A desulfurization wastewater treatment system and method

Abstract

The present application relates to the technical field of desulfurization wastewater treatment, in particular to a desulfurization wastewater treatment system and method, which comprises an impurity removal mechanism for pre-removing impurities in desulfurization wastewater after chemical treatment; a sedimentation and separation mechanism connected to the lower end of the impurity removal mechanism for separating and treating the sediment in desulfurization wastewater after treatment by the impurity removal mechanism; and a membrane treatment mechanism connected to the lower end of the sedimentation and separation mechanism for membrane filtration treatment of desulfurization wastewater after treatment by the sedimentation and separation mechanism to obtain treated water. The desulfurization wastewater treatment system can realize efficient treatment of desulfurization wastewater in actual application.

Description

Technical Field

[0001] This invention relates to the field of desulfurization wastewater treatment technology, specifically to a desulfurization wastewater treatment system and method. Background Technology

[0002] Coal-fired power plants produce a large amount of sulfur dioxide during the coal combustion process. Desulfurization wastewater is mainly the wastewater used to absorb and remove sulfur dioxide when coal-fired power plants use wet desulfurization technology. Desulfurization wastewater contains a large amount of suspended solids, heavy metal ions, sulfates and other pollutants.

[0003] Currently, the most common treatment method for desulfurization wastewater is chemical precipitation. This method usually requires the installation of a sedimentation tank. However, the effluent cannot completely remove suspended solids (SS) and heavy metals. Therefore, after sedimentation, further treatment such as quartz sand filtration and ultrafiltration is required to further treat the effluent before reuse. This results in the need for a large amount of equipment to treat desulfurization wastewater, leading to a large system footprint, high investment and operating costs, and low desulfurization wastewater treatment efficiency.

[0004] Therefore, there is an urgent need for a desulfurization wastewater treatment system to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the problems of existing technologies that typically employ chemical precipitation for the treatment of desulfurization wastewater, which result in large system footprints, high investment and operating costs, and low wastewater treatment efficiency. This invention provides a desulfurization wastewater treatment system and method.

[0006] To achieve the above objectives, a first aspect of the present invention provides a desulfurization wastewater treatment system, the desulfurization wastewater treatment system comprising:

[0007] Impurity removal mechanism is used to pre-remove impurities from desulfurization wastewater after chemical treatment;

[0008] A sedimentation separation mechanism is connected to the lower end of the impurity removal mechanism and is used to separate the sediments in the desulfurization wastewater after it has been treated by the impurity removal mechanism.

[0009] A membrane treatment unit, connected to the lower end of the sedimentation and separation unit, is used to perform membrane filtration treatment on the desulfurization wastewater after it has been treated by the sedimentation and separation unit, so as to obtain treated water.

[0010] Preferably, the impurity removal mechanism includes a wastewater diversion pipe, at least one inclined outer frame, and a pre-impurity removal component. The pre-impurity removal component includes a horizontal frame pipe and a side frame for connecting at least one side of the horizontal frame pipe. The horizontal frame pipe is detachably disposed on the top of the inclined outer frame. The top of the horizontal frame pipe is open, and the bottom is provided with an inclined bottom plate. Several filter holes are provided on both sides for filtering the desulfurization wastewater and guiding it to the sedimentation separation mechanism at the bottom of the inclined outer frame. The wastewater diversion pipe is used to transport the chemically treated desulfurization wastewater into the horizontal frame pipe.

[0011] Preferably, the impurity removal mechanism further includes at least one inclined plate filter assembly disposed below the pre-impurity removal assembly. The inclined plate filter assembly includes a side sealing plate disposed inside the inclined outer frame and a plurality of parallel inclined filter plates disposed between the two side sealing plates, for filtering the desulfurization wastewater filtered through the filter holes and then guiding it to the sedimentation separation mechanism at the bottom of the inclined outer frame.

[0012] Preferably, the inclined bottom plate and the inclined filter plate are set at an inclination angle of 5°-60° relative to the horizontal plane.

[0013] Preferably, the oblique outer frame is provided in two symmetrically connected to both ends of the wastewater diversion pipe; the wastewater diversion pipe includes a main pipe, a transverse pipe connected to the main pipe, and at least one diversion tube connected to one side of the transverse pipe, wherein at least one diversion tube is connected to the transverse frame pipe in a one-to-one correspondence.

[0014] Preferably, the sedimentation separation mechanism includes a sealing transition frame connected to the bottom of the inclined outer frame, a conical cover disposed inside the sealing transition frame and convex upward, and a self-cleaning component for scraping the sediment on the surface of the conical cover to the impurity removal sealing plate on the side of the sealing transition frame. The surface of the conical cover is provided with several filter ports for allowing the filtered desulfurization wastewater to enter the membrane treatment mechanism at the bottom of the sealing transition frame.

[0015] Preferably, the self-cleaning assembly includes a rotating plate and a drive motor for driving the rotating plate to rotate and scrape off the deposits on the surface of the conical cover, wherein the scraping surface of the rotating plate is configured to conform to the surface of the conical cover.

[0016] Preferably, the membrane treatment mechanism includes a conical tube that is connected to the bottom of the sealing transition frame and is recessed downwards. A nanofiltration membrane tube is detachably disposed at the bottom of the conical tube, and a nanofiltration membrane or a reverse osmosis membrane is disposed inside the nanofiltration membrane tube.

[0017] Preferably, it further includes a support frame for fixing and supporting the impurity removal mechanism, the precipitation separation mechanism and the membrane treatment mechanism.

[0018] A second aspect of the present invention provides a method for treating desulfurization wastewater, applied to the aforementioned desulfurization wastewater treatment system, the method comprising the following steps:

[0019] S1. Desulfurization wastewater collection: Collect desulfurization wastewater generated by coal-fired power plants;

[0020] S2. Chemical treatment: The collected desulfurization wastewater is chemically treated to remove acidic substances, alkaline substances and heavy metal ions from the wastewater.

[0021] S3. Impurity pre-removal: The desulfurization wastewater after chemical treatment is transported to the impurity removal mechanism for impurity pre-removal treatment;

[0022] S4. Sedimentation and separation: The desulfurization wastewater after being treated by the impurity removal mechanism is transported to the sedimentation and separation mechanism for sediment separation treatment;

[0023] S5. Membrane treatment: The desulfurization wastewater treated by the sedimentation and separation mechanism is transported to the membrane treatment mechanism for membrane filtration to obtain treated water.

[0024] According to the above technical solution, the desulfurization wastewater treatment system sequentially treats the desulfurization wastewater by setting up an impurity removal mechanism, a sedimentation separation mechanism, and a membrane treatment mechanism. In practical applications, this can effectively improve the treatment efficiency and effect of desulfurization wastewater. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the desulfurization wastewater treatment system;

[0026] Figure 2 This is a schematic diagram of the overall structure of the desulfurization wastewater treatment system from another perspective;

[0027] Figure 3 This is a schematic diagram of the pre-removal component of the impurity removal mechanism in a desulfurization wastewater treatment system.

[0028] Figure 4 This is a schematic diagram of the inclined plate filter assembly of the impurity removal mechanism in a desulfurization wastewater treatment system.

[0029] Figure 5 This is a schematic diagram of the sedimentation and separation mechanism and the membrane treatment mechanism of the desulfurization wastewater treatment system;

[0030] Figure 6 This is a partial structural diagram of the sedimentation and separation mechanism and the membrane treatment mechanism of the desulfurization wastewater treatment system.

[0031] Figure 7 This is a flowchart of the desulfurization wastewater treatment method.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Impurity removal mechanism; 11. Wastewater diversion pipe; 111. Main pipe; 112. Horizontal pipe; 113. Diversion fine pipe; 12. Sloping outer frame; 13. Pre-impurity removal assembly; 131. Horizontal frame pipe; 1311. Filter hole; 1312. Sloping bottom plate; 132. Side frame; 14. Sloping plate filter assembly; 141. Side sealing plate; 142. Sloping filter plate; 2. Sedimentation separation mechanism; 21. Sealed transition frame; 22. Impurity removal port sealing plate; 23. Conical cover; 231. Filter port; 24. Self-cleaning assembly; 241. Drive motor; 242. Rotating plate; 3. Membrane treatment mechanism; 31. Conical tube; 32. Nanofiltration membrane tube; 4. Fixing frame. Detailed Implementation

[0034] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0035] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of indicated technical features. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean a non-exclusive inclusion, the possibility of the presence or addition of one or more other features, units, components, and / or combinations thereof.

[0036] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] The first aspect of this invention provides a desulfurization wastewater treatment system, such as... Figure 1-6 As shown, the desulfurization wastewater treatment system includes:

[0038] Impurity removal unit 1 is used to pre-remove impurities from desulfurization wastewater after chemical treatment.

[0039] The sedimentation separation mechanism 2 is connected to the lower end of the impurity removal mechanism 1 and is used to separate the sediment in the desulfurization wastewater after it has been treated by the impurity removal mechanism 1.

[0040] The membrane treatment unit 3 is connected to the lower end of the sedimentation and separation unit 2 and is used to perform membrane filtration treatment on the desulfurization wastewater after it has been treated by the sedimentation and separation unit 2 to obtain treated water.

[0041] According to the above technical solution, the desulfurization wastewater treatment system sequentially treats the desulfurization wastewater by setting up an impurity removal mechanism, a sedimentation separation mechanism, and a membrane treatment mechanism. In practical applications, this can effectively improve the treatment efficiency and effect of desulfurization wastewater.

[0042] In the desulfurization wastewater treatment system described in this invention, preferably, as follows: Figure 2-3 As shown, the impurity removal mechanism 1 includes a wastewater diversion pipe 11, at least one inclined outer frame 12, and a pre-impurity removal component 13. The pre-impurity removal component 13 includes a horizontal frame pipe 131 and a side frame 132 for connecting one side of at least one of the horizontal frame pipes 131. Specifically, the side frame 132 is connected to the non-inlet side of several horizontal frame pipes 131 arranged side by side, allowing the several horizontal frame pipes 131 arranged side by side to circulate with each other through the non-inlet side. The horizontal frame pipe 131 is detachably installed on the top of the inclined outer frame 12. The top of the horizontal frame pipe 131 is open, and the bottom is provided with an inclined bottom plate 1312. Several filter holes 1311 are opened on both sides for filtering the desulfurization wastewater and guiding it to the sedimentation separation mechanism 2 at the bottom of the inclined outer frame 12. The wastewater diversion pipe 11 is used to transport the chemically treated desulfurization wastewater to the horizontal frame pipe 131.

[0043] Specifically, the oblique outer frame 12 is provided with two symmetrically connected to both ends of the wastewater diversion pipe 11; the wastewater diversion pipe 11 includes a main pipe 111, a transverse pipe 112 connected to the main pipe 111, and at least one diversion capillary 113 connected to one side of the transverse pipe 112, with at least one diversion capillary 113 corresponding to one of the transverse frame pipes 131. In a specific embodiment, such as Figure 3 As shown, four diversion tubes 113 are provided on one side of the horizontal tube 112. The four diversion tubes 113 are respectively connected to the water inlets on the left side of the four horizontal frame tubes 131, and the right side of the four horizontal frame tubes 131 is connected to the side frame 132.

[0044] In practical applications, the desulfurization wastewater, after being chemically treated to remove acidic substances, alkaline substances, and heavy metal ions, sequentially enters the horizontal frame pipe 131 through the main pipe 111, the horizontal pipe 112, and the diversion pipe 113. The wastewater entering the horizontal frame pipe 131 is then pre-filtered through several filter holes 1311 and guided to the sedimentation separation mechanism 2 at the bottom of the inclined outer frame 12. The horizontal frame pipe 131 is located at the top of the inclined outer frame 12 and has an opening at the top, which facilitates the cleaning of larger impurities filtered out during the initial filtration while effectively filtering the desulfurization wastewater. In a preferred embodiment, such as... Figure 3 As shown, the inclined bottom plate 1312 at the bottom of the horizontal frame tube 131 is sloped and the slope decreases gradually as it extends inward from the water inlet, thereby achieving better full-coverage filtration.

[0045] Further preferred, such as Figure 4 As shown, the impurity removal mechanism 1 further includes at least one inclined plate filter assembly 14 disposed below the pre-impurity removal assembly 13. The inclined plate filter assembly 14 includes a side sealing plate 141 disposed inside the inclined outer frame 12 and a plurality of parallel inclined filter plates 142 disposed between the two side sealing plates 141. It is used to filter the desulfurization wastewater filtered through the filter holes 1311 and then guide it to the sedimentation separation mechanism 2 at the bottom of the inclined outer frame 12. Therefore, in practical applications, the desulfurization wastewater can be further treated, thereby improving the treatment effect. In a preferred embodiment, the inclined filter plates 142 are arranged at an inclination angle of 5°-60° relative to the horizontal plane, preferably at an inclination angle of 5°-45°, and more preferably at an inclination angle of 5°-30°, thereby further improving the filtration effect on the desulfurization wastewater. The horizontal frame tube 131 is detachably installed on the top of the inclined outer frame 12, and the two inclined plate filter assemblies 14 are installed below the pre-removal assembly 13. This facilitates the regular cleaning of the inclined filter plates 142 of the inclined plate filter assembly 14, avoiding clogging that could affect the treatment effect on desulfurization wastewater.

[0046] In the desulfurization wastewater treatment system described in this invention, preferably, as follows: Figure 5-6 As shown, the sedimentation separation mechanism 2 includes a sealing transition frame 21 connected to the bottom of the inclined outer frame 12, a conical cover 23 disposed inside the sealing transition frame 21 and protruding upward, and a self-cleaning component 24 for scraping the sediment on the surface of the conical cover 23 to the impurity removal sealing plate 22 on the side of the sealing transition frame 21. The surface of the conical cover 23 is provided with a plurality of filter ports 231 for allowing the filtered desulfurization wastewater to enter the membrane treatment mechanism 3 at the bottom of the sealing transition frame 21.

[0047] In one specific embodiment, the self-cleaning component 24 includes a rotating plate 242 and a drive motor 241 for driving the rotating plate 242 to rotate and scrape off the deposits on the surface of the conical cover 23, wherein the scraping surface of the rotating plate 242 is arranged in contact with the surface of the conical cover 23.

[0048] In practical applications, the desulfurization wastewater filtered by the parallel inclined filter plates 142 enters the sealed transition frame 21. The wastewater then leaks down into the membrane treatment mechanism 3 through several filter ports 231, while sediment is scraped by the rotating plate 242 and discharged through the impurity outlet 22. This effectively improves the treatment efficiency of the desulfurization wastewater and prevents clogging of the filter ports 231 due to sediment buildup. The rotating plate 242 is fitted to the upward-convex conical cover 23, which effectively scrapes away sediment while correcting the shape of the cover to prevent deformation. The upward-convex design of the cover 23 increases the filtration area for wastewater and allows sediment to accumulate better at the impurity outlet 22, facilitating cleaning.

[0049] In the desulfurization wastewater treatment system described in this invention, preferably, as follows: Figure 6 As shown, the membrane treatment mechanism 3 includes a conical tube 31 that is connected to the bottom of the sealing transition frame 21 and is concave downwards. A nanofiltration membrane tube 32 is detachably disposed at the bottom of the conical tube 31. A nanofiltration membrane or a reverse osmosis membrane, preferably a nanofiltration membrane, is disposed inside the nanofiltration membrane tube 32. By further designing the conical tube 31 connected to the bottom of the sealing transition frame 21 as a concave cone and detachably disposing of the nanofiltration membrane tube 32 at its bottom, in practical applications, wastewater treated by the sedimentation separation mechanism 2 can quickly enter the nanofiltration membrane tube 32, thereby effectively improving the wastewater treatment efficiency and facilitating the replacement of the nanofiltration membrane or reverse osmosis membrane.

[0050] In the desulfurization wastewater treatment system of the present invention, preferably, it further includes a support frame 4 for fixing and supporting the impurity removal mechanism 1, the sedimentation separation mechanism 2, and the membrane treatment mechanism 3 to form an integrated structure, thereby reducing the plant area occupied. Specifically, the support frame 4 is located on the outside of the inclined outer frame 12 and the sealing transition frame 21. The support frame 4 provides close support for the inclined outer frame 12 and fixes the impurity removal mechanism 1 and the sedimentation separation mechanism 2, ensuring the sealing of the connection between the impurity removal mechanism 1 and the sedimentation separation mechanism 2.

[0051] A second aspect of the present invention provides a method for treating desulfurization wastewater, such as... Figure 7 As shown, the desulfurization wastewater treatment method includes the following steps:

[0052] S1. Desulfurization wastewater collection: Collect desulfurization wastewater generated by coal-fired power plants; specifically, desulfurization wastewater can also be desulfurization wastewater generated in any other area.

[0053] S2. Chemical treatment: The collected desulfurization wastewater is chemically treated to remove acidic substances, alkaline substances and heavy metal ions from the wastewater.

[0054] S3. Impurity pre-removal: The desulfurization wastewater after chemical treatment is transported to the impurity removal unit 1 for impurity pre-removal treatment; the suspended solids, silt and other impurities in the wastewater are removed by filtration.

[0055] S4. Sedimentation and separation: The desulfurization wastewater treated by the impurity removal mechanism 1 is transported to the sedimentation and separation mechanism 2 for sediment separation treatment; specifically, flocculant is added to the sealed transition frame 21 of the sedimentation and separation mechanism 2 to separate suspended solids, silt and other impurities in the wastewater;

[0056] S5. Membrane treatment: The desulfurization wastewater treated by the sedimentation and separation unit 2 is transported to the membrane treatment unit 3 for membrane filtration to obtain treated water.

[0057] According to the above technical solution, based on this desulfurization wastewater treatment method, by chemically treating the desulfurization wastewater before sequentially treating it with the impurity removal mechanism, the sedimentation separation mechanism, and the membrane treatment mechanism, the treatment effect and efficiency of the desulfurization wastewater can be effectively guaranteed.

[0058] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0059] Example 1

[0060] Adopting such Figure 1-6 The desulfurization wastewater treatment system shown herein specifically includes:

[0061] Impurity removal unit 1 is used to pre-remove impurities from desulfurization wastewater after chemical treatment.

[0062] The sedimentation separation mechanism 2 is connected to the lower end of the impurity removal mechanism 1 and is used to separate the sediment in the desulfurization wastewater after it has been treated by the impurity removal mechanism 1.

[0063] Membrane treatment unit 3 is connected to the lower end of the sedimentation separation unit 2 and is used to perform membrane filtration treatment on the desulfurization wastewater after it has been treated by the sedimentation separation unit 2 to obtain treated water.

[0064] It also includes a support frame 4 for fixing and supporting the impurity removal mechanism 1, the precipitation separation mechanism 2 and the membrane treatment mechanism 3;

[0065] The impurity removal mechanism 1 includes a wastewater diversion pipe 11, at least one inclined outer frame 12, and a pre-impurity removal component 13. The pre-impurity removal component 13 includes a horizontal frame pipe 131 and a side frame 132 for connecting at least one side of the horizontal frame pipe 131. The horizontal frame pipe 131 is detachably disposed on the top of the inclined outer frame 12. The top of the horizontal frame pipe 131 is open, and the bottom is provided with an inclined bottom plate 1312. Several filter holes 1311 are opened on both sides for filtering the desulfurization wastewater and guiding it to the sedimentation separation mechanism 2 at the bottom of the inclined outer frame 12. The wastewater diversion pipe 11 is used to transport the chemically treated desulfurization wastewater into the horizontal frame pipe 131.

[0066] Two oblique outer frames 12 are provided and symmetrically connected to both ends of the wastewater diversion pipe 11; the wastewater diversion pipe 11 includes a main pipe 111, a transverse pipe 112 connected to the main pipe 111, and four diversion caps 113 connected to one side of the transverse pipe 112, with the four diversion caps 113 corresponding to the transverse frame pipe 131.

[0067] The impurity removal mechanism 1 further includes two inclined plate filter assemblies 14 disposed below the pre-impurity removal assembly 13. The inclined plate filter assembly 14 includes a side sealing plate 141 disposed inside the inclined outer frame 12 and a plurality of parallel inclined filter plates 142 disposed between the two side sealing plates 141. It is used to filter the desulfurization wastewater filtered through the filter holes 1311 and then guide it to the sedimentation separation mechanism 2 at the bottom of the inclined outer frame 12. The inclined filter plates 142 are set at an inclination angle of 20° relative to the horizontal plane.

[0068] In practical applications, S1, desulfurization wastewater collection: collecting desulfurization wastewater generated by coal-fired power plants;

[0069] S2. Chemical treatment: The collected desulfurization wastewater is chemically treated to remove acidic substances, alkaline substances and heavy metal ions from the wastewater.

[0070] S3. Impurity pre-removal: The desulfurization wastewater after chemical treatment is transported to the impurity removal unit 1 for impurity pre-removal treatment;

[0071] S4. Sedimentation and separation: The flocculant and the desulfurization wastewater treated by the impurity removal mechanism 1 are transported to the sedimentation and separation mechanism 2 for sediment separation.

[0072] S5. Membrane treatment: The desulfurization wastewater treated by the sedimentation and separation unit 2 is transported to the membrane treatment unit 3 for membrane filtration to obtain treated water.

[0073] Testing has shown that the desulfurization wastewater treatment system described in this invention can effectively improve the treatment efficiency and effect of desulfurization wastewater compared with the existing desulfurization wastewater treatment scheme based on sedimentation tanks, and has the advantages of simple operation and small footprint.

[0074] Example 2

[0075] Referring to Embodiment 1, the difference is that the sedimentation separation mechanism 2 includes a sealing transition frame 21 connected to the bottom of the inclined outer frame 12, a conical cover 23 disposed inside the sealing transition frame 21 and protruding upward, and a self-cleaning component 24 for scraping the sediment on the surface of the conical cover 23 to the impurity removal sealing plate 22 on the side of the sealing transition frame 21. The surface of the conical cover 23 has a plurality of filter openings 231 for allowing the filtered desulfurization wastewater to enter the membrane treatment mechanism 3 at the bottom of the sealing transition frame 21. The self-cleaning component 24 includes a rotating plate 242 and a drive motor 241 for driving the rotating plate 242 to rotate and scrape the sediment on the surface of the conical cover 23. The scraping surface of the rotating plate 242 is arranged in contact with the surface of the conical cover 23.

[0076] Testing revealed that the desulfurization wastewater treatment system described in this invention, compared to the solution in Example 1, can further improve the treatment efficiency and effect of desulfurization wastewater.

[0077] Example 3

[0078] Referring to Embodiment 2, the difference is that the membrane treatment mechanism 3 includes a conical tube 31 that is connected to the bottom of the sealing transition frame 21 and is recessed downwards. A nanofiltration membrane tube 32 is detachably provided at the bottom of the conical tube 31, and a nanofiltration membrane is provided inside the nanofiltration membrane tube 32.

[0079] Testing revealed that the desulfurization wastewater treatment system described in this invention, compared to the solution in Example 2, can further improve the treatment efficiency and effect of desulfurization wastewater.

[0080] The desulfurization wastewater treatment system and method provided by the present invention treats desulfurization wastewater by setting up an impurity removal mechanism, a sedimentation separation mechanism and a membrane treatment mechanism in sequence. In practical applications, it can effectively improve the treatment efficiency and effect of desulfurization wastewater.

[0081] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A desulfurization wastewater treatment system, characterized in that, The desulfurization wastewater treatment system includes: Impurity removal mechanism (1) is used to pre-remove impurities from desulfurization wastewater after chemical treatment; A sedimentation separation mechanism (2) is connected to the lower end of the impurity removal mechanism (1) and is used to separate the sediment in the desulfurization wastewater after it has been treated by the impurity removal mechanism (1). A membrane treatment unit (3) is connected to the lower end of the sedimentation separation unit (2) and is used to perform membrane filtration treatment on the desulfurization wastewater after it has been treated by the sedimentation separation unit (2) to obtain treated water. The impurity removal mechanism (1) includes a wastewater diversion pipe (11), at least one inclined outer frame (12), and a pre-impurity removal component (13). The pre-impurity removal component (13) includes a horizontal frame pipe (131) and a side frame (132) for connecting at least one side of the horizontal frame pipe (131). The horizontal frame pipe (131) is detachably disposed on the top of the inclined outer frame (12). The top of the horizontal frame pipe (131) is open, and the bottom is provided with an inclined bottom plate (1312). Several filter holes (1311) are opened on both sides for filtering the desulfurization wastewater and guiding it to the sedimentation separation mechanism (2) at the bottom of the inclined outer frame (12). The wastewater diversion pipe (11) is used to transport the chemically treated desulfurization wastewater into the horizontal frame pipe (131). The impurity removal mechanism (1) further includes at least one inclined plate filter assembly (14) disposed below the pre-impurity removal assembly (13). The inclined plate filter assembly (14) includes a side sealing plate (141) disposed inside the inclined outer frame (12) and a plurality of parallel inclined filter plates (142) disposed between the two side sealing plates (141), which are used to filter the desulfurization wastewater filtered through the filter holes (1311) and then guide it to the sedimentation separation mechanism (2) at the bottom of the inclined outer frame (12). The sedimentation separation mechanism (2) includes a sealing transition frame (21) connected to the bottom of the inclined outer frame (12), a conical cover (23) disposed inside the sealing transition frame (21) and protruding upward, and a self-cleaning component (24) for scraping the sediment on the surface of the conical cover (23) to the impurity removal sealing plate (22) on the side of the sealing transition frame (21). The surface of the conical cover (23) is provided with several filter ports (231) for allowing the filtered desulfurization wastewater to enter the membrane treatment mechanism (3) at the bottom of the sealing transition frame (21). The self-cleaning assembly (24) includes a rotating plate (242) and a drive motor (241) for driving the rotating plate (242) to rotate and scrape off the deposits on the surface of the conical cover (23). The scraping surface of the rotating plate (242) is arranged in contact with the surface of the conical cover (23). The membrane treatment mechanism (3) includes a conical tube (31) that is connected to the bottom of the sealing transition frame (21) and is recessed downwards. A nanofiltration membrane tube (32) is detachably provided at the bottom of the conical tube (31), and a nanofiltration membrane or a reverse osmosis membrane is provided inside the nanofiltration membrane tube (32).

2. The desulfurization wastewater treatment system according to claim 1, characterized in that, The inclined filter plate (142) is set at an angle of 5°-60° relative to the horizontal plane.

3. The desulfurization wastewater treatment system according to claim 1, characterized in that, Two oblique outer frames (12) are provided and symmetrically connected to both ends of the wastewater diversion pipe (11); the wastewater diversion pipe (11) includes a main pipe (111), a transverse pipe (112) connected to the main pipe (111), and at least one diversion tube (113) connected to one side of the transverse pipe (112), and at least one diversion tube (113) is connected to the transverse frame pipe (131) in a one-to-one correspondence.

4. The desulfurization wastewater treatment system according to claim 1, characterized in that, It also includes a support frame (4) for fixing and supporting the impurity removal mechanism (1), the precipitation separation mechanism (2) and the membrane treatment mechanism (3).

5. A method for treating desulfurization wastewater, characterized in that, The desulfurization wastewater treatment method, applied to the desulfurization wastewater treatment system according to any one of claims 1-4, comprises the following steps: S1. Desulfurization wastewater collection: Collect desulfurization wastewater generated by coal-fired power plants; S2. Chemical treatment: The collected desulfurization wastewater is chemically treated to remove acidic substances, alkaline substances and heavy metal ions from the wastewater. S3, Impurity Pre-removal: The desulfurization wastewater after chemical treatment is transported to the impurity removal mechanism (1) for impurity pre-removal treatment; S4. Sedimentation and separation: The desulfurization wastewater after being treated by the impurity removal mechanism (1) is transported to the sedimentation and separation mechanism (2) for sediment separation treatment; S5. Membrane treatment: The desulfurized wastewater after being treated by the sedimentation separation unit (2) is transported to the membrane treatment unit (3) for membrane filtration treatment to obtain treated water.

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