Anti-scaling electrodialyzer with pretreatment function

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses an anti-scaling electrodialyzer with a pretreatment function, which comprises an electrodialyzer body, a water inlet pipe is fixedly connected to the side wall of the electrodialyzer body, and a water outlet pipe is fixedly connected to the side wall of the electrodialyzer body. The end, away from the electrodialyzer body, of the water inlet pipe is fixedly connected with a box body, and a pretreatment device is arranged in the box body. According to the anti-scaling electrodialyzer with the pretreatment function, calcium carbonate and magnesium hydroxide precipitates are formed by lime and calcium and magnesium ions, the scaling phenomenon caused by combination of the calcium and magnesium ions and multivalent anions such as carbonate or sulfate radicals in the electrodialyzer body is reduced, the service life of a membrane is prolonged, and the cleaning frequency is reduced; the monovalent ions can be separated more efficiently by the electrodialyzer body, the operation efficiency is improved, and the push plate pushes calcium carbonate and magnesium hydroxide precipitates to move towards the drainage pipe, so that secondary pollution is avoided.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an anti-scaling electrodialysis device with pretreatment function. Background Technology

[0002] Electrodialysis offers advantages such as high concentration ratio, low operating pressure, and high recovery rate when treating saline wastewater. However, many saline wastewaters, such as desulfurization wastewater, reverse osmosis concentrate, and circulating cooling tower effluent, contain various ions. Among these, calcium and magnesium ions readily combine with sulfate, phosphate, and carbonate ions to form precipitates, easily causing scaling in the electrodialysis equipment.

[0003] According to a published electrodialysis device (publication number: CN108911059A), the above application includes an anode plate, a membrane stack, a cathode plate, and a clamping plate for fixing and sealing the membrane stack; the membrane stack includes a monovalent selective anion exchange membrane that selectively permeates monovalent anions, a cation exchange membrane that permeates monovalent cations and polyvalent cations, and a separator.

[0004] However, in actual use, calcium and magnesium ions in the above-mentioned electrodialysis equipment tend to form insoluble salts with sulfate and carbonate ions before passing through the cation exchange membrane. These scale-forming substances not only clog the surface of the electrodialysis membrane but may also block the flow channels, reducing the ion permeability of the membrane and decreasing the efficiency of electrodialysis. This necessitates frequent membrane replacement or cleaning of the membrane surface. In view of this, we propose an anti-scaling electrodialysis equipment with pretreatment function. Utility Model Content

[0005] The purpose of this invention is to provide an anti-scaling electrodialysis device with pretreatment function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an anti-scaling electrodialysis device with pretreatment function, comprising an electrodialysis device body, an inlet pipe fixedly connected to the side wall of the electrodialysis device body, a housing fixedly connected to the end of the inlet pipe away from the electrodialysis device body, and a pretreatment device disposed inside the housing, the pretreatment device comprising:

[0007] A flow guide plate is fixedly connected to the inner wall of the housing. A flow-slowing strip is fixedly connected to the top end face of the flow guide plate, and an atomizing nozzle is fixedly connected to the inner bottom surface of the housing.

[0008] The motor is fixedly connected to the top end face of the housing, and the output end of the motor is fixedly connected to a rotating shaft, and the side wall of the rotating shaft is fixedly connected to an auger.

[0009] Vertical plate one, vertical plate two, vertical plate three are fixedly connected to the inner wall of the box, vertical plate three has an opening on its side wall, vertical plate three has an inclined plate fixedly connected to its bottom, and vertical plate three has a filter plate fixedly connected to its side wall.

[0010] A trapezoidal plate is fixedly connected to the inner wall of the box.

[0011] Preferably, the side wall of the box is fixedly connected to a wastewater pipe and a drain pipe, the inlet pipe is located between the guide plate and the filter plate, the wastewater pipe is located above the guide plate, and the drain pipe is close to the bottom of the box.

[0012] Preferably, the first vertical plate and the third vertical plate are fixedly connected to the bottom of the guide plate, there is a gap between the first vertical plate and the trapezoidal plate, there is a gap between the top of the second vertical plate and the guide plate, and there is a gap between the bottom of the second vertical plate and the bottom of the box. By setting the first vertical plate, the second vertical plate and the third vertical plate, the influence of the auger rotation on the water near the inlet pipe of the third vertical plate is reduced, so that calcium carbonate and magnesium hydroxide in the water can be precipitated.

[0013] Preferably, an electric push rod is fixedly connected to the inner bottom surface of the box, a push plate is fixedly connected to the output end of the electric push rod, a horizontal plate is fixedly connected to the top of the push plate, and the horizontal plate is movably connected to the bottom end face of the trapezoidal plate.

[0014] Preferably, the atomizing nozzle is fixedly connected to the liquid inlet pipe, and the atomizing nozzle is located on the top end face of the guide plate. The atomizing nozzle sprays lime water, causing lime to react with calcium and magnesium ions to form calcium carbonate and magnesium hydroxide precipitates.

[0015] Preferably, the flow-slowing strips are arranged in an arc shape, and there are several groups of flow-slowing strips. The groups of flow-slowing strips are evenly spaced on the top end face of the guide plate. The flow-slowing strips guide the wastewater to flow to both sides, so that the wastewater does not accumulate in one place and flow downward.

[0016] Compared with the prior art, this utility model provides an anti-scaling electrodialysis device with pretreatment function, which has the following beneficial effects:

[0017] 1. This anti-scaling electrodialysis unit with pretreatment function, through the design of guide plates, atomizing nozzles, and an auger, causes lime to react with calcium and magnesium ions to form calcium carbonate and magnesium hydroxide precipitates. This reduces scaling caused by the combination of calcium and magnesium ions with polyvalent anions, such as carbonate or sulfate, in the electrodialysis unit, extending membrane lifespan, reducing cleaning frequency, and enabling the electrodialysis unit to more efficiently separate these monovalent ions, improving operating efficiency and reducing energy consumption. By setting up vertical plates one, two, and three, the influence of the auger rotation on the water near the inlet pipe side of vertical plate three is reduced, allowing calcium carbonate and magnesium hydroxide in the water to precipitate, making the supernatant of the wastewater flowing into the electrodialysis unit cleaner and reducing the fouling burden on the membrane.

[0018] 2. This anti-scaling electrodialysis device with pretreatment function uses a pusher plate to further push calcium carbonate and magnesium hydroxide precipitates towards the drain pipe. The drain pipe periodically draws away the calcium carbonate and magnesium hydroxide precipitates at the bottom and discharges them in a directional manner, ensuring a lower content of suspended particles in the water, thereby further improving water clarity and avoiding secondary pollution. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the box body of this utility model;

[0021] Figure 3 This is a schematic diagram of the guide plate structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the push plate structure of this utility model.

[0023] In the diagram: 1. Electrodialysis unit body; 2. Inlet pipe; 3. Housing; 4. Wastewater pipe; 5. Drain pipe; 6. Pretreatment device; 601. Guide plate; 602. Flow-slowing strip; 603. Atomizing nozzle; 604. Motor; 605. Rotating shaft; 606. Screw auger; 607. Vertical plate one; 608. Vertical plate two; 609. Vertical plate three; 610. Filter plate; 611. Trapezoidal plate; 612. Inclined plate; 7. Electric push rod; 8. Push plate; 9. Horizontal plate; 10. Inlet pipe. Detailed Implementation

[0024] like Figures 1-4As shown, this utility model provides a technical solution: an anti-scaling electrodialysis device with pretreatment function, including an electrodialysis device body 1, an inlet pipe 2 fixedly connected to the side wall of the electrodialysis device body 1, a housing 3 fixedly connected to the end of the inlet pipe 2 away from the electrodialysis device body 1, a pretreatment device 6 provided inside the housing 3, the pretreatment device 6 including a guide plate 601, a flow-slowing strip 602, an atomizing nozzle 603, a motor 604, a rotating shaft 605, an auger 606, a first vertical plate 607, a second vertical plate 608, a third vertical plate 609, a filter plate 610, a trapezoidal plate 611, and an inclined plate 612.

[0025] In one embodiment of this utility model, a guide plate 601 is fixedly connected to the inner wall of the box 3. A flow-slowing strip 602 is fixedly connected to the top end face of the guide plate 601. The flow-slowing strip 602 is arc-shaped and there are several groups of flow-slowing strips 602. The groups of flow-slowing strips 602 are evenly spaced on the top end face of the guide plate 601. The flow-slowing strip 602 guides the wastewater to flow to both sides, so that the wastewater does not accumulate in one place and flow downward. An atomizing nozzle 603 is fixedly connected to the bottom surface of the inside of the box 3. The atomizing nozzle 603 is fixedly connected to the liquid inlet pipe 10. The atomizing nozzle 603 is located on the top end face of the guide plate 601. The atomizing nozzle 603 sprays lime water, so that lime and calcium and magnesium ions form calcium carbonate and magnesium hydroxide precipitates. A motor 604 is fixedly connected to the top end face of the box 3. A rotating shaft 605 is fixedly connected to the output end of the motor 604. An auger 606 is fixedly connected to the side wall of the rotating shaft 605.

[0026] Vertical plate 607 is fixedly connected to the inner wall of the box 3. Vertical plate 608 and vertical plate 609 are also fixedly connected to the inner wall of the box 3. The side wall of vertical plate 609 has an opening. An inclined plate 612 is fixedly connected to the bottom of vertical plate 609. A filter plate 610 is fixedly connected to the side wall of vertical plate 609. Vertical plate 607, vertical plate 609 and the bottom of guide plate 601 are fixedly connected. There is a gap between vertical plate 607 and trapezoidal plate 611. There is a gap between the top of vertical plate 608 and guide plate 601. There is a gap between the bottom of vertical plate 608 and vertical plate 609 and the bottom of the inner bottom surface of the box 3. By setting vertical plate 607, vertical plate 608 and vertical plate 609, the influence of the rotation of auger 606 on the water near the inlet pipe 2 of vertical plate 609 is reduced, so that calcium carbonate and magnesium hydroxide in the water can be precipitated.

[0027] The trapezoidal plate 611 is fixedly connected to the inner wall of the box 3. The side wall of the box 3 is fixedly connected to the wastewater pipe 4 and the drain pipe 5. The inlet pipe 2 is located between the guide plate 601 and the filter plate 610. The wastewater pipe 4 is located above the guide plate 601. The drain pipe 5 is close to the bottom of the box 3.

[0028] Wastewater enters the tank 3 through wastewater pipe 4 and is discharged onto guide plate 601. Then, atomizing nozzle 603 sprays lime water onto the wastewater. Lime reacts with calcium and magnesium ions to form calcium carbonate and magnesium hydroxide precipitates. The wastewater then flows to screw conveyor 606, which further promotes the reaction between lime and calcium and magnesium ions.

[0029] Then, the water carrying calcium carbonate and magnesium hydroxide precipitates in tank 3. The calcium carbonate and magnesium hydroxide precipitates slowly sink to the inner wall of tank 3. The clean water then enters the electrodialysis unit 1 through filter plate 610 and inlet pipe 2 for further treatment. This significantly reduces scaling caused by the combination of calcium and magnesium ions with polyvalent anions, such as carbonate or sulfate, in the electrodialysis unit 1, extends the membrane's lifespan, reduces the cleaning frequency, and enables the electrodialysis unit 1 to separate these monovalent ions more efficiently, improving operating efficiency and reducing energy consumption.

[0030] By setting up vertical plates 607, 608, and 609, the influence of the auger 606 rotation on the water near the inlet pipe 2 of vertical plate 609 is reduced, allowing calcium carbonate and magnesium hydroxide in the water to precipitate, making the supernatant of the wastewater flowing into the electrodialysis unit 1 cleaner, reducing the fouling burden on the membrane, and preventing precipitates from accumulating in a certain area and clogging pipes or equipment.

[0031] In addition, an electric push rod 7 is fixedly connected to the bottom surface of the inner chamber 3. A push plate 8 is fixedly connected to the output end of the electric push rod 7. A horizontal plate 9 is fixedly connected to the top of the push plate 8. The horizontal plate 9 is movably connected to the bottom end face of the trapezoidal plate 611. The electric push rod 7 pushes the push plate 8 towards the drain pipe 5. The push plate 8 further pushes the calcium carbonate and magnesium hydroxide precipitates towards the drain pipe 5. The drain pipe 5 periodically sucks away the calcium carbonate and magnesium hydroxide precipitates at the bottom and discharges the precipitates in a directional manner, ensuring that the suspended particulate content in the water is lower, thereby further improving the water clarity, avoiding secondary pollution, and improving the overall water quality assurance capability of the treatment system.

[0032] In this invention, during use, wastewater is discharged onto the guide plate 601, and the atomizing nozzle 603 sprays lime water onto the wastewater. The auger 606 further promotes the reaction between lime and calcium and magnesium ions, forming calcium carbonate and magnesium hydroxide. The calcium carbonate and magnesium hydroxide slowly sink into the inner wall of the tank 3, while the clean water enters the electrodialysis unit 1 for further treatment through the filter plate 610 and the inlet pipe 2.

[0033] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. An anti-scaling electrodialysis device with pretreatment function, comprising an electrodialysis device body (1), wherein a water inlet pipe (2) is fixedly connected to the side wall of the electrodialysis device body (1), characterized in that: The end of the inlet pipe (2) away from the electrodialysis unit body (1) is fixedly connected to a housing (3). A pretreatment device (6) is installed inside the housing (3). The pretreatment device (6) includes: A flow guide plate (601) is fixedly connected to the inner wall of the box (3). A flow slowing strip (602) is fixedly connected to the top end face of the flow guide plate (601). An atomizing nozzle (603) is fixedly connected to the bottom surface of the box (3). Motor (604), the motor (604) is fixedly connected to the top end face of the housing (3), the output end of the motor (604) is fixedly connected to a rotating shaft (605), and the side wall of the rotating shaft (605) is fixedly connected to an auger (606); Vertical plate one (607) is fixedly connected to the inner wall of the box (3), vertical plate two (608) is fixedly connected to the inner wall of the box (3), vertical plate three (609) is fixedly connected to the inner wall of the box (3), the side wall of vertical plate three (609) is provided with an opening, the bottom of vertical plate three (609) is fixedly connected with an inclined plate (612), and the side wall of vertical plate three (609) is fixedly connected with a filter plate (610). A trapezoidal plate (611) is fixedly connected to the inner wall of the box (3).

2. The anti-scaling electrodialysis device with pretreatment function according to claim 1, characterized in that: Wastewater pipe (4) and drain pipe (5) are fixedly connected to the side wall of the box (3). The inlet pipe (2) is located between the guide plate (601) and the filter plate (610). The wastewater pipe (4) is located above the guide plate (601). The drain pipe (5) is close to the bottom of the box (3).

3. The anti-scaling electrodialysis device with pretreatment function according to claim 1, characterized in that: The first vertical plate (607) and the third vertical plate (609) are fixedly connected to the bottom of the guide plate (601). There is a gap between the first vertical plate (607) and the trapezoidal plate (611). There is a gap between the top of the second vertical plate (608) and the guide plate (601). There is a gap between the bottom of the second vertical plate (608) and the third vertical plate (609) and the inner bottom surface of the box (3).

4. The anti-scaling electrodialysis device with pretreatment function according to claim 1, characterized in that: An electric push rod (7) is fixedly connected to the bottom surface of the inner side of the box (3). A push plate (8) is fixedly connected to the output end of the electric push rod (7). A horizontal plate (9) is fixedly connected to the top of the push plate (8). The horizontal plate (9) is movably connected to the bottom end face of the trapezoidal plate (611).

5. The anti-scaling electrodialysis device with pretreatment function according to claim 1, characterized in that: The atomizing nozzle (603) is fixedly connected to the liquid inlet pipe (10), and the atomizing nozzle (603) is located on the top end face of the guide plate (601).

6. The anti-scaling electrodialysis device with pretreatment function according to claim 1, characterized in that: The flow-slowing strip (602) is arranged in an arc shape, and the number of flow-slowing strips (602) is arranged in several groups, and the several groups of flow-slowing strips (602) are arranged at equal intervals on the top end face of the guide plate (601).

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