A high-efficiency two-stage reverse osmosis wastewater treatment system

Abstract

This application provides a high-efficiency two-stage reverse osmosis wastewater treatment system, comprising a water storage unit, a filtration unit, a primary reverse osmosis unit, and a secondary reverse osmosis unit. In the filtration unit, the first and second filter plates within the main filter box are spaced apart along the wastewater transport direction, dividing the main filter box into a primary filtration chamber, a buffer chamber, and a secondary filtration chamber. This application effectively improves filtration capacity and efficiency through the structural design of the filtration unit. During wastewater treatment, large particulate impurities are initially intercepted in the primary filtration chamber, the buffer chamber stabilizes the water flow, and then the secondary filtration chamber deeply filters out tiny suspended particles and colloids, reducing the amount of impurities entering the reverse osmosis unit and preventing their deposition on the reverse osmosis membrane surface. This reduces the risk of membrane flux decline, thereby reducing system operating energy consumption, lowering maintenance costs, extending the service life of the reverse osmosis unit, and achieving high-efficiency wastewater treatment. It also has the advantages of being easy to promote and implement.

Description

Technical Field

[0001] This application belongs to the field of industrial wastewater treatment technology, specifically relating to a high-efficiency two-stage reverse osmosis wastewater treatment system. Background Technology

[0002] In existing technologies, industrial wastewater treatment systems are of great significance for environmental protection and resource recycling. Among numerous wastewater treatment technologies, two-stage reverse osmosis systems, with their highly efficient desalination and impurity removal capabilities, are widely used in industrial wastewater reuse, effectively recovering water resources and reducing the environmental pressure from wastewater discharge. However, current two-stage reverse osmosis industrial wastewater treatment systems on the market face some problems that urgently need to be addressed in practical applications.

[0003] In existing technologies, industrial wastewater needs to be filtered before reverse osmosis treatment to remove large particulate impurities, preventing them from fouling and clogging the reverse osmosis membrane, thus extending the membrane's lifespan and ensuring stable system operation. However, existing filtration units have certain drawbacks. Firstly, their filtration precision is limited, failing to effectively intercept tiny suspended particles and colloids. Once these impurities enter the reverse osmosis system, they gradually accumulate on the membrane surface, leading to decreased membrane flux and increased system energy consumption and maintenance costs. Secondly, the structural design of the filtration units is not optimal, easily creating filtration dead zones, allowing some wastewater to enter subsequent treatment stages without sufficient filtration, reducing the overall system's treatment efficiency and water quality assurance capabilities.

[0004] Therefore, improvements are urgently needed to enhance the treatment efficiency, stability, and adaptability of the two-stage reverse osmosis industrial wastewater treatment system, so as to better meet the needs of industrial wastewater treatment and achieve the goals of efficient water resource recycling and environmental protection. Utility Model Content

[0005] This application addresses the technical problem in existing reverse osmosis wastewater treatment processes where the filtration capacity and efficiency of the filter units are low, failing to intercept tiny suspended particles and colloids. These tiny suspended particles and colloids, once entering the reverse osmosis unit, will deposit on the surface of the reverse osmosis membrane, leading to a decrease in membrane flux, increased energy consumption and maintenance costs of the reverse osmosis system, and reduced lifespan of the reverse osmosis unit. The proposed solution is a highly efficient two-stage reverse osmosis wastewater treatment system.

[0006] This application adopts the following scheme: a high-efficiency two-stage reverse osmosis wastewater treatment system, including a water storage unit, a filtration unit connected to the water storage unit by a pipeline, a primary reverse osmosis unit connected to the filtration unit by a pipeline, and a secondary reverse osmosis unit connected to the primary reverse osmosis unit by a pipeline. The filtration unit includes a main filter box, a first filter plate disposed in the main filter box, and a second filter plate disposed in the main filter box. The first filter plate and the second filter plate are spaced apart along the wastewater conveying direction. The first filter plate and the second filter plate together divide the main filter box into a primary filtration chamber, a buffer chamber, and a secondary filtration chamber.

[0007] In some feasible embodiments, the filtration unit further includes an inlet pipe disposed on one side of the main filter box and an outlet pipe disposed on the other side of the main filter box. The height of the axis of the inlet pipe from the bottom of the main filter box is defined as h, and the height of the axis of the outlet pipe from the bottom of the main filter box is defined as H. The h and the H satisfy the following relationship: 1.5≤H / h≤2.5.

[0008] In some feasible embodiments, the primary filtration chamber is provided with a first filter layer and a second filter layer stacked from bottom to top. The first filter layer is made of ceramic particles, and the second filter layer is made of activated carbon microparticles.

[0009] In some feasible embodiments, the thickness of the first filter layer is greater than the thickness of the second filter layer. The particle size R of the ceramic particles in the first filter layer is defined as the particle size r of the activated carbon particles in the second filter layer. The R and the r satisfy the following relationship: 15mm≤R≤30mm; 6mm≤r≤12mm.

[0010] In some feasible embodiments, the first filter plate has a grid section at the end away from the bottom of the main filter box, the grid section being used to connect the primary filter chamber and the buffer chamber.

[0011] In some feasible embodiments, the second filter plate has first filter holes arranged at intervals along its length and width directions, and the first filter holes are used to connect the secondary filter chamber and the buffer chamber.

[0012] The filtration unit also includes a secondary filter box matched and disposed in the secondary filtration chamber, the secondary filter box being filled with filter fibers.

[0013] In some feasible embodiments, the secondary filter box has second filter holes arranged at intervals along its length and width on the side away from the second filter plate. The second filter holes are used to connect the secondary filter box to the water outlet pipe. The aperture of the first filter hole is defined as A, and the aperture of the second filter hole is defined as B. A and B satisfy the following relationship: 2.5≤A / B≤5.

[0014] In some feasible embodiments, a flow guide is provided between the secondary filtration chamber and the outlet pipe, the flow guide being used to guide the industrial wastewater filtered by the primary and secondary filtration chambers to the outlet pipe.

[0015] In some feasible embodiments, the filter fiber is made of any one of polypropylene fiber, polyester fiber, or nylon fiber, and the diameter of the filter fiber is defined as C, wherein C satisfies the following relationship: 0.05mm≤C≤0.1mm.

[0016] In some feasible embodiments, the secondary filter box further includes a lifting part disposed on the top of the secondary filter box, the lifting part being used to connect with a lifting assembly to lift the secondary filter box into or out of the secondary filter chamber.

[0017] In some feasible embodiments, the main filter box further includes a discharge section disposed at the bottom of the primary filter chamber, the discharge section being used to discharge the first filter layer and the second filter layer to the outside of the primary filter chamber, the discharge section including a discharge port disposed at the bottom of the primary filter chamber, and a sealing cover disposed on the outside of the main filter box at a position corresponding to the discharge port.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] This application provides a high-efficiency two-stage reverse osmosis wastewater treatment system, comprising a water storage unit, a filtration unit, a primary reverse osmosis unit, and a secondary reverse osmosis unit. In the filtration unit, the first and second filter plates within the main filter box are spaced apart along the wastewater transport direction, dividing the main filter box into a primary filtration chamber, a buffer chamber, and a secondary filtration chamber. This application effectively improves filtration capacity and efficiency through the structural design of the filtration unit. During wastewater treatment, large particulate impurities are initially intercepted in the primary filtration chamber, the buffer chamber stabilizes the water flow, and then the secondary filtration chamber deeply filters out tiny suspended particles and colloids, reducing the amount of impurities entering the reverse osmosis unit and preventing their deposition on the reverse osmosis membrane surface. This reduces the risk of membrane flux decline, thereby reducing system operating energy consumption, lowering maintenance costs, extending the service life of the reverse osmosis unit, and achieving high-efficiency wastewater treatment. It also has the advantages of being easy to promote and implement. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a high-efficiency two-stage reverse osmosis wastewater treatment system according to this application;

[0021] Figure 2 This is a schematic diagram of the structure of the filtering unit in this application;

[0022] Figure 3 This is a top view of the filtering unit of this application;

[0023] Figure 4 This application Figure 3 Sectional view at point AA;

[0024] Figure 5 Is this application in use status? Figure 3 Sectional view at point AA;

[0025] Figure 6 This is a schematic diagram of the exploded structure of the filtering unit in this application;

[0026] Figure 7 This is a structural schematic diagram of the filtering unit of this application from another perspective;

[0027] Figure 8 This is a schematic diagram of the sub-filter box of this application;

[0028] Figure 9 This is a structural schematic diagram of the secondary filter box from another perspective. Detailed Implementation

[0029] Combination Figure 1-9 The contents shown further illustrate the technical solution provided in this application. This application provides a high-efficiency two-stage reverse osmosis wastewater treatment system, including a water storage unit 1, a filter unit 2 connected to the water storage unit 1 by a pipeline, a first-stage reverse osmosis unit 3 connected to the filter unit 2 by a pipeline, and a second-stage reverse osmosis unit 4 connected to the first-stage reverse osmosis unit 3 by a pipeline. The filter unit 2 includes a main filter box 20, a first filter plate 21 disposed in the main filter box 20, and a second filter plate 22 disposed in the main filter box 20. The first filter plate 21 and the second filter plate 22 are spaced apart along the wastewater conveying direction. The first filter plate 21 and the second filter plate 22 together divide the main filter box 20 into a first-stage filtration chamber 23, a buffer chamber 24, and a second-stage filtration chamber 25.

[0030] This application provides a high-efficiency two-stage reverse osmosis wastewater treatment system, comprising a water storage unit, a filtration unit, a primary reverse osmosis unit, and a secondary reverse osmosis unit. In the filtration unit, the first and second filter plates within the main filter box are spaced apart along the wastewater transport direction, dividing the main filter box into a primary filtration chamber, a buffer chamber, and a secondary filtration chamber. This application effectively improves filtration capacity and efficiency through the structural design of the filtration unit. During wastewater treatment, large particulate impurities are initially intercepted in the primary filtration chamber, the buffer chamber stabilizes the water flow, and then the secondary filtration chamber deeply filters out tiny suspended particles and colloids, reducing the amount of impurities entering the reverse osmosis unit and preventing their deposition on the reverse osmosis membrane surface. This reduces the risk of membrane flux decline, thereby reducing system operating energy consumption, lowering maintenance costs, extending the service life of the reverse osmosis unit, and achieving high-efficiency wastewater treatment. It also has the advantages of being easy to promote and implement.

[0031] In this embodiment, the filter unit 2 further includes an inlet pipe 26 located on one side of the main filter box 20 and an outlet pipe 27 located on the other side of the main filter box 20. The height of the axis of the inlet pipe 26 from the bottom of the main filter box 20 is defined as h, and the height of the axis of the outlet pipe 27 from the bottom of the main filter box 20 is defined as H. The h and H satisfy the following relationship: 1.5≤H / h≤2.5.

[0032] In actual implementation, the inlet pipe is located at one end near the bottom of the main filter box, and H / h = 2. By further designing the height of the inlet and outlet pipes, when the first and second filter layers are set in the primary filter chamber, the industrial wastewater can fully contact the first and second filter layers, effectively intercepting larger suspended particles and impurities, and initially purifying the industrial wastewater.

[0033] In actual implementation, a sliding assembly is provided between the first filter plate and the main filter box. The first filter plate can slide along the length of the main filter box through the sliding assembly to adjust the volume of the primary filter chamber.

[0034] For example, the sliding component includes a slide rail disposed at the bottom of the main filter box, and a slider disposed at the position of the first filter plate corresponding to the slide rail, the slider being matched and disposed within the slide rail.

[0035] For example, the sliding assembly further includes fastening holes provided on the slide rail and the slider, and fasteners matched in the fastening holes to fix the first filter plate to the main filter box.

[0036] In this embodiment, the primary filtration chamber 23 is provided with a first filter layer 5 and a second filter layer 6 stacked from bottom to top. The first filter layer 5 is made of ceramic particles, and the second filter layer 6 is made of activated carbon particles.

[0037] In this embodiment, the thickness of the first filter layer 5 is greater than the thickness of the second filter layer 6. The particle size R of the ceramic particles in the first filter layer 5 and the particle size r of the activated carbon particles in the second filter layer 6 are defined. The R and the r satisfy the following relationship: 15mm≤R≤30mm; 6mm≤r≤12mm.

[0038] In actual implementation, after industrial wastewater enters the primary filtration chamber, it comes into contact with the first filtration layer. The first filtration layer effectively intercepts large suspended solids and impurities in the wastewater, playing a preliminary filtration role. The porous structure of the ceramic particles increases the filtration area, and their high hardness allows them to withstand significant water flow impact, ensuring the stability and durability of the filtration layer.

[0039] In actual implementation, the industrial wastewater, after preliminary filtration through the first filtration layer, continues to flow upwards into the second filtration layer. The second filtration layer adsorbs organic matter, pigments, odor substances, and fine suspended particles from the wastewater. The small particle size of the activated carbon further filters out the fine impurities remaining after the first filtration layer, achieving a more refined filtration effect. By simultaneously setting up the first and second filtration layers, the wastewater can achieve step-by-step filtration and adsorption from large particles to small particles as it passes through the primary filtration chamber, offering advantages such as high filtration efficiency and high filtration precision.

[0040] In this embodiment, the first filter plate 21 is provided with a grid section 210 at the bottom end away from the main filter box 20. The grid section 210 is used to connect the primary filter chamber 23 and the buffer chamber 24.

[0041] In this embodiment, the second filter plate 22 is provided with first filter holes 220 at intervals along its length and width directions. The first filter holes 220 are used to connect the secondary filter chamber 25 and the buffer chamber 24.

[0042] The filtration unit 2 also includes a secondary filter box 7 matched within the secondary filtration chamber 25, the secondary filter box 7 being filled with filter fibers 8.

[0043] In this embodiment, the secondary filter box 7 has second filter holes 71 arranged at intervals along its length and width on the side away from the second filter plate 22. The second filter holes 71 are used to connect the secondary filter box 7 to the water outlet pipe 27. The diameter of the first filter hole 220 is defined as A, and the diameter of the second filter hole 71 is defined as B. A and B satisfy the following relationship: 2.5≤A / B≤5.

[0044] In this embodiment, the material of the filter fiber 8 is selected from polypropylene fiber, polyester fiber, and nylon fiber. The diameter of the filter fiber 8 is defined as C, and C satisfies the following relationship: 0.05mm≤C≤0.1mm.

[0045] In actual implementation, polyester fiber is selected as the filter fiber. The filter fiber is filled in the secondary filter box, which can effectively adsorb and intercept fine particles, colloids, dissolved organic matter, and activated carbon particles in industrial wastewater, significantly reducing the solid content in industrial wastewater and preventing the accumulation of fine particles and colloids in the primary / secondary reverse osmosis unit, thus significantly improving the service life of the primary / secondary reverse osmosis unit.

[0046] In this embodiment, the secondary filter box 7 also includes a hoisting part 70 located on the top of the secondary filter box 7. The hoisting part 70 is used to connect with a hoisting assembly (hook or ring) to hoist the secondary filter box 7 into or out of the secondary filter chamber 25.

[0047] In actual implementation, when maintenance of the filter unit is required, the secondary filter box can be removed from the secondary filter chamber through the hoisting unit, and the filter fibers in the secondary filter box can be replaced, which significantly reduces maintenance time and improves the user experience.

[0048] In this embodiment, the main filter box 20 further includes a discharge section 9 located at the bottom of the primary filter chamber 23. The discharge section 9 is used to discharge the first filter layer 5 and the second filter layer 6 to the outside of the primary filter chamber 23. The discharge section 9 includes a discharge port 90 located at the bottom of the primary filter chamber 23 and a sealing cover 91 located on the outside of the main filter box 20 at the position corresponding to the discharge port 90.

[0049] In actual implementation, during the wastewater treatment process, the first filter layer (ceramic particles) and the second filter layer (activated carbon particles) will gradually accumulate and intercept impurities. When the first filter layer and the second filter layer reach their filtration limits, they can be quickly discharged from the primary filter chamber through the discharge section, effectively ensuring the filtration capacity of the first filter layer and the second filter layer.

[0050] In actual implementation, such as Figure 1 As shown, industrial wastewater enters the first-stage reverse osmosis unit after being filtered by the filtration unit from the water storage unit. After reverse osmosis treatment in the first-stage reverse osmosis unit, a first purified stream and a first waste liquid are produced. Since the first waste liquid has been filtered, it can be directly used for flushing toilets, washing floors, irrigating green spaces, or returned to the water storage unit. The first purified stream is then transported to the second-stage reverse osmosis unit for reverse osmosis treatment, which produces a second purified stream and a second waste liquid. After the second-stage reverse osmosis treatment, the water quality of the second purified stream is better than that of tap water and can be used directly for daily purposes. The second waste liquid can be returned to the water storage unit to improve the utilization rate of industrial wastewater.

[0051] This application provides a high-efficiency two-stage reverse osmosis wastewater treatment system, comprising a water storage unit, a filtration unit, a primary reverse osmosis unit, and a secondary reverse osmosis unit. In the filtration unit, the first and second filter plates within the main filter box are spaced apart along the wastewater transport direction, dividing the main filter box into a primary filtration chamber, a buffer chamber, and a secondary filtration chamber. This application effectively improves filtration capacity and efficiency through the structural design of the filtration unit. During wastewater treatment, large particulate impurities are initially intercepted in the primary filtration chamber, the buffer chamber stabilizes the water flow, and then the secondary filtration chamber deeply filters out tiny suspended particles and colloids, reducing the amount of impurities entering the reverse osmosis unit and preventing their deposition on the reverse osmosis membrane surface. This reduces the risk of membrane flux decline, thereby reducing system operating energy consumption, lowering maintenance costs, extending the service life of the reverse osmosis unit, and achieving high-efficiency wastewater treatment. It also has the advantages of being easy to promote and implement.

[0052] The above are merely embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency two-stage reverse osmosis wastewater treatment system, characterized in that, The system includes a water storage unit (1), a filter unit (2) connected to the water storage unit (1) by a pipeline, a primary reverse osmosis unit (3) connected to the filter unit (2) by a pipeline, and a secondary reverse osmosis unit (4) connected to the primary reverse osmosis unit (3) by a pipeline. The filter unit (2) includes a main filter box (20), a first filter plate (21) disposed in the main filter box (20), and a second filter plate (22) disposed in the main filter box (20). The first filter plate (21) and the second filter plate (22) are arranged at intervals along the wastewater conveying direction. The first filter plate (21) and the second filter plate (22) together divide the main filter box (20) into a primary filtration chamber (23), a buffer chamber (24), and a secondary filtration chamber (25).

2. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 1, characterized in that, The filter unit (2) further includes an inlet pipe (26) located on one side of the main filter box (20) and an outlet pipe (27) located on the other side of the main filter box (20). The height of the axis of the inlet pipe (26) from the bottom of the main filter box (20) is defined as h, and the height of the axis of the outlet pipe (27) from the bottom of the main filter box (20) is defined as H. The h and the H satisfy the following relationship: 1.5≤H / h≤2.

5.

3. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 1, characterized in that, The primary filtration chamber (23) is provided with a first filter layer (5) and a second filter layer (6) stacked from bottom to top. The material of the first filter layer (5) is ceramic particles, and the material of the second filter layer (6) is activated carbon microparticles.

4. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 3, characterized in that, The thickness of the first filter layer (5) is greater than the thickness of the second filter layer (6). The particle size R of the ceramic particles in the first filter layer (5) and the particle size r of the activated carbon particles in the second filter layer (6) are defined. The R and the r satisfy the following relationship: 15mm≤R≤30mm; 6mm≤r≤12mm.

5. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 1, characterized in that, The first filter plate (21) has a grid section (210) on one end away from the bottom of the main filter box (20), and the grid section (210) is used to connect the primary filter chamber (23) and the buffer chamber (24).

6. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 2, characterized in that, The second filter plate (22) has first filter holes (220) arranged at intervals along its length and width directions. The first filter holes (220) are used to connect the secondary filter chamber (25) and the buffer chamber (24). The filter unit (2) further includes a secondary filter box (7) matched within the secondary filter chamber (25), the secondary filter box (7) being filled with filter fibers (8).

7. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 6, characterized in that, The secondary filter box (7) has second filter holes (71) arranged at intervals along its length and width on the side away from the second filter plate (22). The second filter holes (71) are used to connect the secondary filter box (7) to the water outlet pipe (27). The aperture of the first filter hole (220) is defined as A, and the aperture of the second filter hole (71) is defined as B. A and B satisfy the following relationship: 2.5≤A / B≤5.

8. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 6, characterized in that, The material of the filter fiber (8) is selected from any one of polypropylene fiber, polyester fiber, and nylon fiber. The diameter of the filter fiber (8) is defined as C, and C satisfies the following relationship: 0.05mm≤C≤0.1mm.

9. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 6, characterized in that, The secondary filter box (7) also includes a lifting part (70) located on its top, which is used to connect with the lifting assembly to lift the secondary filter box (7) into or out of the secondary filter chamber (25).

10. The high-efficiency two-stage reverse osmosis wastewater treatment system according to claim 3, characterized in that, The main filter box (20) also includes a discharge section (9) located at the bottom of the primary filter chamber (23). The discharge section (9) is used to discharge the first filter layer (5) and the second filter layer (6) to the outside of the primary filter chamber (23). The discharge section (9) includes a discharge port (90) located at the bottom of the primary filter chamber (23) and a sealing cover (91) located on the outside of the main filter box (20) at the position corresponding to the discharge port (90).

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