Catalytic Treatment of Dye Bearing Wastewater

Abstract

Zeolite catalyst was synthesized from the fly ash, and it was used for thermal treatment and catalytic wet oxidation (CWO) of congo red dye bearing wastewater. Effects of various operating parameters like temperature, pH, H₂O₂ concentration and catalyst loading was observed on chemical oxygen demand (COD) and color removal at pH 2 and temperature 70°C with 4 ml dm^-3 H₂O₂ and 4 gm dm^-3 catalyst. Maximum 99.52% dye and 88% COD removal was obtained. Between CWO and catalytic thermolysis, the CWO was found to give better result.

Keywords: dye wastewater, congo red, thermolysis, wet oxidation