Marine transportation, while vital for global trade, faces increasing pressure to reduce its environmental impact, particularly air pollution affecting port cities. Scrubbers offer a solution for compliance with sulfur emission regulations, but the dynamic nature of ship operations, with fluctuating suction heads and operational demands, poses unique challenges to pump operations. These fluctuations impact pump duty and efficiency, making optimization crucial.This thesis investigates the optimization of centrifugal pumps within marine scrubbers, aiming to enhance energy efficiency and address the unique operational challenges they face. Through a comparative analysis of three distinct pump configurations, the research evaluates their impact on system performance, reliability, and financial viability. By carefully selecting and sizing pumps, the study seeks to balance operational efficiency and cost savings, while ensuring equipment longevity and compliance with environmental standards.The results reveal that strategic pump selection and proper system sizing can lead to significant energy savings, reduce operational costs, and improve the overall cost-effectiveness of exhaust gas treatment systems. The findings reveal that thoughtful pump selection and precise system sizing can lead to substantial energy savings and improved cost-effectiveness, making exhaust gas treatment systems more efficient.