Removal Of Dyes From Textile Effluents By Coagulation Using Locally Produced Alum

Huge consumption of water and low biodegradability of textile dye wastes calls for arncombination of biological and physico – chemical processes along with a complementaryrntreatment option to remove more of the dyes. Persistent aromatic structure and recalcitrantrnnature of various dyes and textile chemicals makes the biological treatment not alwaysrnsuccessful in the treatment of cotton textile waste water. Physico – chemical methods alsornhave limitations. No universally accepted and efficient method is yet developed for dyernremoval.rnIn this study the dye removal capacity of locally available alum was investigated. The studyrninvolved series of batch coagulation experiments using simulated solution containing textilerndyes to assess the effects of various process parameters including contact time, pH, coagulantrndosage, dye’s initial concentration, and reaction kinetics of coagulation.rnThe result of the study showed that an increase in both coagulant dosage and initialrnconcentration increases the percentage of dye removal. In all cases the optimized percentagernof dye removal is nearly or above 90 %. Most of the reactions are completed in less than 20rnminutes. The effect of pH of the studied dyes demonstrated that the highest percentage of therndye removal was observed at pH =7.45 for I.B, 7.65 for S.O and 9.05 for I.O. The reactionrnkinetics of I.B and I.O was observed to obey pseudo first order kinetics, with rate constantsrnK1 = 0.11131s—1 for I. B and K2 = 0.12264 s-1 for I.O respectively

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