Removal of Microcystin-LR from Drinking Water Using a System Involving Oxidation and Adsorption
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Abstract
The aim of the present study was to evaluate the efficiency of removal of microcystin-LR from drinking water using a three-stage bench-scale treatment comprising Fenton oxidation/coagulation/flocculation/sedimentation, filtration through a sand column (15 cm bed), and adsorption onto a granular activated carbon (GAC) column with 15-cm (GAC1) or 20-cm bed (GAC2). Optimal first-stage conditions were determined to be FeSO4∙7H2O 0.054 mM, H2O2 0.162 mM, coagulation pH 8.4, sedimentation time 15 min, and flow rate 2 L h−1. Under these conditions, water turbidity was reduced from 5.8 to 3.0 uT, apparent color from 115 to 81 uH, and the concentration of microcystin-LR from 18.52 to 9.59 μg L−1. Column GAC2 was more efficient than GAC1, as shown by the higher adsorption capacity (4.15 μg g−1) and lower carbon usage rate (1.70 g L−1). Microcystin breakthrough occurred after 2 h of operation with GAC1 column and after 6 h with GAC2 column, and the greater efficiency of the latter column was confirmed by the high qe (4.15 μg g−1) and low CUR (1.70 g L−1) values attained. The results demonstrate that adsorption on a GAC column plays an essential role in reducing the concentration of microcystin-LR to levels compatible with current legislation. By-products of the Fenton oxidation of microcystin-LR were analyzed by mass spectrometry, and the ADDA amino acid present in the analyte was identified from its characteristic fragment at m/z 135. It is concluded that the combination of Fenton oxidation and adsorption on a GAC column represents a viable option for purifying eutrophic water containing high concentrations of microcystin-LR.
Keywords
Water treatment Bloom-forming cyanobacteria Microcystin-LR Fenton oxidation Coagulation Granular activated carbon from palm (dendê) coconut shellsNotes
Acknowledgements
The authors wish to thank the Department of Botany of the Universidade Federal de São Carlos for Cultures of M. aeruginosa and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal Nível Superior (CAPES), and Financiadora de Estudos e Projetos (FINEP) for financial support.
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