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Method of repairing organochlorine pesticide contaminated soil by combining elution of surfactant and Fenton-like oxidization

A technology for pesticide-contaminated soil and surfactants, which is applied in the field of contaminated soil remediation to achieve the effects of strong solubilization ability, reduced reduction opportunities, and simple and easy remediation methods.

Inactive Publication Date: 2016-11-09
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In response to the domestic demand for organic pesticide-contaminated site remediation technology, in order to improve the shortcomings of a single technology in soil remediation, the present invention provides an efficient and fast method for remediating organochlorine pesticide-contaminated soil using a combination of surfactants and Fenton-like reagents. Method, its principle is to use the solubilization and elution of surfactant and the Fenton-like oxidative degradation to remove organochlorine pesticides in soil together

Method used

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  • Method of repairing organochlorine pesticide contaminated soil by combining elution of surfactant and Fenton-like oxidization

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A certain amount of 4,4'-DDT was dissolved in dichloromethane solvent, added to clean soil samples to prepare DDT simulated contaminated soil with a concentration of 50mg / kg, and fully stirred evenly. After the solvent evaporates, take 5g of soil and add it to a 200ml Erlenmeyer flask, and add 40ml of eluent (3.0g / L Tween 60, 1.0g / L SDS). After capping, the Erlenmeyer flask was placed in an air bath constant temperature shaker, and treated at 200r / min and 30°C for 6h. The treated samples were centrifuged (3000r / min, 5min) and then filtered, and the soil was ultrasonically treated with deionized water for 10min, and filtered to obtain the treated soil. The concentration of residual DDT in the soil was measured by gas chromatography, and the elution removal rate of DDT in the soil under this condition was 74.8% (see Table 1).

[0027] Take 20ml of the above eluate in a conical flask, add 20mmol / L ferric nitrate and adjust the pH value to 5.0 with 10ml / L 30% H 2 o 2 Sol...

Embodiment 2

[0029] The difference between this example and Example 1 is: add 50ml of eluent (5.0g / L Tween 60, 1.0g / L SDS), shake for 8h, and change the catalyst to ferric sulfate. It was determined that under this condition, the elution removal rate of DDT in the soil was 82.1%, and the oxidation removal rate of DDT in the eluate reached 84.4% (see Table 1).

Embodiment 3

[0031] What present embodiment is different from embodiment 2 is: change catalyzer into ferric chloride. It was determined that the oxidation removal rate of DDT in the eluate reached 75.5% (see Table 1).

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Abstract

The invention discloses a method of repairing organochlorine pesticide contaminated soil by combining elution of a surfactant and Fenton-like oxidization. The method comprises the following steps: I, removing bulky impurities from the collected organochlorine pesticide contaminated soil, and grinding and sieving the soil after being air-fried; II, mixing an eluent with the contaminated soil; III, putting a mixed system in a constant temperature oscillator for oscillating elution away from light; IV, after oscillating elution, performing centrifugalization and filtering and separating an eluant, and replacing the eluent with deionized water in the soil for oscillating elution or ultrasonic elution; V, taking the eluant in a cone-shaped bottle, adding a catalyst and adjusting the pH value, and then adding an H2O2 solution and sodium citrate; and VI, after plugging the cone-shaped bottle, quickly putting the bottle in the constant temperature oscillator for oscillating treatment so as to remove most of organochlorine pesticides in the eluant by oxidative degradation. The soil repairing method is simple and feasible, low in energy consumption, convenient to operate and relatively wide in application range, and the requirements on equipment are not high.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated soil, and relates to a method for remediating organochlorine pesticide-contaminated soil by combining surfactant elution and Fenton-like reagent oxidation. Background technique [0002] Organochlorine pesticides such as DDTs, HHC, chlordane, and heptachlor have been widely used in the control of crop pests worldwide since the middle of the last century. Due to the stable chemical properties of organochlorine pesticides, they are not easy to degrade in nature, have high biological toxicity, and have a long residual period, so they are listed as priority compounds by the environmental protection departments of various countries. my country used to be one of the countries that used the largest amount of organochlorine pesticides. The cumulative production of DDTs in my country alone reached more than 400,000 tons. Although my country banned the use of this type of pesticide in ag...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 肖鹏飞吴德东孙丽军
Owner NORTHEAST FORESTRY UNIVERSITY