Oxidation waste alkali liquor treatment device

Abstract

The utility model provides an oxidized waste alkali liquor treatment device which comprises a decarburization device, a heat exchange device, a density clarification device, a middle buffer device, a sand filter, an activated carbon filter and an ultrafiltration device which are connected in sequence, and the ultrafiltration device is connected with a waste gas treatment guide machine; the middle buffer device comprises a middle water tank, the bottom of the middle water tank is respectively connected with a water production lifting pump I and a water production lifting pump II through a water tank conveying pipeline and a water tank conveying pipeline I, and the water production lifting pump I and the water production lifting pump II are connected with a sand filter through an extraction pipeline; a middle water tank waste gas extraction pipeline is arranged at the top of the middle water tank; the whole structure is simplified, the flow difference between the flow and upstream and downstream procedures can be stabilized by arranging the middle buffer device, and it is ensured that the whole treatment device runs more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of waste alkali solution treatment, in particular to a device for treating oxidative waste alkali solution. Background Art

[0002] Oxidation waste alkali liquor is a type of waste generated in a specific industrial production process, mainly from the petrochemical, chemical fiber and other industries; for example, in the oil refining process, the alkali washing process is widely used to remove acidic impurities such as mercaptans and hydrogen sulfide in oil products. In this process, the alkali liquor (usually sodium hydroxide solution) reacts with the acidic substance. As the reaction proceeds, the effective ingredients in the alkali liquor are gradually consumed, and at the same time, some impurities are absorbed and entrained, thereby forming waste alkali liquor; in addition, in the production of chemical fibers, such as the production of polyester fibers, a certain amount of waste alkali liquor is also generated.

[0003] Ethylene is the foundation for the production of various important organic chemical products. The production technology, scale, and output of ethylene represent the level of development of a country's petrochemical industry. The waste lye generated during ethylene production is characterized by large water volumes and high pollutant concentrations, making it difficult to treat. Currently, wet air oxidation (WAO) is the most common method for treating ethylene cracking waste lye due to its high efficiency and removal efficiency. However, the chemical oxygen demand (COD) of the effluent from wet oxidation treatment of ethylene waste lye remains high, and the salt content can reach tens of thousands or hundreds of thousands of mg / L. Direct discharge not only causes significant water quality fluctuations in downstream biochemical systems, but also wastes resources such as the large amount of sulfate in the waste lye. Therefore, it is particularly important to treat the waste lye as a resource and efficiently recover the sulfate in it.

[0004] A method and device for treating oxidized waste alkali liquid with application number CN202310056443.1 discloses a device for treating oxidized waste alkali liquid, which includes a oxidized waste alkali liquid feed pipeline, a homogenization adjustment system, at least one stage of decarbonization and neutralization system, at least one stage of heat exchange system, a preheater, a high-density sedimentation tank system, a filtration system, an ultrafiltration system, and a crystallization system connected in sequence; the structure in this application is complex, and it cannot handle the flow fluctuations that may exist in the generation and treatment process of the oxidized waste alkali liquid, and cannot respond to emergencies.

[0005] In summary, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0006] The utility model provides an oxidation waste alkali liquid treatment device, comprising a decarbonization device, a heat exchange device, a density clarification device, an intermediate buffer device, a sand filter, an activated carbon filter, and an ultrafiltration device which are connected in sequence, and the ultrafiltration device is connected to a treatment waste gas duct; wherein, the intermediate buffer device comprises an intermediate water tank, and the bottom of the intermediate water tank is connected to a water production lifting pump 1 and a water production lifting pump 2 respectively through a water tank delivery pipeline and a water tank delivery pipeline 1, and the water production lifting pump 1 and the water production lifting pump 2 are connected to the sand filter through a production pipeline; an intermediate water tank waste gas production pipeline is provided on the top of the intermediate water tank.

[0007] As a preferred solution, the decarbonization device includes a decarbonization water production tank, which is connected to a feed pipeline, an air inlet is provided on the decarbonization water production tank, and a waste gas extraction pipeline is provided on the top of the decarbonization water production tank. Multiple outlets are provided on one side of the decarbonization water production tank, among which an outlet at the lower end is connected to a decarbonization water production lifting pump 1 and a decarbonization water production lifting pump 2 respectively through a decarbonization water production tank extraction pipeline 1 and a decarbonization water production tank extraction pipeline 2, and the decarbonization water production lifting pump 1 and the decarbonization water production lifting pump 2 are connected to the heat exchange device through the decarbonization water production lifting pump extraction pipeline.

[0008] As a preferred solution, the top of the decarbonization water production tank is connected to the decarbonization water production tank production pipeline 1 through the decarbonization water production tank material pipeline 1, and the top of the decarbonization water production tank is connected to the decarbonization water production tank production pipeline 2 through the decarbonization water production tank material pipeline 2.

[0009] As a preferred solution, the heat exchange device includes a pretreatment first-stage heat exchanger, a pretreatment second-stage heat exchanger, and a pretreatment third-stage heat exchanger connected in sequence. The pretreatment first-stage heat exchanger is connected to the decarbonization water production lift pump production pipeline, the output end of the pretreatment third-stage heat exchanger is connected to the pretreatment heat exchanger output pipeline, and the pretreatment heat exchanger output pipeline is connected to the density clarification device; the pretreatment second-stage heat exchanger is respectively connected to the circulating water supply main and the circulating water return main; the pretreatment third-stage heat exchanger is respectively connected to the external cooling heat exchanger and the refrigerant storage tank.

[0010] As a preferred solution, the density clarification device includes a high-density clarifier, the mixing zone of the high-density clarifier is connected to the output pipeline of the pretreatment heat exchanger, and the mixing zone is also connected to a flocculant dosing device through a flocculant feed pipeline; the flocculation zone of the high-density clarifier is connected to a dosing device through a drug feed pipeline; one side of the sedimentation zone of the high-density clarifier is connected to an intermediate water tank feed pipeline, the intermediate water tank feed pipeline is connected to the intermediate water tank, and the bottom of the sedimentation zone of the high-density clarifier is connected to a sludge outlet. The material pipeline one and the sludge discharge pipeline one are respectively connected to the sludge circulation pipeline one and the sludge pump, the sludge circulation pipeline one is respectively connected to the sludge circulation main pipeline and the sludge production main pipeline, the output end of at least one sludge pump is connected to the sludge circulation main pipeline one, and the sludge circulation main pipeline one is connected to the sedimentation area; the upper part of the mixing area and the sedimentation area is respectively connected to the waste gas production branch pipeline one and the waste gas production branch pipeline two, and the waste gas production branch pipeline one and the waste gas production branch pipeline two are respectively connected to the waste gas production main pipeline.

[0011] As a preferred solution, a second sludge discharge pipeline is further provided at the bottom of the sedimentation zone, the second sludge discharge pipeline is connected to one of the first sludge circulation pipelines, and the second sludge discharge pipeline is connected to a backwash pipeline.

[0012] As a preferred embodiment, the activated carbon filter includes filter 1 and filter 2. The top of filter 1 is connected to the output end of the sand filter through the filter feed pipeline, the bottom of filter 1 is connected to the top of filter 2 through filter 1 discharge pipeline 1, the bottom of filter 1 is connected to the wastewater extraction pipeline, the filter 1 discharge pipeline 1 is connected to filter 1 discharge pipeline 2, filter 1 discharge pipeline 2 is connected to a self-cleaning filter, and the output end of the self-cleaning filter is connected to an ultrafiltration device; the bottom of filter 2 is connected to the self-cleaning filter through filter 2 discharge pipeline 1 and filter 1 discharge pipeline 2, and the bottom of filter 2 is connected to the wastewater extraction pipeline through filter 2 discharge pipeline 2.

[0013] As a preferred solution, the bottoms of the filter 1 and the filter 2 are connected to a backwash water inlet pipeline, and the tops of the filter 1 and the filter 2 are connected to a backwash water outlet pipeline.

[0014] As a preferred solution, the top of the second filter is connected to the output end of the sand filter through a filter feed pipeline.

[0015] As a preferred solution, the self-cleaning filter includes a self-cleaning filter 1 and a self-cleaning filter 2 arranged in parallel.

[0016] The present application only sets up a heat exchange device and does not require a preheating device, which simplifies the overall structure. By setting up an intermediate buffer device, the process can be stabilized, and the flow difference between upstream and downstream processes can be adjusted to ensure that the operation of the entire treatment device is more stable. In addition, during the treatment process, if a link fails or requires temporary shutdown for maintenance, the intermediate buffer device can store a certain amount of waste alkali liquid, which buys time for troubleshooting, avoids accumulation or leakage of waste alkali liquid, and reduces production risks. More preferably, the activated carbon filter of the present application is set at two levels to better filter the waste liquid and can achieve regular flushing, thereby improving the filtering effect of the activated carbon filter, reducing the number of times the activated carbon is replaced, and thus reducing the overall operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the structural diagram of this application;

[0018] Figure 2 It is a structural schematic diagram of the intermediate buffer device of the present application;

[0019] Figure 3 It is a structural schematic diagram of the decarbonization device of the present application;

[0020] Figure 4 It is a structural schematic diagram of the heat exchange device of the present application;

[0021] Figure 5 It is a structural schematic diagram of the density clarification device of the present application;

[0022] Figure 6 It is a schematic structural diagram of the activated carbon filter of the present application;

[0023] Figure 7 It is a structural schematic diagram of the sand filter of the present application;

[0024] Reference numerals:

[0025] 1. Decarbonization device; 2. Heat exchange device; 3. Density clarifier; 4. Intermediate buffer device; 5. Sand filter; 6. Activated carbon filter; 7. Ultrafiltration device; 8. Waste gas treatment fan; 9. Intermediate water tank; 10. Water tank transmission pipeline; 11. Water tank transmission pipeline 1; 12. Water production lift pump 1; 13. Water production lift pump 2; 14. Production pipeline; 15. Intermediate water tank waste gas production pipeline; 16. Decarbonization water tank; 17. Feed pipeline; 18. Waste gas production pipeline; 19. Decarbonization water tank production pipeline 1 ; 20. Decarbonized water production tank production pipeline 2; 21. Decarbonized water production lifting pump 1; 22. Decarbonized water production lifting pump 2; 23. Decarbonized water production lifting pump production pipeline; 24. Decarbonized water production tank material pipeline 1; 25. Decarbonized water production tank material pipeline 2; 26. Pretreatment first-stage heat exchanger; 27. Pretreatment second-stage heat exchanger; 28. Pretreatment third-stage heat exchanger; 29. ​​Circulating water supply main; 30. Circulating water return main; 31. External cooling heat exchanger; 32. Refrigerant storage tank; 33. Input pipeline; 34. Output pipeline; 35. Pretreatment heat exchanger output pipeline; 36. High-density clarifier; 37. Mixing zone; 38. Flocculant feed pipeline; 39. Flocculant dosing device; 40. Flocculation zone; 41. Drug feed pipeline; 42. Dosing device; 43. Sedimentation zone; 44. Intermediate water tank feed pipeline; 45. Sludge discharge pipeline 1; 46. Sludge discharge pipeline 2; 47. Sludge circulation pipeline 1; 48. Sludge circulation main pipeline; 49. Sludge circulation main pipeline 1; 50. Sludge pump; 51. Sludge extraction main pipeline; 52. Backwash pipeline; 53. Waste gas extraction branch pipeline 1; 54. Waste gas extraction branch pipeline 2; 55. Waste gas extraction main pipeline; 56. Filter 1; 57. Filter 2; 58. Filter feed pipeline; 59. Filter 1 discharge pipeline 1; 60. Wastewater extraction pipeline; 61. Filter 1 discharge pipeline 2; 62. Self-cleaning filter 1; 63. Self-cleaning filter 2; 64. Filter 2 discharge pipeline 1; 65. Filter 2 discharge pipeline 2; 66. Backwash water inlet pipeline; 67. Backwash water outlet pipeline. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 To the attached Figure 7 The specific implementation of the present invention is described in detail. It should be noted that the specific implementation described herein is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0027] Example 1:

[0028] This embodiment provides an oxidation waste alkali liquid treatment device, comprising a decarbonization device 1, a heat exchange device 2, a density clarification device 3, an intermediate buffer device 4, a sand filter 5, an activated carbon filter 6, and an ultrafiltration device 7 connected in sequence, wherein the ultrafiltration device 7 is connected to a waste gas duct 8; the sand filter 5 (such as Figure 7 ), the ultrafiltration device 7 adopts equipment in the prior art, and the ultrafiltration device 7 adopts models such as UOF-4D, UOF-865, UOT-880 of Jinmo Technology. This application does not make any improvements to it. The specific technical personnel will choose according to the specific situation, and will not be described here; wherein, the intermediate buffer device 4 includes an intermediate water tank 9, and an intermediate water tank feed pipeline 44 is provided on one side of the intermediate water tank 9. The intermediate water tank feed pipeline 44 is connected to the output end of the density clarification device 3, and the bottom of the intermediate water tank 9 is connected to the water production lift pump 12 and the water production lift pump 2 13 through the water tank delivery pipeline 10 and the water tank delivery pipeline 11 respectively. The water production lifting pump 1 12 and the water production lifting pump 2 13 are connected to the sand filter 5 through the production pipeline 14; the top of the intermediate water tank 9 is provided with an intermediate water tank waste gas production pipeline 15, and the intermediate water tank waste gas production pipeline 15 produces waste gas; this embodiment simplifies the overall structure, and by providing an intermediate buffer device 4, it can stabilize the process and the flow difference between the upstream and downstream processes, ensuring that the operation of the entire treatment device is more stable; in addition, during the treatment process, if a link fails or requires temporary shutdown for maintenance, the intermediate buffer device 4 can store a certain amount of waste alkali liquid, which buys time for troubleshooting, avoids accumulation or leakage of waste alkali liquid, and reduces production risks.

[0029] Example 2:

[0030] The present embodiment illustrates the decarbonization device 1, which includes a decarbonization water production tank 16. The decarbonization water production tank 16 is connected to a feed pipeline 17. The oxidized waste alkali liquid enters the decarbonization water production tank 16 through the feed pipeline 17. The oxidized waste alkali liquid can come from a wastewater pool, a secondary neutralizer, an ultrafiltration wastewater pool, etc. The decarbonization water production tank 16 is provided with an air inlet, and a waste gas extraction pipeline 18 is provided on the top of the decarbonization water production tank 16. A plurality of outlets are provided on one side of the decarbonization water production tank 16, wherein an outlet at the lower end is connected to the decarbonization water production tank through a decarbonization water production tank extraction pipeline 19 and a decarbonization water production tank extraction pipeline 20 respectively. The water lifting pump 1 21 and the decarbonization water production lifting pump 2 22 are connected, and the decarbonization water production lifting pump 1 21 and the decarbonization water production lifting pump 2 22 are connected to the heat exchange device 2 through the decarbonization water production lifting pump production pipeline 23; the top of the decarbonization water production tank 16 is connected to the decarbonization water production tank production pipeline 1 19 through the decarbonization water production tank material pipeline 1 24, and the top of the decarbonization water production tank 16 is connected to the decarbonization water production tank production pipeline 2 20 through the decarbonization water production tank material pipeline 2 25. The material after decarbonization in the decarbonization water production tank 16 is produced into the heat exchange device 2 through the decarbonization water production tank material pipeline 1 24 and the decarbonization water production tank material pipeline 2 25.

[0031] The oxidized waste alkali liquid contains gas components such as carbon dioxide that need to be removed. The oxidized waste alkali liquid enters the decarbonization water production tank 16 through the feed pipeline 17. The decarbonization water production tank 16 can be fed with auxiliary gas through the air inlet, the purpose of which is to promote gas-liquid contact and reaction during the decarbonization process. Because the oxidized waste alkali liquid itself has a certain alkalinity, when the carbon dioxide gas and the oxidized waste alkali liquid are fully in contact in the decarbonization water production tank 16, a chemical reaction will occur, realizing the transfer of carbon dioxide from the gas phase to the liquid phase, thereby achieving the purpose of preliminary decarbonization. After the decarbonization reaction has been carried out for a period of time, the liquid in the decarbonization water production tank 16 will be stratified due to changes in composition and other reasons. The decarbonization water production tank 16 is connected to the decarbonization water production tank 16 through the corresponding outlet. The outlet is used to separate the decarbonized liquid into layers, and the relatively clear water produced in the upper layer is discharged and collected through the corresponding outlet, and the liquid in the lower layer containing more reaction products is introduced into the heat exchange device 2 through the decarbonization water production tank production pipeline 19, the decarbonization water production tank production pipeline 20, and the decarbonization water production lifting pump production pipeline 23 for further treatment; on the other hand, the gas phase produced from the top through the decarbonization water production tank material pipeline 1 24 and the decarbonization water production tank material pipeline 2 25 is condensed and respectively led out to the decarbonization water production lifting pump production pipeline 23 through the decarbonization water production lifting pump 1 21 and the decarbonization water production lifting pump 22, and introduced into the heat exchange device 2 through the decarbonization water production lifting pump production pipeline 23 for further treatment.

[0032] Example 3:

[0033] This embodiment illustrates the heat exchange device 2. Specifically, the heat exchange device 2 includes a pretreatment first-stage heat exchanger 26, a pretreatment second-stage heat exchanger 27, and a pretreatment third-stage heat exchanger 28 connected in sequence. The pretreatment first-stage heat exchanger 26 is connected to the decarbonization water production lift pump production pipeline 23. The output end of the pretreatment third-stage heat exchanger 28 is connected to the pretreatment heat exchanger output pipeline 35, and the pretreatment heat exchanger output pipeline 35 is connected to the density clarification device 3.

[0034] The pretreatment first-stage heat exchanger 26, the pretreatment second-stage heat exchanger 27, and the pretreatment third-stage heat exchanger 28 are preferably arranged in the pretreatment plant. The pretreatment second-stage heat exchanger 27 is respectively connected to the circulating water supply pipe 29 and the circulating water return pipe 30, and the cold medium of the pretreatment second-stage heat exchanger 27 is circulating water; the pretreatment third-stage heat exchanger 28 is respectively connected to the external cooling heat exchanger 31 and the refrigerant storage tank 32, and the cold medium of the pretreatment third-stage heat exchanger 28 is refrigerant; the pretreatment first-stage heat exchanger 26 can be connected to the pre-concentration second-stage heat exchanger through the input pipeline 33, and connected to the pre-concentration third-stage heat exchanger through the output pipeline 34. The medium at the outlet end of the pre-concentration second-stage heat exchanger enters the pretreatment first-stage heat exchanger 26, and the medium after heat exchange enters the pre-concentration third-stage heat exchanger; the liquid after heat exchange in the third-stage heat exchanger enters the density clarification device 3.

[0035] Example 4:

[0036] This embodiment describes the density clarification device 3, specifically:

[0037] The density clarification device 3 includes a high-density clarifier 36, a mixing zone 37 of the high-density clarifier 36 is connected to the pretreatment heat exchanger output pipeline 35, and the mixing zone 37 is also connected to a flocculant dosing device 39 through a flocculant feed pipeline 38; the material passing through the pretreatment three-stage heat exchanger 28 enters the mixing zone 37 of the high-density clarifier 36, and undergoes flocculation reaction with the flocculant added by the flocculant dosing device 39; the flocculation zone 40 of the high-density clarifier 36 is connected to a dosing device 42 through a drug feed pipeline 41, and the dosing device 42 adopts a PAM dosing device; one side of the sedimentation zone 43 of the high-density clarifier 36 is connected to an intermediate water tank feed pipeline 44, and the material extracted from the intermediate water tank feed pipeline 44 enters the intermediate water tank 9; the sedimentation zone 4 The bottom of 3 is connected to a sludge discharge pipeline 45, which is respectively connected to a sludge circulation pipeline 47 and a sludge pump 50, and the sludge circulation pipeline 47 is respectively connected to a sludge circulation main pipeline 48 and a sludge extraction main pipeline connection 51; the output end of at least one sludge pump 50 is connected to a sludge circulation main pipeline 49, and the sludge circulation main pipeline 49 is connected to the sedimentation zone 43; the upper parts of the mixing zone 37 and the sedimentation zone 43 are respectively connected to a waste gas extraction branch pipeline 53 and a waste gas extraction branch pipeline 2 54, and the waste gas extraction branch pipeline 53 and the waste gas extraction branch pipeline 2 54 are respectively connected to the waste gas extraction main pipeline 55, and the waste gas extracted from the mixing zone 37 and the sedimentation zone 43 is discharged through the waste gas extraction main pipeline 55 and enters the subsequent treatment stage.

[0038] Preferably, a sludge discharge pipeline 2 46 is also provided at the bottom of the sedimentation area 43, and the sludge discharge pipeline 2 46 is connected to one of the sludge circulation pipelines 1 47. The sludge discharge pipeline 2 46 is connected to a backwash pipeline 52. The setting of the backwash pipeline 52 can flush the sedimentation area 43 to avoid clogging of the sedimentation area 43 by sludge, thereby better ensuring the working efficiency of the density clarification device 3.

[0039] Embodiment 5:

[0040] This embodiment describes the activated carbon filter 6, specifically:

[0041] The activated carbon filter 6 includes a filter 1 56 and a filter 2 57. The filter 1 56 and the filter 2 57 adopt the activated carbon filtration in the prior art. The top of the filter 1 56 is connected to the output end of the sand filter 5 through the filter feed pipeline 58. The top of the filter 2 57 is connected to the output end of the sand filter 5 through the filter feed pipeline 58. The oxidized waste alkali liquid processed by the sand filter 5 can enter the filter 1 56 and the filter 2 57 for filtration at the same time, or enter the filter 2 57 for filtration after the filtration of the filter 1 56 is completed; the bottom of the filter 1 56 is connected to the filter 2 57 through the filter discharge pipeline 1 59. The top is connected, the bottom of the filter 1 56 is connected to the wastewater extraction pipeline 60, the filter 1 discharge pipeline 1 59 is connected to the filter 1 discharge pipeline 2 61, the filter 1 discharge pipeline 2 61 is connected to the self-cleaning filter, and the output end of the self-cleaning filter is connected to the ultrafiltration device 7; preferably, the self-cleaning filter includes a self-cleaning filter 1 62 and a self-cleaning filter 2 63 arranged in parallel, the bottom of the filter 2 57 is connected to the self-cleaning filter through the filter 2 discharge pipeline 1 64 and the filter 1 discharge pipeline 2 61, and the bottom of the filter 2 57 is connected to the wastewater extraction pipeline 60 through the filter 2 discharge pipeline 2 65.

[0042] The self-cleaning filter 1 62 and the self-cleaning filter 2 63 are arranged in parallel so that one of them can be used selectively. When one of them has a problem, the other can continue to be used to ensure the normal operation. The self-cleaning filter 1 62 and the self-cleaning filter 2 63 use the filter mesh to directly intercept impurities in the water, remove suspended matter and particulate matter in the water, reduce turbidity, purify water quality, and reduce the generation of system dirt, bacteria, algae, rust, etc. to purify water quality; the bottoms of the filter 1 56 and the filter 2 57 are connected to the backwash water inlet pipeline 66, and the upper parts of the filter 1 56 and the filter 2 57 are connected to the backwash water outlet pipeline 67; the backwash water inlet pipeline 66 can backwash the activated carbon of the filter 1 56 and the filter 2 57, thereby improving the filtration efficiency of the filter 1 56 and the filter 2 57 and the service life of the activated carbon. The flushing water is led out through the backwash water outlet pipeline 67 for subsequent treatment.

[0043] The activated carbon filter 6 of this embodiment is provided with two stages, which can better filter the waste liquid and can achieve regular flushing, thereby improving the filtering effect of the activated carbon filter 6, reducing the number of times the activated carbon needs to be replaced, and thus reducing the overall operating cost.

[0044] The working principle of the present invention is as follows: the oxidized waste alkali liquor is first transported to the decarbonization device 1. After the decarbonization treatment, the carbon dioxide content in the waste alkali liquor is significantly reduced, and the oxidized waste alkali liquor after preliminary decarbonization is obtained, which is then transported to the heat exchange device 2. After the heat exchange device 2 cools down the waste alkali liquor so that its temperature reaches a state that meets the requirements of the next treatment process, and then is transported to the density clarification device 3; when the waste alkali liquor is in a static or slowly flowing state, the sludge material with a larger density will gradually sink, and the material with a smaller density will gradually float up, and the liquid phase material is extracted through the intermediate water tank feed pipeline 44 to the intermediate water tank 9, and the sludge at the bottom is extracted and sent to the solid waste treatment facility for separate treatment; after the preliminary purification of the oxidized waste alkali liquor, it is adjusted by the intermediate buffer device 4, and the flow rate and pressure of the waste alkali liquor are adjusted. The forces all reach a state that meets the requirements of the next process, and then are transported to the sand filter 5. After being filtered by the sand filter 5, impurities such as suspended matter and sediment in the waste alkali liquid are greatly reduced, and a purer oxidized waste alkali liquid is obtained. It is then transported to the activated carbon filter 6. After being adsorbed by the activated carbon filter 6, the contents of organic matter, odorous substances, and some heavy metal ions in the waste alkali liquid are significantly reduced, and further purified oxidized waste alkali liquid is obtained. It is then transported to the ultrafiltration device 7. After being filtered by the ultrafiltration device 7, highly purified oxidized waste alkali liquid is obtained, and its purity and quality are significantly improved, which can meet the relevant requirements of subsequent treatment or discharge; through the treatment processes of the above-mentioned devices, the oxidized waste alkali liquid is gradually purified, treated and optimized to meet different subsequent needs.

[0045] To sum up, due to the adoption of the above-mentioned technical solution, the present application simplifies the overall structure, and by setting an intermediate buffer device, it can stabilize the process and the flow difference between the upstream and downstream processes, ensuring that the operation of the entire treatment device is more stable; in addition, during the treatment process, if a certain link fails or requires temporary shutdown for maintenance, the intermediate buffer device can store a certain amount of waste alkali liquid, which buys time for troubleshooting, avoids the accumulation or leakage of waste alkali liquid, and reduces production risks; more preferably, the activated carbon filter of the present application is set at two levels to better filter the waste liquid, and can achieve regular flushing, thereby improving the filtering effect of the activated carbon filter, reducing the number of times the activated carbon is replaced, and thus reducing the overall operating cost.

[0046] The devices and connection relationships not specifically described above all belong to mechanical connections, electrical connections, etc. in the prior art, and the present invention will not describe them in detail here.

[0047] The preferred embodiment of the present invention is described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of the present invention will not be described separately.

[0049] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, their applications should also be regarded as the contents disclosed in the present invention.

Claims

1. A device for treating waste alkali liquor from oxidation, comprising a decarbonization device (1), characterized in that: The decarbonization device (1) is connected to a heat exchange device (2), a density clarification device (3), an intermediate buffer device (4), a sand filter (5), an activated carbon filter (6), and an ultrafiltration device (7); the ultrafiltration device (7) is connected to a waste gas treatment duct (8); wherein the intermediate buffer device (4) comprises an intermediate water tank (9); the bottom of the intermediate water tank (9) is connected to a water production lift pump (12) and a water production lift pump (13) via a water tank delivery pipeline (10) and a water tank delivery pipeline (11), respectively; the water production lift pump (12) and the water production lift pump (13) are connected to the sand filter (5) via a production pipeline (14); and an intermediate water tank waste gas production pipeline (15) is provided at the top of the intermediate water tank (9).

2. The device for treating waste oxidative alkali liquor according to claim 1, wherein: The decarbonization device (1) includes a decarbonization water production tank (16), the decarbonization water production tank (16) is connected to a feed pipeline (17), an air inlet is provided on the decarbonization water production tank (16), a waste gas extraction pipeline (18) is provided on the top of the decarbonization water production tank (16), and a plurality of outlets are provided on one side of the decarbonization water production tank (16), wherein an outlet at the lower end is connected to a decarbonization water production lifting pump 1 (21) and a decarbonization water production lifting pump 2 (22) respectively through a decarbonization water production tank extraction pipeline 1 (19) and a decarbonization water production tank extraction pipeline 2 (20), and the decarbonization water production lifting pump 1 (21) and the decarbonization water production lifting pump 2 (22) are connected to the heat exchange device (2) through a decarbonization water production lifting pump extraction pipeline (23).

3. The device for treating waste oxidative alkali liquor according to claim 2, wherein: The top of the decarbonization water production tank (16) is connected to the decarbonization water production tank production pipeline one (19) through the decarbonization water production tank material pipeline one (24), and the top of the decarbonization water production tank (16) is connected to the decarbonization water production tank production pipeline two (20) through the decarbonization water production tank material pipeline two (25).

4. The device for treating waste oxidative alkali liquor according to claim 2, wherein: The heat exchange device (2) includes a pretreatment primary heat exchanger (26), a pretreatment secondary heat exchanger (27), and a pretreatment tertiary heat exchanger (28) connected in sequence. The pretreatment primary heat exchanger (26) is connected to the decarbonized water production lift pump extraction pipeline (23). The output end of the pretreatment tertiary heat exchanger (28) is connected to the pretreatment heat exchanger output pipeline (35), and the pretreatment heat exchanger output pipeline (35) is connected to the density clarification device (3); the pretreatment secondary heat exchanger (27) is respectively connected to the circulating water supply main (29) and the circulating water return main (30); and the pretreatment tertiary heat exchanger (28) is respectively connected to the external cooling heat exchanger (31) and the secondary refrigerant storage tank (32).

5. The device for treating waste oxidative alkali liquor according to claim 4, characterized in that: The density clarification device (3) includes a high-density clarifier (36), a mixing zone (37) of the high-density clarifier (36) is connected to the pretreatment heat exchanger output pipeline (35), and the mixing zone (37) is also connected to a flocculant dosing device (39) via a flocculant feed pipeline (38); a flocculation zone (40) of the high-density clarifier (36) is connected to a dosing device (42) via a drug feed pipeline (41); one side of the sedimentation zone (43) of the high-density clarifier (36) is connected to an intermediate water tank feed pipeline (44), the intermediate water tank feed pipeline (44) is connected to the intermediate water tank (9), and the bottom of the sedimentation zone (43) is connected to a sludge discharge pipeline (45). ), the sludge discharge pipeline one (45) is respectively connected to the sludge circulation pipeline one (47) and the sludge pump (50), the sludge circulation pipeline one (47) is respectively connected to the sludge circulation main pipeline (48) and the sludge extraction main pipeline (51), the output end of at least one sludge pump (50) is connected to the sludge circulation main pipeline one (49), and the sludge circulation main pipeline one (49) is connected to the sedimentation zone (43); the upper part of the mixing zone (37) and the sedimentation zone (43) is respectively connected to the waste gas extraction branch pipeline one (53) and the waste gas extraction branch pipeline two (54), and the waste gas extraction branch pipeline one (53) and the waste gas extraction branch pipeline two (54) are respectively connected to the waste gas extraction main pipeline (55).

6. The device for treating waste oxidizing alkali liquor according to claim 5, characterized in that: A second sludge discharge pipeline (46) is also provided at the bottom of the sedimentation zone (43), and the second sludge discharge pipeline (46) is connected to one of the first sludge circulation pipelines (47). The second sludge discharge pipeline (46) is connected to a backwashing pipeline (52).

7. The device for treating waste oxidizing alkali liquor according to claim 1, characterized in that: The activated carbon filter (6) comprises a filter 1 (56) and a filter 2 (57). The top of the filter 1 (56) is connected to the output end of the sand filter (5) through a filter feed line (58). The bottom of the filter 1 (56) is connected to the top of the filter 2 (57) through a filter 1 discharge line 1 (59). The bottom of the filter 1 (56) is connected to a wastewater extraction line (60). The filter 1 discharge line 1 (59) is connected to a filter 1 discharge line 2 (61). The filter 1 discharge line 2 (61) is connected to a self-cleaning filter. The output end of the self-cleaning filter is connected to an ultrafiltration device (7). The bottom of the filter 2 (57) is connected to the self-cleaning filter through a filter 2 discharge line 1 (64) and a filter 1 discharge line 2 (61). The bottom of the filter 2 (57) is connected to the wastewater extraction line (60) through a filter 2 discharge line 2 (65).

8. The device for treating waste oxidizing alkali liquor according to claim 7, characterized in that: The bottoms of the filter 1 (56) and the filter 2 (57) are both connected to a backwash water inlet pipeline (66), and the tops of the filter 1 (56) and the filter 2 (57) are both connected to a backwash water outlet pipeline (67).

9. The device for treating waste oxidizing alkali liquor according to claim 7, characterized in that: The top of the second filter (57) is connected to the output end of the sand filter (5) through a filter feed pipeline (58).

10. The device for treating waste oxidative alkali liquor according to claim 7, characterized in that: The self-cleaning filter comprises a self-cleaning filter 1 (62) and a self-cleaning filter 2 (63) which are arranged in parallel.

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