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Title: Water quality changes in acid mine drainage streams in Gangneung, Korea, 10 years after treatment with limestone

To determine the long-term effectiveness of the limestone treatment for acid mine drainage (AMD) in Gangneung, Korea, we investigated the elemental distribution in streams impacted by AMD and compared the results of previous studies before and approximately 10 years after the addition of limestone. Addition of limestone in 1999 leads to a pH increase in 2008, and with the exception of Ca, the elemental concentrations (e.g., Fe, Mn, Mg, Sr, Ni, Zn, S) in the streams decreased. The pH was 2.5–3 before the addition of limestone and remained stable at around 4.5–5 from 2008 to 2011, suggesting the reactivity of the added limestone was diminished and that an alternative approach is needed to increase the pH up to circumneutral range and maintain effective long-term treatment. To identify the processes causing the decrease in the elemental concentrations, we also examined the spatial (approximately 7 km) distribution over three different types of streams affected by the AMD. Lastly, the elemental distribution was mainly controlled by physicochemical processes including redox reactions, dilution on mixing, and co-precipitation/adsorption with Fe (hydr)oxides.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [4] ;  [1]
  1. Korea Inst. of Science and Technology, Gangneung (South Korea)
  2. Korea Inst. of Geoscience and Mineral Resources, Daejeon (South Korea)
  3. Yonsei Univ., Seoul (South Korea). Earth System Sciences
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Biosciences Division
Publication Date:
OSTI Identifier:
1246366
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Geochemical Exploration
Additional Journal Information:
Journal Volume: 159; Journal Issue: C; Journal ID: ISSN 0375-6742
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Korea Institute of Science and Technology (KIST); Korea Ministry of Environment; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES acid mine drainage; limestone treatment; metals; sulfate