Application of Response Surface Methodology for Sago Wastewater Treatment by Ozonation

Document Type : Original Article


1 School of Ocean Engineering and Underwater Technology, Kerala University of Fisheries and Ocean studies, Panangad, Kerala, India

2 Department of Environmental Engineering, Korea Maritime and Ocean University, Busan, South Korea

3 Department of Environmental Science, School of Earth Science Systems, Central University of Kerala, Kerala, India

4 Department of Energy and Refrigerating Air-Conditioning Engineering, Research Centre of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology, Taipei, Taiwan


A treatment method based on the degradation of sago processing wastewater using ozonation process was conducted in this research study. The optimization of the process variables was designed with the aid of software called Design Expert and the technique was called response surface methodology (RSM) in Central composite design. The effect of ozonation variables like pH, treatment time and ozone concentration on the reduction of chemical oxygen demand (COD) of sago waste water was investigated. Interestingly, two different types of results like maximum removal of COD and optimum removal of COD were observed. Maximum COD removal of 62.45% was at pH 9.8, ozonation time 95.7 min, ozone dose 42% and optimum COD removal 0f 56.7% was at pH 9.8, ozonation time 35.7 min, and ozone dose 42%. Bacterial count was found to be nil after ozonation and microscopic observation of biomass proved that the sludge content had effectively reduced after ozonation treatment. It was determined that the ozonation of sago wastewater was a promising effort in wastewater treatment.