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

AI Technical Summary

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 re

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

Example Embodiment

[0035] Example 1

[0036] According to the ratio of 1g glucose, 10g porous iron foam particles, 2g EDTA and 40ml water, first dissolve glucose in water to make a glucose solution, and then put into the glucose solution the porous iron foam particles with a particle size of 200-500 microns. Prepare a mixed solution; place the above mixed solution in a hydrothermal reactor, heat it at 120°C for 6 hours (the pressure in the hydrothermal reactor is 1.0~2.0MPa), and then dissolve EDTA in the above hydrothermal reactor. In the liquid, it is heated at 100°C for 1 hour. After the reaction, the porous iron foam fine particles are taken out, washed with deionized water and dried to obtain EDTA modified carbon-coated porous iron foam fine particles.

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

[0038] Detect the plasticizer content and lead content in the c...

Example Embodiment

[0040] Example 2

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

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

[0043] Detect the plasticizer con...

Example Embodiment

[0045] Example 3

[0046] According to the ratio of 2g glucose, 15g porous iron foam particles, 3g EDTA and 40ml water, first dissolve glucose in water to make a glucose solution, and then put into the glucose solution the porous iron foam particles with a particle size of 200-500 microns. Into a mixed liquid; put the above mixed liquid in a hydrothermal reactor, heat at 180℃ for 2 hours (the pressure in the hydrothermal reactor is 1.0~2.0MPa), and then dissolve EDTA in the mixed liquid in the above hydrothermal reactor The inside is heated at 120°C for 2 hours. After the reaction, the porous iron foam fine particles are taken out, washed with deionized water and dried to obtain EDTA modified carbon-coated porous iron foam fine particles.

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

[0048] Detect the plasticizer content and lead content in the con...

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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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