Shim, Moo Joon Choi, Byoung Young Lee, Giehyeon Hwang, Yun Ho Yang, Jung-Seok O'Loughlin, Edward J. Kwon, Man Jae 2024-01-20T05:32:50Z 2024-01-20T05:32:50Z 2021-09-03 2015-12 0375-6742 https://pubs.kist.re.kr/handle/201004/124722 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. The elemental distribution was mainly controlled by physicochemical processes including redox reactions, dilution on mixing, and co-precipitation/adsorption with Fe (hydr)oxides. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV DUCKTOWN MINING DISTRICT HYDROGEOCHEMICAL CHARACTERISTICS PASSIVE TREATMENT DISSOLVED METALS IMGOK CREEK COAL-MINE IRON SEDIMENTS SULFATE ADSORPTION Water quality changes in acid mine drainage streams in Gangneung, Korea, 10 years after treatment with limestone Article 10.1016/j.gexplo.2015.09.015 1 JOURNAL OF GEOCHEMICAL EXPLORATION, v.159, pp.234 - 242 JOURNAL OF GEOCHEMICAL EXPLORATION 159 234 242 scie scopus 000364896600020 2-s2.0-84945971158 Geochemistry & Geophysics Geochemistry & Geophysics Article DUCKTOWN MINING DISTRICT HYDROGEOCHEMICAL CHARACTERISTICS PASSIVE TREATMENT DISSOLVED METALS IMGOK CREEK COAL-MINE IRON SEDIMENTS SULFATE ADSORPTION Acid mine drainage Metals Sulfate Limestone treatment