METHODOLOGY FOR EVALUATING THE EFFICIENCY OF NICKEL BIOSORPTION BY Chlorella vulgaris IN PHYCOREACTORS

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Alexander Pérez Cordero
Donicer E. Montes Vergara
Yelitza Aguas Mendoza

Keywords

nickel, microalgae, removal, suspension, immobilization

Abstract

The aim of the present study was to evaluate the Ni2+ removal capacity of Chlorella vulgaris in solution and immobilized on Luffa cylindrical for 25 days in phyco-reactors and subsequently subjected to concentrations of 0.5, 1.0, 1.5 and 2.0 mg/L NiCl2 for 24 h in constant light. The immobilized microalgae showed high percentages of 98.0 % Ni2+ removal. With respect to the concentrations of nickel, Chlorella vulgaris showed a higher removal at a higher concentration of 2.0 mg/L with 95.8 % removal for nickel, which is possibly due to the fact that the cells of Chlorella vulgaris have a high affinity for divalent Ni2+ metals that interact with the functional groups present in the membrane of the microalgae and act as binding and neutralization points for the toxicity of these pollutants. Therefore, phyco-remediation using immobilized Chlorella vulgaris is a technique with a high capacity for remediation of Ni2+ contaminated waters.

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