Power plant sewage treatment device and treatment method

Abstract

The invention discloses a power plant sewage treatment device and method.The treatment device comprises a sewage pretreatment box, a sewage sedimentation box, a sewage purification box, a sewage aeration box and a clarification tank, a sewage inlet pipe is installed at the water inlet end of the sewage pretreatment box, and a multi-stage impurity filter screen assembly is installed in the sewage pretreatment box; the water outlet end of the sewage pretreatment box is connected with the water inlet end of the sewage settling box through a first pipeline, the water outlet end of the sewage settling box is connected with the water inlet end of the sewage purification box through a second pipeline, and the water outlet end of the sewage purification box is connected with the water inlet end of the sewage aeration box through a third pipeline; the multi-stage sewage treatment device is novel in structural design, can realize multi-stage purification treatment of power plant sewage, is low in treatment cost, and solves the problems that sewage treatment of sewage equipment in an existing thermal power plant is not perfect enough, the sewage treatment efficiency is high, the sewage treatment cost is low and the like. And the cost is high.

Description

Technical Field

[0001] This invention relates to the field of power plant wastewater treatment technology, specifically to a wastewater treatment device and treatment method for power plants. Background Technology

[0002] Power plant wastewater mainly includes boiler water discharge, circulating water discharge, desulfurization wastewater, denitrification wastewater, dust removal water, ash plant drainage, pulverized coal, ammonia nitrogen, and reverse osmosis concentrated water. Traditional water treatment methods mainly involve acid-base neutralization, chemical precipitation, biochemical treatment, filtration, and reverse osmosis before discharge. The discharged wastewater contains a large amount of soluble salts and has high salinity. Power plant enterprises must ensure that the circulating water does not scale or corrode and achieve zero discharge.

[0003] Existing water treatment methods require a large area, consume excessive water resources, and still contain a significant amount of impurities and ions in the treated water, resulting in poor environmental performance. Therefore, it is necessary to improve them. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater treatment device and method for power plants to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wastewater treatment device for power plants, the device comprising a wastewater pretreatment tank, a wastewater sedimentation tank, a wastewater purification tank, a wastewater aeration tank, and a clarification tank. A wastewater inlet pipe is installed at the inlet end of the wastewater pretreatment tank. A multi-stage impurity filter assembly is installed inside the wastewater pretreatment tank. The outlet end of the wastewater pretreatment tank is connected to the inlet end of the wastewater sedimentation tank via a first pipe. The outlet end of the wastewater sedimentation tank is connected to the inlet end of the wastewater purification tank via a second pipe. The outlet end of the wastewater purification tank is connected to the inlet end of the wastewater aeration tank via a third pipe. The outlet end of the wastewater aeration tank is connected to the inlet end of the clarification tank via a fourth pipe. A discharge pipe is installed at the outlet end of the clarification tank.

[0006] Preferably, this application provides a wastewater treatment device for power plants, wherein the upper end face of the wastewater pretreatment tank is equipped with a plug-in groove, the multi-stage impurity filter assembly includes a mesh frame, a first coarse wire mesh, a first filter plate, a second coarse wire mesh, a second filter plate, and a fine wire mesh, the first coarse wire mesh, the first filter plate, the second coarse wire mesh, the second filter plate, and the fine wire mesh are sequentially installed in the mesh frame, and an impurity collection tank is installed below the wastewater pretreatment tank.

[0007] Preferably, this application provides a wastewater treatment device for power plants, wherein a precipitant feeding hopper is installed on the upper surface of the wastewater sedimentation tank, a stirring assembly is installed inside the wastewater sedimentation tank, a sedimentation chamber is provided on the lower surface of the wastewater sedimentation tank, the stirring assembly includes a stirring shaft, a stirring motor, and a stirring rod, the stirring shaft is installed longitudinally inside the wastewater sedimentation tank, the stirring motor is installed on the upper surface of the wastewater sedimentation tank, the stirring rod is perpendicular to the outer wall of the stirring shaft, and the motor shaft of the stirring motor is connected to the end of the stirring shaft for transmission.

[0008] Preferably, the wastewater treatment device for power plants provided in this application includes, by weight, 20-40 parts of nano-calcium oxide, 5-10 parts of modified potassium hydroxide, 10-20 parts of calcium carbonate, 6-12 parts of diatomaceous earth, 8-20 parts of activated carbon granules, 10-20 parts of nano-zinc oxide, 12-24 parts of nano-alumina, and 4-10 parts of nano-silver particle powder.

[0009] Preferably, this application provides a wastewater treatment device for power plants, wherein a wastewater purification filter element is installed inside the wastewater purification tank. The wastewater purification filter element includes a filter frame, a first activated carbon filter, a non-woven fabric, a graphene filter, a second activated carbon filter, and a diatomite filter, wherein the first activated carbon filter, the non-woven fabric, the graphene filter, the second activated carbon filter, and the diatomite filter are sequentially fixed inside the filter frame.

[0010] Preferably, this application provides a wastewater treatment device for power plants, wherein an aeration assembly is installed inside the wastewater aeration box. The aeration assembly includes an aeration pipe, one end of which has an air inlet and the other end has an air outlet. A first cylindrical cavity and a second cylindrical cavity are respectively provided in the inner cavity of the aeration pipe. The first cylindrical cavity is vertically arranged and located on one side of the air inlet, and the second cylindrical cavity is horizontally arranged between the first cylindrical cavity and the air outlet. The inner wall of the first cylindrical cavity is also coated with a porous material.

[0011] Preferably, the present application provides a wastewater treatment device for power plants, wherein a filter plate is installed inside the clarification tank, a water quality analyzer is installed on one side of the clarification tank, and the water quality analyzer is connected to an external monitoring and control terminal.

[0012] Preferably, the wastewater treatment device for power plants provided in this application further includes a return flow component, which includes a return water pipe and a return water pump. The return water pipe is installed between the clarification tank and the wastewater purification tank, and the return water pump is installed on the return water pipe and connected to an external monitoring and control terminal.

[0013] Preferably, the wastewater treatment device for power plants provided in this application includes the following steps in its treatment method:

[0014] A. Wastewater from the power plant enters the wastewater pretreatment tank through the wastewater inlet pipe. The multi-stage impurity filter assembly in the wastewater pretreatment tank performs preliminary filtration of large particulate impurities in the wastewater.

[0015] B. After impurities are filtered, the wastewater is discharged into the wastewater sedimentation tank. The precipitant is added to the precipitant in the precipitant tank and mixed with the wastewater to react and settle. The precipitate falls into the sedimentation chamber below.

[0016] C. The settled wastewater is discharged into the wastewater purification tank, where it undergoes efficient adsorption and filtration through the wastewater purification filter element;

[0017] D. The purified wastewater is discharged into the wastewater aeration tank, where the aeration components complete the oxygenation process and enhance the contact between organic matter and microorganisms in the wastewater and dissolved oxygen, thereby oxidizing and decomposing the organic matter in the wastewater.

[0018] E. After aeration, the water is discharged into the clarification tank. Fine particles in the sewage settle due to gravity. The water quality tester detects the water quality and provides feedback on the test parameters.

[0019] F. If the water quality is found to be unacceptable, the return water pump will be turned on, and the water will be returned from the clarifier to the wastewater purification tank for further purification and filtration until the discharged water quality is normal.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The present invention has a novel structural design and can realize multi-stage purification treatment of power plant sewage. The treatment cost is low, which solves the problem that the sewage treatment equipment in the existing thermal power plant is not perfect and the cost is high. In addition, the treatment device has good environmental performance, can be recycled and has a long service life.

[0022] (2) In this invention, the multi-stage filter assembly installed in the sewage pretreatment tank can filter impurity particles in sewage in multiple stages, thereby improving the subsequent treatment effect.

[0023] (3) In this invention, the stirring component installed in the sewage sedimentation tank can ensure that the sewage and the precipitant are in full contact and react, thereby improving the sedimentation efficiency of harmful substances in the sewage.

[0024] (4) In this invention, the sewage purification filter element installed in the sewage purification tank has the functions of purification, adsorption and deodorization, which further improves the sewage treatment effect.

[0025] (5) In this invention, the aeration components installed in the sewage aeration box can achieve the purpose of oxygenation and enhance the contact between organic matter and microorganisms in sewage and dissolved oxygen, thereby ensuring that the microorganisms in the tank can oxidize and decompose organic matter in sewage under the condition of sufficient dissolved oxygen. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the multi-stage filter assembly structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the wastewater purification filter element structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the aeration component structure of the present invention;

[0030] Figure 5 This is a flowchart of the process of the present invention;

[0031] In the diagram: 1. Wastewater pretreatment tank; 2. Wastewater sedimentation tank; 3. Wastewater purification tank; 4. Wastewater aeration tank; 5. Clarification tank; 6. Wastewater inlet pipe; 7. Multi-stage impurity filter assembly; 8. First pipe; 9. Second pipe; 10. Third pipe; 11. Fourth pipe; 12. Discharge pipe; 13. Insertion groove; 14. Wire mesh frame; 15. First coarse wire mesh; 16. First filter plate; 17. Second coarse wire mesh; 18. Second filter plate; 19. Fine wire mesh; 20. Impurity collection tank; 21. Sedimentation agent feeding hopper; 22. Sedimentation chamber; 3. Stirring tank. 23. Stirring shaft, 24. Stirring motor, 25. Stirring rod, 26. Wastewater purification filter element, 27. Filter frame, 28. First activated carbon filter screen, 29. Non-woven fabric, 30. Graphene filter screen, 31. Second activated carbon filter screen, 32. Diatomite filter screen, 33. Aeration component, 34. Aeration pipe, 35. Air inlet, 36. Air outlet, 37. First cylindrical cavity, 38. Second cylindrical cavity, 39. Porous material, 40. Filter plate, 41. Water quality tester, 42. External monitoring and control terminal, 43. Return water pipe, 44. Return water pump. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-5This invention provides a technical solution: a wastewater treatment device for power plants, comprising a wastewater pretreatment tank 1, a wastewater sedimentation tank 2, a wastewater purification tank 3, a wastewater aeration tank 4, and a clarifier 5. A wastewater inlet pipe 6 is installed at the inlet end of the wastewater pretreatment tank 1. A multi-stage impurity filter assembly 7 is installed inside the wastewater pretreatment tank 1. The outlet end of the wastewater pretreatment tank 1 is connected to the inlet end of the wastewater sedimentation tank 2 via a first pipe 8. The outlet end of the wastewater sedimentation tank 2 is connected to the inlet end of the wastewater purification tank 3 via a second pipe 9. The outlet end of the wastewater purification tank 3 is connected to the inlet end of the wastewater aeration tank 4 via a third pipe 10. The outlet end of the wastewater aeration tank 4 is connected to the inlet end of the clarifier 5 via a fourth pipe 11. A discharge pipe 12 is installed at the outlet end of the clarifier 5.

[0034] In this invention, a slot 13 is installed on the upper surface of the wastewater pretreatment tank 1. The multi-stage impurity filter assembly 7 includes a frame 14, a first coarse wire mesh 15, a first filter plate 16, a second coarse wire mesh 17, a second filter plate 18, and a fine wire mesh 19. The first coarse wire mesh 15, the first filter plate 16, the second coarse wire mesh 17, the second filter plate 18, and the fine wire mesh 19 are sequentially installed within the frame 14. An impurity collection trough 20 is installed below the wastewater pretreatment tank 1. In this invention, the multi-stage filter assembly installed in the wastewater pretreatment tank can perform multi-stage filtration of impurity particles in the wastewater, improving the subsequent treatment effect.

[0035] In this invention, a precipitant feeding hopper 21 is installed on the upper surface of the sewage sedimentation tank 2. A stirring assembly is installed inside the sewage sedimentation tank 2, and a sedimentation chamber 22 is provided on the lower surface of the sewage sedimentation tank 2. The stirring assembly includes a stirring shaft 23, a stirring motor 24, and a stirring rod 25. The stirring shaft 23 is longitudinally installed inside the sewage sedimentation tank 2, the stirring motor 24 is installed on the upper surface of the sewage sedimentation tank 2, and the stirring rod 25 is perpendicular to the outer wall of the stirring shaft 23. The motor shaft of the stirring motor 24 is connected to the end of the stirring shaft 23 via a transmission connection. The precipitant components added to the precipitant feeding hopper include, by weight, 20-40 parts of nano-calcium oxide, 5-10 parts of modified potassium hydroxide, 10-20 parts of calcium carbonate, 6-12 parts of diatomaceous earth, 8-20 parts of activated carbon particles, 10-20 parts of nano-zinc oxide, 12-24 parts of nano-alumina, and 4-10 parts of nano-silver particle powder. In this invention, the stirring assembly installed inside the sewage sedimentation tank ensures sufficient contact and reaction between the sewage and the precipitant, improving the sedimentation efficiency of harmful substances in the sewage.

[0036] In this invention, a wastewater purification filter element 26 is installed inside the wastewater purification tank 3. The wastewater purification filter element 26 includes a filter frame 27, a first activated carbon filter 28, a non-woven fabric 29, a graphene filter 30, a second activated carbon filter 31, and a diatomite filter 32. The first activated carbon filter 28, non-woven fabric 29, graphene filter 30, second activated carbon filter 31, and diatomite filter 32 are sequentially fixed within the filter frame 27. In this invention, the wastewater purification filter element installed inside the wastewater purification tank has the functions of purification, adsorption, and deodorization, further improving the wastewater treatment effect.

[0037] In this invention, an aeration assembly 33 is installed inside the wastewater aeration tank 4. The aeration assembly 33 includes an aeration pipe 34, with an air inlet 35 at one end and an air outlet 36 at the other end. A first cylindrical cavity 37 and a second cylindrical cavity 38 are respectively provided within the inner cavity of the aeration pipe 34. The first cylindrical cavity 37 is vertically arranged and located on one side of the air inlet 35, while the second cylindrical cavity 38 is horizontally arranged between the first cylindrical cavity 37 and the air outlet 36. The inner wall of the first cylindrical cavity 37 is also coated with a porous material 39. In this invention, the aeration assembly installed inside the wastewater aeration tank can achieve the purpose of oxygenation and enhance the contact between organic matter and microorganisms in the wastewater and dissolved oxygen, thereby ensuring that the microorganisms in the tank can oxidize and decompose the organic matter in the wastewater under conditions of sufficient dissolved oxygen.

[0038] Furthermore, in this invention, a filter plate 40 is installed inside the clarifier 5, and a water quality analyzer 41 is installed on one side of the clarifier 5. The water quality analyzer 41 is connected to an external monitoring and control terminal 42. It also includes a reflux assembly, which includes a return water pipe 43 and a return water pump 44. The return water pipe 43 is installed between the clarifier 5 and the wastewater purification tank 3, and the return water pump 44 is installed on the return water pipe 43 and connected to the external monitoring and control terminal 42.

[0039] Working principle: The processing method of the present invention includes the following steps:

[0040] A. Wastewater from the power plant enters the wastewater pretreatment tank through the wastewater inlet pipe. The multi-stage impurity filter assembly in the wastewater pretreatment tank performs preliminary filtration of large particulate impurities in the wastewater.

[0041] B. After impurities are filtered, the wastewater is discharged into the wastewater sedimentation tank. The precipitant is added to the precipitant in the precipitant tank and mixed with the wastewater to react and settle. The precipitate falls into the sedimentation chamber below.

[0042] C. The settled wastewater is discharged into the wastewater purification tank, where it undergoes efficient adsorption and filtration through the wastewater purification filter element;

[0043] D. The purified wastewater is discharged into the wastewater aeration tank, where the aeration components complete the oxygenation process and enhance the contact between organic matter and microorganisms in the wastewater and dissolved oxygen, thereby oxidizing and decomposing the organic matter in the wastewater.

[0044] E. After aeration, the water is discharged into the clarification tank. Fine particles in the sewage settle due to gravity. The water quality tester detects the water quality and provides feedback on the test parameters.

[0045] F. If the water quality is found to be unacceptable, the return water pump will be turned on, and the water will be returned from the clarifier to the wastewater purification tank for further purification and filtration until the discharged water quality is normal.

[0046] In summary, the present invention has a novel structural design, enabling multi-stage purification treatment of power plant wastewater with low treatment costs. It solves the problems of insufficient wastewater treatment and high costs in existing wastewater treatment equipment in thermal power plants. In addition, the treatment device has good environmental performance, can be recycled, and has a long service life.

[0047] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve any improvement to the software and methods.

[0048] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wastewater treatment device for power plants, characterized in that: The treatment device includes a sewage pretreatment tank (1), a sewage sedimentation tank (2), a sewage purification tank (3), a sewage aeration tank (4), and a clarification tank (5). The sewage pretreatment tank (1) is equipped with a sewage inlet pipe (6) at its inlet end. A multi-stage impurity filter screen assembly (7) is installed inside the sewage pretreatment tank (1). The outlet end of the sewage pretreatment tank (1) is connected to the inlet end of the sewage sedimentation tank (2) through a first pipe (8). The outlet end of the sewage sedimentation tank (2) is connected to the inlet end of the sewage purification tank (3) through a second pipe (9). The outlet end of the sewage purification tank (3) is connected to the inlet end of the sewage aeration tank (4) through a third pipe (10). The outlet end of the sewage aeration tank (4) is connected to the inlet end of the clarification tank (5) through a fourth pipe (11). The outlet end of the clarification tank (5) is equipped with a discharge pipe (12).

2. The wastewater treatment device for power plants according to claim 1, characterized in that: The wastewater pretreatment tank (1) has an insertion slot (13) installed on its upper surface. The multi-stage impurity filter assembly (7) includes a mesh frame (14), a first coarse wire mesh (15), a first filter plate (16), a second coarse wire mesh (17), a second filter plate (18), and a fine wire mesh (19). The first coarse wire mesh (15), the first filter plate (16), the second coarse wire mesh (17), the second filter plate (18), and the fine wire mesh (19) are installed in sequence in the mesh frame (14). An impurity collection tank (20) is installed below the wastewater pretreatment tank (1).

3. The wastewater treatment device for power plants according to claim 1, characterized in that: The upper end of the sewage sedimentation tank (2) is equipped with a precipitant feeding hopper (21). The sewage sedimentation tank (2) is equipped with a stirring assembly inside. The lower end of the sewage sedimentation tank (2) is provided with a sedimentation chamber (22). The stirring assembly includes a stirring shaft (23), a stirring motor (24), and a stirring rod (25). The stirring shaft (23) is installed longitudinally inside the sewage sedimentation tank (2). The stirring motor (24) is installed on the upper end of the sewage sedimentation tank (2). The stirring rod (25) is perpendicular to the outer wall of the stirring shaft (23). The motor shaft of the stirring motor (24) is connected to the end of the stirring shaft (23) for transmission.

4. A wastewater treatment device for power plants according to claim 3, characterized in that: The precipitant components added to the precipitant feeding hopper include, by weight, 20-40 parts of nano-calcium oxide, 5-10 parts of modified potassium hydroxide, 10-20 parts of calcium carbonate, 6-12 parts of diatomaceous earth, 8-20 parts of activated carbon particles, 10-20 parts of nano-zinc oxide, 12-24 parts of nano-alumina, and 4-10 parts of nano-silver particle powder.

5. A wastewater treatment device for power plants according to claim 1, characterized in that: The wastewater purification tank (3) is equipped with a wastewater purification filter element (26). The wastewater purification filter element (26) includes a filter frame (27), a first activated carbon filter (28), a non-woven fabric (29), a graphene filter (30), a second activated carbon filter (31), and a diatomite filter (32). The first activated carbon filter (28), the non-woven fabric (29), the graphene filter (30), the second activated carbon filter (31), and the diatomite filter (32) are fixed in sequence inside the filter frame (27).

6. A wastewater treatment device for power plants according to claim 1, characterized in that: An aeration assembly (33) is installed inside the wastewater aeration box (4). The aeration assembly (33) includes an aeration pipe (34). One end of the aeration pipe (34) is provided with an air inlet (35), and the other end is provided with an air outlet (36). A first cylindrical cavity (37) and a second cylindrical cavity (38) are respectively provided in the inner cavity of the aeration pipe (34). The first cylindrical cavity (37) is vertically arranged and located on one side of the air inlet (35). The second cylindrical cavity (38) is horizontally arranged between the first cylindrical cavity (37) and the air outlet (36). The inner wall of the first cylindrical cavity (37) is also coated with a porous material (39).

7. A wastewater treatment device for power plants according to claim 1, characterized in that: The clarifier (5) is also equipped with a filter plate (40) inside the cavity. A water quality tester (41) is installed on one side of the clarifier (5). The water quality tester (41) is connected to an external monitoring and control terminal (42).

8. A wastewater treatment device for power plants according to claim 1, characterized in that: It also includes a return assembly, which includes a return water pipe (43) and a return water pump (44). The return water pipe (43) is installed between the clarifier (5) and the wastewater purification tank (3). The return water pump (44) is installed on the return water pipe (43) and is connected to an external monitoring and control terminal (42) of the return water pump (44).

9. A treatment method for a power plant wastewater treatment device as described in claim 1, characterized in that: The processing method includes the following steps: A. Wastewater from the power plant enters the wastewater pretreatment tank through the wastewater inlet pipe. The multi-stage impurity filter assembly in the wastewater pretreatment tank performs preliminary filtration of large particulate impurities in the wastewater. B. After impurities are filtered, the wastewater is discharged into the wastewater sedimentation tank. The precipitant is added to the precipitant in the precipitant tank and mixed with the wastewater to react and settle. The precipitate falls into the sedimentation chamber below. C. The settled wastewater is discharged into the wastewater purification tank, where it undergoes efficient adsorption and filtration through the wastewater purification filter element; D. The purified wastewater is discharged into the wastewater aeration tank, where the aeration components complete the oxygenation process and enhance the contact between organic matter and microorganisms in the wastewater and dissolved oxygen, thereby oxidizing and decomposing the organic matter in the wastewater. E. After aeration, the water is discharged into the clarification tank. Fine particles in the sewage settle due to gravity. The water quality tester detects the water quality and provides feedback on the test parameters. F. If the water quality is found to be unacceptable, the return water pump will be turned on, and the water will be returned from the clarifier to the wastewater purification tank for further purification and filtration until the discharged water quality is normal.

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