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Lab-scale study on the application of In-Adit-Sulfate-Reducing System for AMD control
1Environmental Hazards Group, The Korea Institute of Geoscience and Mineral Resources (KIGAM), 30 Gajeong-dong, Yuseong-gu, Daejeon 305-350, Republic of Korea.
Journal of Hazardous Materials
|May 6, 2008
Summary
Passive acid mine drainage (AMD) treatment systems often struggle with sulfate reduction. An In-Adit-Sulfate-Reducing System (IASRS) shows promise for improved sulfate removal, though further optimization is needed.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Microbial Remediation
Background:
- Many passive systems for acid mine drainage (AMD) treatment exhibit performance issues, particularly in sulfate reduction.
- Existing systems demonstrate low efficiency for sulfate removal by Sulfate Reducing Bacteria (SRB), despite adequate metal removal and pH control.
Purpose of the Study:
- To evaluate the efficacy of an In-Adit-Sulfate-Reducing System (IASRS) for treating acid mine drainage.
- To compare the performance of IASRS models at different temperatures and organic carbon conditions.
Main Methods:
- Laboratory-scale experiments were conducted using two models of IASRS, operated at 15°C (Model 1) and 25°C (Model 2).
- Model 1 was initiated with half the chemical oxygen demand (COD) compared to Model 2.
- Performance was assessed based on metal removal ratios, pH control, and sulfate removal rates.
Main Results:
- Both IASRS models achieved high metal removal ratios exceeding 90%.
- Sulfate removal ratios were 23% for Model 1 and 27% for Model 2, which are low but higher than conventional systems.
- Performance was evaluated using synthetic AMD with low pH (2.8) and high sulfate concentration.
Conclusions:
- IASRS demonstrates potential for enhanced sulfate reduction in AMD treatment compared to existing passive systems.
- Optimizing COD levels and design modifications are presumed to further increase sulfate removal efficiency.
- IASRS offers a promising alternative for improving sulfate reduction in AMD passive treatment systems.
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