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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 4, 2014, pp. 1311-1320
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Bioline Code: st15121
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 4, 2014, pp. 1311-1320
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Nitrate removal using Purolite A520E ion exchange resin: batch and fixed-bed column adsorption modelling
Nur, T.; Shim, W.G.; Loganathan, P.; Vigneswaran, S. & Kandasamy, J.
Abstract
Removing excessive nitrate from water is
essential because it causes eutrophication which in turn has
a harmful effect on aquatic life, resulting in a reduction in
biodiversity and posing a danger to people’s health when
the water is used for drinking. In this study, nitrate removal
from aqueous solutions was studied using an ion exchange
resin (Purolite A520E) in batch and fixed-bed column
experiments. Batch adsorption kinetics was very well
described by pseudo-first-order, pseudo-second-order and
homogeneous surface diffusion models for resin doses
1.5 and 3.0 g/L at a nitrate concentration 20 mg N/L.
Column kinetic data satisfactorily fitted to the empirical
Thomas model and a numerical model based on advection–
dispersion equation for filtration velocities 2.5 and 5.0 m/h
at a column height of 12 cm and inlet concentration
20 mg N/L. The experimental and Thomas model predicted
breakthrough adsorption capacity ranges for the two
filtration rates were 12.0–13.5 and 8.2–9.7 mg N/g,
respectively, whereas the maximum adsorption capacity
determined using Langmuir adsorption isotherm model in
the batch study was 32.2 mg N/g.
Keywords
Adsorption models; Ion exchange resin; Fixed-bed column; Breakthrough curve; Advection– dispersion equation; Purolite A520E
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