Leaching agent for repairing heavy metal cuprum polluted soil and method thereof

A technology for copper pollution and heavy metals, which is applied in the field of soil pollution control, can solve the problems of high leaching repair cost and secondary pollution, and achieve the effects of low repair cost, reduced dosage and wide sources.

Inactive Publication Date: 2008-07-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems in the remediation method of heavy metal-contaminated soil that easily cause secondary pollution, but the cost of leaching and repairing a large amount of EDDS is high, the present invention provides a leaching agent and method for remediating heavy metal-copper-contaminated soil, which is used for heavy metal-contaminated soil The repair can reduce the usage of EDDS, the repair effect is good, and the environmental risk after rinsing repair is reduced

Method used

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  • Leaching agent for repairing heavy metal cuprum polluted soil and method thereof
  • Leaching agent for repairing heavy metal cuprum polluted soil and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: measure heavy metal copper content in the soil, according to the content of copper, according to the amount ratio of EDDS / Cu substance, get a certain amount of EDDS reagent, prepare eluent with distilled water, 0.01mol / l NaNO 3 The solution adjusts the ion concentration of the eluent to 0.01mol / l, 0.1mol / l HCl and 0.1mol / l NaOH to adjust the pH of the eluent system to 3-9 respectively.

Embodiment 2

[0023] Embodiment 2: Determining the content of heavy metal copper in the soil, according to the content of heavy metal copper in the soil, take an appropriate amount of ethyl lactate reagent, so that the molar ratio of ethyl lactate / Cu is 1-50:1. Prepare eluent with distilled water, 0.01mol / l NaNO 3 The solution adjusts the ion concentration of the eluent to 0.01mol / l, 0.1mol / l HCl and 0.1mol / l NaOH to adjust the pH of the eluent system to 3-9 respectively.

Embodiment 3

[0024] Embodiment 3: measure the content of heavy metal copper in soil, according to the content of heavy metal copper in soil, get EDDS and ethyl lactate reagent respectively and form eluent, the amount ratio of EDDS / ethyl lactate substance wherein is 1: 1~ 25. According to the molar ratio of EDDS / Cu substance is 1:1, and the molar ratio of ethyl lactate / Cu substance is 1-25:1, prepare eluent with distilled water, 0.01mol / l NaNO 3 The solution adjusts the ion concentration of the eluent to 0.01 mol / l, and adjusts the pH of the eluting system to 3 with 0.1 mol / l HCl and 0.1 mol / l NaOH, respectively.

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Abstract

The invention discloses an eluent for the remediation of metal Cu contaminated soil and a leaching method, pertaining to the field of soil environment remediation. The eluent for the remediation of metal Cu contaminated soil comprises the ethylenediaminedisuccinic acid EDDS and ethyl lactate with the wt proportion by 1: 1-25. The remediation method is that the content of metal Cu in the contaminated soil is tested primarily; the metal Cu contaminated soil is put into a leaching column; the EDDS and ethyl are mixed to form a eluent, and an eluent is prepared with the proportion between eluent and soil weight by 1-50:1; (4) the prepared eluent is leached from top to bottom into the column, the leachate is collected from the bottom of the column. The EDDS of the invention has wide source and is obtained with low cost; the EDDS consumption is reduced, and the remediation cost is lowered; both the ethyl lactate and EDDS can be bio-degenerated, thereby reducing the environmental risk after leaching remediation.

Description

technical field [0001] The invention relates to the field of soil pollution control in environmental protection, in particular to a leaching agent composition for repairing soil heavy metal copper pollution and a method for repairing heavy metal copper polluted soil. Background technique [0002] With the rapid growth of population, the continuous expansion of industrial production scale and the rapid development of urbanization, the pollution of heavy metals in soil is increasing day by day. Heavy metals in polluted soil can not only cause water pollution through migration into surface water and groundwater, seriously affecting environmental quality and sustainable economic development, but also can be absorbed by plants into the food chain and directly threaten human health. The remediation of heavy metal pollution in soil has physical, chemical, biological and other methods. The leaching method uses chemical or biological test leaching agents to enhance the mobility of he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/14
Inventor 郭红岩王巍王晓蓉孙媛媛尹颖
Owner NANJING UNIV
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