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http://dx.doi.org/10.7857/JSGE.2017.22.5.082

Changes in the Ecological Toxic Effects of the Contaminated Sediment of Singapore after Treatment  

Jho, Eun Hea (Department of Environmental Science, Hankuk University of Foreign Studies)
Yun, Seong Ho (Department of Environmental Science, Hankuk University of Foreign Studies)
Hwang, Sun Kyung (Department of Environmental Science, Hankuk University of Foreign Studies)
Lee, Sung Jong (Department of Environmental Science, Hankuk University of Foreign Studies)
Kim, Hongseok (Research & Development Division, Hyundai Engineering & Construction)
Chae, Heehun (Research & Development Division, Hyundai Engineering & Construction)
Publication Information
Journal of Soil and Groundwater Environment / v.22, no.5, 2017 , pp. 82-88 More about this Journal
Abstract
Contaminated sediment can be treated in order to reuse the treated sediment. Even though the chemical criteria are satisfied, the treated sediment could still impose toxic effects. Therefore, this study investigated the changes in the ecological toxic effects of the contaminated sediment from the J region in Singapore after treatment. The contaminated sediment was subject to sequential soil washing and thermal treatment, followed by pH neutralization. Toxic effects of the contaminated and treated sediments were determined by using Vibrio fischeri ($Microtox^{(R)}$), Triticum aestivum (wheat), and Eisenia foetida (earthworm). After treatment, the concentrations of total petroleum hydrocarbons and heavy metals were decreased by 98% and 59-93%, respectively, and satisfied the Industrial Maximum Values of the Dutch Standard, which were used as the remedial goal. The bioluminescence reduction of V. fischeri decreased significantly, and the earthworm survival increased from 0% to 90% after treatment. The germination rate increased from $0{\pm}0%$ to $75{\pm}13%$ after treatment, but the treated sediment may need additional treatment such as nutrient addition for better plant growth. Overall, this study showed that the treatment of the contaminated sediment satisfactorily removed mixed contaminants, and this led to reduction in toxic effects, suggesting improved potentials for reuse of the treated sediment.
Keywords
Sediment; Singapore; Toxicity; Remediation; Mixed contaminants;
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