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Emerick, J. C., Wildeman, T. R., Cohen, R. R., & Klusman, R. W. (1994). Constructed wetland treatment of acid mine discharge at Idaho Springs, Colorado Guidebook on the geology, history, and surface-water contamination and remediation in the area from Denver to Idaho Springs, Colorado (R. C. Severson, Ed.) (Vol. C 1097).
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Evangelou, V. P. (1994). Potential microencapsulation of pyrite by artificial inducement of FePO (sub 4) coatings. In Special Publication – United States. Bureau of Mines, Report: BUMINES-SP-06B-94 (pp. 96–103). Proceedings of the International land reclamation and mine drainage conference and Third international conference on The abatement of acidic drainage; Volume 2 of 4; Mine drainage.
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Fyson, A., Nixdorf, B., & Steinberg, C. E. W. (1998). Manipulation of the sediment-water interface of extremely acidic mining lakes with potatoes; laboratory studies with intact sediment cores Geochemical and microbial processes in sediments and at the sediment-water interface of acidic mining lakes. In S. Peiffer (Ed.), Water, Air and Soil Pollution (pp. 353–363). 108.
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Isaacson, A. E., & Jeffers, T. H. (1995). Acid mine drainage remediation through applied water treatment systems Pollution prevention for process engineering. In P. E. Richardson, B. J. Scheiner, & Jr. F. Lanzetta (Eds.),. New York: Engineering Foundation.
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Kepler, D. A., & Mc Cleary, E. C. (1994). Successive Alkalinity-Producing Systems (SAPS) for the Treatment of Acid Mine Drainage. Proceedings, International Land Reclamation and Mine Drainage Conference, 1, 195–204.
Abstract: Constructed wetland treatment system effectiveness has been limited by the alkalinity-producing, or acidity-neutralizing, capabilities of systems. Anoxic limestone drains (ALD's) have allowed for the treatment of approximately 300 mg/L net acidic mine drainage, but current design guidance precludes using successive ALD's to generate alkalinity in excess of 300 mg/L because of concerns with dissolved oxygen. “Compost” wetlands designed to promote bacterially mediated sulfate reduction are suggested as a means of generating alkalinity required in excess of that produced by ALD's. Compost wetlands create two basic needs of sulfate reducing bacteria; anoxic conditions resulting from the inherent oxygen demand of the organic substrate, and quasi-circumneutral pH values resulting from the dissolution of the carbonate fraction of the compost. However, sulfate reduction treatment area needs are generally in excess of area availability and/or cost effectiveness. Second generation alkalinity-producing systems demonstrate that a combination of existing treatment mechanisms has the potential to overcome current design concerns and effectively treat acidic waters ad infinitum. Successive alkalinity-producing systems (SAPS) combine ALD technology with sulfate reduction mechanisms. SAPS promote vertical flow through rich organic wetland substrates into limestone beds beneath the organic compost, discharging the pore waters. SAPS allow for conservative wetland treatment sizing calculations to be made as a rate function based on pH and alkalinity values and associated contaminant loadings. SAPS potentially decrease treatment area requirements and have the further potential to generate alkalinity in excess of acidity regardless od acidity concentrations.
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