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Monday
8:15 Brent Means
10:10 James J. Gusek
12:40 Jonathan M. Dietz
2:15 Kimberly R. Weaver
4:00 Brent Means

Tuesday
8:45 Robert Kleinmann
9:15 Brent Means
9:30 James J. Gusek
10:00 Glenn C. Miller
10:30 Linda Ann Figueroa
12:40 Art Rose
1:10 Charles A. Cravotta III
1:40 Danielle M C Huminicki
2:50 Bernard Aube
3:20 Timothy K. Tsukamoto
3:50 Bradley R. Shultz
4:20 Kimberly R. Weaver

Wednesday
8:00 Linda Ann Figueroa
8:30 John Senko
9:00 Song Jin
10:10 Jonathan M. Dietz
10:40 Daryle H. Fish
12:40 John Chermak
1:10 Griff Wyatt
1:40 Dan Mueller
2:50 Sean C. Muller
3:20 Jack Adams
3:50 Roger Bason
3:50 Mark B. Carew

Thursday
8:00 Rep. John E. Peterson
8:30 Scott Sibley
9:00 Charles A. Cravotta III
9:30 Michael R. Silsbee
10:30 Lykourgos Iordanidis
11:00 Mark Conedera
11:30 Barry Scheetz
1:25 William Benusa
1:55 Mike Sawayda
2:25 Susan J. Tewalt
3:25 Robert S. Hedin
3:55 Chad J. Penn
4:25 Ron Neufeld

Mn Recovery from Ozone Technology in Mine Water Trearment

Author(s)

Susan J. Tewalt
U.S. Geological Survey
MS 956 National Center
Reston, VA 20192
(703) 648-6437
stewalt@usgs.gov

Motoaki Sato
U.S. Geological Survey
MS 956 National Center
Reston, VA 20192
(703) 648-6766
msato@usgs.gov

Frank T. Dulong
U.S. Geological Survey
MS 956 National Center
Reston, VA 20192
(703) 648-6416
fdulong@usgs.gov

Kristin O. Dennen

Abstract

Manganese is an aesthetically undesirable metallic element that is difficult to remove from acidic to neutral pH mine drainage. In spite of the thermodynamic prediction that oxygen should oxidize dissolved manganese (Mn2+) to an oxide or a hydroxide, this does not happen. Bench-scale experiments at U.S. Geological Survey (USGS) labs have documented the capability of ozone to oxidize and precipitate dissolved manganese to manganese dioxide. The process was granted U.S. patent no. 6,485,696. The USGS installed a pilot-scale ozonation system at the Little Toby Creek Treatment Plant in Elk County, PA, which is a limestone-based acid mine drainage treatment plant operated by the Pennsylvania Department of Environmental Protection. Ten pairs of limestone-treated mine drainage water samples, collected in 2004 prior to and following ozone treatment, were analyzed. Measurements of Eh-pH values in the water samples subjected to ozone treatment demonstrate a shift from the Mn2+ field into the manganese dioxide (Mn4+) stability field. Dissolved concentrations in the treated effluent were lowered by 98 percent for manganese, by 99 percent for iron, by 78 percent for cobalt, and by 8 percent for nickel. The precipitate is generally sub-micron in size; the current bag filter system provides incomplete capture. Installation of a sedimentation pond would likely increase recovery of the MnO2. The pilot-scale system can generate 8 pounds of ozone per day and treat a flow of 30 gallons per minute. A new mine drainage site with high Mn2+ and low iron concentrations is being sought for possible installation of the system.

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