Elimination of Anionic Dye from Wastewater through Coagulation/Flocculation process
Effluents discharged from various textile industries are responsible for one of the major environmental pollution. Textile wastewater contains a variety of components some of which are exceedingly toxic to the environment. Several wastewater treatment technologies have been used from time to time by the researchers. Coagulation-flocculation has always been proven an effective treatment technology for removing dye pollutants. This research was conducted to study the maximum removal efficiency of the anionic dye from synthetic wastewater for the best coagulant or coagulant-flocculant combination. Comparing the results among the different coagulants and flocculants with same dosages it was observed that at 400 ppm concentration and at pH 7, polyaluminium chloride alone gave the best possible colour removal efficiency of 99.7%. Although both sodium alginate and sodium aluminate showed significantly good results when used as flocculants. Colour removal efficiency was also investigated for pH variation. Congo Red being an anionic dye showed maximum colour removal efficiency at acidic to neutral pH i.e., pH 5-7.
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