Laboratory pre-assays for soil remediation by electro synthesis of oxidants and their electrokinetic distribution.
The feasibility of an innovative electrokinetic soil remediation technique for an in situ application against fuel-contaminated soil has been studied in this work. This technique combines the anodic production of oxidizing agents on boron-doped diamond (BDD) electrode surfaces with their electrokinetic distribution in soil. In this study, the production of oxidizing agents, i.e., hydroxyl radicals (OH degrees ) and peroxodisulfate (S(2)O(8)(2 -)), from a 0.85 M sodium sulfate electrolyte with mechanically implanted BDD anodes at room temperature has been investigated. It was found that about 12 mmol/L of oxidants could be produced after 10 Ah/L with a current density of 200 mA/cm(2). For investigating the transport velocity of peroxodisulfate in soil a vertical column system has been created. Experimental results show linear velocity behaviour for the oxidants' migration in 100% sand soil reaching up to 2 cm/h at an electrical gradient of 4 V/cm. As for different soil textures which have been tested, the assays stated that the highest velocity can be achieved in a 100% silt soil with 3.3 cm/h.
Institute of Sustainable Waste Management and Technology, University of Leoben, Leoben, Austria.
Heidi
H
Mikkola
Julia Y
JY
Schmale
Wolfgang
W
Wesner
Slagjana
S
Petkovska
D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D052918:Environmental Restoration and Remediation; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D012989:Soil Pollutants / Q000737:chemistry*
D016877:Oxidants; D012989:Soil Pollutants