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Biogeochemical Gradients within an Acid Mine Drainage-Derived Iron Mound, North Lima, Ohio

Haake, Zachary J
http://rave.ohiolink.edu/etdc/view?acc_num=akron1397816537

Abstract Details

2014, Master of Science, University of Akron, Geology.
Acid mine drainage (AMD) is one of the most serious threats to the environment in coal mining regions. To try to determine appropriate treatment methods I evaluated the distribution of aqueous chemical species, Fe(III) minerals, and Fe- metabolizing bacteria in AMD-derived, Fe(III)-rich sediments within an AMD-impacted area of Northeast Ohio. A major goal of this work was to evaluate the depth-dependent distribution of microbially mediated redox reactions within the sediments. This research shows that aqueous Fe(II) was depleted in the sediments near the sediment-AMD interface, but increased with depth in the upper 2.5 cm of the sediments. This increase in Fe(II) concentration was likely due to Fe(III) reducing bacterial (FeRB) activities, since they were most abundant at approximately this depth interval, and poorly crystalline Fe(III) phases in the upper sediments were transformed to goethite (FeO(OH)) in deeper sediments, which is an indicator of FeRB activities. I also observed relatively uniform abundances of culturable Fe(II) oxidizing bacteria (FeOB) throughout the sediments, and aqueous Fe(II) was depleted below the 2.5 cm depth interval, despite minimal O2 availability at these depths. These results indicate that while FeRB may be active in shallower regions of the sediments, FeOB remain active throughout the sediments, and may mediate transfer of electrons from deeper, O2-depleted portions of the sediments to shallower, O2-rich portions of the sediments.
John Senko, Dr. (Advisor)
LaVerne Friberg, Dr. (Committee Member)
John Peck, Dr. (Committee Member)
43 p.
Geobiology; Geochemistry; Geology
Acid mine drainage; iron mound; depth-dependent geochemistry; depth-dependent mineralogy; depth-dependent distributions of microorganisms; extracellular electron transport

Recommended Citations

Citations

  • Haake, Z. J. (2014). Biogeochemical Gradients within an Acid Mine Drainage-Derived Iron Mound, North Lima, Ohio [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1397816537

    APA Style (7th edition)

  • Haake, Zachary. Biogeochemical Gradients within an Acid Mine Drainage-Derived Iron Mound, North Lima, Ohio. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1397816537.

    MLA Style (8th edition)

  • Haake, Zachary. "Biogeochemical Gradients within an Acid Mine Drainage-Derived Iron Mound, North Lima, Ohio." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1397816537

    Chicago Manual of Style (17th edition)

akron1397816537
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© 2014, some rights reserved.Creative Commons License Biogeochemical Gradients within an Acid Mine Drainage-Derived Iron Mound, North Lima, Ohio by Zachary J Haake is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.