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Heavy metal compound contaminated soil remediating compound eluant and using method thereof

A compound pollution and soil remediation technology, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of ineffective soil remediation, reduced migration ability and biological effectiveness, etc., and achieve remediation Wide application range, low cost and obvious effect

Inactive Publication Date: 2017-11-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Remediation methods related to heavy metal pollution in soil are mainly leaching method, solidification stabilization method and phytoremediation, etc. These soil remediation methods are mainly based on two methods, one is to remove heavy metals from the soil to achieve the purpose of cleaning; the second is to Fix heavy metals in soil, reduce their migration ability and bioavailability
Chelating agents combine with heavy metal ions in the soil to form complexes, change the form of heavy metals in the soil, and convert insoluble heavy metals into soluble ones, thereby improving the leaching efficiency and achieving the purpose of removing heavy metals in the soil; but a single chelating agent is harmful to the soil. The repair effect is not obvious

Method used

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  • Heavy metal compound contaminated soil remediating compound eluant and using method thereof
  • Heavy metal compound contaminated soil remediating compound eluant and using method thereof
  • Heavy metal compound contaminated soil remediating compound eluant and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0027] Get the reddish-brown soil of the silty clay of a certain electroplating factory in Wuhan City, Hubei Province, and the soil properties are as shown in table 1; Adopt the composite leaching agent of the embodiment of the present invention one and its use method to repair the soil collected, take the soil Sample 5g, the heavy metal content before and after leaching is shown in Table 2.

[0028] Table 1 Physical and chemical properties of the tested soil samples

[0029]

[0030] Table 2 Comparison of heavy metal content before and after leaching

[0031]

[0032]

[0033] After oscillating leaching repair of the compound system, the content of the five heavy metals increased or decreased in various forms, but the total amount decreased, that is, all kinds of heavy metals were removed to a certain extent. All forms of Pb, Cu, Ni and Zn have been effectively reduced, and the content of heavy metals in the oxidation state of iron and manganese has been removed the...

Embodiment 3

[0036] The yellow-brown soil of silty clay in Nanwang Mountain, Wuhan City, Hubei Province was taken, and the heavily polluted soil was simulated according to the "Soil Environmental Quality Standard" (GB15618-2008), and a total of 5 heavy metals were added, namely Cu, Pb, Zn, Ni, Cr ; The heavy metals in the simulated polluted soil are shown in Table 3.

[0037] Table 3 The basic physical and chemical properties of the original soil and the content of heavy metals added

[0038]

[0039] Refer to attached image 3 , take 5g of the above soil sample and use the compound leaching agent of Example 1 and its usage method to carry out soil remediation. The compound eluent showed obvious removal effect on the five heavy metals in the simulated contaminated soil, and the elution rates of Cu, Pb, Zn, Ni, and Cr were 79.2%, 90.8%, 90.1%, 86.8%, and 50.2%, respectively. ; It shows that the compound leaching agent of Example 1 of the present invention and its method of use can effe...

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Abstract

The invention discloses a heavy metal compound contaminated soil remediating compound eluant and a using method thereof. The compound eluent is obtained by compounding two common eluants, namely 0.08mol / L of ethylenediaminetetraacetic acid (EDTA) and 0.4mol / L of citric acid (CA), according to a volume ratio of 1:1, and adjusting pH to 4.0 by using 0.1mol / L of NaOH. The compound eluent has relatively high efficiency of removing heavy metals in heavy metal compound contaminated soil, and the used compound eluent is simple in preparation method, low in cost and strong in practicality; in addition, eluting wastewater can be recycled after being treated, so that the pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in soil, in particular to a compound leaching agent for remediating soil compounded by five heavy metals such as Cu, Pb, Zn, Ni and Cr, and a method for using the same. Background technique [0002] Soil heavy metal pollution has attracted widespread attention. Due to the characteristics of long-term, concealment, irreversibility, high toxicity and inability to be degraded by microorganisms, heavy metal pollution will directly or indirectly affect human health after entering the soil and accumulating. . Remediation methods related to heavy metal pollution in soil are mainly leaching method, solidification stabilization method and phytoremediation, etc. These soil remediation methods are mainly based on two methods, one is to remove heavy metals from the soil to achieve the purpose of cleaning; the second is to Fix heavy metals in soil, reduce their migration ability a...

Claims

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Application Information

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IPC IPC(8): C09K17/14B09C1/08
CPCC09K17/14B09C1/08
Inventor 罗泽娇刘仕翔胡三荣
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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