Hydraulic response and nitrogen retention in bioretention mesocosms with regulated outlets: Part II—Nitrogen Retention

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Title Hydraulic response and nitrogen retention in bioretention mesocosms with regulated outlets: Part II—Nitrogen Retention
Author Lucas, Bill; Greenway, Margaret
Journal Name Water Environment Research
Year Published 2011
Place of publication United States
Publisher Water Environment Federation
Abstract We observed dissolved nitrogen retention in vegetated bioretention mesocosms using different media with varying hydraulic conductivities. Elevated outlets were installed to regulate hydraulic response, with one treatment left free draining. The treatments (three replicates each) were loaded weekly with 50 cm of effluent averaging 2.47 mg/L nitrogen oxides (NOx) and 4.67 mg/L total nitrogen for 1 year. The NOx and total nitrogen retention by the outlet regulated treatments was significantly greater than the unregulated treatment. The systems then were dosed 6 times with 53 cm of synthetic stormwater averaging 0.77 mg/L NOx and 1.46 mg/L total nitrogen, applied over 90 minutes. The outlet regulated treatment retained 68% NOx and 60% total nitrogen, while the corresponding free draining treatment retained 25% NOx and 27% total nitrogen. Over the following winter, the outlet regulated treatment retained 50% NOx and 73% total nitrogen, while the corresponding free draining treatment exported 17% more NOx, while retaining 50% total nitrogen.
Peer Reviewed Yes
Published Yes
Alternative URI http://www.ingentaconnect.com/content/wef/wer/2011/00000083/00000008/art00004
Volume 83
Issue Number 8
Page from 703
Page to 713
ISSN 1061-4303
Date Accessioned 2012-01-10; 2012-02-16T05:40:19Z
Date Available 2012-02-16T05:40:19Z
Research Centre Atmospheric Environment Research Centre
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Technologies
URI http://hdl.handle.net/10072/42822
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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