Comparison of Ozonation and Electro-Fenton Processes for Sodium Azide Removal in Medical Laboratory Wastewater by Using Central Composite Design

ABSTRACT

This study aims to analyze sodium azide removal from medical laboratory wastewater by using Electro-Fenton (EF) and ozonation methods and to determine the optimum process conditions. Under optimum conditions; 98.9% and 99.6% sodium azide removal efficiency was obtained through EF and ozonation processes, respectively. This is the first and the only optimization study in literature in which response surface methodology and central composite design were used for sodium azide removal from wastewater. Results of the study indicated that EF and ozonation processes are effective methods for sodium azide removal, and central composite design is a suitable tool for process optimization.

KEYWORDS:

• Medical laboratory wastewater
• sodium azide
• electro-Fenton
• ozonation
• central composite design

Acknowledgements

This research has been supported by Ministry of Environment and Urbanization with the project entitled “Treatment and Management of Liquid Wastes and Wastewater from Healthcare Facilities” and by Yildiz Technical University-The Scientific Research Projects Coordinatorship with the research project number of FDK-2018-3426.