Modeling and fixed bed column adsorption of As(III) on laterite soil

The performance of a fixed bed column for the removal of As(III) from aquatic environment was studied. Laterite soil was used as the adsorbent material. The column with 2-cm diameter, different bed heights such as 10 cm, 20 cm and 30 cm could treat 1.3 l, 7.9 l and 14.88 l, respectively, of As(III)...

Full description

Saved in:
Bibliographic Details
Published inSeparation and purification technology Vol. 56; no. 3; pp. 284 - 290
Main Authors Maji, Sanjoy Kumar, Pal, Anjali, Pal, Tarasankar, Adak, Asok
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.09.2007
Elsevier Science
Subjects
Adsorption
Applied sciences
As(III) adsorption
BDST model
Breakthrough curve
Chemical engineering
Column study
Exact sciences and technology
Laterite soil
Column study
Laterite soil
BDST model
As(III) adsorption
Breakthrough curve
Process dynamics
Saturation
Adsorption isotherm
Adsorption capacity
Modeling
Design
Sorption
Aquatic environment
Adsorption
Kinetics
Rate constant
Fixed bed
Online AccessGet full text

Cover

More Information
Summary:The performance of a fixed bed column for the removal of As(III) from aquatic environment was studied. Laterite soil was used as the adsorbent material. The column with 2-cm diameter, different bed heights such as 10 cm, 20 cm and 30 cm could treat 1.3 l, 7.9 l and 14.88 l, respectively, of As(III) bearing (conc. 0.5 mg/l) water at a flow rate of 7.75 ml/min. Bohart and Adams sorption model was employed for the determination of different parameters like height of exchange zone, adsorption rate, time required for exchange zone to move, and the adsorption capacity. Effect of flow rate and initial concentration was studied. The adsorption capacity and the adsorption rate constant of the adsorbent laterite soil for 0.5 mg/l of As(III) were found to be 108.02 mg/l and 0.6523 l/(mg h), respectively. The column was designed by the bed depth service time (BDST) model. Column design parameters were also tested with varying flow rate and initial As(III) concentration of the influent. Freundlich isotherm model was used to compare the theoretical and experimental breakthrough profile in the dynamic process. The bed saturation obtained was 53–71%. Regeneration of the exhausted column was possible with 1 M NaOH.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2007.02.011