Reverse osmosis membrane concentration system

Abstract

The utility model relates to the technical field of wastewater treatment, and provides a reverse osmosis membrane concentration system. The system comprises a high-pressure pump, a circulating pump, a reverse osmosis membrane, a conductivity probe and a water regulating valve, the inlet end of the high-pressure pump is connected with a reverse osmosis water inlet pipeline, the inlet end of the circulating pump is connected with the outlet end of the high-pressure pump and a reverse osmosis membrane concentrated water outlet pipeline, and the water inlet end of the reverse osmosis membrane is connected with the outlet end of the circulating pump; the water outlet end of the concentrated water side of the reverse osmosis membrane is connected with a concentrated water outlet pipeline of the reverse osmosis membrane, a conductivity monitoring circulation pipeline is led out of the concentrated water outlet pipeline of the reverse osmosis membrane, the conductivity monitoring circulation pipeline is connected with a conductivity probe, and a water quantity regulating valve is arranged in front of the concentrated water outlet pipeline of the reverse osmosis membrane. By adopting the system, when the conductivity of the concentrated water side of the reverse osmosis membrane is monitored to be smaller than a conductivity set value in real time through the conductivity probe, the opening degree of the water regulating valve is controlled to be reduced, so that the conductivity of the concentrated water side of the reverse osmosis membrane is increased, the utilization rate of the reverse osmosis membrane is fully exerted, and the investment and operation energy consumption of evaporation equipment are saved.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and particularly to a reverse osmosis membrane concentration system. Background Art

[0002] Industrial wastewater can be treated using reverse osmosis membrane concentration technology. In the process of industrial wastewater treatment, the requirements for zero discharge and near-zero discharge are increasing day by day. However, the salt content of the industrial wastewater inlet varies greatly. At present, the reverse osmosis membrane concentration equipment cannot well cope with the working conditions of the changing salt content of the inlet water, and cannot give full play to the utilization rate of the reverse osmosis membrane, resulting in the concentration of the water entering the backend evaporation equipment not being low enough, wasting energy. Summary of the Utility Model

[0003] Based on this, in view of the above technical problems, it is necessary to provide a reverse osmosis membrane concentration system.

[0004] In a first aspect, this application provides a reverse osmosis membrane concentration system, including:

[0005] A high-pressure pump, the inlet end of the high-pressure pump is connected to the reverse osmosis inlet pipeline;

[0006] A circulation pump, the inlet end of the circulation pump is connected to the outlet end of the high-pressure pump and the reverse osmosis membrane concentrated water outlet pipeline;

[0007] A reverse osmosis membrane, the water inlet end of the reverse osmosis membrane is connected to the outlet end of the circulation pump, the outlet end of the concentrated water side of the reverse osmosis membrane is connected to the reverse osmosis membrane concentrated water outlet pipeline, and a conductivity monitoring circulation pipeline is led out from the reverse osmosis membrane concentrated water outlet pipeline;

[0008] The conductivity monitoring circulation pipeline is connected to a conductivity probe, and the conductivity probe is used to monitor the conductivity of the concentrated water side of the reverse osmosis membrane;

[0009] A water volume regulating valve, which is arranged before the reverse osmosis concentrated water outlet pipeline; when the opening degree of the water volume regulating valve becomes smaller, the conductivity of the concentrated water side of the reverse osmosis membrane increases.

[0010] In one embodiment, the reverse osmosis inlet pipeline is used to receive high-salt wastewater.

[0011] In one embodiment, the high-pressure pump is used to increase the pressure of the water discharged from the high-pressure pump.

[0012] In one embodiment, the circulation pump is used to increase the pressure of the water entering the reverse osmosis membrane.

[0013] In one embodiment, the outlet end of the water production side of the reverse osmosis membrane is connected to the reverse osmosis water production pipeline.

[0014] In one embodiment, the other end of the conductivity monitoring flow-through pipeline led out from the reverse osmosis membrane concentrated water outlet pipeline is connected to the inlet end of the high-pressure pump.

[0015] In one embodiment, at the initial stage of the operation of the reverse osmosis membrane concentration system, the water volume regulating valve is fully open.

[0016] In one embodiment, during the operation of the reverse osmosis membrane concentration system, the opening of the water volume regulating valve gradually becomes smaller until the conductivity of the concentrated water side of the reverse osmosis membrane monitored by the conductivity probe reaches the set conductivity value.

[0017] In one embodiment, the diameter of the conductivity monitoring flow-through pipeline is smaller than the diameter of the reverse osmosis membrane concentrated water outlet pipeline.

[0018] In one embodiment, the water volume regulating valve includes a servo motor control valve.

[0019] The above reverse osmosis membrane concentration system includes a high-pressure pump, a circulation pump, a reverse osmosis membrane, a conductivity probe, and a water volume regulating valve. The inlet end of the high-pressure pump is connected to the reverse osmosis inlet pipeline. The inlet end of the circulation pump is connected to the outlet end of the high-pressure pump and the reverse osmosis membrane concentrated water outlet pipeline. The water inlet end of the reverse osmosis membrane is connected to the outlet end of the circulation pump. The water outlet end on the concentrated water side of the reverse osmosis membrane is connected to the reverse osmosis membrane concentrated water outlet pipeline, and a conductivity monitoring flow-through pipeline is led out from the reverse osmosis membrane concentrated water outlet pipeline. The conductivity monitoring flow-through pipeline is connected to the conductivity probe. The conductivity probe is used to monitor the conductivity of the concentrated water side of the reverse osmosis membrane. The water volume regulating valve is arranged before the reverse osmosis concentrated water outlet pipeline. When the opening of the water volume regulating valve becomes smaller, the conductivity of the concentrated water side of the reverse osmosis membrane increases. Affected by the salt content of the reverse osmosis inlet pipeline, when the conductivity probe monitors in real time that the conductivity of the concentrated water side of the reverse osmosis membrane is less than the set conductivity value, the opening of the water volume regulating valve is controlled to become smaller, and the water volume flowing to the reverse osmosis concentrated water outlet pipeline becomes smaller, so that the conductivity of the concentrated water side of the reverse osmosis membrane increases, giving full play to the utilization rate of the reverse osmosis membrane and saving the investment in evaporation equipment and operating energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of a reverse osmosis membrane concentration system in an embodiment;

[0022] Figure 2Schematic diagram of the connection between the water outlet end on the water production side of the reverse osmosis membrane and the reverse osmosis water production pipeline in an embodiment;

[0023] Figure 3 Schematic diagram of the connection between the other end of the conductivity monitoring flow pipeline and the inlet end of the high-pressure pump in an embodiment;

[0024] Figure 4 Schematic diagram of the structure of the reverse osmosis membrane concentration system in another embodiment. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprising", "including" or "having" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0028] Referring to "embodiment" in this application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in this application may be combined with other embodiments.

[0029] In one of the embodiments, as Figure 1 shown, the reverse osmosis membrane concentration system includes a high-pressure pump, a circulation pump, a reverse osmosis membrane, a conductivity probe and a water volume regulating valve.

[0030] Among them, the inlet end of the high-pressure pump is connected to the reverse osmosis feed water pipeline, the inlet end of the circulation pump is connected to the outlet end of the high-pressure pump and the concentrated water outlet pipeline of the reverse osmosis membrane, the inlet end of the reverse osmosis membrane is connected to the outlet end of the circulation pump, the outlet end on the concentrated water side of the reverse osmosis membrane is connected to the concentrated water outlet pipeline of the reverse osmosis membrane, and a conductivity monitoring flow pipeline is led out from the concentrated water outlet pipeline of the reverse osmosis membrane. The conductivity monitoring flow pipeline is connected to a conductivity probe, and the conductivity probe is used to monitor the conductivity of the concentrated water side of the reverse osmosis membrane. A water flow regulating valve is arranged before the reverse osmosis concentrated water outlet pipeline; when the opening of the water flow regulating valve becomes smaller, the conductivity of the concentrated water side of the reverse osmosis membrane increases.

[0031] In a reverse osmosis membrane concentration system, the high-pressure pump is one of the very important components. The role of the high-pressure pump is to provide sufficient high pressure to overcome the osmotic pressure of the reverse osmosis membrane, so as to push the reverse osmosis feed water through the membrane for separation and concentration.

[0032] In a reverse osmosis membrane concentration system, the circulation pump is a device used to circulate and transport the solution. The role of the circulation pump is to transport the reverse osmosis concentrated water from the outlet of the reverse osmosis membrane module back to the inlet to maintain the circulating flow of the reverse osmosis concentrated water in the system. Through the operation of the circulation pump, it can ensure that the reverse osmosis concentrated water continuously flows in the reverse osmosis membrane module, improving the utilization rate and concentration efficiency of the reverse osmosis membrane.

[0033] In a reverse osmosis membrane concentration system, the reverse osmosis membrane is one of the key components. The reverse osmosis membrane has high selective permeability, allowing water molecules to pass through while retaining solutes and impurities, achieving the separation and concentration of the reverse osmosis feed water.

[0034] In a reverse osmosis membrane concentration system, the conductivity probe is an important instrument for monitoring water quality. The conductivity probe judges the change of solute concentration by measuring the conductivity of the concentrated water side of the reverse osmosis membrane, thereby monitoring the purity and concentration effect of the water in the reverse osmosis membrane system. Through the real-time monitoring of the conductivity probe, the operator can understand the change of solute concentration during the operation of the reverse osmosis membrane concentration system and adjust the operation parameters in time to ensure the normal operation and high-efficiency work of the reverse osmosis membrane concentration system.

[0035] In a reverse osmosis membrane concentration system, the water flow regulating valve is a device used to regulate the water flow rate entering the reverse osmosis concentrated water outlet pipeline. The water flow regulating valve can adjust the water flow rate and pressure according to the conductivity of the concentrated water side of the reverse osmosis membrane, and can control the flow rate of the reverse osmosis feed water in the reverse osmosis membrane module.

[0036] In the above reverse osmosis membrane concentration system, when the conductivity of the concentrated water side of the reverse osmosis membrane monitored in real time by the conductivity probe is less than the set conductivity value, the opening of the water flow regulating valve is controlled to become smaller, and the amount of water flowing to the reverse osmosis concentrated water outlet pipeline becomes less, so that the conductivity of the concentrated water side of the reverse osmosis membrane increases, giving full play to the utilization rate of the reverse osmosis membrane and saving the investment in evaporation equipment and operating energy consumption.

[0037] In one embodiment, the reverse osmosis feed water pipeline is used to receive high-salt wastewater.

[0038] In a reverse osmosis membrane concentration system, the reverse osmosis feed water pipeline is the pipeline that introduces high-salt wastewater into the system, that is, the reverse osmosis feed water pipeline is used to receive high-salt wastewater, so that the reverse osmosis membrane concentration system separates solutes and solvents from the high-salt wastewater and realizes the concentration of the high-salt wastewater.

[0039] In one embodiment, the high-pressure pump is used to increase the pressure of the water discharged from the high-pressure pump.

[0040] In a reverse osmosis membrane concentration system, the high-pressure pump can increase the pressure of the water discharged from the high-pressure pump to overcome the osmotic pressure of the reverse osmosis membrane, thereby driving the reverse osmosis feed water to pass through the reverse osmosis membrane for separation and concentration.

[0041] In one embodiment, the circulation pump is used to increase the pressure of the water entering the reverse osmosis membrane.

[0042] In a reverse osmosis membrane concentration system, the circulation pump can increase the pressure of the water entering the reverse osmosis membrane to overcome the osmotic pressure of the reverse osmosis membrane, thereby driving the reverse osmosis feed water to pass through the reverse osmosis membrane for separation and concentration.

[0043] In one embodiment, as Figure 2 shown, the outlet end of the water production side of the reverse osmosis membrane is connected to the reverse osmosis product water pipeline.

[0044] In a reverse osmosis membrane concentration system, the outlet end of the water production side of the reverse osmosis membrane can be connected to the reverse osmosis product water pipeline, and the solvent such as fresh water is discharged from the reverse osmosis membrane concentration system through the reverse osmosis product water pipeline.

[0045] In one embodiment, as Figure 3 shown, the other end of the conductivity monitoring flow-through pipeline led out from the reverse osmosis membrane concentrated water outlet pipeline is connected to the inlet end of the high-pressure pump.

[0046] In a reverse osmosis membrane concentration system, the other end of the conductivity monitoring flow-through pipeline led out from the reverse osmosis membrane concentrated water outlet pipeline can be connected to the inlet end of the high-pressure pump, and the solution in the conductivity monitoring flow-through pipeline can be transported from the outlet of the reverse osmosis membrane module back to the inlet to keep the solution in the system circulating and avoid wasting the solution.

[0047] In one embodiment, at the initial stage of the operation of the reverse osmosis membrane concentration system, the water flow regulating valve is fully open.

[0048] At the initial stage of the operation of the reverse osmosis membrane concentration system, the water flow regulating valve is fully open, which is convenient for subsequent adjustment of the water flow rate entering the reverse osmosis concentrated water outlet pipeline.

[0049] In one embodiment, during the operation of the reverse osmosis membrane concentration system, the opening degree of the water volume regulating valve gradually decreases until the conductivity of the concentrated water side of the reverse osmosis membrane monitored by the conductivity probe reaches the conductivity set value.

[0050] During the operation of the reverse osmosis membrane concentration system, the opening degree of the water volume regulating valve gradually decreases, reducing the water flow rate entering the reverse osmosis concentrated water outlet pipeline, making the pressure on the concentrated water side of the reverse osmosis membrane higher, accelerating the flow rate of fresh water in the reverse osmosis membrane module, increasing the conductivity of the concentrated water side of the reverse osmosis membrane, until the conductivity of the concentrated water side of the reverse osmosis membrane monitored by the conductivity probe reaches the conductivity set value, where the conductivity set value can be the allowable limit value of the concentrated water side of the reverse osmosis membrane.

[0051] In one embodiment, the diameter of the conductivity monitoring flow pipeline is smaller than the diameter of the reverse osmosis membrane concentrated water outlet pipeline.

[0052] In the reverse osmosis membrane concentration system, the purpose of leading out the conductivity monitoring flow pipeline from the reverse osmosis membrane concentrated water outlet pipeline is to be able to monitor the conductivity of the concentrated water side of the reverse osmosis membrane in real time through the conductivity probe in the conductivity monitoring flow pipeline. Therefore, the diameter of the conductivity monitoring flow pipeline can be set smaller than the diameter of the reverse osmosis membrane concentrated water outlet pipeline, so that most of the reverse osmosis membrane concentrated water is transported back from the outlet of the reverse osmosis membrane module to the inlet, maintaining the circulating flow of the reverse osmosis membrane concentrated water in the system, improving the utilization rate and concentration efficiency of the reverse osmosis membrane, while a small part of the reverse osmosis membrane concentrated water flows into the conductivity monitoring flow pipeline to monitor the conductivity of the concentrated water side of the reverse osmosis membrane in real time.

[0053] In one embodiment, the water volume regulating valve includes a servo motor control valve.

[0054] The servo motor control valve is a device used to regulate the flow rate, pressure or liquid level of a fluid (liquid or gas). The servo motor control valve controls the movement of the servo motor to change the opening degree of the valve, thereby achieving precise regulation of the fluid flow rate.

[0055] In the reverse osmosis membrane concentration system of this embodiment, the servo motor control valve can be used as the water volume regulating valve to regulate the water flow rate entering the reverse osmosis concentrated water outlet pipeline.

[0056] To better understand the above system, the following details an application embodiment of the reverse osmosis membrane concentration system of this application, as Figure 4 shown.

[0057] The inlet end of the high-pressure pump is connected to the reverse osmosis feed water pipeline, and the reverse osmosis feed water enters the high-pressure pump through the reverse osmosis feed water pipeline; the inlet end of the circulation pump is connected to the outlet end of the high-pressure pump and the reverse osmosis membrane concentrated water outlet pipeline. After the reverse osmosis feed water is boosted by the high-pressure pump, it converges with the concentrated water in the reverse osmosis membrane concentrated water outlet pipeline and then enters the inlet end of the circulation pump; after the converged water is boosted by the circulation pump, it enters the concentrated water side of the reverse osmosis membrane through the reverse osmosis membrane feed water pipeline. Driven by the high-pressure difference between the concentrated water side and the water production side of the reverse osmosis membrane, salts in the reverse osmosis feed water, such as in high-salt wastewater, are retained on the concentrated water side; the outlet end of the water production side of the reverse osmosis membrane can be connected to the reverse osmosis product water pipeline, and the water filtered by the reverse osmosis membrane can be discharged from the reverse osmosis membrane concentrated water system through the reverse osmosis membrane product water pipeline. The outlet end of the concentrated water side of the reverse osmosis membrane is connected to the reverse osmosis membrane concentrated water outlet pipeline, and the reverse osmosis membrane concentrated water outlet pipeline is connected to the reverse osmosis concentrated water outlet pipeline. Before the connection point of the reverse osmosis membrane concentrated water outlet pipeline and the reverse osmosis concentrated water outlet pipeline, a conductivity monitoring flow-through pipeline is led out. The other end of the conductivity monitoring flow-through pipeline is connected to the inlet end of the high-pressure pump (high-pressure pump inlet pipeline), and the solution in the conductivity monitoring flow-through pipeline can be transported from the outlet of the reverse osmosis membrane module back to the inlet, maintaining the circulating flow of the solution in the system and avoiding waste of the solution; a conductivity probe is arranged in the middle pipe section of the conductivity monitoring flow-through pipeline for monitoring the conductivity of the concentrated water side of the reverse osmosis membrane. A water flow regulating valve (which can be a servo motor control valve) is arranged before the reverse osmosis concentrated water outlet pipeline for regulating the water flow rate entering the reverse osmosis concentrated water outlet pipeline.

[0058] At the initial stage of the operation of the reverse osmosis membrane concentration system, the water flow regulating valve is fully open. During the subsequent operation process, the water flow regulating valve and the conductivity probe are interlocked to control the conductivity of the concentrated water side of the reverse osmosis membrane. Specifically, the conductivity of the concentrated water side of the reverse osmosis membrane can be monitored in real time through the conductivity probe, and according to the conductivity of the concentrated water side of the reverse osmosis membrane monitored in real time by the conductivity probe, the opening degree of the water flow regulating valve is controlled to control the water volume flowing into the reverse osmosis concentrated water outlet pipeline, thereby controlling the conductivity of the concentrated water side.

[0059] During the operation of the reverse osmosis membrane concentration system, the opening degree of the water flow regulating valve gradually decreases until the conductivity of the concentrated water side of the reverse osmosis membrane monitored by the conductivity probe reaches the conductivity set value. During this process, a small amount of concentrated water is discharged from the system. After the conductivity of the concentrated water side of the reverse osmosis membrane reaches the conductivity set value, even if the salt content of the inlet water changes, the conductivity control value of the concentrated water side remains unchanged, which can ensure that the reverse osmosis concentrated water volume is always minimized, giving full play to the utilization rate of the reverse osmosis membrane and saving the investment in evaporation equipment and operation energy consumption.

[0060] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0061] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A reverse osmosis membrane concentration system, characterized in that: include: A high-pressure pump, the inlet end of which is connected to the reverse osmosis water inlet pipeline; A circulation pump, the inlet end of the circulation pump is connected to the outlet end of the high-pressure pump and the concentrated water outlet pipeline of the reverse osmosis membrane; A reverse osmosis membrane, wherein the water inlet of the reverse osmosis membrane is connected to the outlet of a circulation pump, the water outlet of the concentrated water side of the reverse osmosis membrane is connected to the concentrated water outlet pipeline of the reverse osmosis membrane, and a conductivity monitoring circulation pipeline is led out from the concentrated water outlet pipeline of the reverse osmosis membrane; The conductivity monitoring circulation pipeline is connected to a conductivity probe, and the conductivity probe is used to monitor the conductivity of the concentrated water side of the reverse osmosis membrane; The water flow regulating valve is arranged before the reverse osmosis concentrated water outlet pipeline; when the opening of the water flow regulating valve becomes smaller, the conductivity of the concentrated water side of the reverse osmosis membrane increases.

2. The system according to claim 1, characterized in that The conductivity probe is arranged in the middle pipeline section of the conductivity monitoring circulation pipeline.

3. The system according to claim 1, characterized in that The reverse osmosis membrane concentrated water outlet pipeline is connected to the reverse osmosis concentrated water outlet pipeline.

4. The system according to claim 3, characterized in that The conductivity monitoring flow pipeline is led out before the connection point between the reverse osmosis membrane concentrated water outlet pipeline and the reverse osmosis concentrated water outlet pipeline.

5. The system according to claim 1, characterized in that The water outlet end of the water production side of the reverse osmosis membrane is connected to the reverse osmosis water production pipeline.

6. The system according to claim 1, characterized in that The other end of the conductivity monitoring circulation pipeline led out from the reverse osmosis membrane concentrated water outlet pipeline is connected to the inlet end of the high-pressure pump.

7. The system according to claim 1, characterized in that At the beginning of the operation of the reverse osmosis membrane concentration system, the water flow regulating valve is fully opened.

8. The system according to claim 1, characterized in that During the operation of the reverse osmosis membrane concentration system, the opening of the water flow regulating valve gradually decreases until the conductivity of the concentrated water side of the reverse osmosis membrane monitored by the conductivity probe reaches a conductivity setting value.

9. The system according to claim 1, characterized in that The diameter of the conductivity monitoring circulation pipeline is smaller than the diameter of the reverse osmosis membrane concentrated water outlet pipeline.

10. The system according to any one of claims 1 to 9, characterized in that: The water flow regulating valve comprises a servo motor controlled valve.

Images