| Records |
| 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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0969-4218 |
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| Notes |
Passive treatment; a walk away solution?; 2001-050826; References: 3; illus. United Kingdom (GBR); GeoRef; English |
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no |
| Call Number |
CBU @ c.wolke @ 5722 |
Serial |
265 |
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| Author |
Kuyucak, N. |
| Title |
Acid mine drainage; treatment options for mining effluents |
Type |
Journal Article |
| Year |
2001 |
Publication |
Mining Environmental Management |
Abbreviated Journal |
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| Volume |
9 |
Issue |
2 |
Pages |
12-15 |
| Keywords |
acid mine drainage; alkalinity; cadmium; chemical reactions; copper; cyanides; decontamination; degradation; effluents; flotation; heavy metals; lead; lime; metals; mines; nickel; oxidation; pH; physicochemical properties; pollution; reagents; reduction; remediation; seepage; sludge; solid waste; solvents; stability; tailings; toxic materials; toxicity; waste disposal; water quality; zinc |
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0969-4218 |
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Acid mine drainage; treatment options for mining effluents; 2001-050827; References: 23; illus. United Kingdom (GBR); GeoRef; English |
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no |
| Call Number |
CBU @ c.wolke @ 5723 |
Serial |
324 |
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| Author |
Bernoth, L.; Firth, I.; McAllister, P.; Rhodes, S. |
| Title |
Biotechnologies for Remediation and Pollution Control in the Mining Industry |
Type |
Journal Article |
| Year |
2000 |
Publication |
Miner. Metall. Process. |
Abbreviated Journal |
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| Volume |
17 |
Issue |
2 |
Pages |
105-111 |
| Keywords |
bioremediation pollution control soil contamination solvents oils diesel hydrocarbons cyanide acid rock drainage microbial mats manganese bioremediation oxidation drainage removal water algae |
| Abstract |
As biotechnologies emerge from laboratories into main-stream application, the benefits they, offer are judged against competing technologies and business criteria. Bioremediation technologies have passed this test and are now widely used for the remediation of contaminated soils and ground waters. Bioremediation includes several distinct techniques that are used for the treatment of excavated soil and includes other techniques that are used for in situ applications. They play an important and growingrole in the mining industry for cost-effective waste management and site remediation. Most applications have been for petroleum contaminants, but advances continue to be made in the treatment of more difficult organ ic and inorganic species. This paper discusses the role of biotechnologies in remediation and pollution control from a mining-industry perspective. Several case studies are presented, including the land application of oily wastewater from maintenance workshops, the composting of hydrocarbon-contaminated soils and sludges, the bioventing of hydrocarbon solvents, the intrinsic bioremediation of diesel hydrocarbons, the biotreatment of cyanide in water front a gold mine, and the removal of manganese from acidic mine drainage. |
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0747-9182 |
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Biotechnologies for Remediation and Pollution Control in the Mining Industry; Isi:000087094600005; AMD ISI | Wolkersdorfer |
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no |
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CBU @ c.wolke @ 17307 |
Serial |
450 |
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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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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 |
Blowes, D.W.; Ptacek, C.J.; Benner, S.G.; McRae, C.W.T.; Puls, R.W. |
| Title |
Treatment of dissolved metals using permeable reactive barriers |
Type |
Journal Article |
| Year |
1998 |
Publication |
Groundwater Quality: Remediation and Protection |
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Issue |
250 |
Pages |
483-490 |
| Keywords |
adsorption; aquifers; attenuation; dissolved materials; metals; nutrients; oxidation; pollutants; pollution; precipitation; reduction; water treatment Groundwater quality Pollution and waste management non radioactive Groundwater acid mine drainage aquifer pollution conference proceedings containment barrier metal tailings Canada Ontario Nickel Rim Mine United States North Carolina Elizabeth City mine water treatment |
| Abstract |
Permeable reactive barriers are a promising new approach to the treatment of dissolved contaminants in aquifers. This technology has progressed rapidly from laboratory studies to full-scale implementation over the past decade. Laboratory treatability studies indicate the potential for treatment of a large number of inorganic contaminants, including As, Cd, Cr, Cu, Hg, Fe, Mn, Mo, Ni, Pb, Se, Tc, U, V, NO3, PO4, and SO4. Small scale field studies have indicated the potential for treatment of Cd, Cr, Cu, Fe, Ni, Pb, NO3, PO4, and SO4. Permeable reactive barriers have been used in full-scale installations for the treatment of hexavalent chromium, dissolved constituents associated with acid-mine drainage, including SO4, Fe, Ni, Co and Zn, and dissolved nutrients, including nitrate and phosphate. A full-scale barrier designed to prevent the release of contaminants associated with inactive mine tailings impoundment was installed at the Nickel Rim mine site in Canada in August 1995. This reactive barrier removes Fe, SO,, Ni and other metals. The effluent from the barrier is neutral in pH and contains no acid-generating potential, and dissolved metal concentrations are below regulatory guidelines. A full-scale reactive barrier was installed to treat Cr(VI) and halogenated hydrocarbons at the US Coast Guard site in Elizabeth City, North Carolina, USA in June 1996. This barrier removes Cr(VI) from >8 mg l(-1) to <0.01 mg l(-1). |
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0144-7815 |
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Treatment of dissolved metals using permeable reactive barriers; Isip:000079718200072; Times Cited: 0; ISI Web of Science |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 8601 |
Serial |
178 |
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