Abstract
The results of two pilot-scale experiments on enhanced electrokinetic extraction of lead from contaminated soil samples collected from a military Small Arms Training Facility are presented. The tests were conducted using two boxes with electrode spacing of 87 cm (Box 1) and 174 cm (Box 2). The soil was formed of a sandy layer on top of a clayey sand layer. The soil contained bullet fragments and the mean initial lead concentration in the minus 2.00 mm soil fraction was 3041 mg∕kg and 1187 mg∕kg in the sand and clayey sand layers, respectively. A current density of 1.3 A∕ m2 was used in both tests and was doubled after 112 days of processing. organic acid was used to maintain the catholyte pH between 4 and 5. Box 1 and Box 2 were processed for 9 months and 11 months, respectively. The results showed that organic acid amendment at the cathode reduced the voltage and energy requirement by 70% and enhanced lead extraction. Lead transport showed a delay of about 14 days in the initial transport front developme...
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