Uptake And Leaching Of Heavy Metals From Water Lettuce (Pistia Stratiotes)

Sia, Mee Kee (2007) Uptake And Leaching Of Heavy Metals From Water Lettuce (Pistia Stratiotes). [Final Year Project Report] (Unpublished)

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Abstract

Water Lettuce, or known as Pistia stratiotes is an aquatic macrophytes which is widely used in wastewater treatment process for metals removal. The aim of this study is to determine the metals (lead, cadmium, zinc and copper) removal ability of water lettuce from wastewater and its leaching potential in living and dead plants. Highest percentage removal was observed at the beginning of the Experiment 1 and was gradually decreased along the experiment. Among the four metals, Pb appeared to be the highest removed metals by plants. Average removal of 100 %, 84.64 % and 77.23 % were achieved for Pb concentration of 2 ppm, 4 ppm and 6 ppm, respectively. Living plant possessed leaching potential at the end of the Experiment 2, except for Cd. This was mainly due to the unhealthy state and accumulated toxic effects in plants. Generally, dead plants performed slightly better than living plants at the end of the Experiment 3, where they were still able to uptake the remaining metals in the wastewater. However, there was no significant difference between removal or leaching potential of living and dead plants in Experiment 2 and Experiment 3

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