Well irrigation and salt restraint device and method for drainage water recycling

Abstract

The invention discloses a well irrigation and salt restraint device and method for drainage water recycling, and belongs to the technical field of soil improvement. The device comprises a main well, an upper-layer pipe group and a lower-layer pipe group, wherein the main well comprises a water-permeable outer-layer well wall, a water-impermeable inner-layer well wall sleeving the outer-layer wellwall, and a water conveying layer between the outer-layer well wall and the inner-layer well wall. The upper-layer pipe group is communicated with the upper portion of the outer-layer well wall and ispermeable to water, the lower-layer pipe group is communicated with the lower portion of the inner-layer well wall, a near-well section of the lower-layer pipe group is impermeable to water, and a far-well section of the lower-layer pipe group is permeable to water. The upper-layer pipe group and the lower-layer pipe group are responsible for salt restraint and drainage water recycling respectively, the amount of water used for salt leaching can be reduced, and the loss of nutrient substances such as nitrogen and phosphorus is avoided; meanwhile, by means of drainage water recycling, the problem about irrigation water resources is solved, and salt-containing water obtained after salt leaching is treated. In conclusion, irrigation and salt leaching can be supplemented in a short term, theunderground water level can be reduced in a long term, salt accumulation of the high underground water level is blocked, and the dual purposes of irrigation and salt restraint are achieved.

Description

technical field [0001] The invention relates to the technical field of soil improvement, in particular to a well irrigation salt suppression device and method for reuse of drainage. Background technique [0002] my country is one of the countries with serious saline-alkali disasters, and harnessing and utilizing saline-alkali land is an important measure to ensure the growth of my country's grain production. In the process of harnessing and utilizing saline-alkali land, it is necessary to reduce the salt content of the saline-alkali land so that the saline-alkali land can meet the growth needs of crops. Therefore, it is necessary to provide an effective salt suppression method. [0003] The salt suppression process of the prior art on saline-alkali land is as follows: select the flushing plot, excavate the left open ditch and the right open ditch on both sides of the flushing plot, and set up an irrigation channel in the middle of the flushing plot; divide the left flushing...

AI Technical Summary

Problems solved by technology

[0005] On the one hand, the washing process consumes a lot of water, which is likely to cause a waste of scarce fresh water resources, and also needs to deal with a large amount of salt water obtained after salt washing

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