Treatment method for heavy metal contaminated soil

Abstract

The invention discloses a treatment method for heavy metal contaminated soil, relating to the technical field of contaminated soil recovery. The treatment method comprises the following steps: (A) crushing to-be-treated contaminated soil; and (B) scattering a powder agent in a heavy mental soil treatment agent into the to-be-treated contaminated soil in the step (A), and spraying a water agent in the heavy mental soil treatment agent until the soil is drenched after the crushed soil and the powder agent is mixed uniformly, wherein the weight ratio of the applied heavy mental soil treatment agent to the contaminated soil is 1 to (5-6). The heavy metal contaminated soil is treated by virtue of the treatment method, so that the content of heavy metal in the soil can be rapidly decreased, the soil structure is changed, and the propagation of microorganisms is increased.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil, in particular to a treatment method for heavy metal polluted soil. Background technique [0002] Soil is one of the main natural resources that human beings rely on for survival, and it is also an important part of the human ecological environment. With the rapid development of industry and mining, soil heavy metal pollution is becoming more and more serious. Heavy metals refer to metals with a density greater than 4 (g / cm3), which mostly exist in the form of compounds in nature. With the mining, smelting, processing and mulberry leaf manufacturing of heavy metals, many heavy metals such as lead, cadmium, mercury, etc. Into the atmosphere, water or soil, causing serious heavy metal pollution. Soil is an important natural resource for human survival and development. Heavy metal pollution in soil will directly affect human health and the entire terrestrial ecosystem. Heavy me...

AI Technical Summary

Problems solved by technology

Heavy metal pollution is different from organic pollution. Heavy metals themselves are difficult to degrade. Heavy metals entering the soil cannot be decomposed by microorganisms and accumulate in the soil for a long time. Some of them are absorbed by crops and eventually enter the human body through the food chain. There are certain ecological risks. Heavy metals are easy to be enriched by plants or animals. At present, the area of ​​cultivated land polluted by heavy metals such as lead, cadmium, and mercury in my country is nearly 10 million hectares, accounting for about 1 / 5 of the total cultivated land area, and the amount of grain polluted by heavy metals reaches as many as 10 million every year. tons, resulting in huge economic losses

At present, the commonly used soil heavy metal pollution treatment adopts agricultural state engineering measures to breed special plants and microorganisms on the soil polluted by heavy metals, and these special plants and microorganisms absorb or degrade the heavy metals in the soil, so as to achieve the purpose of purifying the soil. purpose, but this method takes a long time to treat and is slow to take effect, which will make the treated soil lose its use value for a long time

Some people have proposed to use physical and physical chemical principles to treat heavy metal-contaminated soil, such as isolation method, cleaning valve, heat treatment, electrochemical method, etc., which can quickly, thoroughly and stably solve the problem of soil heavy metal pollution, but this method has high one-time investment and no Return on investment, it is difficult to promote the application in daily life