Water-saving circulating irrigation system for saline-alkali soil improvement

Abstract

The utility model provides a water-saving circulating irrigation system for improvement of saline-alkali soil, which comprises a water collecting system, a plurality of drainage ditches, a plurality of irrigation branch pipes, a plurality of irrigation branch pipes and a plurality of irrigation branch pipes, and is characterized in that the water collecting system is provided with a plurality of drainage ditches and divides the saline-alkali soil into multiple irrigation areas; the filtering system is connected with the water collecting system and is used for filtering saline-alkaline water in the drainage ditch; the electro-adsorption system is connected with the filtering system and is used for performing electro-adsorption desalination on the filtered saline-alkaline water; the water return system comprises a water storage pond, one end of the water storage pond is connected with the electro-adsorption system to receive desalted water, the other end of the water storage pond is connected with each irrigation branch pipe through a water return pipe, and the water return system conveys the desalted water to each irrigation area for irrigation; the controller is in signal connection with the water collecting system, the filtering system, the electro-adsorption system and the water returning system respectively. The water-saving circulating irrigation system for improving the saline-alkali soil solves the technical problems that in the prior art, in a traditional saline-alkali soil restoration project, water resources are wasted, saline-alkali water cannot be drained, and the irrigation cost is high.

Description

Technical Field

[0001] The utility model relates to the technical field of saline-alkali land restoration, in particular to a water-saving circulating irrigation system for saline-alkali land improvement. Background Art

[0002] Salt-alkali land is widely distributed in arid and semi-arid regions, where precipitation is scarce, water resources are scarce, and the accumulation of soil salinity significantly restricts land productivity and sustainable agricultural development.

[0003] Traditional saline-alkali land improvement methods, such as the "freshwater suppression and drainage salt wash" model, achieve soil desalination and prevent secondary salinization by establishing a robust irrigation and drainage system to store freshwater to suppress salt, flush out salt with irrigation water, drain alkaline water, and control the groundwater level below a critical depth. This method not only flushes salt from the soil but also controls soil salinization caused by rising groundwater levels. This requires sufficient water sources and good drainage outlets, combining irrigation and drainage. While this "drainage-based" approach has improved regional governance, it also presents numerous problems. These include the high cost of irrigation and drainage engineering, high investment, operating, and maintenance costs, and the need for continuous human intervention; the excessive water consumption associated with salt washing and drainage, which is detrimental to water conservation; and the contamination of downstream water sources by discharged saline-alkali water. Therefore, this method is severely constrained by the source and destination of irrigation water.

[0004] Therefore, the prior art needs to be further developed. Utility Model Content

[0005] The purpose of this utility model is to overcome the above technical deficiencies and provide a water-saving circulating irrigation system for saline-alkali land improvement, so as to solve the technical problems of water resource waste, nowhere to drain saline-alkali water and high irrigation costs existing in traditional saline-alkali land restoration projects in related technologies.

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: a water-saving circulating irrigation system for improving saline-alkali land is provided, including: a water collection system, the water collection system has a plurality of drainage ditches arranged horizontally and vertically along the saline-alkali land, dividing the saline-alkali land into several irrigation areas, and each irrigation area is provided with an irrigation branch pipe; a filtration system, the filtration system is connected to the water collection system, and filters the saline-alkali water in the drainage ditch; an electrosorption system, the electrosorption system is connected to the filtration system, and performs electrosorption desalination on the filtered saline-alkali water; a return water system, the return water system includes a water storage tank, one end of the water storage tank is connected to the electrosorption system to receive the desalinated water, and the other end is connected to each irrigation branch pipe through a return water pipe, and the return water system transports the desalinated water to each irrigation area for irrigation; a controller, the controller is respectively connected to the water collection system, the filtration system, the electrosorption system and the return water system signal.

[0007] Furthermore, the water collection system also includes a water collection pool, which is connected to each drainage ditch. The water collection pool is used to collect saline water from each drainage ditch and supply the collected saline water to the filtration system.

[0008] Furthermore, a first liquid level sensor is provided in the water collection tank, and the first liquid level sensor is used to monitor the water level in the water collection tank. The first liquid level sensor is connected to the controller signal.

[0009] Furthermore, the filtration system includes a first filter and a second filter. The water collection tank, the first filter and the second filter are connected in sequence. The saline water in the water collection tank is first preliminarily filtered by the first filter to remove particulate impurities, and then enters the second filter for precision filtration to remove molecular impurities in the water.

[0010] Furthermore, the filtration system also includes a lift pump, which is arranged between the water collection tank and the first filter. The lift pump is used to pressurize the saline water in the water collection tank and transport it to the first filter; the lift pump is connected to the controller signal.

[0011] Furthermore, the electro-adsorption system includes a raw water tank and an electro-adsorption module. The front end of the raw water tank is connected to the output end of the second filter to receive the saline water after precision filtration; the rear end of the raw water tank is connected to the input end of the electro-adsorption module to send the temporarily stored filtered water into the electro-adsorption module for desalination treatment. The output end of the electro-adsorption module is connected to the water storage tank.

[0012] Furthermore, the electro-adsorption system also includes a high-pressure pump, which is located between the raw water pool and the electro-adsorption module and is used to drive the precisely filtered saline water from the raw water pool into the electro-adsorption module; the high-pressure pump is connected to the controller signal.

[0013] Furthermore, the return water system also includes a return water pump, which is arranged between the water storage tank and the return water pipe and is used to pressurize the water in the water storage tank and transport it to the return water pipe for irrigation operations; the return water pump is connected to the controller signal.

[0014] Furthermore, a second liquid level sensor is provided in the water tank, and the second liquid level sensor is used to monitor the water level in the water tank. The second liquid level sensor is connected to the controller signal.

[0015] Furthermore, each irrigation branch pipe is provided with a first valve, and each irrigation area is provided with a humidity detector, which is used to monitor the soil moisture in each irrigation area; the controller is respectively connected to the signal of each humidity detector, and controls the opening or closing of the first valve on each irrigation branch pipe by monitoring the humidity of each irrigation area to achieve water-saving irrigation.

[0016] Beneficial effects:

[0017] 1. The saline-alkali water from the saline-alkali land is collected through a water collection system. After filtering and electro-adsorption desalination treatment, it is then used for irrigation through a return water system, thus realizing the recycling of water resources and significantly reducing the waste of water resources in traditional irrigation methods.

[0018] 2. In traditional saline-alkali land improvement methods, the treated saline-alkali water is often difficult to discharge and easily pollutes downstream water sources. However, the utility model uses an electrosorption system to desalinate the saline-alkali water, allowing the treated water to be used for irrigation, avoiding the problem of direct discharge of saline-alkali water.

[0019] 3. Through the automated control system, including controllers, liquid level sensors, humidity detectors, etc., precise control of the irrigation process is achieved, avoiding unnecessary irrigation and waste, thereby reducing irrigation costs. At the same time, due to the recycling of water resources, the dependence on fresh water sources is reduced, further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a water-saving circulating irrigation system for improving saline-alkali land adopted in an embodiment of the present utility model.

[0021] The above drawings include the following reference numerals:

[0022] 1. Water collection system; 11. Drainage ditch; 12. Irrigation area; 13. Irrigation branch pipe; 14. Water collection tank; 15. First liquid level sensor; 16. First valve; 17. Humidity detector; 2. Filtration system; 21. First filter; 22. Second filter; 23. Lifting pump; 3. Electrosorption system; 31. Raw water tank; 32. Electrosorption module; 33. High-pressure pump; 34. Buffer tank; 4. Return water system; 41. Water storage tank; 42. Return water pipe; 43. Return water pump; 44. Second liquid level sensor; 45. Second valve; 46. Water quality monitor; 5. Controller. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0024] According to the embodiment of the present invention, a water-saving circulating irrigation system for improving saline-alkali land is provided. Figure 1The system comprises a water collection system 1 having multiple drainage ditches 11 arranged in a staggered manner along the horizontal and vertical directions of the saline-alkali land, dividing the saline-alkali land into several irrigation areas 12. Each irrigation area 12 is provided with an irrigation branch pipe 13. A filtration system 2 is connected to the water collection system 1 and filters the saline-alkali water in the drainage ditches 11. An electrosorption system 3 is connected to the filtration system 2 and performs electrosorption desalination on the filtered saline-alkali water. A return water system 4 includes a reservoir 41. One end of the reservoir 41 is connected to the electrosorption system 3 to receive the desalinated water, and the other end is connected to the irrigation branch pipes 13 via a return pipe 42. The return water system 4 transports the desalinated water to each irrigation area 12 for irrigation. A controller 5 is connected to the water collection system 1, the filtration system 2, the electrosorption system 3, and the return water system 4 for signal transmission. The water collection system 1 collects the saline-alkali water from the saline-alkali land, filters it, and desalinates it through electrosorption before being used by the return water system 4 for irrigation. This recycling method significantly reduces the consumption of fresh water resources and achieves water-saving effects. At the same time, it solves the environmental problems caused by the direct discharge of saline-alkali water, making water resources more efficiently and sustainably utilized. Traditional saline-alkali land irrigation methods often require a large amount of fresh water and are accompanied by high irrigation costs. However, this system can significantly reduce irrigation costs by recycling saline-alkali water and precise irrigation control. In addition, the system can adjust the irrigation water volume and irrigation time according to actual irrigation needs through the precise control of each subsystem by the controller 5, thereby achieving precise irrigation. This not only improves irrigation efficiency but also avoids the waste of water resources. When crops are planted in the field and irrigation is required, the water in the water tank 41 is controlled by the controller 5 to flow through the return pipe 42 and the corresponding irrigation branch pipe 13 to the corresponding irrigation area 12. The water-saving recycling irrigation system for saline-alkali land improvement of this embodiment solves the technical problems of water waste, saline-alkali water having nowhere to be discharged, and high irrigation costs in traditional saline-alkali land restoration projects in the related art.

[0025] See Figure 1 In the water-saving circulating irrigation system for improving saline-alkali land of this embodiment, the water collection system 1 also includes a water collection pool 14, which is connected to each drainage ditch 11. The water collection pool 14 is used to collect the saline-alkali water from each drainage ditch 11 and supply the collected saline-alkali water to the filtration system 2. The water collection pool 14 is connected to each drainage ditch 11 and can effectively collect saline-alkali water from different areas of the saline-alkali land. The establishment of the water collection pool 14 enables the saline-alkali water to be centrally processed, avoiding the dispersion and loss of water resources. The water after filtration and electrosorption desalination treatment can be reused for irrigation, which significantly improves the utilization rate and circulation efficiency of water resources.

[0026] See Figure 1In the water-saving circulating irrigation system for improving saline-alkali land of this embodiment, a first liquid level sensor 15 is provided in the water collecting tank 14. The first liquid level sensor 15 is used to monitor the water level in the water collecting tank 14. The first liquid level sensor 15 is connected to the controller 5 by signal. The first liquid level sensor 15 can monitor the water level changes in the water collecting tank 14 in real time. Through the signal connection with the controller 5, the first liquid level sensor 15 can transmit the monitored water level data to the controller 5. The saline-alkali land plots need to be soaked before cultivation. The salt washing wastewater after soaking is collected in the water collecting tank 14 through the drainage ditch 11. When the first liquid level sensor 15 in the water collecting tank 14 reaches the preset water level, the controller 5 controls the filtration system 2 and the electrosorption system 3 to start working, and the treated desalted water is stored in the water storage tank 41.

[0027] See Figure 1 In the water-saving circulating irrigation system for improving saline-alkali land of this embodiment, the filtration system 2 includes a first filter 21 and a second filter 22. The water collection tank 14, the first filter 21 and the second filter 22 are connected in sequence. The saline-alkali water in the water collection tank 14 is first preliminarily filtered by the first filter 21 to remove particulate impurities, and then enters the second filter 22 for precision filtration to remove molecular impurities in the water. The first filter 21 can remove large particulate impurities in the water, such as mud, suspended matter, etc. The water after the preliminary filtration enters the second filter 22, which can further remove molecular impurities in the water, such as soluble organic matter, colloids, microorganisms, etc., thereby significantly improving the water purification effect. Through two-stage filtration, the impurity content entering the subsequent electrosorption system 3 can be effectively reduced, the load and wear of the electrosorption module can be reduced, and its service life can be extended.

[0028] See Figure 1 In the water-saving, circular irrigation system for saline-alkali land improvement of this embodiment, the filtration system 2 further includes a lift pump 23, disposed between the water collection tank 14 and the first filter 21. The lift pump 23 is configured to pressurize the saline-alkali water in the water collection tank 14 and transport it to the first filter 21. The lift pump 23 is signal-connected to the controller 5. The lift pump 23 can generate sufficient pressure to efficiently transport the saline-alkali water from the water collection tank 14 to the first filter 21, avoiding slow or stagnant transport caused by insufficient pressure, thereby improving the overall system's transport efficiency.

[0029] In this embodiment, the first filter 21 is a quartz sand filter, and the second filter 22 is a micro-ultrafiltration membrane filter. The quartz sand filter and the micro-ultrafiltration membrane filter can effectively remove suspended impurities in the salt washing wastewater with high turbidity. Residual solid suspended matter or sediment larger than 5 μm is intercepted in this process, and the water is then sent to the electrosorption system 3.

[0030] See Figure 1In this embodiment of the water-saving, circular irrigation system for saline-alkali land improvement, the electrosorption system 3 comprises a raw water tank 31 and an electrosorption module 32. The front end of the raw water tank 31 is connected to the output of the second filter 22 to receive the saline-alkali water after precision filtration. The rear end of the raw water tank 31 is connected to the input of the electrosorption module 32, which temporarily stores the filtered water and feeds it into the electrosorption module 32 for desalination. The output of the electrosorption module 32 is connected to a water storage tank 41. The raw water tank 31 serves as a pretreatment unit for the electrosorption module 32, temporarily storing the saline-alkali water after precision filtration and ensuring relatively stable water quality entering the electrosorption module 32. This helps the electrosorption module 32 more efficiently remove salt from the water, thereby improving the desalination efficiency of the entire system. In the electrosorption module 32, an electrostatic field is generated by applying an electric field, forcing ions to migrate toward the oppositely charged electrode. This controls the charging and discharging of the electric double layer, changing the ion concentration in the double layer to a value different from that in the bulk, thereby achieving desalination of the aqueous solution. This process not only improves water quality, but also reduces the salt content in the water, providing a more suitable water source for subsequent irrigation.

[0031] See Figure 1 In this embodiment of the water-saving, circular irrigation system for saline-alkali land improvement, the electrosorption system 3 further includes a high-pressure pump 33. This pump 33 is located between the raw water tank 31 and the electrosorption module 32 and is used to drive the precisely filtered saline-alkali water from the raw water tank 31 into the electrosorption module 32. The high-pressure pump 33 is signal-connected to the controller 5. The high-pressure pump 33 provides sufficient pressure to ensure that the saline-alkali water overcomes pipeline resistance and flows smoothly from the raw water tank 31 into the electrosorption module 32.

[0032] In this embodiment, the electrosorption module 32 is also connected to a buffer tank 34. During the electrosorption process, water that has undergone initial desalination by the electrosorption module 32 but whose salt content still does not meet the preset standard is temporarily stored in the buffer tank 34. At this point, the electrosorption module 32 delivers the treated water that meets irrigation standards to the water storage tank 41. When the electrosorption module 32 completes its current desalination task and is ready for the next round of desalination, the water temporarily stored in the buffer tank 34 is pumped back to the electrosorption module 32 for further desalination until its salt content meets irrigation requirements.

[0033] See Figure 1 In this embodiment of the water-saving, circular irrigation system for saline-alkali land improvement, the return water system 4 further includes a return water pump 43 , disposed between a water reservoir 41 and a return water pipe 42 . The return water pump 43 is configured to pressurize water in the water reservoir 41 and transfer it to the return water pipe 42 for irrigation. The return water pump 43 is signal-connected to a controller 5 . The primary function of the return water pump 43 is to pressurize water in the water reservoir 41 and transfer it to the return water pipe 42 to meet irrigation needs. Furthermore, the return water pump 43 is signal-connected to the controller 5 , enabling automated control.

[0034] See Figure 1 In this embodiment of the water-saving circular irrigation system for saline-alkali land improvement, a second liquid level sensor 44 is provided within the water reservoir 41. This second liquid level sensor 44 is used to monitor the water level within the water reservoir 41 and is connected to a controller 5. When the water level is too high, the controller 5 stops the filtration system 2 and the electrosorption system 3, thereby preventing water replenishment and overflow.

[0035] In this embodiment, a water quality monitor 46 is provided in the water tank 41 for real-time monitoring of the water quality in the water tank 41. When the water quality data is lower than the irrigation water quality standard, the filter membrane of the filtration system 2 is replaced and the electric adsorption module 32 is flushed in time.

[0036] See Figure 1 In the water-saving circulating irrigation system for improving saline-alkali land of this embodiment, each irrigation branch pipe 13 is provided with a first valve 16, and each irrigation area 12 is provided with a humidity detector 17. The humidity detector 17 is used to monitor the soil moisture in each irrigation area 12; the controller 5 is respectively connected to the humidity detector 17 by signal, and controls the opening or closing of the first valve 16 on each irrigation branch pipe 13 by monitoring the humidity of each irrigation area 12, so as to achieve water-saving irrigation. A second valve 45 is provided between the water storage tank 41 and the return water pump 43. Each humidity detector 17 monitors the humidity of the soil in each irrigation area 12 in real time. When the detection data of at least one humidity detector 17 is detected to be lower than the standard humidity value, the controller 5 opens the second valve 45 and formulates a preset order according to the number of humidity detectors 17 whose detection data is lower than the standard humidity value, and opens the first valve 16 on each irrigation branch pipe 13 one by one in the preset order to perform irrigation operations; when the detection data of the humidity detector 17 at the location of the current irrigation operation reaches the set humidity value, the first valve 16 on the corresponding branch pipe is closed, and the first valve 16 on the next branch pipe is opened in the preset order until all irrigation operations are completed in the preset order, and finally the second valve 45 is closed to complete the irrigation work of all irrigation areas 12.

[0037] This embodiment also provides a construction method of a saline-alkali land irrigation system, comprising the following steps:

[0038] Step S1: Construct a water collection system 1. Multiple drainage ditches 11 are laid out horizontally and vertically at intervals along the saline-alkali land. Collection tanks 14 are constructed at appropriate locations outside the plots. Multiple horizontal return pipes 42 are positioned at the inner edges of the fields, and multiple irrigation branch pipes 13 are located within the fields and connected to the return pipes 42. Prior to construction, the fields are first leveled to the designed slope, and field ridges are constructed. Then, using both mechanical and manual methods, trenches are dug, and return pipes 42 and irrigation branch pipes 13 are buried. Humidity sensors 17 are also placed in each irrigation area 12. After backfilling, the fields are finely leveled, with a slope gradient of less than 1 / 500.

[0039] Step S2, installing the filtration system 2, installing the lifting pump 23 in the water collection tank 14, and installing the quartz sand filter and the micro-ultrafiltration membrane filter in sequence;

[0040] Step S3, installing the electrosorption system 3, and constructing a raw water pool 31, a high-pressure pump 33, an electrosorption module 32, and a buffer pool 34 in sequence after the micro-ultrafiltration membrane filter;

[0041] Step S4: Build a return water system 4. A reservoir 41 is constructed after the electrosorption system 3. A return water pipe 42 is laid between the reservoir 41 and the field. Irrigation branches 13 are laid along the field ridges, forming independent irrigation areas 12 for each field. Irrigation branches 13 are connected to the return water pipe 42, and a controller 5 is installed to control the irrigation system. The water collection system 1 collects salt-washing wastewater into the collection tank 14 for later irrigation, saving water resources. The filtration system 2 filters impurities from the salt-washing wastewater, effectively ensuring the safety of the electrosorption system 3. The electrosorption system 3 uses an applied voltage to create an electrostatic field, forcing ions to migrate toward oppositely charged electrodes. This controls the charge and discharge of the electric double layer, altering the ion concentration within the double layer, and thereby desalinating the aqueous solution. The return water system 4 recycles saline-alkali land irrigation water, enabling water-saving irrigation and timely, quantitative irrigation of crops. This improves irrigation utilization and efficiency while reducing labor requirements and lowering irrigation costs after saline-alkali land remediation.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0044] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0045] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0046] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A water-saving circulating irrigation system for improving saline-alkali land, characterized in that: include: A water collection system (1), wherein the water collection system (1) comprises a plurality of drainage ditches (11) arranged in a staggered manner in the transverse and longitudinal directions along the saline-alkali land, dividing the saline-alkali land into a plurality of irrigation areas (12), and each of the irrigation areas (12) is provided with an irrigation branch pipe (13); A filtration system (2), the filtration system (2) is connected to the water collection system (1) and filters the saline water in the drainage ditch (11); An electric adsorption system (3), the electric adsorption system (3) is connected to the filtering system (2) and performs electric adsorption desalination on the filtered saline water; A water return system (4), the water return system (4) comprising a water reservoir (41), one end of the water reservoir (41) being connected to the electric adsorption system (3) to receive desalinated water, and the other end of the water reservoir (41) being connected to each of the irrigation branches (13) via a water return pipe (42), the water return system (4) transporting the desalinated water to each of the irrigation areas (12) for irrigation; A controller (5) is respectively connected to the water collection system (1), the filtration system (2), the electric adsorption system (3) and the water return system (4) by signals.

2. The water-saving circulating irrigation system for improving saline-alkali land according to claim 1, characterized in that: The water collection system (1) further comprises a water collection tank (14), wherein the water collection tank (14) is connected to each of the drainage ditches (11), and the water collection tank (14) is used to collect saline-alkali water from each of the drainage ditches (11) and supply the collected saline-alkali water to the filtration system (2).

3. The water-saving circulating irrigation system for improving saline-alkali land according to claim 2, characterized in that: A first liquid level sensor (15) is provided in the water collecting tank (14), and the first liquid level sensor (15) is used to monitor the water level in the water collecting tank (14). The first liquid level sensor (15) is connected to the controller (5) for signal transmission.

4. The water-saving circulating irrigation system for improving saline-alkali land according to claim 2, characterized in that: The filtering system (2) comprises a first filter (21) and a second filter (22); the water collection tank (14), the first filter (21) and the second filter (22) are connected in sequence; the saline water in the water collection tank (14) is first preliminarily filtered by the first filter (21) to remove particulate impurities, and then enters the second filter (22) for precision filtration to remove molecular impurities in the water.

5. The water-saving circulating irrigation system for improving saline-alkali land according to claim 4, characterized in that: The filtration system (2) further comprises a lift pump (23), the lift pump (23) being arranged between the water collection tank (14) and the first filter (21), the lift pump (23) being used to pressurize and transport the saline water in the water collection tank (14) to the first filter (21); The lift pump (23) is signal-connected to the controller (5).

6. The water-saving circulating irrigation system for improving saline-alkali land according to claim 4, characterized in that: The electrosorption system (3) comprises a raw water pool (31) and an electrosorption module (32). The front end of the raw water pool (31) is connected to the output end of the second filter (22) to receive saline water after precise filtration. The rear end of the raw water pool (31) is connected to the input end of the electrosorption module (32) to send the temporarily stored filtered water into the electrosorption module (32) for desalination treatment. The output end of the electrosorption module (32) is connected to the water storage pool (41).

7. The water-saving circulating irrigation system for improving saline-alkali land according to claim 6, characterized in that: The electric adsorption system (3) further comprises a high-pressure pump (33), the high-pressure pump (33) being located between the raw water pool (31) and the electric adsorption module (32), and being used for driving the saline-alkali water that has undergone precision filtration to flow from the raw water pool (31) into the electric adsorption module (32); The high-pressure pump (33) is signal-connected to the controller (5).

8. The water-saving circulating irrigation system for improving saline-alkali land according to claim 1, characterized in that: The return water system (4) further includes a return water pump (43), which is arranged between the water storage tank (41) and the return water pipe (42) and is used to pressurize the water in the water storage tank (41) and transport it to the return water pipe (42) for irrigation operations; The return water pump (43) is connected to the controller (5) via a signal.

9. The water-saving circulating irrigation system for improving saline-alkali land according to claim 1, characterized in that: A second liquid level sensor (44) is provided in the water storage tank (41), and the second liquid level sensor (44) is used to monitor the water level in the water storage tank (41). The second liquid level sensor (44) is connected to the controller (5) for signal transmission.

10. The water-saving circulating irrigation system for improving saline-alkali land according to claim 1, characterized in that: Each of the irrigation branch pipes (13) is provided with a first valve (16), and each of the irrigation areas (12) is provided with a humidity detector (17), and the humidity detector (17) is used to monitor the soil moisture in each irrigation area (12); the controller (5) is respectively connected to the signals of each of the humidity detectors (17), and controls the opening or closing of the first valve (16) on each of the irrigation branch pipes (13) by monitoring the humidity of each irrigation area (12), so as to achieve water-saving irrigation.

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