VI-7-Removal of Organics and Colour from the Wastewater of Denim Industry.

Abstract

Textile Industry consumes considerable amount of water for dyeing, finishing, and sizing. The wastewater from the manufacturing facility is high in color (10000-15000 Pt Co), COD (2000-5000 mg/L), TDS (7000 — 9000 mg/L), and TSS (1000-2000 mg/L). Management of wastewater from the facility was the subject of this study. Intensive treatability studies involving physico-chemical and biological treatment was performed. Coagulation and flocculation followed by sedimentation using magnesium sulfate, ferric chloride, and polyelectrolyte resulted in 65 - 70 % reduction in suspended solids and colloids. Upflow anaerobic sludge blanket reactor followed by fluidized media reactor was applied after physico-chemical treatment for reduction of organics and color. The study implied that about 94% color, 90% COD, and 98% TSS reduction is possible. A final process design as well as economic study based on the laboratory findings has been carried out.