Volume 3, Number 1 (3 2010)                   ijhe 2010, 3(1): 93-102 | Back to browse issues page

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Asilian H, Moussavi G, Mahmoudi M. Adsorption of Reactive Red 198 Azo Dye fromAqueous Solution onto theWaste Coagulation Sludge of theWater Treatment Plants. ijhe. 2010; 3 (1) :93-102
URL: http://ijhe.tums.ac.ir/article-1-139-en.html

Abstract:   (10282 Views)

Backgrounds and Objectives:Much attention has been recently paid on using waste materials as adsorbents for removal of contaminants from water and wastewater. A new low cost waste was examined for its capacity to adsorb RR198, an azo reactive model dye, from an aqueous solution.
Materials andMethods: The waste was dried, powdered and characterized before being used as an adsorbent. The effects of pH (3-10), adsorbent dose (0.2-3 g), dye concentration and contact time on the adsorption efficiency were investigated. Equilibrium study data were modeled using Langmuir and Freundlich models.
Results: The characterization analysis indicated that itwas composedmainly of ferric hydroxide. The powder had a BET and average pore size of 107 m2/g and 4.5 nm, respectively. The results showed that dye removal was highest at a solution pH of 7 to 8 and a powder dose of 2 g/L. The RR198 removal percentage decreased from 100& to 43& at 140 min contact time when the concentration of dye was increased from 25 mg/L to 100 mg/L, at optimum pH and dosage. The Langmuir equation provided the best fit for the experimental data. The maximum adsorption capacity was calculated to be 34.4 mg/g.
Conclusion: According to the obtained results, the water coagulation waste sludge appears to be a suitable low cost and effcient adsorbent for removing reactive azo dyes from waste streams.

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Type of Study: Research | Subject: General
Received: 2009/11/2 | Accepted: 2010/01/9 | Published: 2013/07/7

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