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Removal mechanisms and efficiencies of selected heavy metals in constructed wetlands
conference contribution
posted on 2018-02-12, 15:08 authored by M.W. Jayaweera, A.P. Kasige, R.K. Kularatne, S.L. WijeyekoonThe removal efficiencies and mechanisms of Pb, Cr, Cd and Zn removal were investigated in batch type constructed wetlands
comprising water hyacinth (Eichhornia crassipes (Mart.) Solms) using a mass balance analysis. This study was conducted
for 15 weeks in four 590 l capacity tanks containing 3.1, 5, 0.2 and 1.1 mg/l of Pb, Cr, Cd and Zn respectively. Removal
efficiencies from the wastewaters were in the range of 92.1-99.6%, 31.3-100%, 46.3-94.4% and 25.1-94.8% for Pb, Cr, Cd
and Zn, respectively. The results showed that water hyacinth roots play a crucial role in the removal of Pb and Cr by means
of precipitation, though phytoremediation was insignificant. However, phytoremediation through rhizofiltration seemed to
govern the removal of Cd and Zn. We conclude that constructed wetlands comprising water hyacinth is a promising low
cost option for removing the above heavy metals within the ranges investigated.
History
School
- Architecture, Building and Civil Engineering
Research Unit
- Water, Engineering and Development Centre (WEDC)
Published in
WEDC ConferenceCitation
JAYAWEERA, M.W. ... et al, 2006. Removal mechanisms and efficiencies of selected heavy metals in constructed wetlands. IN: Fisher, J. (ed). Sustainable development of water resources, water supply and environmental sanitation: Proceedings of the 32nd WEDC International Conference, Colombo, Sri Lanka, 13-17 November 2006, pp. 112-118.Publisher
© WEDC, Loughborough UniversityVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2006Notes
This is a conference paper.Other identifier
WEDC_ID:10954Language
- en
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