Journal article
Sequential hydrotalcite precipitation and biological sulfate reduction for acid mine drainage treatment
Chemosphere, Vol.252
2020
Abstract
Hydrotalcite precipitation is a promising technology for the on-site treatment of acid mine drainage (AMD). This technology is underpinned by the synthesis of hydrotalcite that can effectively remove various contaminants. However, hydrotalcite precipitation has only limited capacity to facilitate sulfate removal from AMD. Therefore, the feasibility of coupling biological sulfate reduction with the hydrotalcite precipitation to maximize sulfate removal was evaluated in this study. AMD emanating from a gold mine (pH 4.3, sulfate 2000 mg L−1, with various metals including Al, Cd, Co, Cu, Fe, Mn, Ni, Zn) was first treated using the hydrotalcite precipitation. Subsequently, biological treatment of the post-hydrotalcite precipitation effluent was conducted in an ethanol-fed fluidized bed reactor (FBR) at a hydraulic retention time (HRT) of 0.8–1.6 day. The hydrotalcite precipitation readily neutralized the acidity of AMD and removed 10% of sulfate and over 99% of Al, Cd, Co, Cu, Fe, Mn, Ni, Zn. The overall sulfate removal increased to 73% with subsequent FBR treatment. Based on 454 pyrosequencing of 16S rRNA genes, the identified genera of sulfate-reducing bacteria (SRB) included Desulfovibrio, Desulfomicrobium and Desulfococcus. This study showed that sulfate-rich AMD can be effectively treated by integrating hydrotalcite precipitation and a biological sulfate reducing FBR.
Details
- Title
- Sequential hydrotalcite precipitation and biological sulfate reduction for acid mine drainage treatment
- Authors/Creators
- S. Yan (Author/Creator) - CSIRO Land and WaterK.Y. Cheng (Author/Creator)C. Morris (Author/Creator) - CSIRO Land and WaterG. Douglas (Author/Creator) - CSIRO Land and WaterM.P. Ginige (Author/Creator) - CSIRO Land and WaterG. Zheng (Author/Creator) - Nanjing Agricultural UniversityL. Zhou (Author/Creator) - Nanjing Agricultural UniversityA.H. Kaksonen (Author/Creator) - CSIRO Land and Water
- Publication Details
- Chemosphere, Vol.252
- Publisher
- Elsevier Ltd
- Identifiers
- 991005546019607891
- Copyright
- © 2020 Elsevier Ltd.
- Murdoch Affiliation
- School of Engineering and Information Technology
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 7 Engineering & Materials Science
- 7.229 Mineral & Metal Processing
- 7.229.774 Bioleaching
- Web Of Science research areas
- Environmental Sciences
- ESI research areas
- Environment/Ecology