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  • Volume 57, Issue 5

Manganese removal and occurrence of manganese oxidizing bacteria in full-scale biofilters

M. S. Burger, C. A. Krentz, S. S. Mercer, G. A. Gagnon
Published August 2008, 57 (5) 351-359; DOI: 10.2166/aqua.2008.050
M. S. Burger
Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia, B3J 1Z1, Canada Tel.: +1 902 494 3268 Fax: +1 902 494 3108 E-mail: graham.gagnon@dal.ca
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C. A. Krentz
Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia, B3J 1Z1, Canada Tel.: +1 902 494 3268 Fax: +1 902 494 3108 E-mail: graham.gagnon@dal.ca
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S. S. Mercer
Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia, B3J 1Z1, Canada Tel.: +1 902 494 3268 Fax: +1 902 494 3108 E-mail: graham.gagnon@dal.ca
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G. A. Gagnon
Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia, B3J 1Z1, Canada Tel.: +1 902 494 3268 Fax: +1 902 494 3108 E-mail: graham.gagnon@dal.ca
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Abstract

Biological treatment of drinking water to remove manganese (Mn) is becoming more and more common. However, details as to how the technology works remain poorly understood. Some previous studies have focused on bacteria of the genus Leptothrix, identifying them as one of the predominant organisms in Mn oxidizing biofilms. This research took media from inside the filters of four Mn biofiltration plants in the province of New Brunswick, Canada. The water was characterized for all four sites and it was found that Mn removal from all plants is virtually 100%. Biofilm was detached from the sand and tested for presence of Leptothrix using real-tme polymerase chain reaction (RT-PCR) DNA amplification. Less specific testing for Mn oxidizing bacteria was done simultaneously using indicative agar plates. Results showed that only one plant contained Leptothrix in its filters while three of the four plants tested positive for manganese oxidizing bacteria (MOB) through plating. These results, along with other evidence, suggest that while the mechanism of oxidation observed is likely biological, Leptothrix is not necessarily the predominant organism carrying out biooxidation.

  • biofiltration
  • biological treatment
  • Leptothrix
  • manganese
  • polymerase chain reaction (PCR)
  • Received September 14, 2007.
  • Accepted November 26, 2007.
  • © IWA Publishing 2008

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Journal of Water Supply: Research and Technology - Aqua: 67 (2)
  Volume 57, Issue 5

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Manganese removal and occurrence of manganese oxidizing bacteria in full-scale biofilters
M. S. Burger, C. A. Krentz, S. S. Mercer, G. A. Gagnon
Journal of Water Supply: Research and Technology - Aqua Aug 2008, 57 (5) 351-359; DOI: 10.2166/aqua.2008.050
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Manganese removal and occurrence of manganese oxidizing bacteria in full-scale biofilters
M. S. Burger, C. A. Krentz, S. S. Mercer, G. A. Gagnon
Journal of Water Supply: Research and Technology - Aqua Aug 2008, 57 (5) 351-359; DOI: 10.2166/aqua.2008.050

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Keywords

biofiltration
biological treatment
Leptothrix
manganese
polymerase chain reaction (PCR)
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