title: CR-100 synthetic zeolite adsorption characteristics toward Northern Banat groundwater ammonia.
abstract: The adsorption characteristics of synthetic zeolite CR-100 in a fixed-bed system using continuous flow of groundwater containing elevated ammonia concentration were examined. The possibilities for adsorbent mass calculation throughout mass transfer zone using novel mathematical approach as well as zeolite adsorption capacity at every sampling point in time or effluent volume were determined. The investigated adsorption process consisted of three clearly separated steps indicated to sorption kinetics. The first step was characterized by decrease and small changes in effluent ammonia concentration vs. experiment time and quantity of adsorbed ammonia per mass unit of zeolite. The consequences of this phenomenon were showed in the plots of the Freundlich and the Langmuir isotherm models through a better linear correlation according as graphical points contingent to the first step were not accounted. The Temkin and the Dubinin-Radushkevich isotherm models showed the opposite tendency with better fitting for overall measurements. According to the obtained isotherms parameter data, the investigated process was found to be multilayer physicochemical adsorption, and also that synthetic zeolite CR-100 is a promising material for removal of ammonia from Northern Banat groundwater with an ammonia removal efficiency of 90%.
authors.affiliation: a Institute for Work Safety , Novi Sad , Školska , Serbia.
authors.forename: Željko
authors.initials: Ž
authors.lastname: Tomić
authors.affiliation: b Envirotech , Kikinda , Sterije Popovića , Serbia.
authors.forename: Miroslav
authors.initials: M
authors.lastname: Kukučka
authors.affiliation: b Envirotech , Kikinda , Sterije Popovića , Serbia.
authors.forename: Nikoleta Kukučka
authors.initials: NK
authors.lastname: Stojanović
authors.affiliation: c Faculty of Technology and Metallurgy , Belgrade , Karnegijeva , Serbia.
authors.forename: Andrej
authors.initials: A
authors.lastname: Kukučka
authors.affiliation: d Faculty of Technology , Novi Sad , Serbia.
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Jokić
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D060587:Groundwater / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D055771:Serbia; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D017641:Zeolites; D000641:Ammonia
keywords: Synthetic zeolite; adsorption isotherms; ammonia; groundwater