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Method for degrading polycyclic aromatic hydrocarbon in soil using ultraviolet light

A technology of polycyclic aromatic hydrocarbons and ultraviolet light, applied in the field of photodegradation, can solve problems such as difficult control of conditions, incomplete treatment, long cycle, etc., and achieve the effects of low cost, accelerated photodegradation, and easy operation

Inactive Publication Date: 2009-04-22
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many researches on the bioremediation of PAHs at home and abroad. Bioremediation has many advantages, but there are also some shortcomings, such as long cycle and difficult control of conditions, etc. Physical methods such as heating and rinsing are used to remove, which is expensive and incomplete.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The soil samples were air-dried indoors, ground, passed through a 1mm sieve, and sterilized twice by intermittent high-pressure steam (half an hour each time, at 121°C). After adding polycyclic aromatic hydrocarbons, they were air-dried for later use.

[0016] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: Add methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample at a weight-to-volume ratio of 1:1. The methanol solution of aromatic hydrocarbons contained 10 mg of benzopyrene, pyrene or phenanthrene respectively, and placed in a fume hood for 24 hours, the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 10 mg / kg.

[0017] Preparation of PAH methanol solution: Accurately weigh 0.01 g of benzopyrene, pyrene, and phenanthrene, and dilute to 1000 ml with methanol.

[0018] Dissolve 100 mg of humic acid in 2.0 ...

Embodiment 2

[0023] Soil samples were air-dried indoors, ground, passed through a 1mm sieve, and then intermittently sterilized by high-pressure steam twice (each time for half an hour, at 121°C). After adding polycyclic aromatic hydrocarbons, they were air-dried for later use.

[0024] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: Add methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample at a weight-to-volume ratio of 1:1. The methanol solution of aromatic hydrocarbons contained 40 mg of benzopyrene, pyrene or phenanthrene respectively, and placed in a fume hood for 24 hours, the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 40 mg / kg.

[0025] Preparation of PAH methanol solution: Accurately weigh 0.04 g of benzopyrene, pyrene and phenanthrene, and dilute to 1000 ml with methanol.

[0026] Dissolve 100mg of humic acid in...

Embodiment 3

[0031] Soil samples were air-dried indoors, ground, passed through a 1mm sieve, and then intermittently sterilized by high-pressure steam twice (each time for half an hour, at 121°C). After adding polycyclic aromatic hydrocarbons, they were air-dried for later use.

[0032] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: add methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil samples at a ratio of 1:1, add 40mg / 1000ml of benzene Pyrene, pyrene and phenanthrene were placed in a fume hood for 24 hours, and the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 40 mg / kg.

[0033] Preparation of PAH methanol solution: Accurately weigh 0.04 g of benzopyrene, pyrene and phenanthrene, and dilute to 1000 ml with methanol.

[0034] Dissolve 100mg of humic acid in 2.0ml of 0.1mol / l NaOH, dilute to 1000ml with distilled water as a ...

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PUM

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Abstract

The invention relates to photodegradation for polycyclic aromatic hydrocarbon contaminated soil, in particular to a method for degrading polycyclic aromatic hydrocarbon in soil by ultraviolet illumination. A humic acid is taken as a sensitizing agent, a mixture of contaminated soil and the humic acid is paved in a vessel and is placed into an ultraviolet illumination box for illumination gradation, the thickness of a soil layer is between 0.15 and 0.5 mm, and the adding amount of the humic acid is between 3 and 45 mg / kg soil; and illumination conditions in the illumination box are as follows: the wavelength of the ultraviolet illumination is between 210 and 365 nm, a sample is 5 to 20 cm away from a light source, the illumination intensity is between 500 and 10, 000 mu m w / cm<2>, the temperature is between 20 and 38 DEG C, the relative humidity in a ventilation control box is between 30 and 50 percent, and the illumination time is between 2 and 18 days. The method has the advantages of quick speed, high efficiency, easy operation, and no generation of secondary pollution.

Description

technical field [0001] The invention relates to the photodegradation of polycyclic aromatic hydrocarbons polluted soil, in particular to a method for degrading polycyclic aromatic hydrocarbons in soil by ultraviolet light using humic acid as a sensitizer Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants ubiquitous in the environment. There are two aspects to its source: natural source and man-made source. Natural sources are mainly forest and grassland fires, volcanic eruptions, synthesis of plants and microorganisms, among which synthesis of higher plants and microorganisms, and volcanic activity are the main factors that produce the background value of PAHs; artificial sources come from industrial production and processing (such as coke, carbon production of black and coal tar, refining and fractionation of crude oil and its derivatives, etc.), and incomplete combustion of organic matter. Among anthropogenic sources, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/176A62D101/20
Inventor 张利红李培军李雪梅陈忠林
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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