Elution and oxidative degradation integrated organic contaminated soil remediation device and method

A technology of oxidative degradation and organic pollution, applied in the field of contaminated soil remediation, to achieve the effect of convenient operation, improved desorption effect, and no secondary pollution

Inactive Publication Date: 2018-11-06
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In response to the domestic demand for remediation technology of organic polluted sites, in order to improve the deficiencies of existing remediation technologies, the present invention provides a remediation device and method for organic polluted soil that utilizes ultrasonic elution and activated persulfate oxidation. The cavitation effect improves the elution efficiency of organic pollutants in the soil, desorbs them into the liquid phase, and uses ultrasound as an activation factor to activate persulfate to produce strong oxidizing SO 4 - , to efficiently oxidize and degrade organic pollutants entering the liquid phase, and at the same time combine the degradation effect of ultrasonic waves to achieve the purpose of effectively removing pollutants in the soil

Method used

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  • Elution and oxidative degradation integrated organic contaminated soil remediation device and method

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Experimental program
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Effect test

Embodiment 1

[0032] use figure 1 Repair device shown. The eluent is composed of nonionic surfactant Tween80 and anionic surfactant sodium lauryl sulfate in a ratio of 1:1. Artificially prepare the organochlorine pesticide DDT to pollute the soil, and the concentration of DDT is 3.6mg / kg. Put the contaminated soil into the tank through the soil feed port, add an eluent with a concentration of 4.0g / L, turn on the ultrasonic device and mixer, set the ultrasonic power to 200W, the ultrasonic frequency to 100khz, and the stirring speed to 60 rpm, and continue to process for 2 hours Finally, add sodium persulfate solution, the molar ratio of added persulfate to DDT is 20:1, keep the water-to-soil ratio at 5:1, and continue the treatment for 2 hours. After the treatment, it was determined that the removal rate of DDT in the soil reached 78.1%, and the removal effect was good.

Embodiment 2

[0034] Artificially prepare polycyclic aromatic hydrocarbon naphthalene to simulate polluted soil, the concentration of naphthalene is 5.82mg / kg. Using the same device and treatment method as in Example 1 to treat the soil, it was determined that the removal rate of naphthalene in the soil after one treatment reached 84.6%, and the removal effect was good.

Embodiment 3

[0036] Five kinds of polycyclic aromatic hydrocarbons compound polluted soil of phenanthrene, naphthalene, pyrene, anthracene and acenaphthene are configured, and the total concentration in the soil is 7.73mg / kg. Using the same device and treatment method as in Example 1, it was determined that the total removal rate of polycyclic aromatic hydrocarbons in the soil after one treatment reached 70.3%, and the removal effect was good.

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Abstract

The invention provides an elution and oxidative degradation integrated organic contaminated soil remediation device and method. The remediation device comprises a tank body and a top plate; the tank body is provided with an overflow port, a water outlet and a soil outlet; the top plate is provided with a hole duct for allowing a liquid feeding pipe to be guided in, one side of the liquid feeding pipe is connected with a liquid storage tank, and the other side of the liquid feeding pipe enters the tank body though the hole duct; the top plate is provided with a soil feeding inlet, and a soil screen is arranged below the soil feeding inlet; the top plate is provided with a stirring motor, the stirring motor is connected with a stirring shaft, and the stirring shaft is provided with stirringpaddles; and the bottom of the tank body is provided with an ultrasonic generator. According to the elution and oxidative degradation integrated organic contaminated soil remediation device and method, the elution efficiency of organic pollutants in soil is improved through the cavitation effect of ultrasonic waves, the organic pollutants are decomposed and absorbed into liquid phases, and meanwhile, the ultrasonic waves serve as an activation factor to active persulfate so that high-oxidbillity SO4- can be generated; and the organic pollutants entering the liquid phases are subjected to efficient oxidative degradation, and through the degradation effect of the ultrasonic waves, the purpose of effectively removing the pollutants in the soil is achieved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a device and method for remediating organic polluted soil that integrates elution and oxidative degradation. Background technique [0002] In recent years, with the progress of urbanization, a large number of pesticide production plants, chemical plants and other enterprises have been closed or relocated one after another, leaving a large number of polluted sites, in which organic pollutants pollute the surrounding environment through migration and diffusion. During the secondary development of these sites, the organic pollutants remaining in the soil may become a "chemical time bomb" at any time, posing a serious threat to environmental safety and human health. The research and development is safe and efficient, and is applicable to the soil of our country's sites. Repair technology has become urgent. [0003] Soil remediation technology can be...

Claims

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Application Information

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