Method for applying paddy rice in repairing soil contaminated by heavy metal cadmium

A technology for cadmium-contaminated soil and heavy metals, applied in the field of remediation of heavy metal cadmium-contaminated soil, can solve the problems of not being widely used, heavy metal removal, restriction, etc., and achieve the effect of low cost, remediation of cadmium pollution, and large capacitance

Inactive Publication Date: 2012-07-11
SICHUAN AGRI UNIV
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Problems solved by technology

However, it is limited to the characteristics of the materials used for repair and cannot be widely used
Therefore, hyperaccumulator plants are the most important factor affecting phytoremediation, and hyperaccumulator plants have their own shortcomings, which are greatly limited in practical applications.
In

Method used

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Example Embodiment

[0014] The invention will be further described below in conjunction with specific embodiments.

[0015] A method of using rice to repair heavy metal cadmium-contaminated soil is realized by the following steps: 1. Planting rice seedlings in cadmium-contaminated soil; 2. According to conventional field management; 3. Harvesting whole plants of rice; 4. Harvesting the rice obtained Burning ash; 5. Use rice ash to extract heavy metals; this rice has the characteristics of high accumulation of cadmium.

[0016] The experiment was carried out in the Teaching and Research Park of Sichuan Agricultural University. Refer to the background value of the mass fraction of cadmium in the main agricultural soils in my country, which is between 0.01-1.34mg / kg and the average is 0.12mg / kg. The test soil is the control soil (soil A: the total amount of cadmium is 0.37mg / kg, the effective amount is 0.083 mg / kg) and two soils with different levels of cadmium pollution (soil B: the total amount of cadm...

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Abstract

The invention relates to a method for repairing soil contaminated by the heavy metal cadmium and specifically to a method for applying paddy rice with high accumulation of cadmium in repairing soil contaminated by the heavy metal cadmium. The method comprises the following steps: 1, planting paddy rice seedlings in soil contaminated by cadmium; 2, managing the seedlings as managing a conventional big field; 3, harvesting the whole plant of the paddy rice; 4, burning and ashing the harvested paddy rice; and 5, extracting the heavy metal from an ashing product of the paddy rice. According to the invention, since the paddy rice with high accumulation of cadmium has accumulation characteristic to cadmium, the paddy rice is planted in soil contaminated by cadmium to absorb and accumulate cadmium and to transfer most cadmium to the aboveground part of the paddy rice, thereby achieving the purpose of repairing soil.

Description

technical field [0001] The invention relates to a method for repairing soil polluted by heavy metal cadmium, in particular to a method for repairing soil polluted by heavy metal cadmium by using rice with high accumulation of cadmium. Background technique [0002] Cadmium (Cd) is a non-essential element for the growth and development of animals and plants. It is listed as the "first of the five poisons" because of its high mobility, high toxicity, and the largest polluted area. Cadmium will not only cause various physiological toxic effects on plants, but more seriously, the absorption and enrichment of cadmium by plants will cause potential harm to human health through the food chain. Therefore, reducing the high content of cadmium in soil to an acceptable concentration level is of great significance for controlling soil cadmium pollution. Traditional remediation methods for heavy metal-contaminated soil include physical methods (leaching method, guest soil method, adsorpt...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 郑子成李廷轩余海英张锡洲王永东郑陶张洪江
Owner SICHUAN AGRI UNIV
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