International Journal of Ecology and Environmental Sciences

International Journal of Ecology and Environmental Sciences


International Journal of Ecology and Environmental Sciences
International Journal of Ecology and Environmental Sciences
2019, Vol. 1, Issue 4
Modeling and assessment of human health risks from exposure to hydrocarbon contaminated soils in parts of bonny, Rivers State, Nigeria

Nwankwoala HO, Omofuophu E

The objective of this study was to establish the presence of contaminants of concern (CoC), determine, quantify and model spilled volume and ascertain potential health risk associated with the spill incident. The CoC include Total Petroleum Hydrocarbons (TPH), Polyaromatic Hydrocarbons (PAH) and BTEX compounds. The 3-D grid populated with the various modeled CoC, cross-sections and depth slices extracted from the model revealed that the CoC concentrations generally decreases with depth, with the highest concentrations centered towards the south-eastern part of the study area (Shell Tank Farm). The PAH model revealed that 563,000m3 of the total volume of the modeled area (47% of the area) exceeded DPR target value of 1.0mg/kg. The TPH concentration in all locations exceeded DPR target value of 50mg/kg while 222,500m3 of the modeled area (19% of the area) exceeded the intervention value of 5000 mg/kg. For BTEX, only 3% of the area exceeded the target value of 0.4mg/kg. Carcinogenic risk assessment for children and adults using both ingestion and dermal contact pathways showed that BS-1, BS-6, BS-7, BS-8 and BS-9 are carcinogenic to children while BS-7, BS-8 and BS-9 are carcinogenic to adults with the main contribution from Benzo (a) anthracene. PAH was recorded only at BW-1, (0.13µg/L), BW-3 (1.07µg/L) and BW-4 (0.25µg/L). Meanwhile BTEX compounds had concentration (5910µg/L) that exceeded DPR target value of 0.8µg/L over 7000 times. BS-10 is most deteriorated in soil quality. Soil sampling locations were cited within the tank farm vicinity, hence, might not pose much health risk to the surrounding communities because they are all positioned at higher hydraulic heads. This research therefore recommends that remedial actions be taken immediately to prevent health risk to workers in the tank farm area
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