Abstract
Pilot-scale experiments were performed to investigate the role of equalization basins used with constructed wetland systems for treatment of flue gas desulfurization (FGD) waters. Analysis of FGD water samples indicated that aqueous concentrations of Hg, As, and Se remained constant or changed very slightly in a pilot-scale equalization basin during a 24-h hydraulic retention time (HRT). No change in toxicity of FGD water occurred after one HRT. FGD particles were predominantly silt size, and approximately 99% of particles suspended in FGD water settled to the bottom of a 2.5-m-deep equalization basin during the first 4 h of the 24-h HRT. Approximately 90% of the total As, and smaller percentages of Hg and Se, in FGD water and particles were removed by particle settling in the equalization basin. Results of this investigation lend support to the use of equalization basins for treating FGD waters in constructed wetland treatment systems.
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Acknowledgments
Funding for this research was provided by the US Department of Energy through the University Coal Research Program, contract DE-FG26-05NT42535. The authors would like to thank ENTRIX, Dr. D. Bruce, and Dr. W. Chao (both of Clemson University) for their involvement with the project. We acknowledge the helpful and insightful comments of two anonymous reviewers.
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Iannacone, M.M., Castle, J.W. & Rodgers, J.H. Role of Equalization Basins of Constructed Wetland Systems for Treatment of Particulate-Associated Elements in Flue Gas Desulfurization Waters. Water Air Soil Pollut 203, 123–137 (2009). https://doi.org/10.1007/s11270-009-9996-9
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DOI: https://doi.org/10.1007/s11270-009-9996-9