Evaluation Of A Parking Lot Bioretention Cell For
Removal Of Stormwater Pollutants
Author(s)
C. Glass & S. Bissouma
Abstract
Bioretention is used to retain and treat urban stormwater, which has been
identified by the United States Environmental Protection Agency as one of the
most significant forms of water pollution. In this study, the efficiency of a
bioretention facility in terms of temperature, pH, dissolved oxygen, nutrients,
and heavy metals removal over a period of 15 rain events was evaluated. This
was performed by collecting representative samples of the stormwater runoff for
laboratory analysis of both the influent to and the effluent from the bioretention
cell. The bioretention was efficient in terms of pollutant removal in the
following order: TSS (~ 98%) > Zn (~ 80%) > Cu (~ 75%) > Pb (~ 71%) > Cd
(~ 70%) > NH3-N (~65%) > Fe (~ 51%) > Cr (~ 42%) > NO - 2-N (~ 27%) > Al
(~ 17%) > PO 3- 4-P (~3%). From the field results Cu (II), Zn (II) and Pb (II) were
removed significantly at 81%, 79% and 75%. The field results indicate that
bioretention facilities can be effective for the removal of heavy metals in the
following order: Cu > Zn > Pb > Cd > Fe > Cr > Al. Although the removal
efficiency for this actual field bioretention cell was not has high as previously
reported laboratory and field evaluations, removal of pollutants was significant.
Organic matter and plants were believed to be the dominant bioretention
elements for the removal of heavy metals.
Keywords: bioretention, stormwater, heavy metals, adsorption.
1 Introduction
Combined sewer overflows (CSO) continue to occur throughout major cities in
the Northeast, Great Lakes, and Northwest regions of the U.S., primarily as a
result of rainwater that is diverted from roads, parking lots, and the roofs of
buildings during storm events [1]. The rapid transport of water away from the
Keywords
bioretention, stormwater, heavy metals, adsorption.
Related Book
Other papers in this volume
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