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Method for restoring soil contaminated by poly-brominated diphenyl ether by combining solubilization of surface active agent and microwave irradiation technology

A surfactant and polybrominated diphenyl ether technology, applied in the field of surfactant solubilization combined with microwave irradiation technology to repair polybrominated diphenyl ether contaminated soil, can solve the problems of secondary pollution, strong adsorption, cost increase, etc., to achieve no secondary pollution, Enhanced solubility, easy-to-control effects

Inactive Publication Date: 2014-07-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the published patent "A method for remediation of decabromodiphenyl ether-contaminated soil" (CN 101733272A), the flakes of polypore bacteria and the soil polluted by decabromodiphenyl ether are evenly mixed at room temperature, and the decabromodiphenyl ether-contaminated soil is mixed by polypore bacteria. Although this method has a high degree of environmental friendliness and the treatment mechanism and methods are ecologically natural, PBDEs have low water solubility, are often strongly adsorbed by soil, and have low bioavailability, which greatly limits the degradation of PBDEs by microorganisms. Moreover, PBDEs have toxicity and inhibitory effects on microorganisms, and it is difficult to achieve a good treatment effect by relying on biological degradation alone.
The published patent "A Method for Degrading Polybrominated Diphenyl Ethers with Surfactant Solubilization Combined with UV Technology" (CN 101461989A), using ultraviolet light as a light source will increase the cost and is not suitable for engineering applications, and the photolysis process will generate polybrominated dibenzodiphenyl ethers Oxygens (PBDDs) and polybrominated dibenzofuras (PBDFs), causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Select 4,4'-dibromodiphenyl ether (BDE-15) as the research object, dissolve 500 mg of BDE-15 standard sample in 100 mL of n-hexane solution, add 1.5L of water, mix well, and then add 2500 g of kaolin , sealed and soaked for two weeks to prepare simulated soil samples contaminated by BDE-15. Two weeks later, the prepared simulated soil samples were air-dried naturally under laboratory conditions, and the BDE-15 content of the prepared BDE-15 contaminated simulated soil samples was 136.38 mg / kg.

[0018] Grind the contaminated soil through a 60-mesh sieve, seal it and store it in a desiccator for later use. Take 120 g of the simulated soil prepared by the above-mentioned kaolin in a conical flask, add a mixture of 10% octadecyldimethylammonium bromide and Ttiton X-100 (mass ratio: 7:3) of the contaminated soil mass, and put it under normal temperature. Under the condition of high pressure and dark, put the brown Erlenmeyer flask in the water bath ultrasonic device for so...

Embodiment 2

[0020] Select 4,4'-dibromodiphenyl ether (BDE-15) as the research object, dissolve 500 mg of BDE-15 standard sample in 100 mL of n-hexane solution, add 1.5L of water, mix well, and then add 2500 g of kaolin , sealed and soaked for two weeks to prepare simulated soil samples contaminated by BDE-15. Two weeks later, the prepared simulated soil samples were air-dried naturally under laboratory conditions, and the BDE-15 content of the prepared BDE-15 contaminated simulated soil samples was 136.38 mg / kg.

[0021] Grind the polluted soil through a 60-mesh sieve, build a soil heap for treatment, the height of the soil heap should not be higher than 0.3m, lay a plastic film underneath to prevent leakage, and add 10% cetyl dimethyl bromide of the polluted soil mass A mixture of ammonium and lauryl polyglycol ether (mass ratio 7:3).

[0022] Add water to the contaminated soil mixed with surfactant, and adjust the pH value of the soil system to 8-9 with 1mol / L NaOH solution, stir and s...

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PUM

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Abstract

The invention discloses a method for restoring soil contaminated by poly-brominated diphenyl ether by combining solubilization of a surface active agent and a microwave irradiation technology. The method comprises the steps of feeding a gemini / traditional mixed surface active agent into the soil contaminated by the poly-brominated diphenyl ether, and carrying out microwave irradiation. After the surface active agent is used, hydrophobic organic contaminant can be easily dissolved; the contaminant in the soil can be enriched, fixed or destroyed by the microwave irradiation technology; therefore, the aim of treating the contaminant in the soil can be achieved. The method is simple, efficient, easy to control and free from secondary pollution; after the method is used, the target contaminant can be selectively degraded, the surface active agent is hardly influenced, and a necessary precondition is provided for recycling the surface active agent solution.

Description

technical field [0001] The invention belongs to the technical field of halogenated aromatic organic pollutant treatment for environmental protection, and relates to a method for repairing polybrominated diphenyl ether-contaminated soil by combining surfactant solubilization with microwave irradiation technology. Background technique [0002] Polybrominated diphenyl ethers (PBDEs) are an important class of brominated flame retardants, which are widely used in plastics, textiles, electronic appliances and fireproof materials. PBDEs are hydrophobic, persistent and bioaccumulative, easy to adsorb in particulate matter and soil, and can migrate long distances in the environment. PBDEs can diffuse through volatilization, seepage, etc., and finally enter the soil. Recent studies have confirmed that this type of toxic bromide can interfere with thyroid hormones and hinder the normal development of the brain and central nervous system of humans and animals, and its health hazards ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/06
Inventor 叶丹解清杰沈彬
Owner JIANGSU UNIV
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