Risk Assessment of AL-Nassyriah Oil Refinery Soil

摘要

The soil contamination with oil products such as diesel fuels and heating oils are complex mixtures of hydrocarbons has been increased recently due to large development of oil industries. This study deals with the risk assessment of neighbor site to the Al-Nassyriah oil refinery in Thi-Qar city, where the byproducts of refinery plant disposed into that site. The byproduct contaminant was considered as total petroleum hydrocarbons (TPH) to avoid treating the individual minerals and compounds consisting that contaminant. The study area was divided into three parts: the first part represents the highly contaminated soil; the second part represents the slightly contaminated soil and the third part represents the intact soil which used as reference to compare the study results. Three soil samples were obtained from each part of study area to measure the variation of TPH with depth. The second part includes risks assessment due to exposure to organic contaminated soil were followed the United States environmental protection agency method (USEPA) and the risk-based corrective action method (RBCA) to evaluate the study area. The risk assessment was based on exposure assessment and toxicity assessment, which depended on data collection and experimental work. The average concentrations of TPH were 3533, 1035 and 0 ppm in the soil samples NA_1, NA_2 and NA_3 respectively. The results of tests indicated that the three parts of site were nontoxic, but the exposure assessment of the three parts reflected that part NA1 needs for remediation when compared the concentrations of TPH with target levels.