Sustainability in maritime transport: Selecting ballast water treatment for a bulk carrier.

The study provides a comprehensive assessment of ballast water treatment systems (BWTS) selection regarding crucial parameters such as energy efficiency, fuel consumption, and CO 2 emissions. The focus of the study is investigating the environmental impacts of BWTS and how these impacts can be considered in decision-making processes. In this context, it comprehensively analyzes the importance of decision-making parameters and the environmental consequences of BWTS applications. The potential impacts of the system on the sustainability of the maritime industry are highlighted. In this context, seven different BWTSs for a bulk carrier of 83,000 deadweight tonnes are evaluated using Analytical Hierarchy Process (AHP) and Preference Ranking Technique by Similarity to Ideal Solution (TOPSIS). According to the analysis, Operational Expenditure (0.314508), Capital Expenditure (0.249515), and Capacity (0.159952) are the most critical factors. Among the seven systems analysed, product G (0.8561137) emerges as the most suitable option. The analysis represents 3% of total emissions (456.5 tonnes CO 2) and highlights the impact of BWTS on CO 2 emissions. The results underline the need for innovative approaches aimed at ensuring the long-term sustainability of the maritime industry. • The study highlights the optimal BWTS selection for sustainable ship prodution. • Seven BWTS devices appropriate for a bulk carrier are assessed and their qualities are weighted. • The proposed equipment was installed on a real commercial vessel and operated for one year. • Increased fuel consumption during operations accounts for 456.5 tons of CO 2 per year. • While the BWTS system protects the marine environment, it generates additional emissions. [ABSTRACT FROM AUTHOR]