This study investigated both leaching of heavy metals and ecological toxicity when coal bottom ash (CBA) generated by power plants has been used to reduce both erosion and turbidity of surface runoff at construction sites. The Korean leaching test (KLT) method, sequential extraction method, and acute toxicity test using Daphnia magna were performed to evaluate the environmental impacts and the ecological risks of CBA. According to the results of the KLT method of CBA, trace amounts of Cu were leached at limit of quantitation whereas metal leaching was not monitored for other heavy metals. Through the sequential extraction method of CBA, the relatively high leaching potential was found for As and Pb due to greater fraction of exchangeable (F1) and bound to carbonates (F2), and reasonable probability of leaching under the reducing/anaerobic environment was expected for Cu due to high faction of bound to Fe?Mn oxides (F3). However, significantly low probability of leaching was expected for Cd, Cr, Ni, and Zn with grater fractions of bound to organic matter (F4) and residual (F5). Additionally, total amount of heavy metals in CBA was lower than criteria for soil pollution concerns, and were similar or slightly lower levels than the ‘15 National soil average concentration excluding Cr6+. Finally, acute toxicity test using Daphnia magna display no impact for mobilization and lethality in either the prefiltration or post-filtration experiment, indicating that the ecological toxicity was insignificant with zero values of toxic unit. Consequently, no environmental impacts or ecological toxicity are expected when CBA generated by power plants has been used to reduce both erosion and turbidity of surface runoff at construction sites.

Abstract
 I. 서 론
 II. 연구방법
  1. 시험 재료
  2. 석탄저회의 표면 특성 분석
  3. 폐기물용출실험(Korean Leaching Test, KLT)
  4. 연속추출시험(Sequential Extraction Procedure)
  5. 물벼룩을 활용한 급성독성평가
 III. 결과 및 고찰
  1. 석탄저회의 표면 특성 분석
  2. 폐기물용출실험결과(Results of Korean LeachingTest)
  3. 연속추출시험(Result of Sequential ExtractionProcedure)
  4. 물벼룩을 활용한 급성독성평가
 IV. 결 론
 References

• 김진호(한밭대학교 건설환경공학과) | Jinho Kim (Department of Civil and Environmental Engineering, Hanbat National University)
• 주진철(한밭대학교 건설환경공학과) | Jin Chul Joo (Department of Civil and Environmental Engineering, Hanbat National University) Corresponding author
• 강은비(한밭대학교 건설환경공학과) | Eunbi Kang (Department of Civil and Environmental Engineering, Hanbat National University)
• 최종수(LH토지주택연구원) | Jongsoo Choi (Land & Housing Institute)
• 이정민(LH토지주택연구원) | Jeongmin Lee (Land & Housing Institute)
• 김용혁(한국남동발전) | Yonghyok Kim (Korea South-East Power Co.)