Journals Proceedings

Abstract

Appropriate and effective treatment option of textile dye wastewater has become a major concern for a developing country like Bangladesh where untreated or partially treated effluent discharges reluctantly into water body. This study suggests optimum combined treatment units after extensive laboratory tests. The primal objective was to determine the avail of activated carbon in textile dye wastewater treatment. Laboratory scale model studies and field performance have been observed to optimize treatment processes. Use of bleaching powder (BP), a source of chlorine (Cl2), as an oxidizing agent in combination with coagulant (ferrus-sulphate-FeSO4) was found very beneficial in this study. Successive mixing of bleaching powder (BP) and coagulant with a lag time 15 minutes increases the color & COD removal efficiency. Chemical unit processes are more competent and provide satisfactory performance in combination with physical and biological process than alone. Reduction of color is satisfactory and a percentage of 66 percent of initial. COD removal is not very satisfactory but reduced by 15 percent whereas biological process results reduction of 70 percent. For further control of wastewater parameters granular activated carbon (AC) was used as tertiary treatment option. It polishes the effluent and reduces COD by 8-10 percent, Color reduction is 6-10 percent of Initial. For a fixed flow rate and surface area column in series perform better than a single column of same length due to the flow in upward direction in the second column in series which increases the contact time of activated carbon surface with wastewater.