Quaternary underground water and soil pollution treatment method

Abstract

The invention belongs to the field of underground water and soil pollution treatment, and discloses a quaternary underground water and soil pollution treatment method. The method is mainly technically characterized by comprising the following steps: pollution boundaries are roughly presumed according to a ground pollution source, an underground water runoff direction and pollution time; exploratory holes are drilled, and the pollution boundaries are determined; testing recharge wells are constructed on the edge of a contaminated site, the underground water influence radius R of the recharge wells is tested, the recharge wells are drilled at the positions away from the outer side of the boundary of the contaminated site by the underground water influence radius R, and the interval between every two adjacent recharge wells is smaller than 2R; step4, a horizontal well is constructed, horizontal well spacing is not greater than the groundwater influence radius R, a horizontal well water filter pipe is constructed by clinging to the water-resisting layer surface according to the stratum condition and covers the whole polluted area in length; and a water storage tank is dug on the ground surface in the determined polluted area, and polluted water in the polluted area is pumped out through the horizontal well and treated while clean water is recharged into the recharge wells. The treatment is more thorough, and the damage of surrounding buildings caused by underground water level decline is avoided.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a method for treating quaternary groundwater and soil pollution. Background technique [0002] The Quaternary is the second period of the Cenozoic Era. The stratum formed in the Quaternary is called the Quaternary, and the Quaternary sediments are widely distributed. Except for the steep hillsides with exposed rocks, almost all parts of the world are covered by Quaternary sediments. The Quaternary sediments were formed relatively late, most of them were not cemented, and they were relatively well preserved. Quaternary deposits mainly include glacial deposits, fluvial deposits, lacustrine deposits, eolian deposits, cave deposits and marine deposits. Followed by ice-water deposits, residual deposits, slope deposits, flood deposits, biological deposits and volcanic deposits. [0003] Soil is the loose surface layer of the earth's land surface t...

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Problems solved by technology

[0012] Among them, the extraction treatment method is a very common method currently used. The existing extraction treatment method uses one or more vertical pumping wells. This method has the following defects: First, according to different areas, one or more vertical pumping wells are used. For water wells, due to the influence of groundwater influence radius R, not only the cost of drilling wells increases, but also there is a dead angle for treatment; if figure 1 As shown, it is a schematic diagram of the existing tube well pumping method to treat sewage, and the depth of the pumping well 1 cannot penetrate the aquifer 2

Because the depth of the reinjection well does not penetrate the water-resisting layer 2, during the precipitation pumping process, affected by the influence radius of the tube well, an unaffected area 3 is formed in the area near the lower part between two adjacent pumping wells. The polluted water is pumped out of the ground for treatment; secondly, when the polluted groundwater is pumped out, the water outside the polluted area is sucked in, and the groundwater level drops, causing the geological structure of the outside area to change, and in severe cases, it will collapse. When building, it is easy to cause accidents such as the collapse of buildings on the ground

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