Removal of Color from Aqueous Solutions Containing Textile Dyes by Dolomite Wastes

Document Type : Research Paper

Authors

1 . Former Grad. Student of Environmental Eng., Dept. of Civil Eng., Isfahan University of Tech., Isfahan

2 Prof., Dept. of Civil Eng., Isfahan University of Tech., Isfahan

3 Assoc. Prof., Dept. of Textile Eng., Isfahan University of Tech., Isfahan

Abstract

The wastewaters of textile industries are large in volume and have different qualities. Therefore, their treatment is complicated. The main purpose of this research is to study the performance of dolomite wastes from stone industries, which are usually discharged into environment without being utilized, as an adsorbent for removal of dyes from textile industries wastewater. For this purpose, and because of wide usage of Acidic, Disperse and Reactive dyes in textile industries, color solutions containing C.I.Acid Red 88, C.I.Disperse Red 151 and C.I.Reactive Red 29 were used. For optimizing of different factors which affect the amount of adsorption, four factors of initial dye concentration, initial pH, stirring speed and adsorbent dosage were observed. In order to decrease the number of experiments, for minimizing the time and expenses, Taguchi method is utilized. Dolomite was incinerated at 800°C to increase adsorption capacity. The experiments were performed in batch reactors. In optimum conditions, the maximum color removal efficiencies for Acid Red 88 (initial concentration of 50 mg/L, initial pH of 6, stirring speed of 200 rpm, adsorbent dosage of 8g/L), for Disperse Red 151 (initial concentration of 100 mg/L, initial pH of 4, stirring speed of 200 rpm, adsorbent dosage of 8g/L) and for Reactive Red 29 (initial concentration of 50 mg/L, initial pH of 2, stirring speed of 200 rpm, adsorbent dosage of 6g/L) were more than %99, that shows a high level of color removal performance by this adsorbent. Freundlich isotherm is the best model describing the adsorption process by charred dolomite in equilibrium condition for color removal.

Keywords

References

Wang, C.C., Juang, L.C., Hsu, T.C., Lee, C.K., Lee, J.F., and Huang, F.C. (2004). Adsorption of basic dyes onto montmorillonite. J. Colloid Int.. 273, 80-86 Espantaleon, A.G., Nieto, J.A., Fernandez, M., and Marsal, A. (2003). Use of activated clays in the removal of dyes and surfactants from tannery wastewaters. J. Appl. Clay. 24, 105-110 Harris, R.G., Wells, J.D., and Johnson, B.B. (2001). Selective adsorption of dyes and other organic molecules to kaolinite and oxide surfaces. J. Colloid Surf A: Physicochem. Eng.. 180, 131-140 Adnan Özacan, E., Mine Öncű¨, A., and Safa Özacan. (2005). Kinetics, isotherm and thermodynamic studies of adsorption of Acid Blue 193 from aqueous solutions onto natural sepiolite. J. Colloids and Surfaces A: Physicochem. Eng.. 227, 90-97 Phan, T.N.T., Bacquet, M., and Morcellet, M. (2000). Synthesis and characterization of silica gels functionalized with monochlorotriazinyl beta-cyclodextrin and their sorption capacities towards organic compounds. J. Inclusion Phenom. Macrocyclic Chem.. 38, 345-359 Dogan, M., and Alkan, M. (2003a). Removal of methyl violet from aqueous solution by perlite. J. Colloid Int.. 267, 32-41 Özacar, M., and Sengil, A.I. (2002). Adsorption of acid dyes from aqueous solutions by calcined alunite and granular activated carbon. 8, 301-308 Shaobin, W., Huiting, L., Sujuan, X., Shenglin, L., and Longya, X. (2005). Physical and chemical regeneration of zeolitic adsorbents for dye removal in wastewater treatmen. J. of Chemosphere. 65, 82-87 Staszczuk, P., Stefaniak, E., and Dobrowolski, R. (1997). Characterisation of thermally treated dolomite. J. Powder Technol.. 92 (257) Nunn, D.M. (1979). The dyeing of synthetic polymer and acctate fibers. Dyers Company Pub., Trust, London.. Walker, G.M., Hansen, L., Hanna, J.A., and Allen, S.J. (2003). Kinetics of a reactive dye adsorption onto dolomitic sorbents. J. of Water Research. 37, 2081-2089 Takhtkouseh, A. (2008). Removal of lead from aqueous solutions by dolomit wastes. M.Sc. Thesis, Dept. of Civil Eng., Isfahan University of Tech., Isfahan. Roy, R. K. (2001). Design of experiments using the taguchi approach. John Wiley and Sons, NY. Duffy, A., Walker, G.M., and Allen, S.J. (2006). Investigations on the adsorption of acidic gases using activated dolomite. J. Chemical Engineering. 117, 239-244
Journal of Water and Wastewater; Ab va Fazilab ( in persian )
Volume 22, Issue 4 - Serial Number 4
Serial number:80
January and February 2012
Pages 30-36

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