한국폐기물자원순환학회지 제35권 제6호 (p.561-570)

|Original Paper|
건설현장 탁수제어를 위한 재활용 석탄저회의 중금속 용출특성 및 생태독성평가

Assesment of Heavy Metal Leaching and Ecological Toxicity of Reused Coal Bottom Ash for Construction Site Runoff Control
키워드 :
Coal bottom ash,CBA,Construction sites,Ecological toxicity,Environmental impacts,Korean leaching test,KLT,Sequential extraction method

목차

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

초록

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.