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Constructed wetlands: Treatment of concentrated storm water runoff (part A)

Lee, B, Scholz, M and Horn, A 2006, 'Constructed wetlands: Treatment of concentrated storm water runoff (part A)' , Environmental Engineering Science, 23 (2) , pp. 320-331.

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The aim of this research was to assess the treatment efficiencies for gully pot liquor of experimental vertical- flow constructed wetland filters containing Phragmites australis (Cav.) Trin. ex Steud. (common reed) and filter media of different adsorption capacities. Six out of 12 filters received inflow water spiked with metals. For 2 years, hydrated nickel and copper nitrate were added to sieved gully pot liquor to simulate contaminated primary treated storm runoff. For those six constructed wetland filters receiving heavy metals, an obvious breakthrough of dissolved nickel was recorded after road salting during the first winter. However, a breakthrough of nickel was not observed, since the inflow pH was raised to eight after the first year of operation. High pH facilitated the formation of particulate metal compounds such as nickel hydroxide. During the second year, reduction efficiencies of heavy metal, 5-days at 20°C N-Allylthiourea biochemical oxygen demand (BOD) and suspended solids (SS) improved considerably. Concentrations of BOD were frequently �20 mg/L. However, concentrations for SS were frequently �30 mg/L. These are the two international thresholds for secondary wastewater treatment. The BOD removal increased over time due to biomass maturation, and the increase of pH. An analysis of the findings with case-based reasoning can be found in the corresponding follow-up paper (Part B).

Item Type: Article
Themes: Subjects outside of the University Themes
Schools: Schools > College of Science & Technology > School of Computing, Science and Engineering > Salford Innovation Research Centre (SIRC)
Journal or Publication Title: Environmental Engineering Science
Publisher: Mary Ann Liebert
Refereed: Yes
ISSN: 1092-8758
Depositing User: Users 29196 not found.
Date Deposited: 21 Mar 2012 14:39
Last Modified: 29 Oct 2015 00:19

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