New Study on biodiesel-bunker fuel blends as marine pollutants

A new study on blends of biodiesels with conventional marine bunker fuels has been commissioned by EMSA to address critical knowledge gaps concerning alternative fuels as potential marine pollutants, as well as the effectiveness of response measures in the event of accidental releases.

Among the alternative fuels currently being deployed, biodiesel blends based on Fatty Acid Methyl Esters (FAME), Hydrotreated Vegetable Oil (HVO) and Fischer–Tropsch (FT) represent a near-term, “drop-in” solution compatible with existing marine engines and infrastructure. Blends such as B20, B30 and B50, used with Marine Gas Oil (MGO) or Very Low Sulphur Fuel Oil (VLSFO), enable emissions reductions without requiring major technical modifications in ship engines and supply chain.

However, their behaviour as marine pollutants and the suitability of existing response measures in the event of accidental spills are not yet comprehensively documented, highlighting the need for a structured, evidence-based assessment grounded in results from experimental recovery tests.

Conducted jointly by the World Maritime University (WMU) and Cedre, this study aims to support the maritime sector by strengthening spill contingency planning, preparedness, and response as the transition to alternative fuels accelerates.

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