Influence of Bacterial Attachment on Arsenic Bioleaching from Mine Tailings: Dependency on the Ratio of Bacteria-Solid Substrate

Jeonghyun Park; A. Silva Rene; Sowon Choi; Ilyas Sadia; Hyunjung Kim

doi:10.7844/kirr.2021.30.3.30

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2021 Vol.30, Issue 3 Preview Page Next Page

Research Paper

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

30 June 2021. pp. 30-40

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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.

Keywords

Bioleaching

arsenic removal

Acidithiobacillus ferrooxidans

solid concentration

bacterial attachment

본 연구는 미생물의 접촉 및 비접촉 매커니즘에 따른 비소의 미생물 침출 효율을 보여준다. 12-14 kDa의 반투과성막으로 구성된 분리 시스템에서 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.

키워드

미생물 침출

비소 제거

Acidithiobacillus ferroxidans

광액농도

박테리아 흡착

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 30
No :3
Pages :30-40
Received Date : 2020-12-21
Revised Date : 2021-02-22; 2021-04-19
Accepted Date : 2021-04-26
DOI :https://doi.org/10.7844/kirr.2021.30.3.30

Resources RecyclingISSN:2765-3439(Print) 2765-3447(Online)한국자원리싸이클링학회

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