are CODcr value and petroleum hydrocarbons.

[0003] Traditional methods for treating hydrogen peroxide production wastewater mainly employ a combination of the following technologies: neutralization with acid (such as sulfuric acid) or alkali (such as NaOH) to adjust pH; separation of oils and suspended particles through natural sedimentation or pressurized flotation; further removal of fine suspended solids using sand filtration or activated carbon filtration; addition of sodium sulfide (Na2S) or sodium hydroxide (NaOH) to form heavy metal sulfides or hydroxide precipitates; and reaction of H2O2 with Fe... 2 Combined use of flocculants to decompose recalcitrant organic matter; direct oxidation or catalytic ozone (such as TiO2 catalyst) to improve oxidation efficiency; activated carbon adsorption to remove residual organic matter. The above traditional hydrogen peroxide production wastewater treatment technologies suffer from problems such as requiring large amounts of hydrogen peroxide, acids, alkalis, ferrous sulfate, flocculants, etc., generating large amounts of solid waste, unstable treatment effects, high operating costs, and the inability to recycle wastewater. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a treatment system for hydrogen peroxide production wastewater. This invention can not only reduce wastewater treatment costs and recycle wastewater, but also ensure that wastewater is discharged in compliance with standards.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] The wastewater treatment system for hydrogen peroxide production includes:

[0007] The pretreatment unit includes a wastewater collection tank, a first oil separator, and a first oil-water separator connected in sequence.

[0008] The intermediate processing unit includes a second oil separator, a second oil-water separator, a membrane separation device, and a circulating water tank connected in sequence. The second oil separator is connected to the first oil-water separator.

[0009] The post-treatment unit includes a Fenton oxidation tank, a biochemical tank, a sedimentation tank, a phosphorus removal tank, and a clear water tank connected in sequence, wherein the Fenton oxidation tank is connected to the membrane separation device;

[0010] The auxiliary processing unit includes a working fluid collection tank and a preparation vessel. The working fluid collection tank is connected to the first oil-water separator, the second oil-water separator, and the preparation vessel, respectively. The preparation vessel is connected to the wastewater collection tank and the hydrogen peroxide production system, respectively.

[0011] Furthermore, the pretreatment unit also includes a first sewage transfer pump and a second sewage transfer pump; the first sewage transfer pump is connected to the sewage collection tank and the first grease trap via pipelines, and the first sewage transfer pump is located between the sewage collection tank and the first grease trap; the second sewage transfer pump is connected to the first grease trap and the first oil-water separator via pipelines, and the second sewage transfer pump is located between the first grease trap and the first oil-water separator.

[0012] Furthermore, the intermediate treatment unit also includes a third sewage transfer pump, a fourth sewage transfer pump, and a fifth sewage transfer pump; the third sewage transfer pump is connected to the second grease trap and the first oil-water separator via pipelines, and is located between the second grease trap and the first oil-water separator; the fourth sewage transfer pump is connected to the second grease trap and the second oil-water separator via pipelines, and is located between the second grease trap and the second oil-water separator; the fifth sewage transfer pump is connected to the second oil-water separator and the membrane separation device via pipelines, and is located between the second oil-water separator and the membrane separation device.

[0013] Furthermore, the post-treatment unit also includes a sixth wastewater transfer pump, a seventh wastewater transfer pump, an eighth wastewater transfer pump, and a first qualified wastewater transfer pump; the sixth wastewater transfer pump is connected to the Fenton oxidation tank and the biological treatment tank via pipelines, and is located between the Fenton oxidation tank and the biological treatment tank; the seventh wastewater transfer pump is connected to the biological treatment tank and the sedimentation tank via pipelines, and is located between the biological treatment tank and the sedimentation tank; the eighth wastewater transfer pump is connected to the sedimentation tank and the phosphorus removal tank via pipelines, and is located between the sedimentation tank and the phosphorus removal tank; the first qualified wastewater transfer pump is connected to the phosphorus removal tank and the clear water tank via pipelines, and is located between the phosphorus removal tank and the clear water tank.

[0014] Furthermore, the auxiliary processing unit also includes a first working fluid transfer pump, a second working fluid transfer pump, a third working fluid transfer pump, a ninth wastewater transfer pump, and a fourth working fluid transfer pump; the first working fluid transfer pump is connected to the first oil-water separator and the working fluid collection tank via pipelines, and is located between the first oil-water separator and the working fluid collection tank; the second working fluid transfer pump is connected to the working fluid collection tank and the preparation vessel via pipelines, and is located between the working fluid collection tank and the preparation vessel; the ninth wastewater transfer pump is connected to the preparation vessel and the wastewater collection tank via pipelines, and is located between the preparation vessel and the wastewater collection tank; the third working fluid transfer pump is connected to the preparation vessel and the hydrogen peroxide production system via pipelines, and is located between the preparation vessel and the hydrogen peroxide production system; the fourth working fluid transfer pump is connected to the working fluid collection tank and the second oil-water separator via pipelines, and is located between the working fluid collection tank and the second oil-water separator.

[0015] Furthermore, the wastewater treatment system for hydrogen peroxide production also includes a plate and frame filter press and a sludge storage yard. The feed inlet of the plate and frame filter press is connected to the sludge outlet of the Fenton oxidation tank, and the sludge discharge outlet of the plate and frame filter press is connected to the sludge storage yard.

[0016] Furthermore, the clear water tank is connected to the sewage treatment plant via a second qualified sewage transfer pump.

[0017] Furthermore, the first oil separator is a three-stage oil separator.

[0018] The beneficial effects of this utility model are:

[0019] This utility model discloses a wastewater treatment system for hydrogen peroxide production. First, the wastewater is collected in a wastewater collection tank, then undergoes physicochemical pretreatment in an oil separator to remove suspended solids. The wastewater then enters an oil-water separator to separate the working fluid components from the wastewater. Since no chemicals need to be added, and the separated working fluid contains some degradation products and impurities, the working fluid, after being processed in a preparation vessel, can be returned to the hydrogen peroxide production system for recycling, effectively improving the working fluid recovery rate and reducing costs. The wastewater after separating the working fluid components undergoes a secondary separation... After oil and oil-water separation, the water enters a membrane device to separate organic matter and salts. The resulting qualified water (approximately 80%) is reused as makeup water in the circulating water system, significantly improving wastewater recycling rates and effectively reducing costs. The concentrated water (approximately 20%) undergoes further treatment in a Fenton oxidation tank, biological treatment tank, sedimentation tank, and phosphorus removal tank, with the resulting qualified water entering a clear water tank. Because the volume of concentrated water is very small, it reduces the amount of chemicals needed, saving significant wastewater treatment chemical costs and reducing the generation of solid waste (sludge). Furthermore, the sludge produced in the Fenton oxidation tank is filtered and sent to a sludge disposal site. The main component of this sludge is iron oxide, which can be used as raw material in the finished brick manufacturing workshop, effectively recycling solid waste. Comparative experiments show that, compared to traditional treatment processes, the wastewater treatment cost of the modified hydrogen peroxide production wastewater treatment system using this invention is reduced by approximately 20 yuan per ton. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the system structure of a preferred embodiment of the present invention;

[0021] The labels in the attached diagram are as follows: 1-Wastewater collection tank; 2-First oil-water separator; 3-First oil-water separator; 4-Working fluid collection tank; 5-Preparation kettle; 6-Second oil-water separator; 7-Second oil-water separator; 8-Membrane separation device; 9-Circulating water tank; 10-Fenton oxidation tank; 11-Plate and frame filter press; 12-Biological treatment tank; 13-Sedimentation tank; 14-Phosphorus removal tank; 15-Clear water tank; 16-Wastewater treatment plant; 17-Sludge storage area; 101-First wastewater transfer pump; 102-Second wastewater transfer pump. Pumps; 103-First working fluid transfer pump; 104-Second working fluid transfer pump; 105-Third working fluid transfer pump; 106-Third sewage transfer pump; 107-Fourth sewage transfer pump; 108-Fifth sewage transfer pump; 109-Sixth sewage transfer pump; 110-Seventh sewage transfer pump; 111-Eighth sewage transfer pump; 112-First qualified sewage transfer pump; 113-Second qualified sewage transfer pump; 114-Ninth sewage transfer pump; 115-Fourth working fluid transfer pump. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Example

[0026] This embodiment provides a treatment system for hydrogen peroxide production wastewater, including a pretreatment unit, a mid-treatment unit, a post-treatment unit, and an auxiliary treatment unit, such as... Figure 1 As shown: The pretreatment section includes a wastewater collection tank 1, a first oil-water separator 2, and a first oil-water separator 3; the intermediate treatment section includes a second oil-water separator 6, a second oil-water separator 7, a membrane separation device 8, and a circulating water tank 9; the posttreatment section includes a Fenton oxidation tank 10, a biochemical tank 12, a sedimentation tank 13, a phosphorus removal tank 14, and a clear water tank 15; the auxiliary treatment section includes a working solution collection tank 4 and a preparation vessel 5; specifically:

[0027] The outlet of the wastewater collection tank 1 is connected to the inlet of the first oil separator 2. The outlet of the first oil separator 2 is connected to the inlet of the first oil-water separator 3. The wastewater outlet of the first oil-water separator 3 is connected to the inlet of the second oil separator 6. The working fluid outlet of the first oil-water separator 3 is connected to the inlet of the working fluid collection tank 4. The outlet of the working fluid collection tank 4 is connected to the inlet of the preparation vessel 5. The wastewater outlet of the preparation vessel 5 is connected to the inlet of the wastewater collection tank 1. The working fluid outlet of the preparation vessel 5 is connected to the vacuum dehydrator of the hydrogen peroxide production system. The outlet of the second oil separator 6 is connected to the inlet of the second oil-water separator 7. The working fluid outlet of the separator 7 is connected to the inlet of the working fluid collection tank 4; the wastewater outlet of the second oil-water separator 7 is connected to the feed inlet of the membrane separation device 8; the qualified water outlet of the membrane separation device 8 is connected to the inlet of the circulating water tank 9; the outlet of the circulating water tank 9 is connected to the heat exchange system of the hydrogen peroxide production device; the wastewater outlet of the membrane separation device 8 is connected to the inlet of the Fenton oxidation tank 10; the wastewater outlet of the Fenton oxidation tank 10 is connected to the inlet of the biochemical tank 12; the outlet of the biochemical tank 12 is connected to the inlet of the sedimentation tank 13; the outlet of the sedimentation tank 13 is connected to the inlet of the phosphorus removal tank 14; and the outlet of the phosphorus removal tank 14 is connected to the inlet of the clear water tank 15.

[0028] The hydrogen peroxide production wastewater treatment system of this embodiment first collects the hydrogen peroxide production wastewater, such as the sludge from the oxidation tower and the wastewater from the washing of the preparation vessel, into the wastewater collection tank 1. Then, the wastewater is transferred to the first oil separator 2, which is a three-stage oil separator. The wastewater undergoes physicochemical pretreatment in the three-stage oil separator to remove suspended solids from the process wastewater. After that, it is transferred to the first oil-water separator 3. The first oil-water separator 3 separates the working liquid components from the wastewater (since no reagents are needed, the separated working liquid components can be reused in the production unit after treatment). The separated working liquid components are pumped into the working liquid collection tank 4. At this time, the working liquid contains some degradation products and impurities and cannot be directly reused in the system. It needs to be sent to the preparation vessel 5. The working liquid is then deeply cleaned with pure water and pumped into the hydrogen peroxide device system (vacuum dehydrator) for reuse. The wastewater generated by the preparation vessel 5 is returned to the wastewater collection tank 1. After the first oil-water separator 3 separates the working fluid components, the remaining wastewater is pumped into the second oil-water separator 6 for treatment, and then transferred to the second oil-water separator 7. The working fluid components separated by the second oil-water separator 7 are returned to the working fluid collection tank 4 for collection. The wastewater after separating the working fluid components enters the membrane separation device 8 to separate organic matter and salts. The qualified water separated by the membrane separation device 8 (approximately 80% of the original wastewater volume) enters the circulating water tank 9 as fresh makeup water for reuse. It can also serve as a cold source for the entire hydrogen peroxide heat exchange system, effectively reducing the amount of fresh makeup water used. After separation by the membrane separation device 8... A small amount of concentrated wastewater (approximately 20% of the original wastewater volume) enters the Fenton oxidation tank 10. Due to separation by the membrane separation device 8, the wastewater production decreases by 80%, effectively reducing the amount of chemicals required in the Fenton oxidation tank 10, saving costs and reducing the overall wastewater discharge. Hydrogen peroxide, ferrous sulfate, and sodium hydroxide are added to the Fenton oxidation tank 10 for treatment. Because of the reduced wastewater volume, the amount of chemicals required is reduced by 70% compared to the original amount. The wastewater treated in the Fenton oxidation tank 10 then enters the biological treatment tank 12. The biological treatment tank 12 cultivates a large number of microorganisms suitable for treating this wastewater using a biofilm method. Through biochemical reactions, the COD of the wastewater is ensured. Cr The wastewater after the biochemical reaction in the biochemical tank 12 is transferred to the sedimentation tank 13 for sedimentation, and then transferred to the phosphorus removal tank 14. Ferrous sulfate or phosphorus removal agent is added to the phosphorus removal tank 14 for phosphorus removal treatment, and the qualified water is transferred to the clear water tank 15.

[0029] In this embodiment, the above-mentioned hydrogen peroxide production wastewater treatment system further includes a plate and frame filter press 11 and a sludge storage yard 17. The feed inlet of the plate and frame filter press 11 is connected to the sludge outlet of the Fenton oxidation tank 10, and the slag discharge outlet of the plate and frame filter press 11 is connected to the sludge storage yard 17, for example, via a conveyor belt. After the sludge produced by the Fenton oxidation tank 10 is dehydrated by the plate and frame filter press 11, it is transferred from the slag discharge outlet to the sludge storage yard 17 for storage. The main component of this sludge is iron oxide, which can be used as raw material to be sent to the finished brick workshop for finished brick production. In addition, because the wastewater generation is reduced by 80% after treatment by the membrane separation device 8, the amount of sludge generated is also effectively reduced.

[0030] In this embodiment, the clear water tank 15 is connected to the sewage treatment plant 16 via a second qualified sewage transfer pump 113. After the qualified water in the clear water tank 15 passes the inspection and meets the standards, it is pumped by the second qualified sewage transfer pump 113 to the sewage treatment plant 16 in the park, where it is uniformly discharged in a harmless manner.

[0031] In this embodiment, the pretreatment unit further includes a first sewage transfer pump 101 and a second sewage transfer pump 102. The first sewage transfer pump 101 is connected to the sewage collection tank 1 and the first grease trap 2 via pipes. The first sewage transfer pump 101 is located between the sewage collection tank 1 and the first grease trap 2. The sewage collected in the sewage collection tank 1 is pumped to the first grease trap 2 by the first sewage transfer pump 101. The second sewage transfer pump 102 is connected to the first grease trap 2 and the first oil-water separator 3 via pipes. The second sewage transfer pump 102 is located between the first grease trap 2 and the first oil-water separator 3. The sewage treated by the first grease trap 2 is pumped to the first oil-water separator 3 for further treatment by the second sewage transfer pump 102.

[0032] In this embodiment, the intermediate treatment unit further includes a third sewage transfer pump 106, a fourth sewage transfer pump 107, and a fifth sewage transfer pump 108. The third sewage transfer pump 106 is connected to the second grease trap 6 and the first oil-water separator 3 via pipelines. The third sewage transfer pump 106 is located between the second grease trap 6 and the first oil-water separator 3. The sewage separated by the first oil-water separator 3 is pumped by the third sewage transfer pump 106 to the second grease trap 6. The fourth sewage transfer pump 107 is connected to the second grease trap 6 and the second oil-water separator via pipelines. The fourth sewage transfer pump 107 is located between the second oil separator 6 and the second oil-water separator 7. Sewage treated by the second oil separator 6 is pumped to the second oil-water separator 7 by the fourth sewage transfer pump 107. The fifth sewage transfer pump 108 is connected to the second oil-water separator 7 and the membrane separation device 8 through pipelines. The fifth sewage transfer pump 108 is located between the second oil-water separator 7 and the membrane separation device 8. Sewage treated by the second oil-water separator 7 is pumped to the membrane separation device 8 by the fifth sewage transfer pump 108 for further treatment.

[0033] In this embodiment, the post-treatment unit further includes a sixth wastewater transfer pump 109, a seventh wastewater transfer pump 110, an eighth wastewater transfer pump 111, and a first qualified wastewater transfer pump 112. The sixth wastewater transfer pump 109 is connected to the Fenton oxidation tank 10 and the biological treatment tank 12 via pipelines. The sixth wastewater transfer pump 109 is located between the Fenton oxidation tank 10 and the biological treatment tank 12. Approximately 20% of the wastewater separated by the membrane separation device 8 is transferred to the Fenton oxidation tank 10 for treatment, and then the wastewater is pumped to the biological treatment tank 12 by the sixth wastewater transfer pump 109. The seventh wastewater transfer pump 110 is connected to the biological treatment tank 12 and the sedimentation tank 13 via pipelines. The seventh wastewater transfer pump 110 is located between the biological treatment tank 12 and the sedimentation tank 13. Between the two locations, the wastewater treated by the biological treatment tank 12 is pumped to the sedimentation tank 13 by the seventh wastewater transfer pump 110; the eighth wastewater transfer pump 111 is connected to the sedimentation tank 13 and the phosphorus removal tank 14 through pipelines, and the eighth wastewater transfer pump 111 is located between the sedimentation tank 13 and the phosphorus removal tank 14. The wastewater treated by the sedimentation tank 13 is pumped to the phosphorus removal tank 14 by the eighth wastewater transfer pump 111; the first qualified wastewater transfer pump 112 is connected to the phosphorus removal tank 14 and the clear water tank 15 through pipelines, and the first qualified wastewater transfer pump 112 is located between the phosphorus removal tank 14 and the clear water tank 15. The qualified wastewater obtained after treatment by the phosphorus removal tank 14 is pumped to the clear water tank 15 by the first qualified wastewater transfer pump 112.

[0034] In this embodiment, the auxiliary processing unit further includes a first working fluid transfer pump 103, a second working fluid transfer pump 104, a third working fluid transfer pump 105, a ninth wastewater transfer pump 114, and a fourth working fluid transfer pump 115. The first working fluid transfer pump 103 is connected to the first oil-water separator 3 and the working fluid collection tank 4 via pipelines. The first working fluid transfer pump 103 is located between the first oil-water separator 3 and the working fluid collection tank 4. The working fluid obtained after separation by the first oil-water separator 3 is pumped to the working fluid collection tank 4 by the first working fluid transfer pump 103. The second working fluid transfer pump 104 is connected to the working fluid collection tank 4 and the preparation vessel 5 via pipelines. The second working fluid transfer pump 104 is located between the working fluid collection tank 4 and the preparation vessel 5. The working fluid collected in the working fluid collection tank 4 is pumped to the preparation vessel 5 by the second working fluid transfer pump 104. The ninth wastewater transfer pump 114 is connected to the preparation vessel 5 and the wastewater collection tank via pipelines. 1. Connection: The ninth wastewater transfer pump 114 is located between the preparation vessel 5 and the wastewater collection tank 1. Wastewater discharged after treatment by the preparation vessel 5 is pumped by the ninth wastewater transfer pump 114 to the wastewater collection tank 1 for collection and subsequent treatment. The third working fluid transfer pump 105 is connected to the preparation vessel 5 and the hydrogen peroxide production system through pipelines. The third working fluid transfer pump 105 is located between the preparation vessel 5 and the hydrogen peroxide production system. The working fluid obtained after treatment by the preparation vessel 5 is pumped back to the hydrogen peroxide production system by the third working fluid transfer pump 105 for hydrogen peroxide production. The fourth working fluid transfer pump 115 is connected to the working fluid collection tank 4 and the second oil-water separator 7 through pipelines. The fourth working fluid transfer pump 115 is located between the working fluid collection tank 4 and the second oil-water separator 7. The working fluid obtained after treatment by the second oil-water separator 7 is pumped by the fourth working fluid transfer pump 115 to the working fluid collection tank 4 for collection, and then transferred to the preparation vessel 5 for subsequent treatment.

[0035] This invention can effectively reduce the treatment cost of hydrogen peroxide production wastewater while ensuring that the wastewater meets discharge standards. Tests have shown that the wastewater treatment cost of the modified hydrogen peroxide production wastewater treatment system using this invention decreases by approximately 20 yuan per ton.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A wastewater treatment system for hydrogen peroxide production, characterized in that, include: The pretreatment unit includes a sewage collection tank (1), a first oil separator (2), and a first oil-water separator (3) connected in sequence. The intermediate processing unit includes a second oil separator (6), a second oil-water separator (7), a membrane separator (8), and a circulating water tank (9) connected in sequence. The second oil separator (6) is connected to the first oil-water separator (3). The post-treatment unit includes a Fenton oxidation tank (10), a biochemical tank (12), a sedimentation tank (13), a phosphorus removal tank (14), and a clear water tank (15) connected in sequence. The Fenton oxidation tank (10) is connected to the membrane separation device (8). The auxiliary processing unit includes a working fluid collection tank (4) and a preparation vessel (5). The working fluid collection tank (4) is connected to the first oil-water separator (3), the second oil-water separator (7), and the preparation vessel (5). The preparation vessel (5) is connected to the sewage collection tank (1) and the hydrogen peroxide production system.

2. The wastewater treatment system for hydrogen peroxide production as described in claim 1, characterized in that: The pretreatment unit further includes a first sewage transfer pump (101) and a second sewage transfer pump (102); the first sewage transfer pump (101) is connected to the sewage collection tank (1) and the first oil separator (2) respectively through pipes, and the first sewage transfer pump (101) is located between the sewage collection tank (1) and the first oil separator (2); the second sewage transfer pump (102) is connected to the first oil separator (2) and the first oil-water separator (3) respectively through pipes, and the second sewage transfer pump (102) is located between the first oil separator (2) and the first oil-water separator (3).

3. The wastewater treatment system for hydrogen peroxide production as described in claim 1, characterized in that: The intermediate treatment unit also includes a third sewage transfer pump (106), a fourth sewage transfer pump (107), and a fifth sewage transfer pump (108); the third sewage transfer pump (106) is connected to the second grease trap (6) and the first oil-water separator (3) respectively through pipes, and the third sewage transfer pump (106) is located between the second grease trap (6) and the first oil-water separator (3); the fourth sewage transfer pump (107) is connected to the second grease trap (6) and the second oil-water separator (7) respectively through pipes, and the fourth sewage transfer pump (107) is located between the second grease trap (6) and the second oil-water separator (7); the fifth sewage transfer pump (108) is connected to the second oil-water separator (7) and the membrane separation device (8) respectively through pipes, and the fifth sewage transfer pump (108) is located between the second oil-water separator (7) and the membrane separation device (8).

4. The wastewater treatment system for hydrogen peroxide production as described in claim 1, characterized in that: The post-treatment unit further includes a sixth sewage transfer pump (109), a seventh sewage transfer pump (110), an eighth sewage transfer pump (111), and a first qualified sewage transfer pump (112); the sixth sewage transfer pump (109) is connected to the Fenton oxidation tank (10) and the biological treatment tank (12) respectively through pipelines, and the sixth sewage transfer pump (109) is located between the Fenton oxidation tank (10) and the biological treatment tank (12); the seventh sewage transfer pump (110) is connected to the biological treatment tank (12) and the sedimentation tank (13) respectively through pipelines, and the seventh sewage transfer pump (110) is connected to the biological treatment tank (12) and the sedimentation tank (13) respectively. The transfer pump (110) is located between the biological treatment tank (12) and the sedimentation tank (13); the eighth sewage transfer pump (111) is connected to the sedimentation tank (13) and the phosphorus removal tank (14) respectively through pipelines, and the eighth sewage transfer pump (111) is located between the sedimentation tank (13) and the phosphorus removal tank (14); the first qualified sewage transfer pump (112) is connected to the phosphorus removal tank (14) and the clear water tank (15) respectively through pipelines, and the first qualified sewage transfer pump (112) is located between the phosphorus removal tank (14) and the clear water tank (15).

5. The wastewater treatment system for hydrogen peroxide production as described in claim 1, characterized in that: The auxiliary processing unit further includes a first working fluid transfer pump (103), a second working fluid transfer pump (104), a third working fluid transfer pump (105), a ninth wastewater transfer pump (114), and a fourth working fluid transfer pump (115); the first working fluid transfer pump (103) is connected to the first oil-water separator (3) and the working fluid collection tank (4) respectively via pipelines, and the first working fluid transfer pump (103) is located between the first oil-water separator (3) and the working fluid collection tank (4); the second working fluid transfer pump (104) is connected to the working fluid collection tank (4) and the preparation vessel (5) respectively via pipelines, and the second working fluid transfer pump (104) is located between the working fluid collection tank (4) and the preparation vessel (5). The ninth sewage transfer pump (114) is connected to the preparation vessel (5) and the sewage collection tank (1) respectively through pipes, and the ninth sewage transfer pump (114) is located between the preparation vessel (5) and the sewage collection tank (1); the third working fluid transfer pump (105) is connected to the preparation vessel (5) and the hydrogen peroxide production system respectively through pipes, and the third working fluid transfer pump (105) is located between the preparation vessel (5) and the hydrogen peroxide production system; the fourth working fluid transfer pump (115) is connected to the working fluid collection tank (4) and the second oil-water separator (7) respectively through pipes, and the fourth working fluid transfer pump (115) is located between the working fluid collection tank (4) and the second oil-water separator (7).

6. The wastewater treatment system for hydrogen peroxide production as described in claim 1, characterized in that: The treatment system also includes a plate and frame filter press (11) and a sludge storage yard (17). The feed inlet of the plate and frame filter press (11) is connected to the sludge outlet of the Fenton oxidation tank (10), and the slag outlet of the plate and frame filter press (11) is connected to the sludge storage yard (17).

7. The wastewater treatment system for hydrogen peroxide production as described in claim 1, characterized in that: The clear water tank (15) is connected to the sewage station (16) via a second qualified sewage transfer pump (113).

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