Decolourization of textile dyebath chloride rich wastewater by electrolytic processes

Abstract

The potential of electrolytic process was studied for the treatment of textile dyebath dump chloride (Cl-Concentration 8250 ppm) rich wastewater. The effluent used in the experiments was obtained from the cotton dyeing industry in Ludhiana/India. The performances of four electrode combinations (stainless steel-stainless steel, iron-iron, aluminium-aluminium and iron-aluminium) were investigated to remove color and COD concentration. In addition, best removal efficiency and minimum power consumption along with sludge generation rate was estimated. The coefficient of determination value (R2) of Color removal % was 0.984 as determined from Analysis of variance (ANOVA). Response surface methodology was followed for optimizing the voltage and treatment time. ANOVA model seems significant with Fe-Fe electrodes for CRWW and optimized process conditions were 1V and 8.2 min. to achieve 96% color removal efficiency. The study indicated that the dye bath dump wastewaters from cotton fabric dyeing can be consistently treated by electrolytic processes using iron electrodes.