Descaling device and method for reverse osmosis concentrated water treatment system

Abstract

The invention relates to a reverse osmosis concentrated water treatment system descaling device and method, and belongs to the technical field of sewage treatment equipment descaling, the reverse osmosis concentrated water treatment system descaling device comprises a neutralization tank, a concentrated water softening tank, a concentrated water coagulating tank, a concentrated water softening sedimentation tank, a PH back-adjusting tank and a clean water tank which are arranged in sequence, and the concentrated water softening sedimentation tank is communicated with a sludge pump through a pump pipe; and the sludge pump is communicated with the neutralization tank through a pump pipe. The method has the effects of reducing the descaling cost and avoiding secondary pollution.

Description

Technical Field

[0001] This application relates to the field of descaling in wastewater treatment equipment, and in particular to a descaling device and method for a reverse osmosis concentrate treatment system. Background Technology

[0002] In the process of reverse osmosis concentrate reuse treatment, the pH value is often adjusted and sodium carbonate is added to cause calcium ions in the water to form calcium carbonate precipitate in order to remove hardness. However, after long-term operation, calcium carbonate tends to deposit in pipes and tank walls, resulting in limited water output and affecting system efficiency.

[0003] Traditional cleaning methods often use specialized chemical agents to remove calcium carbonate, which is costly and may introduce secondary pollution. Summary of the Invention

[0004] To reduce descaling costs and avoid secondary pollution, this application provides a descaling device and method for a reverse osmosis concentrate treatment system.

[0005] The descaling device and method for a reverse osmosis concentrate treatment system provided in this application adopts the following technical solution: A descaling device for a reverse osmosis concentrate treatment system includes a neutralization tank, a concentrate softening tank, a concentrate coagulation tank, a concentrate softening sedimentation tank, a pH adjustment tank, and a clear water tank arranged in sequence. The concentrate softening sedimentation tank is connected to a sludge pump through a pump pipe, and the sludge pump is also connected to the neutralization tank through a pump pipe.

[0006] By adopting the above technical solution, during the descaling of the system, acidic wastewater from the acid rolling mill is introduced into the neutralization tank, and the pH value is adjusted to between 4 and 5. Subsequently, it passes through the concentrated water softening tank, the concentrated water coagulation tank, and the concentrated water softening sedimentation tank in sequence. In the concentrated water softening sedimentation tank, it is pumped back into the neutralization tank, thus circulating the system. This process removes calcium carbonate from the system through acidic wastewater. By using industrial acidic wastewater as the cleaning medium, waste resource utilization is achieved, cleaning costs are reduced, and the cleaning process forms an internal circulation, enhancing the cleaning effect and reducing wastewater discharge. At the same time, no additional chemical cleaning agents are required, reducing the risk of secondary pollution.

[0007] Optionally, the concentrated water coagulation tank is provided with a stirring assembly, which includes a support plate disposed on the concentrated water coagulation tank, a drive motor disposed on the support plate, and the output shaft of the drive motor passing through the support plate and having an agitator disposed thereon.

[0008] By adopting the above technical solution, the drive motor drives the agitator to rotate, thereby promoting the flow of acidic waste liquid in the concentrated water coagulation tank. More acidic substances can come into contact with the sodium carbonate on the inner wall of the concentrated water coagulation tank and carry away the dissolved residue, thereby improving the descaling efficiency.

[0009] Optionally, the agitator includes an inner ring disposed on the output shaft, and a middle ring and an outer ring coaxially disposed on the outer side of the inner ring. A plurality of evenly distributed inner stirring blades are disposed between the middle ring and the inner ring, and a plurality of evenly distributed outer stirring blades are disposed between the outer ring and the middle ring.

[0010] By adopting the above technical solution, when the output shaft rotates, the inner ring, inner stirring blades, middle ring, outer stirring blades and outer ring rotate simultaneously, thereby agitating the acidic wastewater in the concentrated coagulation tank.

[0011] Optionally, the inner and outer stirring blades are tilted in opposite directions.

[0012] By adopting the above technical solution, the internal and external stirring blades are in opposite directions. When the output shaft rotates in one direction, the internal and external stirring blades drive the water flow in the same direction, thereby causing the acidic wastewater in the concentrated coagulation tank to circulate in a small loop, accelerating the descaling efficiency of the concentrated coagulation tank. In addition, in the concentrated water treatment system, the stirring method in the concentrated coagulation tank can accelerate the mixing efficiency of the flocculant added in the concentrated water and improve the flocculation effect.

[0013] Optionally, each end of the inner stirring blade is provided with a rotating rod, which is rotatably connected to the inner ring and the middle ring. The inner ring is slidably connected with a driving block corresponding to each rotating rod. The driving block is threadedly connected to the rotating rod through ball bearings. A return spring is also provided between the driving block and the inner ring to connect the two. The outer stirring blade is connected to the middle ring and the outer ring through the same structure as the inner stirring blade.

[0014] By adopting the above technical solution, when the output shaft rotates, the drive block moves under the action of centrifugal force, thereby driving the rotating rod to rotate, and further driving the inner and outer stirring blades to rotate, so that the inner and outer stirring blades remain in an inclined state when rotating. When the output shaft stops rotating, the return spring pulls the drive block back to its original position, and the rotating rod rotates in the opposite direction, so that the inner and outer stirring blades remain in a vertical state, thereby reducing the impurities adhering to the inner and outer stirring blades.

[0015] Optionally, the concentrated water softening sedimentation tank is provided with a descaling auxiliary mechanism. The descaling auxiliary mechanism includes a movable rod disposed at the bottom of the concentrated water softening sedimentation tank. The movable rod is slidably connected to the concentrated water softening sedimentation tank. A drive assembly for driving the movable rod is disposed inside the concentrated water softening sedimentation tank. A brush is disposed on the movable rod. A connecting rod parallel to the movable rod and inserted into the movable rod is disposed at the upper end of the brush. A sliding sleeve is disposed on the movable rod and is slidably connected. A torsion spring is disposed between the sliding sleeve and the movable rod.

[0016] By adopting the above technical solution, when acidic wastewater is descaled inside the concentrated water softening sedimentation tank, the drive component drives the moving rod to move, and the moving rod drives the brush bristles to move, so that the brush brushes along the surface of the dirt, thereby accelerating the dissolution rate of the dirt. The brush can rotate relative to the moving rod through the connecting rod. In addition, the sliding sleeve and torsion spring can make the brush apply pressure to the dirt, which facilitates brushing away the dirt residue and increases the contact area between the dirt and the acidic wastewater.

[0017] Optionally, the bottom of the concentrated water softening sedimentation tank is provided with troughs on both sides, the moving rod is slidably connected in the trough, the driving assembly includes a lead screw rotatably connected in the trough, the bottom of the trough is set to be wavy, both ends of the connecting rod extend out of the moving rod, one end of the connecting rod abuts against a protrusion on the bottom of one trough, and the other end abuts against a recess on the bottom of another trough.

[0018] By adopting the above technical solution, when the moving rod moves along the slide groove, the connecting rod moves along the bottom of the slide groove, causing the connecting rod to swing back and forth, thereby driving the brush to swing back and forth, thus improving the cleaning efficiency of the brush.

[0019] A descaling method for a descaling device in a reverse osmosis concentrate treatment system, characterized by comprising the following steps: S100, lower the liquid level in the treatment system and stop the reverse osmosis concentrate treatment process; S200 introduces acidic wastewater from the acid rolling mill into the neutralization tank, turns on the sludge pump of the concentrated water softening sedimentation tank, connects it to the neutralization tank, and establishes internal circulation within the system. S300 controls the amount of acidic wastewater added through online pH monitoring, maintaining the pH in the system between 4 and 5, and using the acidic wastewater to dissolve calcium carbonate precipitate. After cleaning S400, stop introducing acidic wastewater, discharge wastewater containing dissolved calcium salts to the subsequent treatment unit, and restore the system to normal operation.

[0020] Optionally, in step S300, the descaling auxiliary mechanism drives the brush to move, and the brush cleans the calcium carbonate at the bottom of the concentrated water softening sedimentation tank.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. By using industrial acidic wastewater as a cleaning medium, waste resources are utilized, cleaning costs are reduced, the cleaning process forms an internal circulation, the cleaning effect is enhanced, the amount of wastewater discharged is reduced, and no additional chemical cleaning agents are required, thus reducing the risk of secondary pollution. 2. The internal and external agitator blades are in opposite directions, thus driving the water flow in different directions. This causes the acidic wastewater in the concentrated coagulation tank to circulate in a small loop, accelerating the descaling efficiency of the concentrated coagulation tank. In addition, in the concentrated water treatment system, the agitation method in the concentrated coagulation tank can accelerate the mixing efficiency of the flocculant added to the concentrated water, improving the flocculation effect. 3. When acidic wastewater is descaled inside the concentrated water softening sedimentation tank, the drive component drives the moving rod to move, and the moving rod drives the brush bristles to move, so that the brush brushes along the surface of the dirt, thereby accelerating the dissolution rate of the dirt. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure of the stirring assembly according to an embodiment of this application.

[0024] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0025] Figure 4 This is a schematic diagram of the descaling auxiliary mechanism according to an embodiment of this application.

[0026] Figure 5 yes Figure 4 Enlarged schematic diagram of section B.

[0027] Explanation of reference numerals in the attached diagram: 1. Neutralization tank; 11. Concentrate softening tank; 2. Concentrate coagulation tank; 3. Concentrate softening sedimentation tank; 31. Slide chute; 4. pH adjustment tank; 5. Clear water tank; 6. Sludge pump; 7. Agitator assembly; 71. Drive motor; 72. Inner ring; 73. Middle ring; 74. Outer ring; 75. Inner agitator blade; 76. Outer agitator blade; 77. Rotating rod; 78. Drive block; 79. Return spring; 8. Descaling auxiliary mechanism; 81. Moving rod; 82. Brush; 83. Connecting rod; 84. Sliding sleeve; 85. Torsion spring. Detailed Implementation

[0028] The present application will be further described in detail below with reference to the accompanying drawings.

[0029] This application discloses a descaling device and method for a reverse osmosis concentrate treatment system.

[0030] Reference Figure 1A descaling device for a reverse osmosis concentrate treatment system includes a neutralization tank 1, a concentrate softening tank 11, a concentrate coagulation tank 2, a concentrate softening sedimentation tank 3, a pH adjustment tank 4, and a clear water tank 5 arranged sequentially. A pump pipe is installed at the bottom of the concentrate softening sedimentation tank 3, and the concentrate softening sedimentation tank 3 is connected to a sludge pump 6 through the pump pipe. The sludge pump 6 is also connected to the neutralization tank 1 through the pump pipe.

[0031] During system descaling, acidic wastewater from the acid rolling mill is introduced into neutralization tank 1, and the pH value is adjusted to between 4 and 5. Subsequently, it passes through concentrated water softening tank 11, concentrated water coagulation tank 2, and concentrated water softening sedimentation tank 3 in sequence. In concentrated water softening sedimentation tank 3, it re-enters neutralization tank 1 via sludge pump 6, thus circulating the process. This process removes calcium carbonate from the system through acidic wastewater. By using industrial acidic wastewater as the cleaning medium, the cleaning process forms an internal circulation, enhancing the cleaning effect, reducing wastewater discharge, and achieving descaling without the need for additional chemical cleaning agents.

[0032] Reference Figure 1 and Figure 2 The concentrated water coagulation tank 2 is equipped with a stirring assembly 7. The stirring assembly 7 includes a support plate installed on the concentrated water coagulation tank 2. A vertically arranged drive motor 71 is installed on the support plate. The output shaft of the drive motor 71 passes through the support plate and extends into the concentrated water coagulation tank 2. An agitator is provided at one end of the output shaft located inside the concentrated water coagulation tank 2.

[0033] The drive motor 71 drives the agitator to rotate, thereby promoting the flow of acidic waste liquid in the concentrated water coagulation tank 2. More acidic substances can come into contact with the sodium carbonate on the inner wall of the concentrated water coagulation tank 2 and carry away the dissolved residue, thereby improving the descaling efficiency.

[0034] Reference Figure 2 and Figure 3 The agitator includes an inner ring 72 fixed on the output shaft. A middle ring 73 and an outer ring 74, which are coaxial, are arranged sequentially on the outer side of the inner ring 72. A plurality of evenly distributed inner stirring blades 75 are arranged between the middle ring 73 and the inner ring 72. A plurality of evenly distributed outer stirring blades 76 are arranged between the outer ring 74 and the middle ring 73. The inner stirring blades 75 and the outer stirring blades 76 are inclined and in opposite directions.

[0035] When the output shaft rotates, the inner ring 72, inner stirring blade 75, middle ring 73, outer stirring blade 76 and outer ring 74 rotate simultaneously. The inner stirring blade 75 and outer stirring blade 76 rotate in opposite directions. When the output shaft rotates in one direction, the inner stirring blade 75 and outer stirring blade 76 drive the water flow in the direction of the flow, thereby causing the acidic wastewater in the concentrated coagulation tank 2 to circulate in a small loop, accelerating the descaling efficiency of the concentrated coagulation tank 2.

[0036] The inner stirring blade 75 has a rotating rod 77 fixed at both ends, and is rotatably connected to the inner ring 72 and the middle ring 73 through the rotating rod 77. The inner ring 72 has a drive block 78 that corresponds to the rotating rod 77. The drive block 78 is threadedly connected to the rotating rod 77 through ball bearings. A return spring 79 is also provided between the drive block 78 and the inner ring 72 to connect the two. The outer stirring blade 76 is connected to the middle ring 73 and the outer ring 74 through the same structure as the inner stirring blade 75.

[0037] When the output shaft rotates, the drive block 78 moves under the action of centrifugal force, thereby driving the rotating rod 77 to rotate, and further driving the inner stirring blade 75 and the outer stirring blade 76 to rotate, so that the inner stirring blade 75 and the outer stirring blade 76 remain in an inclined state when rotating. When the output shaft stops rotating, the return spring 79 pulls the drive block 78 back to its original position, and the rotating rod 77 rotates in the opposite direction, so that the inner stirring blade 75 and the outer stirring blade 76 remain in a vertical state, thereby reducing the impurities adhering to the inner stirring blade 75 and the outer stirring blade 76.

[0038] Reference Figure 1 , Figure 4 and Figure 5 The concentrated water softening sedimentation tank 3 is equipped with a descaling auxiliary mechanism 8. Sliding grooves 31 are provided on both sides of the bottom of the concentrated water softening sedimentation tank 3. The descaling auxiliary mechanism 8 includes a movable rod 81 set at the bottom of the concentrated water softening sedimentation tank 3. The end of the movable rod 81 is slidably connected in the sliding groove 31. A drive assembly for driving the movable rod 81 is provided in the concentrated water softening sedimentation tank 3. A brush 82 is provided on the movable rod 81. A connecting rod 83 parallel to the movable rod 81 and inserted into the movable rod 81 is fixed at the upper end of the brush 82. A sliding sleeve 84 is slidably connected on the movable rod 81. A flat key is fixed on the movable rod 81 and is slidably connected to the sliding sleeve 84. A torsion spring 85 is provided between the sliding sleeve 84 and the movable rod 81 to connect the two.

[0039] When acidic wastewater is descaled inside the concentrated water softening sedimentation tank 3, the drive component drives the moving rod 81 to move, and the moving rod 81 drives the brush bristles to move, so that the brush 82 brushes along the surface of the dirt, thereby accelerating the dissolution rate of the dirt. The brush 82 can rotate relative to the moving rod 81 through the connecting rod 83. In addition, the sliding sleeve 84 and the torsion spring 85 can make the brush 82 apply pressure to the dirt, which facilitates brushing away the dirt residue and increases the contact area between the dirt and the acidic wastewater.

[0040] The drive assembly includes a lead screw rotatably connected in the slide 31. The lead screw passes through the moving rod 81 and is threadedly connected to the moving rod 81. A servo motor for driving the lead screw is provided on the outside of the concentrate softening sedimentation tank 3. The bottom of the slide 31 is wavy. Both ends of the connecting rod 83 extend out of the moving rod 81. One end of the connecting rod 83 abuts against a protrusion on the bottom of one slide 31, and the other end abuts against a recess on the bottom of another slide 31.

[0041] When the moving rod 81 moves along the slide groove 31, the connecting rod 83 moves along the bottom of the slide groove 31, causing the connecting rod 83 to swing back and forth, thereby driving the brush 82 to swing back and forth, thus improving the cleaning efficiency of the brush 82.

[0042] This application also discloses a descaling method for a descaling device in a reverse osmosis concentrate treatment system, comprising the following steps: S100: When the system's output water volume is lower than the set value (30t / h), the cleaning program is started, and then the liquid level of the treatment system is reduced, the reverse osmosis concentrate treatment process is stopped, and the addition of sodium hydroxide, sodium carbonate, PAC, PAM, etc. is stopped. S200, introduce acidic wastewater from the acid continuous rolling process into the neutralization tank 1, turn on the sludge pump 6 of the concentrated water softening sedimentation tank 3, connect it to the neutralization tank 1, establish internal circulation in the system, start the stirring component 7, and accelerate descaling in the concentrated water coagulation tank 2. S300 controls the amount of acidic wastewater added through online pH monitoring, so that the pH in the system is maintained between 4 and 5. The acidic wastewater is used to dissolve calcium carbonate precipitate. The descaling auxiliary mechanism 8 drives the brush 82 to move, and the brush 82 cleans the calcium carbonate at the bottom of the concentrated water softening sedimentation tank 3. After cleaning S400, stop introducing acidic wastewater, discharge wastewater containing dissolved calcium salts to the subsequent treatment unit, and restore the system to normal operation.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A descaling device for a reverse osmosis concentrate treatment system, characterized in that: The system includes a neutralization tank (1), a concentrated water softening tank (11), a concentrated water coagulation tank (2), a concentrated water softening sedimentation tank (3), a pH adjustment tank (4), and a clear water tank (5) arranged in sequence. The concentrated water softening sedimentation tank (3) is connected to a sludge pump (6) through a pump pipe, and the sludge pump (6) is also connected to the neutralization tank (1) through a pump pipe.

2. The descaling device for a reverse osmosis concentrate treatment system according to claim 1, characterized in that: The concentrated water coagulation tank (2) is equipped with a stirring assembly (7). The stirring assembly (7) includes a support plate installed on the concentrated water coagulation tank (2). A drive motor (71) is installed on the support plate. The output shaft of the drive motor (71) passes through the support plate and is equipped with an agitator.

3. The descaling device for a reverse osmosis concentrate treatment system according to claim 2, characterized in that: The agitator includes an inner ring (72) disposed on the output shaft. A middle ring (73) and an outer ring (74) of the same axis are disposed in sequence outside the inner ring (72). A plurality of evenly distributed inner stirring blades (75) are disposed between the middle ring (73) and the inner ring (72). A plurality of evenly distributed outer stirring blades (76) are disposed between the outer ring (74) and the middle ring (73).

4. The descaling device for a reverse osmosis concentrate treatment system according to claim 3, characterized in that: The inner stirring blades (75) and the outer stirring blades (76) are tilted in opposite directions.

5. The descaling device for a reverse osmosis concentrate treatment system according to claim 4, characterized in that: The inner stirring blade (75) is provided with rotating rods (77) at both ends, and is rotatably connected to the inner ring (72) and the middle ring (73) through the rotating rods (77). The inner ring (72) is slidably connected with a drive block (78) corresponding to the rotating rod (77). The drive block (78) is threadedly connected to the rotating rod (77) through ball bearings. A return spring (79) is also provided between the drive block (78) and the inner ring (72) to connect the two. The outer stirring blade (76) is connected to the middle ring (73) and the outer ring (74) through the same structure as the inner stirring blade (75).

6. The descaling device for a reverse osmosis concentrate treatment system according to claim 1, characterized in that: The concentrated water softening sedimentation tank (3) is equipped with a descaling auxiliary mechanism (8). The descaling auxiliary mechanism (8) includes a movable rod (81) located at the bottom of the concentrated water softening sedimentation tank (3). The movable rod (81) is slidably connected to the concentrated water softening sedimentation tank (3). The concentrated water softening sedimentation tank (3) is equipped with a driving assembly for driving the movable rod (81). A brush (82) is provided on the movable rod (81). A connecting rod (83) is provided at the upper end of the brush (82) and is parallel to the movable rod (81) and inserted into the movable rod (81). A sliding sleeve (84) is provided on the movable rod (81) and is only slidably connected. A torsion spring (85) is provided between the sliding sleeve (84) and the movable rod (81).

7. The descaling device for a reverse osmosis concentrate treatment system according to claim 6, characterized in that: The concentrated water softening sedimentation tank (3) has grooves (31) on both sides of the bottom. The moving rod (81) is slidably connected in the grooves (31). The driving assembly includes a lead screw that is rotatably connected in the grooves (31) and drives the moving rod (81). The bottom of the grooves (31) is wavy. Both ends of the connecting rod (83) protrude from the moving rod (81). One end of the connecting rod (83) abuts against the protrusion at the bottom of one grooves (31), and the other end abuts against the depression at the bottom of another grooves (31).

8. A descaling method for a descaling device in a reverse osmosis concentrate treatment system according to any one of claims 6-7, characterized in that, Includes the following steps: S100, lower the liquid level in the treatment system and stop the reverse osmosis concentrate treatment process; S200, introduce acidic wastewater from the acid rolling mill into the neutralization tank (1), turn on the sludge pump (6) of the concentrated water softening sedimentation tank (3) and connect it to the neutralization tank (1) to establish internal circulation in the system; S300 controls the amount of acidic wastewater added through online pH monitoring, maintaining the pH in the system between 4 and 5, and using the acidic wastewater to dissolve calcium carbonate precipitate. After cleaning S400, stop introducing acidic wastewater, discharge wastewater containing dissolved calcium salts to the subsequent treatment unit, and restore the system to normal operation.

9. The descaling method of the descaling device for a reverse osmosis concentrate treatment system according to claim 8, characterized in that: In step S300, the descaling auxiliary mechanism (8) drives the brush (82) to move, and the brush (82) cleans the calcium carbonate at the bottom of the concentrated water softening sedimentation tank (3).

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