A temperature-sensitive gel-type heavy metal curing agent, a method for curing and repairing heavy metal-contaminated soil, and a method for recovering the curing agent

A technology of polluted soil and temperature-sensitive gel, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc. The recovery method is simple and easy, the curing rate is guaranteed, and the effect of no environmental risk

Active Publication Date: 2021-03-02
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above curing agents all have the defects of poor targeting, inability to be recycled, and poor reusability

Method used

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  • A temperature-sensitive gel-type heavy metal curing agent, a method for curing and repairing heavy metal-contaminated soil, and a method for recovering the curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A temperature-sensitive gel type heavy metal curing agent, the curing agent is a mixed aqueous solution of a synthetic polymer material and a natural polymer material; the concentration of the polymer material in the mixed aqueous solution is 1%, and the described synthetic polymer material is Carbopol 940 and Polyvinyl alcohol, the natural polymer material is sodium alginate, Carbopol 940: polyvinyl alcohol: sodium alginate = 0.5:0.5:9.

[0046] Utilize above-mentioned solidifying agent to carry out the method for solidifying and repairing heavy metal polluted soil, the steps are as follows:

[0047] Spray the above-mentioned liquid curing agent at 20L / mu in the 10-20cm heavy metal-contaminated soil plow layer soil, and cooperate with rotary tillage and irrigation. The curing agent can move with the water. When heavy metals are encountered, the curing agent will interact with the soil. Movable heavy metal ions in the soil react to form complexes, forming a gel with hea...

Embodiment 2

[0054] A temperature-sensitive gel-type heavy metal curing agent, the curing agent is a mixed aqueous solution of a synthetic polymer material and a natural polymer material; the concentration of the polymer material in the mixed aqueous solution is 1.5%, and the synthetic polymer material is polyacrylamide and polyvinyl alcohol, the natural polymer material is konjac mannan, polyacrylamide: polyvinyl alcohol: konjac mannan = 1:0.5:8.5.

[0055] Utilize above-mentioned solidifying agent to carry out the method for solidifying and repairing heavy metal polluted soil, the steps are as follows:

[0056] Spray the above-mentioned liquid curing agent at 35L / mu in the soil of 10-20cm moderately heavy metal-contaminated soil, and cooperate with rotary tillage and irrigation. The curing agent can move with the water. React with the mobile heavy metal ions in the soil to form complexes, and generate a gel with heavy metal ions as the coordination center and polymer materials as the lig...

Embodiment 3

[0063] A temperature-sensitive gel type heavy metal curing agent, the curing agent is a mixed aqueous solution of a synthetic polymer material and a natural polymer material; the concentration of the polymer material in the mixed aqueous solution is 2%, and the described synthetic polymer material is Carbopol 940 and Polyvinyl alcohol, the natural polymer material is sodium carboxymethyl cellulose, Carbopol 940: polyvinyl alcohol: sodium carboxymethyl cellulose = 1:1:8.

[0064] Utilize above-mentioned solidifying agent to carry out the method for solidifying and repairing heavy metal polluted soil, the steps are as follows:

[0065] Spray the above-mentioned liquid curing agent at 35L / mu in the soil of 10-20cm heavy metal-contaminated soil, and cooperate with rotary tillage and irrigation. The curing agent can move with the water. When encountering heavy metals, the curing agent will mix with the soil. Movable heavy metal ions in the soil react to form complexes, forming a ge...

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Abstract

The invention relates to a temperature-sensitive gel type heavy metal curing agent, a heavy metal contaminated soil curing and repairing method and a curing agent recycling method. The temperature-sensitive gel type heavy metal curing agent is a mixed water solution of a synthetic polymer material and a natural polymer material; the concentration of polymer materials in the mixed water solution is0.5 to 2 percent, and a mass ratio of the synthetic polymer material to the natural polymer material is (1 to 4):(6 to 9). Raw materials used by the temperature-sensitive gel type heavy metal curingagent disclosed by the invention are low in cost, are safe and efficient and are strong in targeting ability; a using method is simple and easy; secondary pollution to soil cannot be caused after thetemperature-sensitive gel type heavy metal curing agent is put into use for a long term, and the temperature-sensitive gel type heavy metal curing agent can be repeatedly recycled and utilized; a recycling method is simple and easy and has a wide application prospect in heavy metal contaminated soil repairing.

Description

technical field [0001] The invention relates to a temperature-sensitive gel-type heavy metal curing agent, a method for curing and repairing heavy metal-contaminated soil, and a method for recovering the curing agent, and belongs to the technical field of environmental protection. Background technique [0002] In recent years, with the rapid development of industry and agriculture, various pollutants have continuously entered the soil through the abuse of chemical fertilizers and pesticides, and the wanton discharge of waste from industrial and mining enterprises, which has caused the deterioration of the ecological environment and seriously threatened the sustainable development of agriculture. and even human health. Among them, heavy metal ion pollution represented by copper, zinc, and cadmium ions has caused serious damage to the soil. The U.S. EPA Priority Control List pointed out that among the 1200 contaminated soils, 37% of the sites were polluted by heavy metals. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/32C09K17/18C09K17/22B09C1/08
Inventor 沈玉文林海涛范文静马征刘苹宋效宗王江涛
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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