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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  • 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 heav

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

Example Embodiment

[0033] Example 1

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

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

[0036] Detect the cadmium content and polycyclic aromatic hydrocarbon content in the contaminated soil. When the cadmium content in the contaminated soil is less than 3.0mg / kg, 100g per sq...

Example Embodiment

[0038] Example 2

[0039] According to the ratio of 2.5g glucose, 5g porous iron foam fine particles to 40ml water, first dissolve glucose in water to make a glucose solution, and then put into the glucose solution the 200-500 micron porous iron foam fine particles to form Mixed solution: Place the above mixed solution in a hydrothermal reactor and heat it at 160°C for 4 hours (the pressure in the hydrothermal reactor is 1.0~2.0MPa). After the reaction, the porous iron foam particles are taken out and washed with deionized water After drying, fine particles of carbon-coated porous iron foam are obtained.

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

[0041] Detect the content of cadmium and polycyclic aromatic hydrocarbons in the contaminated soil. When the cadmium content in the contaminated soil is less than 3.0mg / kg, 150g per square meter of the contaminat...

Example Embodiment

[0043] Example 3

[0044] According to the ratio of 2g glucose, 15g porous iron foam fine particles to 40ml water, first dissolve glucose in water to make a glucose solution, and then put into the glucose solution 200-500 micron porous iron foam fine particles and mix them Liquid; Put the above mixed liquid in a hydrothermal reactor and heat it at 180℃ for 2 hours (the pressure in the hydrothermal reactor is 1.0~2.0MPa). After the reaction, the porous iron foam particles are taken out and washed with deionized water After drying, fine particles of carbon-coated porous iron foam are obtained.

[0045] The carbon-coated porous iron foam 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 cadmium content and polycyclic aromatic hydrocarbon content in the contaminated soil, when the cadmium content in the contaminated soil is less than 3.0mg / kg, 50g per square meter of the contaminated soil will...

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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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