Feasibility analysis of As(III) removal in a continuous flow fixed bed system by modified calcined bauxite (MCB) [An article from: Journal of Hazardous Materials]

This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
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 520.2mg/L (0.39mg/g) with an adsorption rate constant 0.7658L/mgh for an influent As(III) concentration of 1mg/L. In a 2cm diameter continuous flow fixed MCB bed, a depth of only 1.765cm was found necessary to produce effluent As(III) concentration of 0.01mg/L, from an influent of 1mg/L at a flow rate of 8mL/min. Also, bed heights of 10, 20, and 30cm 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.