Application of ball Clay/MnO2 based catalytic ozonation process for textile wastewater treatment

Due to rapid industrial and population growth water scarcity has become a major problem worldwide. The effluents released from textile wastewater contain huge amounts of unfixed dyes and inorganic pollutants. Various treatment methods are available for treatment but most of them are expensive and time-consuming. This study involves the comparison of single and combined processes such as ozonation (OZ), OZ/clay/MnO2, adsorption on clay/MnO2, and Combined process for the removal of color and COD (chemical oxygen demand) from textile wastewater. To the best of the author's knowledge, clay/MnO2 is the first time applied for the combined process for treating real textile wastewater. The removal efficiencies were compared for each process. The four process parameters were optimized: pH, ozone dose, catalyst dose, and reaction time for optimal removal. The Color removal efficiencies obtained for adsorption, ozonation, catalytic ozonation, and combined process were 84.9%, 95.4%, and 98.9% at pH 10, time 60 minutes, ozone dose 0.8 mg/min and catalyst dose 2 g/L. Thus, the combined process was found to be effective compared to a single process. This study helps to achieve the UN's sustainable development goal. However, it is recommended to use nanocomposite, which greatly facilitates the treatment of industrial wastewater in future studies.