期刊
ELECTROCHIMICA ACTA
卷 54, 期 7, 页码 2119-2124出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.09.054
关键词
Electroreclamation; TPHs desorption; Electroosmotic flow; Soil contamination; Electrokinetics
Removal of TPHs from polluted soil by electrokientic reclamation was done by using different electrolytes (anolyte and catholyte). The initial concentration of TPHs in soil was 23,000 ppm and removal efficiencies reached almost 90% for a combination of 0.04M NaOH and 0.1M Na2SO4 in the anode and cathode chambers, respectively. Electroosmotic flow and TPHs desorption were measured under galvanostatic conditions (1.95 mAcm(-2) and electric field < 10V cm(-1)). The study is supported on the electrokinetic transport model for low permeability soils. Electrolytes (anolyte and catholyte) were maintained at constant ionic composition to keep constant boundary conditions, thus launch a pseudostationary state for fluid and charge transport throughout the soil. It was also observed that electrolyte concentration favored TPHs desorption as well as their transport throughout the soil by electroosmotic flow from anode to cathode. Both, electrolytes concentration and wetting solution helped to maintain a constant pH pro. le during electroreclamation, thus a sustained fluid flow from anode to cathode. (C) 2008 Published by Elsevier Ltd.
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