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Engineering remediation method for cyanide contaminated soil

A technology for polluted soil and cyanide, applied in the field of soil remediation, to achieve the effect of reducing dosage, reducing treatment cost and high oxidation efficiency

Inactive Publication Date: 2020-07-14
TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to overcome the difficulties of the prior art and provide a soil remediation technology suitable for large and medium-sized cyanide-contaminated sites, so that it can efficiently and quickly solve the problem of cyanide-contaminated soil remediation with less manpower input , and can achieve the purpose of repairing and reusing

Method used

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  • Engineering remediation method for cyanide contaminated soil
  • Engineering remediation method for cyanide contaminated soil
  • Engineering remediation method for cyanide contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The cyanide-contaminated soil was treated with different dosages of oxidants.

[0024] Sodium persulfate is selected as the oxidizing agent, and the oxidizing agent is activated by alkali activation. First, quicklime is used to adjust the pH of the cyanide-contaminated soil to about 10, so as to activate the oxidant while ensuring an alkaline environment and avoid the generation of hydrogen cyanide gas. Secondly, different proportions of oxidants were added to the polluted soil with a cyanide concentration of 60-70 mg / kg. The dosage ratios were 2%, 3%, and 4%, respectively. After adding the oxidants, they were cured for 4d, 10d, and 14d respectively.

[0025] When the dosage of sodium persulfate is 2%, the concentration of cyanide in the soil drops to about 11.99mg / kg, and the removal rate is about 81.5%; when the dosage of sodium persulfate is 3%, the concentration of cyanide in the soil drops to 8.94mg / kg, the removal rate is about 86.4%; when the dosage of sodium p...

Embodiment 2

[0027] In order to verify the effect of chemical oxidation in the process of engineering implementation, a pilot test of oxidation technology was carried out, with a test scale of 2m 3 Contaminated soil / batch. Investigate the stability of oxidation in the process of large-scale implementation.

[0028] Pilot reagent: sodium persulfate (industrial grade); dosing amount: 3% (mass ratio); reaction time: 7 days.

[0029] Use a mechanical sieving and crushing bucket excavator to sieve the contaminated soil and use a chemical spraying device to spray the contaminated soil; after spraying, cover the contaminated soil and let it stand, and take soil samples after the reaction time is reached to test.

[0030] After the polluted soil is pretreated by crushing, drying or mixing, the soil particle size is less than 10cm, and the moisture content is ≤20%, and it is sent to the hopper by the loader. The crushing process uses mechanical screening buckets. Use mobile multifunctional scre...

Embodiment 3

[0034] The oxidized soil with a cyanide concentration of about 12mg / kg is selected as a leaching equipment, and the corresponding leaching pilot test is carried out. During the pilot test, the total amount of cyanide in the soil sample, the unearthed soil sample, and the eluate and the amount of soil cyanide leachate were tested every day. The test results are shown in the following table:

[0035]

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Abstract

The invention provides a cyanide contaminated soil remediation technology, which is characterized in that a soil oxidation technology and a soil leaching technology are combined to treat moderate andsevere cyanide contaminated soil. An efficient oxidizing agent is selected, free radicals with high oxidation reduction potential are matched with a proper activation technology, a binding form of cyanide is destroyed, and a stable ferricyanide complexing state is converted into an easy-to-release state; then the cyanide in the easily released state is leached from the soil by utilizing a leachingtechnology to reach a remediation target value. The method can be applied to an engineering implementation process and has a good effect; in the remediation process, wastewater and waste residues aretreated, secondary pollution is prevented, and green remediation in the whole remediation process can be achieved; automation is achieved, and a large amount of manpower investment is not needed in the whole process.

Description

technical field [0001] The invention is mainly used for soil polluted by cyanide, has good effect on removing cyanide, is suitable for large-scale industrial application, and belongs to the technical field of soil remediation. Background technique [0002] With the rapid development of China's national economy and industrial transformation, as well as the release of a series of management policies such as "retire two and enter three", a large number of polluted sites have emerged. These sites are facing conflicts between pollution control and regional economic development to varying degrees, environmental pollution is likely to cause public incidents, and pollutants pose threats to the surrounding ecological environment and public health. At the same time, it has also given birth to China's contaminated site restoration industry. According to incomplete statistics from the Ministry of Environmental Protection, my country currently has an area of ​​more than 10,000 m 2 There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 袁珊珊宋震宇郑福居王旭东张宸曹立欣杨伟巢军委
Owner TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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