COMPLETE REMOVAL OF CARCINOGENIC SYNTHETIC DYES IN TEXTILE DYEING EFFLUENTS BY LIQUID-LIQUID EXTRACTION WITH SURFACTANTD.R. MANIMARAN, P. RAMALINGAM, V. ASWINI AND M. SUGANTHYAbstract Solvent extraction proposed for the removal of synthetic dye basic meganta from their aqueous solutions along with the cationic surfactant cetyltrimethyl ammonium bromide (CTAB). Iso-amyl alcohol, n-butyl alcohol, and iso-butyl alcohol were used to extract the dyes from textile dyeing effluents. The main aim of the present investigation is to use the minimum quantity of solvent and surfactant to extract maximum percent of dyes from dyeing effluents. Among the solvents tested, iso-amyl alcohol showed maximum extraction (97%) of dyes. Extraction parameters such as pH, temperature, time, aqueous to solvent ratio, surfactant dose, and dye concentration were tested to obtain maximum dye extraction. Extraction parameters were also determined by using response surface methodology (RSM). Scale-up studies were also carried out for textile dyeing effluents using iso-amyl alcohol and CTAB. Results indicated that liquid-liquid extraction can be scaled-up suitably and can be used in textile dyeing industries to extract the carcinogenic dyes in textile dyeing effluents.
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