Method for restoring cadmium contaminated soil

Abstract

The invention discloses a method for restoring cadmium contaminated soil, which is to plant nut grass in cadmium contaminated soil. The invention adopts the specific technical scheme that the method for restoring cadmium contaminated soil is characterized by comprising the following steps: A, directly planting nut grass in cadmium contaminated soil or directly sowing seeds of nut grass for growing; and B, remaining the stubble of the planted nut grass and reaping the overground part, or after planting for years, reclaiming the whole plant and then sowing seeds or raising seedlings through cuttings. The method utilizes the principle that the root of nut grass has very strong enrichment to cadmium; and when nut grass is planted in soil, cadmium is absorbed by the root and is transferred to be stored in the overground part, so that the purpose of restoring cadmium contaminated soil can be achieved, and meanwhile, cadmium is prevented from entering the food chain and harming the health of human. Nut grass is a perennial herb, is vigorous in life force, and does not require special management during the growing process; besides, the cost is low, and the operability is strong.

Description

Technical field [0001] The invention relates to a method for repairing soil, in particular to a bioremediation method for soil contaminated by cadmium. Background technique [0002] Cadmium is one of the most toxic heavy metal elements in the environment to plants, animals, and humans, and is listed as one of the eight heavy metal elements that have priority to control pollution in my country. Therefore, the treatment of cadmium contaminated soil has always been a hot research topic that has attracted much attention. The traditional methods of treatment of heavy metal contaminated soil mainly include physical and chemical methods. These methods generally have many problems such as secondary pollution, high cost, and unsatisfactory remediation effect on low-concentration heavy metal contaminated soil. Phytoremediation technology has become a key area of ​​research by soil and environmental workers due to its high efficiency, economic and ecological coordination. The selection of...

AI Technical Summary

Problems solved by technology

Many studies mainly focus on screening and using hyperaccumulator plants to efficiently absorb heavy metals in soil, but because cadmium in soil is not easily absorbed by plants, cadmium hyperaccumulator plants have not been found much, and their biomass is small and their growth is slow. , Disadvantages such as small distribution range

There is a lack of research on practical cadmium pollution remediation