Method of leaching renovating cadmium polluted soil

A cadmium-contaminated soil and leaching technology, which is applied in the restoration of polluted soil and other directions, can solve problems such as inability to elute heavy metals, and achieve the effects of less soil nutrient loss, high restoration efficiency and less environmental risk.
CN109877147AActive Publication Date: 2019-06-14JIANGNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGNAN UNIV
Publication Date
2019-06-14

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Abstract

The invention discloses a method of leaching renovating cadmium polluted soil, and belongs to the technical field of soil renovation. According to the method of leaching renovating the cadmium polluted soil, an amino-acid-hydrochloric-acid ion liquid aqueous solution is used as a leaching agent, the leaching agent is added to the cadmium polluted soil according to the water-soil ratio greater than 2 to 1, oscillation and solid-liquid separation are carried out, and leaching can be finished; compared with an existing leaching agent, the leaching agent used in the soil leaching method is low insoil nutrient loss amount, can increase rapid available phosphorus and nitrogen in the soil, and has certain function of increasing fertility; the leaching method is high in leaching efficiency, theremoving rate of cadmium can reach up to 84%, and the leaching method has the characteristics that the renovating efficiency is high, the maneuverability is high, the environment risk is low and the like.
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Description

technical field

[0001] The invention relates to a method for washing and repairing cadmium-contaminated soil, which belongs to the field of soil repair technology. Background technique

[0002] Since the 20th century, the problem of soil heavy metal pollution has become increasingly serious. The 2014 "National Soil Pollution Survey Bulletin" shows that heavy metal pollution in my country's soil exceeds the standard points accounting for 82.8% of all the exceeding points, among which cadmium (Cd) pollution has become one of the main pollutants of soil inorganic pollution. Cadmium can accumulate and migrate after being absorbed by plant roots. According to statistics, the area of ​​cadmium-contaminated farmland in my country has reached 278,600 hectares, and agricultural products with excessive cadmium content have reached 1.46 billion kilograms per year, and 10% of rice in my country has exceeded the limit standard of 0.2mg / kg ( GB15201294), a serious threat to people's healt...

Claims

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