Assessment of Heavy Metal and Polycyclic Aromatic Hydrocarbon (PAH) Levels in Drilling Fluids and Effluents from Niger Delta Oil Fields
Keywords:
Drilling mud effluents, heavy metals, petroleum, hydrocarbon, environmentAbstract
The Niger Delta region, located in southern Nigeria, West Africa, is a significant hub for oil production. However, drilling activities in this region generate substantial amounts of waste effluents, posing environmental and health risks. This study investigates the concentrations of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in drilling fluids and their effluents from Niger Delta oilfields. A total of 14 samples of produced water were collected from seven different oil drilling locations and analyzed for heavy metals and PAHs using Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) and Gas Chromatography-Mass Spectrometry (GC-MS), respectively. The results revealed elevated levels of some heavy metals and PAHs, exceeding international standards. Specifically, the mean concentrations of Aluminum (Al) (0.522 mg/L), Boron (B) (1.004 mg/L), and Iron (Fe) (2.359 mg/L) exceeded the WHO’s acceptable threshold limits for metals in water. In contrast, Barium (Ba), Cobalt (Co), Strontium (Sr), and Zinc (Zn) were within acceptable limits. Notably, some heavy metals were detected in the effluents but not in the drilling fluid. These included Beryllium (Be) (1.365 mg/L), Chromium (Cr) (0.094 mg/L), Manganese (Mn) (0.085 mg/L), and Thallium (Tl) (0.016 mg/L). Conversely, Antimony (Sb), Arsenic (As), Cadmium (Cd), Molybdenum (Mo), Nickel (Ni), Selenium (Se), Titanium (Ti), and Vanadium (V) were not detected in either the drilling fluid or the effluents. The analysis of PAHs in produced water samples revealed concentrations that exceeded EU standards by a significant margin, whereas the control sample showed relatively low concentrations. This study highlights the substantial environmental and health risks associated with heavy metal and PAH pollution in Niger Delta oilfields. These risks include potential harm to aquatic life, soil and groundwater contamination, and adverse human health effects. The findings emphasize the need for enhanced regulatory measures, improved waste management practices, and the adoption of eco-friendly drilling fluid alternatives. This study contributes to a better understanding of the impact of heavy metal and PAH pollution in Niger Delta oilfields and provides valuable insights for policymakers, oil companies, and stakeholders on the necessity of sustainable environmental management practices. Recommendations include regular monitoring, effective waste disposal strategies, and personnel training programs to mitigate heavy metal and PAH pollution in the region.
References
Abdelhafez, A.A., Abbas, M.H., Attia, T. (2015) Environmental monitoring of heavy-metals status and human health risk assessment in the soil of Sahl ElHessania area, Egypt. Polish Journal of Environmental Studies, 24 (2), 459.
Adebayo, B. (2019). "Major new inquiry into oil spills in Nigeria's Niger Delta launched". CNN.
Agency for Toxic Substances and Disease Registry (ATSDR). (2019). Toxicological Profile for Polycyclic Aromatic Hydrocarbons (PAHs).
Ajayi, S. O., & Oyetade, A. O. (2013). Coastal Erosion and Its Impact on the Livelihood of Fishing Communities in Nigeria. Journal of Environmental Science and Water Resources, 2(1), 1-9.
Akwa Ibom State Government. (2020). Akwa Ibom State at a Glance.
Albert, O. N., Amaratunga, D., Haigh, R. P. (2018). "Evaluation of the Impacts of Oil Spill Disaster on Communities and Its Influence on Restiveness in Niger Delta, Nigeria". Procedia Engineering. 212: 1054–1061.
Amadi, A. N., Olasehinde, P. I., Yisa, J., Okosun, E. A., & Nwankwoala, H. O. (2014). Environmental Assessment of Water Quality in a Decommissioned Crude Oil Reserve in Oloibiri Community, Bayelsa State, Nigeria. Journal of Environmental Science and Engineering, 3(4), 235-243.
Anderson, I. (2005) Niger River basin: A Vision for Sustainable Development Pp. 1–131 The World Bank.
Andráš, P., Nagyová, I., Samešová, D., Melichová, Z. (2012) Study of environmental risks at an old spoil dump field. Polish Journal of Environmental Studies, 21 (6), 1529.
Arthur, J.D., Langhus, B.G., Patel, C. (2005). Technical Summary of Oil and Gas Produced Water Treatment Technologies, http://www.rrc.state.tx.us/ commissioners/williams/environment/produced water trtmnt Tech.pdf.
Awaka-ama, J. J., Udo, G.J., Uwanta, E.J., Igwe, R., Etukudo, N. J. and Nyeneime William Akpanudo, N. W. (2024). Comparative Analysis of Heavy Metal Contamination in Regular and Artisanal Petroleum Products in Akwa Ibom State, South-South Nigeria. _Communication in Physical Sciences, 11(3): 559-568.
Awaka-Ama, J. J., Udo, G. J., Nyong, A. E., Umanah, I., Bassey, M. E. (2024). Heavy Metals, Polycyclic Aromatic Hydro-carbons, Total Petroleum Hydro-carbons and Total Hydrocarbon Contents in Drilling Mud Effluents from Eastern Obolo Oilfield in the Niger. Journal of Applied Sciences and Environmental Management 28 (9), 2849-2854.
Awaka-Ama, J. J., Udo, G. J., Uwanta, E. J., Etukudo, N. J., Akpanudo, N. W., Igwe, R. (2024). Comparative Analysis of Heavy Metal Contamination in Regular and Artisanal Petroleum Products in Akwa Ibom State, South-South Nigeria. Communication in Physical Sciences 11 (3).
Ayanalde, P. (2015). "Assessing wetland degradation and loss of ecosystem services in the Niger Delta, Nigeria". Journal of marine and freshwater research. 67:828- 836.
Baird, J. (2010). "Oil's Shame in Africa". Newsweek: 27.
Baker, J. E., & Eisenreich, S. J. (1990). Concentrations and fluxes of polycyclic aromatic hydrocarbons and polychlorinated biphenyls across the air–water interface of Lake Superior. Environmental science and technology, 24:342-352.
Bhagure, G. R., Mirgane, S. R. (2011). Heavy metal concentrations in ground waters and soils of Thane region of Maharashtra, India. Environmental Monitoring and Assessment, 173 (1-4), 643.
Bhatia, A. L., Tausch, H., Stehlik, G. (1987). Mutagenicity of chlorinated polycyclic aromatic compounds. Ecotoxicology and environmental safety, 14:48-55.
Boysen, D. B., Boysen, J. E., Boysen, J. A. (2002). Creative Strategies for Produced Water Disposal in the Rocky Mountain Region, http://www.ipec.utulsa.edu/ Conf2002/boy-sen 89.
Bronwen, M. (2007). The Price of Oil: Corporate Responsibility and Human Rights Violations in Nigeria's Oil Producing Communities 5: 52.
Coover, M. P., Sims, R. C. (1987). The effect of temperature on polycyclic aromatic hydrocarbon persistence in an unacclimated agricultural soil. Hazardous waste and hazardous materials, 4:69-82.
Costantino, J.P., Redmond, C.K., Bearden, A. (1995). Occupationally related cancer risk among coke oven workers: 30 years of follow-up. Journal of occupational and environmental medicine, 37:597-604
DalFerro, B., Smith, M. (2007). Global Onshore and Offshore Water Production, http://www.touchoilandgas.com/global-onshore-offshore-water-a7137- 1.html.
Donatus, P. (2016). "Shell's Nigeria ecocide is creating a refugee crisis". www.greenleft.org.au.
Ekanem, A. N., Udo, G. J., Okori, B.S. (2021). Determination of polycyclic aromatic hydrocarbons in soil and water around automobile repair workshops within Eket metropolis in Akwa Ibom State, Nigeria using GC-MS. Journal of Environmental Treatment Techniques, 9 (4), 819-830.
Ekeocha, C. N. (2017). The Impact of Oil Exploration on the Environment and Livelihood of Rural Communities in Akwa Ibom State, Nigeria. Journal of Environmental Science and Water Resources, 6(2), 1-12.
Ekins, P.,Vanner, R., Firebrace, J.(2007). Zero emissions of oil in water from offshore oil and gas installations: economic and environmental implications, J. Clean. Prod., 15 1302–1315.
Etesin, U. M, George, N. J, Ogbonna, I. J. & Akpan, I. O. (2023). Source Identification and Variation in the chemical Composition of Rainwater in the Coastal and Industrial Areas: A Case Study of Ikot Abasi, South-Eastern Nigeria. Earth Sciences Malaysia, 7(1): 55-63.
Eze, V. C., Ananso, F. N., & Anene, U. (2014). Assessment of the Physicochemical Parameters and Heavy Metals Toxicity of Leachates from Municipal Solid Waste Dumpsites in Port Harcourt, Nigeria. African Journal of Environmental Science and Technology, 8(6), 41-45.
Faksness, L. G., Grini, P. G., Daling, P. S. (2004). Partitioning of semi-soluble organic compounds between the water phase and oil droplets in produced water, Mar. Pollut. Bull. 48 731–742.
Faucon, M., Margaret, C. (2015). "Shell to Pay $80 Million Compensation for Oil Spills in Nigeria". Wall Street Journal. ISSN 0099-9660.
Golding, L. A., McKnight, K., Binet, M., Adams, M., & Apte, S. C. (2018). Toxicity of dissolved and precipitated forms of barium to a freshwater alga (Chlorella sp. 12) and water flea (Ceriodaphnia dubia). Environmental Toxicology and Chemistry, 37(6), 1632-1642.
Grimmer, G., Jacob, J., Naujack, K.W. (1981). Profile of the polycyclic aromatic hydrocarbons from lubricating oils. Inventory by GCGC/MS — PAH in environmental materials, part 1. Fresenius' Zeitschrift für Analytische Chemie, 306:347-355.
Hansen, B.R., Davies, S.H. (1994) Review of potential technologies for the removal of dissolved components from produced water, Chem. Eng. Res. Des., 72 176–188.
Hinsch, R. (2019). "Wahala: trouble in the Niger delta – photo essay". the Guardian.
Hsu, Y. M., Harner, T., Li, H., & Fellin, P. (2015). PAH measurements in air in the Athabasca oil sands region. Environmental Science and Technology, 49, 5584–5592.
Hu, C., He, M., Chen, B., Zhong, C., & Hu, B. (2014). Sorptive extraction using polydimethylsiloxane/ metal-organic frame-work coated stir bars coupled with high performance liquid chromatography-fluorescence detection for the determination of polycyclic aromatic hydrocarbons in environmental water samples. Journal of Chromatography A, 1356, 45–53.
Hu, J., Liu, C., Zhang, G., Zhang, Y., Li, S., Zhao, Z., Guo, Q. (2016). Distribution characteristics and source apportionment of polycyclic aromatic hydrocarbons (PAHs) in the Liao River drainage basin, northeast China. Environmental Monitoring and Assessment, 188(4), 1–12.
Hu, Y., Bai, Z., Zhang, L., Wang, X., Zhang, L., Yu, Q., & Zhu, T. (2007). Health risk assessment for traffic policemen exposed to polycyclic aromatic hydrocarbons (PAHs) in Tianjin, China. Science of The Total Environment, 382, 240–250.
Hu, Y., Li, G., Yan, M., Ping, C., & Ren, J. (2014). Investigation into the distribution of polycyclic aromatic hydrocarbons (PAHs) in wastewater sewage sludge and its resulting pyrolysis bio-oils. Science of The Total Environment, 473– 474, 459–464.
Hua, H., Zhao, X., Wu, S., & Li, G. (2016). Impact of refining on the levels of 4-hydroxy-trans-alkenals, parent and oxygenated polycyclic aromatic hydrocarbons in soybean and rapeseed oils. Food Control, 67, 82–89.
Hua, L., Wu, W. X., Liu, Y. X., Tientchen, C. M., & Chen, Y. X. (2008). Heavy Metals and PAHs in Sewage Sludge from Twelve Wastewater Treatment Plants in Zhejiang Province. Biomedical and Environmental Sciences, 21, 345–352.
Huang, H., Wu, K., Khan, A., Jiang, Y., Ling, Z., Liu, P., Li, X. (2016). A novel Pseudomonas gessardii strain LZ-E simultaneously degrades naphthalene and reduces hexavalent chromium. Bioresource Technology, 207,
Hussain, K., Balachandran, S., & Hoque, R. R. (2015). Sources of polycyclic aromatic hydrocarbons in sediments of the Bharalu River, a tributary of the River Brahmaputra in Guwahati, India. Ecotoxicology and Environmental Safety, 122, 61–67.
Hussain, K., Rahman, M., Prakash, A., & Hoque, R. R. (2015). Street dust bound PAHs, carbon and heavy metals in Guwahati city – Seasonality, toxicity and sources. Sustainable Cities and Society, 19, 17–25.
Ilechukwu, LC Osuji, CP Okoli, MO Onyema, GI Ndukwe (2021). Assessment of heavy metal pollution in soils and health risk consequences of human exposure within the vicinity of hot mix asphalt plants in Rivers State, Nigeria. Environmental monitoring and assessment, 193 (8), 461.
IARC (1986). Tobacco smoking. Lyon, International Agency for Research on Cancer, 139 pp. (IARC Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans, Vol. 38).
International Agency for Research on Cancer (IARC). (2010). Some Non-Heterocyclic Polycyclic Aromatic Hydrocarbons and Some Related Exposures. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, 92
International Agency for Research on Cancer (IARC). (2010). Some Non-Heterocyclic Polycyclic Aromatic Hydrocarbons and Some Related Exposures. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, 92.
Isaac, P., Martínez, F. L., Bourguignon, N., Sánchez, L. A., & Ferrero, M. A. (2015). Improved PAHs removal performance by a defined bacterial consortium of indigenous Pseudomonas and actinobacteria from Patagonia, Argentina. International Biodeterioration and Biodegradation, 101, 23–31.
Ishizaki, A., Sito, K., & Kataoka, H. (2011). Analysis of contaminant polycyclic aromatic hydrocarbons in tea products and crude drugs. Analytical Methods, 3, 299–305.
Ite, A. E., Ibok, U. J., Ite, M. U., & Petters, S. W. (2018). Petroleum Exploration and Production: Past and Present Environmental Issues in the Nigeria’s Niger Delta. American Journal of Environmental Protection, 4(2), 21-37.
Khan, M. S., Zaidi, A., Wani, P. A., Oves, M. (2009). Role of plant growth promoting rhizobacteria in the remediation of metal contaminated soils. Environmental Chemistry Letters, 7 (1), 1.
Khan, Z. I., Ashraf, M., Ahmad, K., Bayat, A., Mukhtar, M.K., Naqvi, S.A., Shaheen, M. (2012). Lead toxicity evaluation in Rams grazing on pasture during autumn and winter: a case study. Polish Journal of Environmental Studies, 21 (5), 1257.
Khatib, Z., Verbeek, P. (2002). Water to value-produced water management for sustainable field development of mature and green fields, in: SPE International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, Journal of Petroleum Technology, 55(01):26-28
Kuala Lumpur, A. K. Inengite, N. C. Oforka, L. Osuji (2010). Evaluation of Polycyclic Aromatic Hydrocarbons in sediment of Kolo Creek in the Niger Delta. International Journal of Applied Environmental Sciences, 5(1):127-143.
Limson, J, (2002). "Environmental Remediation in Nigerian oil Regions". scienceinafrica.co.za.
Manby, B. (January 1999). "The Price of Oil". Human Rights Watch.
National Population Commission. (2006). 2006 Population Census
Ndu, J. A., & Akpan, E. I. (2018). Assessment of the Impact of Coastal Erosion on Fishing Activities in Eastern Obolo Local Government Area of Akwa Ibom State, Nigeria. Journal of Fisheries and Aquatic Science, 13(1), 1-11.
Nduka, J. K., Orisakwe, O. E., Ezenweke, L. O., Chendo, M. N., & Ezealisiji, K. M. (2010). Heavy Metal Levels in Blood of the People Exposed to Smoke from Firewood and Kerosene in Nigeria: A Pilot Study. Journal of Applied Sciences and Environmental Management, 14(1), 19-22.
Numbere, O. A. (2020). "The Impact of Landscape Reclamation on Mangrove Forest and Coastal Areas in the Niger Delta, Nigeria". The Impact of Landscape Reclamation on Mangrove Forest and coastal areas in Niger Delta. IntechOpen. doi:10.5772/intechopen.82053. ISBN 978-1789847635. S2CID 213441196.
Nwaichi, E. O., Wegwu, M. O., & Nwosu, U. L. (2016). Distribution of Selected Carcinogenic Hydrocarbons and Heavy Metals in an Oil-Impacted Soil Ecosystem in the Niger Delta. Environmental Monitoring and Assessment, 184(6), 3987-3995.
Nwilo, P. C. & Olusegun T. B. (2007). Impacts And Management of Oil Spill Pollution Along the Nigerian Coastal Areas International Federation of Surveyors.
Nwilo, P.C. &Badejo, O. T. (2001). Impacts of Oil spills along the Nigerian coast The Association for Environmental Health and Sciences.
Obire, O., Tamuno, D. C., & Wemedo, S. A. (2003). Physicochemical Quality of Elechi Creek in Port Harcourt, Nigeria. Journal of Applied Science and Environmental Management, 7(1), 43-49.
Ogbonnaya, C., & Oguzie, A. E. (2011). Evaluation of Heavy Metals in Effluents from Three Petroleum Flow Stations in the Niger Delta Area of Nigeria. Proceedings of the Annual International Conference on Soil, Water, and Environmental Quality, 89-93.
Ogunkunle C.O., &Fatoba P.O. (2013) Pollution loads and the ecological risk assessment of soil heavy metals around a mega cement factory in southwest Nigeria. Polish Journal of Environmental Studies, 22(2), 487.
Oil and the environment (2022). U.S. Energy Information Administration (EIA)". www.eia.gov.
Okon, O. (2017). "Bioaccumulation of Heavy Metals in Cucurbita maxima Duch. and Telfairia occidentalis Hook. F. Grown on Crude Oil Polluted Soil Citation". American Journal of Agricultural Science, 4: 88–93.
Ololade, I. A., Oladoja, N. A., Oginni, O. A., & Adetunji, M. T. (2007). Chemical Speciation and Potential Mobility of Some Toxic Metals in the Soil of a Mechanic Village. Chemical Speciation and Bioavailability, 19(4), 177-184.
Oluseyi, T., Isibor, P. O., Kambi, M., & Akinsanya, B. (2020). Acute toxicity of produced water on selected organisms in the aquatic environment of the Niger Delta. Scientific African, e00460. https://doi.org/-10.1016/j.sciaf.2020.e00460
Onwukwe, S. I., & Nwakaudu, M. S. (2012). Drilling wastes generation and management approach. International Journal of Environmental Science and Development. 3:3-6.
Osahon, K. E., & Julius (2019). "Nigeria: MOSOP Petitions Buhari, UNPO, EU Over OML 11". The Guardian (Lagos).
Osemwengie, G. (2010). "As Goodluck would have it: Theophilus Danjuma! His $500 Million Booty & $100 million Donation to Charity". Sahara Reporters.
Ossai, I. C., Ahmed, A., Hassan, A., & Hamid, F. S. (2019). Heavy Metals Assessment in Crude Oil-Contaminated Soils of the Niger Delta. Nigeria. Journal of Health and Pollution, 9(24), 191203.
Osuji, L. C., & Adesiyan, S. O. (2005). The Isiokpo Oil Pipeline Leak: Total Organic Carbon/Total Organic Matter Contents of Affected Soils. Chemistry & Biodiversity, 2(8), 1079-1084.
Osuji, L. C., Inengite, A.K., Oforka, N. C., (2010). Evaluation of polycyclic aromatic hydrocarbons in sediment of Kolo Creek in the Niger Delta, Int. J. App. Env. Sci 5 (1), 127-143.
Osuji, L. C., Onojake, M. C., Oforka, N. C. (2013). Evaluation of polycyclic aromatic hydrocarbons in sediment of Kolo Creek in the Niger Delta. Egyptian Journal of Petroleum, 22 (2), 217-224.
Osuji, L. C., & Adesiyan, S. O. (2005). Extractable hydrocarbons, nickel and vanadium contents of Ogbodo-Isiokpo oil spill polluted soils in Niger Delta, Nigeria. Environmental monitoring and assessment 110, 129-139.
Osuji, L. C., Onojake, M. C., Oforka, N.C. (2013). Preliminary hydrocarbon analysis of crude oils from Umutu/Bomu fields, south west Niger Delta Nigeria. Egyptian Journal of Petroleum, 22 (2), 217-224.
Raymond, R. (2013). "Shell and Ogoni People: oil pollution in the Niger Delta". Peace Palace Library. Archived from the original.
Sardans, J., Montes, F., Penuelas, J. (2011) Electrothermal atomic absorption spectrometry to determine As, Cd, Cr, Cu, Hg, and Pb in soils and sediments: A review and perspectives. Soil and Sediment Contamination, 20 (4), 447.
Simire, M. (2012). "Oil wealth and worrisome environmental challenges in Niger Delta". Enviro News Nigeria.
Smith, M. B., & March, J. (2007). March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. Wiley-Interscience.
Udo, E. J., & Nwadike, R. I. (2015). Environmental Impacts of Oil Spillage on the Coastal Communities of Akwa Ibom State, Nigeria. Journal of Environmental Science and Water Resources, 4(1), 1-10.
Udo, G. J., Nwadinigwe, C., Nwadinigwe, A., & Awaka-ama, J. J. (2017). Correlation between extractable heavy metals (Ni, V, Cd, and Pb) in soil and Colocasia spp (cocoyam corm) from farm lands in Ibeno coastal area, Niger Delta, Nigeria. Journal of Science and Engineering Research, 4(8), 54-61.
Udo, G. J., Isaac, I. O., Nsi, E. W., Awaka-ama, J. J., Nyong, A. E. & Igwe, R. C. (2023). Concentrations of Monocyclic Aromatics Hydrocarbons: Benzene, toluene, ethyl-benzene, and xylene (BETX) in gasoline samples distributed in Uyo, Niger Delta, Nigeria. Res. J. Sci. Technol.3 (4): 46 – 60
UNEP (2024). United Nations Environment Programme Report on Ogoniland Cleanup project.
United States Environmental Protection Agency (USEPA). (2019). Polycyclic Aromatic Hydrocarbons (PAHs).
Veil, J., Puder, M. G., Elcock, D., Redweik, R. J. (2004). A White Paper Describing Produced Water from Production of Crude Oil, Natural Gas and Coal Bed Methane, http://www.netl.doe.gov/publications/oil pubs/prodwaterpaper.pdf.
Veil, J. V. (2007). Research to Improve Water-use Efficiency and Conservation: Technologies and Practice, http://www.ead.anl.gov/pub/-doc/testimony veil final.pdf.
Vidal, J. (2011). "Niger delta oil spills clean-up will take 30 years, says UN". The Guardian. ISSN 0261-3077.
Wali, E., Nwankwoda, H. O., Ocheje, J. F., & Chinedu, J. O (2019). Oil spill Incidents and wetlands loss in Niger Delta: Implication for Sustainable Development Goals. International Journal of environment and pollution, 7, 1-200.
WHO (1996). Polynuclear aromatic hydrocarbons. In: Guidelines for drinking-water quality, 2nd ed. Vol. 2. Health criteria and other supporting information. Geneva, World Health Organization, pp. 495-505.
WHO (2010). Non-heterocyclic polycyclic aromatic hydrocarbons. Geneva, World Health Organization, International Programme on Chemical Safety (Environmental Health Criteria 202) (in press).
Wild, S. R., Berrow, M. L., Jones, K.C. (1991). The persistence of polynuclear aromatic hydrocarbons (PAH's) in sewage sludge amended agricultural soils. Environmental pollution, 72:141-157
Wuana, R. A., & Okieimen, F. E. (2011). Heavy metals in contaminated soils: A review of sources, chemistry, risks and best available strategies for remediation. Isrn Ecology. 10:3545-402647.
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