Danielle Barnhill, '15
Danielle Barnhill was born and raised in Pensacola, Florida. She was awarded an Associate of Arts in Pre-Engineering from Pensacola State College. She is currently pursuing a bachelor's degree in Environmental Engineering at the University of Central Florida. She plans to pursue her Ph.D. focusing on the intersection of urban infrastructure and the environment. With these goals in mind, she plans to make her career a narrative of sustainability and resilience in the face of climate change.
Ph.D. in Environmental Engineering
Screening the Toxicity of Phosphorous-Removal Adsorbents Using A Bioluminescence Inhibition Test Conducted at the University of Central Florida Mentor: Dr. Steven J. Duranceau, P.E., Associate Professor- UCF Department of Civil Environmental and Construction Engineering Abstract: When found in excess, phosphorus (P) has been linked to surface water eutrophication. As a result, adsorbents are now used in P remediation efforts. However, possible secondary toxicological impacts on the use of new materials for P removal from surface water have not been reported. This study evaluated the toxicity of adsorbent materials used in the removal of P from surface water including: fly ash, bottom ash, alum sludge, a proprietary mix of adsorbents, and a proprietary engineered material. Toxicity screening was conducted by performing solid-liquid extractions (SLEs) followed by the bacterial bioluminescence inhibition test with a Microtox® M500. Of the materials tested, the samples extracted at lower pH levels demonstrated higher toxicity. The material exhibiting the most toxic response was the iron and aluminum oxide coated engineered material registering a 66–67% 15-min EC50 level for pH 4 and 5 SLEs, respectively. However, for SLEs prepared at pH 7, toxic effects were not detected for this engineered material. Fly ash and bottom ash demonstrated between 82 and 84% 15-min EC50 level, respectively, for pH 4 SLE conditions. Dried alum sludge and the proprietary mix of adsorbents were classified as having.
Barnhill, Danielle, "Danielle Barnhill, '15" (2017). McNair Scholars. 48.