Abstract
Four volumes of spent mushroom compost were exposed to synthetic coal mine drainage (pH 3.5, 48 mg L−1 Fe, 22 mg L−1 Mn) under oxidizing conditions (Eh 300 to 400 mV) at a relatively high rate of flow. After 15 days, the compost lost its ability to elevate pH, to lower the redox potential, to lower outlet iron concentrations, and to lower manganese concentrations, with larger volumes retaining more Fe and H+, but less Mn. Estimated retention maxima per liter of spent mushroom compost were 281 μeq H+, 5.56 g Fe, and 0.15 g Mn. These values are similar to those reported elsewhere for peat. The ‘saturated’ compost was then mixed and exposed to mine water in order to eliminate ‘dead zones’ in the compost. Subsequently, the compost was re-exposed to synthetic mine water (pH 4.0, 60 mg L−1 Fe, O mg L−1 Mn) under a much lower flow rate and less oxidizing regime for a period of 114 days. Under the low flow regime, iron was first exported from the compost as reducing conditions were established, and then retained on a stable basis. In addition, Eh was lowered and pH was elevated by the compost. On a net basis, the capacity of the compost to retain iron was increased and apparently stable under the decreased flow conditions.
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Stark, L.R., Wenerick, W.R., Williams, F.M. et al. Restoring the capacity of spent mushroom compost to treat coal mine drainage by reducing the inflow rate: A microcosm experiment. Water Air Soil Pollut 75, 405–420 (1994). https://doi.org/10.1007/BF00482949
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DOI: https://doi.org/10.1007/BF00482949