Water Quality Improvement through Reductions of Pollutant Loads Using Bioretention
Publication: Journal of Environmental Engineering
Volume 135, Issue 8
Abstract
As an increasingly adopted storm-water best management practice (BMP) to remedy hydrology and water quality impairment from urban development, bioretention facilities need rigorous investigation to quantify performance benefits and to allow design improvements. This study examines water quality improvements [total arsenic, total cadmium, chloride, total chromium, total and dissolved copper, E. coli, fecal coliform, lead, mercury, nitrogen species, oil and grease, phosphorus, total organic carbon (TOC), total suspended solids, and total zinc] via monitoring for a 15-month period at two bioretention cells in Maryland. Both bioretention cells effectively removed suspended solids, lead, and zinc from runoff through concentration reduction. Runoff volume reduction promotes pollutant mass removal and links BMP water quality benefits with hydrologic performance. From a load perspective , all but TOC at one cell showed pollutant reduction. Bioretention effluents exhibited good water quality for all significant pollutants except for nitrate, copper, and phosphorus in one cell, the latter two of which may be attributed to media organic matter dissolution. Copper dissolved/particulate analyses showed that significant changes in copper speciation behavior result from transport through the bioretention media.
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Acknowledgments
The writers thank Craig Carson, Chen Chiu, Katie DiBlasi, Kevin J. Edwards, Howard P. Grossenbacher, Philip Jones, Rebecca C. Stack, Jim H. Stagge, Mark Wilcox, and Lan Zhang for help with sample collections. This research was supported by Prince George’s County (Md.), Department of Environmental Resources under the guidance of Dr. Mow-Soung Cheng.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 135 • Issue 8 • August 2009
Pages: 567 - 576
Copyright
© 2009 ASCE.
History
Received: Jul 28, 2008
Accepted: Nov 11, 2008
Published online: Apr 3, 2009
Published in print: Aug 2009
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