A method for efficiently repairing mercury-contaminated soil by leaching and a leaching agent

Abstract

The invention discloses a method for efficient remediation of mercury-contaminated soil by leaching and a leaching agent. The leaching agent is composed of an oxidizing agent, a leaching solution I and a leaching solution II, wherein the oxidizing agent is a persulfate solution, a solute of the leaching solution I is composed of organic acid, iodized salt and chloride salt, and a solute of the leaching solution II is composed of sodium sulfide and sodium hydroxide. The method for leaching the mercury-contaminated soil by adopting the leaching agent comprises the steps that oxidation treatment is carried out on the mercury-contaminated soil, and then the mercury-contaminated soil is sequentially subjected to leaching by adopting the leaching solution I and the leaching solution II. The method has the advantages that efficient elution of mercury with various valence state in the mercury-contaminated soil can be realized, mercury residues are little, in addition, secondary pollution to the environment can be avoided, and the cost is low.

Description

technical field

[0001] The invention relates to a mercury-contaminated soil remediation agent and method, in particular to a method for repairing mercury-contaminated soil by leaching using a special leaching agent, and belongs to the technical field of heavy metal soil treatment. Background technique

[0002] In recent years, with the rapid development of industry and agriculture, a large amount of mercury has been released in the process of production and use, making the soil polluted by mercury more and more serious. The main sources of soil mercury pollution are atmospheric deposition, sewage irrigation, industrial pollution sources (coal-burning, chlor-alkali industry, battery factory, smelting, papermaking and other industries), agricultural pollution sources (use of pesticides and fertilizers), mercury-containing waste (thermometers, waste battery, etc.) mishandled, etc. Mercury and its compounds in the soil can enter the human body through the food chain, causing gr...