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Remediation agent for heavy metal cadmium contaminated soil, preparation method and application method

A technology for cadmium-contaminated soil and an application method, which is applied in the field of remediation agents for heavy metal cadmium-contaminated soils, can solve problems such as poor long-term remediation effect, long remediation period of the remediation agent, and is not suitable for large-area use, and achieves low price and environmental quality. The effect of increasing and decreasing the biologically effective amount of cadmium

Inactive Publication Date: 2019-03-12
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sprinkling soil remediation materials into cultivated soil is an effective method to remediate heavy metal cadmium-contaminated soil. However, among the currently disclosed heavy metal soil remediation technologies, some remediation materials themselves are harmful to the environment and will cause secondary pollution to the soil. Some have high cost and are not suitable for large-area use; some repair agents have a long repair period, and the long-term repair effect is not good

Method used

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  • Remediation agent for heavy metal cadmium contaminated soil, preparation method and application method
  • Remediation agent for heavy metal cadmium contaminated soil, preparation method and application method
  • Remediation agent for heavy metal cadmium contaminated soil, preparation method and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A remediation agent for heavy metal cadmium polluted soil is prepared from the following raw materials in parts by weight:

[0027]

[0028]

[0029] Among them, the source of limestone is natural, CaCO 3 Content greater than 98wt%, Fe 2 o 3 The content is less than 0.01% by weight; the preparation process of biochar is as follows: put rice husks, the raw material of biochar, into a pyrolysis reactor for pyrolysis and carbonization reaction, the reaction temperature is 300°C, and the reaction time is 2h.

[0030] The phosphorus content in the calcium magnesium phosphate fertilizer is 18% (manufacturer, Yunnan Jinda Phosphorus; article number, 543).

[0031] The clay is composed of montmorillonite clay, sepiolite clay and attapulgite clay at a ratio of 2:1:1.

[0032] The preparation method of above-mentioned heavy metal cadmium polluted soil remediation agent:

[0033] (1) limestone is pulverized into the particle that particle diameter is 0.045mm with pulveri...

Embodiment 2

[0041] A remediation agent for heavy metal cadmium polluted soil is prepared from the following raw materials in parts by weight:

[0042]

[0043] Among them, the source of limestone is natural, CaCO 3 Content greater than 98wt%, Fe 2 o 3 The content is less than 0.01% by weight; the preparation process of biochar is as follows: put rice husks, the raw material of biochar, into a pyrolysis reactor for pyrolysis and carbonization reaction, the reaction temperature is 300°C, and the reaction time is 2h.

[0044] The phosphorus content in calcium magnesium phosphate fertilizer is 18%.

[0045] The preparation method of above-mentioned heavy metal cadmium polluted soil remediation agent:

[0046] (1) limestone is pulverized into the particle that particle diameter is 0.053mm with pulverizer;

[0047] (2) The biochar is pulverized into particles with a particle size of 0.053mm with a pulverizer;

[0048] (3) Add limestone particles, biochar particles, calcium magnesium pho...

Embodiment 3

[0054] A remediation agent for heavy metal cadmium polluted soil is prepared from the following raw materials in parts by weight:

[0055]

[0056] Among them, the source of limestone is natural, CaCO 3 Content greater than 98wt%, Fe 2 o 3 The content is less than 0.01% by weight; the preparation process of biochar is as follows: put rice husk as a raw material of biochar into a pyrolysis reactor for pyrolysis carbonization reaction, the reaction temperature is 350°C, and the reaction time is 1.5h.

[0057] The phosphorus content in calcium magnesium phosphate fertilizer is 16%.

[0058]The clay is composed of montmorillonite clay, sepiolite clay and attapulgite clay at a ratio of 1:1:2.

[0059] The preparation method of above-mentioned heavy metal cadmium polluted soil remediation agent:

[0060] (1) limestone is pulverized into the particle that particle diameter is 0.045mm with pulverizer;

[0061] (2) the biochar is pulverized into particles with a particle size o...

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Abstract

The invention relates to a remediation agent for heavy metal cadmium contaminated soil. The remediation agent is prepared from the following raw materials in parts by weight, 100-400 parts of limestone, 100-400 parts of biochar, 10-30 parts of calcium magnesium phosphate fertilizer and 50-200 parts of clay. The sources of the raw materials of the remediation agent are natural, no secondary pollution is caused to soil, the cost is low, and the remediation effect is obvious; the bioavailability of cadmium in a remedied cultivated land is obviously reduced, the environmental quality is obviouslyimproved, and the remediation period is short; the remediation agent has the effect of long-term sustained release, and has the good effect all the time through observation for up to ten years; and apreparation method of the remediation agent is simple, when the remediation agent is applied, applying time is in a normal cultivated land turning-over stage, no extra turning-over step is added, damage to a soil structure is reduced, and the remediation agent has a good application prospect in the aspect of remediation for the large-scale heavy metal cadmium contaminated cultivated land.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a remediation agent for soil polluted by heavy metal cadmium, a preparation method and an application method. Background technique [0002] With the accelerated development of industrialization and urbanization in China, heavy metal pollution such as cadmium in farmland soil in my country is becoming more and more serious. On April 17, 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", pointing out that the total soil pollution rate in the country reached 16.1%, of which the proportions of slight, light, moderate and severe pollution were 11.2%, 2.3%, 1.5% and 1.1%. Inorganic pollutants are the main type of pollution, 82.8% of which are excessive inorganic pollutants, and heavy metals such as cadmium, mercury, arsenic, copper, lead, chromium, zinc, and nickel a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K17/08B09C1/08C09K101/00
CPCC09K17/06C09K17/08B09C1/08C09K2101/00
Inventor 季峻峰魏宁赵良王晗
Owner NANJING UNIV
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