Method for remedying cyanide contaminated soil through alkali solution phase transfer technology

A contaminated soil and phase transfer technology, applied in the field of soil remediation, can solve problems such as cyanide-contaminated soil remediation, and achieve the effects of reducing environmental risks, efficient purification treatment, and reducing volatilization

Inactive Publication Date: 2017-11-03
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for the restoration of cyanide-contaminated soil by phase transfer of alkali solution, to solve the problem of restoration of cyanide-contaminated soil,

Method used

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  • Method for remedying cyanide contaminated soil through alkali solution phase transfer technology
  • Method for remedying cyanide contaminated soil through alkali solution phase transfer technology
  • Method for remedying cyanide contaminated soil through alkali solution phase transfer technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use potassium ferricyanide mold to mix soil A-1 to carry out the experiment (theoretical value of cyanide content is 100mg / kg, the measured value is 100.93mg / kg), and the alkali washing solution with pH of 13 is added at a solid-to-liquid ratio of 1:5, and after reacting for 0.5h , measure the content of cyanide in the supernatant lye after centrifugal separation, calculate this soil cyanide elution rate 95% according to formula (1), calculation result is as shown in table 1.

Embodiment 2

[0035] Use potassium ferricyanide model to mix soil A-2 to carry out the experiment (the theoretical value of cyanide content is 1000mg / kg, the measured value is 1057mg / kg), and the alkali washing solution with a pH of 13 is added at a solid-to-liquid ratio of 1:5, and after 0.5h of reaction, After centrifugal separation, measure the content of cyanide in the supernatant lye, calculate this soil cyanide elution rate according to formula (1) 51%, calculation result is shown in Table 1.

Embodiment 3

[0037] The soil A-3 was mixed with potassium ferrocyanide to carry out the experiment (the theoretical value of cyanide content is 100mg / kg, and the measured value is 105.55mg / kg), and the alkali washing solution with a pH of 13 is added at a solid-liquid ratio of 1:5, and the reaction is 0.5h Finally, measure the content of cyanide in the supernatant lye after centrifugal separation, calculate this soil cyanide elution rate according to formula (1) 93%, calculation result is as shown in table 1.

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Abstract

The invention discloses a method for remedying cyanide contaminated soil through an alkali solution phase transfer technology. The cyanide contaminated soil is used as a study object, cyanide (mainly iron-cyanide complex) is selected as a target contaminant, the manner of full contact of an alkali solution and cyanogen-containing soil is adopted, maximum-degree liquid phase transfer of soil cyanide can be efficiently and safely achieved by adjusting and controlling parameters such as the solution alkalinity, the solid-liquid contact time and the solid-to-liquid ratio, and the treated soil can reach the B-level standard 8mg/kg of the national Standard of Soil Quality Assessment for Exhibition Sites HJ350-2007. According to the method, the defects that in a cyanide direct oxidation method and other traditional methods, the efficiency of the treatment technology is low, and cyanide is removed not thoroughly are overcome; safe and efficient separation and removal of the cyanide are achieved; and powerful technical support is provided for comprehensive treatment and safe reutilization of a cyanide contaminated site.

Description

technical field [0001] The invention relates to a method for repairing cyanide-contaminated soil, in particular to a method for repairing cyanide-contaminated soil by using an alkali solution phase transfer technology, and belongs to the technical field of soil restoration. Background technique [0002] The "Soil Pollution Prevention and Control Action Plan" issued by the State Council in 2016 fully reflects the country's great importance to soil pollution prevention and control. Soil remediation is an important part of "soil pollution prevention and control". For different types of contaminated soils, developing cost-effective remediation technologies is an important measure to achieve the goal of soil pollution prevention and control. As an important class of soil pollutants, cyanide mainly comes from the discharge of cyanide-containing wastewater or waste residues from industrial enterprises. According to the latest environmental statistical annual report data, the top ...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 魏云梅刘夏瑜梅小霞刘艳琴杜玲石德智
Owner CHONGQING UNIV
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