A stepped filtration wastewater treatment and purification device

Abstract

A stepped filtration wastewater treatment and purification device, relating to the field of wastewater purification equipment technology, solves the problems of weak removal capacity for heavy metal ions and organic matter, and difficulty in purifying complex wastewater in existing technologies. It includes an electrochemical reaction tank, a flocculation reaction tank, a sedimentation tank, and an aeration reaction tank connected sequentially by pipelines. The electrochemical reaction tank includes a reagent reaction tank and an electrochemical tank, with a reactor installed in the electrochemical tank. The flocculation reaction tank contains a coagulation tank, a magnetic mixing tank, and a coagulation aid tank sequentially. A baffle plate is connected to the fourth flow guide in the sedimentation tank, with a filter screen connected to the lower end of the baffle plate. An air supply pipe is connected to the bottom of the aeration reaction tank, with multiple branch pipes evenly connected to the air supply pipe, each branch pipe having an aeration head connected to its end. The beneficial effects are: improved heavy metal removal rate and degradation rate of recalcitrant organic matter, and the ability to handle the diverse pollutants in complex wastewater.

Description

Technical Field

[0001] This utility model relates to the technical field of sewage purification equipment, specifically a stepped filtration sewage treatment and purification device. Background Technology

[0002] With the continuous expansion of industrial production and the rapid advancement of urbanization, the discharge of domestic sewage and industrial wastewater has been increasing year by year. Water pollution has become a key factor restricting the sustainable development of the ecological environment. Efficient and stable sewage treatment technology is the core means to achieve water resource recycling.

[0003] Current wastewater treatment devices, such as the multi-stage combined wastewater treatment equipment disclosed in patent application number "CN202110092675.3", include a support frame, with a water storage tank fixed inside the frame. A conveying assembly is connected to one side of the water storage tank, which is connected to an aeration box via the conveying assembly. An aeration assembly is connected to the top of the aeration box, and a sludge recovery assembly is connected to the bottom of the aeration box. An anaerobic chamber is connected to one side of the aeration box via a pump, and the bottom of the anaerobic chamber is fixed to the top surface of the support frame. The aeration assembly includes a dryer, which is fixed to the top surface of the aeration box. A heat pump is connected to one side of the dryer, and an aeration pipe is connected to the end of the heat pump away from the dryer. The sludge recovery assembly includes a sedimentation chamber, with a sludge storage chamber connected to one side of the sedimentation chamber. An auger is rotatably connected inside the sedimentation chamber via a bearing, and the bottom of the sludge storage chamber is connected to the water storage tank. However, this invention has weak removal capabilities for heavy metal ions and recalcitrant organic matter in wastewater, and is difficult to purify wastewater with complex compositions.

[0004] Therefore, this utility model proposes a stepped filtration wastewater treatment and purification device to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a stepped filtration wastewater treatment and purification device to solve the problems of weak removal capacity of heavy metal ions and organic matter and difficulty in purifying complex wastewater in the prior art.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A stepped filtration wastewater treatment and purification device includes an electrochemical reaction tank, a flocculation reaction tank, a sedimentation tank, and an aeration reaction tank connected sequentially by pipelines. The bottom of one end of the electrochemical reaction tank is connected to a first inlet, and the top of the other end is connected to a first outlet. The electrochemical reaction tank includes a reagent reaction tank and an electrochemical tank. The first inlet is connected to the reagent reaction tank, and the first outlet is connected to the electrochemical tank. A first partition plate is provided between the reagent reaction tank and the electrochemical tank, and a first guide port is opened at the lower end of the first partition plate. A reactor is installed in the electrochemical tank and connected to the top of the electrochemical reaction tank. The flocculation reaction tank contains a coagulation tank, a magnetic mixing tank, and an aeration reaction tank connected sequentially. The flocculation reaction tank has a second inlet at one end and a settling tank at the other end. The settling tank is connected to the flocculation reaction tank via a fourth guide port at the upper end of the flocculation reaction tank. A baffle plate is connected to the fourth guide port in the settling tank, and a filter screen is connected to the lower end of the baffle plate. A second drain outlet is connected to the upper end of the settling tank corresponding to the filter screen. The aeration reaction tank has a third inlet and a third drain outlet at the top. An air supply pipe is connected to the bottom of the aeration reaction tank, and multiple branch pipes are evenly connected to the air supply pipe. Each branch pipe is connected to an aeration head at its end, and the aeration heads are all connected to the inner bottom wall of the aeration reaction tank.

[0008] Furthermore, a first inner tube is provided inside the reagent reaction tank, and a gap is provided between the lower end of the first inner tube and the bottom wall of the electrochemical reaction tank. A stirring assembly is provided inside the first inner tube, and the stirring assembly is fixedly connected to the electrochemical reaction tank. A water outlet is provided at the upper end of the first inner tube.

[0009] Furthermore, the second water inlet is connected to the coagulation tank, a second partition plate is provided between the coagulation tank and the magnetic mixing tank, a second guide port is provided at the upper end of the second partition plate, a third partition plate is provided between the magnetic mixing tank and the coagulation aid tank, a third guide port is provided at the lower end of the third partition plate, and stirring components are correspondingly provided in the coagulation tank, the magnetic mixing tank and the coagulation aid tank, and the stirring components are fixedly connected to the flocculation reaction tank.

[0010] Furthermore, the stirring assembly includes a first drive motor and an impeller, the impeller being fixedly connected to the drive shaft of the first drive motor.

[0011] Furthermore, the bottom of the sedimentation tank is conical, and a sludge scraper is provided on its inner side. The sludge scraper is in contact with the bottom wall of the sedimentation tank. A second drive motor is connected to the sedimentation tank, and the drive shaft connected to the second drive motor is connected to the middle of the sludge scraper. A discharge port is opened at the bottom of the sedimentation tank, and a magnetic sludge pump is connected to the discharge port.

[0012] Furthermore, the baffle plate is detachably connected to the sedimentation tank. Two sets of snap-fit ​​components are symmetrically arranged on the baffle plate. Each snap-fit ​​component includes a snap-fit ​​block. A snap-fit ​​groove is correspondingly provided on the sedimentation tank. A sliding groove is opened in the baffle plate corresponding to the snap-fit ​​block. The snap-fit ​​block is slidably connected in the sliding groove. A tension spring is connected between the snap-fit ​​block and the sliding groove.

[0013] Furthermore, a second inner pipe is provided inside the aeration reaction tank, and a gap is provided between the lower end of the second inner pipe and the bottom wall of the aeration reaction tank. The third water inlet is connected to the second inner pipe.

[0014] In summary, compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model can achieve uniform mixing of the reaction agent and wastewater through the first inner tube stirring assembly in the reaction tank, initially realizing the chelation and solidification of heavy metal ions and the oxidative decomposition of some organic matter; then, through electrolytic oxidation / reduction reaction, it further degrades the recalcitrant organic matter and enhances the precipitation and adsorption of heavy metal ions, thus completing the pretreatment, improving the heavy metal removal rate and the degradation rate of recalcitrant organic matter, and can handle the problem of diverse pollutants in complex wastewater.

[0016] 2. This utility model can achieve efficient agglomeration of pollutants by adopting a stepped tank design of "coagulation-magnetic mixing-coagulation aid" in the flocculation reaction tank. The coagulation tank forms tiny flocs to adsorb suspended pollutants, and the magnetic mixing tank adds magnetic particles to form high-density magnetic flocs.

[0017] 3. The bottom of the sedimentation tank of this utility model is conical, which is conducive to the accumulation of sludge. The drive shaft of the second drive motor drives the scraper blades that are attached to the bottom wall of the tank to rotate, scraping the magnetic sludge accumulated at the bottom of the cone to the discharge port in the center of the tank bottom. Finally, the sludge is pumped out through the magnetic sludge pump at the discharge port, thus avoiding sludge accumulation.

[0018] 4. The sedimentation tank baffle of this utility model adopts a detachable snap-fit ​​component, which does not require complicated tools for disassembly and assembly, and facilitates the cleaning and replacement of the filter screen.

[0019] 5. In the aeration reaction tank of this utility model, water is evenly distributed through the second inner tube, and the aeration head disperses the gas into tiny bubbles, which fully contact the wastewater in the tank. This provides oxygen for aerobic microorganisms, degrades residual organic matter, and further removes trace amounts of reducing pollutants in the water through aeration oxidation.

[0020] 6. The stirring components in the multiple reaction tanks of this utility model can ensure the uniformity of mixing of the reaction agents, coagulants, magnetic particles, coagulant aids and wastewater. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention;

[0022] Figure 2 This is a top view of the present invention;

[0023] Figure 3 This is a partial cross-sectional view of the main view of this utility model;

[0024] Figure 4 This is a partial cross-sectional view of the right side of this utility model;

[0025] In the diagram: 1. Electrochemical reaction tank; 2. First inlet; 3. First outlet; 4. Reagent reaction tank; 5. Electrochemical tank; 6. First partition plate; 7. First guide port; 8. Reactor; 9. First inner pipe; 10. Stirring assembly; 11. Flocculation reaction tank; 12. Coagulation tank; 13. Magnetic mixing tank; 14. Coagulation aid tank; 15. Second inlet; 16. Second partition plate; 17. Second guide port; 18. Third partition plate; 19. Third guide port; 20. First 21. Drive motor; 22. Impeller; 23. Sedimentation tank; 24. Fourth guide port; 25. Baffle plate; 26. Filter screen; 27. Second drain outlet; 28. Snap-fit ​​block; 29. ​​Snap-fit ​​groove; 30. Sliding groove; 31. Tension spring; 32. Sludge scraper; 33. Second drive motor; 34. Magnetic sludge pump; 35. Aeration reaction tank; 36. Third inlet; 37. Third drain outlet; 38. Air supply pipe; 39. Branch pipe; 40. Aeration head; 41. Second inner pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In this application, the terms "upper," "inner," "outer," "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0028] like Figure 1-3As shown, a stepped filtration wastewater treatment and purification device includes an electrochemical reaction tank 1, a flocculation reaction tank 11, a sedimentation tank 22, and an aeration reaction tank 34 connected sequentially by pipes. The bottom of one end of the electrochemical reaction tank 1 is connected to a first inlet 2, and the top of the other end is connected to a first outlet 3. The electrochemical reaction tank 1 includes a reagent reaction tank 4 and an electrochemical tank 5. The first inlet 2 is connected to the reagent reaction tank 4, and the first outlet 3 is connected to the electrochemical tank 5. A first partition plate 6 is provided between the reagent reaction tank 4 and the electrochemical tank 5. A first guide port 7 is opened at the lower end of the first partition plate 6. A reactor 8 is installed inside the electrochemical tank 5 and is connected to the top of the electrochemical reaction tank 1. A first inner tube 9 is installed inside the reagent reaction tank 4. A gap is provided between the lower end of the first inner tube 9 and the bottom wall of the electrochemical reaction tank 1. A stirring assembly 10 is installed inside the first inner tube 9 and is fixedly connected to the electrochemical reaction tank 1. An outlet is opened at the upper end of the first inner tube 9.

[0029] like Figure 3 As shown, the flocculation reaction tank 11 is sequentially equipped with a coagulation tank 12, a magnetic mixing tank 13, and a coagulation aid tank 14. A second inlet 15 is connected to the bottom of one end of the flocculation reaction tank 11, and the second inlet 15 is connected to the coagulation tank 12. A second partition plate 16 is provided between the coagulation tank 12 and the magnetic mixing tank 13, and a second guide port 17 is opened at the upper end of the second partition plate 16. A third partition plate 18 is provided between the magnetic mixing tank 13 and the coagulation aid tank 14, and a third guide port 19 is opened at the lower end of the third partition plate 18. A stirring assembly 10 is correspondingly provided in each of the coagulation tank 12, the magnetic mixing tank 13, and the coagulation aid tank 14, and the stirring assembly 10 is fixedly connected to the flocculation reaction tank 11. The stirring assembly 10 includes a first drive motor 20 and an impeller 21, with the impeller 21 fixedly connected to the drive shaft of the first drive motor 20.

[0030] like Figure 3 and Figure 4 As shown, the other end of the flocculation reaction tank 11 is connected to the sedimentation tank 22. The sedimentation tank 22 is connected to the coagulation aid tank 14 through the fourth guide port 23 opened at the upper end of the flocculation reaction tank 11. A baffle plate 24 is connected to the fourth guide port 23 in the sedimentation tank 22. A filter screen 25 is connected to the lower end of the baffle plate 24. A second drain port 26 is connected to the upper end of the sedimentation tank 22 corresponding to the filter screen 25. The baffle plate 24 and the sedimentation tank 22 are detachably connected. Two sets of snap-fit ​​components are symmetrically arranged on the baffle plate 24. The snap-fit ​​components include snap-fit ​​blocks 27. A snap-fit ​​groove 28 is correspondingly arranged on the sedimentation tank 22. A sliding groove 29 is opened in the baffle plate 24 corresponding to the snap-fit ​​block 27. The snap-fit ​​block 27 is slidably connected in the sliding groove 29. A tension spring 30 is connected between the snap-fit ​​block 27 and the sliding groove 29.

[0031] Furthermore, the bottom of the sedimentation tank 22 is conical, and a sludge scraper 31 is provided on its inner side. The sludge scraper 31 is attached to the bottom wall of the sedimentation tank 22. A second drive motor 32 is connected to the sedimentation tank 22, and the drive shaft connected to the second drive motor 32 is connected to the middle of the sludge scraper 31. A discharge port is opened at the bottom of the sedimentation tank 22, and a magnetic sludge pump 33 is connected to the discharge port.

[0032] Furthermore, the top of the aeration reaction tank 34 is connected to a third inlet 35 and a third outlet 36, respectively. The bottom of the aeration reaction tank 34 is connected to an air supply pipe 37, on which multiple branch pipes 38 are evenly connected. Each branch pipe 38 has an aeration head 39 connected to its end, and the aeration heads 39 are all connected to the inner bottom wall of the aeration reaction tank 34. A second inner pipe 40 is installed inside the aeration reaction tank 34, with a gap between the lower end of the second inner pipe 40 and the bottom wall of the aeration reaction tank 34. The third inlet 35 is connected to the second inner pipe 40.

[0033] The working process of this utility model is as follows:

[0034] First, the wastewater to be treated enters the reagent reaction tank 4 through the first inlet 2 at the bottom of one end of the electrochemical reaction tank 1. Simultaneously, reagents are added into the reagent reaction tank 4, and the stirring assembly 10 inside the first inner tube 9 is activated. The first drive motor 20, fixed to the electrochemical reaction tank 1, drives the impeller 21 to rotate, causing the wastewater to flow into the first inner tube 9 and out through the outlet at the top of the first inner tube 9. This process thoroughly mixes the pre-set reagents with the wastewater, initially achieving the chelation and solidification of heavy metal ions and the oxidative decomposition of some organic matter. Then, the wastewater flows into the electrochemical tank 5 through the first guide port 7 at the lower end of the first partition plate 6. The reactor 8 inside the electrochemical tank 5 is powered on, further degrading recalcitrant organic matter through electrolytic oxidation / reduction reactions and enhancing the precipitation and adsorption of heavy metal ions, completing the pretreatment. Finally, the electrochemically treated wastewater is discharged from the first drain port 3 at the top of the other end of the electrochemical reaction tank 1 and enters the flocculation reaction tank 11.

[0035] The wastewater then enters the coagulation tank 12 through the second inlet 15 at the bottom of one end of the flocculation reaction tank 11. The stirring component 10 in the tank is activated, and coagulant is added to the wastewater. Through stirring, the coagulant and wastewater are evenly mixed to form tiny flocs, which initially adsorb suspended pollutants in the water. The coagulated wastewater then enters the magnetic mixing tank 13 through the second guide port 17 at the upper end of the second partition plate 16. The stirring component 10 in the tank continues to work, and magnetic particles are added. The magnetic particles combine with the tiny flocs to form magnetic flocs, which increases the subsequent settling velocity. The magnetically mixed wastewater then enters the coagulation aid tank 14 through the third guide port 19 at the lower end of the third partition plate 18. The stirring component 10 in the coagulation aid tank 14 is activated, and coagulation aid is added. The coagulation aid promotes further agglomeration of the magnetic flocs, forming larger and denser stable flocs, laying the foundation for subsequent sedimentation and separation.

[0036] The flocculated wastewater then flows into the settling tank 22 through the fourth guide port 23. The wastewater flows slowly in the settling tank 22, and the magnetic flocs, due to their high density, settle rapidly to the bottom of the tank by gravity. The bottom of the settling tank 22 is conical, which is conducive to the accumulation of sludge. The supernatant passes through the settling tank 22 and is screened out through the filter screen 25, and is discharged from the second drain port 26 at the top, entering the aeration reaction tank 34.

[0037] The settled clear liquid then enters the second inner pipe 40 through the third inlet 35. A gap is maintained between the lower end of the second inner pipe 40 and the bottom of the tank, and the wastewater slowly overflows from the gap at the lower end of the inner pipe to achieve uniform water distribution. Gas is continuously introduced through the air supply pipe 37 at the bottom of the aeration reaction tank 34. The gas is transported to each aeration head 39 through the evenly distributed branch pipes 38 on the air supply pipe 37. The aeration head 39 breaks the gas into tiny bubbles, which fully contact the wastewater in the tank, providing oxygen for aerobic microorganisms, degrading residual organic matter, and further removing trace amounts of reducing pollutants in the water through aeration oxidation. After deep treatment by aeration, the qualified wastewater is discharged from the third outlet 36 at the top of the aeration reaction tank 34, completing the entire step filtration and purification process.

[0038] After settling is completed, the second drive motor 32 on the settling tank 22 is started. The drive shaft of the second drive motor 32 drives the scraper blade 31 that is attached to the bottom wall of the tank to rotate, scraping the magnetic sludge gathered at the bottom of the cone to the discharge port at the center of the bottom of the tank. Finally, the sludge is pumped out through the magnetic sludge pump 33 at the discharge port to avoid sludge accumulation.

[0039] When the filter screen 25 needs to be replaced, press the locking block 27 in the locking groove 28 on both sides. The block slides along the sliding groove 29 into the baffle plate 24 under pressure, stretching the tension spring 30 until the locking block 27 is completely disengaged from the locking groove 28. After the locking block 27 is disengaged from the locking groove 28, remove the baffle plate 24 from the sedimentation tank 22. After cleaning / replacing, repeat the operation to fix the baffle plate 24 back into the sedimentation tank 22.

Claims

1. A stepped filtration wastewater treatment and purification device, comprising an electrochemical reaction tank (1), a flocculation reaction tank (11), a sedimentation tank (22), and an aeration reaction tank (34) connected sequentially by pipelines, characterized in that, The electrochemical reaction tank (1) has a first water inlet (2) at the bottom of one end and a first drain outlet (3) at the top of the other end. The electrochemical reaction tank (1) includes a reagent reaction tank (4) and an electrochemical tank (5). The first water inlet (2) is connected to the reagent reaction tank (4), and the first drain outlet (3) is connected to the electrochemical tank (5). A first partition plate (6) is provided between the reagent reaction tank (4) and the electrochemical tank (5). A first guide port (7) is opened at the lower end of the first partition plate (6). A reactor (8) is provided in the electrochemical tank (5), and the reactor (8) is connected to the top of the electrochemical reaction tank (1). The flocculation reaction tank (11) is provided with a coagulation tank (12), a magnetic mixing tank (13) and a coagulation aid tank (14) in sequence. A second water inlet (15) is connected to the bottom of one end of the flocculation reaction tank (11), and a sedimentation tank (22) is connected to the other end of the flocculation reaction tank (11). The sedimentation tank (22) is connected to the coagulation aid tank (14) through a fourth guide port (23) opened at the upper end of the flocculation reaction tank (11). A baffle plate (24) is connected to the fourth guide port (23) in the sedimentation tank (22). A filter screen (25) is connected to the lower end of the baffle plate (24). A second drain outlet (26) is connected to the upper end of the sedimentation tank (22) corresponding to the filter screen (25). The top of the aeration reaction tank (34) is connected to a third inlet (35) and a third outlet (36), respectively. The bottom of the aeration reaction tank (34) is connected to an air supply pipe (37). Multiple branch pipes (38) are evenly connected to the air supply pipe (37). The ends of the branch pipes (38) are all connected to aeration heads (39). The aeration heads (39) are all connected to the inner bottom wall of the aeration reaction tank (34).

2. The stepped filtration wastewater treatment and purification device according to claim 1, characterized in that, The reagent reaction tank (4) is provided with a first inner tube (9). The lower end of the first inner tube (9) is provided with a gap between it and the bottom wall of the electrochemical reaction tank (1). The first inner tube (9) is provided with a stirring assembly (10). The stirring assembly (10) is fixedly connected to the electrochemical reaction tank (1). The upper end of the first inner tube (9) is provided with a water outlet.

3. The stepped filtration wastewater treatment and purification device according to claim 2, characterized in that, The second water inlet (15) is connected to the coagulation tank (12). A second partition plate (16) is provided between the coagulation tank (12) and the magnetic mixing tank (13). A second guide port (17) is provided at the upper end of the second partition plate (16). A third partition plate (18) is provided between the magnetic mixing tank (13) and the coagulation aid tank (14). A third guide port (19) is provided at the lower end of the third partition plate (18). A stirring assembly (10) is provided in each of the coagulation tank (12), the magnetic mixing tank (13), and the coagulation aid tank (14). The stirring assembly (10) is fixedly connected to the flocculation reaction tank (11).

4. The stepped filtration wastewater treatment and purification device according to claim 3, characterized in that, The stirring assembly (10) includes a first drive motor (20) and an impeller (21), wherein the impeller (21) is fixedly connected to the drive shaft of the first drive motor (20).

5. The stepped filtration wastewater treatment and purification device according to claim 1, characterized in that, The bottom of the sedimentation tank (22) is conical, and a sludge scraper (31) is provided on its inner side. The sludge scraper (31) is attached to the bottom wall of the sedimentation tank (22). A second drive motor (32) is connected to the sedimentation tank (22), and the drive shaft connected to the second drive motor (32) is connected to the middle of the sludge scraper (31). A discharge port is opened at the bottom of the sedimentation tank (22), and a magnetic sludge pump (33) is connected to the discharge port.

6. The stepped filtration wastewater treatment and purification device according to claim 1, characterized in that, The baffle plate (24) is detachably connected to the sedimentation tank (22). Two sets of snap-fit ​​components are symmetrically arranged on the baffle plate (24). The snap-fit ​​components include snap-fit ​​blocks (27). The sedimentation tank (22) is provided with a corresponding snap-fit ​​groove (28). A sliding groove (29) is opened in the baffle plate (24) corresponding to the snap-fit ​​block (27). The snap-fit ​​block (27) is slidably connected in the sliding groove (29). A tension spring (30) is connected between the snap-fit ​​block (27) and the sliding groove (29).

7. The stepped filtration wastewater treatment and purification device according to claim 1, characterized in that, The aeration reaction tank (34) is provided with a second inner pipe (40), and there is a gap between the lower end of the second inner pipe (40) and the bottom wall of the aeration reaction tank (34). The third water inlet (35) is connected to the second inner pipe (40).

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