A remediation method for soil polluted by chlorobenzenes

A technology of polluted soil and chlorobenzenes, which is applied in the restoration of polluted soil, etc., can solve the problems of oxidant instability, soil compaction, and affecting the restoration efficiency, etc., and achieve the improvement of oxidation performance, wide range of soil types, and easy reuse Effect

Inactive Publication Date: 2015-05-13
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on the removal of chlorobenzene pollutants in soil by selective chemical oxidation and the selection of the optimal ratio of oxidants are rarely reported.
[0005] According to the current national conditions of land demand in our country, the use of chemical oxidation technology to remediate organic contaminated soil has the advantages of high remediation effect and shorter remediation cycle than physical and biological remediation, but many oxidants are unst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] After 1kg (dry soil) of contaminated soil with a chlorobenzene pollution concentration of 50mg / kg was crushed and sieved, the water-soil mass ratio was 2:10 to adjust the water content. The chelating solution was prepared with citric acid and Fe(II) in a molar ratio of 3:1, the content of chlorobenzene in the sodium persulfate and the soil was set in a molar ratio of 300:1, and the dosage was set with sodium persulfate, citric acid, Fe(II) ) The molar ratio is 6:3:1, that is, 0.133 mol of sodium persulfate, 0.066 mol of citric acid, and 0.022 mol of ferrous sulfate are used to prepare a solution according to the maximum dissolution rate. The chelating agent and the sodium persulfate solution were sprayed alternately, and the mixture was continuously and fully mixed and stirred, and the reaction was controlled at 20 °C. The reaction was carried out for 24 hours, sampling was carried out at 1, 3, 6, 9, 12, and 24 hours respectively, and the concentrati...

Example Embodiment

[0028] Example 2

[0029] After 1kg (dry soil) of contaminated soil with a 1,2-dichlorobenzene pollution concentration of 50mg / kg was crushed and sieved, the water content was adjusted with a water-soil mass ratio of 1.5:10. The chelating solution was prepared with citric acid and Fe(II) in a molar ratio of 2.5:1, and the molar ratio of sodium persulfate and 1,2-dichlorobenzene in the soil was 200:1 to set the dosage, sodium persulfate, citric acid The molar ratio of Fe(II) is 5:2.5:1, that is, 0.068mol of sodium persulfate, 0.034mol of citric acid, and 0.0136mol of ferrous sulfate are used to prepare a solution according to the maximum dissolution rate. The chelating agent and the sodium persulfate solution were sprayed alternately, and the mixture was continuously and fully mixed and stirred, and the reaction was controlled at 20 °C. The reaction was carried out for 24 hours, sampling was carried out at 1, 3, 6, 9, 12 and 24 hours respectively, and the concentration of chlo...

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Abstract

A remediation method for soil polluted by chlorobenzenes is disclosed. The method includes following steps of: 1) smashing the polluted soil, and adjusting the water content; and 2) spraying the soil with a sodium persulfate solution, spraying a Fe (II) citric acid chelate solution under the existence of sodium persulfate, and reacting to remove the chlorobenzene pollutants in the soil. By a manner of activating the sodium persulfate by the Fe (II) citric acid chelate, the chlorobenzene pollutants in the soil are removed by utilization of a strong oxidizing property of the sodium persulfate. The sodium persulfate is added into the soil through a spraying manner, and a chelating agent is sprayed under the existence of the sodium persulfate to activate the sodium persulfate, thus increasing the oxidizing and removing rate of the chlorobenzene pollutants by an oxidant. The method is advantageous in that: the method is simple in operation and good in removing effects, a remediation process has no influence on physical and chemical properties of the soil, and the method is free of secondary pollution.

Description

technical field [0001] The invention relates to a method for removing chlorobenzenes in soil by chemical oxidation. Background technique [0002] Chlorobenzenes (CBs) are a class of monocyclic aromatic compounds, among which chlorobenzene and 1,2-dichlorobenzene are chemical raw materials, organic synthesis intermediates and organic solvents widely used in chemical, pharmaceutical, leather and other industries. Chlorobenzene and 1,2-dichlorobenzene are highly irritating and can enter the human body through various channels, causing serious damage to the intestinal tract, liver and kidneys. Because of their strong toxicity and refractory properties, they have been listed as my country's 68 kinds of environmental priority control pollutants blacklist. Because it is widely used in many industries, it has become one of the main pollutants in the sites left by these relocated chemical companies. According to relevant studies, such pollutants have seriously exceeded the standard ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 席北斗虞敏达马研何小松高如泰檀文炳李丹
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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