Abstract
The Anna S coal mine complex in Tioga County, PA, produces drainage with a pH of 2.8–3.6 containing 3–36 mg/L Al, 1–36 mg/L Fe, and 6–9 mg/L Mn. In 2003, the Babb Creek Watershed Association installed two systems that passively treat three discharges from the mine complex. Both systems contain four parallel vertical flow ponds followed by aerobic wetlands. The vertical flow ponds contain a total of 35,483 t of limestone and 4,913 m3 of organic substrate. During the last 6 years, the systems have treated an average of 1,971 L/min of flow to neutral pH with 135–146 mg/L of alkalinity (as CaCO3), with less than 1 mg/L of Al and Fe, and 2–4 mg/L of Mn. The vertical flow ponds have generated alkalinity at rates of 32–53 g/m2/day as CaCO3. No seasonal variation in treatment effectiveness has been observed, despite relatively harsh winter seasons. The total cost of the passive systems was $2.5 million (US). The 20 year projected unit treatment cost, including periodic replacement of the organic substrate, is $403–618 per t (as CaCO3) of net alkalinity generated.
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Acknowledgments
The Anna S Mine Passive Treatment Complex was designed and constructed with funding provided by the Pennsylvania Department of Environmental Resources Growing Greener Program, the US Office of Surface Mining Clean Streams Initiative, the Foundation for Pennsylvania Watersheds, and the Babb Creek Watershed Association.
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Hedin, R., Weaver, T., Wolfe, N. et al. Passive Treatment of Acidic Coal Mine Drainage: The Anna S Mine Passive Treatment Complex. Mine Water Environ 29, 165–175 (2010). https://doi.org/10.1007/s10230-010-0117-1
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DOI: https://doi.org/10.1007/s10230-010-0117-1