The results of heavy metals (Fe, Mn, Zn, Ni, Cu, Cr, Pb, Cd) removal and partitioning between aqueous and solid phases at two treatment wetlands (TWs) treating municipal landfill leachates are presented. One of the TWs is a surface flow facility consisting of 10 ponds. The other TW is a newly constructed pilot-scale facility consisting of three beds with alternately vertical and horizontal sub-surface flow. The metals concentrations were analysed in leachate (both TWs) and bottom sediments (surface flow TW). Very high (90.9–99.9%) removal rates of metals were observed in a mature surface flow TW. The effectiveness of metals removal in a newly constructed pilot-scale sub-surface flow wetland were considerably lower (range 0–73%). This is attributed to young age of the TW, different hydraulic conditions (sub-surface flow system with much shorter retention time, unoxic conditions) and presence of metallic complexes with refractory organic matter.
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Research Article|
October 01 2011
Distribution and removal efficiency of heavy metals in two constructed wetlands treating landfill leachate
Ewa Wojciechowska;
1Faculty of Civil & Environmental Engineering, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland
E-mail: esien@pg.gda.pl
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Sylvia Waara
Sylvia Waara
2Wetland Center, School of Business and Engineering, Halmstad University, Box 823, SE301 18 Halmstad, Sweden
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Water Sci Technol (2011) 64 (8): 1597–1606.
Article history
Received:
February 24 2011
Accepted:
May 09 2011
Citation
Ewa Wojciechowska, Sylvia Waara; Distribution and removal efficiency of heavy metals in two constructed wetlands treating landfill leachate. Water Sci Technol 1 October 2011; 64 (8): 1597–1606. doi: https://doi.org/10.2166/wst.2011.680
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