Efficiency of Manganese Removal by Eichhornia crassipes and Pistia stratiotes from Contaminanted Water
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Date
2019-02
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Uva Wellassa University of Sri Lanka
Abstract
Metal pollution is a major problem of water sources used for drinking purposes. Among heavy metals, Manganese (Mn) is an essential trace element for the functioning of human, animal and plants but it leads to toxicity when it exceeds the standard level. Phytoremediation can be applied to remove heavy metals from aquatic environment. Floating aquatic macrophytes are used as an environmental friendly, efficient and cheap method. In presence study two aquatic plant species, Eichhornia crassipes (Water Hyacinth) and Pistia stratiotes (Water Lettuce) were used to determine the efficiency of removing Manganese. Bioassays using Water Hyacinth and Water Lettuce were carried out with de-ionized water contaminated by three concentration series (20, 40, 60 mg L-1) of Manganese (Π) for a period of 24 days. Three replicates were carried out for each series. Water samples were taken from each series at one day intervals and remaining manganese were analyzed using Atomic Absorption Spectrometry technique. Variations of pH and electrical conductivity of water were also measured as same interval by standard techniques. Data were statistically analyzed using SPSS16.0 package. Both Eichhornia crassipes and Pistia stratiotes showed the highest removal efficiency at the lowest concentration of Manganese (20 mg L-1). Average efficiency of manganese removal from water by Eichhornia crassipes and Pistia stratiotes were 67.61% and 80.04% respectively. Higher manganese removal efficiency was observed in Pistia stratiotes than Eichhornia crassipes. There was a significant difference (p<0.05) between absorbed manganese concentrations with the time in Eichhornia crassipes, but there was no significant difference (p>0.05) in Pistia stratiotes. The results of the study revealed that the both plants can be used to remove manganese from contaminated water. However, it is needed to conduct a pilot study for the water contaminated with manganese.
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Bioprocess Technology, Biotechnology, Bio Chemicals Engineering