Multi-layer in-situ agent injection method for contaminated site

Abstract

The invention discloses a multi-layer in-situ agent injection method for a contaminated site. The multi-layer in-situ agent injection method comprises the following steps that (1) an agent injection steel pipe is pressed to the first-stage depth in a soil body; a pipe sealing cover is arranged at an upper port of the agent injection steel pipe, a closed cavity is formed, and a remediation agent ispumped into the agent injection steel pipe to achieve remediation within the first-stage depth range; (2), the pipe sealing cover is dismantled, the agent injection steel pipe is lengthened through aconnecting pipe group and pressed to the second-stage depth in the soil body, the dismantled pipe sealing cover is closely installed at an upper port of the connecting pipe group, and the remediationagent is pumped into the agent injection steel pipe to achieve agent injection remediation within the second-stage depth range; and (3), repeated operation is conducted according to the step (2), andagent injection remediation within all stages of the depth range is completed in sequence by lengthening the agent injection steel pipe. The multi-layer in-situ agent injection method for the contaminated site has the advantages that the multi-layer in-situ agent injection method is convenient and easy to operate, and by lengthening the agent injection steel pipe through the connecting pipe group, multi-layer fixed-depth injection within the contamination depth range can be achieved from the shallower to the deeper.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a multi-level in-situ injection method for contaminated sites. Background technique [0002] With the rapid development of my country's industrialization, the soil environment is constantly being harmed by various pollutions. At the same time, the demand for remediation and treatment of polluted soil will increase. At present, the remediation and treatment technologies for contaminated soil samples can be divided into in-situ remediation and ex-situ remediation according to the disposal site. In-situ remediation technology is becoming a hot spot for future remediation technology choices due to its low cost, low energy consumption, and no secondary pollution. In-situ repair and treatment technologies mainly include heat treatment, chemical oxidation, multiphase extraction, biological methods, etc. Chemical oxidation technology has quick results an...

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Problems solved by technology

[0003] In the process of in-situ repair, due to the difference in the pollution depth of the repair site, the fixed-length drug injection pipe will increase the vertical distance of the drug injection for the shallow soil layer, which increases the difficulty of drug injection, and also causes the repair agent to be uneven. necessary waste

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