Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Screening-Level Ecological Risk Assessment for Beneficial Reuse as Soil of Dredged Sediment Contaminated with Heavy Metals

중금속 오염 준설토의 토양으로서의 유효활용을 위한 선별수준 생태위해도평가

  • Kim, Moonkyung (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Kim, Kibeum (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Choi, Yongju (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Nam, Kyoungphile (Department of Civil and Environmental Engineering, Seoul National University)
  • 김문경 (서울대학교 건설환경공학부) ;
  • 김기범 (서울대학교 건설환경공학부) ;
  • 최용주 (서울대학교 건설환경공학부) ;
  • 남경필 (서울대학교 건설환경공학부)
  • Received : 2015.11.16
  • Accepted : 2016.03.31
  • Published : 2016.05.31
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Abstract

This study conducted a screening-level ecological risk assessment for heavy metals in dredged sediment for recycling in terrestrial environment. Toxicological information of six heavy metals (i.e., Cu, Zn, Cd, Pb, Cr, and Ni) was collected from ECOTOX of US Environmental Protection Agency, and screened and qualified for the use in the screening-level ecological risk assessment. According to the number of terrestrial ecological receptors for which toxicological information is available, PNEC (Predicted No Effect Concentration) of each heavy metal was derived using either stochastic approach (for Cu, Zn, and Cd), or deterministic approach (for Pb, Cr, and Ni). Hazard quotients of the six heavy metals were derived for a field-collected dredged sediment using the PNEC derived and the PEC (Predicted Environmental Concentration) determined for the dredged sediment. The HQs of Cu, Zn, Cr, Pb and Ni were higher than unity indicating a possibility of ecological risk of the five heavy metals when the dredged sediment is applied in terrestrial environment. Accordingly, remediation processes or a higher-level ecological risk assessment would be needed for the recycling of the material.

본 연구에서는 중금속의 생태독성자료를 통해 준설토의 육상 재활용을 위한 screening-level 생태위해도 평가를 수행하였다. 대상 중금속 6종(Cu, Zn, Cd, Pb, Cr, Ni)의 독성자료는 USEPA의 ECOTOX를 통해 수집하였으며, 선별과정을 거쳐 생태위해도 평가에 사용하였다. 각 중금속의 예측무영향농도는 독성자료의 획득이 가능한 육상 수용체의 종 수에 따라 확률론적 방법(Cu, Zn, Cd)과 결정론적 방법(Pb, Cr, Ni)을 통해 도출하였다. 현장 채취 준설토에서 발견되는 중금속 실제오염농도와 예측무영향농도와의 비교를 통해 생태위해도를 계산하였으며 Cu, Zn, Cr, Pb, Ni의 위해도가 1을 초과하여 생태독성학적 위해도가 존재할 수 있는 가능성을 확인하였다. 따라서 재활용 부지의 생태위해도를 고려하였을 때 해당 중금속 오염 준설토를 활용하기 위해서는 중금속 정화 또는 보다 높은 수준의 생태 위해도평가가 선행되어야 할 것으로 판단된다.

Keywords

References

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  1. Decision Making Framework for Beneficial use of Dredged Sediment in the Terrestrial Environment based on Environmental Risk Assessment and Sediment Characterization vol.40, pp.6, 2018, https://doi.org/10.4491/KSEE.2018.40.6.227