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Polyaromatic hydrocarbon polluted soil phytoremediation simulation test system and simulation test method

A technology for polluted soil and polycyclic aromatic hydrocarbons, which is applied in the field of polluted soil treatment, can solve the problems of insufficient test scale, insufficient pollution medium system, and inability to reproduce the results completely, and achieves high promotion and use value, flexible design, and easy maintenance and management. Effect

Active Publication Date: 2015-04-01
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used simulation methods are mainly pot experiments or artificial wetland (floating bed) experiments, but these methods have shortcomings in terms of test scale, polluted medium, and system integrity, and the results obtained cannot be completely reproduced in actual polluted sites.

Method used

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  • Polyaromatic hydrocarbon polluted soil phytoremediation simulation test system and simulation test method
  • Polyaromatic hydrocarbon polluted soil phytoremediation simulation test system and simulation test method
  • Polyaromatic hydrocarbon polluted soil phytoremediation simulation test system and simulation test method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0038] This example examines the strengthening effect of surfactants. Celery was selected as the restoration plant. The contaminated soil was collected from a decommissioned coking plant, and the total concentration of polycyclic aromatic hydrocarbons was 120mg / kg.

[0039] In the test method: the C:N:P mass ratio of the inorganic nutrient solution is 100:10:1, and the organic carbon source is a glucose solution containing 150 mg of carbon per liter; the contaminated soil is paved and compacted every 5 cm in height, and the contaminated soil layer The total thickness is 40cm; fill a layer of 5cm thick clean soil on the polluted soil layer; add a total of 5 well pipes, the longitudinal distance is 40cm, and the bottom of the pipe is 10cm away from the bottom of the treatment tank; the bottom of the nozzle is 30cm away from the bottom of the treatment tank; the water supply branch pipe has 5 roots; the absolute water content of the soil was kept at about 20%; the system was runn...

Embodiment 2

[0042] This example examines the strengthening effect of micro-nano bubbles. Ryegrass was selected as the restoration plant. The contaminated soil was collected from a decommissioned shipyard, and the total concentration of polycyclic aromatic hydrocarbons was 82mg / kg.

[0043] In the test method: the C:N:P mass ratio of the inorganic nutrient solution is 200:2:1, and the organic carbon source is a glucose solution containing 15 mg of carbon per liter; the contaminated soil is paved and compacted at a height of 6 cm, and the contaminated soil layer The total thickness is 30cm; fill a layer of 10cm thick clean soil on the polluted soil layer; add a total of 2 well pipes, the longitudinal distance is 60cm, the bottom of the pipe is 2cm from the bottom of the treatment tank; the bottom of the nozzle is 20cm from the bottom of the treatment tank; the water supply branch pipe has 2 roots; the absolute water content of the soil was kept at about 10%; the system was operated for 1 we...

Embodiment 3

[0046] This example examines the strengthening effect of mixed planting of plants. Two-week-old ryegrass, clover, celery, and corn were selected as restoration plants. The contaminated soil was collected from a gas station, and the total concentration of polycyclic aromatic hydrocarbons was 112 mg / kg.

[0047] In the test method: the C:N:P mass ratio of the inorganic nutrient solution is 150:5:1, and the organic carbon source is a sodium lactate solution containing 300 mg of carbon per liter; the contaminated soil is paved and compacted every 3 cm in height, and the contaminated soil layer The total thickness is 60cm; fill a layer of 2cm thick clean soil on the polluted soil layer; add a total of 8 well pipes, the longitudinal distance is 20cm, the bottom of the pipe is 20cm from the bottom of the treatment tank; the bottom of the nozzle is 40cm from the bottom of the treatment tank; the water supply branch pipe has 8 roots; the absolute water content of the soil was kept at a...

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Abstract

The invention discloses a polyaromatic hydrocarbon polluted soil phytoremediation simulation test system and a simulation test method. The system comprises a water supply device, a spraying system, a plant treatment tank, a liquid buffering tank and a liquid recycling bottle which are connected in sequence, wherein the spraying system consists of a plurality of sprayers and a water supply pipe network connected with the sprayers; the sprayers are positioned in the plant treatment tank; the plant treatment tank is communicated with the liquid buffering tank through a porous water distribution partition plate; high-efficiency remediation plants are planted in the plant treatment tank, and a plurality of medicament feeding wells and a plurality of soil gas monitoring wells are mounted in the plant treatment tank; soil sampling holes are formed in the side wall of the plant treatment tank. The method comprises the processes of preparation of nutrient liquid, filling of polluted soil mediums, stabilization of the system, planting of the remediation plants and simulation of various measures to strengthen phytoremediation. The system and the method are flexible in design, easy to operate, high in controllability and low in cost, avoid secondary pollution, are favorable for development of strengthening measures for phytoremediation of the polyaromatic hydrocarbon polluted soil and discuss of an action mechanism and have high popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil treatment, and in particular relates to a simulation test system and a simulation test method for phytoremediation of polycyclic aromatic hydrocarbon contaminated soil. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants ubiquitous in soil. They mainly come from the incomplete combustion or pyrolysis of fossil fuels such as coal and petroleum. They are highly toxic and can cause carcinogenic, teratogenic, and mutagenic effects. , will cause serious harm to the ecosystem and human health. In my country, the pollution of polycyclic aromatic hydrocarbons in soil has been quite serious, the concentration of polycyclic aromatic hydrocarbons has risen from μg / kg to mg / kg, the detection rate has increased from 20% to 80%, and the detection rate in agricultural products has also reached 20%. %. At the same time, soil polycyclic arom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 孟梁郭琳李炳智高洁杨洁朱江朱杰喻恺
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES