A flocculation and decolorization device for papermaking wastewater

Abstract

This utility model discloses a flocculation and decolorization device for papermaking wastewater, relating to the field of papermaking equipment technology. It includes a wastewater collection tank, a flocculation tank, and a sedimentation tank. A flocculation tank is located on one side of the wastewater collection tank, and a sedimentation tank is located on the other side. A pH sensor, an acid dosing pump, and an alkali dosing pump are fixedly connected to the inner wall of one end of the wastewater collection tank, with the dosing ports extending into the tank. An inlet is provided at the input end of the flocculation tank, and a coagulation pipe is fixedly connected thereto. A PAC dosing pump, a decolorizing agent dosing pump, and a PAM dosing pump are sequentially and fixedly connected to the outer wall of one side of the coagulation pipe along the water flow direction. The wastewater collection tank uses a pH detection device to adjust the pH value of the wastewater in a timely manner. Simultaneously, the coagulation pipe and the flocculation tank work together to ensure that the chemicals react fully and sequentially, allowing the dyes or pigments in the papermaking wastewater to be completely adsorbed onto the surface of the pulp fibers and flocculated into clumps. The effluent structure of the primary sedimentation tank reduces the flow rate of the clear water after sedimentation, ensuring clear water quality.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment technology, specifically to a flocculation and decolorization device for papermaking wastewater. Background Technology

[0002] In the papermaking industry, wastewater mainly originates from the two core processes of pulping and papermaking. This type of wastewater not only contains a large amount of incompletely utilized pulp fibers, but also inorganic salts and fillers such as calcium carbonate and talc added during the production process. Its composition is complex and the pollutant content is high. In recent years, with the increasing demand for personalized packaging, decoration and other fields, the output and types of colored specialty paper have continued to increase. However, the production of this type of paper requires the input of various water-soluble or oil-soluble dyes and pigments, which leads to a significant increase in the content of coloring substances in papermaking wastewater. The color problem has become increasingly prominent. Under some conditions, the color of the wastewater can even reach more than 300 times, far exceeding the environmental protection emission requirements. Currently, the industry mostly uses conventional flocculation and sedimentation technology to treat papermaking wastewater. Although this technology can remove some suspended pollutants such as larger fiber bundles in the wastewater, conventional flocculants are unable to effectively adsorb and complex dye or pigment molecules dissolved in the wastewater, and cannot convert them into precipitable solid particles. At the same time, during the treatment process, a large number of fine fibers and impurities are difficult to be encapsulated by conventional flocs due to their small particle size and light weight, and ultimately remain suspended in the treated wastewater. Therefore, it is necessary to propose a flocculation and decolorization device for papermaking wastewater. Utility Model Content

[0003] The purpose of this invention is to provide a flocculation and decolorization device for papermaking wastewater to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a papermaking wastewater flocculation and decolorization device, comprising a wastewater collection tank, a flocculation tank, and a sedimentation tank, wherein a flocculation tank is provided on one side of the wastewater collection tank, and a sedimentation tank is provided on one side of the flocculation tank. A pH sensor, an acid dosing pump, and an alkali dosing pump are fixedly connected to the inner wall of one end of the sewage collection tank, with the dosing ports extending into the interior of the sewage collection tank. The input end of the flocculation tank has an inlet and a coagulation pipe is fixedly connected to it. A PAC dosing pump, a decolorizing agent dosing pump, and a PAM dosing pump are sequentially and fixedly connected to the outer wall of one side of the coagulation pipe along the water flow direction. A dosing port is sequentially opened on the outer wall of one side of the coagulation pipe along the water flow direction. A fixing block is fixedly connected to the middle of the sedimentation tank. A vertical chute is symmetrically opened through the upper surface of the fixing block. A water-blocking baffle is slidably connected to the inner wall of the vertical chute. Overflow channels are opened through the upper ends of both sides of the sedimentation tank.

[0005] Preferably, the outer walls of both sides of the water-blocking baffle are provided with threaded holes at equal intervals, two of which extend to the outside of the fixing block and are threaded to a screw rod, and one end of the screw rod is provided with a handle.

[0006] Preferably, a pH display is fixedly connected to one side of the outer wall of the sewage collection tank, and the pH display is electrically connected to a pH sensor, an acid dosing pump, and an alkali dosing pump.

[0007] Preferably, the inner walls at both ends of the flocculation tank are fixedly connected with partitions at equal intervals, and the partitions are arranged in an alternating pattern.

[0008] Preferably, the sedimentation tank has a hole at the center of the bottom wall and a water inlet pipe is fixedly connected thereto. One end of the water inlet pipe is fixedly connected to a fixed block, and the end of the water inlet pipe away from the fixed block extends through into the flocculation tank.

[0009] Preferably, a spiral baffle is fixedly connected inside the coagulation pipe, and multiple dosing ports are sequentially opened on one side of the outer wall of the coagulation pipe along the water flow direction and are respectively connected to the output ends of the PAC dosing pump, the decolorizing agent dosing pump and the PAM dosing pump. The end of the coagulation pipe away from the flocculation tank extends into the sewage collection tank and is fixedly connected to a sewage pump.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: wastewater is collected in a sewage collection tank, and the acidity and alkalinity of the wastewater are adjusted by acid and alkali dosing pumps. The adjusted wastewater enters the coagulation pipe and is flocculated by a dosing pump. The flocculated wastewater enters the sedimentation tank through the inlet pipe for sedimentation. The sewage collection tank adjusts the pH value of the wastewater in a timely manner through a pH detection device. At the same time, the coagulation pipe and the flocculation tank work together to allow the chemicals to react fully in sequence, so that the dyes or pigments in the papermaking wastewater are completely adsorbed onto the surface of the pulp fibers and flocculated into clumps. The effluent structure of the primary sedimentation tank can reduce the flow rate of the clear water after sedimentation, ensuring that the water quality is clear. Attached Figure Description

[0011] Figure 1 This is a front view structural diagram of the present utility model; Figure 2 This is a cross-sectional view of the sewage collection tank of this utility model; Figure 3 This is a partial cross-sectional view of the concrete pipe of this utility model; Figure 4 This is a schematic cross-sectional view of the flocculation tank of this utility model; Figure 5 This is a cross-sectional structural diagram of the sedimentation tank of this utility model; Figure 6 This is a front view structural diagram of the fixing block of this utility model.

[0012] In the diagram: 1. Wastewater collection tank; 2. Flocculation tank; 3. Sedimentation tank; 4. pH sensor; 5. Acid dosing pump; 6. Alkali dosing pump; 7. Coagulation pipe; 8. PAC dosing pump; 9. Decolorizing agent dosing pump; 10. PAM dosing pump; 11. Fixing block; 12. Water baffle; 13. Overflow trough; 14. Screw; 15. pH display; 16. Baffle; 17. Inlet pipe; 18. Wastewater pump. Detailed Implementation

[0013] Please see Figure 1-6 This utility model provides a technical solution: Example 1: A papermaking wastewater flocculation and decolorization device, including a wastewater collection tank 1, a flocculation tank 2, and a sedimentation tank 3. The flocculation tank 2 is provided on one side of the wastewater collection tank 1, and the sedimentation tank 3 is provided on one side of the flocculation tank 2. The bottom of the sedimentation tank 3 has a conical structure, which is conducive to sludge collection and is also provided with a discharge pipe. The feature is that a pH sensor 4, an acid dosing pump 5, and an alkali dosing pump 6 are fixedly connected to the inner wall of one end of the sewage collection tank 1, and the dosing ports extend into the interior of the sewage collection tank 1. The input end of the flocculation tank 2 has an inlet and a coagulation pipe 7 is fixedly connected to it. A PAC dosing pump 8, a decolorizing agent dosing pump 9, and a PAM dosing pump 10 are sequentially and fixedly connected to the outer wall of one side of the coagulation pipe 7 along the water flow direction. Dosing ports are sequentially opened on the outer wall of one side of the coagulation pipe 7 along the water flow direction. A fixing block 11 is fixedly connected to the middle of the sedimentation tank 3. Vertical chutes are symmetrically opened through the upper surface of the fixing block 11. Water-blocking baffles 12 are slidably connected to the inner wall of the vertical chutes. Overflow channels 13 are opened through the upper ends of both sides of the sedimentation tank 3. The spacing between adjacent dosing ports of coagulation pipe 7 is 2-3 times the diameter of the coagulation pipe, and the pitch of the spiral baffle fixed inside coagulation pipe 3 is 1.5 times the pipe diameter. The inlet pipe 17 extends from the center of the bottom of sedimentation tank 3 to 2 / 3 of the tank height, and outlet holes with a diameter of 5-8mm and a hole spacing of 10-15mm are evenly opened above the waist. The height of baffle 16 is 2 / 3 of the height of flocculation tank, and the spacing between adjacent baffles 16 is 1 / 4 of the length of flocculation tank 2. The pH sensor 4 is model Y532-A, the acid dosing pump 5 and the alkali dosing pump 6 are model JM-W, the PAC dosing pump 8, the decolorizing agent dosing pump 9 and the PAM dosing pump 10 are model PreP100, and the pH display 15 is model pHG-202.

[0014] During use, pH sensor 4, acid dosing pump 5, alkali dosing pump 6, PAC dosing pump 8, decolorizing agent dosing pump 9, PAM dosing pump 10, pH display and sewage pump 18 are all connected to an external drive source through the controller to transport papermaking wastewater from the production workshop pipeline to the sewage collection tank 1. At the same time, pH sensor 4 and pH display 15 are turned on to monitor the pH value of the wastewater in sewage collection tank 1 in real time. If the pH display 15 shows pH < 6.5, which is lower than the target range of 7-8, the pH display 15 will automatically trigger the alkaline solution dosing pump 6 to start, pouring 30% sodium hydroxide solution into the sewage collection tank 1 until the wastewater pH stabilizes at 7-8. If pH > 8.5, which is higher than the upper limit of the target range, the acid dosing pump 5 will be automatically triggered to pour 10% hydrochloric acid solution into the sewage collection tank 1 until the wastewater pH stabilizes at 7-8, ensuring pH uniformity. The pH-adjusted wastewater is pumped to the coagulation pipe 7 by sewage pump 18, while the dosing pumps are started in the following sequence: When wastewater enters the first section of the coagulation pipe, the PAC dosing pump 8 starts and adds 10% PAC solution into the coagulation pipe 7. Under the action of the spiral baffle, the PAC solution and wastewater are fully mixed to form primary micro flocs. When the wastewater flows to the middle section of the coagulation pipe, the decolorizing agent dosing pump 9 starts and adds 8% decolorizing agent solution into the coagulation pipe 7. The decolorizing agent adsorbs the dye molecules in the wastewater and attaches to the surface of the primary flocs. When the wastewater flows to the end of the coagulation pipe, the PAM dosing pump 10 starts and adds 0.1% PAM solution into the coagulation pipe 7. PAM aggregates the primary flocs that adsorb the dye into large-particle flocs through bridging. The wastewater carrying the large-particle flocs flows from the end of the coagulation pipe 7 into the flocculation tank 2. After being mixed by the staggered baffle 16, the flocs grow and stabilize further. After staying for a period of time, they flow from the bottom of the flocculation tank 2 into the inlet pipe 17. Wastewater containing stable flocs enters the sedimentation tank 3 through the inlet pipe 17 and diffuses evenly into the sedimentation tank 3 through the outlet hole at the waist of the inlet pipe 17. At this time, the height of the baffle plate 12 is adjusted according to the wastewater concentration. When the wastewater has a high concentration of large particles and flocs, rotate the screw 14 handle clockwise to turn the screw 14 out of the screw hole and move the baffle 12 upward to a distance of 0.5m from the outlet of the inlet pipe 17 to increase the vertical spacing, reserve sufficient diffusion space, and avoid floc accumulation. When the wastewater concentration is low and there are many small flocs, move the baffle plate downwards to 0.2m away from the outlet of the inlet pipe 17 to reduce the vertical spacing, slow down the water flow speed, and prolong the sedimentation time of small particles. After adjustment, rotate screw 14 counterclockwise to rotate screw 14 into screw hole, fix water baffle 12 and fixing block 11. Wastewater stays in sedimentation tank for a period of time, flocs naturally settle to the bottom of the tank and are discharged, and clarified water flows out from overflow troughs 13 on both sides.

[0015] Example 2: This example differs from Example 1 in its technical solution; Both sides of the water-blocking baffle 12 have equally spaced threaded holes, two of which extend to the outside of the fixing block 11 and are threaded with screws 14. One end of the screw 14 has a handle. The screws 14 are used to fix the water-blocking baffle 12 to the fixing block 11. A pH display 15 is fixedly connected to one side of the outer wall of the sewage collection tank 1. The pH display 15 is electrically connected to the pH sensor 4, the acid dosing pump 5, and the alkali dosing pump 6. The pH display 3 shows the pH value of the papermaking wastewater in the sewage collection tank 1. Acid or alkali is added according to the data displayed by the pH display 3 to control the pH value of the papermaking wastewater in the sewage collection tank 1 to be maintained at 7-8. Both the upper and lower inner walls of the flocculation tank 2 are fixedly connected with baffles 16 at equal intervals. The components are arranged in an alternating pattern to ensure that the wastewater and chemicals are fully mixed after dosing. A hole is opened in the center of the bottom wall of the sedimentation tank 3 and an inlet pipe 17 is fixedly connected thereto. One end of the inlet pipe 17 is fixedly connected to the fixing block 11. The end of the inlet pipe 17 away from the fixing block 11 extends through the flocculation tank 2 to facilitate the flow of papermaking wastewater into the sedimentation tank 3. A spiral baffle is fixedly connected inside the coagulation pipe 7. Multiple dosing ports are opened in sequence along the water flow direction on one side of the outer wall of the coagulation pipe 7 and are respectively connected to the output ends of the PAC dosing pump 8, the decolorizing agent dosing pump 9 and the PAM dosing pump 10. The end of the coagulation pipe 7 away from the flocculation tank 2 extends through the sewage collection tank 1 and is fixedly connected to the sewage pump 18. The sewage pump 18 is used to pour wastewater into the coagulation pipe 7.

Claims

1. A papermaking wastewater flocculation and decolorization device, comprising a wastewater collection tank (1), a flocculation tank (2), and a sedimentation tank (3), wherein the wastewater collection tank (1) is provided with the flocculation tank (2) on one side and the flocculation tank (2) is provided with the sedimentation tank (3) on one side. Its features are, A pH sensor (4), an acid dosing pump (5), and an alkali dosing pump (6) are fixedly connected to the inner wall of one end of the sewage collection tank (1), and the dosing port extends into the sewage collection tank (1). The input end of the flocculation tank (2) is provided with a feed inlet and a coagulation pipe (7) is fixedly connected. A PAC dosing pump (8), a decolorizing agent dosing pump (9), and a PAM dosing pump (10) are sequentially fixedly connected to the outer wall of one side of the coagulation pipe (7) along the water flow direction. A dosing port is sequentially opened on the outer wall of one side of the coagulation pipe (7) along the water flow direction. A fixing block (11) is fixedly connected to the middle position of the sedimentation tank (3). A vertical sliding groove is symmetrically opened through the upper surface of the fixing block (11). A water baffle (12) is slidably connected to the inner wall of the vertical sliding groove. An overflow groove (13) is opened through the upper ends of both sides of the sedimentation tank (3).

2. The flocculation and decolorization device for papermaking wastewater according to claim 1, characterized in that: The outer walls of both sides of the water-blocking baffle (12) are provided with threaded holes at equal intervals. Two of the threaded holes extend to the outside of the fixing block (11) and are threaded to a screw rod (14). One end of the screw rod (14) is provided with a handle.

3. The flocculation and decolorization device for papermaking wastewater according to claim 1, characterized in that: A pH display (15) is fixedly connected to one side of the outer wall of the sewage collection tank (1). The pH display (15) is electrically connected to the pH sensor (4), the acid dosing pump (5), and the alkali dosing pump (6).

4. The flocculation and decolorization device for papermaking wastewater according to claim 1, characterized in that: The flocculation tank (2) has partitions (16) fixedly connected at equal intervals on the inner walls of both the upper and lower ends, and the partitions (16) are arranged in an alternating pattern.

5. The flocculation and decolorization device for papermaking wastewater according to claim 1, characterized in that: The sedimentation tank (3) has a hole at the center of the bottom wall and a water inlet pipe (17) is fixedly connected to it. One end of the water inlet pipe (17) is fixedly connected to the fixed block (11), and the end of the water inlet pipe (17) away from the fixed block (11) extends through into the flocculation tank (2).

6. The flocculation and decolorization device for papermaking wastewater according to claim 1, characterized in that: The coagulation pipe (7) is fixedly connected to a spiral baffle. Multiple dosing ports are opened sequentially on one side of the outer wall of the coagulation pipe (7) along the water flow direction and are respectively connected to the output ends of the PAC dosing pump (8), the decolorizing agent dosing pump (9) and the PAM dosing pump (10). The end of the coagulation pipe (7) away from the flocculation tank (2) extends into the sewage collection tank (1) and is fixedly connected to a sewage pump (18).

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