期刊
WATER RESEARCH
卷 36, 期 1, 页码 167-177出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(01)00238-X
关键词
acid mine drainage; heavy metals; sulfate reduction; reactive walls; stepwise regression; modeling
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 2000-3200 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 (R-2 = 0.86, F = 62.38 (p-level < 10(-13)) and R-2 = 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. (C) 2001 Elsevier Science Ltd. All rights reserved.
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