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Iron Removal by a Passive System Treating Alkaline Coal Mine Drainage

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Abstract

The Marchand passive treatment system was constructed in 2006 for a 6,000 L/min discharge from an abandoned underground bituminous coal mine located in western Pennsylvania, USA. The system consists of six serially connected ponds followed by a large constructed wetland. Treatment performance was monitored between December 2006 and 2007. The system inflow was alkaline with pH 6.2, 337 mg/L CaCO3 alkalinity, 74 mg/L Fe, 1 mg/L Mn, and <1 mg/L Al. The final discharge averaged pH 7.5, 214 mg/L CaCO3 alkalinity, and 0.8 mg/L Fe. The settling ponds removed 84% of the Fe at an average rate of 26 g Fe m−2 day−1. The constructed wetland removed residual Fe at a rate of 4 g Fe m−2 day−1. Analyses of dissolved and particulate Fe fractions indicated that Fe removal was limited in the ponds by the rate of iron oxidation and in the wetland by the rate of particulate iron settling. The treatment effectiveness of the system did not substantially degrade during cold weather or at high flows. The system cost $1.3 million (2006) or $207 (US) per L/min of average flow. Annual maintenance and sampling costs are projected at $10,000 per year. The 25-year present value cost estimate (4% discount rate) is $1.45 million or $0.018 per 1,000 L of treated flow.

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Acknowledgments

Funding for the Marchand system’s design, permitting and construction was provided by the Pennsylvania Department of Environmental Protection Growing Greener Program. Ted Weaver conducted mine pool and soils investigations and managed early construction activities. Kim Weaver designed the system and prepared the permit applications. Darl Dodson was the Sewickley Creek Watershed Association’s project manager. J. Jack provided construction oversight. David Larson, Ben Hedin, and Dan Compton assisted with water sampling. Thanks to the Rich Beam at the PA Bureau of Abandoned Mine Reclamation and to Bruce Golden at the Western PA Coalition for Abandoned Mine Reclamation for providing laboratory analyses.

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Correspondence to Robert S. Hedin.

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Hedin, R.S. Iron Removal by a Passive System Treating Alkaline Coal Mine Drainage. Mine Water Environ 27, 200–209 (2008). https://doi.org/10.1007/s10230-008-0041-9

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