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    Coal-based bottom ash (CBBA) waste material as adsorbent for removal of textile dyestuffs from aqueous solution
    (Elsevier, 2007) Dincer, Ali Riza; Gunes, Yalcin; Karakaya, Nusret
    A locally available CBBA waste material was used as adsorbent for removal of reactive dyes from synthetic textile wastewater. This study presents the results of our investigation on color removal from synthetic wastewater containing Vertigo Blue 49 (Cl Blue 49) and Orange DNA 13 (Cl Orange 13) by adsorption onto CBBA waste material. The effectiveness of CBBA waste material in adsorbing reactive dyes from aqueous solutions was studied as a function of contact time, initial dye concentration and pH by batch experiments. Leachability of waste material was also evaluated using standard leaching test with deionized water (DIN38414-S4). pH 7 was more favorable for color removal from both Vertigo Blue 49 (Cl Blue 49) and Orange DNA (Cl Orange 13). Dyestuff adsorption capacities of CBBA for Vertigo Blue 49 and Orange DNA13 were 13.51 and 4.54 mg dye/g adsorbent, respectively. The adsorption isotherms for the CBBA can be better described by the Freundlich isotherm. The results showed that the dyestuff uptake process for both dyes followed the second-order kinetics. The bottom ash used in this study is not classified as ecotoxic/hazardous material according to the French proposal for a criterion and evaluation methods of waste ecotoxicity (CEMWE) and the German regulation on Hazardous Waste Classification (HWC). (c) 2006 Elsevier B.V. All rights reserved.
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    Comparison of activated carbon and bottom ash removal of reactive dye from aqueous solution
    (Elsevier Sci Ltd, 2007) Dincer, Ali Riza; Gunes, Yalcin; Karakaya, Nusret; Gunes, Elcin
    The adsorption of reactive dye from synthetic aqueous solution onto granular activated carbon (GAC) and coal-based bottom ash (CBBA) were studied under the same experimental conditions. As an alternative to GAC CBBA was used as adsorbent for dye removal from aqueous solution. The amount of Vertigo Navy Marine (VNM) adsorbed onto CBBA was lower compared with GAC at equilibrium and dye adsorption capacity increased from 0.71 to 3.82 mg g(-1), and 0.73 to 6.35 mg g(-1) with the initial concentration of dye from 25 to 300 mg l(-1) respectively. The initial dye uptake of CBBA was not so rapid as in the case of GAC and the dye uptake was slow and gradually attained equilibrium. (c) 2006 Elsevier Ltd. All rights reserved.