University Events

Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
Seminar Announcement

"Micro-siting and Nitrogen Removal Efficiency of a Liquid Injection Permeable Reactive Barrier (PRB)"

Jessica Thomas
PhD Candidate
Department of Estuarine and Ocean Sciences
SMAST at UMass Dartmouth


Wednesday, September 29, 2021
12:30 pm to 1:30 pm
SMAST East Rooms 101/102
And Via Zoom

Abstract
As development of coastal areas has increased, nutrient loads and particularly nitrogen (NO3-, NO2-, and NH4) have also increased significantly. In addition to the known health impacts that nitrogen (as nitrate) can have on people through drinking water, receiving coastal waters are severely impacted. Southeastern Massachusetts estuaries have been experiencing negative impacts from watershed nitrogen inputs resulting in nitrogen enrichment, eutrophication, and declines in ecosystem health. As a result of the wide-spread occurrence of estuarine nitrogen enrichment, variety of techniques are being explored by towns throughout southeastern Massachusetts to mitigate nitrogen inputs from watersheds to their estuaries. One of the techniques that has seen increased interest due to its moderate cost, ease of installation, and low impact to the environment is the liquid injection PRB. This research investigates the utility of using liquid injection PRBs for restoration of estuarine water quality.
For PRB technology to be an effective mitigation method it must be specifically installed to meet local site conditions. Micro-siting techniques were implemented in the installation and design of a the PRB to maximize reduction of nitrogen per unit cost. After the PRB was correctly sited the amount of nitrogen reduction that can be achieved in groundwater from residential areas was established. To better understand the biogeochemistry associated with PRBs and to optimize future PRB installations the extent to which the liquid injectate forming the PRB, emulsified vegetable oil (EVO), travels with groundwater and spreads from point of injection was investigated. Additionally, secondary reactions that occur in reducing conditions were monitored to evaluate their impact to the groundwater and receiving water bodies.
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For additional information, please contact Sue Silva at s1silva@umassd.edu