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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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  • Description
  • Claims
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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 unstable and the dosage of chemicals in the soil remediation process is not enough. The uniformity, the choice of dosage for soil with different pollution levels, and the influence of different soil water contents on the effect of the agent all affect the remediation efficiency, and the improper selection of the agent and the dosage will seriously affect the performance of the treated soil, resulting in the soil after treatment. Compaction or soil loss of function cannot be reused

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After crushing and sieving 1 kg of contaminated soil (dry soil) with a concentration of chlorobenzene pollution of 50 mg / kg, the moisture content is adjusted using a water-to-soil mass ratio of 2:10. Citric acid and Fe(II) are formulated chelating solution in molar ratio 3:1, and sodium persulfate and chlorobenzene content in soil are set dosage as 300:1 in molar ratio, sodium persulfate, citric acid, Fe(II ) in a molar ratio of 6:3:1, that is, use 0.133mol of sodium persulfate, 0.066mol of citric acid, and 0.022mol of ferrous sulfate to form a solution according to the maximum dissolution rate. The chelating agent and the sodium persulfate solution are alternately sprayed, and the mixture is constantly mixed and stirred, and the reaction is controlled at 20°C. After reacting for 24 hours, samples were taken at 1, 3, 6, 9, 12, and 24 hours respectively. After the treatment, gas chromatography was used to analyze the concentration of chlorobenzene. As a result, the remov...

Embodiment 2

[0029] After crushing and sieving 1 kg of contaminated soil (dry soil) with a 1,2-dichlorobenzene pollution concentration of 50 mg / kg, use a water-to-soil mass ratio of 1.5:10 to adjust the moisture content. Prepare the chelation solution with citric acid and Fe(II) in a molar ratio of 2.5:1, and set the dosage of sodium persulfate and 1,2-dichlorobenzene in the soil at a molar ratio of 200:1. Sodium persulfate, citric acid , Fe(II) molar ratio is 5:2.5:1, that is, use 0.068mol of sodium persulfate, 0.034mol of citric acid, and 0.0136mol of ferrous sulfate to form a solution according to the maximum dissolution rate. The chelating agent and the sodium persulfate solution are alternately sprayed, and the mixture is constantly mixed and stirred, and the reaction is controlled at 20°C. After reacting for 24 hours, samples were taken at 1, 3, 6, 9, 12, and 24 hours respectively. After the treatment, gas chromatography was used to analyze the concentration of chlorobenzene. As a re...

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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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