Abstract
Vetiver (Chrysopogonzizanioides) is a perennial bunch grass of the Poaceae family which is popularly known as Kush, and which are suitable for the disposal of leachate and effluents generated from landfill and wastewater treatment with super absorbent characteristics. This experimental study was carried out to assess the efficiency of Vetiver plants in the water of Bagmati River, close to Kirtipur's Laboratory School. Data for design parameters- pH, Temperature, Conductivity, BOD5, Chloride, Nitrate, Phosphate, Hardness and Alkalinity- were collected regularly for a month. Vetiver plants were planted in three buckets with 7.5 liters of sampled water, while another bucket was kept as a control. In each of the three buckets, nine Vetiver plants were planted and physico-chemical parameters analyzed for one month at ten-day intervals. The result showed that on the one month, the overall concentration of BOD5, Chloride, Nitrate, Phosphate, Hardness and Alkalinity reduced by 71.03%, 42.90%, 93.93%, 88.4%, 46.4% and 22.2% respectively. pH and temperature of wastewater showed slight change while electronic conductivity lowered to normal levels after treatment in the bucket. Vetiver plant seems very effective in treating polluted water having high phosphate and nitrate levels.
Highlights
Water is one of the most important natural resources, and without which, life is impossible
The wastewater showed slight change in the parameters like pH, whereas electronic conductivity was decreased to normal level after treatment as compared between untreated wastewater and treated water
The pH values of the water sample during the experiment were within the acceptable limit
Summary
Water is one of the most important natural resources, and without which, life is impossible. 70% of worldwide fresh water resources are used in agriculture and water comprises roughly 70% of the human body. In the history of our planet, water has played a crucial role in the emergence of life some 3.5 billion years ago, and in the birth of the first great civilization that has been developed in the major river basins of the world like Egypt, India, China, Mesopotamia, between 3000 and 1500 BC (Stikker [1], 1998). Nepal is the richest country in water resources in Asia and second richest country in the world after Brazil with respect to the water resource. The major rivers of Nepal are Mechi, Koshi, Bagmati, Karnali, Narayani, Gandaki and Mahakali
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