The Influence of Chemical Modification on the Co2+ Ion Sorption Process by Anaerobic Sludge
Vladimír Frišták, Michaela Valovčiaková, Martin Pipíška, Juraj Lesný
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Department of Ecochemistry and Radioecology, Faculty of Natural Sciences,
University of SS. Cyril and Methodius in Trnava,
Nám. J. Herdu 2, SK-917 01, Trnava, Slovak Republic
Pol. J. Environ. Stud. 2014;23(3):705–712
Modification by chemical agents affected the sorption capacities of sludge from municipal wastewater treatment plants (WWTPs). We tried to characterize changes in sorption capacity of dried anaerobic sludge (DANS) after chemical modification by formaldehyde, methanol, and hydrochloric acid. Modified sludges were characterized by FT-IR spectroscopy, cation exchange capacity, and electrothermal atomic absorption spectrometry (ETAAS) analysis. Maximum sorption capacities Qmax at pH 6.0 for Co2+ ions calculated from Langmuir isotherm model were 175±5 μmol/g for unmodified DANS, 170±2 μmol/g for CH2O-modified DANS, 12±0.2 μmol/g for CH3OH-modified DANS, and 15±0.3 μmol/g for HCl-modified DANS. Our paper established the crucial role of carboxyl functional groups against amino and hydroxyl groups in sorption process of cobalt ions.