Multiple factor design for reactive mixture selection for use in reactive walls in mine drainage treatment.
Sulfate-reducing reactive walls installed in situ in the path of acid mine drainage contaminated groundwater, present a promising passive treatment technology. However, a rigorous and methodical selection of the most appropriate reactive mixture composition still needs to be investigated. The aim of this study was the selection of the most reactive medium using a multiple factor design and the modeling of the sulfate-reduction rate. Reactivity of 17 mixtures was assessed in batch reactors (in duplicates) using a synthetic AMD. Results indicate that within 41 days, sulfate concentrations decreased from initial concentrations of 2,000-3,200 mg/l to final concentrations of <90 mg/l. Metal removal efficiencies ranged between 51-84% for Ni and 73-93% for Zn. Generated sulfate-reduction rate predictive models which had very satisfactory parameters (R2 = 0.86, F = 62.38 (p-level < 10(-13)) and R2 = 0.90. F = 62.30 (p-level < 10(-13))) identified poultry manure and two other carbon sources as the critical variables for sulfate-reduction rate.
Cocos
Ioana A
IA
Ecole Polytechnique de Montréal, Québec, Canada.
Zagury
Gerald J
GJ
Clément
Bernard
B
Samson
Réjean
R
D000818:Animals; D002244:Carbon / Q000737:chemistry; D005160:Facility Design and Construction; D005544:Forecasting; D006863:Hydrogen-Ion Concentration; D008372:Manure; D019216:Metals, Heavy; D008906:Mining; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D011200:Poultry; D012989:Soil Pollutants / Q000032:analysis*; D013431:Sulfates / Q000737:chemistry*; D014876:Water Pollution / Q000517:prevention & control*
D008372:Manure; D019216:Metals, Heavy; D012989:Soil Pollutants; D013431:Sulfates; D002244:Carbon