Nitrate Removal from Groundwater by Purolite A-400 Resin in a Fixed bed Column

Document Type : Research Paper

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Abstract

Appropriate and successful design of an adsorbing column needs to predict dynamic changes in outflow concentration of the substance (i.e. breakthrough curve), which is possible by modeling of the adsorption process. In this study, dynamic experiments were carried out by passing two aqueous solutions of 75 and 150 mg-NO-3 L-1, and a polluted groundwater from Guilan province through a packed bed column of anionic resin, Purolite A-400. Outflow solution was sampled at different time intervals, and the samples were analyzed for nitrate concentration. Dynamic behavior of adsorption was evaluated by modeling of breakthrough curves using Thomas, Bohart-Adams, Lin-Wang and Wolborska models. Comparison and evaluation of the models showed that though the first three models were structurally different and their parameters provided useful information about adsorption process, the data simulated by them were almost the same, and thus parameters of each model could be predicted from the parameters of the two other models without refitting. The predicted curves by the models of Thomas, Bohart-Adams and Lin-Wang were in more agreement with the measured curves than the Wolborska model in all parts of the breakthrough curves, and the dynamic parameters of adsorption process were determined by them more accurately. In the experiment with the polluted groundwater, Thomas model (and other two similar models) deviated from the experimental data at the end of the adsorption process which seemed to be due to the presence of sulfate and phosphate ions in the inflow water. 

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References

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Water and Soil Science
Volume 21, Issue 4 - Serial Number 4
February 2011
Pages 17-34

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