Journal
BIOINTERFACE RESEARCH IN APPLIED CHEMISTRY
Volume 12, Issue 4, Pages 5698-5708Publisher
BIOINTERFACE RESEARCH APPLIED CHEMISTRY
DOI: 10.33263/BRIAC124.56985708
Keywords
bio-corrosion; biofilm; Bacillus; biodiesel; metabolites
Categories
Funding
- Ministry of Research, Technology, and Higher Education (DIKTI) Indonesia through PMDSU [128/SP2H/PTNBH/DRPM/2018]
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Microorganisms in biodiesel storage tanks may cause corrosion, with higher biodiesel concentration promoting microbial growth and corrosion rate.
Microorganisms in biodiesel storage tanks may generate bio-corrosion due to their hygroscopic and susceptible fuel degradation. The organisms, including Bacillus megaterium present in the hydrocarbons, resulted from the EPS and metabolites processes that subsequently control the corrosion process of the tank. This present study examined the effect of biodiesel concentration on microbial activity through TPC analyzing growth for B. megaterium. Furthermore, this study investigated EPS formation and acid metabolites production by B. megaterium based on SEM observations and acidimetric titration. Meanwhile, this study investigated the microorganism-induced corrosion impact based on gravimetric analysis. The results explained a higher biodiesel concentration in diesel oil promoted an increase in the growth of B. megaterium and the corrosion rate. Conversely, the acid metabolites produced from bacteria under the biofilm did not significantly increase the corrosion rate. Corrosion products resulting from the B. megaterium activity on the surface of the steel included Iron (II, III) oxide (Fe2O3 and Fe3O4). The formation of oxide and pitting may control the strength of the surface tank in the course of biofuel storage, which may lead to the failure of the material.
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