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J Environ Sci Health A Tox Hazard Subst Environ Eng. 2016 Oct 14;51(12):1068-1074. Epub 2016 Jul 13.

CR-100 synthetic zeolite adsorption characteristics toward Northern Banat groundwater ammonia.

Author information

1
a Institute for Work Safety , Novi Sad , Školska , Serbia.
2
b Envirotech , Kikinda , Sterije Popovića , Serbia.
3
c Faculty of Technology and Metallurgy , Belgrade , Karnegijeva , Serbia.
4
d Faculty of Technology , Novi Sad , Serbia.

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%.

KEYWORDS:

Synthetic zeolite; adsorption isotherms; ammonia; groundwater

PMID:
27409328
DOI:
10.1080/10934529.2016.1198629
[Indexed for MEDLINE]

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