Assessment of rhizofiltration of lead and cadmium using Chrysopogon zizanioides
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Date
2020-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study focused on rhizofiltration potential of Chrysopogon zizanioides for removal of lead and cadmium from synthetic waste water. Accumulation of metals in plant parts and their simultaneous removal from synthetic waste water were analysed. Pb and Cd content in waste water was decreasing with increasing exposure duration of the vetiver. Pb and Cd accumulation in plant was increasing with increasing exposure duration. Higher Pb and Cd removal (i.e. 13.04 ppm and 3.9 ppm respectively) was observed in 50 ppm than 100 ppm concentration of waste water at 5th week. Maximum Pb reduction rate i.e. 0.541 mg/L/day at 5th week was recorded, while Cd reduction rate i.e. 0.186 mg/L/day at 4th week was observed in 50 ppm concentrated waste water. Metal removal efficiency of vetiver grass increased with increasing exposure period. Plant had the highest Pb and Cd removal efficiency i.e. 26.06% and 7.79% respectively at 50 ppm. The plant had higher Pb and Cd accumulation at 50 ppm than 100 ppm of waste water. Maximum Pb and Cd accumulation (i.e. 1.981 mg g-1 and 0.795 mg g-1 respectively) was observed in roots at 50 ppm. However, in shoots maximum Pb and Cd content was (i.e. 0.077 mg g-1 and 0.077 mg g-1) respectively at 50 ppm. Total Pb and Cd accumulation in plant was reached up to 38.48 mg/plant and 9.53 mg/plant at 50 ppm. Dry biomass production of vetiver grass increased with decreasing Pb and Cd concentration in waste water. Result revealed that vetiver plant having good metal removal efficiency could better be employed for decontaminating moderately polluted waste water.