A method for remediating organic pollution sites by two-way stirring and injection method

Abstract

The invention discloses a method for remedying an organism contaminated field by using a bidirectional stirring injection method. The method comprises the following steps: (1) flattening the contaminated field; (2) performing shallow layer ground hardening; (3) staking out in survey; (4) locating bidirectional stirring equipment in place; (5) moving a drilling rod of the bidirectional stirring equipment; (6) performing pre-stirring drilling; (7) drilling a drill rod, injecting a medicine and stirring bidirectionally, namely, injecting the medicine through an inner tube of a conveying pipeline, injecting a mixed solution of a catalyst and a buffer agent from a pipeline between the inner tube and the outer tube of the conveying pipeline, and mixing and stirring the medicine, the catalyst, the buffer agent and soil at the bottom of the conveying pipeline; (8) lifting up the drill rod through opposite stirring; and (9) moving the drill rod to a next pile site, and repeating the step (5) to (8) until the soil in all pile sites is remedied. By adopting the method, the loss of ground mixed medicines can be reduced, the reaction velocity and the reaction time can be effectively controlled, the problem that grout spills out and turns up from the ground surface can be effectively solved, and the remediation efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical fields of civil engineering and environmental geotechnical engineering, and specifically relates to a method for repairing organic pollutant-contaminated sites using a two-way stirring injection method, and is especially suitable for in-situ repairing of organic pollutant sites whose soil pollution depth does not exceed 20m . Background technique [0002] At present, the most common treatment method for organically polluted site soil is the excavation and landfill method (also known as the alien soil method). As a widely used physical treatment technology, this method excavates the soil contaminated by organic matter Excavated and separated from the original site, and after simple treatment (such as ex-situ incineration or solidification and stabilization), the treated contaminated soil is transported as a whole and buried in a designated place to achieve the purpose of removing pollutants, and then backfill the u...

AI Technical Summary

Problems solved by technology

However, this method obviously fails to achieve the purpose of removing pollutants in a real sense, but only transfers the pollutants as a whole; at the same time, for the restoration of a large-scale contaminated site, the manpower and material resources are huge, the cost is high, and the treatment It is also difficult to guarantee the source of shallow and large amounts of clean soil

In addition, the excavation and landfill method is also easy to damage the soil structure, resulting in a decline in soil fertility, and the heavy metal-contaminated soil transferred to a different place also needs to be isolated and sealed or solidified and stabilized, which further increases the cost and easily leads to the contamination of organic pollutants. release, transfer, causing new soil and groundwater pollution

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