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Elution method for heavy metals in soil

An elution method and heavy metal technology, applied in the field of soil heavy metal pollution treatment, can solve the problems of heavy metal-contaminated soil remediation difficulty, high remediation cost, and long remediation time, and achieve short remediation time, good directionality, and reduced usage Effect

Inactive Publication Date: 2014-01-08
廖柏寒 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of heavy metal-contaminated soil remediation difficulty, long remediation time, and high remediation cost, and provide an elution method with short elution time, less usage of eluent EDTA, and good elution effect

Method used

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Examples

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Effect test

Embodiment 1

[0020] A method for elution of heavy metals in soil. Contaminated soil samples were collected from farmland near a mining area in Hengyang City, Hunan Province. The soil samples were air-dried to remove impurities, and then ground and filtered through 2 mm nylon sieve and 0.149 mm nylon sieve respectively. The determined contents of lead, cadmium, copper and zinc were 1067 mg / kg, 28.79 mg / kg, 79.03 mg / kg and 1571 mg / kg, respectively. mg / kg, which belongs to moderately polluted soil by heavy metal lead, and heavily polluted soil by cadmium and zinc. After the above pretreatment, 10.0 g of soil samples were weighed and added to a 250 mL centrifuge bottle, and the subsequent elution steps were as follows:

[0021] Step 1, the configuration concentration of eluent EDTA is 0.02 mol / L;

[0022] Step 2, the mixing of eluent and polluted soil, the solid-to-liquid ratio is 1:15, under the condition that the above-mentioned soil sample is 10.0 g, the Na 2 The volume of EDTA solution i...

Embodiment 2

[0028] A method for elution of heavy metals in soil. Contaminated soil samples were collected from farmland near a mining area in Hengyang City, Hunan Province. The soil samples were air-dried to remove impurities, and then ground and filtered through 2 mm nylon sieve and 0.149 mm nylon sieve respectively. The contents of lead, cadmium, copper and zinc were determined to be 3407 mg / kg, 8.85 mg / kg, 119.8 mg / kg and 1114 mg / kg, respectively. mg / kg, which belongs to heavily polluted soil with heavy metals lead, cadmium and zinc. After the above pretreatment, 10.0 g of soil samples were weighed and added to a 250 mL centrifuge bottle, and the subsequent elution steps were as follows:

[0029] Step 1, the configuration concentration of eluent EDTA is 0.05 mol / L;

[0030] Step 2, the mixing of eluent and polluted soil, the solid-to-liquid ratio is 1:20, under the condition that the above-mentioned soil sample is 10.0 g, the Na 2 The volume of EDTA solution is 200mL;

[0031] Step ...

Embodiment 3

[0036] A method for elution of heavy metals in soil. Contaminated soil samples were collected from farmland near a mining area in Chenzhou City, Hunan Province. The soil samples were air-dried to remove impurities, and then ground and filtered through 2 mm nylon sieve and 0.149 mm nylon sieve respectively. The determined contents of lead, cadmium, copper and zinc were 829.5 mg / kg, 6.78 mg / kg, 101.9 mg / kg and 622.2 mg / kg, respectively. mg / kg, belonging to moderately polluted soil by heavy metals lead, copper and zinc, and heavily polluted by cadmium. After the above pretreatment, 10.0 g of soil samples were weighed and added to a 250 mL centrifuge bottle, and the subsequent elution steps were as follows:

[0037] Step 1, the configuration concentration of eluent EDTA is 0.02 mol / L;

[0038] Step 2, the mixing of eluent and contaminated soil, the solid-to-liquid ratio is 1:10, under the condition that the above-mentioned soil sample is 10.0 g, the Na 2 The volume of EDTA solut...

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Abstract

The invention belongs to the technical field of pollution treatment of heavy metals in soil and specifically discloses an elution method for the heavy metals in the soil. The elution method comprises the following steps: collecting polluted soil, removing impurities, grinding, filtering by a screen mesh, performing other types of pretreatment before elution, determining the pollution level of the soil after pretreatment of a polluted soil sample, mixing the polluted soil with an elution agent, then performing elution, centrifugating after elution, performing filtration treatment and the like. By utilizing the method disclosed by the invention, heavy metals, namely lead, cadmium, copper, zinc and other heavy metal elements in the soil can be simultaneously effectively removed, the using quantity of the elution agent is small, the influence degree of the elution agent on physical and chemical properties is reduced, the repair time is short, and the method is suitable for repairing the large-area moderate-severe heavy metal composite polluted soil.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution treatment, and specifically discloses a method for elution of heavy metals in soil. Background technique [0002] In recent years, soil heavy metal pollution has become an environmental problem of widespread concern. Among many treatment methods for soil heavy metal pollution, soil leaching and remediation technology is an effective technology for the treatment of contaminated soil, which has the advantages of stable remediation effect, easy system control and waste reduction, and is suitable for rapid remediation of affected areas. High concentrations of heavy metals and organic matter contaminate soil and sediments. [0003] Soil leaching technology is to transfer the heavy metals in the soil to the eluent through vibration, so as to achieve the purpose of removing heavy metals in the soil. However, the long elution time and high concentration of eluent may cause secondary p...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 廖柏寒周航邱琼瑶曾敏
Owner 廖柏寒
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