Method for combined enhanced phytoremediation of polycyclic aromatic hydrocarbon polluted farmland soil

A polycyclic aromatic hydrocarbon and phytoremediation technology, applied in the field of soil organic pollution remediation, can solve problems such as low bioavailability and limited phytoremediation efficiency, and achieve the effects of weak enrichment ability, improved phytoremediation efficiency, and improved biological activity.

Inactive Publication Date: 2021-06-04
SHENYANG UNIV
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Problems solved by technology

[0004] For this reason, the present invention provides a method for combined strengthening of phytoremediation of PAH-contaminated farmland soil to solve the problem of existing phytoremediation of PAH-contaminated farmland soil technology. Due to the strong hydrophobicity of PAH compounds, they are easily adsorbed Low bioavailability in soil particles, resulting in limited phytoremediation efficiency

Method used

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  • Method for combined enhanced phytoremediation of polycyclic aromatic hydrocarbon polluted farmland soil
  • Method for combined enhanced phytoremediation of polycyclic aromatic hydrocarbon polluted farmland soil

Examples

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Embodiment 1

[0028] A method for uniting and strengthening phytoremediation of polycyclic aromatic hydrocarbon-contaminated farmland soil. This embodiment is carried out in a greenhouse for facility agriculture in Shenbei New District, Shenyang City, and includes the following steps:

[0029] S1: Level the 0-20cm surface soil of facility agriculture, discard the residues including weeds, gravel, and plastic, and continue to plow and mix; adopt the field experiment method, the area of ​​the experimental plot is 1.5m×1.5m, and the area of ​​the adjacent plot is 1.5m×1.5m. Set up about 50cm isolation ditch between them.

[0030] S2: Spray the prepared anion-nonionic mixed surfactant RL-TX100 solution containing rhamnolipid (RL) and Triton 100 (TX100) evenly on the polluted soil, wherein, rats in the RL-TX100 solution The mixing ratio of Liglycolipid (RL) and Triton 100 (TX100) is 1:9, the spraying concentration is 80mg / kg soil, and then the soil is turned and mixed immediately.

[0031] S3: ...

Embodiment 2

[0035] Compared with Example 1, the experiment of this example is that the concentration of the RL-TX100 solution is 100 mg / kg of soil sprayed on the soil, and other steps are the same as Example 1.

[0036] The radish was harvested when it was 3 months old, and the content of polycyclic aromatic hydrocarbons in the soil was measured, and the degradation rate was calculated, such as figure 1 As shown, under the experimental conditions, the content of polycyclic aromatic hydrocarbons in the soil is 404.47μg / kg, such as figure 2 As shown, the degradation rate of PAHs under the experimental conditions was 36.26%.

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Abstract

The invention discloses a method for combined enhanced phytoremediation of polycyclic aromatic hydrocarbon polluted farmland soil, and relates to the technical field of soil organic pollution remediation technologies, the method comprises the following steps: spraying an anionic-nonionic mixed surfactant in the polycyclic aromatic hydrocarbon polluted farmland soil, applying plant ash, and planting a low-accumulation crop radish at the same time. According to the method, adsorption-state polycyclic aromatic hydrocarbon in soil is promoted to be released into a soil solution by using the anionic-nonionic mixed surfactant, the biological activity of the soil is improved, the phytoremediation efficiency is further improved, plant ash is used as a fertilizer, the activity and the number of indigenous microorganisms are improved, biodegradation of the polycyclic aromatic hydrocarbon in the soil is promoted, the method has the advantages of no damage to the field structure, large-area application, low investment, simple operation, environmental protection, safety, effectiveness and environment beautification, and has important significance on continuous and efficient utilization of land cultivated land resources.

Description

technical field [0001] The invention relates to the technical field of soil organic pollution remediation technology, in particular to a method for remediating polycyclic aromatic hydrocarbon-contaminated farmland soil by combining and strengthening plants. Background technique [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) refer to condensed ring compounds containing two or more benzene rings arranged in linear, angular or clustered shapes, which are widely present in the environment and are prioritized by the U.S. Environmental Protection Agency. A class of persistent organic pollutants. With the continuous increase in the consumption of fossil energy such as coal and petroleum, and the incineration of a large amount of biomass such as farmland straw, the content of polycyclic aromatic hydrocarbons discharged into the environment has increased year by year. More than 90% of PAHs emitted into the atmosphere will enter the soil through at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10B09C1/105B09C2101/00
Inventor 王晓旭罗庆魏忠平焦振恒赵莹莹邓金梁吴昊王辉
Owner SHENYANG UNIV
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