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Disposal of heavy metal‐contaminated sediment from Ulsan Bay, South Korea: treatment processes and legal framework
Author(s) -
Oh SeokYoung,
Cha SooWon,
Kim IckHyun,
Lee HyunWoo,
Kang SeungGoo,
Choi SolJi
Publication year - 2011
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2010.00231.x
Subject(s) - sediment , dispose pattern , leaching (pedology) , contamination , reagent , hazardous waste , environmental science , bay , extraction (chemistry) , environmental chemistry , soil contamination , waste management , environmental engineering , soil water , chemistry , geology , soil science , engineering , paleontology , ecology , oceanography , chromatography , biology
The effectiveness of two different management schemes to dispose of heavy metal‐contaminated sediments from Ulsan Bay, South Korea, soil washing and solidification/stabilization, were evaluated through a series of analyses. NaOH proved to be an effective washing reagent for As, extracting 75% of the As in sediment samples. EDTA was found to significantly enhance the extraction of Cu, Pb and Zn. However, complete removal of any metals was not achieved even after application of 100 mM concentrations of washing reagents. Therefore, a solidification/stabilization technique was applied to dredged sediment samples using ordinary Portland cement (1–40%) and fly ash (∼20%). Solidified sediments did not release meaningful amount of the metals via leaching tests. Our results suggest that solidification/stabilization is a better option for effective disposal of heavy metal‐contaminated sediments than soil washing. A legal framework for the treatment of hazardous wastes and contaminated soils in Korea is discussed.