The effect of biodeterioration due to microbial growth in diesel, control using optimization of sulphur and consequences on Nigeria economy
Wiri Thankgod Bariyaa, Igoma Promise Sunday
Extended storage of petroleum product such as diesel enhances microbial growth resulting in sludge formation, diesel loss and corrosion in storage tanks. The use of biocides have been confirmed inappropriate due to high resistance to biodeteriorating agents, as well, high concentration of biocides have been confirmed to be hazardous to man. The research is targeted at the optimization of sulphur content in diesel in other to prevent biodeterioration due to microbial proliferation in storage tanks and pipes. The following concentrations of: 350, 400, 450 and 500 ppm of sulphur content were prepared to determine the corrosion frequencies and the degree of growth of Hormoconis resinae in each sample by measuring the deterioration effects in the diesel. Graphs are plotted to show the growth and corrosion in terms of losses due to sulphur. Suphur content optimizations were reach in other to struck a balance between the degree of corrosion to inhibition of Hormoconis resinae. The optimized sulphur content came to be between 380-400 ppm after analysis. Results shows that; the higher the sulphur concentration, the higher the corrosion rates of storage tanks and pipes. Also the higher the concentration of suphur the lower the proliferation of biodeteriorative agent Hormonis resinae. This implies that the increase in sulphur concentration prevents the growth of Hormoconis resinae which cause deterioration of diesel but increases corrosion. While the lower the concentration of suphur the lower the corrosion rate of storage tanks and pipes but high microbial growth rate in the diesel. The total loss of diesel due to microbial deterioration, the cost of purchasing sulphur and cost of replacing storage tanks and pipelines is a sort of economic lost to Nigeria thereby depreciating its gross domestic product (GDP).