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In-situ repair method and system for heavy meal cadmium and polycyclic aromatic hydrocarbon polluted farmland soil

A polycyclic aromatic hydrocarbon and polluted soil technology, applied in the field of soil remediation of polluted farmland, can solve the problems of high cost, low efficiency, secondary pollution, etc., and achieve the effects of low cost, simple process, and no secondary pollution.

Inactive Publication Date: 2017-12-01
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defects of secondary pollution, low efficiency and high cost existing in the remediation technology of heavy metal cadmium and polycyclic aromatic hydrocarbon compound polluted farmland soil, the present invention proposes a heavy metal remediation effect, high efficiency, low cost and no secondary pollution An in-situ remediation method for cadmium and polycyclic aromatic hydrocarbons polluted farmland soil, and a system for realizing the method is provided at the same time

Method used

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  • In-situ repair method and system for heavy meal cadmium and polycyclic aromatic hydrocarbon polluted farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the ratio of 1g glucose, 10g porous foam iron fine particles and 40ml water, first dissolve glucose in water to make glucose solution, then drop into the glucose solution with porous foam iron fine particles with a particle size of 200-500 microns to prepare Mixed solution; put the above mixed solution in a hydrothermal reaction kettle, heat at 120°C for 6 hours (the pressure in the hydrothermal reaction kettle is 1.0-2.0MPa), after the reaction, take out the porous foam iron fine particles and wash them with deionized water After drying, the fine particles of carbon-coated porous foam iron are obtained.

[0035] The charcoal-coated porous foam iron fine particles, sodium peroxide and sodium phytate powder are uniformly mixed in a mass ratio of 65:15:20 to form a mixture.

[0036] Detect the content of cadmium and polycyclic aromatic hydrocarbons in the polluted soil. When the cadmium content in the polluted soil is less than or equal to 3.0mg / kg, sprinkle ...

Embodiment 2

[0039] According to the ratio of 2.5g glucose, 5g porous foam iron fine particles and 40ml water, glucose is dissolved in water earlier to make glucose solution, then drop into the glucose solution with a particle size of 200-500 micron porous foam iron fine particles to prepare Mixed solution: put the above mixed solution in a hydrothermal reaction kettle, heat at 160°C for 4 hours (the pressure in the hydrothermal reaction kettle is 1.0-2.0MPa), after the reaction, take out the porous foam iron fine particles and wash them with deionized water After drying, the fine particles of carbon-coated porous foam iron are obtained.

[0040] The charcoal-coated porous foam iron fine particles, potassium peroxide and sodium phytate powder are uniformly mixed in a mass ratio of 85:5:10 to form a mixture.

[0041] Detect the content of cadmium and polycyclic aromatic hydrocarbons in the polluted soil. When the cadmium content in the polluted soil is less than or equal to 3.0mg / kg, sprink...

Embodiment 3

[0044] According to the ratio of 2g glucose, 15g porous foam iron fine particles and 40ml water, first dissolve glucose in water to make glucose solution, then drop into the glucose solution with a particle size of 200-500 micron porous foam iron fine particles to form a mixture liquid; put the above mixed solution in a hydrothermal reaction kettle, heat it at 180°C for 2 hours (the pressure in the hydrothermal reaction kettle is 1.0-2.0MPa), after the reaction, take out the porous foam iron fine particles, wash them with deionized water After drying, the fine particles of carbon-coated porous foam iron can be obtained.

[0045] The charcoal-coated porous foam iron fine particles, sodium peroxide and sodium phytate powder are uniformly mixed in a mass ratio of 75:10:15 to form a mixture.

[0046] Detect the content of cadmium and polycyclic aromatic hydrocarbons in the polluted soil. When the cadmium content in the polluted soil is less than or equal to 3.0mg / kg, sprinkle 50g ...

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Abstract

The invention discloses an in-situ repair method and system for heavy meal cadmium and polycyclic aromatic hydrocarbon polluted farmland soil. The method comprises the following steps: (1) spreading a mixture of carbon coated porous foamed iron subparticles, a peroxide and sodium phytate into polluted soil; (2) spraying a hydrogen peroxide solution into the polluted soil, concentrating and removing pollutants such as polycyclic aromatic hydrocarbon and heavy meal cadmium in the soil; and then recycling carbon coated porous foamed iron subparticles. The system comprises a material spreading device and a recycling device, the material spreading device comprises a material spreading moving rack, and the material spreading moving rack is provided with a mixture hopper, a hydrogen peroxide solution storage tank and a hydrogen peroxide solution spray head; the recycling device comprises a recycling moving rack, and the recycling moving rack is provided with a magnet recycling device and a foamed iron recycling tank. The method is simple in process, low in cost and high in continuity, the damage on soil microorganisms and organic matters is avoided, and the risk of secondary pollution does not exist.

Description

technical field [0001] The invention relates to a method for repairing farmland soil subjected to compound pollution of heavy metal cadmium and polycyclic aromatic hydrocarbons, and belongs to the technical field of contaminated farmland soil restoration. Background technique [0002] Cadmium is one of the heavy metals monitored in the comprehensive prevention and control plan of heavy metal pollution in my country. It has the characteristics of strong biological migration, easy absorption and accumulation by plants, and can cause toxic effects on animals, plants and human body. According to statistics, the area of ​​farmland polluted by cadmium in my country has exceeded 280,000 hectares, and about 10% of common commercial rice in my country has excessive cadmium. This phenomenon of exceeding the standard has caused great hidden dangers to the environment and human health. Polycyclic aromatic hydrocarbons are carcinogenic, teratogenic, and mutagenic, and are highly hydroph...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 马东吴娟柴超邬欣慧马天津郑永权
Owner QINGDAO AGRI UNIV
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