Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Stabilization of Arsenic in Soil around the Abandoned Coal-Mine Using Mine Sludge Pellets

광산슬러지 펠렛을 이용한 폐석탄광 주변 토양 내 비소 안정화 연구

  • Ko, Myoung-Soo (Department of Energy and Resources Engineering, Kangwon National University) ;
  • Ji, Won-Hyun (Institute of Mine Reclamation Technology, Mine Reclamation Corporation (MIRECO)) ;
  • Kim, Young-Gwang (School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Park, Hyun-Sung (Institute of Mine Reclamation Technology, Mine Reclamation Corporation (MIRECO))
  • 고명수 (강원대학교 에너지자원.산업공학부) ;
  • 지원현 (한국광해관리공단 기술연구소) ;
  • 김영광 (광주과학기술원 지구환경공학부) ;
  • 박현성 (한국광해관리공단 기술연구소)
  • Received : 2018.11.27
  • Accepted : 2018.12.24
  • Published : 2019.02.28
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Abstract

The purpose of this study was to assess the applicability of acid mine drainage sludge (AMDS) pellets for the arsenic (As) stabilization and to suggest an evaluation method for arsenic stabilization efficiency in soil around abandoned coal mines. The soil samples were collected from the agricultural field around Ham-Tae, Dong-Won, Dong-Hae, and Ok-Dong coal mine. The As concentration in soil was exceeding the criteria of soil pollution level, except for Ham-Tae coal mine. The AMDS pellets are more appropriate to use by reducing dust occurrence during the transport and application process than AMDS powder. In addition, AMDS pellets were maintained the As stabilization efficiency. The application of AMDS pellets for the As stabilization in soil was assessed by column experiments. The AMDS pellets were more effective than limestone and steel slag, which used as the conventional additives for the stabilization process. The As extraction by $0.43M\;HNO_3$ or $1M\;NaH_2PO_4$ solution were appropriate evaluation methods for evaluation of As stabilization efficiency in the soil.

이 연구는 폐석탄광 주변 토양을 대상으로 토양 내 비소 안정화를 위한 광산슬러지 펠렛의 적용성을 확인하고 효과적인 안정화 효율평가 방법을 제시하고자 하였다. 함태, 동원, 동해, 옥동탄광 주변 경작지에서 토양을 채취하여 비소 농도를 확인한 결과 함태탄광을 제외한 나머지 폐석탄광 주변 토양에서 토양오염우려기준을 초과하는 비소농도를 보였다. 광산슬러지 펠렛은 미강과 광산슬러지를 혼합하여 제조하다. 분말형태의 광산슬러지에 비해 광산슬러지 펠렛은 운반과 안정화 시공과정에서 분진의 발생이 발생하지 않아 적용성이 높고 광산슬러지가 갖는 비소 안정화 효율을 유지하고 있는 것으로 나타났다. 칼럼실험을 통해 폐석탄광 주변 토양 내 비소 안정화에 광산슬러지 펠렛의 활용 가능성을 평가한 결과 기존의 토양 안정화제로 주로 사용한 석회석과 제강슬래그 보다 더 효과적인 것으로 나타났으며, 토양 내 비소 안정화 효율 평가방법으로는 $0.43M\;HNO_3$또는 $1M\;NaH_2PO_4$용액을 이용한 용출법이 적합한 것으로 나타났다.

Keywords

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Fig. 1. As concentration in soil by aqua-regia digestion and sequential extraction. (a) Ham-Tae mine, (b) Dong-Won mine,(c) Dong-Hae mine, (d) Ok-Dong mine.

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Fig. 3. Arsenic concentrations in leachate from soil column (a) Dong-Won mine, (b) Dong-Hae mine.

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Fig. 4. Variation of (a) As, (b) pH, and (c) EC in leachate from As stabilization in soil column.

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Fig. 2. (a) Acid mine drainage sludge (AMDS) pellet and (b) As removal ratio by AMDS pellet, limestone and steel slag.

Table 1. Sequential extraction process for As in soil

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Table 2. Evaluation method for arsenic stabilization efficiency in soil

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