Please note new meeting date and room. Meetings will now be held on the second Wednesday of the month in the Planning Commission Conference Room, same building and floor.
The Delaware River Watershed Initiative: Improving Water Quality, Involving 50+ NGOs and Building on Sound Science
William Penn Foundation
Stefanie Kroll, PhD
Academy of Natural Sciences
Abstract: Research has addressed the chemistry relevant to the environmental problem referred to as Acid mine drainage (AMD), resulting from the oxidation of metal-sulfides, primarily pyrite. This environmental impact of AMD includes acidification of rivers and streams as well as leaching of toxic metals from the metal-sulfide material. Studies in our laboratory have investigated the use of phospholipid layers on pyrite to suppress the oxidation of the mineral in abiotic and biotic conditions. Even in the presence of iron oxidizing bacteria the lipid layer, which assembles into a bilayer structure, significantly suppresses the rate of pyrite oxidation. Recent studies have investigated the ability of the adsorbed lipid layers to suppress pyrite oxidation under environmental conditions for times approaching three years. In particular, using columns packed with mining waste (with and without lipid adsorption), the release of sulfate and soluble iron was investigated in addition to the pH of the effluent. Mining waste that was pretreated with phospholipid was associated with an effluent that had a higher pH and significantly lower amounts of sulfate and iron than mining waste that was not pretreated with phospholipid. Metagenomic analysis of the microbial communities associated with the mining waste samples revealed the development of AMD-like communities dominated by acidophilic sulfide-oxidizing bacteria on untreated samples, but not on mining waste pretreated with phospholipid.
As a Program Officer with the William Penn Foundation, Nathan Boon supports science and data-driven approaches to protect and restore the Delaware River Watershed - drinking water source for 17 million from New York City to Philadelphia, Trenton, and Wilmington. Nathan was previously imbedded in francophone Cameroon with the 501 (c)(3) nonprofit Breaking Ground, engaged with a local municipality in water quality analysis and health impact assessment. Nathan's nonprofit experience also includes time as a board member with the American Water Resources Association, National Capital Region Section and membership with the American Public Health Association, Environment Section.
Nathan holds Bachelor's and Master's degrees in Earth and Environmental Science from Wesleyan University and a graduate certificate in Environmental Science, Health and Policy from the George Washington University School of Public Health. Before joining the Foundation in 2012, Nathan worked with the management consulting firm Booz Allen Hamilton. He is a certified Project Management Professional and Geographic Information Systems Professional
Stefanie Kroll's work focuses on using aquatic insects and other indicators to examine the impacts of human activities on aquatic ecosystems. Stefanie is the Project Science Director for the Delaware River Watershed Initiative at the Academy of Natural Sciences. She has a PhD in ecology from SUNY College of Environmental Science and Forestry in Syracuse, NY and a master's-equivalent on ecology of arid watersheds at the University of Castilla-La Mancha in Albacete, Spain. She did her post-doctoral work in the Department of Entomology at Cornell University. Dr. Kroll is currently an adjunct faculty member at Drexel University and has taught at Onondaga Community College and Colgate University. She worked in interpretation and translation and taught English as a foreign language for over a decade. Stefanie is on the monitoring advisory committee of the Raritan Headwaters Association and works with ANS' Women In Natural Sciences (WINS) program. Other research interests include aquatic insects and climate change, the ecology of Onondaga Lake (an ecosystem recovering from extensive pollution) and stream ecosystem dynamics in arid landscapes. She also worked for several years in forest inventory and providing program support for a nonprofit environmental organization.
|President:|| Chris McEntee, Greeley & Hansen
|President Elect:||Bridget Wadzuk, Villanova University|
|Vice President:||Benoit Van Aken, Temple University|
|Treasurer:||Bernadette Callahan, Stantec Consulting|
|Secretary:||Stefanie Rittenhouse, PA DEP Southeast Region|
|Membership Chair:||Adam Minichelli, Greeley & Hansen|
|Social Co-Chairs:||Nha Truong, Philadelphia Water Department|
|Daniel Wible, CH2M Hill|
|Student Co-Chairs:||Amanda Hess, Villanova University|
|Sibia Ranjbar, Temple University|
|Past President:||Jaclyn Rogers, Philadelphia Water Department|