ORIGINAL RESEARCH
A Comparison between Kaolin, Montmorillonite
fe-Modified Montmorillonite as Candidate
of Upflow Column Media Filter for Humic
Acid Removal from SSAS
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Environmental Engineering Department, Faculty of Engineering, Zagazig University, Postal code 44519, Egypt
Submission date: 2020-07-30
Final revision date: 2020-10-24
Acceptance date: 2020-11-04
Online publication date: 2021-02-24
Publication date: 2021-04-16
Corresponding author
Ghada El Sayed Heikal
environmental engineering, Faculty of engineering-Zagazig university, Faculture of engineering-Zagazig university -zagaz, 44519, Zagazig, Egypt
Pol. J. Environ. Stud. 2021;30(3):2553-2560
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ABSTRACT
Humic acid (HA)-clay convoluted are well identified for their contribution to environmental
processes. Upflow column filter experiments were performed in this study to scrutinize humic acid in
simulated synthetic aqueous solution (SSAS) removal using kaolin, montmorillonite and fe-modified
montmorillonite under different experimental conditions. The results showed that humic acid removal
was higher in fe-modified montmorillonite clay than in kaolin and montmorillonite clays at optimum
experimental conditions. The results show that the optimum removal efficiency of HA using femodified
montmorillonite was 99 % for humic acid from simulated synthetic aqueous solution (SSAS)
when pH = 1, flow rate = 15 ml/min, retention time = 90 min and initial HA concentration = 1 ppm.
This efficiency was decreased with increasing of pH, flow rate and initial humic acid concentration
while the removal efficiency increased with increasing retention time. This indicates that humic acid
removal can be enhanced through the surface charge modification of montmorillonite, by replacing the
natural interlayer cations of montmorillonite with polymeric Fe species, the properties of clay surfaces
can be modified, and this allows them to interact with both organic and inorganic pollutants dissolved in
water. The results of reusability of fe-modified montmorillonite clay obtained that only a slight loss in
% HA removal efficiency was observed after five cycles of consecutive reusability, demonstrating that
fe-modified montmorillonite was high-performance recyclable filter media for the removal of HA.
Results of the experimental data show that the best empirical correlation achieved the most fitting
of predicted % removal of HA from (SSAS) using fe-modified montmorillonite clay that gives the
maximum value of (R2 = 0.9998). Fe-modified montmorillonite is potential efficient filter media to be
used as possible future promising development in filtration field.