[1] IEA (2012). Key World Statistics 2012. International Energy Agency, Paris.
[2] Ajiboye, AV, Lasisi KH, Babatola JO (2018) Evaluation of the effect of sodium hydroxide solution on biogas yield of anaerobic digestion of poultry waste and the digestate, International Journal of Energy and Water Resources, 2(1-4): 23-31. DOI 10.1007/s42108-018-0003-2.
[3] Gharaeea A, Khosravi-Nikoub MR, Anvaripoura B, (2019) Hydrocarbon contaminated soil remediation: A comparison between Fenton, sono-Fenton, photo-Fenton and sono-photo-Fenton processes, Journal of Industrial and Engineering Chemistry. 79: 181–193. https://doi.org/10.1016/j.jiec.2019.06.033.
[4] Zabbey N, Uyi H (2014) Community responses of intertidal soft-bottom macro zoo benthos to oil pollution in a tropical mangrove ecosystem, Niger Delta, Nigeria. Mar. Pollut. Bull., 82:167–174, http://dx.doi.org/10.1016/j.marpolbul.2014.03.002.
[5] Sam K, Coulon F, Prpich G (2017) Management of petroleum hydrocarbon contaminated sites inNigeria: Current challenges and future direction. Land use policy, 64: 133–144. http://dx.doi.org/10.1016/j.landusepol.2017.01.051
[6] Ambituuni A, Amezaga J, Emeseh E (2014) Analysis of safety and environmental regulations for downstream petroleum industry operations in Nigeria: problems and prospects. Environmental Development. 9: 43–60, http://dx.doi.org/10.1016/j.envdev.2013.12.002.
[7] Könnet BR (2014) Inadequate monitoring and enforcement in the Nigerian oil industry: the case of shell and ogoni land. Cornell Int. Law J. 11: 181–205.
[8] Ite AE, Ibok UJ, Ite MU, Petters SW (2013) Petroleum exploration and production: past and present environmental issues in the Nigeria’s Niger Delta. Nature, 1: 78–90.
[9] Linden O, Palsson J (2013) Oil contamination in ogoniland, Niger delta. Ambio, 42:685–701.
[10] UNEP (2011) Environmental Assessment of Ogoniland. UNEP, Switzerland.
[11] Nwilo PC, Badejo OT (2006) Impacts and management of oil spill pollution along the Nigerian coastal areas. Adm. Mar. Spaces Int. Issues 119.
[12] Oluwatuyi OE, Ajibade FO, Ajibade TF, Adelodun B, Olowoselu AS, Adewumi JR, Akinbile CO (2020) Total concentration, contamination status and distribution of elements in a Nigerian State dumpsites soil, Environmental and Sustainability Indicators, https://doi.org/10.1016/j.indic.2020.100021.
[13] Okonofua ES, Babatola J O, Ojuri OO (2018) Evaluation of Total Petroleum Content in Crude oil Exploration Field, Journal of the Nigerian Association of Mathematical Physics, 47: 229 – 234.
[14] Lin Q, Mendelssohn A (2009) Potentials of Restoration and Phytoremediation with Juncus roemerianus for Diesel Contaminated Coastal Wetlands. Ecology Engineering, 35 (1):
[15] Gomez F, Sartaj M (2013) Field scale ex-situ bioremediation of petroleum contaminated soil under cold climate conditions, International Biodeterioration and Biodegradation, 85: 375-382. http://dx.doi.org/10.1016/j.ibiod.2013.08.003
[16] Smith E, Thavamani P, Ramadass K, Naidu R, Srivastava P, Megharaj M (2015) Remediation trials for hydrocarbon-contaminated soils in arid environments: Evaluation of bioslurry and biopiling techniques, International Biodeterioration and Biodegradation, 101: 56-65. http://dx.doi.org/10.1016/j.ibiod.2015.03.029
[17] Okonofua, ES., Babatola, JO., Ojuri, OO, Lasisi, KH. (2020). Determination of Suitable TPH Remediation Approach via MANOVA and Inferential Statistics Assessment. Remediation. 30 (3):75-87. https://doi.org/10.1002/rem.21647.
[18] Wang SY, Kuo YC, Hong A, Chang YM, Kao CM (2016) Bioremediation of diesel and lubricant oil-contaminated soils using enhanced land farming system. Chemosphere, 164: 558-567.
[19] Petavy F, Ruban V, Conil P, Viau JY, Auriol JC (2009) Two treatment methods for stormwater sediments—pilot plant and landfarming—and reuse of the treated sediments in civil engineering. Environmental Technology, 30: 825–830.
[20] Giasi CI, Morelli A (2003) A landfarming application technique used as environmental remediation for coal oil pollution. Journal of Environ. Sci. Health, 38: 1557–1568.
[21] Hejazi RF, Hussain T, Khan FI (2003) Landfarming operation of oily sludge in arid region: human health risk assessment. Hazardous Materials, 99: 287–302.
[22] Khan FI, Husain T, Hejazi R (2004) An overview and analysis of site remediation technologies. Journal of Environmental Management, 71:95–122. http://dx.doi.org/10.1016/j.jenvman.2004.02. 003.
[23] Brown LD, Cologgi DL, Gee KF, Ulrich AC (2017a) Chapter 12 - bioremediation of oil spills on land. In: Fingas,M. (Ed.), Oil Spill Science and Technology, second ed. Boston, Gulf Professional Publishing, pp. 699–729.
[24] Besalatpour A, Hajabbasi MA, Khoshgoftarmanesh AH, Dorostkar V (2011) Landfarming Process Effects on Biochemical Properties of Petroleum-Contaminated Soils, Soil and Sediment Contamination: An International Journal. 20:2, 234-248. http://dx.doi.org/10.1080/15320383.2011.546447.
[25] Widada J, Nojiri H, Omori T (2002) Recent Development in Molecular Techniques for Identification and Monitoring of Xenobiotic-Degrading Bacteria and their Catabolic Genes in Bioremediation. Applied Microbiology and Biotechnology, 60: 45-49.
[26] Chien HY, Kao CM, Jou CJ, Yang PY, Huang CC (2008) Application of Enhanced Bioremediation to Clean-up Diesel-Oil Contaminated Soils: Laboratory Microcosm Study, Journal of Biotechnology. 136: S682. doi: 10.1016/j.jbiotec.2008.07.1581
[27] Brown DM, Okoro S, van Gils J, van Spanning R, Bonte M, Hutchings T, Linden O, Egbuche U, Bruun KB, Smith JWN (2017b) Comparison of landfarming amendments to improve bioremediation of petroleum hydrocarbons in Niger Delta soils. Science of the Total Environment. 596–597: 284–292.
[28] Maila MP, Cloete TE (2004) Bioremediation of petroleum hydrocarbons through landfarming: are simplicity and cost-effectiveness the only advantages? Rev. Environ. Sci. Biotechnol., 3:349–360. http://dx.doi.org/10.1007/s11157-004-6653-z.
[29] Heitzer A, Sayler GS (1993) Monitoring the efficacy of bioremediation. Trends in Biotechnology, 11:334–343. http://dx.doi.org/10.1016/0167-7799(93)90156-4.
[30] Liu SH, Zeng GM, Niu QY, Liu Y, Zhou L, Jiang LH (2017) Bioremediation mechanisms of combined pollution of PAHs and heavy metals by bacteria and fungi: a mini review, Bioresource Technology, 224:25–33. http://dx.doi.org/10.1016/j.biortech.2016.11.095.
[31] Adeniyi AA, Afolabi JA (2002) Determination of total petroleum hydrocarbons and heavy metals in soils within the vicinity of facilities handling refined petroleum products in Lagos metropolis. Environment International. 28: 79-82.
[32] Bhattacharya M, Biswas D (2014) Enhancement of waste engine oil biodegradation by optimization of media using factorial design study. Indian Journal of Biotechnology, 13:293-300.
[33] Jasmine J, Mukherji S (2014) Evaluation of bioaugmentation and biostimulation effects on the treatment of refinery oily sludge using 2n full factorial design. Environ. Sci.: Processes Impacts, 16:1889. doi: 10.1039/c4em00116h
[34] Agarry SE, Ogunleye OO (2012) Factorial Designs Application to Study Enhanced Bioremediation of Soil Artificially Contaminated with Weathered Bonny Light Crude Oil through Biostimulation and Bioaugmentation Strategy. Journal of Environmental Protection, 3: 748-759 doi:10.4236/jep.2012.38089
[35] Okonofua ES, Babatola JO, Ojuri OO (2019) Geo-environmental Assessment of Total Petroleum Hydrocarbon Content in Ologbo Field, Niger Delta, Nigeria. FULafia Journal of Science and Technology, Federal University, Lafia, 5 (1): 16-22.
[36] Montgomery DC (2008). Design and Analysis of Experiments, 7th Edition, John Wiley, New York.
[37] Forthofer RN, Lee ES, Hernandez M (2007) Biostatistics. Textbook Chapter 13: Linear Regression. Pp. 349-386. https://doi.org/10.1016/B978-0-12-369494-8.50018-2
[38] Meloun, M, Militky J (2011). Statistical Data Analysis: A Practical Guide. Textbook Chapter 6: Linear Regression Models. Pp. 449-629. https://doi.org/10.1533/9780857097200.449
[39] Tavares APM, Coelho MAZ, Agapito MSM (2006) Optimization and modelling of laccase production by T. versicolor in a bioreactor using statistical experimental design. Appl. Biochem. Biotechnol., 134: 233-248.
[40] Singh G, Ahuja N, Sharma P, Capalash N (2009) Response surface methodology for the optimized production of an alkalophilic laccase from -proteobacterium JB. BioResources, 4(2): 544-553.
[41] Cook RD (1977) Detection of Influenctial observations in Linear regression. Technometrics (American Statistical Association), Pp 14.
[42] Stephanie D (2016) Statistics how to: Cook’s distance and Cook’s D: Definition, Interpretation. Available on https://www.statisticshowto.datasciencecentral.com/cooks/distance/. Assessed 19 January, 2020.