Feasibility analysis of As(III) removal in a continuous flow fixed bed system by modified calcined bauxite (MCB)

This study examine the feasibility of As(III) removal from aqueous environment by an adsorbent, modified calcined bauxite (MCB) in a continuous flow fixed bed system. MCB exhibited excellent adsorption capacity of 520.2 mg/L (0.39 mg/g) with an adsorption rate constant 0.7658 L/mg h for an influent...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-01, Vol.139 (2), p.286-292
Main Authors: Bhakat, P.B., Gupta, A.K., Ayoob, S.
Format: Article
Language:English
Subjects:
Absorption
Adsorption
Aluminum Oxide - chemistry
Applied sciences
Arsenic - isolation & purification
Arsenite
BDST model
Breakthrough curve
Chemical engineering
Column studies
Exact sciences and technology
Pollution
Reactors
Water Pollutants, Chemical
Water Purification - methods
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Summary:This study examine the feasibility of As(III) removal from aqueous environment by an adsorbent, modified calcined bauxite (MCB) in a continuous flow fixed bed system. MCB exhibited excellent adsorption capacity of 520.2 mg/L (0.39 mg/g) with an adsorption rate constant 0.7658 L/mg h for an influent As(III) concentration of 1 mg/L. In a 2 cm diameter continuous flow fixed MCB bed, a depth of only 1.765 cm was found necessary to produce effluent As(III) concentration of 0.01 mg/L, from an influent of 1 mg/L at a flow rate of 8 mL/min. Also, bed heights of 10, 20, and 30 cm could treat 427.85, 473.88 and 489.17 bed volumes of water, respectively, to breakthrough. A reduction in adsorption capacity of MCB was observed with increase in flow rates. The theoretical service times evaluated from bed depth service time (BDST) approach for different flow rates and influent As(III) concentrations had shown good correlation with the corresponding experimental values. The theoretical breakthrough curve developed from constantly mixed batch reactor (CMBR) isotherm data also correlated well with experimental breakthrough curve.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.06.037