| Records |
| Author |
Foucher, S.; Battaglia-Brunet, F.; Ignatiadis, I.; Morin, D. |
| Title |
Treatment by sulfate-reducing bacteria of Chessy acid-mine drainage and metals recovery |
Type |
Journal Article |
| Year |
2001 |
Publication |
Chemical Engineering Science |
Abbreviated Journal |
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| Volume |
56 |
Issue |
4 |
Pages |
1639-1645 |
| Keywords |
Acid mine drainage Sulfate-reducing bacteria Sulfide precipitation Hydrogen transfer Fixed bed column reactor |
| Abstract |
Acid-mine drainage can contain high concentrations of heavy metals and release of these contaminants into the environment is generally avoided by lime neutralization. However, this classical treatment is expensive and generates large amounts of residual sludge. The selective precipitation of metals using H2S produced biologically by sulfate-reducing bacteria has been proposed as an alternative process. Here, we report on experiments using real effluent from the disused Chessy-les-Mines mine-site at the laboratory pilot scale. A fixed-bed bioreactor, fed with an H2/CO2 mixture, was used in conjunction with a gas stripping column. The maximum rate of hydrogen transfer in the bioreactor was determined before inoculation. kLa was deduced from measurements of O2 using Higbie and Danckwert's models which predict a dependence on diffusivity. The dynamic method of physical absorption and desorption was used. The maximum rate of H2 transfer suggests that this step should not be a limiting factor. However, an increase in H2 flow rate was observed to induce an increase in sulfate reduction rate. For the precipitation step, the gas mixture from the bioreactor was bubbled into a stirred reactor fed with the real effluent. Cu and Zn could be selectively recovered at pH=2.8 and pH=3.5, respectively. Other impurities such as Ni and Fe could also be removed at pH=6 by sulfide precipitation. Part of the outlet stream from the bioreactor was used to regulate and maintain the pH during sulfide precipitation by feeding the outlet stream back into the bioreactor. The replacement of synthetic medium with real effluent had a positive effect on sulfate reduction rate which increased by 30-40%. This improvement in bacterial efficiency may be related to the large range of oligo-elements provided by the mine-water. The maximum sulfate reduction rate observed with the real effluent was 200 mgl-1 h-1, corresponding to a residence time of 0.9 day. A preliminary cost estimation based on a treatment rate of 5 m3 h-1 of a mine effluent containing 5 gl-1 SO42- is presented. |
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0009-2509 |
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Feb.; Treatment by sulfate-reducing bacteria of Chessy acid-mine drainage and metals recovery; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/10064.pdf; Science Direct |
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CBU @ c.wolke @ 10064 |
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54 |
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| Author |
Kuyucak, N. |
| Title |
Mining, the Environment and the Treatment of Mine Effluents |
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Journal Article |
| Year |
1998 |
Publication |
Int. J. Environ. Pollut. |
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| Volume |
10 |
Issue |
2 |
Pages |
315-325 |
| Keywords |
mine water treatment acid mine drainage high density sludge lime neutralization mining environment passive treatment sulfate-reducing bacteria |
| Abstract |
The environmental impact of mining on the ecosystem, including land, water and air, has become an unavoidable reality. Guidelines and regulations have been promulgated to protect the environment throughout mining activities from start-up to site decommissioning. In particular, the occurrence of acid mine drainage (AMD), due to oxidation of sulfide mineral wastes, has become the major area of concern to many mining industries during operations and after site decommissioning. AMD is characterized by high acidity and a high concentration of sulfates and dissolved metals. If it cannot be prevented or controlled, it must be treated to eliminate acidity, and reduce heavy metals and suspended solids before release to the environment. This paper discusses conventional and new methods used for the treatment of mine effluents, in particular the treatment of AMD. |
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0957-4352 |
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Mining, the Environment and the Treatment of Mine Effluents; Isi:000078420600009; AMD ISI | Wolkersdorfer |
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CBU @ c.wolke @ 17477 |
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56 |
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Benner, S.G.; Blowes, D.W.; Ptacek, C.J. |
| Title |
A full-scale porous reactive wall for prevention of acid mine drainage |
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Journal Article |
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1997 |
Publication |
Ground Water Monitoring and Remediation |
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17 |
Issue |
4 |
Pages |
99-107 |
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acid mine drainage alkalinity bacteria Canada case studies concentration dissolved materials drainage Eastern Canada ground water mines observation wells Ontario permeability pH pollution porous materials recharge reduction remediation site exploration Sudbury District Ontario sulfate ion surface water waste disposal water pollution Groundwater quality Groundwater problems and environmental effects Pollution and waste management non radioactive geographical abstracts: physical geography hydrology (71 6 11) geomechanics abstracts: excavations (77 10 10) geological abstracts: environmental geology (72 14 2) groundwater protection permeable barrier acid mine drainage aquifer groundwater acid min drainage contamination permeable barrier groundwater protection permeable barrier acid mine drainage aquifer Canada, Ontario, Sudbury, Nickel Rim |
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The generation and release of acidic drainage containing high concentrations of dissolved metals from decommissioned mine wastes is an environmental problem of international scale. A potential solution to many acid drainage problem is the installation of permeable reactive walls into aquifers affected by drainage water derived from mine waste materials. A permeable reactive wall installed into an aquifer impacted by low-quality mine drainage waters was installed in August 1995 at the Nickel Rim mine site near Sudbury, Ontario. The reactive mixture, containing organic matter, was designed to promote bacterially mediated sulfate reduction and subsequent metal sulfide precipitation. The reactive wall is installed to an average depth of 12 feet (3.6 m) and is 49 feet (15 m) long perpendicular to ground water flow. The wall thickness (flow path length) is 13 feet (4 m). Initial results, collected nine months after installation, indicate that sulfate reduction and metal sulfide precipitation is occurring. Comparing water entering the wall to treated water existing the wall, sulfate concentrations decrease from 2400 to 4600 mg/L to 200 to 3600 mg/L; Fe concentration decrease from 250 to 1300 mg/L to 1.0 to 40 mg/L, pH increases from 5.8 to 7.0; and alkalinity (as CaCO<inf>3</inf>) increases from 0 to 50 mg/L to 600 to 2000 mg/L. The reactive wall has effectively removed the capacity of the ground water to generate acidity on discharge to the surface. Calculations based on comparison to previously run laboratory column experiments indicate that the reactive wall has potential to remain effective for at least 15 years. |
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Dr. S.G. Benner, Earth Sciences Department, University of Waterloo, Waterloo, Ont. N2L 3G1, Canada |
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1069-3629 |
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Review; A full-scale porous reactive wall for prevention of acid mine drainage; 0337197; United-States 46; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/10621.pdf; Geobase |
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CBU @ c.wolke @ 17555 |
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67 |
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| Author |
Fisher, T.S.R.; Lawrence, G.A. |
| Title |
Treatment of acid rock drainage in a meromictic mine pit lake |
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Journal Article |
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2006 |
Publication |
Journal of environmental engineering |
Abbreviated Journal |
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| Volume |
132 |
Issue |
4 |
Pages |
515-526 |
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Pollution and waste management non radioactive Groundwater problems and environmental effects geological abstracts: environmental geology (72 14 2) geomechanics abstracts: excavations (77 10 10) meromictic lake acid mine drainage mine waste copper water pollution Bacteria microorganisms Canada Vancouver Island British Columbia North America |
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The Island Copper Mine pit near Port Hardy, Vancouver Island, B.C., Canada, was flooded in 1996 with seawater and capped with fresh water to form a meromictic (permanently stratified) pit lake of maximum depth 350 m and surface area 1.72 km2. The pit lake is being developed as a treatment system for acid rock drainage. The physical structure and water quality has developed into three distinct layers: a brackish and well-mixed upper layer; a plume stirred intermediate layer; and a thermally convecting lower layer. Concentrations of dissolved metals have been maintained well below permit limits by fertilization of the surface waters. The initial mine closure plan proposed removal of heavy metals by metal-sulfide precipitation via anaerobic sulfate-reducing bacteria, once anoxic conditions were established in the intermediate and lower layers. Anoxia has been achieved in the lower layer, but oxygen consumption rates have been less than initially predicted, and anoxia has yet to be achieved in the intermediate layer. If anoxia can be permanently established in the intermediate layer then biogeochemical removal rates may be high enough that fertilization may no longer be necessary. < copyright > 2006 ASCE. |
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Prof. G.A. Lawrence, Univ. of British Columbia, Vancouver, BC V6T 1Z4, Canada lawrence@civil.ubc.ca |
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0733-9372 |
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Apr.; Treatment of acid rock drainage in a meromictic mine pit lake; 2873922; United-States 38; Geobase |
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CBU @ c.wolke @ 17494 |
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72 |
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| Author |
Yernberg, W.R. |
| Title |
Improvements seen in acid-mine-drainage technology |
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Journal Article |
| Year |
2000 |
Publication |
Min. Eng. |
Abbreviated Journal |
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52 |
Issue |
9 |
Pages |
67-70 |
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acid mine drainage; bacteria; chemical weathering; coal mines; Colorado; copper ores; effects; geochemistry; hydrogen; inorganic acids; international cooperation; ions; lead ores; medical geology; metal ores; mines; molybdenum ores; oxidation; pH; pollution; prediction; pyrite; reclamation; remediation; research; risk assessment; silicates; soil treatment; solid waste; sulfides; sulfuric acid; Summitville Mine; tailings; tailings ponds; technology; United States; waste disposal; weathering; zinc ores 22, Environmental geology |
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0026-5187 |
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Improvements seen in acid-mine-drainage technology; 2000-069686; illus. incl. sect., sketch map United States (USA); GeoRef; English |
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CBU @ c.wolke @ 5808 |
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73 |
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