PHYTOREMEDIATION OF HEAVY METALS BY SELECTED HYDROPHYTESAPARNA SREEKUMAR AND JOSE JOHNAbstract The fresh water resource is facing serious threat from different sources of pollution. Many researchers have established that one of the most efficient and cost effective way to combat water pollution is Phytoremediation. One of the objectives of the study is to assess the status of water quality at the point source where effluent is discharged in Periyar river. The study also aims to examine the efficiency of Eichhornia, Salvinia, Lemna and Pistia to remove nitrate, Phosphate and heavy metals such as Zinc and Cadmium. It is found that at the point source where the effluent is discharged (downstream), water is more polluted compared to Upstream. The study confirmed the efficiency of Eichhornia, Salvinia, Pistia and Lemna to remove nitrate, phosphate and heavy metals such as cadmium and zinc. The study revealed that the BCF value of Pistia is higher than Eichhornia with respect to zinc. However the Percentage efficiency of Eichhornia is greater than Pistia. Higher BCF value for Salvinia indicates that it is a better hyper accumulator of Zinc compared to Lemna. It is found that in this case the percentage efficiency is in conformity with the BCF value.
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