Solidifying stabilizing method for organic contaminated soil and application of solidifying stabilizing method to soil restoration

Abstract

The invention provides a solidifying stabilizing method for organic contaminated soil and application of the solidifying stabilizing method to soil restoration. The method comprises the steps that firstly, soil is crushed, plant residues and gravel are removed, and the maximum dry density and the optimal moisture content are measured; secondly, a liquid solidifying agent accounting for 0.005%-0.1% of the soil mass is scattered into the soil, and after stirring, laminating pre-curing is conducted for 20 h-30 h; thirdly, an organic adhesive accounting for 3%-10% of the soil mass and adsorbent accounting for 0.5%-3% of the soil mass are added in the pre-cured soil, and water is added to reach the optimal moisture content; fourthly, after stirring is conducted to be uniform, pressing forming is conducted, and a solidified body with the compaction degree being 95%-98% is obtained; and fifthly, after being covered with a film, the solidified body is placed in a standard curing box to be cured for 7-28 days. The method is used for restoring the organic contaminated soil, the solidifying stabilizing effect and low restoring cost are guaranteed, and meanwhile the usage amount of the inorganic adhesive and water can be greatly reduced; and the increased capacity of the solidified body obtained after treatment can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and relates to a method for treating organic polluted soil, in particular to a method for solidifying and stabilizing organic polluted soil with low increasing capacity and small water demand and its application in soil restoration. Background technique [0002] With the adjustment of my country's industrial structure and the acceleration of urbanization, a large number of chemical and pesticide production enterprises have been relocated, and many of the original land has been adjusted for residential or commercial use. These legacy sites have gathered a large number of organic polluted sites; Sudden environmental pollution accidents occur frequently, and a large amount of organic polluted soil has been cleaned up at the accident site. Organic pollutants stay in the soil or migrate in the air, water, and soil through volatilization, leaching, and diffusion, which will cause great ...

AI Technical Summary

Problems solved by technology

When solidifying and stabilizing organic polluted soil, the solidifying and stabilizing materials generally use inorganic adhesive materials such as cement and lime. Larger, which will increase the difficulty of subsequent disposal; in addition, the amount of water added during curing and stabilization is generally 30% to 50% of the total dry weight of solids. The amount of water added is large, which is contrary to the concept of green and sustainable restoration

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