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An in-situ remediation method for deep heavy metal-contaminated soil

A technology for in-situ remediation of polluted soil, applied in the restoration of polluted soil, etc., can solve the problems of large amount of slurry returning, poor treatment effect of heavy metals, difficult in-situ treatment, etc., and achieve high utilization efficiency, excellent treatment effect, and treatment short cycle effect

Active Publication Date: 2017-12-15
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the existing heavy metal-contaminated soil, especially the deep-layer soil, which has poor heavy metal treatment effect and is difficult to treat in-situ
In addition, another purpose of the present invention is to solve the defects of excessive slurry return, secondary pollution risk and high treatment cost in the heavy metal treatment process

Method used

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  • An in-situ remediation method for deep heavy metal-contaminated soil
  • An in-situ remediation method for deep heavy metal-contaminated soil
  • An in-situ remediation method for deep heavy metal-contaminated soil

Examples

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Embodiment 1

[0053] This embodiment is a treatment project of a city's historical waste residue site, and the process flow is as follows figure 1 As shown, the specific steps are as follows:

[0054] Step (1) This embodiment is aimed at a historical waste residue site, the pollutants are 6-14m below the surface, and the area is about 20000m 2 , the amount of contaminated soil is about 100,000 tons, and the amount of off-site treatment is too large. After sampling and testing, it is Class II industrial solid waste. The main heavy metals that exceed the standard are lead and zinc. The concentration of lead in the sample water is 5.6mg / L, and zinc is 2.78mg / L. The requirement is that the leaching solution after treatment should meet the "Comprehensive Discharge Standard for Sewage GB8978-1996".

[0055] Step (2) After systematic geological exploration and sampling inspection, site leveling and pile testing, the double-pipe rotary spraying method is adopted for construction, and the process ...

Embodiment 2

[0060] Mine tailings treatment in a certain city, the process is as follows figure 1 As shown, the details are as follows:

[0061] (1) This example is aimed at the mine tailings site of a lead mine in a certain city. Due to irregular mining behaviors many years ago, the mining tailings were illegally dumped into a valley near the mine without reasonable disposal, with a total of 60,000 cubic meters. The environment has had an extremely bad impact. After sampling and testing, the main pollutants are lead, zinc, copper, and cadmium. After the treatment, the industrial solid waste reaching Class I will be closed in situ for disposal.

[0062] Step (2) After systematic geological exploration and sampling testing, site leveling and pile testing, the three-pipe rotary spraying method is adopted for construction. The process parameters are: slurry pressure is 20-25MPa, compressed air pressure is 0.7-0.8MPa, and high-pressure water pressure is 40~45MPa, rotation speed 5~10r / min, l...

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Abstract

The invention discloses an in-situ remediation method for deep heavy metal contaminated soil. According to the in-situ remediation method, grout containing a heavy metal remediation agent and a curing agent is rotationally sprayed into the deep heavy metal contaminated soil through a high pressure jet grouting pile grouting method, and hen heavy metal in the contaminated soil is immobilized or inversed. According to the in-situ remediation method, the high pressure jet grouting pile grouting method is creatively adopted to treat the heavy metal contaminated soil, and the deep heavy metal contaminated soil treatment problem which technicians wants to solve all the time in the heavy metal contaminated soil treatment field is solved. Compared with existing injection methods, surface spraying methods and the like, the in-situ remediation method achieves that the heavy metal contaminated soil layer being over 5m away from the earth surface or the heavy metal contaminated soil layer in certain waste residue sites left over by history can be effectively treated; and besides, large-scale excavation and transfer of in-situ contaminated soil are not needed, and in-situ treatment on the contaminated site can be achieved, wherein during ex-situ remediation work, a large amount of heavy metal contaminated soil needs to be transferred.

Description

technical field [0001] The invention relates to a soil repair process, in particular to an in-situ repair method for deep heavy metal polluted soil. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation and the use of products with heavy metals exceeding the standard. Due to human activities, the content of heavy metals in the environment increases, which exceeds the normal range, directly endangers human health, and leads to the deterioration of environmental quality. Heavy metal pollution is different from the pollution of other organic compounds. Many organic compounds can be purified physically, chemically or biologically in nature to reduce or eliminate their harmfulness. However, heavy metals are enriched and difficult to degrade in the environment. If it exceeds the limit that the human body can tole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 贺治国张练军罗文连蒋燚史卫华
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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