in a sustained reduction of microbial load, visual and a microscopic improvement in diesel quality, and a significant decrease in certification time, ultimately reaching a satisfac - tory settling time. The reduction of settling time by more than 40%, together with the decrease in fuel rejection rates, highlights the measurable operational and economic benefits of effective microbiological control. These results reinforce that die - sel storage should be treated as an active stage of quality control, where continuous monitoring, prevention, and mit - igation programmes are essential to avoid the recurrence of problems associated with biodeterioration and MIC. The approach presented in this study provides a techni - cal model applicable to other storage systems, contribut - ing to improved operational reliability, cost reduction, and extended asset service life. References 1 Passman, F.J. (2013) Microbial contamination and its control in fuels and fuel systems since 1980: A review. Int Biodeterior Biodegradation 81: 88-104. 2 Ludwiczak, A., Zieliński, T., Sibińska, E., Czeszewska-Rosiak, G., Złoch, M., Rudnicka, J., et al. (2025) Comparative analysis of microbial contami - nation in diesel fuels using MALDI-TOF MS. Sci Rep 15: 4525. 3 Bento, F.M., Gaylarde, C.C. (2001) Biodeterioration of stored diesel oil: studies in Brazil. Int Biodeterior Biodegradation 47: 107-112. 4 Dodos, G.S., Konstantakos, T., Longinos, S., Zannikos, F. (2012) Effects of microbiological contamination in the quality of biodiesel fuels. Glob NEST J 14: 175-182. 5 Bento, F.M., Englert, G.E., Gaylarde, C.C., Muller, I.L. (2004) Influence
of aqueous phase on electrochemical biocorrosion tests in diesel/water systems. Mater Corros 55: 577-585. 6 Liang, R., Duncan, K.E., Le Borgne, S., Davidova, I., Yakimov, M.M., Suflita, J.M. (2017) Microbial activities in hydrocarbon-laden wastewa - ters: impact on diesel fuel stability and the biocorrosion of carbon steel. J Biotechnol 256: 68-75. 7 ASTM D6469-20 (2017) D6469-20 Standard Guide for Microbial Contamination in Fuels and Fuel Systems. Gabriela Feix Pereira is laboratory application Leader at Dorf Ketal Brasil R&D, where she leads research and technical support initiatives focused on industrial biocides and microbial control in fuel, pulp and paper, and oilfield applications. Pereira holds a PhD in microbiology, with expertise in biofilms, biocorrosion, and applied industrial biotechnology. José Danilo Haick Tavares is a Fuel Additives Technical Support Manager for Dorf Ketal, with more than a decade of experience in fuel additive technologies, specialising in portfolio and product development. Tavares holds degrees in chemical engineering and business manage - ment, and a master’s in production engineering. Alex Sandro Santos Campos is a Process Engineer at Acelen in the area of refinery transfer and storage, responsible for planning and optimising the movement and storage of oil and derivatives, ensuring operational safety, tank integrity, quality control, and compliance with technical and regulatory standards. Campos holds a degree in chemical engineering with a postgraduate degree in lean manufacturing. Gustavo Artur Silva Santos is Area Manager for Downstream Northeast Brazil, at Dorf Ketal and is responsible for ensuring the execution of the strategic plan, monitoring established indicators and goals, as well as supporting the development of the product and service portfolio and being accountable for the results of the area of operation. Santos holds a degree in chemical engineering.
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