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Author Bolzicco, J.; Carrera, J.; Ayora, C. openurl 
  Title Eficiencia de la barrera permeable reactiva de Aznalcollar (Sevilla, Espana) como remedio de aguas acidas de mina. Reactive permeable disposal barrier at Aznalcollar Mine, Seville, Spain; as remediation for acid mine drainage Type Journal Article
  Year 2004 Publication Revista Latino-Americana de Hidrogeologia Abbreviated Journal  
  Volume 4 Issue Pages 27-34  
  Keywords (up) abandoned mines acid mine drainage Agrio River Andalusia Spain aquifers Aznalcollar Mine Cenozoic chemical composition chemical ratios copper ores dams disposal barriers drainage basins Europe geochemistry ground water Guadiamar River hydrochemistry Iberian Peninsula Iberian pyrite belt igneous rocks metal ores mineral composition mines mining Miocene Neogene permeability pH pollution reactive barriers remediation sedimentary rocks sediments Seville Spain Southern Europe Spain surface water tailings Tertiary volcanic rocks waste disposal water treatment zinc ores 22, Environmental geology  
  Abstract As a result of the collapse of a mine tailing dam in april 1998 about 40 km of the Agrio and Guadiamar valleys were covered with a layer of pyrite sludge. Although most of the sludge was removed, a small amount remains in the soil of the Agrio valley and the aquifer remains polluted with acid water (ph<4) and metals (10 mg/L Zn, 5 mg/L Cu and Al). A permeable reactive barrier was build across the aquifer to increase the alcalinity and retain the metals. The barrier is made up of three sections of 30 m longX1.4 m thickX5 m deep (average) containing different proportions of limestone gravel, organic compost and zero-valent iron. The residence time of the water in the barrier is about two days. Within the barrier, the pH values increase to near neutral mainly due to calcite dissolution. Metals co-precipitate as oxyhydroxides, and they are also adsorbed on the organic matter surface. Down-stream the barrier, the total pollution removal is around 60-90% for Zn and Cu, and from 50 to 90% for Al and acidity.  
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  Notes Eficiencia de la barrera permeable reactiva de Aznalcollar (Sevilla, Espana) como remedio de aguas acidas de mina. Reactive permeable disposal barrier at Aznalcollar Mine, Seville, Spain; as remediation for acid mine drainage; 2004-072864; References: 7; illus. incl. geol. sketch map Brazil (BRA); GeoRef; Spanish Approved no  
  Call Number CBU @ c.wolke @ 16471 Serial 443  
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Author Benner, S.G.; Blowes, D.W.; Ptacek, C.J. url  openurl
  Title A full-scale porous reactive wall for prevention of acid mine drainage Type Journal Article
  Year 1997 Publication Ground Water Monitoring and Remediation Abbreviated Journal  
  Volume 17 Issue 4 Pages 99-107  
  Keywords (up) 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  
  Abstract 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.  
  Address Dr. S.G. Benner, Earth Sciences Department, University of Waterloo, Waterloo, Ont. N2L 3G1, Canada  
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  Notes 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 Approved no  
  Call Number CBU @ c.wolke @ 17555 Serial 67  
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Author Taylor, J.; Waters, J. openurl 
  Title Treating ARD; how, when, where and why Type Journal Article
  Year 2003 Publication Mining Environmental Management Abbreviated Journal  
  Volume 11 Issue 3 Pages 6-9  
  Keywords (up) acid mine drainage; acid rock drainage; acidification; alkalinity; carbonate rocks; chemical properties; chemical reactions; coal; disposal barriers; economics; flocculation; ground water; heavy metals; human activity; ion exchange; limestone; mines; oxidation; oxides; permeability; pollution; porosity; pyrolusite; remediation; sedimentary rocks; surface water; waste disposal; waste management; water pollution; water treatment; wetlands 22, Environmental geology  
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  Notes Treating ARD; how, when, where and why; 2004-045038; References: 8; illus. incl. 2 tables United Kingdom (GBR); GeoRef; English Approved no  
  Call Number CBU @ c.wolke @ 5528 Serial 225  
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Author Smyth, D.; Blowes, D.; Ptacek, C.; Bain, J. url  openurl
  Title Application of permeable reactive barriers for treating mine drainage and dissolved metals in groundwater Type Journal Article
  Year 2004 Publication Geotechnical News Abbreviated Journal  
  Volume 22 Issue 1 Pages 39-44  
  Keywords (up) acid mine drainage; acid rock drainage; aquifers; Canada; Cochrane District Ontario; concentration; disposal barriers; Eastern Canada; ground water; Kidd Creek; mine drainage; mines; Ontario; oxidation; permeability; permeable reactive barrier; pollutants; pollution; remediation; sulfates; sulfides; tailings; testing; Timmins Ontario; waste disposal; waste management; waste rock; waste water; water treatment 22, Environmental geology  
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  Notes Application of permeable reactive barriers for treating mine drainage and dissolved metals in groundwater; 2006-058196; References: 20; sects. Canada (CAN); GeoRef; English Approved no  
  Call Number CBU @ c.wolke @ 5457 Serial 66  
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Author Rees, B.; Bowell, R.; Dey, M.; Williams, K. openurl 
  Title Passive treatment; a walk away solution? Type Journal Article
  Year 2001 Publication Mining Environmental Management Abbreviated Journal  
  Volume 9 Issue 2 Pages 7-8  
  Keywords (up) 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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  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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