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Method of combined ultrasonic wave and surfactant to remediate ddts polluted soil

A surfactant and polluted soil technology, applied in the field of contaminated soil remediation, to achieve the effect of simple and easy remediation method, improving hard water resistance, and increasing effective concentration

Inactive Publication Date: 2018-02-02
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 a method for efficiently and quickly remediating DDTs-contaminated soil using ultrasonic waves and surfactants. The principle is to use ultrasonic Cavitation effect and solubilization of surfactants to remove DDTs from soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A certain amount of 4,4'-DDT was dissolved in dichloromethane solvent, added to the clean soil sample to prepare a DDT simulated contaminated soil sample with a concentration of 100 mg / kg, and fully stirred evenly. After the solvent evaporates, take 3g of soil and add it to a 50ml centrifuge tube, add 30ml of eluent (3g / L Tween 60, 1g / LSDS, 1.0g / LK 2 SiO 3 ). After closing the lid, place the centrifuge tube in an ultrasonic cleaner with an ultrasonic frequency of 60KHz, an ultrasonic output power of 300W, and process at 30°C for 30min. The treated samples were centrifuged (3000r / min, 5min) and then filtered, and the soil was ultrasonically treated with deionized water for 10min, centrifuged and filtered to obtain the repaired soil. The concentration of residual DDT in the soil was measured by gas chromatography, and the removal rate of DDT in the soil was 73.75%.

Embodiment 2

[0028] Formulate DDTs simulated polluted soil according to the method in embodiment 1, wherein 4,4'-DDT, 2,4'-DDT, 4,4'-DDD, 2,4'-DDD, 4,4'-DDE and 2 , the concentration of 4'-DDE was 20mg / kg. After the solvent evaporates, get 3g of soil and add it to the centrifuge tube, add 30ml of eluent (the concentrations of Tween 60 and SDS are 3g / L to 1g / L, K 2 SiO 3 The concentration is 1.0g / L). After closing the lid, place the centrifuge tube in an ultrasonic cleaner with an ultrasonic frequency of 60KHz and an ultrasonic output power of 500W, and process at 30°C for 30min. The treated samples were centrifuged (3000r / min, 5min) and then filtered, and the soil was ultrasonically treated with deionized water for 10min, centrifuged and filtered to obtain the treated soil. Using gas chromatography to measure the concentration of residual DDTs in soil, it is obtained that 4,4'-DDT, 2,4'-DDT, 4,4'-DDD, 2,4'-DDD, 4,4 The removal rates of '-DDE and 2,4'-DDE were 71.54%, 68.24%, 72.51%, 74...

Embodiment 3

[0030] The DDTs polluted soil is the polluted soil of a closed pesticide production plant in China, and the polluted time has been more than 20 years. It has been determined that the concentration of DDTs that can be extracted with n-hexane in the soil is 73.08mg / kg, including DDT, DDD and DDE. Take 3g of air-dried and ground and sieved soil into a centrifuge tube, add 30ml of eluent (3g / L Tween 60, 1g / LSDS, 1.0g / LK 2 SiO 3). After closing the lid, place the centrifuge tube in an ultrasonic cleaner with an ultrasonic frequency of 80KHz, an ultrasonic output power of 500W, and process at 30°C for 30min. Considering the long history of pollution and the close combination of DDTs and soil particles, the soil after ultrasonic treatment was centrifuged (3000r / min, 5min), separated from mud and water, and then replaced with new eluent and treated once in the same way. Then, the soil was ultrasonically cleaned with deionized water for 10 minutes, centrifuged and filtered, and the ...

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Abstract

The invention discloses a method for repairing DDTs-contaminated soil jointly with ultrasonic waves and surfactants. The steps are as follows: 1. Remove stones and rhizome impurities from the DDTs-contaminated soil, grind and sieve the DDTs-contaminated soil after air-drying; Pour the contaminated soil into a centrifuge tube; 3. Place the centrifuge tube in an ultrasonic cleaner for ultrasonic treatment; 4. After stopping the ultrasonic treatment, put the centrifuge tube into a centrifuge for centrifugation to remove the supernatant; Replace the eluent with deionized water and perform ultrasonic treatment under the same conditions to remove the eluent components remaining in the soil; 6. Clean soil is obtained after centrifugation and filtration, and the soil is naturally air-dried and used for backfilling of contaminated sites. The soil remediation method is simple and easy to implement, with low equipment requirements, low energy consumption, and convenient operation. It is not only suitable for the elution and remediation of DDTs-contaminated soil, but also has a good elution and removal effect on other organic pollutants in the soil. , a wide range of applications.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and relates to a method for remediating pesticide DDTs polluted soil by using ultrasonic waves and surfactants. Background technique [0002] Due to the characteristics of high efficiency, broad spectrum and low cost, DDTs have been widely used in the control of crop pests in my country since the 1950s. In 1983, my country stopped the large-scale production and agricultural use of DDTs, and only retained a small amount of production as an intermediate for dicofol, an antifouling paint additive and for disease control. Over the past 50 years, the cumulative production of DDTs in my country has reached more than 400,000 tons. Due to the stable chemical properties, long residual period, and extremely difficult to decompose in the environment, DDTs are still detected in a certain concentration in the environment in various parts of my country, posing a potential threat to the sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/02B09C1/08
Inventor 肖鹏飞杨蕊吴德东
Owner NORTHEAST FORESTRY UNIVERSITY
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