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Leaching agent and leaching method for repairing heavy metal contaminated soil

A technology of polluted soil and heavy metals, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problem of low complexation ability of natural low-molecular organic acids, damage to soil physical and chemical properties, low biodegradability, etc. No secondary pollution risk, low cost and strong applicability

Inactive Publication Date: 2015-08-19
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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AI Technical Summary

Problems solved by technology

In the prior art, artificial chelating agents and surfactants have problems such as low biodegradability and easy residues in the soil to cause secondary pollution. Inorganic acid leaching agents destroy the physical and chemical properties of soil and the complexing ability of natural low-molecular organic acids. low level problem

Method used

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Embodiment 1

[0026] A leaching agent for remediating heavy metal polluted soil of the present invention, the leaching agent includes oxalic acid solution and rhamnolipid solution. Wherein, the oxalic acid solution and the rhamnolipid solution are used separately, the oxalic acid solution is the first eluent, and the rhamnolipid solution is the second eluent. The molar concentration of oxalic acid solution is 0.2mol / L (0.1mol / L~0.2mol / L can be implemented), the molar concentration of rhamnolipid solution is 0.01mol / L (0.01mol / L~0.05mol / L can be implementation).

[0027] A step-by-step leaching method (that is, the method of using the above-mentioned leaching agent) using the leaching agent of the present embodiment for repairing heavy metal-contaminated soil, comprising the following steps:

[0028] (1) Collect 50 kg of soil samples from a mining area in Chenzhou City, Hunan Province. The content of As, Pb, Zn, Cd, and Cu in soil samples was determined according to the heavy metal detecti...

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Abstract

The invention discloses a leaching agent and a leaching method for repairing heavy metal contaminated soil. The leaching agent comprises oxalic acid solutions and rhamnolipid solutions. The leaching method includes the steps: preparing the leaching agent for repairing heavy metal contaminated soil; adding the oxalic acid solutions into the heavy metal contaminated soil to uniformly mix, and filtering leaching liquid after the oxalic acid solutions and the heavy metal contaminated soil are reacted; adding the rhamnolipid solutions into the soil treated by the oxalic acid solutions to uniformly mix, filtering leaching liquid after the rhamnolipid solutions and the soil treated by the oxalic acid solutions are reacted, and repairing the heavy metal contaminated soil. The leaching agent and the leaching method are low in cost, safe, efficient and high in applicability, soil characteristics can not be intensively broken, the step-by-step leached soil can be directly backfilled, and the risk of secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a leaching agent and a rinsing method for repairing heavy metal polluted soil. Background technique [0002] At present, the overall situation of my country's soil environment is not optimistic. The soil pollution in some areas is serious, the soil environment quality of cultivated land is worrying, and the soil environment problem of industrial and mining wasteland is particularly prominent. The research on remediation of heavy metal-contaminated soil has become a hot scientific issue and frontier field at home and abroad. [0003] The current heavy metal-contaminated soil remediation technologies are mainly physical and chemical remediation technology and phytoremediation technology, which are mainly summarized into two types in terms of mechanism: one is to change the existing form of heavy metals in the soil, so that it changes from an active state to a stabl...

Claims

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Application Information

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IPC IPC(8): C09K17/14B09C1/08
CPCC09K17/14B09C1/08
Inventor 蒋晓云何劲松李军易亚男
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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