Rapid small scale column tests for Cr(VI) removal by granular magnetite
This study evaluates the possibility to apply magnetite as an adsorbent for the removal of Cr(VI) in a bed column setup under continuous flow conditions. On this purpose, granular magnetite was synthesized at a large-scale and tested in both batch and rapid small-scale column experiments using reliable conditions of drinking water treatment. Column tests, which were designed to scale-down larger adsorption systems in terms of size, time and water flow, indicate a higher removal capacity compared to that observed during batch experiments in magnetite powder, reaching 9.2 mg/g at pH 6.4 before residual Cr(VI) overcomes 10 μg/L. The main parameters of this process, including pH, contact time and granular size, were also examined under similar column tests suggesting the improvement of the overall effectiveness and operation time at lower water pH, higher empty bed contact times and larger particle dimensions.
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Πολυτεχνική Σχολή, Τμήμα Χημικών Μηχανικών
Water Science & Technology, vol.16 no.2  p.525-532
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