A device and method for in-situ restoration of heavy metal pollutants in soil
An in-situ remediation, heavy metal technology, applied in the restoration of polluted soil, etc., to achieve the effect of improving migration rate, reducing remediation time, and convenient and compact equipment
Active Publication Date: 2019-07-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Organic chelating agents can complex with heavy metals in soil to form soluble organometallic complexes, which can improve the availability and mobility of heavy metals. Therefore, chelating agents are widely used in soil leaching remediation and induced phytoremediation of heavy metal-contaminated soils. Among them, there are related patents on the application of chelating agents to soil remediation, but there is no patent on the use of chelating agents as electrode fluids for electrodynamic remediation methods
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Embodiment Construction
[0023] The present invention provides a [S,S]-EDDS enhanced electrodynamic method and device for remediating heavy metal pollutants in soil. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0024] The specific device layout is as figure 1 shown.
[0025] The direct current voltage that adopts in the example is 20V, and chelating agent adopts Na3-[S, S]-EDDS (C 10 h 13 N 2 Na 3 o 8 ), the concentration is 0.625mol / L, and the electrode is made of platinum material. The main heavy metal to be treated is lead, and the lead content in the soil is about 8.0×10 -4 mol / L. The main operation steps of the example are as follows:
[0026] 1. Prepare 0.625mol / L Na 3 -[S, S]-EDDS solution, and it is packed in the catholyte storage tank (201), the NaNO of preparation 0.01mol / L 3 solution, and it is packed in the anolyte storage tank (101);
[0027] 2. Turn on the anolyte transfer pump (201) and the cat...
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The invention belongs to the technical field of in-situ restoration of heavy-metal polluted soil, and especially relates to an in-situ restoration apparatus for heavy metal pollutants in soil and a restoration method thereof. The apparatus is composed of an electric-power restoration system, a heavy metal recovery system and an electrolyte cycling reutilization system. The employed in-situ restoration apparatus for heavy metal pollutants in soil and the restoration method thereof are in favor of improving the solubility of heavy metal pollutants in soil and reducing the soil adhering capacity of heavy metal pollutants. Compared with a conventional electric-power restoration method, the advantage that the migration rate of heavy metal ions in soil is improved is provided, and therefore the restoration time is reduced.
Description
technical field [0001] The invention belongs to the technical field of in-situ remediation of soil polluted by heavy metals, in particular to a method and device for in-situ remediation of heavy metal pollutants in soil. Background technique [0002] At present, the research on the application of chelating agents for the remediation of heavy metal pollution in soil, on the one hand, focuses on the chemical extraction rate of heavy metals or the extraction rate of induced plants; on the other hand, it mainly focuses on the residue and migration of chelating agents and the possible soil and Secondary pollution of groundwater. Organic chelating agents can complex with heavy metals in soil to form soluble organometallic complexes, which can improve the availability and mobility of heavy metals. Therefore, chelating agents are widely used in soil leaching remediation and induced phytoremediation of heavy metal-contaminated soils. Among them, there are related patents on the appl...
Claims
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IPC IPC(8): B09C1/08
Inventor 何理申婧李振通张嘉琪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)