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The main purpose of this study was to evaluate the capacity of an activated zeolite for ammonium removal in fixed-bed column. The influence of process parameters, such as activated natural zeolite quantity (1 - 6 g) and ammonium initial concentration (10 - 70 mg/L) was investigated. The experimental results were analyzed using the most common sorption kinetic models, such as Thomas, Adam-Bohart, as well Clark, by linear regression analysis in order to characterize the removal process. The obtained values showed th...

Natural zeolites are able to remove lower concentrations of contaminants present in groundwater and drinking water through ion-exchange process. The main objectives of this work were: (1) to determine the efficiency of different types of regenerants: NaOH 0.5 M, NaCl 0.5 M, NaClO 0.5 M and NaClO:NaCl (1:1) 0.5 M; (2) to investigate the effect of initial pH (5.7 - 11.7) and molarity (0.5 - 1 M) of the regenerants; and (3) to determine the removal capacity of natural zeolite for ammonium removal after ten (10) sorpt...