Int J Phytoremediation
a Department of Biosciences and Bioengineering , Indian Institute of Technology, Guwahati , Assam , India.
Published: November 2017
Discharge of wastewater from electroplating and leather industries is a major concern for the environment due to the presence of toxic Cr and other ions, such as sulfate, nitrate, phosphate, etc. This study evaluated the potential of Tradescantia pallida, a plant species known for its Cr bioaccumulation, for the simultaneous removal of Cr, SO, NO, and PO. The effect of different co-ions on Cr removal by T. pallida was examined following the Plackett-Burman design of experiments carried out under batch hydroponics conditions. The results revealed a maximum removal of 84% Cr, 87% SO, 94% NO and 100% PO without any phytotoxic effect on the plant for an initial Cr concentration in the range 5-20 mg L. SO and NO enhanced Cr uptake at a high initial Cr concentration (20 mg L), whereas PO did not affect Cr uptake both at high and low initial Cr concentrations. The Cr removal kinetics in the presence of different ions was well described by the pseudo-second-order kinetic model which revealed that both biosorption and bioaccumulation of the metal played an important role in Cr removal. Increase in the total carbohydrate and protein content of the plant following Cr and co-ions exposure indicated a good tolerance of the plant toward Cr toxicity. Furthermore, enhancement in the lipid peroxidation and catalase activity in T. pallida upon Cr exposure revealed a maximum stress-induced condition in the plant. Overall, this study demonstrated a very good potential of the plant T. pallida for Cr removal from wastewater even in the presence of co-ions.
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http://dx.doi.org/10.1080/15226514.2017.1319323 | DOI Listing |
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