Remediation agent for soil polluted by heavy metals and remediation method thereof

Abstract

The invention discloses a remediation agent for soil polluted by heavy metals. The remediation agent comprises the following ingredients in parts by weight: 23.5-25.5 parts of attapulgite, 1.8-2.2 parts of polyamide, 2.4-2.6 parts of sodium humate, 6.2-6.8 parts of a metal chelating agent, 1.5-2.5 parts of biochar, 13.5-15.5 parts of nano-silicon dioxide, 3.5-4.5 parts of poly ferric chloride, 3.5-4.5 parts of peat and 3.2-3.8 parts of calcium peroxide. The invention further discloses a remediation method of the remediation agent for soil polluted by heavy metals. The remediation method includes the steps of placing the remediation agent in a nylon mesh bag with 15-25 meshes, burying the nylon mesh bag in soil with the depth of from 15-35 cm, and removing the bag from the soil after absorption and exchange. The remediation agent, which is obtained from the combination of attapulgite and various functional materials, applies to the remediation of soil polluted by heavy metals, has the advantage of simple and convenient remediation method, and is suitable for industrial production; heavy metals in the soil can be eliminated permanently through absorption and exchange; the purpose of remediation of the soil polluted by heavy metals is achieved; the leaching concentration, mobility and toxicity of heavy metals in soil are reduced.

Description

technical field [0001] The invention belongs to the technical field of soil restoration, and relates to a heavy metal soil restoration agent and a restoration method thereof. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Heavy metal pollution in farmland soil is extremely harmful. Heavy metal pollution in soil will not only reduce crop yield and quality, but also enter the human body through the soil-plant system and the food chain, endangering human health and life safety. Soil heavy metal pollution has the characteristics of concealment, hazard lag, long-term nature, and bioaccumulation of heavy metals in the biological chain. These determine that if the understanding and treatment of soil heavy metal pollution are delayed, it will bring unpred...

AI Technical Summary

Problems solved by technology

[0005] Traditional remediation methods for soil heavy metal pollution, such as landfill, leaching, and electrochemical methods, require a large amount of engineering, high cost, and are difficult to use on a large scale, and often lead to the destruction of soil structure and the leaching of certain nutrients