SU1442607A1 - Method and apparatus for washing salinated soils - Google Patents

Abstract

The invention relates to the field of amelioration, in particular to soil desalinization. The purpose of the invention is to increase the washing efficiency and reduce its cost. When implementing the method, the vacuum pump 12 operates in the mode of pumping out water or air depending on the groundwater level (GWL). In this case, before the soil is flooded with water, groundwater is sucked through the drain. When lowering the groundwater table below the drain 6, the pump 12 sucks air out of the soil, increasing the free surface of the pores. 2 sp.f-ly, 1 ill.

Description

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The invention relates to land reclamation and can be used in flushing saline lands, draining wetlands, as well as maintaining the level of groundwater at the required depth.

The purpose of the invention is to increase the washing efficiency and reduce its cost.

The drawing shows the scheme of the proposed method.

The diagram shows: 1 - wash water; 2 - soil surface; 3 - saline soil layer; 4 - the initial level of groundwater; 5 - lower groundwater level. In the brine layer of soil, horizontal drainage 6 is laid with water and air-receiving connecting links 7. The mouth of the drain 6 is made with knee 8 directed to the bottom of the catchment well 9, the lower part of which is fitted with water-receiving holes 10. Centrifugal is installed at the well 1 and a vacuum pump 12, the drain pipes of which are connected to a common discharge manifold 13. The vacuum pump 12 is connected to the mouth of the drain pipe 14.

The method is as follows.

Both pumps are turned on: centrifugal 11 and vacuum 12. At the same time, the initial groundwater level decreases, the salted soil volume is dehydrated. By lowering the level of groundwater below the drain 6, a vacuum is created in it, under the action of which the pores of the adjacent volume of soil are freed from trapped air. The vacuum pump 12 draws air from the knee 8, increasing the influx of groundwater to the drain 6 and the catchment well and speeding up the process of reducing the initial level of groundwater.

Then to the soil surface serves wash water. Saturate the brine volume until the groundwater level closes with the washings. The drainage system is completely filled with water. Next, the water with dissolved salts is discharged by both pumps to the collector 13. After draining the water, the pump 12 operates in the vacuum mode. Wet soil vacuuming allows pred0

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to prevent the danger of the back migration of salts formed by evaporation of soil moisture containing dissolved salts, since due to the difference in pressure on the soil surface and inside its soil moisture with the remaining salt solutions in the pores, it moves into the soil from which it is removed by drainage.

Example. On the experimental plot for 10 days. the groundwater level has dropped below the drain line, i.e., to a depth of 3-5 m. Under the action of a vacuum pump, a vacuum is created in the soil, about 0 MPa. After that, wash water is supplied to the soil surface (in checks). The observation wells record the closure of the groundwater level with the wash water. Closure occurs within 5 days.

After the brine volume of the soil is saturated with washing water, it is pumped out within 45 days. At the end of the water supply for washing and washing for 5 days, the wet soil is evacuated.

Claims (2)

Invention Formula five 0 . A method of washing saline lands, including flooding the soil surface with water and draining the wash water with vacuum drains, characterized in that, in order to increase the washing efficiency and reduce its cost, before filling the soil surface, the ground water level is evacuated by draining the soil layer below the drainage level and the flooding of the soil surface is carried out until the washing water closes with the ground water, followed by the removal of the washing water. 2. A device for flushing saline lands containing a horizontal drain, a sump assembly, centrifugal and vacuum pumps, characterized in that the mouth of the drain is connected to a vacuum pump and provided with a bend directed towards the bottom of the well, made with water inlets.