High saline water and reclaimed water combined use irrigation system and irrigation method

Abstract

The application discloses a kind of high saline water and reclaimed water combined utilization irrigation system and irrigation method, belong to agricultural irrigation technical field, solve the technical problem of poor utilization in the prior art irrigation technology, high saline water and reclaimed water mixed irrigation.It includes the sedimentation tank connected with high saline water input pipeline and the reclaimed water tank connected with reclaimed water input pipeline;Sedimentation tank output end is connected with multi-medium filter tank, and the output end of multi-medium filter tank is connected with buffer tank, and the output end of buffer tank is connected with mixing tank, and the connection of buffer tank and mixing tank is high saline water input end;The output end of reclaimed water tank is connected with mixing tank, and the connection of reclaimed water tank and mixing tank is reclaimed water input end, and the output end of mixing tank is connected with irrigation pipeline and communicates.This application can be better used for high saline water and reclaimed water mixed irrigation work, and has wide application range, saves energy, and has good irrigation effect.

Description

Technical Field

[0001] This invention relates to the field of agricultural irrigation technology, specifically to an irrigation system and method that utilizes a combination of saline water and reclaimed water. Background Technology

[0002] my country has abundant underground saline water resources. The salts brought into the soil by saline irrigation can interact with the soil's chemical elements and soil particles, changing the soil's physical and chemical characteristics, leading to changes in soil moisture and salinity, and affecting soil water availability and crop growth.

[0003] Reclaimed water refers to wastewater or rainwater that has undergone appropriate treatment to meet certain water quality standards and usage requirements, making it suitable for beneficial use. Compared to seawater desalination and inter-basin water transfer, reclaimed water has significant advantages. From an economic perspective, reclaimed water has the lowest cost; from an environmental perspective, wastewater reuse helps improve the ecological environment and achieve a virtuous cycle of the water ecosystem.

[0004] Currently, saline water irrigation mainly involves intermittent saline water irrigation, saline-fresh water mixed irrigation, and saline-sewage mixed irrigation, which directly infiltrates saline water into the soil. This can cause certain damage to the soil and crops. In order to improve the utilization rate of saline water and reclaimed water and achieve good irrigation results, this paper proposes an irrigation system and method that combines saline water and reclaimed water. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a safe, efficient, and water-saving irrigation system and method that combines saline water and reclaimed water.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides an irrigation system for the combined use of saline water and reclaimed water, comprising a sedimentation tank connected to a saline water input pipe and a reclaimed water tank connected to a reclaimed water input pipe; the output end of the sedimentation tank is connected to a multi-media filter tank, the output end of the multi-media filter tank is connected to a buffer tank, the output end of the buffer tank is connected to a mixing tank, and the connection between the buffer tank and the mixing tank is the saline water input end.

[0008] The output end of the reclaimed water tank is connected to the mixing tank, and the connection between the reclaimed water tank and the mixing tank is the reclaimed water input end. The output end of the mixing tank is connected to the irrigation pipeline.

[0009] The technical effects of adopting the above technical solution are as follows: the high salinity water is initially settled by setting up a sedimentation tank, and the high salinity water after sedimentation enters a multi-media filter tank for filtration. The high salinity water after filtration becomes semi-saline or slightly saline water. After passing through a buffer tank, it enters a mixing tank to mix with reclaimed water to further reduce the salinity. The mixed water after mixing and stirring in the mixing tank enters the pipeline to complete the irrigation.

[0010] Optionally or preferably, the multi-media filter tank includes an inner tank and an outer tank sleeved outside the inner tank, and the inner tank and the outer tank are fixed together by a plurality of limiting posts;

[0011] A conical filter element is detachably connected to the upper part of the inner tank. The upper end of the conical filter element is connected to the outlet pipe of the sedimentation tank via a flange connecting hose. A cylindrical filter element is connected to the lower part of the inner tank. A liquid flow channel one is formed between the conical filter element and the cylindrical filter element. A liquid flow channel two is formed between the outer wall of the inner tank and the inner wall of the outer tank. High-salinity water is introduced through the conical filter element, passes through liquid flow channel one and liquid flow channel two respectively, and is output from the outlet of the multi-media filter tank. Multiple arc-shaped filter elements are installed in liquid flow channel two.

[0012] The technical effect of adopting the above technical solution is as follows: by setting up inner tank and outer tank respectively, it can accommodate a variety of filter elements, and form multiple filtration channels while maintaining a certain flow rate, thereby improving the filtration effect of high salinity water.

[0013] Optionally or preferably, the conical filter element includes a top cover plate and an outer shell. The upper end of the top cover plate is provided with a flange connecting hose, the middle part of the top cover plate is connected to a liquid inlet pipe, and the lower end of the liquid inlet pipe is a gradually expanding section.

[0014] Multiple overflow holes are formed on the side wall of the outer casing. At least one filter screen is provided between the inner wall of the outer casing and the outer wall of the liquid inlet pipe. The filter screen is located below the multiple overflow holes, and the gradually expanding section of the liquid inlet pipe is located below the filter screen.

[0015] The technical effect of adopting the above technical solution is as follows: by setting up a flanged connecting hose, the impact on the connecting pipe when the multi-media filter tank vibrates is reduced, and the connection is prevented from loosening and causing sealing failure.

[0016] Optionally or preferably, the bottom of the outer tank is fitted with a vibration jacket, and the vibration jacket is provided with a plurality of vibrators, which are used to vibrate the inner wall of the outer tank to remove sediment.

[0017] The technical effect of adopting the above technical solution is that by setting up a vibration jacket and multiple vibrators inside the vibration jacket, it is possible to periodically remove the sediment and scale generated on the inner wall of the outer tank.

[0018] Optionally or preferably, a drive motor is provided on the upper part of the mixing tank, and a stirring paddle is provided at the bottom end of the drive motor transmission shaft. The stirring paddle is used to perform transverse mixing and stirring of the liquid in the mixing tank.

[0019] The drive motor transmission shaft is also fixedly connected to a winder, on which two lifting ropes are wound in opposite directions. The lower ends of the lifting ropes are connected to a metal ring through guide one and guide two, respectively. The two sides of the metal ring are slidably connected to a limiting rod, which is fixed inside the mixing tank. The metal ring is used to longitudinally mix and stir the liquid in the mixing tank.

[0020] The technical effect of adopting the above technical solution is that by setting up a stirring paddle and a metal ring respectively, the horizontal and vertical stirring and mixing of the mixed liquid in the mixing tank can be realized, thereby achieving a better mixing effect of high saline water and reclaimed water.

[0021] Optionally or preferably, the lower part of the mixing tank is connected to a sampling chamber; the mixing tank is equipped with a conductivity detection device.

[0022] The technical effect of adopting the above technical solution is that by setting up a sampling chamber and a conductivity detection device, the water state in the mixing tank can be measured in real time, so that personnel can judge whether it meets the irrigation standards and irrigation needs.

[0023] Optionally or preferably, a dosing tank is connected between the output end of the mixing tank and the irrigation pipe, and the contents of the dosing tank are silicon fertilizer.

[0024] The technical effects of adopting the above technical solution are as follows: applying silicon fertilizer can improve the crop's ability to resist salt stress and heavy metal stress, thereby improving the crop's salt tolerance, promoting normal crop growth, and also reducing the accumulation of heavy metals in crops.

[0025] Optionally or preferably, the number of multi-media filter tanks is multiple and arranged in series.

[0026] The technical effect of adopting the above technical solution is that multiple multi-media filter tanks arranged in series can improve the filtration effect of high salinity water, thereby improving the utilization rate and effect of high salinity water.

[0027] Optionally or preferably, the plurality of limiting posts are elastic limiting posts.

[0028] The technical effect of adopting the above technical solution is that the elastic limiting column can reduce the impact on the inner tank when the outer tank is vibrated and the jacket is vibrated to remove scale, and avoid loosening and sealing failure at the connection between the inner tank and the pipeline.

[0029] An irrigation method for a combined saline water and reclaimed water irrigation system includes the following steps:

[0030] S1. Two to three days before sowing, irrigate the planting area with filtered high-saline water; at this time, the reclaimed water input end is closed, and irrigation is carried out after the water mineralization is measured to be less than 1.5g / L through the sampling chamber, with an irrigation quota of 50mm.

[0031] S2. One to two days after sowing, irrigate the planting area with reclaimed water. At this time, close the high salinity water input end and irrigate after the water mineralization is measured to be less than 1.0 g / L through the sampling chamber. The irrigation quota is 20 mm.

[0032] S3. 1-3 days after emergence, mix the saline water and reclaimed water in a mixing tank and then irrigate the planting area. At this time, both the saline water inlet and the reclaimed water inlet are open. Irrigate after the water mineralization is measured to be 2.5-3.5 g / L through the sampling chamber. The irrigation quota is 30 mm.

[0033] S4. Irrigate again every 10 minutes until seedlings grow.

[0034] S5. After the seedling stage, the planting area is irrigated by mixing the saline water and reclaimed water through the mixing tank. At this time, both the saline water inlet and the reclaimed water inlet are opened. Irrigation is carried out after the water mineralization is measured to be 4-5 g / L through the sampling chamber. The irrigation quota is 50 mm.

[0035] S6. Irrigate again every 30-40 days thereafter.

[0036] Based on the above technical solution, the present invention can produce at least the following technical effects:

[0037] The present invention provides an irrigation system and method for combined utilization of saline water and reclaimed water, which can perform preliminary sedimentation of saline water by setting up a sedimentation tank, and then filter the saline water after sedimentation into a multi-media filter tank. After being mixed with reclaimed water, it is used for irrigation, which improves the utilization of saline water and reduces resource waste.

[0038] With separate inner and outer tanks, it can accommodate various filter elements and form multiple filtration channels while maintaining a certain flow rate, thereby improving the filtration effect of high salinity water. At the same time, by setting up an excitation jacket and multiple vibrators inside the excitation jacket, it can periodically remove the sediment and scale generated on the inner wall of the outer tank, avoiding blockage.

[0039] Equipped with a sampling chamber and conductivity detection device, the water condition in the mixing tank can be measured in real time, allowing personnel to determine whether it meets irrigation standards and needs. Attached Figure Description

[0040] Figure 1This is a schematic diagram of the layout of the irrigation system for the combined utilization of saline water and reclaimed water according to the present invention;

[0041] Figure 2 This is a front cross-sectional view of the multi-media filter tank in the irrigation system for combined utilization of saline water and reclaimed water of the present invention.

[0042] Figure 3 This is an exploded view of the multi-media filter tank in the irrigation system for combined utilization of saline water and reclaimed water of the present invention.

[0043] Figure 4 This is a front cross-sectional view of the conical filter element in the irrigation system for combined utilization of saline water and reclaimed water of the present invention.

[0044] Figure 5 This is a schematic diagram of the overall structure of the cone filter element in the irrigation system for combined utilization of saline water and reclaimed water of the present invention;

[0045] Figure 6 This is a schematic diagram of the overall structure of the outer tank in the irrigation system for combined utilization of saline water and reclaimed water of the present invention;

[0046] Figure 7 This is a schematic diagram of the overall structure of the inner tank in the irrigation system for combined utilization of saline water and reclaimed water of the present invention.

[0047] Figure 8 This is a schematic diagram of the mixing tank in the irrigation system for combined utilization of saline water and reclaimed water of the present invention.

[0048] In the diagram: 1. Sedimentation tank; 2. Multi-media filter tank; 21. Inner tank; 22. Outer tank; 2201. Vibration jacket; 2202. Vibrator; 23. Limiting post; 24. Conical filter element; 2401. Flange connecting hose; 2402. Top cover plate; 2403. Outer shell; 2404. Liquid inlet pipe; 2405. Overflow hole; 2406. Filter screen; 25. Columnar filter element; 26. Liquid flow channel one; 27. Liquid flow channel two; 28. Arc-shaped filter element; 3. Reclaimed water tank; 4. Mixing tank; 41. Drive motor; 42. Agitator; 43. Winding device; 44. Lifting rope; 45. Guide component one; 46. Guide component two; 47. Metal ring; 48. Limiting rod; 49. Sampling chamber; 5. Buffer tank; 6. Dosing tank. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0050] Example 1

[0051] Please see Figures 1 to 7 A combined irrigation system for saline water and reclaimed water includes a sedimentation tank 1 connected to a saline water input pipe and a reclaimed water tank 3 connected to a reclaimed water input pipe. The output end of the sedimentation tank 1 is connected to a saline water filtration device. In this embodiment, the saline water filtration device includes multiple multi-media filter tanks 2 connected in series. Here, "connected in series" means that the output end of the upper multi-media filter tank 2 is connected to the input end of the lower multi-media filter tank 2. After multi-stage filtration, the saline water becomes brackish or slightly saline water, which is convenient for subsequent mixing with reclaimed water for irrigation.

[0052] It should be noted that, for ease of description and understanding, the input and output ends of each component, as well as the description of the valve body and pump body within each component, are omitted in this embodiment. Those skilled in the art can easily understand the setting method and position of the valve body and pump body in this embodiment.

[0053] The output end of the final multi-media filter tank 2 is connected to the buffer tank 5, and the output end of the buffer tank 5 is connected to the mixing tank 4; the output end of the reclaimed water tank 3 is connected to the other side of the mixing tank 4. The connection between the buffer tank 5 and the mixing tank 4 is the high salinity water input end, and the connection between the reclaimed water tank 3 and the mixing tank 4 is the reclaimed water input end. The output end of the mixing tank 4 is connected to the irrigation pipeline through a pipe.

[0054] In this embodiment, a dosing tank 6 is provided between the output end of the mixing tank 4 and the irrigation pipe. The contents of the dosing tank 6 are silicon fertilizer. Applying silicon fertilizer can improve the crop's ability to resist salt stress and heavy metal stress, thereby improving the crop's salt tolerance, promoting normal crop growth, and reducing the accumulation of heavy metals in the crop. The application method can be self-priming or through a pump.

[0055] In this embodiment, the multi-media filter tank 2 includes an inner tank 21 and an outer tank 22 sleeved outside the inner tank 21. The inner tank 21 and the outer tank 22 are fixed together by a plurality of limiting posts 23. The limiting posts 23 are preferably elastic limiting posts. Since the inner tank 21 is connected to the external input pipe, the elastic limiting posts can reduce the vibration of the inner tank 21 from the outer tank 22 and the water flow, thereby preventing the connection between the inner tank 21 and the external input pipe from loosening or sealing failure.

[0056] The inner tank 21 is detachably connected to a conical filter element 24 at the top and a cylindrical filter element 25 is threadedly connected to the bottom. The upper end of the conical filter element 24 is connected to the outlet pipe of the sedimentation tank 1 through a flange connection hose 2401. The flange connection hose 2401 further reduces the vibration of the inner tank 21 from the outer tank 22 and the water flow.

[0057] Please see Figure 2A liquid flow channel 26 is formed between the conical filter element 24 and the cylindrical filter element 25. A liquid flow channel 27 is formed between the outer wall of the inner tank 21 and the inner wall of the outer tank 22. The direction of liquid flow in the liquid flow channel 26 and the liquid flow channel 27 is shown by arrows in the figure. High salinity water is introduced from the upper end of the conical filter element 24, and after passing through the liquid flow channel 26 and the liquid flow channel 27, it is output from the output end of the multi-media filter tank 2.

[0058] In this embodiment, multiple arc-shaped filter elements 28 are provided within the liquid flow channel 27. The arc-shaped filter elements 28 can be chemical media inserts, on which various filter media can be installed. The filter media used in the aforementioned conical filter element 24, cylindrical filter element 25, and arc-shaped filter element 28 can be a quartz sand filter media layer and / or anthracite filter media layer.

[0059] Please see Figures 4 to 5 In this embodiment, the conical filter element 24 includes a top cover plate 2402 for sealing and setting a flange connection hose 2401, and a conical outer shell 2403 is connected to the lower part of the top cover plate 2402; an inlet pipe 2404 is connected to the middle part of the top cover plate 2402, and a conical gradually expanding section is formed at the lower end of the inlet pipe 2404.

[0060] Multiple strip-shaped overflow holes 2405 are formed on the side wall of the outer casing 2403. At least one filter screen 2406 is provided between the inner wall of the outer casing 2403 and the outer wall of the liquid inlet pipe 2404. The filter screen 2406 is located below the multiple overflow holes 2405. The liquid inlet pipe 2404 passes through the filter screen 2406. The lower part of the liquid inlet pipe 2404 passing through the filter screen 2406 forms a gradually expanding section. The tapered gradually expanding section allows the liquid inside the outer casing 2403 to slowly accumulate, the liquid level to rise steadily and be filtered through the filter screen 2406, and then overflow through the overflow holes 2405 into the liquid flow channel 26.

[0061] Example 2

[0062] Based on Embodiment 1, this embodiment includes a vibration jacket 2201 fitted at the bottom of the outer tank 22 to remove sediment and scale from the inner wall of the outer tank 22, thereby improving the service life and filtration effect of the outer tank 22.

[0063] In this embodiment, a vibration jacket 2201 is fitted at the bottom of the outer tank 22. Multiple vibrators 2202 are installed inside the vibration jacket 2201. The vibrators 2202 are used to generate vibration on the inner wall of the outer tank 22, thereby discharging the sediment and scale through the discharge port. The discharge port can be located at the lower part of the outer tank 22.

[0064] Example 3

[0065] Please see Figure 8Based on Embodiment 2, this embodiment exemplarily shows the structure of the mixing tank 4. The mixing tank 4 can improve the mixing efficiency of filtered saline water and reclaimed water, and test the mixed liquid so that personnel can determine whether it meets irrigation standards.

[0066] In this embodiment, a drive motor 41 is provided on the upper part of the mixing tank 4, and a stirring paddle 42 is provided at the bottom end of the drive shaft of the drive motor 41. A winder 43 is also fixedly connected to the drive shaft of the drive motor 41. Two lifting ropes 44 are wound on the winder 43 respectively. The winding method only needs to ensure that the two lifting ropes 44 can be wound and released simultaneously when the winder 43 rotates. The lower ends of the lifting ropes 44 are connected to the metal ring 47 through guide 1 45 and guide 2 46 respectively. The two sides of the metal ring 47 are slidably connected to the limiting rod 48 respectively, wherein the limiting rod 48 is fixedly connected inside the mixing tank 4.

[0067] In actual operation, the forward and reverse rotation of the stirring paddle 43 and the winding device 43 is achieved by the drive motor 41. The stirring paddle 43 is used to perform transverse mixing of the liquid in the mixing tank 4, and the metal ring 43 is used to perform longitudinal mixing of the liquid in the mixing tank 4 because it moves up and down along the limit rod 48 under the action of the lifting rope 44.

[0068] In this embodiment, a conductivity detection device is installed inside the mixing tank 4, and a sampling chamber 49 is also installed at the bottom. Personnel can use the conductivity detection device and the sampling chamber 49 to detect the liquid composition inside the mixing tank 4 to determine whether it meets the subsequent irrigation standards.

[0069] Example 4

[0070] Based on Embodiment 3, this embodiment provides an irrigation method for a combined saline water and reclaimed water irrigation system, including the following steps:

[0071] S1. Two to three days before sowing, irrigate the planting area with filtered high-saline water; at this time, close the reclaimed water input end, and irrigate after the water mineralization is measured to be less than 1.5g / L through sampling chamber 49, with an irrigation quota of 50mm.

[0072] S2. One to two days after sowing, irrigate the planting area with reclaimed water. At this time, close the high salinity water input end and irrigate after the water mineralization is measured to be less than 1.0 g / L through sampling chamber 49. The irrigation quota is 20 mm.

[0073] S3. 1-3 days after emergence, mix the saline water and reclaimed water in the mixing tank 4 and then irrigate the planting area. At this time, both the saline water inlet and the reclaimed water inlet are opened. Irrigate after the water mineralization is measured to be 2.5-3.5 g / L through the sampling chamber 49. The irrigation quota is 30 mm.

[0074] S4. Irrigate again every 10 minutes until seedlings grow.

[0075] S5. After the seedling stage, the high salinity water and reclaimed water are mixed in the mixing tank 4 and then used to irrigate the planting area. At this time, both the high salinity water inlet and the reclaimed water inlet are opened. The water mineralization is measured to be 4-5 g / L through the sampling chamber 49 before irrigation is carried out. The irrigation quota is 50 mm.

[0076] S6. Irrigate again every 30-40 days thereafter.

[0077] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An irrigation system that combines saline water and reclaimed water, characterized in that, It includes a sedimentation tank (1) connected to a high-salinity water input pipe and a reclaimed water tank (3) connected to a reclaimed water input pipe; the output end of the sedimentation tank (1) is connected to a multi-media filter tank (2), the output end of the multi-media filter tank (2) is connected to a buffer tank (5), the output end of the buffer tank (5) is connected to a mixing tank (4), and the connection between the buffer tank (5) and the mixing tank (4) is the high-salinity water input end; The output end of the reclaimed water tank (3) is connected to the mixing tank (4), the connection between the reclaimed water tank (3) and the mixing tank (4) is the reclaimed water input end, and the output end of the mixing tank (4) is connected to the irrigation pipeline; The multi-media filter tank (2) includes an inner tank (21) and an outer tank (22) sleeved outside the inner tank (21). The inner tank (21) and the outer tank (22) are fixed together by a plurality of limiting posts (23). The upper part of the inner tank (21) is detachably connected to a conical filter element (24), and the upper end of the conical filter element (24) is connected to the output pipe of the sedimentation tank (1) through a flange connecting hose (2401); the lower part of the inner tank (21) is connected to a columnar filter element (25); a liquid flow channel one (26) is formed between the conical filter element (24) and the columnar filter element (25), and a liquid flow channel two (27) is formed between the outer wall of the inner tank (21) and the inner wall of the outer tank (22). High salinity water is introduced through the conical filter element (24), and after passing through the liquid flow channel one (26) and the liquid flow channel two (27) respectively, it is output from the output end of the multi-media filter tank (2); multiple arc-shaped filter elements (28) are provided in the liquid flow channel two (27).

2. The irrigation system for combined utilization of saline water and reclaimed water according to claim 1, characterized in that, The conical filter element (24) includes a top cover plate (2402) and an outer shell (2403). The top cover plate (2402) is provided with a flange connecting hose (2401) at its upper end. The top cover plate (2402) is connected to an inlet pipe (2404) in the middle. The lower end of the inlet pipe (2404) is a gradually expanding section. Multiple overflow holes (2405) are formed on the side wall of the outer shell (2403). At least one filter screen (2406) is provided between the inner wall of the outer shell (2403) and the outer wall of the liquid inlet pipe (2404). The filter screen (2406) is located below the multiple overflow holes (2405), and the gradually expanding section of the liquid inlet pipe (2404) is located below the filter screen (2406).

3. The irrigation system for combined utilization of saline water and reclaimed water according to claim 2, characterized in that, The bottom of the outer tank (22) is fitted with a vibration jacket (2201), and a plurality of vibrators (2202) are provided inside the vibration jacket (2201). The plurality of vibrators (2202) are used to generate vibration on the inner wall of the outer tank (22) to remove sediment.

4. The irrigation system for combined utilization of saline water and reclaimed water according to claim 1, characterized in that, The mixing tank (4) is equipped with a drive motor (41) at the top, and a stirring paddle (42) is provided at the bottom of the drive shaft of the drive motor (41). The stirring paddle (42) is used to mix and stir the liquid in the mixing tank (4) laterally. The drive shaft of the drive motor (41) is also fixedly connected to a winder (43), on which two lifting ropes (44) are wound respectively. The lower ends of the lifting ropes (44) are connected to the metal ring (47) through guide one (45) and guide two (46) respectively. The two sides of the metal ring (47) are slidably connected to the limiting rod (48) respectively. The limiting rod (48) is fixed inside the mixing tank (4). The metal ring (47) is used to longitudinally mix and stir the liquid in the mixing tank (4).

5. The irrigation system for combined utilization of saline water and reclaimed water according to claim 4, characterized in that, The lower part of the mixing tank (4) is connected to a sampling chamber (49); a conductivity detection device is installed inside the mixing tank (4).

6. The irrigation system for combined utilization of saline water and reclaimed water according to claim 1, characterized in that, The output end of the mixing tank (4) is connected to the irrigation pipe by a dosing tank (6), the contents of which are silicon fertilizer.

7. The irrigation system for combined utilization of saline water and reclaimed water according to claim 1, characterized in that, The number of the multi-media filter tanks (2) is multiple and they are connected in series.

8. The irrigation system for combined utilization of saline water and reclaimed water according to claim 1, characterized in that, The plurality of the limiting posts (23) are elastic limiting posts.

9. An irrigation method based on the combined utilization irrigation system of saline water and reclaimed water according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Two to three days before sowing, irrigate the planting area with filtered saline water. At this time, the reclaimed water input is closed. Irrigate after the water mineralization is measured to be less than 1.5 g / L through the sampling chamber (49). The irrigation quota is 50 mm. S2. One to two days after sowing, irrigate the planting area with reclaimed water. At this time, close the high salinity water input end and irrigate after the water mineralization is less than 1.0 g / L by sampling chamber (49). The irrigation quota is 20 mm. S3. 1-3 days after emergence, mix high salinity water and reclaimed water in a mixing tank (4) and then irrigate the planting area. At this time, both the high salinity water inlet and the reclaimed water inlet are opened. After the water mineralization is measured to be 2.5-3.5 g / L by the sampling chamber (49), irrigation is carried out with an irrigation quota of 30 mm. S4. Irrigate again every 10 minutes until seedlings grow. S5. After the seedling stage, the high salinity water and reclaimed water are mixed in the mixing tank (4) and then used to irrigate the planting area. At this time, both the high salinity water input end and the reclaimed water input end are opened. The water mineralization is measured to be 4-5 g / L through the sampling chamber (49) and then irrigation is carried out. The irrigation quota is 50 mm. S6. Irrigate again every 30-40 days thereafter.

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