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In-situ remediation method and system for farmland soil contaminated by plasticizer and heavy metal lead

A technology of in-situ remediation of polluted soil, applied in the field of remediation of contaminated farmland soil, can solve the problems of low efficiency, high cost, secondary pollution, etc., and achieve the effect of simple process, low cost and avoiding damage

Inactive Publication Date: 2017-12-15
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the defects of secondary pollution, low efficiency and high cost existing in the remediation technology of the compound polluted farmland soil by plasticizer and heavy metal lead, the present invention proposes a plastic remediation effect, high efficiency, low cost and no secondary pollution. An in-situ remediation method for farmland soil contaminated by chemical agents and heavy metal lead, and a system for realizing the method is provided at the same time

Method used

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  • In-situ remediation method and system for farmland soil contaminated by plasticizer and heavy metal lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to the ratio of 1g glucose, 10g porous foam iron fine particles, 2gEDTA 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, Make a mixed solution; place the above mixed solution in a hydrothermal reaction kettle, heat it at 120°C for 6 hours (the pressure in the hydrothermal reaction kettle is 1.0-2.0MPa), then dissolve EDTA in the above hydrothermal reaction kettle and mix In the solution, heat at 100°C for 1 hour. After the reaction, the porous iron foam fine particles are taken out, washed with deionized water and then dried to obtain EDTA-modified carbon-coated porous iron foam fine particles.

[0037] The EDTA-modified carbon-coated porous foam iron fine particles, sodium peroxide and sodium phytate powder are uniformly mixed in a mass ratio of 80:10:10 to form a mixture.

[0038] Detect the content of plasticizer and lea...

Embodiment 2

[0041] According to the ratio of 2.5g glucose, 5g porous foam iron fine particles, 2.5g EDTA and 40ml water, first dissolve the glucose in water to make a glucose solution, and then put the porous foam iron fine particles with a particle size of 200-500 microns into the glucose solution , made into a mixed solution; the above mixed solution was placed in a hydrothermal reaction kettle, heated at 160°C for 4 hours (the pressure in the hydrothermal reaction kettle was 1.0-2.0MPa), and then EDTA was dissolved in the above-mentioned hydrothermal reaction kettle The mixture is heated at 110° C. for 1.5 hours. After the reaction, the fine porous iron foam particles are taken out, washed with deionized water and then dried to obtain EDTA-modified carbon-coated porous iron foam fine particles.

[0042] The EDTA-modified charcoal-coated porous foam iron fine particles, potassium peroxide and sodium phytate powder are uniformly mixed in a mass ratio of 90:5:5 to form a mixture.

[0043]...

Embodiment 3

[0046] According to the ratio of 2g glucose, 15g porous foam iron fine particles, 3gEDTA and 40ml water, first dissolve the glucose in water to make a glucose solution, and then drop into the glucose solution with a particle size of 200-500 micron porous foam iron fine particles. into a mixed solution; the above mixed solution is placed in a hydrothermal reaction kettle, heated at 180°C for 2 hours (the pressure in the hydrothermal reaction kettle is 1.0-2.0MPa), and then EDTA is dissolved in the mixed solution in the above hydrothermal reaction kettle and then heated at 120°C for 2 hours. After the reaction, the fine porous iron foam particles were taken out, washed with deionized water and then dried to obtain EDTA-modified carbon-coated porous iron foam fine particles.

[0047] The EDTA-modified charcoal-coated porous foam iron fine particles, sodium peroxide and sodium phytate powder are uniformly mixed in a mass ratio of 85:7:8 to form a mixture.

[0048] Detect the plast...

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Abstract

The invention discloses an in-situ remediation method and system for farmland soil contaminated by a plasticizer and heavy metal lead. The method comprises the following steps that (1) fine carbon-coated porous foam iron particles modified by ethylenediamine tetraacetic acid and a mixture of peroxide and sodium phytate are spread into the contaminated soil; and (2) a hydrogen peroxide solution is sprayed into the contaminated soil, the plasticizer, the heavy metal lead and other pollutants in the soil are enriched and removed, and the fine carbon-coated porous foam iron particles modified by the ethylenediamine tetraacetic acid are recycled. The system comprises a material spreading device and a recycling device. The material spreading device comprises a material spreading moving frame which 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 frame which is provided with a magnet recycling device and a foam iron recycling tank. According to the in-situ remediation method and system, the process is simple, the cost is low, the sustainability is high, microorganisms and organic matter in the soil are avoided from being damaged, and secondary pollution risks are avoided.

Description

technical field [0001] The invention relates to a method for repairing farmland soil subjected to compound pollution of plasticizers and heavy metal lead, and belongs to the technical field of contaminated farmland soil restoration. Background technique [0002] Plasticizers are a class of phthalate organic compounds added to plastic products, which have a softening effect and can increase the flexibility of plastics. Due to the large-scale use of plasticizer-containing mulches and plastic waste residues in farmland in modern agricultural production, large-scale pollution of farmland has been caused. According to known literature reports, plasticizers have reproductive toxicity and developmental toxicity, which can cause endocrine disorders in the human body, affect the reproductive system, and increase the risk of cardiovascular diseases. Lead is one of the heavy metals monitored in my country's comprehensive prevention and control plan for heavy metal pollution. It has th...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C2101/00
Inventor 吴娟邹绍艳马东周震峰史衍玺
Owner QINGDAO AGRI UNIV
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