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Method for repairing soil seriously polluted by polycyclic aromatic hydrocarbon by utilizing plants

A technology for polycyclic aromatic hydrocarbons and phytoremediation, applied in the restoration of contaminated soil, etc., can solve problems such as difficulty in implementation and difficulty in the survival of microorganisms, and achieve the effects of short restoration time, enhanced ability of roots to degrade petroleum hydrocarbons, and low price

Active Publication Date: 2016-04-13
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the concentration of polycyclic aromatic hydrocarbons in the soil is too high, it is difficult for microorganisms in the soil to survive, and the growth of most plants will also be inhibited, and the existing bioremediation methods are difficult to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In an abandoned coking plant, the concentration of polycyclic aromatic hydrocarbons in the soil is 0.2g / kg, and the pollution area is 100m 2 . Plant cocklebur seedlings with a height of about 10cm in the PAH-contaminated soil of the abandoned coking plant above, with a planting density of 100-200 plants / m 2 . At the same time, 10 L of sodium selenite solution with a concentration of 1.2 μmol / L was prepared and sprayed on the leaves of cocklebur seedlings once every 10 days for a total of 2 months. When cocklebur grows to the seed stage, the plants are removed and harmlessly treated, and this is repeated until the content of polycyclic aromatic hydrocarbons in the soil reaches the environmental safety standard.

Embodiment 2

[0015] In an abandoned coking plant, the concentration of polycyclic aromatic hydrocarbons in the soil is 0.2g / kg, and the pollution area is 100m 2 . Plant the seedlings with a height of about 5cm in the PAH-contaminated soil of the abandoned coking plant above, with a planting density of 100-200 plants / m 2 . At the same time, 10 L of sodium selenite solution with a concentration of 1.2 μmol / L was prepared, and sprayed on the leaves of the annual poncho seedlings, once every 10 days for a total of 2 months. When the annual pomegranate reaches the mature stage, the plants will be removed and harmlessly treated, and this will be repeated until the content of polycyclic aromatic hydrocarbons in the soil reaches the environmental safety standard.

Embodiment 3

[0017] In an abandoned coking plant, the concentration of polycyclic aromatic hydrocarbons in the soil is 0.2g / kg, and the pollution area is 100m 2 . Plant the seedlings of ghost needles with a height of about 5cm in the PAH-contaminated soil of the above abandoned coking plant, and the planting density is 100-200 plants / m 2 . At the same time, 10 L of sodium selenite solution with a concentration of 1.2 μmol / L was prepared, and the foliage spraying was carried out on the seedlings of P. japonica, once every 10 days for a total of 2 months. When the ghost needle grass reaches the mature stage, the plants are removed and treated harmlessly, and this is repeated until the content of polycyclic aromatic hydrocarbons in the soil reaches the environmental safety standard.

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Abstract

The invention relates to a method for repairing soil seriously polluted by polycyclic aromatic hydrocarbon by utilizing plants. The method comprises the specific steps that plant seedlings are planted on the soil polluted by high-concentration polycyclic aromatic hydrocarbon, leaf surface spraying is carried out on the plant seedlings with sodium selenite solution with a certain concentration every 10 days to 15 days, and spraying lasts for 2-3 months; and when the plants grow to be mature, the plants are pulled out, innocent treatment is carried out, and the processes are repeatedly executed till the content of the soil polycyclic aromatic hydrocarbon reaches the safety environment standard. The pollution tolerance of the plants to the high-concentration polycyclic aromatic hydrocarbon in the soil can be improved, the plants are promoted to absorb polycyclic aromatic hydrocarbon, the repairing time is short, and the plant repairing effect is improved. Due to the fact that industrial sodium selenite is cheap, the cost for treating the soil polluted by the high-concentration polycyclic aromatic hydrocarbon is lower, and the higher actual application value is achieved.

Description

technical field [0001] The invention relates to a plant remediation method for severe polycyclic aromatic hydrocarbon pollution based on applying selenium to plant leaves. Specifically, a certain amount of selenium is applied to plant leaves to improve the plant's ability to absorb high-concentration polycyclic aromatic hydrocarbon pollution in soil. Background technique [0002] Polycyclic aromatic hydrocarbons (polycyclic aromatic hydrocarbons, PAHs) are volatile hydrocarbons produced by incomplete combustion of coal, petroleum, wood, tobacco and organic polymer compounds, and are important environmental pollutants. Polycyclic aromatic hydrocarbons are widely distributed in the environment, and have great potential harm to human health and the ecological environment. Biorefractory, with the gradual deepening of human understanding of the environment, the remediation of polycyclic aromatic hydrocarbons has become a global concern. More than 90% of polycyclic aromatic hydro...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 黄应平黄珏英刘慧刚宋宜枝
Owner CHINA THREE GORGES UNIV
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