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Removal of Nitrates from Polluted Waters Using Bio-Adsorbents

M Suneetha and K Ravindhranath
Department of Engineering, Chemistry and Post Graduate Chemistry, Bapatla Engineering College, Bapatla-422101, Guntur Dt., Andhra Pradesh
Abstract—The sorption characteristics of bio-adsorbents derived from Annona squmosa, Calotropis zygantia and Tridox procumbens in extracting Nitrate from polluted waters were explored. At low pH values, these sorbents showed sensitivity towards Nitrates. The physicochemical parameters such as pH, time of equilibration and sorbent concentrations were optimized. Successful methodologies have been developed to extract good quantities of nitrates. % of extraction with stem powders was found to be more than the respective leaf powders. Fivefold excess of common cations present in waters, have synergistic effect on the % of extraction while other common anions, except sulphate, have marginal effect. The procedures developed were found to be remarkably successful when applied to some real samples of industrial effluents and polluted lakes. 

Index Terms—nitrates, pollution control, bio-adsorbents

Cite: M Suneetha and K Ravindhranath, "Removal of Nitrates from Polluted Waters Using Bio-Adsorbents," International Journal of Life Sciences Biotechnology and Pharma Research, Vol. 1, No. 3, pp. 151-160, July 2012.
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