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Method for remediation of soil polluted by high-concentration organic matters

A technology of contaminated soil and remediation method, which is applied in the field of remediation of high-concentration organic matter-contaminated soil. It can solve the problems of pollutant concentration rebound, slow oxidation/reduction repair process, and low solubility of organic matter, achieving high removal rate, good remediation effect, The effect of simple disposal method

Active Publication Date: 2017-01-04
中节能大地(杭州)环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation / reduction removal of organic pollutants in the underground environment is actually a continuous desorption-dissolution-degradation process. Generally, the solubility of organic matter is low, and it is easy to adsorb on soil particles, especially organic matter, resulting in a slow oxidation / reduction restoration process. Prone to the problem of pollutant concentration rebound, thus providing an optimized remediation method for high concentrations of organic pollutants in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The present invention selects a polluted site of a pharmaceutical factory as the site for experiment implementation, and samples the polluted soil. The main organic pollutant in the site is chloroform, and the concentration of chloroform in the groundwater is 516000 µg / L. At the same time, there is also adsorption in the soil of the groundwater polluted area. chloroform pollution or even NAPL, the remediation target value is 500μg / L, and an area of ​​10m*10m is selected as the experimental area.

[0041] The specific implementation process of this embodiment is as follows:

[0042] (1) Design and construct 4 injection wells and 1 monitoring well in the experimental area;

[0043] (2) A total of 4 rounds of injections were performed, and the injection agents for each round were alkali-activated sodium persulfate, alkali-activated sodium persulfate, Fenton, alkali-activated sodium persulfate, and the first and fourth rounds of alkali-activated sodium persulfate. The conc...

Embodiment 2

[0051] The target of this embodiment is groundwater pollutants, and the groundwater pollutants are benzene series with a concentration of 585000 µg / L.

[0052] The specific implementation process of this embodiment is as follows:

[0053] (1) Design and construct 4 injection wells and 1 monitoring well in the site;

[0054] (2) A total of 3 rounds of injections were performed. The injection agents were Fenton, Tween 80, and alkali-activated sodium persulfate in sequence. The mass fraction of ferrous sulfate in the first round of Fenton reagent was 1%, the mass fraction of hydrogen peroxide was 20%, and the mass fraction of sulfuric acid was 5%. %, the mass fraction of Tween 80 reagent in the second round was 8%, the concentration of the third round of alkali-activated sodium persulfate agent was 10% by mass fraction of sodium hydroxide, and 20% by mass fraction of alkali-activated sodium persulfate.

[0055] The following changes in the concentration of benzene series occurre...

Embodiment 3

[0061] The target of this example is groundwater pollutants, and the pollutants in groundwater are mainly chlorinated hydrocarbons with a pollution concentration of 268000 µg / L.

[0062] The specific implementation process of this embodiment is as follows:

[0063] (1) Design and construct 4 injection wells and 1 monitoring well in the site;

[0064] (2) A total of 2 rounds of injections were performed. The injection agents were Tween 80 and nano-zero-valent iron in sequence. The mass fraction of Tween 80 reagent in the first round was 8%, and the concentration of nano-zero-valent iron in the second round was 20%.

[0065] After 2 rounds of injection, the concentration of chlorinated hydrocarbons changed as follows and the following conclusions can be drawn:

[0066] (1) The surfactant Tween 80 was used in the first round, and the concentration of chlorinated hydrocarbons in the groundwater increased to 359,000 µg / L after injection. The concentration increased to 133.96%;

...

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PUM

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Abstract

The invention relates to a method for remediation of soil containing high-concentration organic pollutants. According to the method, the solubility of the organic pollutants in a groundwater environment is improved by adding a solubilizing agent, or organic matters in the soil are consumed by adding a non-selective oxidizing agent, so that the adsorption capacity of the soil is lowered, the permeability of the soil is improved, the deabsorption of 'non-aqueous phase liquid' in a high-concentration pollution source area and adsorbed-state organic pollutants in the soil is promoted, and the 'non-aqueous phase liquid' and the adsorbed-state organic pollutants are dissolved into a water phase or the effects of deabsorption and solubilizing are improved by using both the non-selective oxidizing agent and the solubilizing agent; and a chemical oxidizing / reducing agent is added on the basis of deabsorption and solubilizing to further degrade dissolved-state organic pollutants, so that the purpose of remediation is achieved. According to the method, non-aqueous phase-state pollutants, soil absorbed-state pollutants and organic pollutants in groundwater can be treated effectively and quickly, the sources of the agents are wide, the treatment method is simple, the remediation effect is good, and the removal rate of organic pollutants is high.

Description

technical field [0001] The invention belongs to the technical field of restoration of polluted soil, and in particular relates to a method based on soil environment control and utilizing the principle of desorption solubilization-oxidation / reduction to complete the restoration of high-concentration organic matter polluted soil. Background technique [0002] At present, in the production and manufacturing industries, such as chemical industry, coking, pharmaceuticals, pigment synthesis, wood preservatives, plastic manufacturing, herbicide and insecticide manufacturing, mining industry, etc., a large amount of waste water containing toxic chemicals will be generated, which is improperly discharged , and eventually seriously pollute the soil and groundwater. [0003] As an economical and effective treatment method, the in-situ chemical oxidation / reduction method is widely used in soil and groundwater remediation. The commonly used oxidants for in-situ chemical remediation are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/002B09C1/08B09C2101/00
Inventor 童翼飞张文辉朱兴达费腾
Owner 中节能大地(杭州)环境修复有限公司
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