| Records |
| Author |
Anonymous; Unten, L.; Wildeman, T.R.; Gusek, J.J. |
Title  |
Passive treatment for contaminants in mine waters Effluent treatment in the mining industry |
Type |
Book Chapter |
| Year |
1998 |
Publication |
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Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
acid mine drainage; alkalinity; biodegradation; chemical reactions; coal mines; constructed wetlands; controls; degradation; heavy metals; ions; kinetics; metal ores; mines; mitigation; oxidation; pH; pollution; polymetallic ores; remediation; solubility; sulfate ion; sulfides; waste disposal; wetlands 22, Environmental geology |
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| Publisher |
University of Concepcion |
Place of Publication |
Concepcion |
Editor |
Castro, S.H.; Vergara, F.; Sanchez, M.A. |
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Original Title |
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University of Concepcion, D. of M.E.C.C. |
Series Title |
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Series Issue |
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Edition |
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| ISSN |
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ISBN |
9562271560 |
Medium |
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| Notes |
Passive treatment for contaminants in mine waters Effluent treatment in the mining industry; GeoRef; English; 2002-047084; References: 59; illus. incl. 3 tables |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 6215 |
Serial |
477 |
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| Author |
Rees, B.; Bowell, R.; Dey, M.; Williams, K. |
| Title |
Passive treatment; a walk away solution? |
Type |
Journal Article |
| Year |
2001 |
Publication |
Mining Environmental Management |
Abbreviated Journal |
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| Volume |
9 |
Issue |
2 |
Pages |
7-8 |
| Keywords |
acid mine drainage; acidification; alkalinity; bacteria; bioremediation; buffers; chemical reactions; cost; effluents; ferric iron; ferrous iron; filtration; ground water; hydrolysis; iron; metals; monitoring; oxidation; permeability; pH; pollution; remediation; substrates; sulfate ion; suspended materials; water management; water pollution; water quality; water treatment; wetlands 22, Environmental geology |
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Series Issue |
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Edition |
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| ISSN |
0969-4218 |
ISBN |
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Medium |
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Conference |
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| Notes |
Passive treatment; a walk away solution?; 2001-050826; References: 3; illus. United Kingdom (GBR); GeoRef; English |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 5722 |
Serial |
265 |
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| Author |
Ziemkiewicz, P.F.; Skousen, J.G.; Skousen, J.G.; Ziemkiewicz, P.F. |
| Title |
Prevention of acid mine drainage by alkaline addition |
Type |
Book Chapter |
| Year |
1996 |
Publication |
Acid mine drainage control and treatment |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
acid mine drainage; acidification; alkalinity; Appalachians; coal; land use; leachate; leaching; mines; mitigation; North America; oxidation; pollution; preventive measures; pyrite; reclamation; sampling; sedimentary rocks; soils; spoils; sulfides; surface water; techniques; United States; water pollution; water quality; water treatment; weathered materials; West Virginia 22, Environmental geology |
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West Virginia University and the National Mine Land Reclamation Center |
Place of Publication |
Morgantown |
Editor |
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Summary Language |
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Original Title |
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| Notes |
Prevention of acid mine drainage by alkaline addition; GeoRef; English; 2004-051146; Edition: 2 References: 18; illus. incl. 2 tables |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 6356 |
Serial |
185 |
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| Author |
Evangelou, V.P. |
| Title |
Pyrite microencapsulation technologies: Principles and potential field application |
Type |
Journal Article |
| Year |
2001 |
Publication |
Ecological Engineering |
Abbreviated Journal |
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| Volume |
17 |
Issue |
2-3 |
Pages |
165-178 |
| Keywords |
mine water treatment Acid mine drainage Acidity Alkalinity Amelioration Coating Oxidation Surface reactions |
| Abstract |
In nature, pyrite is initially oxidized by atmospheric O2, releasing acidity and Fe2+. At pH below 3.5, Fe2+ is rapidly oxidized by T. ferrooxidans to Fe3+, which oxidizes pyrite at a much faster rate than O2. Commonly, limestone is used to prevent pyrite oxidation. This approach, however, has a short span of effectiveness because after treatment the surfaces of pyrite particles remain exposed to atmospheric O2 and oxidation continuous abiotically. Currently, a proposed mechanism for explaining non-microbial pyrite oxidation in high pH environments is the involvement of OH- in an inner-sphere electron-OH exchange between pyrite/surface-exposed disulfide and pyrite/surface-Fe(III)(OH)n3-n complex and/or formation of a weak electrostatic pyrite/surface-CO3 complex which enhances the chemical oxidation of Fe2+. The above infer that limestone application to pyritic geologic material treats only the symptoms of pyrite oxidation through acid mine drainage neutralization but accelerates non-microbial pyrite oxidation. Therefore, only a pyrite/surface coating capable of inhibiting O2 diffusion is expected to control long-term oxidation and acid drainage production. The objective of this study was to examine the feasibility in controlling pyrite oxidation by creating, on pyrite surfaces, an impermeable phosphate or silica coating that would prevent either O2 or Fe3+ from further oxidizing pyrite. The mechanism underlying this coating approach involves leaching mine waste with a coating solution composed of H2O2 or hypochlorite, KH2PO4 or H4SiO4, and sodium acetate (NaAC) or limestone. During the leaching process, H2O2 or hypochlorite oxidizes pyrite and produces Fe3+ so that iron phosphate or iron silicate precipitates as a coating on pyrite surfaces. The purpose of NaAC or limestone is to eliminate the inhibitory effect of the protons (produced during pyrite oxidation) on the precipitation of iron phosphate or silicate and to generate iron-oxide pyrite coating, which is also expected to inhibit pyrite oxidation. The results showed that iron phosphate or silicate coating could be established on pyrite by leaching it with a solution composed of: (1) H2O2 0.018-0.16 M; (2) phosphate or silicate 10-3 to 10-2 M; (3) coating-solution pH [approximate]5-6; and (4) NaAC as low as 0.01 M. Leachates from column experiments also showed that silicate coatings produced the least amount of sulfate relative to the control, limestone and phosphate treatments. On the other hand, limestone maintained the leachate near neutral pH but produced more sulfate than the control. |
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0925-8574 |
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| Notes |
July 01; Pyrite microencapsulation technologies: Principles and potential field application; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/10063.pdf; Science Direct |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 10063 |
Serial |
37 |
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| Author |
Kepler, D.A.; Mc Cleary, E.C. |
| Title |
Successive Alkalinity-Producing Systems (SAPS) for the Treatment of Acid Mine Drainage |
Type |
Journal Article |
| Year |
1994 |
Publication |
Proceedings, International Land Reclamation and Mine Drainage Conference |
Abbreviated Journal |
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| Volume |
1 |
Issue |
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Pages |
195-204 |
| Keywords |
acid mine drainage; alkalinity; anaerobic environment; calcium carbonate; chemical reactions; experimental studies; pH; pollutants; pollution; remediation; water quality SAPS mine water RAPS |
| 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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Successive Alkalinity-Producing Systems (SAPS) for the Treatment of Acid Mine Drainage; Cn, Kj, Aj; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/9722.pdf; AMD ISI | Wolkersdorfer |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 9722 |
Serial |
55 |
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