Navy blue 3G dye electrocoagulation using stainless steel electrode in presence and absence of granular activated carbon particle electrode

Abstract

Textile or dye wastewater is complex and toxic due to presence of complex chemicals in them hence difficult to treat with conventional biological treatment. This paper presents study of electrocoagulation treatment on simulated Navy Blue 3G dye wastewater using stainless steel electrode material in presence and absence of granular activated carbon as particle electrode. Preliminary test to understand effect of initial influent pH (3-10) and NaCl and Na2SO4 dose (0-2000 mg/L) on the EC process has also been investigated and further work was carried at optimized initial pH and NaCl dose. The results show that at highest studied current density of 10 mA/cm2 with stainless steel electrode showed complete removal of dye concentration after 90 min of treatment time. Electrocoagulation and adsorption using granular activated carbon (GAC)and stainless steel (SS+GAC) are good treatments when dispersed colour is present in the solution. Hence, change in decolourization efficiency of 2D EC was also studied on adding GAC particle electrode between anode-cathode assembly. The effect of current density and dye concentration on colour removal (%) was then studied. Complete removal of colour was observed at lesser time or at more current density; simultaneously initial dye concentration has shown inverse effect on colour removal. Higher removal of around 10 to 15% was reported with SS+GAC compared to SS alone.