Multi-channel differential pressure reverse osmosis wastewater concentration device

Abstract

The utility model relates to wastewater concentration treatment technical field discloses a kind of multi-channel differential pressure reverse osmosis wastewater concentration equipment, including multilayer permeation membrane unit, and the clamping assembly for clamping permeation membrane unit;Permeation membrane unit includes reverse osmosis membrane and filter plate, reverse osmosis membrane is located in filter plate middle and both sides are equipped with flow channel, respectively flow have first solution and second solution, the filter plate on the both sides of reverse osmosis membrane is opened and water inlet and water outlet, the water inlet, water outlet and flow channel in each permeation membrane unit located in the same side of reverse osmosis membrane are communicated and form first solution channel and second solution channel independent of each other, the pressure in first solution channel is greater than second solution channel and the concentration of first solution in it is not less than second solution.The utility model effectively fills the market and technical blank of differential pressure reverse osmosis equipment, effectively improves wastewater concentration concentration.

Description

Technical Field

[0001] This utility model relates to the field of wastewater concentration and treatment technology, specifically to a multi-channel differential pressure reverse osmosis wastewater concentration device. Background Technology

[0002] Concentration is a common step in wastewater treatment. By reducing the volume of wastewater, the amount of wastewater discharged can be effectively reduced, alleviating environmental pressure. Furthermore, concentrated wastewater facilitates the recovery and reuse of valuable metals, chemicals, or other substances it contains. Reverse osmosis systems are currently the most widely used non-thermal concentration method, offering advantages such as high-quality product water and low operating costs. However, existing reverse osmosis systems suffer from significant differences in wastewater concentration across the membrane, with the osmotic pressure on the desalination side being almost zero. This increases the technical difficulty of further increasing the operating pressure on the concentrate side. To overcome the bottleneck of traditional reverse osmosis technology, differential pressure reverse osmosis technology was developed. The principle of differential pressure reverse osmosis technology is to place solutions of the same solute but with different concentrations on both sides of the membrane. Due to the difference in concentration, the two sides of the membrane have different osmotic pressures. To allow the solvent in the concentrated solution to pass through the membrane into the dilute solution, the pressure required is exactly equal to the osmotic pressure difference between the concentrated and dilute solutions. This requires applying additional pressure to the concentrated solution, which is lower than the osmotic pressure between concentrated water and pure water. In this technology, the other side of the membrane is not pure water, but a dilute solution of the same solute, and this dilute solution needs to have independent inlet and outlet. In this way, differential pressure reverse osmosis technology can effectively increase the concentration of wastewater, bringing a new breakthrough to wastewater treatment.

[0003] However, currently available reverse osmosis membranes are all spiral-wound membranes. The membrane is wound around a central tube and encased in a shell. Solvents in the wastewater permeate through the membrane and collect in the central tube before being discharged. The concentrated wastewater then exits through the channel between the membrane and the shell. Because the permeate flow path is spirally oriented inwards around the central tube, the flow path is narrow and the flow rate is long. If spiral-wound reverse osmosis membranes are used for differential pressure reverse osmosis, with the openings at both ends of the central tube as the freshwater inlet and outlet, the dilute solution cannot reach the membrane layers other than the innermost layer and flows away directly, thus failing to effectively reduce the osmotic pressure difference across the membrane. Therefore, there is a lack of dedicated wastewater concentration equipment on the market suitable for this technology.

[0004] To fill this market gap in equipment and technology, the applicant, through in-depth research and repeated practice, developed a multi-channel differential pressure reverse osmosis wastewater concentration device. Utility Model Content

[0005] The present invention aims to provide a multi-channel differential pressure reverse osmosis wastewater concentration device to solve the problem that existing reverse osmosis membrane systems cannot use differential pressure reverse osmosis technology for wastewater concentration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-channel differential pressure reverse osmosis wastewater concentration device, comprising a multi-layer permeation membrane unit and a clamping assembly for clamping the permeation membrane unit; the permeation membrane unit includes a reverse osmosis membrane and a filter plate, the reverse osmosis membrane is located in the middle of the filter plate and has flow channels on both sides, through which a first solution and a second solution flow respectively, and the filter plates on both sides of the reverse osmosis membrane have inlet and outlet water outlets, and the inlet, outlet water outlet and flow channels on the same side of the reverse osmosis membrane in each permeation membrane unit are connected to form an independent first solution channel and second solution channel, the pressure in the first solution channel is greater than that in the second solution channel and the concentration of the first solution in it is not less than that of the second solution.

[0007] The principle and advantages of this scheme are:

[0008] This invention establishes independent first and second solution channels through a reverse osmosis membrane unit. First and second solutions of the same solute with different concentrations flow through these channels into a concentration device. During flow, the pressure difference between the two solutions causes the solvent in the first solution to pass through the reverse osmosis membrane to the other side, thus concentrating the first solution. Compared to traditional reverse osmosis systems, the independent first and second solution channels in this wastewater concentration device allow both solutions to flow simultaneously, achieving differential pressure reverse osmosis technology, and offering the following advantages:

[0009] 1. This utility model effectively improves the concentration: Through the synergistic effect of multi-channel design and differential pressure reverse osmosis technology, this equipment breaks through the limitations of traditional equipment in terms of concentration capacity, achieving a higher concentration. A higher concentration means that more valuable substances can be extracted from the same volume of wastewater, improving the efficiency and effectiveness of resource recovery. At the same time, the high concentration also reduces energy consumption in subsequent treatment stages, simplifies the process flow, and improves overall production efficiency.

[0010] 2. Significantly Enhanced Energy Saving and Environmental Benefits: The multi-channel differential pressure reverse osmosis wastewater concentration equipment significantly reduces wastewater discharge by optimizing the wastewater concentration process. Higher concentrations result in a substantial reduction in the volume of treated wastewater, lowering the pressure on subsequent wastewater treatment stages and reducing water waste during treatment, aligning with national energy conservation and emission reduction strategies. Furthermore, the equipment effectively recovers and reuses valuable metals and chemicals from wastewater, reducing resource extraction and consumption, lowering dependence on natural resources, and practicing green environmental protection principles from a resource recycling perspective, providing strong support for sustainable development.

[0011] 3. This invention effectively reduces energy consumption for concentration: Traditional spiral wound reverse osmosis membrane equipment suffers from narrow flow channels and long flow paths, resulting in high fluid flow resistance within the equipment and requiring more energy to drive the wastewater treatment process. In contrast, the multi-channel differential pressure reverse osmosis wastewater concentration equipment, with its unique multi-channel structure, optimizes fluid dynamics and reduces fluid flow resistance. Simultaneously, differential pressure reverse osmosis technology utilizes the osmotic pressure difference generated by the concentration difference across the membrane to precisely control the solvent permeation process, reducing unnecessary energy loss compared to traditional reverse osmosis technology. During equipment operation, the additional pressure required is only the osmotic pressure difference between the concentrated and dilute solutions, avoiding excessive energy consumption. While achieving efficient wastewater concentration, it effectively reduces equipment energy consumption, saving enterprises significant operating costs.

[0012] 4. This utility model features a simple equipment structure and low overall cost: Although this wastewater concentration equipment represents an innovative breakthrough in technical principles, its overall structural design is relatively simple. Compared to complex traditional equipment modification schemes, this equipment, through a reasonable multi-channel layout and the ingenious application of differential pressure reverse osmosis technology, reduces unnecessary parts and complex connection structures, thereby lowering the manufacturing difficulty and production cost. During equipment operation, the simple structure makes maintenance more convenient and faster, reducing the workload and maintenance costs for maintenance personnel. Furthermore, due to its low energy consumption and high concentration efficiency, it further reduces the overall cost for enterprises in the wastewater treatment process, including energy costs, equipment maintenance costs, and subsequent treatment costs. In summary, this equipment, with its simple structure and low overall cost, provides enterprises with a more cost-effective wastewater treatment solution, which is conducive to promoting the widespread application of differential pressure reverse osmosis technology in the field of wastewater treatment.

[0013] Furthermore, the first and second solutions on both sides of the reverse osmosis membrane flow in the same direction. This symmetrical flow of the two solutions on both sides of the membrane maintains a relatively stable concentration difference, reducing fluctuations in membrane permeability caused by unstable concentration differences and ensuring wastewater concentration efficiency and quality. Simultaneously, it also reduces damage to the reverse osmosis membrane and the overall equipment, improving equipment reliability and stability.

[0014] Furthermore, both sides of the filter plate are engraved with folded flow channels, which are three-channel flow channels. The folded flow channel design makes the solution distribution on both sides of the reverse osmosis membrane more uniform, which can fully carry out differential pressure reverse osmosis and avoid insufficient permeation concentration due to excessive flow, thus ensuring the efficiency and quality of wastewater concentration.

[0015] Furthermore, the depth of the folded flow channel is 3-5 mm. Limiting the flow channel depth within this range ensures that the solutions on both sides of the reverse osmosis membrane can undergo sufficient permeation. If the flow channel is too deep, the portion of the solution far from the reverse osmosis membrane within the flow channel cannot participate in the permeation and concentration process, reducing the concentration efficiency. Conversely, if the flow channel is too shallow, the solution will flow too quickly and will not have enough time to participate in the concentration and permeation process, affecting the concentration effect.

[0016] Furthermore, a grid for supporting the folded flow channel is provided between the filter plate and the reverse osmosis membrane.

[0017] Furthermore, a clamping bolt is installed at the outlet of the filter plate, and the matching clamping nut fixes the reverse osmosis membrane and the grid, thereby isolating the first and second solution channels.

[0018] Furthermore, the clamping assembly includes plate frames located on both sides of the permeation membrane unit, and the plate frames have clearance grooves to avoid the clamping bolts.

[0019] Furthermore, the initial concentrations of the first and second solutions are the same. The smaller the concentration difference between the solutions on both sides of the reverse osmosis membrane, the smaller the osmotic pressure difference between the two solutions, the smaller the pressure required to achieve differential pressure reverse osmosis, the less additional pressure is required, the lower the energy consumption for concentration, and the more energy-efficient and environmentally friendly the process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0021] Figure 2 This is a schematic diagram of the filter plate structure according to an embodiment of the present utility model. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings include: plate frame 1, end plate 2, permeate membrane unit 3, filter plate 4, inlet 41, outlet 42, reverse osmosis membrane 5, grid 6, screw 7, mounting hole 8, folded flow channel 9, first solution inlet 10, first solution concentrate outlet 11, second solution inlet 12, second solution diluent outlet 13, first solution channel 14, second solution channel 15, clamping bolt 16, clearance groove 17.

[0024] Example 1

[0025] Combination Figure 1 , Figure 2As shown, a multi-channel differential pressure reverse osmosis wastewater concentration device includes multiple coaxially arranged permeate membrane units 3 and clamping components for clamping the permeate membrane units 3. The permeate membrane unit 3 includes a reverse osmosis membrane 5 and filter plates 4 located on both sides of it. The clamping components include plate frames 1 located on both sides of the permeate membrane unit 3. Corresponding mounting holes 8 are provided on the filter plates 4 and plate frames 1. Screws 7 are installed in the mounting holes 8, and the screws 7 connect the filter plates 4 and plate frames 1 into a whole to achieve axial through support. Flow channels are formed between the reverse osmosis membrane 5 and the filter plates 4 on both sides, through which a first solution and a second solution flow respectively. Each filter plate 4 has an axial inlet 41 and an outlet 42. The inlets 41 and outlets 42 of the two filter plates 4 in the permeate membrane unit 3 are staggered on the circumferential plane. The inlets 41 and outlets 42 on the same side of the reverse osmosis membrane 5 in each permeate membrane unit 3 and the flow channels are connected to form independent first solution channels 14 and second solution channels 15. The pressure in the first solution channel 14 is greater than that in the second solution channel 15, and the concentration of the first solution in the channel is not less than that of the second solution.

[0026] The plate frames 1 at both ends are end plates 2, each with an interface. One end's interface is the first solution inlet 10 and the second solution diluent outlet 13, while the other end's interface is the first solution concentrate outlet 11 and the second solution inlet 12. The first and second solutions flow in the same direction on both sides of the reverse osmosis membrane 5, thereby maintaining a relatively stable concentration difference across the membrane, reducing fluctuations in membrane permeability caused by unstable concentration differences, and ensuring wastewater concentration efficiency and quality. Figure 1 The diagram illustrates the flow paths of the first and second solutions within the device. Solid arrows represent the flow path of the first solution, while hollow arrows represent the flow path of the second solution.

[0027] A high-pressure pump is connected to the end of the first solution inlet 10. The high-pressure pump acts on the first solution to increase its pressure, meeting the pressure difference requirement of differential pressure reverse osmosis. Preferably, in this embodiment, the initial concentrations of the first solution and the second solution are the same, so as to reduce the osmotic pressure difference between the two solutions. The smaller the pressure that needs to be overcome to achieve differential pressure reverse osmosis, the less additional pressure is required, thus reducing energy consumption.

[0028] The filter plate 4 is engraved with folded channels 9, which are three-channel channels with a depth of 3-5 mm. The purpose of folded channels 9 and channel depth is to ensure that the first and second solutions are evenly distributed on both sides of the reverse osmosis membrane 5, so as to perform sufficient differential pressure reverse osmosis and avoid the solution flow rate being too fast to allow for permeation.

[0029] A grid 6 for supporting the folded flow channel 9 is provided between the filter plate 4 and the reverse osmosis membrane 5. A clamping bolt 16 is installed at the outlet 42 of the filter plate 4, and its matching clamping nut fixes the reverse osmosis membrane 5 and the grid 6, thus isolating the first and second solution channels 15. The plate frame 1 has a relief groove 17 at the corresponding position of the clamping bolt 16 to prevent interference between the plate frame 1 and the clamping bolt 16, and also to ensure that the two plate frames 1 can press and fix the middle permeate membrane unit 3 to ensure airtightness.

[0030] This differential pressure reverse osmosis wastewater concentration device forms independent first solution channels 14 and second solution channels 15 through alternately arranged plate and frame units 1 and membrane units 3. First solutions and second solutions of the same solute with different concentrations flow through the concentration device via the first solution channels 14 and second solution channels 15, respectively. During the flow, the pressure difference between the two solutions causes the solvent in the first solution to pass through the reverse osmosis membrane 5 to the other side, thus concentrating the first solution. Compared to traditional reverse osmosis systems, the independent first solution channels 14 and second solution channels 15 in this wastewater concentration device allow both solutions to flow simultaneously, realizing differential pressure reverse osmosis technology. This fills the market and technological gap in differential pressure reverse osmosis equipment and is conducive to promoting the widespread application of differential pressure reverse osmosis technology in the field of wastewater treatment.

[0031] Example 2

[0032] The difference between this embodiment and Embodiment 1 is that the inlet 41 and outlet 42 on the filter plate 4 are not arranged axially, but radially, distributed around the circumference of the filter plate 4. Connecting pipes are then installed on the outside of the filter plate 4 to connect the corresponding inlet 41 / outlet 42 in adjacent membrane units 3, ensuring that the first solution channel 14 and the second solution channel 15 are independent and unobstructed. Compared to Embodiment 1, the radial arrangement of the inlet and outlet 42 on the filter plate 4 results in better sealing between the filter plate 4 and the reverse osmosis membrane 5 in the membrane unit 3. However, this increases the thickness of the filter plate 4, and the external connecting pipes increase the overall space required by the equipment. Therefore, in practical applications, the arrangement of the inlet 41 and outlet 42 on the filter plate 4 can be selected according to specific process requirements.

[0033] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A multi-channel differential pressure reverse osmosis wastewater concentration device, characterized in that: The device includes a multilayer permeation membrane unit and a clamping assembly for clamping the permeation membrane unit. The permeation membrane unit includes a reverse osmosis membrane and a filter plate. The reverse osmosis membrane is located in the middle of the filter plate and has flow channels on both sides, through which a first solution and a second solution flow respectively. The filter plates on both sides of the reverse osmosis membrane have inlet and outlet ports. The inlet, outlet and flow channels on the same side of the reverse osmosis membrane in each permeation membrane unit are connected to form independent first solution channels and second solution channels. The pressure in the first solution channel is greater than that in the second solution channel and the concentration of the first solution in the first solution channel is not less than that of the second solution.

2. The multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 1, characterized in that: The first and second solutions on both sides of the reverse osmosis membrane flow in the same direction.

3. The multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 2, characterized in that: The filter plate is engraved with folded flow channels, which are three-channel flow channels.

4. A multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 3, characterized in that: The depth of the folded flow channel is 3-5mm.

5. A multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 1, characterized in that: A grid is provided between the filter plate and the reverse osmosis membrane to support the folded flow channels.

6. The multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 5, characterized in that: The filter plate is equipped with clamping bolts at the outlet, and the matching clamping nuts fix the reverse osmosis membrane and the grid, thereby isolating the first and second solution channels.

7. A multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 6, characterized in that: The clamping assembly includes a plate frame located on both sides of the permeation membrane unit, and the plate frame has a clearance groove to avoid the clamping bolt.

8. A multi-channel differential pressure reverse osmosis wastewater concentration device according to any one of claims 1-7, characterized in that: The first solution and the second solution have the same initial concentration.

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