In South Sweden, free water surface wetlands have been built to treat wastewater from municipal wastewater treatment plants. Commonly, nitrogen removal has been the prime aim, though a significant removal of tot-P and BOD7 has been observed. In this study, performance data for 3–8 years from four large (20–28 ha) FWS wetlands have been evaluated. Two of them receive effluent from WWTP with only mechanical and chemical treatment. At the other two, the wastewater has also been treated biologically resulting in lower concentrations of BOD7 and NH4+-N. The wetlands performed satisfactorily and removed 0.7–1.5 ton N ha−1 yr−1 as an average for the time period investigated, with loads between 1.7 and 6.3 ton N ha−1 yr−1. Treatment capacity depended on the pre-treatment of the water, as reflected in the k20-values for N removal (first order area based model). In the wetlands with no biological pre-treatment, the k20-values were 0.61 and 1.1 m month−1, whereas for the other two they were 1.7 and 2.5 m month−1. P removal varied between 10 and 41 kg ha−1 yr−1, and was related to differences in loads, P speciation and to the internal cycling of P in the wetlands.
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Research Article|
May 01 2005
Free water surface wetlands for wastewater treatment in Sweden: nitrogen and phosphorus removal
J.L. Andersson;
*WRS Uppsala AB, Östra Ågatan 53, SE-753 22 Uppsala, Sweden (E-mail: [email protected])
E-mail: [email protected]
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S. Kallner Bastviken;
S. Kallner Bastviken
**IFM/section Biology, Linköping University, SE-581 83 Linköping, Sweden (E-mail: [email protected], [email protected])
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K.S. Tonderski
K.S. Tonderski
**IFM/section Biology, Linköping University, SE-581 83 Linköping, Sweden (E-mail: [email protected], [email protected])
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Water Sci Technol (2005) 51 (9): 39–46.
Citation
J.L. Andersson, S. Kallner Bastviken, K.S. Tonderski; Free water surface wetlands for wastewater treatment in Sweden: nitrogen and phosphorus removal. Water Sci Technol 1 May 2005; 51 (9): 39–46. doi: https://doi.org/10.2166/wst.2005.0283
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