Zero discharge treatment process for industrial wastewater based on nano calcium carbonate production

Abstract

This invention discloses a zero-discharge treatment process for industrial wastewater from nano-calcium carbonate production, comprising the following steps: a. conveying industrial wastewater from nano-calcium carbonate production into a sedimentation tank; b. adding polyaluminum sulfate to the sedimentation tank and stirring to lower the pH of the industrial wastewater; c. then adding polyaluminum chloride to the sedimentation tank and stirring to perform adsorption and coagulation. If there are few flocs and a large amount of residual turbidity in the sedimentation tank, the dosage is too small; if the flocs are large and rise to the surface, the dosage is too large, and adjustments should be made accordingly. In this invention, the wastewater obtained after this wastewater treatment process will meet the standards for recycling and reuse, achieving zero discharge of wastewater from nano-calcium carbonate production. This process is simpler and more efficient than traditional wastewater treatment processes, effectively solving the pain points of high energy consumption and high cost of traditional processes, while also conforming to green and sustainable development.

Description

Technical Field

[0001] This invention relates to the field of nano-calcium carbonate production technology, and in particular to a zero-discharge treatment process for industrial wastewater based on nano-calcium carbonate production. Background Technology

[0002] The industrial wastewater generated during the production of nano-calcium carbonate has long been a major problem for enterprises, with 6.8 to 15.2 tons of wastewater being discharged for every ton of nano-calcium carbonate produced. Typically, nano-calcium carbonate companies reduce the COD of the wastewater through biochemical processes, oxidation, and membrane filtration, but this method is energy-intensive and costly, and does not conform to green and sustainable development.

[0003] To address the shortcomings of the above-mentioned wastewater treatment processes, this invention proposes to purify the wastewater generated during the production of nano-calcium carbonate by coupling flocculation, filtration, and flotation methods, so that it meets the requirements for reuse, and explores a new zero-discharge process for wastewater from the production of nano-calcium carbonate. Summary of the Invention

[0004] The purpose of this invention is to propose a zero-discharge treatment process for industrial wastewater based on the production of nano-calcium carbonate in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The zero-discharge treatment process for industrial wastewater produced from nano-calcium carbonate includes the following steps:

[0007] a. Transporting industrial wastewater produced based on nano-calcium carbonate to a sedimentation tank;

[0008] b. Add polyaluminum sulfate to the sedimentation tank and stir to lower the pH of the industrial wastewater;

[0009] c. Then add polyaluminum chloride to the sedimentation tank and stir to carry out adsorption and coagulation. If there are few flocs and a lot of residual turbidity in the sedimentation tank, the dosage is too small. If the flocs in the sedimentation tank are large and rise to the surface, the dosage is too large and should be adjusted appropriately.

[0010] d. Next, add polyacrylamide to the sedimentation tank and stir thoroughly to flocculate and form sediment;

[0011] e. Finally, filtration is performed to remove the precipitate, yielding the treated wastewater solution.

[0012] The stirring equipment involved in steps b, c, and d includes two guide rods fixed to the sedimentation tank by columns. Each guide rod is fitted with a movable block. A drive shaft passes through the two movable blocks and a movable wheel is mounted on the drive shaft. A motor is fixed on each movable block. Side plates are fixed on each movable block. The side plates have through grooves to avoid the drive shaft. A stirring shaft is provided between the two side plates and a stirring blade is fixed on the stirring shaft. A driven gear is fixed on the stirring shaft. The side plates have a drive component that acts on the driven gear to make the stirring shaft rotate continuously clockwise and counterclockwise.

[0013] As a further description of the above technical solution:

[0014] The driving component includes a shaft that passes through the side plate. One end of the shaft is connected to the drive shaft via a belt drive, and the other end is fixed with a half gear. A protrusion is fixed on the side plate. A movable frame is provided between the protrusions, with its inner wall meshing with the half gear and its outer wall meshing with the driven gear. A guide rod passes through the movable frame.

[0015] As a further description of the above technical solution:

[0016] The side plate and the movable block are fixedly connected by bolts.

[0017] As a further description of the above technical solution:

[0018] A movable plate with an anti-detachment block at its end is passed through between the two side plates. The side wall of the movable plate has an arc-shaped paddle. The side plate is provided with a driving component two for driving the movable plate to reciprocate.

[0019] As a further description of the above technical solution:

[0020] The movable plate and the lever are integrally formed.

[0021] As a further description of the above technical solution:

[0022] The second driving component includes a fastening plate fixed between two side plates. A rotating arm is rotatably connected to the fastening plate. The rotating arm has a strip groove and a toothed disc that meshes with the moving plate. A bracket is fixed to the side plate. A second shaft passes through the bracket. A first bevel tooth is fixed to one end of the second shaft, and a turntable is installed at the other end. A movable pin that passes through the strip groove is formed on the turntable. A second bevel tooth that meshes with the first bevel tooth is installed on the stirring shaft.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. In this invention, the wastewater obtained through this wastewater treatment process will meet the standards for recycling and reuse, achieving zero discharge of wastewater from the production of nano-calcium carbonate. This process is simpler and more efficient than traditional wastewater treatment processes, effectively solving the pain points of high energy consumption and high cost of traditional processes, while also conforming to green and sustainable development.

[0025] 2. In this invention, the stirring equipment involved in the wastewater treatment process can achieve stirring at different positions in the sedimentation tank through the output of only one motor. Compared with the stirring equipment in the prior art, the stirring effect is better, the stirring efficiency is higher, and it is more convenient and simple to use. Attached Figure Description

[0026] Figure 1 A schematic diagram showing the distribution of the stirring equipment and sedimentation tank according to an embodiment of the present invention is shown;

[0027] Figure 2 The present invention provides an embodiment of the invention. Figure 1 Schematic diagram of the AA section structure;

[0028] Figure 3 The present invention provides an embodiment of the invention. Figure 2 Schematic diagram of the BB section structure;

[0029] Figure 4 A top view of the movable plate structure provided according to an embodiment of the present invention is shown;

[0030] Figure 5 A schematic diagram of the connection structure between bevel tooth one and bevel tooth two provided according to an embodiment of the present invention is shown;

[0031] Legend:

[0032] 1. Column; 2. Guide rod one; 3. Moving block; 4. Side plate; 5. Moving wheel; 6. Stirring shaft; 7. Stirring blade; 8. Drive shaft; 9. Strip groove; 10. Shaft one; 11. Belt; 12. Through groove; 13. Motor; 14. Driven gear; 15. Bracket; 16. Gear disc; 17. Rotating arm; 18. Fastening plate; 19. Paddle; 20. Moving plate; 21. Anti-detachment block; 22. Protrusion; 23. Guide rod two; 24. Moving frame; 25. Bevel gear one; 26. Half gear; 27. Turntable; 28. Moving pin; 29. ​​Bevel gear two; 30. Shaft two. Detailed Implementation

[0033] 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.

[0034] Please see Figure 1-5 This invention provides a technical solution: a zero-discharge treatment process for industrial wastewater produced from nano-calcium carbonate, comprising the following steps:

[0035] a. Transporting industrial wastewater produced based on nano-calcium carbonate to a sedimentation tank;

[0036] b. Add polyaluminum sulfate to the sedimentation tank and stir to lower the pH of the industrial wastewater to around 7.

[0037] c. Then add polyaluminum chloride to the sedimentation tank and stir to carry out adsorption and coagulation. If there are few flocs and a lot of residual turbidity in the sedimentation tank, the dosage is too small. If the flocs in the sedimentation tank are large and rise to the surface, the dosage is too large and should be adjusted appropriately.

[0038] d. Next, add polyacrylamide to the sedimentation tank and stir thoroughly to flocculate and form sediment;

[0039] e. Finally, filtration is performed to remove the precipitate, yielding the treated wastewater solution.

[0040] The stirring equipment involved in steps b, c, and d includes two guide rods 2 fixed to the sedimentation tank by a column 1. Each guide rod 2 is fitted with a movable block 3, which slides within the guide rod 2. A drive shaft 8 passes through the two movable blocks 3, and a movable wheel 5 is mounted on the drive shaft 8. The drive shaft 8 and the movable blocks 3 are rotatably connected via bearings. A motor 13 is fixed to each movable block 3, and the output shaft of the motor 13 is connected to the drive shaft 8 for driving the drive shaft 8. The two moving blocks 3 are fixed with side plates 4. The side plates 4 are fixed to the moving blocks 3 by bolts. The side plates 4 have through grooves 12 to avoid the drive shaft 8. The drive shaft 8 is clearance-fitted with the through grooves 12. A stirring shaft 6 is provided between the two side plates 4 and a stirring blade 7 is fixed on the stirring shaft 6. The stirring blade 7 can rotate with the stirring shaft 6. A driven gear 14 is fixed on the stirring shaft 6. The side plates 4 have a drive component that acts on the driven gear 14 to make the stirring shaft 6 rotate continuously clockwise and counterclockwise.

[0041] Specifically, such as Figure 2 and Figure 3As shown, the driving component includes a shaft 10 that passes through the side plate 4. The shaft 10 is rotatably connected to the side plate 4 via a bearing. One end of the shaft 10 is connected to the drive shaft 8 via a belt 11, and the other end is fixed with a half gear 26. The half gear 26 has a short continuous tooth. Both the shaft 10 and the drive shaft 8 are equipped with pulleys. The side plate 4 is fixed with a protrusion 22. Between the protrusions 22, there is a movable frame 24 whose inner wall meshes with the half gear 26 and whose outer wall meshes with the driven gear 14. During the rotation of the half gear 26, the half gear 26 meshes with the inner walls of the two sides of the movable frame 24 respectively, so that the movable frame 24 reciprocates along the axial direction of the guide rod 23. The guide rod 23 passes through the movable frame 24 and is fixedly connected to the protrusion 22. The movable frame 24 and the guide rod 23 are in sliding fit.

[0042] Specifically, such as Figure 2 and Figure 4 As shown, a movable plate 20 with an anti-detachment block 21 at the end passes through between the two side plates 4. The movable plate 20 slides with the side plate 4. The side wall of the movable plate 20 has an arc-shaped paddle 19. The paddles 19 on both sides of the movable plate 20 face opposite directions. As the paddles 19 move with the movable plate 20, they can move the water back and forth, which helps to stir the sedimentation tank. The side plate 4 is provided with a driving component 2 to drive the movable plate 20 to move back and forth.

[0043] Specifically, such as Figure 4 As shown, the movable plate 20 and the lever 19 are integrally formed, which avoids the generation of other stresses and has higher stability.

[0044] Specifically, such as Figure 2 and Figure 5 As shown, the second driving component includes a fastening plate 18 fixed between two side plates 4. The fastening plate 18 is fixedly connected to the side plates 4 by bolts. A rotating arm 17 is rotatably connected to the fastening plate 18. The rotating arm 17 is rotatably connected to the fastening plate 18 by a pin. The rotating arm 17 has a strip groove 9, which is vertically distributed. A toothed disc 16 that meshes with the moving plate 20 is formed on the rotating arm 17. The toothed disc 16 is fan-shaped. A bracket 15 is fixed on the side plate 4. A shaft 20 passes through the bracket 15. The shaft 20 and the bracket 15 are rotatably connected by a bearing. A bevel tooth 25 is fixed at one end of the shaft 20. A turntable 27 is installed at the other end. A moving pin 28 that passes through the strip groove 9 is formed on the turntable 27. The moving pin 28 is eccentrically positioned with the turntable 27. The moving pin 28 slides in cooperation with the strip groove 9. A bevel tooth 29 that meshes with the bevel tooth 25 is installed on the stirring shaft 6.

[0045] Working principle: During the stirring process of the sedimentation tank, the motor 13 is turned on. The output shaft of the motor 13 drives the drive shaft 8 and the moving wheel 5 to rotate. The moving wheel 5 is in contact with the upper surface wall of the sedimentation tank. The moving block 3 can drive the side plate 4 to move on the sedimentation tank. Under the action of the belt 11, the drive shaft 8 drives the shaft 10 to rotate. The half gear 26 is sleeved on the end of the shaft 10. The half gear 26 follows the shaft 10 to rotate. During the rotation, the half gear 26 meshes with the inner walls of both sides of the moving frame 24, so that the moving frame 24 reciprocates along the axial direction of the guide rod 23. The outer wall of the moving frame 24 meshes with the driven gear 14, so that the driven gear 14 drives the stirring shaft 6 and the stirring blade 7 to rotate continuously clockwise and counterclockwise, realizing the automatic stirring of the sedimentation tank.

[0046] The second conical tooth 29 is sleeved on the outside of the stirring shaft 6. The second conical tooth 29 can rotate with the stirring shaft 6. The first conical tooth 25 and the second conical tooth 29 are meshed and connected. The first conical tooth 25 can drive the second shaft 30, the turntable 27 and the moving pin 28. During the rotation, the moving pin 28 slides inside the strip groove 9, causing the rotating arm 17 to drive the toothed disc 16 to swing back and forth. The toothed disc 16 is meshed and connected with the moving plate 20. The moving plate 20 drives the paddle 19 to move back and forth. The paddle 19 moves the water, which helps to stir the liquid inside the sedimentation tank.

[0047] This device can agitate different locations in the sedimentation tank using only one motor 13. Compared with existing agitation equipment, it has a better agitation effect and is more convenient and simple to use.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A process for zero discharge of industrial wastewater based on nanocalcium carbonate production, characterized by, Includes the following steps: a. Transporting industrial wastewater produced based on nano-calcium carbonate to a sedimentation tank; b. Add polyaluminum sulfate to the sedimentation tank and stir to lower the pH of the industrial wastewater; c. Then add polyaluminum chloride to the sedimentation tank and stir to carry out adsorption and coagulation. If there are few flocs and a lot of residual turbidity in the sedimentation tank, the dosage is too small. If the flocs in the sedimentation tank are large and rise to the surface, the dosage is too large and should be adjusted appropriately. d. Next, add polyacrylamide to the sedimentation tank and stir thoroughly to flocculate and form sediment; e. Finally, the precipitate is removed by filtration, yielding the treated wastewater solution; The stirring equipment involved in steps b, c and d includes two guide rods (2) fixed to the sedimentation tank by a column (1), each of the two guide rods (2) is fitted with a moving block (3), a drive shaft (8) passes through the two moving blocks (3) and a moving wheel (5) is installed on the drive shaft (8), a motor (13) is fixed on the moving block (3), a side plate (4) is fixed on the two moving blocks (3), the side plate (4) has a through groove (12) to avoid the drive shaft (8), a stirring shaft (6) is provided between the two side plates (4) and a stirring blade (7) is fixed on the stirring shaft (6), a driven gear (14) is fixed on the stirring shaft (6), and a driving component (1) acts on the driven gear (14) to make the stirring shaft (6) rotate continuously clockwise and counterclockwise. The first driving component includes a shaft (10) that passes through the side plate (4). One end of the shaft (10) is connected to the drive shaft (8) via a belt (11), and the other end is fixed with a half gear (26). A protrusion (22) is fixed on the side plate (4). A movable frame (24) is provided between the protrusions (22), with its inner wall meshing with the half gear (26) and its outer wall meshing with the driven gear (14). A guide rod (23) passes through the movable frame (24). A movable plate (20) with an anti-detachment block (21) is passed through between the two side plates (4). The side wall of the movable plate (20) has an arc-shaped paddle (19). The side plate (4) is provided with a driving component 2 for driving the movable plate (20) to reciprocate. The second driving component includes a fastening plate (18) fixed between two side plates (4), a rotating arm (17) rotatably connected to the fastening plate (18), a strip groove (9) on the rotating arm (17), a toothed disc (16) formed on the rotating arm (17) that meshes with the moving plate (20), a bracket (15) fixed on the side plate (4), a shaft (20) passing through the bracket (15), a bevel tooth (25) fixed at one end of the shaft (20), a turntable (27) installed at the other end, a moving pin (28) formed on the turntable (27) that passes through the strip groove (9), and a bevel tooth (29) meshing with the bevel tooth (25) installed on the stirring shaft (6).

2. The nanocarbonated calcium-based industrial wastewater zero discharge treatment process according to claim 1, characterized by the fact that, The side plate (4) and the movable block (3) are fixedly connected by bolts.

3. The zero-discharge treatment process for industrial wastewater based on nano-calcium carbonate production according to claim 2, characterized in that, The movable plate (20) and the lever (19) are integrally formed.

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