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Removal of Azo Dyes from Water by Adsorption Using Waste Residue From Alum Manufacturing Process

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dc.contributor.advisor Zewge, Feleke (PhD)
dc.contributor.author Habte, Haimanot
dc.date.accessioned 2018-07-03T08:24:53Z
dc.date.available 2018-07-03T08:24:53Z
dc.date.issued 2007-07
dc.identifier.uri http://etd.aau.edu.et/handle/123456789/5791
dc.description.abstract Huge consumption of water and low biodegradability of textile dye wastes calls for a combination of biological, chemical, physico-chemical and physical processes along with a complementary treatment process to remove more of the dyes. Persistent aromatic structure and recalcitrant nature of various dyes and textile chemicals makes the biological treatment not always successful in the treatment of cotton textile wastewater. Chemical methods also have limitations. No universally accepted and efficient method is yet developed for dye removal. In the present study water-soluble reactive azo dyes , fast red RC salt and solar yellow BG were removed from water using locally available industrial by product, a waste residue generated from the manufacture of alum from kaolin by the sulfuric acid process. Batch experiments are carried out for the sorption of fast red salt RC and solar yellow BG onto the adsorbent. The operating variables studied for that of FR-RC salt are adsorbent dose, contact time, system pH, initial dye concentration, and kinetics and adsorption isotherms. And for SY-BG the operating variables studied are adsorbent dose and contact time. The mechanism of dye adsorption for FR-RC salt onto the media is investigated by using the experimental results. The adsorption process is slow for FR-RC salt; requiring 30 hours to reach equilibrium and an adsorbent dose of 19g/L is optimum for this equilibrium contact time for 77.4 % removal efficiency. For SY-BG the equilibrium contact time and optimum dose are 12 minutes and 0.3g/L respectively for 99.3 removal efficiency. When the pH of the system is 7to9 the dye removal efficiency for FR-RC salt is greater than 90%. For the given concentration range the removal of dye from water was not depend on initial dye concentration for FR-RC salt. The adsorption process was found to undergo via a pseudo-second-order adsorption kinetics with a rate constant of 3.81X10-3(g mg-1min-1). The equilibrium data are fitted to Freundlich isotherm equations for that of FR-RC salt. From these the adsorption efficiency, adsorption capacity and intensity of adsorption are calculated. The overall result shows the adsorbent is efficient decolorizing material. Key Words: Textile dye, Batch decolorization, an industrial by product; Dye removal efficiency, Adsorption capacity, equilibrium time. en_US
dc.language.iso en en_US
dc.publisher Addis Ababa University en_US
dc.subject Textile Dye en_US
dc.subject Batch Decolorization en_US
dc.subject an Industrial by Product en_US
dc.subject Dye Removal en_US
dc.subject Efficiency en_US
dc.subject Adsorption Capacity en_US
dc.subject Equilibrium Time en_US
dc.title Removal of Azo Dyes from Water by Adsorption Using Waste Residue From Alum Manufacturing Process en_US
dc.type Thesis en_US

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