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Ultraviolet degradation method for soil polluted by polycyclic hydrocarbon

A technology for polluted soil and polycyclic aromatic hydrocarbons, which is applied in the field of degradation of polycyclic aromatic hydrocarbons polluted soil, can solve the problems of incomplete treatment, difficult control of conditions and high cost, and achieves the effects of easy operation, low cost and high efficiency

Inactive Publication Date: 2008-04-30
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 a methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample in a weight-to-volume ratio of 1:1, every 1000ml of polycyclic aromatic hydrocarbons The methanol solution contained 40mg of benzopyrene, pyrene or phenanthrene respectively, placed in a fume hood for 24 hours, and the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 40mg / kg.

[0017] Preparation of PAH methanol solution: Accurately weigh 0.04 g of benzopyrene, pyrene or phenanthrene, and dilute to 1000 ml with methanol respectively.

[0018] We...

Embodiment 2

[0022] Soil samples were air-dried indoors, ground, passed through a 0.45mm 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.

[0023] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: add a methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample in a weight-to-volume ratio of 1:1, every 1000ml of polycyclic aromatic hydrocarbons The methanol solution 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 40 mg / kg.

[0024] Preparation of PAH methanol solution: Accurately weigh 0.01 g of benzopyrene, pyrene or phenanthrene, and dilute to 1000 ml with methanol respectively. ...

Embodiment 3

[0029] Soil samples were air-dried indoors, ground, passed through a 0.25mm 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.

[0030] Preparation of polycyclic aromatic hydrocarbon-contaminated soil: add a methanol solution of polycyclic aromatic hydrocarbons (1 gram of soil: 1ml methanol solution of polycyclic aromatic hydrocarbons) to the above-mentioned sterilized soil sample in a weight-to-volume ratio of 1:1, every 1000ml of polycyclic aromatic hydrocarbons The methanol solution contained 40mg of benzopyrene, pyrene or phenanthrene respectively, placed in a fume hood for 24 hours, and the concentration of polycyclic aromatic hydrocarbons in the polluted soil was 40mg / kg.

[0031] Preparation of PAH methanol solution: Accurately weigh 0.04 g of benzopyrene, pyrene or phenanthrene, and dilute to 1000 ml with methanol respectively.

...

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Abstract

The invention relates to degradation of soil polluted by polycyclic aromatic hydrocarbon, specifically an ultraviolet light degradation method of soil polluted by polycyclic aromatic hydrocarbon, namely treating soil polluted by polycyclic aromatic hydrocarbon with ultraviolet light illumination. The method is specifically that spreading out polluted soil in a ware, and placing the two in an ultraviolet light illumination box for illumination degradation. The illumination conditions in the illumination box are ultraviolet light illumination wavelength 210-365nm, distance of sample to light source 5-20cm, light intensity 500-10000mu w / cm 2, temperature 25-35 DEG C, humidity in draft control box 30-50%, and illumination time 2-50 days, which is easy to operate. The invention is simple in treatment of removing polluted soil, low in cost, high in speed and efficiency. What is needed is only to conduct simple treatment of air dehydration to polluted soil and filtration, then to place a device with paved polluted soil under an ultraviolet light source for illuminating. The invention belongs to chemical degradation, and causes no secondary pollution, which is an environment-friendly method of treating polluted soil.

Description

technical field [0001] The invention relates to the degradation of polycyclic aromatic hydrocarbon-contaminated soil, in particular to an ultraviolet photodegradation method for polycyclic aromatic hydrocarbon-contaminated soil, which uses an ultraviolet light device to treat the polycyclic aromatic hydrocarbon-contaminated soil. 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.)...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 李培军张利红李雪梅
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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