Multi-channel differential pressure reverse osmosis wastewater concentration equipment

Abstract

The invention relates to the technical field of wastewater concentration treatment, and discloses multi-channel differential pressure reverse osmosis wastewater concentration equipment which comprises a plurality of layers of permeable membrane units and a clamping assembly for clamping the permeable membrane units, the permeable membrane unit comprises a reverse osmosis membrane and a filter plate, the reverse osmosis membrane is located in the middle of the filter plate, flow channels are formed in the two sides of the reverse osmosis membrane, and a first solution and a second solution flow through the flow channels respectively; the water inlet, the water outlet and the runner in the same side of the reverse osmosis membrane in each osmosis membrane unit are communicated and form a first solution channel and a second solution channel which are mutually independent; the pressure in the first solution channel is greater than that in the second solution channel; the concentration of a first solution in the second solution channel is not less than that of the second solution. The market and technical blank of differential pressure reverse osmosis equipment is effectively filled, and the concentration of wastewater is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater concentration treatment, and particularly relates to a multi-channel differential pressure reverse osmosis wastewater concentration device. Background Art

[0002] Concentration is a common step in the wastewater treatment process. By reducing the volume of wastewater, the effective wastewater discharge can be reduced, the pressure on the environment can be alleviated, and at the same time, it is convenient to recycle valuable metals, chemicals or other substances contained in the wastewater after concentration. The reverse osmosis system is a non-thermal concentration method that is currently used more frequently, and has the advantages of good water production quality and low operating cost. However, the concentration difference between the wastewater on both sides of the membrane in the existing reverse osmosis system is relatively large, and the osmotic pressure on the fresh water side is almost zero, resulting in an increase in the technical difficulty of further increasing the operating pressure on the concentrated water side. To break through the bottleneck of traditional reverse osmosis technology, differential pressure reverse osmosis technology has emerged. The principle of differential pressure reverse osmosis technology is to place solutions with the same solute but different concentrations on both sides of the osmotic membrane. Due to the difference in the concentration of the solutions on both sides, different osmotic pressures exist on both sides of the osmotic membrane. At this time, if the solvent in the concentrated solution is to permeate through the osmotic membrane into the dilute solution, the pressure that needs to be overcome is exactly equal to the osmotic pressure difference between the concentrated solution and the dilute solution, that is, an additional corresponding pressure needs to be applied to the concentrated solution, which is lower than the osmotic pressure between the concentrated water and pure water. In this technology, the other side of the osmotic membrane is not pure water, but a dilute solution of the same solute, and the dilute solution needs to have independent inlets and outlets. In this way, differential pressure reverse osmosis technology can effectively increase the concentration of wastewater and bring new breakthroughs to wastewater treatment.

[0003] However, the reverse osmosis membranes on the market currently are all spiral wound membranes. The reverse osmosis membrane is wound around a central tube into a spiral wound structure, and an outer shell is sleeved outside. The solvent in the wastewater permeates through the reverse osmosis membrane and converges into the central tube for discharge, and the concentrated wastewater is then discharged from the channel between the reverse osmosis membrane and the outer shell. Since the permeate flow channel is in a spiral inward shape around the central tube, the flow channel is narrow and the flow path is long. If a spiral wound reverse osmosis membrane is used for differential pressure reverse osmosis, with the two ends of the central tube being open as the fresh water side inlets and outlets, the dilute solution cannot reach the osmotic membranes of other layers except the innermost layer smoothly and will flow away directly, thus unable to effectively reduce the osmotic pressure difference between the two sides of the membrane. Therefore, there is a lack of special wastewater concentration equipment on the market that can adapt to this technology.

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

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

[0006] To achieve the above object, the present invention adopts the following technical solution: A multi-channel differential pressure reverse osmosis wastewater concentration device, comprising a multi-layer permeable membrane unit and a clamping assembly for clamping the permeable membrane unit; the permeable 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 flow channels are provided on both sides, through which a first solution and a second solution flow respectively. Water inlets and outlets are opened on the filter plates on both sides of the reverse osmosis membrane. The water inlets, outlets and flow channels on the same side of the reverse osmosis membrane in each permeable 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 it is not less than that of the second solution.

[0007] The principle and advantages of this solution are as follows:

[0008] The present invention forms independent first solution channels and second solution channels through the permeable membrane unit. The first solution and the second solution with the same / different concentrations of the same solute flow through the concentration device through the first solution channel and the second solution channel respectively. During the flow process, due to the pressure difference between the two solutions, the solvent in the first solution passes through the reverse osmosis membrane to the other side, realizing the concentration of the first solution. Compared with the traditional reverse osmosis system, the independent first solution channels and second solution channels in this wastewater concentration device allow the two solutions to flow simultaneously, realizing the differential pressure reverse osmosis technology, and having the following beneficial effects:

[0009] 1. The present invention effectively improves the concentration: Through the synergistic effect of the multi-channel design and the differential pressure reverse osmosis technology, the device breaks through the limitation of the traditional device in the concentration ability and realizes the improvement of the concentration. A higher concentration means that more valuable substances can be extracted from the same volume of wastewater, improving the efficiency and benefit of resource recovery. At the same time, the high concentration also reduces the energy consumption in the subsequent treatment process, simplifies the process flow, and improves the overall production efficiency.

[0010] 2. The energy conservation and environmental protection benefits are significantly improved: The multi-channel differential pressure reverse osmosis wastewater concentration device greatly reduces the discharge of wastewater by optimizing the wastewater concentration process. In addition, the device can effectively realize the recycling of valuable metals, chemicals and other substances in the wastewater, reduce the exploitation and consumption of resources, reduce the dependence on natural resources, and practice the concept of green environmental protection from the perspective of resource recycling, providing strong support for sustainable development.

[0011] 3. The present invention effectively reduces the energy consumption for concentration: Traditional rolled reverse osmosis membrane equipment has a narrow flow channel and a long process, which leads to a large flow resistance of the fluid in the equipment, and requires more energy to drive the wastewater treatment process. The multi-channel differential pressure reverse osmosis wastewater concentration equipment optimizes the fluid mechanics properties and reduces the fluid flow resistance by virtue of its unique multi-channel structure. At the same time, the differential pressure reverse osmosis technology uses the osmotic pressure difference generated by the concentration difference on both sides of the osmotic membrane to accurately control the penetration process of the solvent, reducing unnecessary energy loss compared to traditional reverse osmosis technology. During the operation of the equipment, the additional pressure required is only the osmotic pressure difference between the concentrated solution and the dilute solution, which avoids excessive energy consumption. While achieving efficient wastewater concentration, it effectively reduces the energy consumption of the equipment, saving the company a lot of operating costs.

[0012] 4. The equipment structure of the present invention is simple and the overall cost is low: Although the wastewater concentration equipment has made innovative breakthroughs in technical principles, the overall structural design is relatively simple. Compared with the complex traditional equipment transformation plan, the equipment reduces unnecessary parts and complex connection structures through a reasonable multi-channel layout and the clever application of differential pressure reverse osmosis technology, thereby reducing the manufacturing difficulty and production cost of the equipment. During the operation of the equipment, the simple structure makes the maintenance of the equipment more convenient and quick, reducing the workload and maintenance costs of maintenance personnel. In addition, due to the low energy consumption and high concentration efficiency of the equipment, the comprehensive cost of the enterprise in the wastewater treatment process is further reduced, including energy costs, equipment maintenance costs, and subsequent processing costs. On the whole, the 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 solution and the second solution on both sides of the reverse osmosis membrane flow in the same direction. The same flow direction of the two solutions on both sides of the reverse osmosis membrane can maintain a relatively stable concentration difference on both sides of the membrane, reduce the fluctuation of the membrane's permeability due to unstable concentration difference, and ensure the wastewater concentration efficiency and quality; at the same time, it can also reduce damage to the reverse osmosis membrane and the equipment as a whole, and improve the reliability and stability of the equipment.

[0014] Furthermore, folded channels are engraved on both sides of the filter plate, and the folded channels are three-channel channels. The folded channel design makes the solution distribution on both sides of the reverse osmosis membrane more uniform, and can fully perform differential pressure reverse osmosis, avoiding the failure to achieve osmotic concentration due to too fast flow, and ensuring the wastewater concentration efficiency and quality.

[0015] Further, 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 osmosis. If the flow channel is too deep, the part of the solution far from the reverse osmosis membrane in the flow channel cannot participate in the osmotic concentration, reducing the concentration efficiency. If the flow channel is too shallow, the solution will flow too fast to participate in the concentration osmosis, affecting the concentration effect.

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

[0017] Further, a compression bolt is installed at the water outlet of the filter plate, and the matching compression nut fixes the reverse osmosis membrane and the grid to isolate the first and second solution channels.

[0018] Further, the clamping assembly includes plate frames on both sides of the osmotic membrane unit, and avoidance grooves for avoiding the compression bolts are formed on the plate frames.

[0019] Further, the initial concentrations of the first solution and the second solution 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 overcome during differential pressure reverse osmosis, the reduction of the additional pressurization pressure, the reduction of the concentration energy consumption, and it is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the filter plate structure of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following is further detailed through specific embodiments:

[0023] The reference numerals in the accompanying drawings of the specification include: plate frame 1, end plate 2, osmotic membrane unit 3, filter plate 4, water inlet 41, water 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, compression bolt 16, avoidance groove 17.

[0024] Embodiment 1

[0025] Combined with Figure 1 、 Figure 2As shown in the figure, a multi-channel differential pressure reverse osmosis wastewater concentration device includes multiple layers of coaxially arranged osmotic membrane units 3 and a clamping assembly for clamping the osmotic membrane units 3. The osmotic membrane unit 3 includes a reverse osmosis membrane 5 and filter plates 4 on both sides thereof. The clamping assembly includes plate frames 1 on both sides of the osmotic membrane unit 3. Corresponding mounting holes 8 are provided on the filter plates 4 and the plate frames 1. A screw rod 7 is installed in the mounting hole 8, and the screw rod 7 connects the filter plates 4 and the 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, and a first solution and a second solution flow through them respectively. An axial water inlet 41 and a water outlet 42 are opened on each filter plate 4. The water inlets 41 and water outlets 42 of the two filter plates 4 in the osmotic membrane unit 3 are arranged staggeredly on the circumferential plane. The water inlets 41, water outlets 42 and flow channels on the same side of the reverse osmosis membrane 5 in each osmotic membrane unit 3 are connected and 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 it is not less than that of the second solution.

[0026] The plate frames 1 at both ends are end plates 2. Interfaces are provided at both end plates 2. One of the interfaces is a first solution inlet 10 and a second solution diluent outlet 13, and the other interface is a first solution concentrate outlet 11 and a second solution inlet 12. The flow directions of the first solution and the second solution on both sides of the reverse osmosis membrane 5 are the same, so as to maintain the relative stability of the concentration difference on both sides of the membrane, reduce the fluctuation of the osmotic performance of the membrane caused by the unstable concentration difference, and ensure the wastewater concentration efficiency and quality. As Figure 1 shown in the figure shows the flow paths of the first solution and the second solution in the device. The solid arrows represent the flow paths of the first solution, and the hollow arrows represent the flow paths of the second solution.

[0027] A high-pressure pump is externally connected to the end of the first solution inlet 10. The high-pressure pump acts on the first solution to increase its pressure to meet 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 sides of the solution, the pressure required to overcome during differential pressure reverse osmosis is smaller, the additional pressurization pressure is reduced, and the energy consumption is reduced.

[0028] Folded flow channels 9 are engraved on the filter plates 4. The folded flow channels 9 are three-channel flow channels, and the depth of the folded flow channels 9 is 3-5 mm. The purpose of setting the folded flow channels 9 and the flow channel depth is to make the first solution and the second solution evenly distributed on both sides of the reverse osmosis membrane 5, and then carry out sufficient differential pressure reverse osmosis to avoid the solution flowing too fast and not having time to penetrate.

[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 compression bolt 16 is installed at the water outlet 42 of the filter plate 4, and the matching compression nut fixes the reverse osmosis membrane 5 and the grid 6 to isolate the first and second solution channels 15. The plate frame 1 is provided with an avoidance groove 17 at the corresponding position of the compression bolt 16 to prevent interference between the plate frame 1 and the compression bolt 16, and also ensure that the two plate frames 1 can compress and fix the middle osmosis membrane unit 3 to ensure tightness.

[0030] In this differential pressure reverse osmosis wastewater concentration device, the first solution channel 14 and the second solution channel 15 which are independent of each other are formed by alternately arranging the plate frames 1 and the osmosis membrane units 3 at intervals. The first solution and the second solution of the same solute with the same / different concentrations respectively flow through the concentration device through the first solution channel 14 and the second solution channel 15. During the flow process, due to the pressure difference between the two solutions, the solvent in the first solution passes through the reverse osmosis membrane 5 to the other side, realizing the concentration of the first solution. Compared with the traditional reverse osmosis system, the independent first solution channel 14 and second solution channel 15 in this wastewater concentration device allow the two solutions to flow simultaneously, realizing the differential pressure reverse osmosis technology, filling the market gap and technical gap of the differential pressure reverse osmosis device, and being beneficial to promoting the wide application of the differential pressure reverse osmosis technology in the field of wastewater treatment.

[0031] Example 2

[0032] The difference between this example and Example 1 is that in this example, the water inlet 41 and the water outlet 42 on the filter plate 4 are not arranged axially, but radially, distributed on the circumference of the filter plate 4. Then, by setting connecting pipes outside the filter plate 4, the corresponding water inlets 41 / water outlets 42 in adjacent two osmosis membrane units 3 are connected, so that the first solution channel 14 and the second solution channel 15 are independent and unobstructed. Compared with Example 1, arranging the water inlets 41 and water outlets 42 radially on the filter plate 4 makes the tightness between the filter plate 4 and the reverse osmosis membrane 5 in the osmosis membrane unit 3 better, but the thickness of the filter plate 4 will increase, and the connecting pipes outside will make the overall space occupied by the device larger; therefore, in actual application, the setting method of the water inlets 41 and water outlets 42 in the filter plate 4 can be selected according to specific process requirements.

[0033] The above are only the embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics known in the solutions are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. A multi-channel differential pressure reverse osmosis wastewater concentration device, characterized in that: It includes multiple multilayer permeable membrane units and a clamping assembly for clamping the permeable membrane units; the permeable 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 flow channels are provided on both sides, through which a first solution and a second solution flow respectively. Water inlets and outlets are opened on the filter plates on both sides of the reverse osmosis membrane. The water inlets, outlets and flow channels on the same side of the reverse osmosis membrane in each permeable 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 it is not less than that of the second solution.

2. The multi-channel differential pressure reverse osmosis wastewater concentration equipment according to claim 1, wherein: The flowing directions of the first solution and the second solution on both sides of the reverse osmosis membrane are the same.

3. The multi-channel differential pressure reverse osmosis wastewater concentration device according to claim 2, characterized in that: Folding flow channels are engraved on the filter plate, and the folding flow channels 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 folding flow channels is 3 - 5 mm.

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

6. The multi-channel differential pressure reverse osmosis wastewater concentration equipment according to claim 5, characterized in that: A compression bolt is installed at the water outlet of the filter plate, and the matching compression nut fixes the reverse osmosis membrane and the grid to separate 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 plate frames on both sides of the permeable membrane unit, and avoidance grooves for avoiding the compression bolts are opened on the plate frames.

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

Images