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Phytoremediation Potential of Vetiver Grass (Chrysopogon zizanioides) for Treatment of Water from Bagmati River, Nepal
Alina Maharjan

Last modified: 2017-08-29


Phytoremediation is an emerging green clean-up technology that uses plant's potentials to remediate soil and water pollutants. Among the different plants species evaluated to treat wastewater, Vetiver (Chrysopogon zizanioides) grass of the Poaceae family has been reported to perform well with having super-absorbent characteristics. However, such studies in the Nepalese context seem very scanty. Therefore, the present research was carried out to assess the efficiency of Vetiver grass in removing pollutants from Bagmati River water under hydroponic condition. The field experiment was conducted in two liters PET bottles filled-up with river water in different dilutions (undiluted river water, 3 river water: 1 distilled water, 2 river water: 2 distilled water and 1 river water: 3 distilled water) with and without Vetiver grass (control). The morphological changes in plants and selected physico-chemical parameters and faecal coliform of water samples were analyzed up to 60 days. The result showed that the Vetiver grass survived well in all the dilutions. In 3:1 and 2:2 dilutions, the height growth of Vetiver grass was relatively high. Moreover, the result showed growth of Vetiver grass was effective in decreasing turbidity, TDS, EC, Cl, hardness, total phosphorus, nitrate and COD. Along with reduction in physico-chemical parameter, the growth (height) of Vetiver grass showed significant reduction in faecal coliform count. The present study has shown phytoremediation potential of Vetiver in treating polluted river water. However, further works need to be carried out to optimize the performance in combination with other plants.

Keywords: Bagmati, Chrysopogon zizanioides, Hydroponic, Phytoremediation, Water Quality

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