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Composite passivator for repairing cadmium polluted soil and its application method

A technology of cadmium-contaminated soil and passivating agent is applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., to achieve the effects of high efficiency, simple compound method, and improvement of physical and chemical properties

Active Publication Date: 2021-07-30
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved in the present invention is to develop an effective composite passivator for cadmium-contaminated farmland soil, so as to use the system effect to effectively improve the passivation repair effect on polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1

[0023] 1.1 Configuration of soil for cadmium pollution test

[0024] The soil of a farmland in southern Jiangsu was taken, and its pH was measured to be 7.25, and Cd was mixed with CdCl 2 The form is added to the soil to balance in January, and the concentration of Cd in the soil is 3mg / kg.

[0025] 1.2 Preparation of passivating agent

[0026] Commercially available manganese dioxide was mixed with straw ash (wheat straw was burned at room temperature for 2 hours to form a substance with an ash content of 10%) at a weight ratio of 1:1, and mixed until uniform.

[0027] 1.3 Application of passivating agent

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Abstract

The invention relates to a composite passivator for repairing cadmium polluted soil and an application method thereof. The passivating agent is composed of manganese dioxide and straw ash. The application rate of the passivating agent is 16%. The composite passivator formed by the combination of calcium magnesium phosphate fertilizer and straw ash can significantly reduce the concentration of available Cd in the polluted farmland soil. Moreover, the source of the passivating agent disclosed in the present invention is easy to obtain, low in cost, simple in compounding method, and high in compounding efficiency. At the same time, because a large amount of straw ash is used, a large amount of agricultural straw waste can be rationally used, which is an effective circular economic system and is in line with the development direction of circular agriculture. Based on the above advantages, the passivating agent and repair method disclosed in the present invention is a low-cost and high-efficiency soil repair method, which can significantly improve the physical and chemical properties of cadmium-contaminated soil, and has great market promotion value.

Description

technical field [0001] The invention relates to the field of environmental engineering technology and the field of agricultural soil restoration, in particular to the field of restoration of cadmium-contaminated soil, and more specifically to a composite passivator for repairing cadmium-contaminated soil and an application method thereof. Background technique [0002] Cadmium pollution is a kind of heavy metal pollution. At present, in the heavy metal pollution of soil in my country, cadmium pollution can be said to be the main pollution contributing factor. [0003] The impact of cadmium on the human body is the same as that of many heavy metals. After entering the human body, it will accumulate in the body, damage the kidney function, and cause symptoms such as systemic pain. It is a typical "three-cause" substance. [0004] Therefore, cadmium pollution control has become a key issue in the field of agriculture and the environment. [0005] The purpose of heavy metal cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02B09C1/08C09K101/00
CPCB09C1/08C09K17/02C09K2101/00
Inventor 童非张振华高岩张维国樊广萍陈未余垚刘丽珠
Owner JIANGSU ACAD OF AGRI SCI
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