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Fixed‐bed study of ammonia removal from aqueous solutions using natural zeolite

Fixed‐bed study of ammonia removal from aqueous solutions using natural zeolite Purpose – The purpose of this paper is to investigate the performance of natural Jordanian zeolite tuff to remove ammonia from aqueous solutions using a laboratory batch method and fixed‐bed column apparatus. Equilibrium data were fitted to Langmuir and Freundlich models. Design/methodology/approach – Column experiments were conducted in packed bed column. The used apparatus consisted of a bench‐mounted glass column of 2.5 cm inside diameter and 100 cm height (column volume = 490 cm 3 ). The column was packed with a certain amount of zeolite to give the desired bed height. The feeding solution was supplied from a 30 liter plastic container at the beginning of each experiment and fed to the column down‐flow through a glass flow meter having a working range of 10‐280ml/min. Findings – Ammonium ion exchange by natural Jordanian zeolite data were fitted by Langmuir and Freundlich isotherms. Continuous sorption of ammonium ions by natural Jordanian zeolite tuff has proven to be effective in decreasing concentrations ranging from 15‐50 mg NH 4 ‐N/L down to levels below 1 mg/l. Breakthrough time increased by increasing the bed depth as well as decreasing zeolite particle size, solution flow‐rate, initial NH 4 + concentration and pH. Sorption of ammonium by the zeolite under the tested conditions gave the sorption capacity of 28 mg NH 4 ‐N/L at 20°C, and 32 mg NH 4 ‐N/L at 30°C. Originality/value – This research investigates the performance of natural Jordanian zeolite tuff to remove ammonia from aqueous solutions using a laboratory batch method and fixed‐bed column apparatus. The equilibrium data of the sorption of Ammonia were plotted by using the Langmuir and Freundlich isotherms, then the experimental data were compared to the predictions of the above equilibrium isotherm models. It is clear that the NH 4 + ion exchange data fitted better with Langmuir isotherm than with Freundlich model and gave an adequate correlation coefficient value. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png World Journal of Science, Technology and Sustainable Development Emerald Publishing

Fixed‐bed study of ammonia removal from aqueous solutions using natural zeolite

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Publisher
Emerald Publishing
Copyright
Copyright © 2014 Emerald Group Publishing Limited. All rights reserved.
ISSN
2042-5945
DOI
10.1108/WJSTSD-05-2013-0022
Publisher site
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Abstract

Purpose – The purpose of this paper is to investigate the performance of natural Jordanian zeolite tuff to remove ammonia from aqueous solutions using a laboratory batch method and fixed‐bed column apparatus. Equilibrium data were fitted to Langmuir and Freundlich models. Design/methodology/approach – Column experiments were conducted in packed bed column. The used apparatus consisted of a bench‐mounted glass column of 2.5 cm inside diameter and 100 cm height (column volume = 490 cm 3 ). The column was packed with a certain amount of zeolite to give the desired bed height. The feeding solution was supplied from a 30 liter plastic container at the beginning of each experiment and fed to the column down‐flow through a glass flow meter having a working range of 10‐280ml/min. Findings – Ammonium ion exchange by natural Jordanian zeolite data were fitted by Langmuir and Freundlich isotherms. Continuous sorption of ammonium ions by natural Jordanian zeolite tuff has proven to be effective in decreasing concentrations ranging from 15‐50 mg NH 4 ‐N/L down to levels below 1 mg/l. Breakthrough time increased by increasing the bed depth as well as decreasing zeolite particle size, solution flow‐rate, initial NH 4 + concentration and pH. Sorption of ammonium by the zeolite under the tested conditions gave the sorption capacity of 28 mg NH 4 ‐N/L at 20°C, and 32 mg NH 4 ‐N/L at 30°C. Originality/value – This research investigates the performance of natural Jordanian zeolite tuff to remove ammonia from aqueous solutions using a laboratory batch method and fixed‐bed column apparatus. The equilibrium data of the sorption of Ammonia were plotted by using the Langmuir and Freundlich isotherms, then the experimental data were compared to the predictions of the above equilibrium isotherm models. It is clear that the NH 4 + ion exchange data fitted better with Langmuir isotherm than with Freundlich model and gave an adequate correlation coefficient value.

Journal

World Journal of Science, Technology and Sustainable Development – Emerald Publishing

Published: May 27, 2014

Keywords: Diffusion; Science; Ammonium removal; Breakthrough curve; Natural zeolite; Isotherm

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