University of Vermont

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    "I learned that science can provide you with the outdoor adventure of a lifetime." — Ryan Sleeper

    Ryan SleeperEnvironmental sciences major, graduate student in natural resources, field research in Alaska, job with environmental consulting company. More about Ryan

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    "Here is a cool new technology for me to jump into that combines geography, natural resources, and information technology!" — Maya Thomas

    Maya ThomasEnvironmental sciences major, GIS minor, research internships, GIS specialist with consulting firm. More about Maya

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    "The hands-on learning approach allowed me to integrate classroom learning with real life experience." — Alex Marcucci

    Alex MarcucciEnvironmental sciences major, watershed steward & restoration intern, valued service-learning courses, environmental scientist with consulting firm. More about Alex

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    "I wanted to learn about how forest ecosystems work and find a job where I could be outside and do something meaningful."— Eric Donnelly

    Eric DonnellyForestry major, research project at UVM forest, forestry technician protecting society's forest-based natural resources long-term. More about Eric

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    "I knew I would be surrounded by individuals who shared many of the same passions."— Carson Casey

    Carson Casey Natural resources major, student government, research on clean energy for Vermont legislature, study abroad in Tanzania, job in renewable energy education. More about Carson

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    "I wanted to become more fluent in the natural history of the region and gain the skills needed to get my students learning outside." — Ryan Morra

    Ryan MorraMaster's degree in natural resources, project in Puerto Rico, professional development programs in sustainability for educators. More about Ryan

The Rubenstein School offers exciting, hands-on environmental programs that integrate natural sciences and social perspectives. Our small, close-knit community challenges students to discover knowledge, skills, and values to become innovative, environmentally-responsible leaders. More about our School | More about studying the environment at UVM

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  • Environmental Studies
  • Forestry
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 Graduate Degrees, Concentrations & Certificates



Monday August 3, 2015
Aiken 311
Light refreshments provided
Tuesday August 4, 2015
Aiken 311
Light refreshments provided
Monday August 17, 2015
Phosphate Removal and Recovery from Wastewater by Natural Materials for Ecologically Engineered Wastewater Treatment Systems

By Daniel T. Curran

Seminar: 12:00 pm, Aiken 311
Defense: 1:00 pm, Aiken 311

Kimberly F. Wallin, Ph.D., RSENR, Advisor
Stephanie E. Hurley, DDes, Plant and Soil Science, Chair
Donna M. Rizzo, Ph.D., Engineering

Eutrophication due to excess loading of phosphorus (P) is a leading cause of water quality degradation. This study investigated P removal and recovery with 4 calcite varieties, wollastonite, dolomite, hydroxylapatite, eggshells, coral sands, biochar, and activated carbon. This was accomplished through a series of batch experiments with synthetic wastewater solutions ranging from 10-100 mg PO4-P/ L. These results informed a large-scale, calcite-based column filter experiments located in the Aiken Center's Eco-Machine. Influent and effluent wastewater were sampled for 64 days. Changes in pH, P concentration and the mass of P adsorbed were utilized as measures of filter performance. Filter media was analyzed for the mineralogical content by X-ray diffraction (XRD).

In the batch experiments, P removal and recovery varied by media and treatment. The best performing materials were calcite, wollastonite, and hydroxylapatite, eggshells, activated carbon, and coral sands. The columns reduced P by 12.53% (se = 1.69) and P adsorption was 0.6490 mg PO4-P/ kg media (se = 0.0546) over a 4 h hydraulic retention time. P reductions were statistically significant (p-value < 0.05) on the majority of sampling dates until saturation. Saturation was reached after 31-35 days. Filter media buffered the pH of the wastewater to approximately 6.0-7.0 with no indication of diminishing buffer capacity. XRD analysis was not able to detect any P species within the filter media.

This research contributes to the understanding of how the selected media perform during P removal and recovery programs, while providing information on the performance of large filters operating within Eco-Machines.

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