Method for repairing heavy-metal-contaminated soil with biomedical carbon and plants

Abstract

The invention provides a method for repairing heavy-metal-contaminated soil with biomedical carbon and plants. The method comprises the following steps that the content of heavy metal in the soil is detected, and the planting density of edible amaranth is determined according to the content of the heavy metal in the soil; soil covering processing is performed on the surface of the contaminated soil so that the edible amaranth can be planted; the edible amaranth is planted on the soil obtained after soil covering processing; and the contaminated degree of the soil is detected when the red edible amaranth is harvested, and secondary planting or stopping planting of the red edible amaranth is selected according to the detection result. Compared with the prior art, the method has the following beneficial effects that through the steps that the content of the heavy metal in the soil is detected, the planting density of the edible amaranth is determined according to the content of the heavy metal in the soil, and then the edible amaranth is planted, the content in the heavy metal in the soil can be effectively reduced, and heavy metal contamination of the soil is reduced.

Description

technical field [0001] The invention relates to a method for repairing heavy metal polluted soil by using biological carbon and plants, and belongs to the field of crop planting. Background technique [0002] Heavy metals refer to metals with a specific gravity greater than 5 (generally refers to metals with a density greater than 4.5 grams per cubic centimeter), and also refer to metals with an atomic weight greater than 55. Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, waste gas discharge, sewage irrigation and the use of heavy metal products that exceed the standard, resulting in varying degrees of increase in the content of heavy metals in the environment, which exceeds the normal range of national safety standards, can directly endanger human health, and lead to deterioration of environmental quality . In 2011, my country's first "Twelfth Five-Year" special plan -...

AI Technical Summary

Problems solved by technology

However, this approach requires high costs, so it cannot be the best choice for the restoration approach. 2. Use special plants to absorb heavy metals in the soil, and then remove the plants or use engineering techniques to change the heavy metals into soluble and free states, and then After leaching, the heavy metals in the eluate are collected, so as to achieve the dual purpose of recycling heavy metals and reducing heavy metals in the soil