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Soil heavy metal stabilizer

A heavy metal stabilizer and soil technology, which is applied in the direction of soil conditioning materials, restoration of polluted soil, organic fertilizers, etc., can solve the problems of difficult adsorption of heavy metals, strong hydrophobicity, etc., achieve carbon sequestration, short repair time, and good effect Effect

Active Publication Date: 2015-05-06
银发环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the surface of biochar has obvious porous characteristics, large specific surface area and high surface energy, it is difficult to adsorb heavy metals on most surfaces due to the lack of polar functional groups on the surface of biochar and strong hydrophobicity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Preparation of activated biochar: take the corncob and place it in an oven at 60°C and dry it, crush it to 200 mesh, immerse it in a 0.5mol / L NaOH solution for 18 hours, and then place it in an airflow velocity of 150cm 3 / min of N 2 Under protection, fired at 500°C for 4 hours, cooled to room temperature, washed with distilled water, and dried to obtain activated biochar;

[0029] b. Preparation of soil metal stabilizer: Take a solution of sodium dithiocarbamate derivative with a concentration of 10mmol / L and activated biochar at a weight ratio of 1:100 and mix it at a speed of 60r / min under dark conditions. Equilibrate and shake for 6 days, then centrifuge at 2000r / min for 15min, remove the supernatant, collect the precipitation mixture, and dry to obtain the soil metal stabilizer.

[0030] In order to verify the technical effect of the present invention, the contaminated soil around a certain smelter was taken as a sample and crushed and screened. The following tests a...

Embodiment 2

[0036] a. Preparation of activated biochar: take the straw and place it in an oven at 50℃ and dry it, crush it to 200 mesh, immerse it in a KOH solution with a concentration of 0.1mol / L for 24 hours, and then place it in an airflow velocity of 150cm 3 / min of N 2 Under protection, fired at 200°C for 4 hours, cooled to room temperature, washed with distilled water, and dried to obtain activated biochar;

[0037] b. Preparation of soil metal stabilizer: mix 1mmol / L sodium pyrrolidine dithiocarbamate solution with activated biochar at a weight ratio of 1:120, and run at a speed of 60r / min under dark conditions. Equilibrate and oscillate for 5 days, then centrifuge at 2000r / min for 15 minutes, remove the supernatant, collect the precipitation mixture, and dry to obtain the soil metal stabilizer.

[0038] In order to verify the technical effect of the present invention, the contaminated soil around a certain smelter was taken as a sample and crushed and screened. The following tests are...

Embodiment 3

[0044] a. Preparation of activated biochar: take rice husk and banana stalks at a weight ratio of 2:1 and mix them, place them in an oven at 40°C and dry them, crush them to 200 meshes, and use a concentration of 1mol / L Mg( OH) 2 The solution is immersed for 3 hours, and then the air velocity is 150cm 3 / min of N 2 Under protection, fired at 700°C for 4 hours, cooled to room temperature, washed with distilled water, and dried to obtain activated biochar;

[0045] b. Preparation of soil metal stabilizer: mix 20mmol / L sodium bibenzyldithiocarbamate solution with activated biochar at a weight ratio of 1:80, and rotate at 60r / min under dark conditions. Perform equilibrium shaking for 7 days, and then centrifuge at 2000 r / min for 15 minutes, remove the supernatant, collect the precipitation mixture, and dry to obtain the soil metal stabilizer.

[0046] In order to verify the technical effect of the present invention, the contaminated soil around a certain smelter was taken as a sample a...

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Abstract

The invention relates to a soil heavy metal stabilizer and belongs to the technical field of soil remediation treatment. The soil heavy metal stabilizer is mainly prepared from the following components in parts by weight: activated biochar and a sodium dithiocarbamate derivative solution. The soil heavy metal stabilizer has the advantages that a remarkable adsorption and fixation effect on heavy metals in the soil is achieved, plants or crops can be effectively prevented from absorbing the heavy metals in the soil and the risk that human takes in heavy metals from the crops is reduced.

Description

Technical field [0001] The invention belongs to the technical field of soil remediation and treatment, and specifically relates to a soil heavy metal stabilizer. Background technique [0002] In recent years, heavy metal pollution incidents have occurred frequently, and the problem of heavy metal soil pollution has become increasingly serious. According to the “2014 National Survey Communiqué on Soil Pollution Status” published by the Ministry of Environmental Protection and the Ministry of Land and Resources, the country’s total soil pollution rate exceeded 16.1%, and the rate of cultivated soil points exceeded 19.4%. The area of ​​soil pollution is increasing year by year and has not been effectively controlled. Heavy metal soil pollution has become one of the most important environmental problems in my country, and the situation is particularly severe. [0003] For the remediation and treatment of heavy metal soil, stabilization technology is a relatively mature and economical...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 吴文卫吴迪周丹丹魏东王加发曾蓉
Owner 银发环保股份有限公司
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