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Hydraulic Response and Nitrogen Retention in Bioretention Mesocosms with Regulated Outlets: Part II—Nitrogen Retention

Lucas, William C. / Greenway, Margaret

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 (NO_x) and 4.67 mg/L total nitrogen for 1 year. The NO_x 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 NO_x and 1.46 mg/L total nitrogen, applied over 90 minutes. The outlet regulated treatment retained 68% NO_x and 60% total nitrogen, while the corresponding free draining treatment retained 25% NO_x and 27% total nitrogen. Over the following winter, the outlet regulated treatment retained 50% NO_x and 73% total nitrogen, while the corresponding free draining treatment exported 17% more NO_x, while retaining 50% total nitrogen.

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Hydraulic Response and Nitrogen Retention in Bioretention Mesocosms with Regulated Outlets: Part II—Nitrogen Retention

Lucas, William C. / Greenway, Margaret

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 (NO_x) and 4.67 mg/L total nitrogen for 1 year. The NO_x 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 NO_x and 1.46 mg/L total nitrogen, applied over 90 minutes. The outlet regulated treatment retained 68% NO_x and 60% total nitrogen, while the corresponding free draining treatment retained 25% NO_x and 27% total nitrogen. Over the following winter, the outlet regulated treatment retained 50% NO_x and 73% total nitrogen, while the corresponding free draining treatment exported 17% more NO_x, while retaining 50% total nitrogen.

Hydraulic Response and Nitrogen Retention in Bioretention Mesocosms with Regulated Outlets: Part II—Nitrogen Retention

Lucas, William C. / Greenway, Margaret

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 (NO_x) and 4.67 mg/L total nitrogen for 1 year. The NO_x 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 NO_x and 1.46 mg/L total nitrogen, applied over 90 minutes. The outlet regulated treatment retained 68% NO_x and 60% total nitrogen, while the corresponding free draining treatment retained 25% NO_x and 27% total nitrogen. Over the following winter, the outlet regulated treatment retained 50% NO_x and 73% total nitrogen, while the corresponding free draining treatment exported 17% more NO_x, while retaining 50% total nitrogen.

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Title:

Hydraulic Response and Nitrogen Retention in Bioretention Mesocosms with Regulated Outlets: Part II—Nitrogen Retention

Contributors:

Lucas, William C. (author) / Greenway, Margaret (author)

Published in:

Water Environment Research ; 83 ; 703-713

Publication date:

2011-08-01

Size:

11 pages

ISSN:

1554-7531 , 1061-4303

DOI:

https://doi.org/10.2175/106143011X12989211840936

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

nitrogen retention , hydraulic controls , seasonal trends , plant uptake , immobilization , bioretention

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