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A method for remediating polycyclic aromatic hydrocarbon-contaminated soil with rush grass

A technology for polycyclic aromatic hydrocarbons and polluted soil, applied in the restoration of contaminated soil, etc., can solve problems such as polycyclic aromatic hydrocarbons soil pollution, achieve good environmental restoration effects, improve soil fertility, and improve soil structure

Active Publication Date: 2021-09-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of polycyclic aromatic hydrocarbon soil pollution, the present invention provides a method for repairing polycyclic aromatic hydrocarbons by using rush grass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The selected object is the soil around a certain iron and steel plant, and a 5m×5m plot is selected. The land in the plot is broken and plowed, and the ground is leveled with a distance of 6cm to transplant rush seedlings. The content of polycyclic aromatic hydrocarbons in the soil is measured, and the harvested aerial parts are harmlessly treated. In the coming year, replant according to the growth of rushes, and repeat the above steps. After one year of phytoremediation, the total content of polycyclic aromatic hydrocarbons in the soil was reduced by 11.5%, after two years of phytoremediation, the content of polycyclic aromatic hydrocarbons in the soil was reduced by 33%, and after three years of phytoremediation, the total content of polycyclic aromatic hydrocarbons in the soil was reduced by 50%.

Embodiment 2

[0034] The object to be selected is the soil around a certain coal-fired field, and a plot of 5m×5m is selected. The land in the plot is broken and plowed, and the ground is leveled, with a distance of 6cm to transplant rush seedlings. After the plants mature, the aboveground part is harvested, leaving 3cm of stubble. The content of polycyclic aromatic hydrocarbons in the soil was also measured, and the harvested aerial parts were harmlessly treated. In the coming year, replant according to the growth of rushes, and repeat the above steps. After one year of phytoremediation, the total content of polycyclic aromatic hydrocarbons in the soil was reduced by 20.2%, after two years of phytoremediation, the content of polycyclic aromatic hydrocarbons in the soil was reduced by 30.4%, and after three years of phytoremediation, the total content of polycyclic aromatic hydrocarbons in the soil was reduced by 46.83%.

Embodiment 3

[0036] The selected object is the soil around a certain urban area, and a 5m×5m plot is selected. The land in the plot is broken and plowed, and the ground is leveled, with a distance of 6cm to transplant rush seedlings. The content of polycyclic aromatic hydrocarbons in the soil, the above-ground parts harvested for harmless treatment. In the coming year, replant according to the growth of rush grass, and repeat the above steps. After one year of phytoremediation, the total content of polycyclic aromatic hydrocarbons in the soil is reduced by 16.3%. After two years of phytoremediation, the content of polycyclic aromatic hydrocarbons in the soil is reduced by 32.7%. After remediation, the total content of PAHs decreased by 59.2%.

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Abstract

The invention discloses a method for repairing polycyclic aromatic hydrocarbon-contaminated soil by rushes. The method comprises the following steps: 1) land preparation: crushing and tilling the land in the polluted area; 2) planting: sowing rush seeds or transplanting rush seedlings 3) Management: When the seeds are mature, harvest the grass seeds of rushes, leave the stubble and harvest the above-ground parts, retain the underground parts, and remove the harvested above-ground parts from the plot for harmless treatment; 4) Replanting: according to the survival rate of rushes Carry out replanting; 5) Regularly detect the content of PAHs in the soil, and repeat steps 3-6 until the content of PAHs meets the requirements, then the cycle can be stopped. The invention uses rush for the remediation of polycyclic aromatic hydrocarbon soil pollution without special management, is simple, easy and effective, has no secondary pollution, and can also promote soil material transformation, improve soil structure, and improve soil fertility; The combined use of Ping and Ping can cooperatively process polycyclic aromatic hydrocarbons, which greatly improves the processing efficiency.

Description

technical field [0001] The invention belongs to the technical field of phytoremediation of polycyclic aromatic hydrocarbon-contaminated soil, and in particular relates to a method for repairing polycyclic aromatic hydrocarbon-contaminated soil by rushes. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants widely present in environmental media. They are linear, angular or cluster-like neutral or non-polar compounds composed of two or more benzene rings. The chemical structure is stable, it has the effect of "three effects", it is difficult to degrade, and it is easy to accumulate in the living body. [0003] It is generally believed that polycyclic aromatic hydrocarbons are mainly produced by incomplete combustion of hydrocarbons such as petroleum, coal, wood, gas fuel, and paper, and thermal decomposition in a reducing atmosphere. Natural sources of environmental PAHs include: volcanic eruptions, forest vegetation and bush...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 田森林杨点赵群李英杰伏江丽冯睿黄建洪胡学伟
Owner KUNMING UNIV OF SCI & TECH
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