Efficiency of Nitrate and Phosphorus Removal in a Working Rain Garden

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Rain gardens are low impact developments designed to mitigate a suite of issues associated with urban stormwater runoff. The site for this study was a Denton City rain garden at the Denton Waste Water Treatment Plant. Nitrogen and phosphorus removal was examined in light of two overflow events comprised of partially treated wastewater from an upslope anaerobic digester pond. Nitrate removal efficiency was examined across differing dry spell intervals of 5, 8, and 12 d, displaying a moderate negative correlation (r2 = 0.59). Continued phosphorus removal capacity was assessed, showing phosphorus removal in cases where P was in excess of ... continued below

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vii, 80 pages : illustrations (chiefly color), color map

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Strong, Patrick August 2015.

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This thesis is part of the collection entitled: UNT Theses and Dissertations and was provided by UNT Libraries to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 129 times , with 7 in the last month . More information about this thesis can be viewed below.

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  • Strong, Patrick

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Rain gardens are low impact developments designed to mitigate a suite of issues associated with urban stormwater runoff. The site for this study was a Denton City rain garden at the Denton Waste Water Treatment Plant. Nitrogen and phosphorus removal was examined in light of two overflow events comprised of partially treated wastewater from an upslope anaerobic digester pond. Nitrate removal efficiency was examined across differing dry spell intervals of 5, 8, and 12 d, displaying a moderate negative correlation (r2 = 0.59). Continued phosphorus removal capacity was assessed, showing phosphorus removal in cases where P was in excess of 0.8 mg/L, reflecting an equilibrium phosphorus concentration. A high expanded shale component in the soil media (25%) was likely a factor in the continued removal of phosphorus. Overall the rain garden proved to be a large source of nitrate (+425%) and total nitrogen (+61%) by mass. The study showed that while the rain garden intercepted a large volume of partially treated wastewater during the overflow events, preventing it from reaching a nearby creek, the mitigation of an acute event has extended to a chronic one as nitrogen is gradually processed and flushed from the system as nitrate.

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vii, 80 pages : illustrations (chiefly color), color map

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  • August 2015

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  • March 4, 2016, 4:14 p.m.

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  • April 20, 2017, 12:36 p.m.

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Strong, Patrick. Efficiency of Nitrate and Phosphorus Removal in a Working Rain Garden, thesis, August 2015; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc804969/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .