Understanding Urban Stormwater Denitrification in Bioretention Internal Water Storage Zones

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dc.contributor.advisorDavis, Allen Pen_US
dc.contributor.authorIgielski, Sara Jasmineen_US
dc.contributor.departmentCivil Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2016-09-15T05:33:40Z
dc.date.available2016-09-15T05:33:40Z
dc.date.issued2016en_US
dc.description.abstractFree-draining bioretention systems commonly demonstrate poor nitrate removal. In this study, column tests verified the necessity of a permanently saturated zone to target nitrate removal via denitrification. Experiments determined a first-order denitrification rate constant of 0.0011 min-1 specific to Willow Oak woodchip media. A 2.6-day retention time reduced 3.0 mgN/L to below 0.05 mg-N/L. During simulated storm events, hydraulic retention time may be used as a predictive measurement of nitrate fate and removal. A minimum 4.0 hour retention time was necessary for in-storm denitrification defined by a minimum 20% nitrate removal. Additional environmental parameters, e.g., pH, temperature, oxidation-reduction potential, and dissolved oxygen, affect denitrification rate and response, but macroscale measurements may not be an accurate depiction of denitrifying biofilm conditions. A simple model was developed to predict annual bioretention nitrate performance. Novel bioretention design should incorporate bowl storage and large subsurface denitrifying zones to maximize treatment volume and contact time.en_US
dc.identifierhttps://doi.org/10.13016/M20B84
dc.identifier.urihttp://hdl.handle.net/1903/18824
dc.language.isoenen_US
dc.subject.pqcontrolledEnvironmental engineeringen_US
dc.subject.pqcontrolledCivil engineeringen_US
dc.subject.pquncontrolledbioretentionen_US
dc.subject.pquncontrolleddenitrificationen_US
dc.subject.pquncontrollednitrogenen_US
dc.titleUnderstanding Urban Stormwater Denitrification in Bioretention Internal Water Storage Zonesen_US
dc.typeThesisen_US

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