Method for in-situ repairing of contaminated soil in arsenic slag field

An in-situ remediation and contaminated soil technology, applied in the field of soil pollution remediation of environmental technology, can solve problems such as time-consuming, large-scale engineering, and unsuitable for large-scale site remediation

Pending Publication Date: 2016-11-16
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The engineering volume of guest-soil method is relatively large, time-consuming and labor-intensive
The leaching method and the solidification / stabilization method did not completely remove the arsenic in the soil, which is likely to cause secondary pollution of the soil, and is not suitable for large-scale site restoration
Phytoremediation is generally time-consuming and can take decades
As an emerging in-situ repair technology, the electrokinetic repair method has the characteristics of simple operation, strong applicability, and short cycle. However, electrokinetic repair only migrates pollutants into the electrode solution and requires secondary treatment.

Method used

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  • Method for in-situ repairing of contaminated soil in arsenic slag field
  • Method for in-situ repairing of contaminated soil in arsenic slag field
  • Method for in-situ repairing of contaminated soil in arsenic slag field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A restoration method for removing arsenic in soil in situ, comprising:

[0086] (1) Take the naturally air-dried arsenic-contaminated soil, remove the sundries therein, pulverize it with a pulverizer, pass it through a standard sieve with a particle size of 0.50 mm, and set aside;

[0087] (2) Mix the above-mentioned soil to be used with 2:1 deionized water to make its moisture content 30%, stir it evenly and balance it for one day;

[0088] (3) Take the above-mentioned balanced soil in the soil sample chamber of the electric / PRB joint restoration device, and add 500 mesh filter cloths at both ends of the soil sample to prevent the soil from migrating to the cathode and anode chambers during the restoration process, and fill the cathode and anode chambers with electrolysis solution, the electrolyte uses 0.1mol / L KCl solution, and simultaneously adds a 0.005mol / L enhancement reagent EDTA solution to the cathode chamber.

[0089] (4) Insert the graphite electrode into th...

Embodiment 2

[0093] A restoration method for removing arsenic in soil in situ, comprising:

[0094] (1) Take the naturally air-dried arsenic-contaminated soil, remove the sundries therein, pulverize it with a pulverizer, pass it through a standard sieve with a particle size of 0.50 mm, and set aside;

[0095] (2) Mix the above-mentioned soil to be used with deionized water 1:1 to make the moisture content 25%, stir it evenly and balance it for one day;

[0096] (3) Take the above-mentioned balanced soil in the soil sample chamber of the electric-PRB joint restoration device, and place 400 mesh filter cloths at both ends of the soil sample to prevent the soil from migrating to the cathode and anode chambers during the restoration process, and fill the cathode and anode chambers with electrolysis Liquid, the electrolyte uses 0.05mol / L KCl solution, and simultaneously adds a concentration of 0.001mol / L enhancement reagent EDTA solution to the cathode chamber.

[0097] (4) Insert the graphite...

Embodiment 3

[0101] A restoration method for removing arsenic in soil in situ, comprising:

[0102] (1) Take the naturally air-dried arsenic-contaminated soil, remove the sundries therein, pulverize it with a pulverizer, pass it through a standard sieve with a particle size of 0.50 mm, and set aside;

[0103] (2) Mix the above-mentioned soil to be used with deionized water 3:1 to make the water content of 45%, stir well and balance for one day;

[0104] (3) Take the above-mentioned balanced soil in the soil sample chamber of the electric / PRB combined restoration device, and place 650 mesh filter cloths at both ends of the soil sample to prevent the soil from migrating to the cathode and anode chambers during the restoration process, and fill the cathode and anode chambers with electrolysis Liquid, the electrolyte uses 0.15mol / L KCl solution, and simultaneously adds a concentration of 0.1mol / L enhancement reagent EDTA solution to the cathode chamber.

[0105] (4) Insert the graphite electr...

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Abstract

The invention discloses a method for in-situ repairing of contaminated soil in an arsenic slag field. The method comprises the following steps that naturally-aired arsenic slag field arsenic contaminated soil is crushed and screened; the above soil is mixed with deionized water, the water content of the soil is 25%-45%, and stirring is conducted for achieving balancing; and joint repairing is conducted on the above balanced soil through the electric-PRB technology through an electrolyte and a strengthening reagent under the condition of pH being 5-7, wherein the medium of PRB is Fe0. According to the method, the electric repairing technology is utilized for being in joint usage with PRB, the advantages of the electric technology and the PRB technology can be combined, the removing efficiency of arsenic in the soil is improved, and the repairing time is short; a soil layer is not disturbed, and the method is suitable for soil with low permeability; and meanwhile, the arsenic can be recycled, secondary pollution can be effectively reduced, the subsequent treatment workload is reduced, and the economic benefits are increased.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation of environmental technology, and in particular relates to a method for in-situ remediation of soil contaminated by arsenic slag sites. Background technique [0002] Arsenic slag is a highly toxic solid waste. The main source is the discharge of arsenic-containing minerals during mining and smelting. It occurs concentrated in Xinjiang, Inner Mongolia, Hunan Province, Guangdong Province and other places. China's arsenic mineral resources account for about 70% of the world's total. In areas where arsenic-containing mines are active, the annual output of arsenic slag is about 50 tons. A large number of idle arsenic-containing slags that have not been harmlessly treated and piled up arbitrarily have caused arsenic to enter the nearby soil A large area of ​​soil was polluted with arsenic. Soil arsenic pollution has the characteristics of concealment, long-term and irreversible. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/085B09C2101/00
Inventor 孟凡生王业耀纪冬丽
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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