期刊
CHEMICAL ENGINEERING JOURNAL
卷 264, 期 -, 页码 16-23出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.11.074
关键词
Electrokinetic remediation; Mercury; Heavy metals; Complexing agents
The electrokinetic approach, for the extraction of contaminants from a soil matrix, requires the application of electric fields of suitable intensity, through saturated portions of the soil. When aimed at the removal of species present in metallic form (like mercury) or as poorly conductive minerals (like some sulfides), pollutants require to be preliminary dissolved, an action that can be facilitated by adding appropriate chemicals. In this paper, we show that the presence of an electric field is decisive, possibly because the pollutant-containing particles were able to act as polarizable species (and thus as improper electrodes). At first, tests were performed on small amounts of soil (about 200 g, in plastic bench cells); then, the process was scaled up, testing approximately 400 kg of soil. A 60% of total mercury was removed, in less than 3 months, by adopting specific expedients, in terms of hydraulic control as well as of plant design. (C) 2014 Elsevier B.V. All rights reserved.
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