Characterising nutrients wash-off for effective urban stormwater treatment design

Miguntanna, Nandika Prasadani, Liu, An, Egodawatta, Prasanna, & Goonetilleke, Ashantha (2013) Characterising nutrients wash-off for effective urban stormwater treatment design. Journal of Environmental Management, 120, pp. 61-67.

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Abstract

This paper characterises nitrogen and phosphorus wash-off processes on urban road surfaces to create fundamental knowledge to strengthen stormwater treatment design. The study outcomes confirmed that the composition of initially available nutrients in terms of their physical association with solids and chemical speciation determines the wash-off characteristics. Nitrogen and phosphorus wash-off processes are independent of land use, but there are notable differences. Nitrogen wash-off is a “source limiting” process while phosphorus wash-off is “transport limiting”. Additionally, a clear separation between nitrogen and phosphorus wash-off processes based on dissolved and particulate forms confirmed that the common approach of replicating nutrients wash-off based on solids wash-off could lead to misleading outcomes particularly in the case of nitrogen. Nitrogen is present primarily in dissolved and organic form and readily removed even by low intensity rainfall events, which is an important consideration for nitrogen removal targeted treatment design. In the case of phosphorus, phosphate constitutes the primary species in wash-off for the particle size fraction <75 µm, while other species are predominant in particle size range >75 µm. This means that phosphorus removal targeted treatment design should consider both phosphorus speciation as well as particle size.

Impact and interest:

22 citations in Scopus
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17 citations in Web of Science®

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162 since deposited on 27 Mar 2013
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ID Code: 58672
Item Type: Journal Article
Refereed: Yes
Keywords: Nutrients speciation, Nitrogen wash-off, Phosphorus wash-off, Stormwater quality, Stormwater pollutant processes, Stormwater treatment
DOI: 10.1016/j.jenvman.2013.02.027
ISSN: 0301-4797
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Water Quality Engineering (090508)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Journal of Environmental Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Environmental Management, Volume 120 (2013), DOI: 10.1016/j.jenvman.2013.02.027
Deposited On: 27 Mar 2013 01:45
Last Modified: 08 Aug 2014 04:12

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