Removal of fluoride from water by using granular red mud: Batch and column studies
Küçük Resim Yok
Tarih
2009
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
ELSEVIER
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This paper describes the removal of fluoride from water using granular red mud (GRM) according to batch and column adsorption techniques. For the batch technique, the experiments demonstrated that maximum fluoride removal was obtained at a pH of 4.7 and it took 6 h to attain equilibrium and equilibrium time did not depend upon the initial fluoride concentration. Kinetics data were fitted with pseudo-second-order model. The Redlich-Peterson and Freundlich isotherm models better represented the adsorption data in comparison to the Langmuir model. Column experiments were carried out under a constant influent concentration and bed depth, and different flow rates. The capacities of the breakthrough and exhaustion points decreased with increase of the flow rate. Thomas model was applied to the experimental results. The modelled breakthrough curves were obtained, and they were in agreement with the corresponding experimental data. The column adsorption was reversal and the regeneration operation was accomplished by pumping 0.2 M of NaOH through the loaded GRM-column. (C) 2008 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Granular red mud, Fluoride removal, Adsorption
Kaynak
JOURNAL OF HAZARDOUS MATERIALS
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
164
Sayı
1