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Method for removing soluble heavy metal ions in situ

A heavy metal ion, soluble technology, used in the improvement of process efficiency, the restoration of polluted soil and other directions, can solve the problems of low energy consumption and large processing energy consumption, achieve low energy consumption, high efficiency, and overcome the inability to eliminate electrode electrodes. the effect of

Inactive Publication Date: 2010-09-22
中钢集团武汉安全环保研究院有限公司 +2
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  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of excessive energy consumption and soluble heavy metal ions caused by three kinds of electrode polarization and passivation phenomena when the existing constant direct current method migrates soluble heavy metal ions during the electrodynamic in-situ restoration process of heavy metal polluted soil. ions are OH - "Solidification" in the soil or materials, resulting in high energy consumption and low efficiency of the method, a targeted method for removing soluble heavy metal ions by pulse electrokinetics to eliminate electrode polarization

Method used

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  • Method for removing soluble heavy metal ions in situ
  • Method for removing soluble heavy metal ions in situ
  • Method for removing soluble heavy metal ions in situ

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0089] Comparison of 120h remediation effect of two methods on copper ion polluted soil

[0090] In order to ensure the accuracy of the comparison experiment, copper ions with a content of 500 mg / kg were specially formulated into the same soil without heavy metal pollution in a uniform wet state to form Cu +2 The test soil sample with a content of 500mg / kg was dried for use, and then under the premise of ensuring that the initial conditions and operation steps were identical except for the different power sources, the pulse electrokinetic method and the direct current electrokinetic method were tested with a long running time of 120h. The efficiency of removing heavy metal ions was compared.

[0091] 1) Power supply operating conditions:

[0092] DC power supply: the voltage gradient is 1.0v / cm; after the first start-up, the initial voltage gradient is maintained and the continuous operation time is 120h (5d).

[0093] Pulse power supply: the input port is the mains input po...

example 2

[0100] Comparison of 120h removal efficiency of heavy metal ions in excess activated sludge by two methods

[0101] Similarly, in order to ensure the accuracy of the comparison experiment, a certain amount of copper ions was prepared in the uniform wet state of the remaining activated sludge after dehydration taken from the same sewage plant to form a test mud sample with a total content of heavy metal ions of 700mg / kg. , and then under the premise of ensuring that the initial conditions are identical except for the different power sources, a comparative experiment was carried out on the removal efficiency of heavy metal ions by the pulse electrokinetic method and the direct current electrokinetic method with a long running time of 120 h.

[0102] 1) Power supply operating conditions:

[0103] DC power supply: the voltage gradient is 1.0v / cm; after the first start-up, the initial voltage gradient is maintained and the continuous operation time is 120h (5d).

[0104] Pulse pow...

comparative experiment example 2

[0189] Removal of soluble heavy metal ions in activated sludge

[0190] The following experiments are a summary of the experimental results of a series of activated sludge samples with different heavy metal contents and different operating conditions.

[0191] The comparative experiments of the two methods running continuously for 24 hours at the same time show that: under the condition that the voltage gradient applied by the DC power supply to the sample is equal to the value of the pulse peak voltage gradient applied by the pulse power supply to the sample under the same original condition, the pulse electrokinetic method has no effect on the sample. The removal efficiency of soluble heavy metal ions in activated sludge is always better than that of direct current electrokinetic removal method. The specific series of examples are: while Cu in activated sludge +2The content range is 0.002%-0.1%, and the setting value range of electric operation parameters is DC power supply...

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Abstract

The invention relates to a method for removing soluble heavy metal ions in situ from soil or mud / powdery deposits. In the method, a negative electrode and a positive electrode are directly inserted into the soil or a material deposit containing the soluble heavy metal ions, the driving power source of the negative electrode and the positive electrode is a pulse power source, and the positive of the pulse voltage output by the pulse power source is connected with the positive electrode, while the negative is connected with the negative electrode. The method provides the pulse power source capable of generating high-impact electric field force, eliminates three electrode polarization phenomena which cannot be overcome by the conventional DC kinetics method, has no secondary pollution on environment, and greatly improves the efficiency of removing the heavy metal ions from the soil or mud / powdery waste materials through in-situ migration by adopting the conventional DC kinetics method.

Description

technical field [0001] The invention relates to a method for in-situ removal of soluble heavy metal ions from soil or muddy powder deposits. Background technique [0002] Nowadays, the problem of environmental pollution is becoming more and more serious, and more and more arable land is polluted by heavy metals. Effective removal of polluted heavy metal ions from soil has become a key issue for soil ecological restoration. Electrokinetic in-situ remediation of soil contaminated by heavy metals is a soil in-situ remediation method with low cost and minimal secondary damage to the environment that has only been developed in the past ten years at home and abroad. [0003] At present, a large amount of muddy and powdery materials discharged from human industrial and living activities and environmental restoration activities are piled up like mountains, occupying a lot of cultivated land. Moreover, most of these waste materials contain a large amount of soluble heavy metal ions,...

Claims

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Application Information

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IPC IPC(8): C22B7/00B09C1/08
CPCY02P10/20
Inventor 罗亚田董有查振林张智良
Owner 中钢集团武汉安全环保研究院有限公司
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