Method for circularly repairing organic polluted soil by cyclodextrin eluting solution

A technology of organic pollution and organic pollutants, applied in the restoration of polluted soil, etc., can solve secondary pollution and other problems, and achieve the effect of no secondary pollution, simple and easy method, and low-cost and easy-to-obtain raw materials

Inactive Publication Date: 2014-03-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid-liquid extraction method needs to use a large amount of organic solvent, which is easy to cause secondary pollution, and the pollutants transferred to the organic phase still need further treatment to finally eliminate the pollution

Method used

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  • Method for circularly repairing organic polluted soil by cyclodextrin eluting solution
  • Method for circularly repairing organic polluted soil by cyclodextrin eluting solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 10 g of organic polluted soil sample A to 500 mL of 100 μmol / L glycine-β-cyclodextrin eluent, place it in a constant temperature shaker at 250 rpm for 5 hours at 25 °C. After the elution was completed, the soil-elution solution mixture was poured into a centrifuge tube, and centrifuged at a speed of 4000rpm for 20min. The supernatant was transferred to a low-pressure mercury lamp direct photodegradation device, and the concentration of 2,4,6-trichlorophenol in the supernatant was measured by high performance liquid chromatography c 0 0.641mg / L, and the elution rate of 2,4,6-trichlorophenol in soil was 80.5%. Adopt high performance liquid chromatography to measure the concentration of 2,4,6-trichlorophenol under different reaction times, measure the concentration c of 2,4,6-trichlorophenol in the supernatant after light 20min t 0.007mg / L, for c 0 1%. Then, 10 g of organic contaminated soil sample A was added to the light-treated supernatant, and elution, centrifug...

Embodiment 2

[0025] In 500mL of 500μmol / L glycine-β-cyclodextrin eluent, add organic contaminated soil sample A to form a soil-elution mixture with an organic contaminated soil content of 40g / L, and place it at a constant temperature at 35°C Shake at 250rpm for 5h on a shaker. After the elution was completed, the soil-elution solution mixture was poured into a centrifuge tube and centrifuged at a speed of 4500rpm for 30min. The supernatant was transferred to a low-pressure mercury lamp direct photodegradation device, and the concentration of 2,4,6-trichlorophenol in the supernatant was measured by high performance liquid chromatography c 0 The elution rate of 2,4,6-trichlorophenol in soil was 1.21mg / L, and the elution rate was 76.0%. Adopt high performance liquid chromatography to measure the concentration of 2,4,6-trichlorophenol in the supernatant under different reaction times, record the concentration c of 2,4,6-trichlorophenol in the supernatant after light 60min t 0.026mg / L, for c ...

Embodiment 3

[0027] In 100mL of 100μmol / L natural β-cyclodextrin eluent, add organic contaminated soil sample B to form a soil-elution mixture with an organic contaminated soil content of 40g / L, and place it at a constant temperature at 15°C Oscillate for 0.5 h at a speed of 250 rpm in a shaker. After the elution was completed, the soil-elution mixture was poured into a centrifuge tube, and centrifuged at a speed of 3000rpm for 30min. Transfer the supernatant to a direct photodegradation device with a low-pressure mercury lamp, and measure the concentration of bisphenol A in the supernatant by high performance liquid chromatography c 0 was 9.48mg / L, and the elution rate of bisphenol A in soil was 50.0%. Adopt high performance liquid chromatography to measure the concentration of bisphenol A in the supernatant under different reaction times, record the concentration c of bisphenol A in the supernatant after light 90min t 0.41mg / L, for c 0 4.3%. Add organic contaminated soil sample B to ...

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Abstract

The invention discloses a method for circularly repairing organic polluted soil by a cyclodextrin eluting solution and belongs to the technical field of repairing of polluted soil. The method comprises the following steps: eluting the organic polluted soil by the cyclodextrin eluting solution and performing centrifugal separation to obtain liquid supernatant; irradiating the liquid supernatant by ultraviolet lights; and with the liquid supernatant as an eluting solution, repairing the organic polluted soil circularly. According to the method disclosed by the invention, organic pollutants in the eluting solution can be efficiently decomposed; meanwhile, the cyclodextrin eluting solution can be protected from being decomposed; the eluting solution and the organic pollutants can be separated without a special separation device or a special separation technology along the complete degradation of organic polluted substances so as to realize regeneration and recycling of cyclodextrin. The regenerated eluting solution still has a good effect of eluting the organic polluted soil. Furthermore, the method has the advantages of no secondary pollution, simplicity and feasibility in operation, simple equipment and the like.

Description

technical field [0001] The invention relates to a method for circularly repairing organic polluted soil by using cyclodextrin eluent, and belongs to the technical field of contaminated soil repair. Background technique [0002] Soil is "the foundation of life, the mother of all things". However, with the intensification of human activities, the soil environmental quality and its safety performance are decreasing day by day, so the remediation of polluted soil has become a research hotspot in environmental science. Currently, commonly used remediation techniques for contaminated soil include excavation, stabilization / solidification, soil elution, electrochemical treatment, thermal treatment, and bioremediation. Various methods have different scopes of application due to the limitations of soil properties, types of pollutants, timeliness and cost. Soil elution has received extensive attention due to its advantages of simple operation, high efficiency and short time consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 张旭冯仕祥李旋坤
Owner WUHAN UNIV
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