Vacuum concealed pipe circulating water salt elimination system

Abstract

The utility model provides a vacuum concealed pipe circulating water salt elimination system which comprises a plurality of concealed pipes which are respectively connected with a water conveying pipe through a water collecting pipe; the concealed pipe comprises a pipe body, and a plurality of water collecting holes are formed in the pipe body; each water collecting pipe is provided with a vacuum negative-pressure drainage device, the water conveying pipe is connected with a salt washing water treatment device, and the water conveying pipe is provided with a water suction pump; a water outlet pipe is further connected to the salt washing water treatment device, and the water outlet pipe is connected with an irrigation leaching water distribution device used for leaching soil; the washing brine treatment device comprises an electrodialysis treatment unit, the front end of the electrodialysis treatment unit is connected with a reservoir, the rear end is connected with a fresh water tank, and a flowmeter is arranged on a pipeline for connecting the electrodialysis treatment unit and the reservoir; the fresh water pool is connected with the water outlet pipe, the reservoir is connected with the water pipe, the fresh water pool is further provided with an overflow pipe, and a drainage port end of the overflow pipe extends to the drainage ditch. According to the invention, the salt elimination efficiency is greatly improved, the investment cost of concealed pipe laying is reduced, the water is saved, and water pollution is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of saline-alkali land management and development, and in particular relates to a vacuum blind pipe circulating water and salt removal system. Background Art

[0002] Saline-alkali land refers to land with a high content of soluble salts in the soil, making it unfavorable for crop growth. Freshwater flushing combined with underground pipe drainage is one of the traditional methods for managing saline-alkali land. This method, based on the laws of water and salt migration, uses underground pipes to remove excess water and salt from the soil, thereby controlling the groundwater level below a critical depth. Underground pipe drainage has the advantages of saving land and effectively controlling groundwater level rise, making it suitable for all types of soil. However, the depth of underground pipes and the spacing between pipes can have significant variability in the effect of salt leaching, often requiring large irrigation water volumes and a one-time underground pipe laying investment. Existing technologies typically use underground pipes and open ditches to drain salt water, which occupy a large area and waste land. The salt drainage water is directly discharged into surface water bodies, which can easily cause water pollution. Water and soil imbalance in water-scarce areas further restricts the management and development of saline-alkali land. Therefore, it is necessary to design a comprehensive saline-alkali land management technology that saves water and land, and achieves the economy and efficiency of underground pipe drainage. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a vacuum dark pipe circulating water and salt removal system.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A vacuum blind pipe circulating water and salt removal system comprises several blind pipe areas arranged in the soil, wherein the several blind pipes arranged in each blind pipe area are connected to the water supply pipe through a water collecting pipe; the blind pipe comprises a pipe body, which is provided with several water collecting holes; each water collecting pipe is installed with a vacuum negative pressure drainage device, the water supply pipe is connected to a brine washing treatment device, and a water pump is provided on the water supply pipe; the brine washing treatment device is also connected to a water outlet pipe, and the water outlet pipe is connected to an irrigation and leaching water distribution device for leaching the soil; the brine washing treatment device comprises an electrodialysis treatment unit, the front end of the electrodialysis treatment unit is connected to a water reservoir, and the rear end is connected to a fresh water tank, and a flow meter is provided on the pipeline connecting the electrodialysis treatment unit and the water reservoir; the fresh water tank is connected to the water outlet pipe, and the water reservoir is connected to the water supply pipe. At the same time, an overflow pipe is also provided on the fresh water tank, and the drainage outlet end of the overflow pipe extends to the drainage ditch.

[0006] Furthermore, the vacuum negative pressure drainage device includes a water-gas separation tank and a vacuum pump for vacuuming the water-gas separation tank. The water-gas separation tank is provided with a through pipe connected to the water collecting pipe, and a drain head is provided at the lower part of the water-gas separation tank, which is connected to the water supply pipe.

[0007] Furthermore, a vacuum gauge is installed on the water-gas separation tank.

[0008] Furthermore, a venting head is provided on the upper portion of the water-gas separation tank.

[0009] Furthermore, a one-way valve is installed on the air release head.

[0010] Furthermore, a stop valve is installed on the water discharge head.

[0011] Furthermore, the water collection holes on the pipe body are arranged in several rows, and the angle formed by the line connecting two adjacent rows of water collection holes and the center of the pipe body is an acute angle.

[0012] Furthermore, the diameter of the water collection hole is 0.02-0.05 cm.

[0013] Furthermore, the outside of the pipe body is covered with a permeable geotextile.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The invention uses a vacuum pump to extract moisture and air from the soil, creating negative pressure. This speeds up the drainage process in the underground pipe, thereby shortening the time required for a single salt wash. The brine enters the brine treatment unit for desalination, then circulates through the irrigation and leaching system to rinse the soil, or is discharged into a drainage ditch after treatment. This comprehensive method for recycling water significantly improves salt drainage efficiency, reduces investment costs for underground pipe installation, conserves water, and prevents water pollution caused by the direct discharge of brine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of the system structure layout created by the present invention;

[0018] Figure 2 A schematic diagram of the concealed pipe portion in the present invention;

[0019] Figure 3 A schematic diagram of the vacuum negative pressure drainage device in the present invention;

[0020] Figure 4 This is a schematic diagram of the brine treatment device for washing in the present invention. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] A vacuum dark pipe circulating water desalination system, such as Figures 1 to 4 As shown, it includes several concealed pipe areas 1 arranged in the soil, and several concealed pipes 3 arranged in each concealed pipe area are connected to the water pipe 6 through the water collecting pipe 4. As an example, the laying spacing of the concealed pipes 3 is 30-50m, and the laying depth is 0.8-1.0m. The concealed pipes are made of PE polyethylene pipes with a diameter of 30-50mm and water collection holes at intervals of 3-5cm. The concealed pipes include a pipe body, and a plurality of water collection holes 32 are provided on the pipe body. Each water collecting pipe is installed with a vacuum negative pressure drainage device 5, the water supply pipe is connected to the washing brine treatment device 8, and a water pump 7 is provided on the water supply pipe. In an optional embodiment, the water collection holes on the pipe body are arranged in several rows, and the angle formed by the connecting line between two adjacent rows of water collection holes and the center of the pipe body is an acute angle. The water collection holes are arranged crosswise to increase the water inlet area. Usually, the diameter of the water collection hole is 0.02-0.05cm.

[0026] The outside of the concealed pipe is covered with a permeable geotextile 31. The permeable geotextile uses its good air permeability and water permeability to allow water to flow through, while effectively carrying soil particles, fine sand, small stones, etc. to prevent them from entering the concealed pipe and causing blockage of the water collection holes. Its good water conductivity can form a drainage channel inside the soil, which is conducive to the discharge of excess liquid and gas in the soil structure. This drainage effect helps to move water and salt in the soil.

[0027] The brine treatment device is also connected to a water outlet pipe 9, which is connected to the rinsing water inlet valve 2 of the irrigation and rinsing water distribution device 11 used to rinse the soil. In order to better control the flow of the water outlet pipe, a flow meter 10 can be set on the water outlet pipe, and the flow meter can be used to quantitatively control the irrigation and rinsing water. The brine treatment device includes an electrodialysis treatment unit 82, the front end of which is connected to a water reservoir 81 and the rear end is connected to a fresh water tank 84. In an optional embodiment, a flow meter 83 is provided on the pipeline connecting the electrodialysis treatment unit and the water reservoir, and the water flow of the irrigation and rinsing water distribution device is controlled by the flow meter. For example, the water outlet pipe and the water distribution pipe of the irrigation and rinsing water distribution system are selected from PVC pipes with a diameter of 50-100mm. A water outlet hole is opened on the water distribution pipe, and the aperture of the water outlet hole is 5-10mm.

[0028] This embodiment of the present invention is an electrodialysis system, which uses an electric field to force charged ions through an ion exchange membrane, separating salt from water. The treated brine enters a freshwater tank for temporary storage. The freshwater tank is connected to the outlet pipe, and the water storage tank is connected to the water supply pipe. The freshwater tank is also equipped with an overflow pipe 12, the outlet of which extends to a drain ditch 13. This allows the water in the freshwater tank to overflow into the drain when the water is too high.

[0029] The vacuum negative pressure drainage device includes a water-gas separation tank 52 and a vacuum pump 53 for evacuating the water-gas separation tank. The water-gas separation tank is provided with a through pipe 51 connected to the water collection pipe, and a water discharge head 56 is provided at the bottom of the water-gas separation tank, which is connected to the water supply pipe. Typically, a vacuum gauge 54 is installed on the water-gas separation tank. A vent head 55 is provided at the top of the water-gas separation tank. For example, a one-way valve is installed on the vent head to discharge the gas in the water-gas separation tank. A shut-off valve is installed on the vent head, which can be closed or opened as needed.

[0030] The vacuum pumps of several vacuum negative pressure drainage devices are used to extract air, quickly forming a negative pressure (negative pressure not less than 80Kpa) in each dark pipe area of ​​the treatment unit, and the vacuum degree is displayed by a vacuum gauge (the range of the vacuum gauge should be less than -0.1MPa). The vacuum pump negative pressure drainage device accelerates the movement of brine to the dark pipe, and the brine and gas in the soil enter the water-gas separation tank through the water collecting pipe and the through pipe. The gas is discharged through the vent head, and the brine is connected to the water pipe through the drain head and enters the brine treatment device through the pump. Usually, the pump flow rate is not less than 10m3 / h.

[0031] A method for removing salt using the vacuum dark pipe circulating water and salt removal system comprises the following steps:

[0032] Several groups of concealed pipes are set up in the saline-alkali land. Each group of concealed pipes is connected to the water supply pipe by a water collecting pipe, and a vacuum negative pressure drainage device is set on the water collecting pipe. The vacuum negative pressure drainage device draws air to extract moisture and air in the soil, forming a negative pressure, which speeds up the drainage process of the concealed pipe. The brine extracted by the vacuum negative pressure drainage device is desalinated by the brine washing treatment device and then supplied to the irrigation and washing water distribution device through the outlet pipe to realize recycling and achieve the purpose of water saving. Moreover, the treated brine is recycled or discharged into the drainage ditch, which can effectively prevent surface water pollution.

[0033] The present invention uses vacuum negative pressure technology to increase the hydraulic gradient and increase the pumping efficiency, thereby improving the drainage efficiency of the underground pipe salt drainage, reducing the salt washing time, and significantly improving the salt washing efficiency. Due to the increase in the hydraulic gradient between the underground pipe and the surface, the horizontal influence range of the underground pipe increases, so the spacing between the underground pipes can be appropriately increased, which can reduce the use of pipes and reduce the cost of laying underground pipes. The brine is treated by a brine treatment device and then discharged or recycled, which helps to protect water resources and reduce environmental pollution. In summary, the present invention combines the technology of underground pipe salt drainage, vacuum negative pressure and water desalination to adapt to different types of saline-alkali land and improve the flexibility and applicability of governance. By reducing the salt washing time and reducing the cost of underground pipes, this combined technology can reduce the overall governance cost and improve economic benefits.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vacuum dark pipe circulating water desalination system, characterized by: It includes several concealed pipe areas arranged in the soil, and the several concealed pipes arranged in each concealed pipe area are connected to the water pipe through a water collecting pipe; the concealed pipe includes a pipe body, which is provided with a number of water collecting holes; each water collecting pipe is installed with a vacuum negative pressure drainage device, the water pipe is connected to the brine treatment device, and a water pump is provided on the water pipe; the brine treatment device is also connected to a water outlet pipe, and the water outlet pipe is connected to an irrigation and washing water distribution device used for leaching the soil; the brine treatment device includes an electrodialysis treatment unit, the front end of the electrodialysis treatment unit is connected to a water reservoir, and the rear end is connected to a fresh water tank, and a flow meter is provided on the pipeline connecting the electrodialysis treatment unit and the water reservoir; the fresh water tank is connected to the water outlet pipe, and the water reservoir is connected to the water pipe. At the same time, an overflow pipe is also provided on the fresh water tank, and the drainage end of the overflow pipe extends to the drainage ditch.

2. A vacuum dark pipe circulating water desalination system according to claim 1, characterized in that: The vacuum negative pressure drainage device includes a water-gas separation tank and a vacuum pump for vacuuming the water-gas separation tank. The water-gas separation tank is provided with a through pipe connected to the water collecting pipe, and a drain head is provided at the lower part of the water-gas separation tank, which is connected to the water supply pipe.

3. A vacuum dark pipe circulating water desalination system according to claim 2, characterized in that: A vacuum gauge is installed on the water-gas separation tank.

4. A vacuum dark pipe circulating water desalination system according to claim 2, characterized in that: A vent head is provided on the top of the water-gas separation tank.

5. A vacuum dark pipe circulating water desalination system according to claim 4, characterized in that: A one-way valve is installed on the air bleed head.

6. The vacuum dark pipe circulating water desalination system according to claim 2, characterized in that: A stop valve is installed on the drain head.

7. The vacuum blind pipe circulating water desalination system according to claim 1, characterized in that: The water collection holes on the pipe body are arranged in several rows, and the angle formed by the line connecting two adjacent rows of water collection holes and the center of the pipe body is an acute angle.

8. The vacuum dark pipe circulating water desalination system according to claim 1, characterized in that: The diameter of the water collection hole is 0.02-0.05cm.

9. A vacuum dark pipe circulating water desalination system according to any one of claims 1 to 8, characterized in that: The outside of the pipe is covered with permeable geotextile.

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