Florence Ling, Ph.D., Postdoctoral Researcher, Civil and Environmental Engineering Department, Princeton University
“ Treating Acid Mine Drainage with Biomineral Engineering“
Frick Laboratory, Princeton University
Mixer 5:30 pm; Presentation 6:30 pm followed by dinner.
Abstract: In Pennsylvania, the state’s history of mining has led to an acid mine drainage problem. Acid mine drainage results in streams with high acidities, the presence of iron hydr(oxide) precipitates, and high dissolved metal concentrations. Precipitated iron (hydr)oxides in affected streams can smother plant and wildlife, disrupting river ecosystems. Treatment of acid mine drainage systems often involve the addition of lime to neutralize the acidity, but the removal of contaminant metals needs to be addressed as well. At several Pennsylvanian acid mine drainage sites that contain high manganese concentrations, metal removal methods are challenged by the environmental conditions required to remove manganese from streamwater as manganese oxide. Using metal removal units developed by EcoIslands LLC, we work to promote the growth of bacteria and fungi in treatment systems that can help overcome environmental barriers for manganese oxide precipitation. Once dissolved manganese is precipitated as a manganese oxide, it is capable of pulling out a range of other contaminants, including Pb, Zn, and Ni. We investigate the promotion of manganese oxide bio-precipitation for acid mine drainage remediation, and how to optimize manganese oxide properties for contaminant uptake. The preferential formation of the layered manganese oxide, birnessite, may increase uptake of contaminants.
Biography: Florence Ling is an Environmental Geochemist, currently working as a Postdoctoral Researcher at Princeton University in the Civil and Environmental Engineering Department. She received her Ph.D. in 2016 from Pennsylvania State University in the Geosciences, and her B.A. in 2011 from Dartmouth College in Environmental Earth Science. Florence’s research focuses on environmental applications of mineral-fluid reactions. She is interested in understanding how various minerals can be used to uptake contaminants in the environment, and how to optimize these processes. During her Ph.D., she examined manganese oxides precipitated at acid mine drainage sites for metal removal. Currently at Princeton, Florence studies barite co-precipitation with hazardous ions for the removal of trace contaminants in fracking water. She is also working on a project that examines carbonate precipitation in the subsurface for the geologic storage of CO2.
Reservations: The meeting will be held in Frick Laboratory, Princeton University. The social mixer will begin at 5:30 pm in the CaFe area of Taylor Commons. The lecture will be held in the Auditorium at 6:30 pm followed by dinner in Taylor Commons (CaFe area). Frick Laboratory is located at the east end of the pedestrian bridge on Washington Rd, adjacent to the Weaver Track and Field Stadium. Parking is available in Lot 21, corner of Faculty Road and Fitzrandolph Road or other lots along Ivy Lane (see http://m.princeton.edu/map/). The seminar is free and open to the public. Reservations are required for dinner, which is $20 ($10 for students). Please contact Louise Lawter at email@example.com or 215-428-1475 by April 15 to make reservations. Reservations must be canceled no later than April 19 to avoid being billed for the dinner.