Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 34, Issue 10, Pages 1645-1651Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.201100226
Keywords
Dielectric heating; Radio frequency; Resistive heating; Soil remediation; Soil vapor extraction
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Funding
- German Federal Ministry of Education and Research
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In situ electrical heating of soil was studied applying different frequencies: low-frequency energy for resistive heating and radio-frequency energy for dielectric heating. Steep temperature gradients were observed for each heating mode under the condition of the coexistence of saturated and unsaturated soil zones. By combining the two heating modes, this undesired effect can be avoided, thus allowing efficient soil remediation especially when organic phases are accumulated at the capillary fringe. A parallel application of both frequencies was demonstrated as the most suitable method to reduce temperature gradients. By using electronic filters, both electric fields can be established by only one electrode array. This innovative concept is especially applicable for optimizing thermal remediation of light non-aqueous phase liquid contaminations or realizing thermally-enhanced electrokinetic removal of heavy metals.
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