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Acid Mine Drainage

Acid Mine Drainage . Visual Environmental Education Guide . The Problem . B asic definition: - T he overflow of acidic water from abandoned coal mines ( Websters Dictionary). Image from: http://mw2.google.com/ mw-panoramio / photos /medium/42656972.jpg . Examples of Acid Mine Drainage .

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Acid Mine Drainage

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  1. Acid Mine Drainage Visual Environmental Education Guide

  2. The Problem Basic definition: -The overflow of acidic water from abandoned coal mines (Websters Dictionary) Image from: http://mw2.google.com/mw-panoramio/photos/medium/42656972.jpg

  3. Examples of Acid Mine Drainage Image from: http://www.aeepartnership.org/acid_mine_drainage.php Image from:http://chemcollective.org/AMD/Amd.html

  4. Overview of Chemical Reactions Occurring • Main chemical reaction: the oxidization of pyrite (FeS2) • The 3 main chemical products formed in acid mine drainage reactions are: • Ferrous iron and sulfuric acid • Ferric iron • Eventually turns into iron hydroxide

  5. First Chemical Reaction:Oxidization of Pyrite +2 FeS2 + O2 + H2O –> Fe + H2SO4 or (pyrite + dissolved oxygen + water) -> (ferrous iron + sulfuric acid)

  6. Second Chemical Reaction:Oxidization of Soluble Iron +2 + +3 Fe + O2 + H –> Fe + H2O or (ferrous iron + oxygen +hydronium) -> (ferric iron + water)

  7. Third Chemical Reaction:Precipitation of Insoluble Iron +3 + Fe + H2O –> Fe(OH)3 + H or (ferric iron + water) -> (iron hydroxide + hydronium ) Image from: http://www.facstaff.bucknell.edu/kirby/AMD.html

  8. The Importance of the pH of Water • Water’s average pH is 7, which is basic • Acid mine drainage can make water’s pH as low as 2.5 Image from: http://pa.water.usgs.gov/projects/energy/amd/images/fig3b.gif

  9. Possible Forms of Treatment • Passive Treatment • Artificial Wetland Construction • Active Treatment • Chemical additives • Limestone or carbonate neutralization Image from: http://ots.blogs.bucknell.edu/files/2010/09/IMG_33691.jpg

  10. Mining Practices in the Susquehanna Valley Region Image from:http://www.dep.state.pa.us/dep/deputate/minres/bmr/annualreport/2010/Photo_Coming_out_of_the_mine.jpg Image from:http://www.airphotona.com/stockimg/images/00478.jpg

  11. Map of Rivers/Streams Affected by Acid Mine Drainage in Pennsylvania Image from:http://pa.water.usgs.gov/projects/energy/amd/images/amdmap.gif

  12. Regional Treatment Programs Image from:http://www.wpcamr.org/ Image from: http://epcamr.org/home/

  13. The Shamokin Creek Story Image from:http://farm4.staticflickr.com3591/3502701636_db54cf068f_z.jpg

  14. The Shamokin Creek Watershed Map Image from: http://www.facstaff.bucknell.edu/kirby/WshedMap.html

  15. Example of a Local Resource:Shamokin Creek Restoration Alliance • Image from:http://www.facstaff.bucknell.edu/kirby/ • 0SCRAnewHome/SCRAhome.htm

  16. Sources http://pa.water.usgs.gov/projects/energy/amd/ http://www.dep.state.pa.us/dep/deputate/minres/districts/AMDPostMortem.html http://epcamr.org/home/current-initiatives/ http://www.wpcamr.org/ http://www.shamokincreek.org/ http://www.facstaff.bucknell.edu/marsh/susquehanna/ehga.pdf http://reclamationresearch.net/publications/Final_Lit_Review_AMD.pdf http://www.facstaff.bucknell.edu/kirby/AMDPrimer.html

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