Water purification apparatus and system

Abstract

This utility model relates to the field of water purification technology, specifically to a water purification device and system. The utility model includes: a quartz sand filter, an activated carbon filter, a precision filter, a high-pressure pump, and a reverse osmosis membrane module. A raw water pump is installed at the inlet of the quartz sand filter. The outlet of the quartz sand filter passes through the activated carbon filter and the precision filter, and is connected to the inlet of the high-pressure pump. The outlet of the high-pressure pump is connected to the inlet of the reverse osmosis membrane module. The water purification device and system provided by this utility model adopts a multi-stage filtration pretreatment combined with a single-stage reverse osmosis desalination technology: the raw water successively passes through the raw water pump pressurization, quartz sand media filter, activated carbon filter, and precision filter pretreatment units, removing suspended impurities, silt, organic matter, etc., in the water step by step. Then, the high-pressure pump pressurizes the water before it enters the reverse osmosis membrane module for desalination, separating and producing clean water and concentrated brine. The treated purified water can be supplied to the nursery sprinkler / drip irrigation system through a pipeline network.

Description

Technical Field

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

[0002] In areas with scarce freshwater resources and severe soil salinization, natural rivers and lakes have high salt and alkali content, making them unsuitable for direct use in irrigation. The existence of saline-alkali land brings multiple problems, the most immediate being limited plant growth. Most crops cannot thrive in high-salt environments, directly leading to low crop yields and impacting local food security and economic development. Furthermore, saline-alkali land easily causes soil structure deterioration, increasing soil compaction, reducing water permeability and air circulation, further inhibiting root development, reducing vegetation cover, and accelerating desertification. For these regions, finding effective solutions to improve saline-alkali land is particularly important. Because local natural water bodies contain high levels of salt and alkali, traditional methods cannot effectively utilize these water resources for irrigation. Therefore, there is an urgent need to develop specialized purification equipment for saline-alkali water to reduce the salt concentration to a level suitable for agricultural irrigation, thereby making full use of limited water resources. The development of this equipment can provide technical support for improving saline-alkali land. By converting saline-alkali water that was originally unsuitable into usable water sources, it can not only help alleviate the pressure of water shortage, but also make it possible to develop sustainable agriculture. In turn, it has an undeniable importance for promoting regional economy, ecological balance and social stability. Utility Model Content

[0003] The purpose of this invention is to solve the problem of insufficient irrigation water in areas with scarce freshwater resources and severe soil salinization, and to provide a water purification device and system.

[0004] In a first aspect, this utility model provides a water purification device, comprising: a quartz sand filter, an activated carbon filter, a precision filter, a high-pressure pump, and a reverse osmosis membrane module. A raw water pump is installed at the inlet of the quartz sand filter. The outlet of the quartz sand filter is connected to the inlet of the activated carbon filter via a pipe. The outlet of the activated carbon filter is connected to the inlet of the precision filter via a pipe. The outlet of the precision filter is connected to the inlet of the high-pressure pump via a pipe. The outlet of the high-pressure pump is connected to the inlet of the reverse osmosis membrane module via a pipe.

[0005] According to a preferred embodiment, the reverse osmosis membrane module includes a plurality of reverse osmosis membranes. Each reverse osmosis membrane includes an inlet, a pure water outlet, and a wastewater outlet. The plurality of reverse osmosis membranes are arranged with intervals between them. The inlets of the plurality of reverse osmosis membranes are connected to the outlet of the high-pressure pump via pipes. The pure water outlets of the plurality of reverse osmosis membranes are connected to a water collection port via pipes. The wastewater outlets of the plurality of reverse osmosis membranes are connected to a wastewater outlet via pipes.

[0006] According to a preferred embodiment, the system further includes a water intake pump and a raw water tank located at the saline-alkali water source. The raw water tank is equipped with a first level gauge. The outlet of the water intake pump is connected to the inlet of the raw water tank via a pipe. An inlet solenoid valve is installed at the inlet of the raw water tank. The inlet of the raw water pump is connected to the outlet of the raw water tank via a pipe. The outlet of the raw water pump is connected to the inlet of the quartz sand filter via a pipe.

[0007] According to a preferred embodiment, the system further includes a pure water tank. The pure water tank is equipped with a second level gauge.

[0008] The water collection port is connected to the inlet of the pure water tank via a pipe. A flow meter is installed at the water collection port. A conductivity meter is installed on the pipe connecting the water collection port and the inlet of the pure water tank.

[0009] According to a preferred embodiment, the system further includes a scale inhibitor dosing device. The dosing port of the scale inhibitor dosing device is connected to the inlet of the precision filter via a pipe.

[0010] This utility model also provides a water purification system, including: a multi-stage filtration unit and a reverse osmosis desalination unit. The multi-stage filtration unit and the reverse osmosis desalination unit are connected via pipelines. Preferably, the multi-stage filtration unit includes: a quartz sand filter, an activated carbon filter, and a precision filter. The reverse osmosis desalination unit includes: a high-pressure pump and a reverse osmosis membrane module. A raw water pump is installed at the inlet of the quartz sand filter. The outlet of the quartz sand filter is connected to the inlet of the activated carbon filter via a pipeline. The outlet of the activated carbon filter is connected to the inlet of the precision filter via a pipeline. The outlet of the precision filter is connected to the inlet of the high-pressure pump via a pipeline. The outlet of the high-pressure pump is connected to the inlet of the reverse osmosis membrane module via a pipeline.

[0011] According to a preferred embodiment, the reverse osmosis membrane module includes a plurality of reverse osmosis membranes. Each reverse osmosis membrane includes an inlet, a pure water outlet, and a wastewater outlet. The plurality of reverse osmosis membranes are arranged with intervals between them. The inlets of the plurality of reverse osmosis membranes are connected to the outlet of the high-pressure pump via pipes. The wastewater outlets of the plurality of reverse osmosis membranes are connected to a wastewater outlet via pipes.

[0012] According to a preferred embodiment, the system further includes a raw water supply unit. The raw water supply unit is connected to the multi-stage filtration unit via a pipeline. The raw water supply unit includes a water intake pump located at the saline-alkali water source and a raw water tank. The raw water tank is equipped with a first level gauge. The outlet of the water intake pump is connected to the inlet of the raw water tank via a pipeline. The inlet of the raw water tank is equipped with an inlet solenoid valve. The outlet of the raw water tank is connected to the inlet of the raw water pump via a pipeline.

[0013] According to a preferred embodiment, the system further includes a product water and storage unit. The product water and storage unit is connected to the reverse osmosis desalination unit via a pipeline. The product water and storage unit includes a water collection port and a pure water tank. The pure water tank is equipped with a second level gauge. A plurality of pure water outlets from the reverse osmosis membranes are connected to the water collection port via pipelines. The water collection port is connected to the inlet of the pure water tank via a pipeline. The water collection port is equipped with a flow meter. A conductivity meter is installed on the pipeline connecting the water collection port and the inlet of the pure water tank.

[0014] According to a preferred embodiment, the system further includes a scale inhibitor dosing device and a control device. The dosing port of the scale inhibitor dosing device is connected to the inlet of the precision filter via a pipe. The control device is electrically connected to the water intake pump, the inlet solenoid valve, the first level gauge, the raw water pump, the high-pressure pump, the flow meter, the conductivity meter, the second level gauge, and the scale inhibitor dosing device.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The water purification equipment and system provided by this utility model adopts a technical solution combining multi-stage filtration pretreatment and single-stage reverse osmosis desalination: raw water successively passes through pretreatment units such as raw water pump pressurization, quartz sand media filter, activated carbon filter, and precision filter to remove suspended impurities, silt, organic matter, etc. in the water step by step. Then, it is pressurized by a high-pressure pump and enters the reverse osmosis membrane module for desalination, separating and producing clear water and concentrated brine. The treated purified water can be supplied to the nursery sprinkler / drip irrigation system through the pipeline network. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the water purification equipment involved in Example 1; Figure 2 This is a schematic diagram of the water purification equipment involved in Example 2; Figure 3 This is a schematic diagram of the unit composition of a water purification system according to a preferred embodiment of the present invention.

[0017] Marked in the image: Raw water supply unit 100, water intake pump 110, raw water tank 120, inlet solenoid valve 121, multi-stage filtration unit 200, quartz sand filter 210, raw water pump 211, activated carbon filter 220, precision filter 230, reverse osmosis desalination unit 300, high pressure pump 310, reverse osmosis membrane module 320, reverse osmosis membrane 321, product water and storage unit 400, water collection port 410, flow meter 411, conductivity meter 412, pure water tank 420, scale inhibitor dosing device 500, control device 600. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0019] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0021] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0022] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0023] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0024] Example 1 This embodiment provides a water purification device. See also... Figure 1 The water purification equipment includes: a quartz sand filter 210, an activated carbon filter 220, a precision filter 230, a high-pressure pump 310, and a reverse osmosis membrane module 320. A raw water pump 211 is installed at the inlet of the quartz sand filter 210. The outlet of the quartz sand filter 210 is connected to the inlet of the activated carbon filter 220 via a pipe. The outlet of the activated carbon filter 220 is connected to the inlet of the precision filter 230 via a pipe. The outlet of the precision filter 230 is connected to the inlet of the high-pressure pump 310 via a pipe. The outlet of the high-pressure pump 310 is connected to the inlet of the reverse osmosis membrane module 320 via a pipe.

[0025] Example 2 This embodiment is a further improvement on Embodiment 1; repeated content will not be described again. See also... Figure 2 The water purification equipment provided in this embodiment is based on the one in embodiment 1, with the addition of a water intake pump 110, a raw water tank 120, a water collection port 410, a pure water tank 420, and a scale inhibitor dosing device 500.

[0026] Preferably, the water intake pump 110 is located at the saline-alkali water source. The outlet of the water intake pump 110 is connected to the inlet of the raw water tank 120 via a pipe. Preferably, the raw water tank 120 is equipped with a first level gauge for detecting the water level in the raw water tank 120. An inlet solenoid valve 121 is installed at the inlet of the raw water tank 120. The outlet of the raw water tank 120 is connected to the inlet of the raw water pump 211 via a pipe. The outlet of the raw water pump 211 is connected to the inlet of the quartz sand filter 210 via a pipe.

[0027] Preferably, the water intake pump 110 is used to pump saline water from the saline water source to the raw water tank 120. The raw water pump 211 draws water from the raw water tank 120 and delivers it to the quartz sand filter 210 to begin purification.

[0028] Preferably, the quartz sand filter 210 is used to intercept suspended silt and sand.

[0029] Preferably, after the quartz sand filter 210 intercepts the suspended silt and sand in the saline water, the water is fed into the activated carbon filter 220 for purification.

[0030] Preferably, the activated carbon filter 220 is used to adsorb organic impurities and residual chlorine in the water.

[0031] Preferably, after the activated carbon filter 220 adsorbs organic impurities and residual chlorine in the water, the water is then fed into the precision filter 230 for purification.

[0032] Preferably, the precision filter 230 is used to further filter residual particles in the water.

[0033] Preferably, after the precision filter 230 further filters out residual particles in the water, the water is fed into the high-pressure pump 310 for pressurization.

[0034] Preferably, the high-pressure pump 310 inputs pressurized water into the reverse osmosis membrane module 320 to perform reverse osmosis filtration on the water, retaining salt ions and allowing water molecules to pass through.

[0035] Preferably, the reverse osmosis membrane module 320 includes a plurality of reverse osmosis membranes 321. Each reverse osmosis membrane 321 includes an inlet, a pure water outlet, and a wastewater outlet. The plurality of reverse osmosis membranes 321 are arranged with intervals between them. The inlets of the plurality of reverse osmosis membranes 321 are connected to the outlet of the high-pressure pump 310 via pipes. The pure water outlets of the plurality of reverse osmosis membranes 321 are connected to a water collection port 410 via pipes. The wastewater outlets of the plurality of reverse osmosis membranes 321 are connected to a concentrate outlet via pipes. Preferably, the reverse osmosis membranes 321 are RO membranes.

[0036] The water collection port 410 is connected to the inlet of the pure water tank 420 via a pipe. The water collection port 410 is equipped with a flow meter 411. A conductivity meter 412 is installed on the pipe connecting the water collection port 410 and the inlet of the pure water tank 420.

[0037] Preferably, the fresh water produced by each reverse osmosis membrane 321 in the reverse osmosis membrane module 320 is collected by the water collection port 410, and after being detected by the flow meter 411 and the conductivity meter 412, it is entered into the pure water tank 420 for storage.

[0038] Preferably, the fresh water stored in the pure water tank 420 can be supplied to the nursery sprinkler / drip irrigation system or other fresh water use points through the pipeline network.

[0039] Preferably, the pure water tank 420 is equipped with a second level gauge for detecting the water level in the pure water tank 420.

[0040] Preferably, the water purification equipment provided in this embodiment can protect the reverse osmosis membrane 321 in the reverse osmosis membrane module 320 from pollution or oxidation after the quartz sand filter 210 intercepts suspended silt and sand and the activated carbon filter 220 adsorbs organic impurities and residual chlorine in the water; after the precision filter 230 further filters the residual particles in the water, it can ensure that the turbidity and particle size of the water entering the reverse osmosis membrane module 320 meet the standards.

[0041] Preferably, the water purification equipment provided in this embodiment further includes a scale inhibitor dosing device 500. The dosing port of the scale inhibitor dosing device 500 is connected to the inlet of the precision filter 230 via a pipe. Preferably, the dosing port of the scale inhibitor dosing device 500 is connected to the water purification equipment through a pipe between the outlet of the activated carbon filter 220 and the inlet of the precision filter 230.

[0042] Preferably, the scale inhibitor dosing device 500 injects a slow-release scale inhibitor into the water purification equipment. The scale inhibitor is released in a slow-release form and forms a stable complex by combining with the scale in the water, making it easier for the precision filter 230 to capture and filter it.

[0043] Example 3 This embodiment is a further improvement based on Embodiments 1 and 2. This embodiment provides a water purification system, including: a raw water supply unit 100, a multi-stage filtration unit 200, a reverse osmosis desalination unit 300, a water production and storage unit 400, a scale inhibitor dosing device 500, and a control device 600.

[0044] The raw water supply unit 100 is connected to the multi-stage filtration unit 200 via pipelines. The multi-stage filtration unit 200 is connected to the reverse osmosis desalination unit 300 via pipelines. The product water and storage unit 400 is connected to the reverse osmosis desalination unit 300 via pipelines. The scale inhibitor dosing device 500 is connected to the multi-stage filtration unit 200 via pipelines. The control device 600 is electrically connected to the raw water supply unit 100, the multi-stage filtration unit 200, the reverse osmosis desalination unit 300, the product water and storage unit 400, and the scale inhibitor dosing device 500, respectively.

[0045] Preferably, the raw water supply unit 100 includes: a water intake pump 110 and a raw water tank 120 located at a saline-alkali water source. The raw water tank 120 is equipped with a first level gauge. The outlet of the water intake pump 110 is connected to the inlet of the raw water tank 120 via a pipe. An inlet solenoid valve 121 is installed at the inlet of the raw water tank 120. The outlet of the raw water tank 120 is connected to the inlet of the raw water pump 211 via a pipe. Preferably, the raw water supply unit 100 is used to ensure a constant supply of water to be purified.

[0046] Preferably, the multi-stage filtration unit 200 includes: a quartz sand filter 210, an activated carbon filter 220, and a precision filter 230. Preferably, the reverse osmosis desalination unit 300 includes: a high-pressure pump 310 and a reverse osmosis membrane module 320. A raw water pump 211 is installed at the inlet of the quartz sand filter 210. The outlet of the quartz sand filter 210 is connected to the inlet of the activated carbon filter 220 via a pipe. The outlet of the activated carbon filter 220 is connected to the inlet of the precision filter 230 via a pipe. The outlet of the precision filter 230 is connected to the inlet of the high-pressure pump 310 via a pipe. The outlet of the high-pressure pump 310 is connected to the inlet of the reverse osmosis membrane module 320 via a pipe. Preferably, the reverse osmosis membrane module 320 includes a plurality of reverse osmosis membranes 321. Each reverse osmosis membrane 321 includes an inlet, a pure water outlet, and a wastewater outlet. The plurality of reverse osmosis membranes 321 are arranged with intervals between them. The inlets of several reverse osmosis membranes 321 are connected to the outlet of a high-pressure pump 310 via pipes. The wastewater outlets of several reverse osmosis membranes 321 are connected to the concentrate outlet via pipes.

[0047] Preferably, the multi-stage filtration unit 200 intercepts suspended silt and sand through the quartz sand filter 210 and adsorbs organic impurities and residual chlorine in the water through the activated carbon filter 220, which can protect the reverse osmosis membrane 321 in the reverse osmosis membrane module 320 from pollution or oxidation; after the precision filter 230 further filters the residual particles in the water, it can ensure that the turbidity and particle size of the water entering the reverse osmosis membrane module 320 meet the standards.

[0048] Preferably, the reverse osmosis desalination unit 300 performs reverse osmosis filtration on water, retaining salt ions and allowing water molecules to pass through, thereby obtaining fresh water.

[0049] Preferably, the water production and storage unit 400 includes a water collection port 410 and a pure water tank 420. The pure water tank 420 is equipped with a second level gauge. The pure water outlets of several reverse osmosis membranes 321 are connected to the water collection port 410 via pipes. The water collection port 410 is connected to the inlet of the pure water tank 420 via pipes. The water collection port 410 is equipped with a flow meter 411. A conductivity meter 412 is installed on the pipe connecting the water collection port 410 and the inlet of the pure water tank 420.

[0050] Preferably, the water production and storage unit 400 collects the fresh water produced by the reverse osmosis desalination unit 300, and after being detected by the flow meter 411 and the conductivity meter 412, it is fed into the pure water tank 420 for temporary storage, and then transported to various fresh water use points for irrigation operations such as sprinkler irrigation and drip irrigation.

[0051] Preferably, the dosing port of the scale inhibitor dosing device 500 is connected to the inlet of the precision filter 230 via a pipe. Preferably, the scale inhibitor dosing device 500 injects a slow-release scale inhibitor into the water purification equipment. The scale inhibitor is released in a slow-release form and combines with the scale in the water to form a stable complex, preventing the adhesion and accumulation of scale and protecting the water purification equipment.

[0052] Preferably, the control device 600 is electrically connected to the water intake pump 110, the water inlet solenoid valve 121, the first level gauge, the raw water pump 211, the high pressure pump 310, the flow meter 411, the conductivity meter 412, the second level gauge, and the scale inhibitor dosing device 500.

[0053] Preferably, the control device 600 is capable of: obtaining the water level of the raw water tank 120 through the first level gauge; obtaining the freshwater output of the purification equipment through the flow meter 411; obtaining the effluent quality of the purification equipment through the conductivity meter 412; obtaining the water level of the pure water tank 420 through the second level gauge; and obtaining the status parameters of the water purification equipment through other sensors.

[0054] Preferably, the control device 600 is also capable of: controlling the start and stop of the water intake pump 110, the raw water pump 211, and the high-pressure pump 310; controlling the opening and closing of the water inlet solenoid valve 121; controlling the administration of the scale inhibitor dosing device 500; and controlling the working status of other functional equipment.

[0055] Preferably, the control device 600 uses data processing modules such as computers, PLCs, and microcontrollers to acquire parameters such as flow rate, pressure, conductivity, and water level of the water purification equipment, and to perform real-time regulation of valves, water pumps, scale inhibitor dosing devices 500, etc., to ensure that the quality and output of the effluent meet the set values.

[0056] Preferably, when the pure water tank 420 is full or the raw water supply is insufficient, the system will automatically shut down and standby; once the water supply is restored or the raw water pressure is normal, it can automatically start running again.

[0057] Preferably, the water purification equipment provided in this embodiment can continuously and stably produce water in areas with scarce freshwater resources and severe soil salinization, providing high-quality and sufficient irrigation water.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water purification device, characterized in that, include: Quartz sand filter (210), activated carbon filter (220), precision filter (230), high pressure pump (310) and reverse osmosis membrane module (320); The quartz sand filter (210) is equipped with a raw water pump (211) at its inlet. The outlet of the quartz sand filter (210) is connected to the inlet of the activated carbon filter (220) via a pipe; The outlet of the activated carbon filter (220) is connected to the inlet of the precision filter (230) via a pipe; The outlet of the precision filter (230) is connected to the inlet of the high-pressure pump (310) via a pipe; The outlet of the high-pressure pump (310) is connected to the inlet of the reverse osmosis membrane module (320) via a pipe.

2. A water purification apparatus according to claim 1, wherein The reverse osmosis membrane module (320) includes a plurality of reverse osmosis membranes (321); the reverse osmosis membranes (321) include an inlet, a pure water outlet, and a wastewater outlet; The reverse osmosis membranes (321) are arranged with intervals between them; The inlets of several of the reverse osmosis membranes (321) are connected to the outlet of the high-pressure pump (310) via pipes; The pure water outlets of several of the reverse osmosis membranes (321) are connected to the water collection port (410) via pipes. The wastewater outlets of several of the reverse osmosis membranes (321) are connected to the concentrate outlets via pipes.

3. A water purification apparatus according to claim 2, wherein It also includes a water intake pump (110) and a raw water tank (120) installed at the saline water source. The raw water tank (120) is equipped with a first level gauge; The outlet of the water pump (110) is connected to the inlet of the raw water tank (120) via a pipe; The inlet of the raw water tank (120) is equipped with an inlet solenoid valve (121). The inlet of the raw water pump (211) is connected to the outlet of the raw water tank (120) via a pipe; The outlet of the raw water pump (211) is connected to the inlet of the quartz sand filter (210) via a pipe.

4. A water purification apparatus according to claim 3, wherein It also includes a pure water tank (420); The pure water tank (420) is equipped with a second level gauge; The water collection port (410) is connected to the water inlet of the pure water tank (420) via a pipe; The water inlet (410) is equipped with a flow meter (411); A conductivity meter (412) is installed on the pipeline connecting the water collection port (410) and the water inlet of the pure water tank (420).

5. A water purification apparatus according to claim 4, wherein It also includes a scale inhibitor dosing device (500); The dosing port of the scale inhibitor dosing device (500) is connected to the inlet of the precision filter (230) via a pipe.

6. A water purification system characterized by, include: Multi-stage filtration unit (200) and reverse osmosis desalination unit (300); The multi-stage filtration unit (200) and the reverse osmosis desalination unit (300) are connected by pipes; The multi-stage filtration unit (200) includes: a quartz sand filter (210), an activated carbon filter (220), and a precision filter (230). The reverse osmosis desalination unit (300) includes: a high-pressure pump (310) and a reverse osmosis membrane module (320). The quartz sand filter (210) is equipped with a raw water pump (211) at its inlet. The outlet of the quartz sand filter (210) is connected to the inlet of the activated carbon filter (220) via a pipe; The outlet of the activated carbon filter (220) is connected to the inlet of the precision filter (230) via a pipe; The outlet of the precision filter (230) is connected to the inlet of the high-pressure pump (310) via a pipe; The outlet of the high-pressure pump (310) is connected to the inlet of the reverse osmosis membrane module (320) via a pipe.

7. A water purification system according to claim 6, wherein The reverse osmosis membrane module (320) includes a plurality of reverse osmosis membranes (321); the reverse osmosis membranes (321) include an inlet, a pure water outlet, and a wastewater outlet; The reverse osmosis membranes (321) are arranged with intervals between them; The inlets of several of the reverse osmosis membranes (321) are connected to the outlet of the high-pressure pump (310) via pipes; The wastewater outlets of several of the reverse osmosis membranes (321) are connected to the concentrate outlets via pipes.

8. A water purification system according to claim 7, wherein It also includes a raw water supply unit (100); the raw water supply unit (100) and the multi-stage filtration unit (200) are connected by a pipeline; The raw water supply unit (100) includes: a water intake pump (110) and a raw water tank (120) installed at the saline-alkali water source. The raw water tank (120) is equipped with a first level gauge; The outlet of the water pump (110) is connected to the inlet of the raw water tank (120) via a pipe; The inlet of the raw water tank (120) is equipped with an inlet solenoid valve (121). The outlet of the raw water tank (120) is connected to the inlet of the raw water pump (211) via a pipe.

9. A water purification system according to claim 8, wherein, It also includes a water production and storage unit (400); the water production and storage unit (400) is connected to the reverse osmosis desalination unit (300) via a pipeline; The water production and storage unit (400) includes: a water inlet (410) and a pure water tank (420). The pure water tank (420) is equipped with a second level gauge; The pure water outlets of several of the reverse osmosis membranes (321) are connected to the water collection port (410) via pipes. The water collection port (410) is connected to the water inlet of the pure water tank (420) via a pipe; The water inlet (410) is equipped with a flow meter (411); A conductivity meter (412) is installed on the pipeline connecting the water collection port (410) and the water inlet of the pure water tank (420).

10. A water purification system according to claim 9, wherein, It also includes a scale inhibitor dosing device (500) and a control device (600); The dosing port of the scale inhibitor dosing device (500) is connected to the inlet of the precision filter (230) via a pipe; The control device (600) is electrically connected to the water intake pump (110), the water inlet solenoid valve (121), the first level gauge, the raw water pump (211), the high pressure pump (310), the flow meter (411), the conductivity meter (412), the second level gauge, and the scale inhibitor dosing device (500).

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