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

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...

AI Technical Summary

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 summary, both the traditional remediation method and the phytoremediation technology of heavy metal-contaminated soil have certain limitations. At present, there is no effective method that can fundamentally remove or reduce heavy metals from soil-contaminated environments to acceptable concentrations. Level