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Removal of Dyes from Wastewater by thermally Treated Rice Husk
By Admin | May 31, 2009
Colored dye waste water arises as results of the production of dye and also as a consequence of its use in textile industry. Most of these dyes are toxic and non biodegradable which impede light penetration and cause numerous problems in several ways. Among decolorisation processes, adsorption technology is considered to be the most effective and proven technology having wide potential applications in both water and wastewater treatment. Commercially available adsorbents are quite expensive so there is a need for low cost and readily available material for adsorption of dyes from waste water. Certain waste products from industrial and agricultural operations and natural materials represent potentially economical alternative sorbents. Many of them have been tested and proposed for dye removal.
Possibility of using rice husk available in Sri Lanka as an adsorbent for removal of colour in textile effluents is explored in this study. The abundance and availability of rice husk make them good sources of raw materials for an adsorbent for activated carbon. Due to their low cost, after these materials have been expended, they can be disposed of without expensive regeneration.
Adsorption of Malachite green and Nylosan blue dyes onto thermally activated rice husk (TARH) and commercial granular activated carbon (GAC) were studied. The optimum Carbonization temperature was 700?C in order to obtain adsorption capacity that was comparable to GAC. Adsorption capacities of Malachite Green and Nylosan blue at an adsorbent dose of 4 g/L for 30 mg/L solution concentrations were 7.3 and 6 mg/g for TARH and 7.5 and 6.5 mg/g for GAC respectively. The maximum removal of 97% and 81% were obtained for Malachite green and Nylosan blue by TARH for at above conditions. The adsorption kinetics of both dyes on to TARH followed second order kinetic model. Equilibrium data were satisfactorily fitted to Langmuir and Freundlich isotherms.
Keywords: Adsorption, Dye Removal, Rice husk carbon, Isotherm, Kinetics
G.K. Jayatunga, B.M.W.P.K. Amarasinghe
Department of Chemical and Process Engineering
University of Moratuwa, Sri Lanka
Topics: symposium2008 | 1 Comment »
June 1st, 2009 at 4:17 pm
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