Stabilization treatment method for heavy metal copper in polluted soil

A technology for stabilizing and polluting soil, applied in the restoration of polluted soil, etc., to achieve the effects of low cost, environmentally friendly operation, and easy operation

Inactive Publication Date: 2011-05-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] So far, there is no research report on the use of iron wire as an additive to stabilize heavy metal copper in polluted soil by microwave radiation.

Method used

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  • Stabilization treatment method for heavy metal copper in polluted soil
  • Stabilization treatment method for heavy metal copper in polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take heavy metal copper-contaminated soil, put it in a cool and dry place for 15 days to air-dry, pass through a 40-mesh sieve after grinding, place the sieved dry soil in a quartz container, and insert three iron wires with a diameter of 0.28mm vertically, Arrange the iron wires in a ring;

[0019] (2) Place the above-mentioned quartz container in a microwave instrument, start the microwave under a nitrogen atmosphere of 50ml / min, control the microwave power to be 560w, and perform a microwave action time of 20min;

[0020] (3) Stop the microwave action, adjust the nitrogen flow rate to 5ml / min, make the soil naturally cool to room temperature in this nitrogen atmosphere, take out the iron wire from the contaminated soil, wash it with an appropriate amount of hydrochloric acid for reuse; transfer the soil to another container, The copper stabilization efficiency is above 70% through the determination and analysis of USEPA's 1311 toxicity leaching procedure.

Embodiment 2

[0022] (1) Take heavy metal copper-contaminated soil, put it in a cool and dry place for 15 days to air-dry, pass through a 40-mesh sieve after grinding, place the sieved dry soil in a quartz container, and insert three iron wires with a diameter of 0.45mm vertically. Arrange the iron wires in a ring;

[0023] (2) Place the above-mentioned quartz container in a microwave instrument, start the microwave under a nitrogen atmosphere of 50ml / min, control the microwave power to 700w, and perform a microwave action time of 20min;

[0024] (3) Stop the microwave action, adjust the nitrogen flow rate to 5ml / min, make the soil naturally cool to room temperature in this nitrogen atmosphere, take out the iron wire from the contaminated soil, wash it with an appropriate amount of hydrochloric acid for reuse; transfer the soil to another container, The copper stabilization efficiency is nearly 70% as determined by USEPA's 1311 Toxic Leaching Procedure.

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Abstract

The invention belongs to the technical field of treatment of heavy metal polluted soil, and in particular relates to a stabilization treatment method for heavy metal copper in polluted soil. The method comprises the following steps of: air-drying the heavy metal polluted soil at room temperature, and inserting 3 to 8 iron wires with the diameter of 0.28 to 0.90mm into the polluted soil; performing microwave radiation on the soil in nitrogen atmosphere for 5 to 20 minutes, controlling microwave power to be 200 to 800w and controlling nitrogen flow rate to be 10 to 100mL/min in the nitrogen atmosphere; and naturally cooling the soil to room temperature in the nitrogen atmosphere at the nitrogen flow rate of 1 to 10mL/min, taking the iron wires out, washing for recycling, and obtaining microwave stabilized heavy metal copper polluted soil. The process has good effects when applied to the stabilization of the heavy metal copper in the polluted soil. The method can realize the stabilization treatment of the heavy metal copper polluted soil, and has the advantages of good stabilization effect, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of heavy metal polluted soil treatment, and in particular relates to a method for stabilizing heavy metal copper in polluted soil. Background technique [0002] With the improvement of environmental standards and the development of heavy metal-contaminated soil treatment technology in recent years, the treatment methods of heavy metal pollution in sludge soil have received more and more attention. Due to the characteristics of heavy metals and the effect of soil components on heavy metals, under certain conditions, specific technologies can be used to stabilize heavy metals in soil, reduce the activity of heavy metals, and realize the control and treatment of heavy metal pollution in soil. Usually, the effect of stabilizing with chemical reagents is better, but the chemical reagent method greatly changes the components and even the pH of the soil, which will have a greater impact on the soil in the long run....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/06
Inventor 张华朱志良仇雁翎赵建夫
Owner TONGJI UNIV
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