Environmental Studies and Forestry

Understanding the biogeochemical mechanisms of metal removal from acid mine drainage with a subsurface limestone bed at the Motokura Mine, Japan

S. Fuchida, K. Suzuki, et al.

Discover how subsurface limestone beds (SLBs) could revolutionize the removal of toxic metals from acid mine drainage at the Motokura Mine in Japan. This exciting research, conducted by Shigeshi Fuchida, Kohei Suzuki, Tatsuya Kato, Masakazu Kadokura, and Chiharu Tokoro, reveals unique metal precipitation mechanisms that enhance SLB performance through biological agents.

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Abstract

Subsurface limestone beds (SLBs) are passive treatment systems for removing toxic metals from acid mine drainage (AMD). This study investigated metal precipitation mechanisms in an SLB at the Motokura Mine, Japan. Field surveys showed pH increasing to ~8, causing hydroxide/carbonate precipitation of Cu, Zn, and Pb. Mn and Cd removal occurred at lower pH (7–8) due to δ-MnO₂ formation by manganese-oxidizing bacteria, followed by Cd surface complexation with MnO₂. Biological agents enhanced metal removal, suggesting their utilization could improve SLB performance.

Publisher

Scientific Reports

Published On

Dec 01, 2020

Authors

Shigeshi Fuchida, Kohei Suzuki, Tatsuya Kato, Masakazu Kadokura, Chiharu Tokoro

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