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A method for repairing heavy metal cadmium farmland soil by using stabilized repair material

A technology of remediation materials and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of discount of treatment effect, poor consideration, and increase of ecological risks, so as to reduce immersion, enhance fixation ability, and improve the ability of stabilized restoration. Effect

Active Publication Date: 2022-05-13
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Biochar is a low-cost and widely used soil conditioner. In the prior art, biochar is usually used as the core to design an ideal stabilized repair material; most of the stabilized repair materials in the current research are suitable for the temperature difference in winter in the north. The large actual situation is not well considered, so the restoration materials that perform well in the experiment will often have a greatly reduced treatment effect in the soil with a large temperature difference in the north. The reason is that the soil will repeatedly thaw in winter, and the soil temperature difference is large. In the process of repeated soil thawing, different forms of cadmium will change greatly; therefore, in the process of biochar stabilization and restoration, repeated soil thawing will promote the transformation of cadmium to the effective state and increase the ecological risk

Method used

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  • A method for repairing heavy metal cadmium farmland soil by using stabilized repair material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for repairing heavy metal cadmium farmland soil using stabilized repair materials, comprising the following steps:

[0028] S1: Soil Treatment

[0029] Preliminary screening of the soil to be repaired, separating impurities with a particle size greater than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, the soil particle size is 2mm;

[0030] S2: Preparation of the first restoration material

[0031] Mix and stir biochar, calcium carbonate, and alkali sulfide in a mass ratio of 3:2:2, heat at 85°C for 3 hours, and keep stirring to obtain a mixture; then mix the obtained mixture with iron oxide in a mass ratio of 2:1 , after 20 minutes of magnetized grinding, heating in a water bath at 80°C for 60 minutes, and continuous stirring, to obtain the first repair material;

[0032] Wherein the particle diameter of biochar is 0.5mm, the particle diameter of calcium carbonate is 120nm, the particle diameter of alkali sulfide is 50nm, and t...

Embodiment 2

[0043] A method for repairing heavy metal cadmium farmland soil using stabilized repair materials, comprising the following steps:

[0044] S1: Soil Treatment

[0045] Preliminary screening of the soil to be repaired, separating impurities with a particle size greater than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, with a particle size of 1.8mm; and then sampling and analyzing the heavy metal content of the soil;

[0046] S2: Preparation of the first restoration material

[0047] Mix and stir biochar, calcium carbonate, and alkali sulfide in a mass ratio of 5:3:2, heat at 96°C for 4 hours, and keep stirring to obtain a mixture; then mix the obtained mixture with iron oxide in a mass ratio of 3:1 , after 25 minutes of magnetized grinding, heating in a water bath at 85°C for 90 minutes, and continuous stirring, to obtain the first repair material;

[0048] Wherein the particle size of biochar is 0.8mm, the particle size of calcium carbonate is 16...

Embodiment 3

[0059] A method for repairing heavy metal cadmium farmland soil using stabilized repair materials, comprising the following steps:

[0060] S1: Soil Treatment

[0061] Preliminary screening of the soil to be repaired, separating impurities with a particle size greater than 35mm in the soil to be repaired; crushing the obtained soil to be repaired, with a particle size of 1.8mm; and then sampling and analyzing the heavy metal content of the soil;

[0062] S2: Preparation of the first restoration material

[0063] Mix and stir biochar, calcium carbonate, and alkali sulfide in a mass ratio of 7:5:3, heat at 125°C for 8 hours, and keep stirring to obtain a mixture; then mix the obtained mixture with iron oxide in a mass ratio of 4:1 , after 30 minutes of magnetized grinding, heating in a water bath at 95°C for 120 minutes, and continuous stirring, to obtain the first repair material;

[0064] Wherein the particle diameter of biochar is 1.2mm, the particle diameter of calcium car...

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Abstract

The invention relates to the technical field of heavy metal soil remediation, and discloses a method for remediating heavy metal cadmium farmland soil with stabilized remediation materials; it includes the following steps: firstly, the remediation soil is initially screened and crushed; biochar, calcium carbonate, sulfide The alkali is mixed and stirred, and heated to obtain the mixture; then the mixture is mixed with iron oxide, and after being magnetized and ground, heated in a water bath to obtain the first repair material; calcium oxide, potassium dihydrogen phosphate, and adhesive are mixed, heated and stirred to obtain the second repair material Material; first send the soil obtained by the crushing treatment into the mixer, add regulating water to control the water content of the soil, then add the first repair material and the second repair material for repair treatment; the present invention can improve the continuous stability of biochar in soils with large temperature differences The ability of chemical repair promotes the effective fixation of heavy metal cadmium and reduces the bioavailability of heavy metal cadmium.

Description

technical field [0001] The invention relates to the technical field of heavy metal soil repair, in particular to a method for repairing heavy metal cadmium farmland soil by using a stabilized repair material. Background technique [0002] With the continuous development of industry, the pollution of heavy metals in soil is becoming more and more serious; in the total exceeding rate of soil in the country, the exceeding rate of metal cadmium and lead is more prominent, and it has become the key object of soil treatment. Because cadmium has high activity and strong mobility, it is easy to accumulate in plants through plant roots, which has a serious impact on areas where the main pillar industry is agriculture. [0003] Biochar is a low-cost and widely used soil conditioner. In the prior art, biochar is usually used as the core to design an ideal stabilized repair material; most of the stabilized repair materials in the current research are suitable for the temperature differe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
CPCB09C1/00
Inventor 李群周艳范婷婷万金忠张孝飞王祥赵远超
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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