Electrokinetic remediation of contaminated soil with waste-lubricant oils and zinc

Title
Electrokinetic remediation of contaminated soil with waste-lubricant oils and zinc
Authors
박성우이재영양중석김경조백기태
Keywords
Catholyte purging; Mixed wastes; Railroad-contaminated soil; Total petroleum hydrocarbon
Issue Date
2009-09
Publisher
Journal of hazardous materials
Citation
VOL 169, NO 1-3, 1168-1172
Abstract
The feasibility of electrokinetic technology on the remediation of mixed-waste-contaminated railroad soil, contaminated by lubricant oil and zinc,was investigated. To enhance the removal efficiency, catholyte purging with 0.1MHNO3 and a supply of non-ionic surfactant, secondary alcohol ethoxylate,was applied to the anode to remove Zn and to solubilize the lubricant oil. The catholyte purging maintained the soil pH as acidic and enhanced desorption of zinc from the soil, where the zeta potential of the acidic soil became positive. Thereafter, the direction of electro-osmotic flow was changed from the cathode to anode and the flow rate was reduced. The lesser in magnitude reverse electro-osmotic flow inhibited the migration of zinc and the lubricant oil was removed by the electro-osmotic flow. The removal of zinc and lubricant oil was enhanced with an increase in voltage gradient; however, a higher voltage gradient resulted in higher energy expenditure. After electrokinetic operation over 17 days, the removal efficiency of zincwas 22.1–24.3%, and that of lubricant oilwas 45.1–55.0%. Although the removal of lubricant oilwas quite high, the residual concentration did not meet Korean regulation levels.
URI
http://pubs.kist.re.kr/handle/201004/36212
ISSN
0304-3894
Appears in Collections:
KIST Publication > Article
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