DETERMINATION OF THE EFFECT OF VAPORIZATION, LEACHING AND MICROBIAL ACTION OF DIESEL OIL IN A SUBSURFACE ENVIRONMENT UNDER A CONCRETE PAVEMENT.

Pius Audu, Gogomary Oyet

Abstract


The effect of vapourization, leaching and microbial action of diesel oil in the subsurface environment under concrete pavement of some oil and gas facilities in south-south Nigeria coded as OAP and its pipeline Right of Way (ROW) was assessed. This assessment investigated oily marks on the OAP Right of Way (OAP ROW). Soil samples were collected from the subsurface environment of the concreted ROW. Spilled diesel on the ROW was sampled. Fresh diesel samples were also collected from the OAP depot. soil and diesel samples were semt for Laboratory analyses.Laboratory results were correlated to provide inference for discussion. The results showed that the marks on the ROW were patches of degrading diesel stains vapourizing from the soil in sub-surface environment of the concreted pavement in the OAP ROW. The degrading diesel may have been introduced by an oil spill, the source of which was not within the scope of this study. During such spill diesel oil may have moved horizontally underneath the concreted pavement. The environment of the OAP ROW stimulates volatilization though slowly but at a rate capable of completely degrading the subsurface hydrocarbon over time. Signatures on the chromatogram of diesel oil in soil samples at 1.2m depth show that leaching is not favoured in the environment from the degrading spill. Total petroleum hydrocarbon analysis shows that the chemical composition of the marks on the ROW is different from the current diesel spill. thus, marks on the ROW are not related to the current diesel spill on the ROW. From the chromatogram of the current spill, it is evident that there are ongoing subsurface leaks different from old spills. Remedial actions were also suggested.

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ISSN : 2251-1563