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In-situ high-pressure rotary-spraying dosing oxidation-restoring method for organic contaminated site

A technology of organic pollution and high-pressure rotary spraying, which is applied in the field of soil remediation, can solve the problems of groundwater pollution diffusion and large grouting volume, and achieve the effects of small secondary pollution, overcoming common technical problems, and wide application of technology

Inactive Publication Date: 2018-08-07
CCCC TDC ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention does not set a water-stop curtain outside the boundary of the polluted site, and the amount of grouting is relatively large, which will easily lead to the spread of groundwater pollution

Method used

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  • In-situ high-pressure rotary-spraying dosing oxidation-restoring method for organic contaminated site

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An in-situ high-pressure rotary spraying and chemical-dosing oxidation restoration method for organic polluted sites uses high-pressure rotary spraying equipment to inject sodium persulfate solution activated by hydrogen peroxide into the polluted soil to realize in-situ oxidation and decomposition of organic pollutants. Process: Use mechanical equipment to level the organic polluted site, and set up a circle of cement mixing pile water-stop curtain 5m outside the boundary of the leveled organic polluted site. The bottom of the cement-mixing pile water-stop curtain is located on the first layer below the polluted soil 1.5m below the roof of the aquifer, the permeability coefficient of the water-stop curtain is 1.2×10 -7 cm / s; in the organic pollution site within the water-stop curtain range, arrange the drilling and dosing points with a spacing of 2m; then prepare activated sodium persulfate with a concentration of sodium persulfate of 100g / L and a concentration of hydro...

Embodiment 2

[0035] An in-situ high-pressure rotary spraying and chemical-dosing oxidation restoration method for organic polluted sites uses high-pressure rotary spraying equipment to inject sodium persulfate solution activated by hydrogen peroxide into the polluted soil to realize in-situ oxidation and decomposition of organic pollutants. Process: Use mechanical equipment to level the organic polluted site, and set up a circle of cement mixing pile water-stop curtain 10m outside the boundary of the leveled organic polluted site. The bottom of the cement-mixing pile water-stop curtain is located on the first layer below the polluted soil 3m below the roof of the aquifer, the permeability coefficient of the water-stop curtain is 6.8×10 -8cm / s; in the organic pollution site within the water-stop curtain range, arrange the dosing points of drill holes with a spacing of 4m; then prepare activated sodium persulfate with a concentration of sodium persulfate of 300g / L and a concentration of hydro...

Embodiment 3

[0037] An in-situ high-pressure rotary spraying and chemical-dosing oxidation restoration method for organic polluted sites uses high-pressure rotary spraying equipment to inject sodium persulfate solution activated by hydrogen peroxide into the polluted soil to realize in-situ oxidation and decomposition of organic pollutants. Technological process: use mechanical equipment to level the organic polluted site, and set up a circle of cement mixing pile water-stop curtain 6.5m outside the boundary of the leveled organic polluted site. 2m below the roof of the water-resistant layer, the permeability coefficient of the water-stop curtain is 4.9×10 -7 cm / s; in the organic pollution site within the water-stop curtain range, arrange the dosing points of drill holes with a spacing of 3m; then prepare activated sodium persulfate with a concentration of sodium persulfate of 200g / L and a concentration of hydrogen peroxide of 20g / L Solution, placed in the chemical solution storage tank, a...

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Abstract

The invention relates to an in-situ high-pressure rotary-spraying dosing oxidation-restoring method for an organic contaminated site and belongs to the technical field of soil restoration. The in-situhigh-pressure rotary-spraying dosing oxidation-restoring method comprises the following steps: 1) site leveling: adopting mechanical equipment to level the organic containated site; 2) construction of a water-stopping curtain: driving a circle of cement stirring piles as the water-stopping curtain; 3) distribution of drilling and dosing point positions: distributing the drilling and dosing pointpositions in the organic contaminated site; 4) fixed-point drilling: moving triple-tube high-pressure rotary-spraying equipment to the drilling point position, and drilling down to the design depth ofthe corresponding point position; 5) high-pressure rotary-spraying dosing: sinking a drilling rod, stopping drilling, starting a spraying pump to spray activated sodium persulfate solution, then rotatably lifting the drilling rod while spraying, and filling the activated sodium persulfate solution into the contaminated areas; 6) maintenance: carrying out closed maintenance for 25-40 days on the site. The in-situ high-pressure rotary-spraying dosing oxidation-restoring method has the advantages of large restoration depth, good restoration effect, simple process flow, low restoration cost and easy engineering application and the like.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to an in-situ high-pressure rotary spraying chemical addition oxidation repair method for an organic polluted site. Background technique [0002] With the adjustment of urban layout and the upgrading of industrial structure, a large number of chemical, petroleum, plastic, coking, thermal power, steel and other heavy polluting enterprises have been relocated or shut down, leaving a large number of organic pollution sites, which seriously hinder urban construction and local economic development. Organic pollutants are difficult to degrade in the natural environment, causing long-term pollution to soil and groundwater, which poses a great threat to human health. Therefore, the remediation of organic contaminated soil has become a hot issue in the soil remediation industry. The in-situ chemical oxidation remediation method has become the preferred method for the re...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 王琦杨健郎呼呼
Owner CCCC TDC ENVIRONMENTAL ENG