Abstract
Performance data was previously collected from steel slag leach beds (SLBs) being used to treat AMD in southeastern Ohio. During initial analysis of the SLB performance, it was postulated that CO2 geochemistry significantly affected the performance through precipitation of carbonate minerals in the flow paths of the SLB. To verify this postulation, we conducted a further investigation of the CO2 geochemistry in the SLBs, including extended geochemical analyses and additional X-ray diffractometer analyses. Since the primary geochemical reaction of CO2 in SLBs is mineral carbonation with calcium, a simple model was used to calculate the Ca dissolution potentials in the SLBs. The molar values for Ca dissolution potential were then used along with each SLB’s influent chemical concentrations in PHREEQC geochemical analyses to verify effluent concentrations and calcite precipitation. Results showed good agreement between the modeled effluent concentrations and the actual data, indicating that this approach can be used to estimate calcite precipitation within SLB systems.
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