A reverse osmosis water purification system

Abstract

The utility model relates to water treatment technical field. The utility model discloses a kind of reverse osmosis water quality purification systems, including pretreatment unit, RO booster pump, RO filter membrane. The utility model is installed with concentrated water recovery device between concentrated water outlet and raw water inlet, the concentrated water recovery device includes pressure exchanger and closed water tank, the pressure exchanger is connected to concentrated water outlet by concentrated water recovery pipeline, high-pressure concentrated water pressure is exchanged with low-pressure raw water by the pressure exchanger, improve low-pressure raw water pressure, the low-pressure concentrated water of the pressure exchanger output flows into closed water tank storage, the low-pressure concentrated water of closed water tank storage reaches set pressure and inputs raw water pipeline. The technical scheme of the utility model can reduce the power consumption of RO booster pump about 70%, water-saving efficiency can reach about 20%, obvious energy-saving emission-reducing effect is saved.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a water purification system, specifically a reverse osmosis water purification system. Background Technology

[0002] Water treatment technology is widely used in various fields such as seawater desalination, medical water purification, and wastewater treatment. In recent years, with the development of filtration membrane technology, reverse osmosis (RO) water treatment technology has been widely adopted in water treatment.

[0003] A two-stage RO+EDI (Electrodeionization) purified water preparation device widely used in medical water purification systems, with the structure as follows: Figure 1 As shown, the system mainly consists of a pretreatment unit, a primary RO system (including an RO booster pump and an RO filter membrane), a secondary RO system (not shown in the diagram), and an EDI module (not shown in the diagram) connected in series. Of course, necessary pneumatic butterfly valves, check valves, and other components are also installed on the relevant pipelines. This purified water treatment system works by achieving water purification through a step-by-step process of "coarse filtration - fine filtration - deep desalination." The pretreatment unit includes a multi-media filter, a softener, an activated carbon filter, and a security filter. It first removes large particulate impurities, residual chlorine, and suspended solids from the raw water to prevent subsequent membrane module fouling. The low-pressure raw water treated by the pretreatment unit enters the primary RO system, where, under high pressure, it passes through the RO filter membrane, retaining approximately 95%-99% of the salt, organic matter, and microorganisms. The water then flows into the secondary RO system through the freshwater outlet to further reduce residual pollutants (such as trace organic matter and silicates), improving the purity of the effluent. The filtered water from the secondary RO system then enters the EDI module. Inside the module, the ion exchange resin adsorbs residual ions (such as sodium and chloride ions) under the influence of an electric field. Simultaneously, the electric field drives the ions to migrate to the concentrate chamber and discharge them. Furthermore, the resin can continuously desalinate without the need for acid or alkali regeneration. Finally, the EDI-treated water is piped to a distribution tank for use at the point of application.

[0004] The main problems with the above-mentioned water treatment systems are the high power consumption of the RO booster pump and the large amount of concentrate discharge, resulting in energy loss and water waste. For example, in a typical 8T / h purified water preparation system, the raw water pump power is 4KW, the first-stage RO booster pump power is 11KW, and the concentrate discharge from the first-stage RO filtration membrane is 1.8T / h when producing water, with a concentrate pressure reaching 0.85MPa. Summary of the Invention

[0005] The main purpose of this invention is to provide a reverse osmosis water purification system to solve the problems of high energy consumption and water waste in existing water treatment systems.

[0006] To achieve the above objectives, according to one aspect of a specific embodiment of this utility model, a reverse osmosis water purification system is provided, comprising a pretreatment unit, an RO booster pump, and an RO filter membrane. Low-pressure raw water, after preliminary filtration by the pretreatment unit, enters the RO booster pump via a raw water pipeline. The RO booster pump increases the pressure of the low-pressure raw water to the working pressure of the RO filter membrane. After filtration by the RO filter membrane, the raw water enters a subsequent stage for further treatment through a freshwater outlet. The high-pressure concentrate generated by filtration is discharged through a concentrate outlet. The system is characterized by a concentrate recovery device installed between the concentrate outlet and the raw water inlet. The concentrate recovery device includes a pressure exchanger and a sealed water tank. The pressure exchanger is connected to the concentrate outlet via a concentrate recovery pipeline. The pressure exchanger exchanges pressure between the high-pressure concentrate and the low-pressure raw water, increasing the pressure of the low-pressure raw water. The low-pressure concentrate output by the pressure exchanger flows into the sealed water tank for storage. After the low-pressure concentrate stored in the sealed water tank reaches a set pressure, it is input into the raw water pipeline.

[0007] In some embodiments, the pressure exchanger is a rotary pressure exchanger, which uses high-pressure concentrate to drive the rotor to rotate and transfer pressure to low-pressure raw water.

[0008] In some embodiments, the sealed water tank is a stainless steel pressure-resistant water tank.

[0009] In some embodiments, a pneumatic check valve is connected between the sealed water tank and the raw water pipeline.

[0010] In some embodiments, a manual ball valve and a pressure gauge are connected to the concentrate recovery pipeline.

[0011] According to the technical solution of this utility model and its further improved technical solutions in some exemplary embodiments, this utility model has the following beneficial effects:

[0012] The reverse osmosis water purification system of this invention is characterized by mature technology, simple and compact structure, and can reduce the power consumption of RO booster pump by about 70% and achieve a water saving efficiency of about 20%. It is very suitable for medical water purification systems and has great practical value for promotion.

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description

[0014] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The specific embodiments, illustrative examples, and descriptions of the utility model are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0015] Figure 1 This is a schematic diagram of an existing medical water purification system.

[0016] Figure 2 This is a schematic diagram of the reverse osmosis water purification system according to a specific embodiment of the present invention.

[0017] It should be noted that, unless otherwise specified, the specific embodiments, exemplary embodiments, and features thereof in this utility model can be combined with each other. This utility model will now be described in detail with reference to the accompanying drawings and the following description.

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the specific embodiments and exemplary embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described exemplary embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments and implementations obtained by those skilled in the art based on the specific embodiments and exemplary embodiments of the present invention without creative effort should fall within the protection scope of the present invention. Example

[0019] The structure of the reverse osmosis water purification system of this utility model is as follows: Figure 2 As shown, it includes a pretreatment unit, an RO booster pump, and an RO filter membrane. The low-pressure raw water, after preliminary filtration by the pretreatment unit, enters the RO booster pump through the raw water pipeline. The RO booster pump increases the pressure of the low-pressure raw water to the working pressure of the RO filter membrane. After being filtered by the RO filter membrane, the raw water enters the subsequent stage for further treatment through the fresh water outlet. The high-pressure concentrate produced by filtration is discharged through the concentrate outlet.

[0020] and Figure 1 Compared with the prior art, this utility model adds a concentrate recovery pipeline between the concentrate outlet and the raw water inlet, and installs a concentrate recovery device consisting of a pressure exchanger and a sealed water tank on the pipeline.

[0021] like Figure 2 As shown, the concentrate recovery pipeline is also equipped with manual ball valves and pressure gauges to control and monitor pipeline pressure and flow. Figure 2In this system, a pressure exchanger is connected to the concentrate outlet via a concentrate recovery pipeline. Here, the pressure exchanger exchanges pressure between the high-pressure concentrate and the low-pressure raw water, increasing the pressure of the low-pressure raw water. The low-pressure concentrate output from the pressure exchanger flows into a sealed water tank for storage. Once the low-pressure concentrate in the sealed water tank reaches a set pressure, it opens a pneumatic check valve, allowing the low-pressure concentrate to flow back into the raw water pipeline. The function of the pneumatic check valve is to prevent the low-pressure raw water from flowing back into the sealed water tank. For a purified water preparation system with a production capacity of 8T / h, a sealed water tank capacity of 200L is recommended.

[0022] This example uses a rotary pressure exchanger, which utilizes high-pressure concentrate to drive the rotor to rotate, transferring pressure to the low-pressure raw water, thereby increasing the raw water pressure and achieving pressure recovery. Because the RO booster pump has a pressure detection device, it can automatically adjust its output power according to the raw water pressure. Increased raw water pressure can reduce the RO booster pump's output power, achieving energy savings.

[0023] In this example, the closed-loop water tank is made of stainless steel pressure-resistant material, which can withstand a certain pressure and is corrosion-resistant. The low-pressure concentrated water stored in the closed-loop water tank flows back to the raw water pipeline through a pneumatic check valve, realizing the recycling of water resources.

[0024] According to actual calculations, the technical solution of this utility model can reduce the power consumption of the RO booster pump by about 70%, and the water saving efficiency can reach about 20%, resulting in significant energy saving and emission reduction effects.

Claims

1. A reverse osmosis water purification system, comprising a pretreatment unit, an RO booster pump, and an RO filter membrane. Low-pressure raw water, after preliminary filtration by the pretreatment unit, enters the RO booster pump via a raw water pipeline. The RO booster pump increases the pressure of the low-pressure raw water to the working pressure of the RO filter membrane. After filtration by the RO filter membrane, the raw water enters a subsequent stage for further treatment through a freshwater outlet. The high-pressure concentrate produced by filtration is discharged through a concentrate outlet. The system is characterized in that… A concentrate recovery device is installed between the concentrate outlet and the raw water inlet. The concentrate recovery device includes a pressure exchanger and a sealed water tank. The pressure exchanger is connected to the concentrate outlet through a concentrate recovery pipeline. The pressure exchanger exchanges pressure between the high-pressure concentrate and the low-pressure raw water to increase the pressure of the low-pressure raw water. The low-pressure concentrate output by the pressure exchanger flows into the sealed water tank for storage. After the low-pressure concentrate stored in the sealed water tank reaches the set pressure, it is input into the raw water pipeline.

2. The reverse osmosis water purification system according to claim 1, characterized in that, The pressure exchanger is a rotary pressure exchanger, which uses high-pressure concentrate to drive the rotor to rotate and transfer pressure to low-pressure raw water.

3. The reverse osmosis water purification system according to claim 1, characterized in that, The sealed water tank is made of stainless steel and is pressure resistant.

4. The reverse osmosis water purification system according to claim 1, characterized in that, A pneumatic check valve is connected between the sealed water tank and the raw water pipeline.

5. The reverse osmosis water purification system according to claim 1, characterized in that, The concentrate recovery pipeline is connected to a manual ball valve and a pressure gauge.

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