Treating coal mine drainage with an artificial wetland

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0.22-ha constructed wetland dominated by Typha latifolia was evaluated for its ability to treat approximately 340 L/min of coal mine drainage from an underground seep in eastern Ohio. Loading of mine drainage to the wetland ranged from 1 5 to 35 cm/d. Conductivity, pH, manganese, and sulfate were little changed by the wetland. Iron decreased by 50 to 60%, with slightly higher decreases during the growing season. Com- parisons are made to a volunteer Typha marsh receiving mine drainage where iron was found to decrease by approximately 89%. Design considerations of loading rates of created wetlands suggest that improved treatment of mine drainage is correlated with longer retention times and lower iron loading rates. Preliminary design criteria for construction of these types of Typha wetlands for re- moval of iron are suggested as 5 cm/d hydrologie loading and 2 to 40 g Fe/m2 • d for iron loading, depending on the treatment desired


Journal of the Water Pollution Control Federatio



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