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Restoration method of glyphosate-heavy metal compound contaminated farmland soil

A technology of compound pollution and repair method, applied in the restoration of polluted soil, etc., can solve the problems of poor permeability repair effect, high dependence, long treatment cycle, etc., and achieve accelerated oxidation degradation efficiency, good adsorption performance, and high specific surface area Effect

Active Publication Date: 2019-03-08
THE FRONTIER TECH RES INST OF TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN101293254A discloses a method for rinsing and repairing heavy metal-organic compound polluted soil. A leaching agent is prepared to treat soil compound polluted by polycyclic aromatic hydrocarbons and heavy metals. This method is suitable for soil with heavy geological viscosity and relatively poor permeability The repair effect is poor, and the elution waste liquid may also cause secondary pollution of the soil
CN103191913A discloses a photochemical remediation method for compound-contaminated soil with organic matter and heavy metals. This method needs to continuously turn the soil. In addition, the light source used is sunlight or ultraviolet light. The specific usage depends on whether the sunlight is sufficient. The process is cumbersome
CN106694535A discloses a remediation technology and process for heavy metal and organic compound polluted soil. The pollutants in the soil are treated by means of physical and chemical leaching, microbial degradation and phytoremediation. This method is highly dependent on the surrounding environment and has a long treatment cycle

Method used

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  • Restoration method of glyphosate-heavy metal compound contaminated farmland soil
  • Restoration method of glyphosate-heavy metal compound contaminated farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh soil samples from glyphosate-Pb compound polluted farmland soil, dry at 105°C, grind and pass through a 120-mesh sieve;

[0033] 2) Weigh hydroxypropyl-β-cyclodextrin (HPCD) and add it to 0.02mol / L FeSO4 aqueous solution, the solid-liquid ratio of HPCD and FeSO4 solution is 0.1:1 (kg:L). Then add sodium persulfate, add sodium persulfate and FeSO4 The molar ratio is 1:1. Stir the mixture of HPCD, FeSO4 and sodium persulfate at a speed of 150r / min for 8min to obtain an oxidizing agent solution;

[0034] 3) Add the soil sample to the oxidant solution, the solid-to-liquid ratio of the soil sample to the oxidant solution is 1:5 (kg:L), after mixing for 180 minutes, then add organoclay and mix evenly, the mass of organoclay added is 2% of the sample mass, and the treatment time is 200min, to realize the remediation of glyphosate-heavy metal compound polluted farmland soil.

[0035] The organoclay of implementation can adopt following method to prepare: method compr...

Embodiment 2

[0041] 1) Weigh soil samples from glyphosate-Zn composite polluted farmland soil, dry at 108°C, and pass through a 160-mesh sieve after grinding;

[0042] 2) Weigh hydroxypropyl-β-cyclodextrin (HPCD) and add it to 0.03mol / L FeSO4 aqueous solution, the solid-liquid ratio of HPCD and FeSO4 solution is 0.2:1 (kg:L). Then add sodium persulfate, add sodium persulfate and FeSO The molar ratio is 2:1. Stir the mixture of HPCD, FeSO4 and sodium persulfate at a speed of 175r / min for 10min to obtain an oxidizing agent solution;

[0043] 3) Add the soil sample to the oxidant solution, the solid-to-liquid ratio of the soil sample to the oxidant solution is 1:6 (kg:L), after mixing for 190 minutes, then add organoclay and mix evenly, the mass of organoclay added is equal to that of the added soil 4% of the sample mass, the treatment time is 210min, and the remediation of glyphosate-heavy metal compound polluted farmland soil is realized.

[0044] The organoclay of implementation can adop...

Embodiment 3

[0050] 1) Weigh soil samples from glyphosate-Cr composite polluted farmland soil, dry at 110°C, and pass through a 200-mesh sieve after grinding;

[0051] 2) Weigh hydroxypropyl-β-cyclodextrin (HPCD) and add it to 0.04mol / L FeSO4 aqueous solution. The solid-liquid ratio of HPCD and FeSO4 solution is 0.3:1 (kg:L). Then add sodium persulfate, add sodium persulfate and FeSO The molar ratio is 3:1. Stir the mixture of HPCD, FeSO4 and sodium persulfate at a speed of 200r / min for 15min to obtain an oxidizing agent solution;

[0052] 3) Add the soil sample to the oxidant solution, the solid-to-liquid ratio of the soil sample to the oxidant solution is 1:8 (kg:L), after mixing for 240 minutes, then add organoclay and mix evenly, the mass of the added organoclay is equal to the added soil 6% of the sample mass, and the treatment time is 240 minutes, to realize the remediation of glyphosate-heavy metal complex polluted farmland soil.

[0053] The organoclay of implementation can adopt...

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Abstract

The invention relates to a restoration method of glyphosate-heavy metal compound contaminated farmland soil. Soil samples are weighed from the glyphosate-heavy metal compound contaminated farmland soil and are dried and ground; hydroxypropyl-beta-cyclodextrin is weighed to be added into a FeSO4 aqueous solution; then sodium persulfate is added, stirring is carried out, and an oxidizing agent solution is obtained; the soil samples are added into the oxidizing agent solution, and after mixing treatment, organic clay is added for uniform mixing treatment; and the glyphosate-heavy metal compound contaminated farmland soil is restored. By means of the restoration method, in the compound contaminated soil, the lead content exceeds 200 mg / kg, the zinc content exceeds 400 mg / kg, the chromium content exceeds 500 mg / kg, and the glyphosate content exceeds 50 mg / kg; and in the soil obtained after treatment, the total lead concentration is lower than 20 mg / kg, the total zinc concentration is lowerthan 35 mg / kg, the total chromium concentration is lower than 30 mg / kg, and the glyphosate content is lower than 0.1 mg / kg

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and in particular relates to a method for remediating glyphosate-heavy metal compound polluted farmland soil. Background technique [0002] Soil is a precious resource in nature and a necessary condition for human survival. The soil environment is the foundation of human survival and development. Soil heavy metal pollution refers to the phenomenon that heavy metals enter the soil through human activities, making the heavy metal content in the soil significantly higher than its natural background value, and causing the deterioration of the ecological environment quality. At present, with the development of society and economy, the widespread use of industrial pollutants, chemicals, pesticides and chemical fertilizers has caused heavy metal pollutants to enter the agricultural environment through various channels, resulting in increasingly serious heavy metal pollution in farmland soil,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 丁辉梁奔强薛花
Owner THE FRONTIER TECH RES INST OF TIANJIN UNIV
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