Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Influence of Bacterial Attachment on Arsenic Bioleaching from Mine Tailings: Dependency on the Ratio of Bacteria-Solid Substrate

광물찌꺼기 내 비소의 미생물 침출 시 박테리아 흡착 영향: 박테리아와 고체 기질 비율에 관한 연구

  • Park, Jeonghyun (Department of Mineral Resources and Energy Engineering, Jeonbuk National University) ;
  • Silva, Rene A. (Department of Mineral Resources and Energy Engineering, Jeonbuk National University) ;
  • Choi, Sowon (Department of Environment and Energy, Jeonbuk National University) ;
  • Ilyas, Sadia (Department of Mineral Resources and Energy Engineering, Jeonbuk National University) ;
  • Kim, Hyunjung (Department of Mineral Resources and Energy Engineering, Jeonbuk National University)
  • 박정현 (전북대학교 자원.에너지공학과) ;
  • ;
  • 최소원 (전북대학교 환경에너지융합학과) ;
  • ;
  • 김현중 (전북대학교 자원.에너지공학과)
  • Received : 2020.12.21
  • Accepted : 2021.04.26
  • Published : 2021.06.30
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Abstract

The present study investigates the bioleaching efficiencies of arsenic via contact and non-contact mechanisms. The attachment of Acidithiobacillus ferrooxidans was restricted by a partition system comprising a semi-permeable membrane with a molecular weight cutoff of 12-14 kDa. The results were compared for two arsenic concentrations in the system (1.0% and 0.5% w/v) to maintain a homogeneous system. The overall bacterial performance was monitored by comparing total arsenic and iron concentrations, Fe ion speciation, pH, and solution redox potentials in flask bioleaching experiments over a period of 10 d. Our results indicated that bacterial attachment could increase arsenic extraction efficiency from 20.0% to 44.9% at 1.0 % solid concentrations. These findings suggest that the bacterial contact mechanism greatly influences arsenic bioleaching from mine tailings. Therefore, systems involving two-step or non-contact bioleaching are less effective than those involving one-step or contact bioleaching for the efficient extraction of arsenic from mine tailings.

본 연구는 미생물의 접촉 및 비접촉 매커니즘에 따른 비소의 미생물 침출 효율을 보여준다. 12-14 kDa의 반투과성막으로 구성된 분리시스템에서 Acidithiobacillus ferroxidans와 광물찌꺼기의 흡착을 제어하며 접촉 및 비접촉 시스템을 구분하였으며 1.0% 및 0.5% w/v의 두 가지 광액 농도에서 침출효율을 비교하였다. 회분식 미생물 침출 실험을 10일간 수행하면서 비소와 철의 총 농도, 철 이온종 변화, pH, 산화환원전위를 비교하며 박테리아 활동을 확인하였다. 높은 광액 농도인 1.0%에서 박테리아의 흡착에 의해 비소 침출 효율이 20.0%에서 44.9%로 증가하였다. 이러한 결과는 박테리아의 접촉 메커니즘이 광물찌꺼기 내 비소 침출에 큰 영향을 준다는 것을 보여준다. 따라서, 광물찌꺼기 내 비소 제거는 2단계 또는 비접촉 미생물 침출 방법이 1단계 또는 접촉 미생물 침출 방법보다 효율적이지 않다는 것을 보여주었다.

Keywords

Acknowledgement

This research was supported by the Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (grant number : 2019H1D3A2A02101993).

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