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Author Banks, S.B. url  openurl
  Title The UK coal authority minewater-treatment scheme programme: Performance of operational systems Type Journal Article
  Year 2003 Publication Jciwem Abbreviated Journal  
  Volume (up) 17 Issue 2 Pages 117-122  
  Keywords mine water treatment  
  Abstract This paper summarises the performance of minewater-treatment schemes which are operated under the Coal Authority's National Minewater Treatment Programme. Commonly-used design criteria and performance indicators are briefly discussed, and the performance of wetland systems which are operated by the Coal Authority is reviewed. Most schemes for which data are available remove more than 90% iron, and average area-adjusted iron-removal rates range from 1.5 to 5.5 g Fe/m(2). d. These values, which are based on performance calculations, can be distorted by several factors, including the practice of maximising wetland areas to make best use of available land. Removal rates are limited by influent iron loadings, and area-adjusted iron-removal rates should be used with caution when assessing wetland performance. Sizing criteria for all types of treatment system might be refined if more detailed data become available.  
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  ISSN 0951-7359 ISBN Medium  
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  Notes May; The UK coal authority minewater-treatment scheme programme: Performance of operational systems; Wos:000183641000009; Times Cited: 1; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/10018.pdf; ISI Web of Science Approved no  
  Call Number CBU @ c.wolke @ 17457 Serial 9  
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Author Evangelou, V.P. url  openurl
  Title Pyrite microencapsulation technologies: Principles and potential field application Type Journal Article
  Year 2001 Publication Ecological Engineering Abbreviated Journal  
  Volume (up) 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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  ISSN 0925-8574 ISBN Medium  
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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 Goulet, R.R. url  openurl
  Title Changes in dissolved and total Fe and Mn in a young constructed wetland: Implications for retention performance Type Journal Article
  Year 2001 Publication Ecological Engineering Abbreviated Journal  
  Volume (up) 17 Issue 4 Pages 373-384  
  Keywords mine water treatment  
  Abstract Surface-flow wetlands are generally considered sinks for Fe and Mn but they may also export and affect the partitioning of these metals. This study was undertaken to evaluate the effect of a young constructed wetland on the retention and transformation of both dissolved and particulate Fe and Mn. Duplicate water samples were collected every three days at the inlet and outlet structures of the Monahan Wetland, Kanata, Ontario, from spring of 1997 to 1999. While on a yearly basis the wetland showed significant retention of che dissolved phase, the retention of total Fe and Mn was poor. There were strong seasonal differences in retention and, during the winter, the wetland was a source. The wetland transformed dissolved into particulate Fe and Mn from spring to fall whereas during the winter, dissolved Fe and Mn were released. Changes in pH, alkalinity and temperature could explain 11% and 40% of the outlet variation in the ratio of dissolved to total Fe and Mn respectively. Furthermore, from spring to late summer, planktonic algal biomass was negatively related to the ratio of dissolved to total Fe and Mn implying a role in Fe and Mn transformations in young wetlands where emergent and submerged vegetation have yet to dominate the system. (C) 2001 Elsevier Science B.V. All rights reserved.  
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  Notes Changes in dissolved and total Fe and Mn in a young constructed wetland: Implications for retention performance; Wos:000169881900004; Times Cited: 5; ISI Web of Science Approved no  
  Call Number CBU @ c.wolke @ 17050 Serial 124  
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Author Wiseman, I.M.; Rutt, G.P.; Edwards, P.J. url  openurl
  Title Constructed wetlands for minewater treatment: Environmental benefits and ecological recovery Type Journal Article
  Year 2004 Publication Water and Environment Journal Abbreviated Journal  
  Volume (up) 18 Issue 3 Pages 133-138  
  Keywords mine water treatment  
  Abstract The ecology of the River Pelenna (in South Wales) was impoverished by polluted discharges from abandoned coal mines. A series of passive constructed wetlands was created in order to treat these discharges and to improve the ecology of the river. A three-year Environment Agency R&D project investigated the performance, environmental benefits and sustainability of the constructed wetlands. It showed that the treatment systems were removing most of the iron contamination. In the reaches downstream from the minewaters, the dissolved-iron concentration quickly dropped below the target level. Invertebrate abundance, trout and riverine bird populations increased in following years. However, occasional overflows from the systems have significantly affected the ecology of one stretch of river The research work has provided an insight into the potential for ecological recovery associated with future minewater treatment.  
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  ISSN 1747-6585 ISBN Medium  
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  Notes Aug.; Constructed wetlands for minewater treatment: Environmental benefits and ecological recovery; Wos:000230520000002; Times Cited: 0; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/7891.pdf; ISI Web of Science Approved no  
  Call Number CBU @ c.wolke @ 7891 Serial 68  
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Author Gemmell, R.P. url  openurl
  Title The reclamation of acidic colliery spoil .2. The use of lime wastes Type Journal Article
  Year 1981 Publication Journal of Applied Ecology Abbreviated Journal  
  Volume (up) 18 Issue 3 Pages 879-887  
  Keywords mine water treatment  
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  Notes The reclamation of acidic colliery spoil .2. The use of lime wastes; Wos:A1981mx25300019; Times Cited: 3; ISI Web of Science Approved no  
  Call Number CBU @ c.wolke @ 9196 Serial 97  
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