• Toxicity Assessment of Pb or Cd Contaminated Sediments Amended with Birnessite or Hydroxyapatite
  • Lee, Seung-Bae;Jung, Jae-Woong;Kim, Young-Jin;Nam, Kyoung-Phile;
  • Department of Civil and Environmental Engineering, Seoul National University;Department of Civil and Environmental Engineering, Seoul National University;Water & Env. Team, Civil ENV. Center, Samsung C&T Corporation;Department of Civil and Environmental Engineering, Seoul National University;
  • Birnessite와 Hydroxyapatite에 의한 납과 카드뮴 오염퇴적토의 독성저감 평가
  • 이승배;정재웅;김영진;남경필;
  • 서울대학교 건설환경공학부;서울대학교 건설환경공학부;삼성물산주식회사 토목엔지니어링센터 물/환경팀;서울대학교 건설환경공학부;
Abstract
The success of stabilization treatment in heavy metal contaminated sediment depends on the heavy metal bioavailability reduction through the sequestration of the heavy metals. This study was performed to assess the changes in the bioavailability of Pb or Cd in the Pb or Cd contaminated sediments by using birnessite and hydroxyapatite as stabilizing agents. The toxicity tests were carried out using a microorganism (Vibrio fischeri), an amphipod (Hyalella azteca) and an earthworm (Eisenia foetida). With Vibrio fischeri, the toxicities of both Pb and Cd were reduced by more than ten times in the presence of birnessite and hydroxyapatite compared to that of in the absence of birnessite and hydroxyapatite. The concentrations of Pb and Cd in the contaminated sediments were lethal to Hyalella azteca, however, in the presence of birnessite and hydroxyapatite more than 90%, on average, of Hyalella azteca survived. With Eisenia foetida, the bioaccumulated concentrations of both Pb and Cd were reduced by more than 75%, on average, lower with the addition of birnessite and hydroxyapatite to the contaminated sediments. These results show that the addition of birnessite and hydroxyapatite can reduce the bioavailability of Pb and Cd in contaminated sediments. In addition, the in situ and ex situ performance of birnessite and hydroxyapatite as stabilizing agents can be verified using the toxicity tests with Hyalella azteca and Eisenia foetida, respectively.

Keywords: Heavy metal contaminated sediment;Stabilization;Bioavailability;Birnessite;Hydroxyapatite;

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This Article

  • 2012; 17(4): 1-8

    Published on Aug 31, 2012

  • 10.7857/JSGE.2012.17.4.001
  • Received on Apr 7, 2011
  • Revised on Jun 20, 2012
  • Accepted on Jun 20, 2012