ABSTRACT
Spent engine oil contaminated soil was obtained from an automobile mechanic workshop at Ugbowo in Egor L.G.A., Benin City, Edo State and plaintain peel from a local farmer at Ekosodin, Ovia-North East L.G.A., Benin City, Edo State.The samples were airdried for a period of two weeks, reduced into a particle size of 2mm and characterized in terms of its physiochemical properties. Approximately, 1000mg/kg of spent oil contaminated soil was weighed into four different beakers and various amount of organic waste was added to; Flask A contained contaminated soil without amendment material (Plantain peel), and flask B,C and D contained SEO contaminated soil with 5g, 45g, and 65g of amendment material (PP), respectively which was maintained at 60% water holding capacity (WHC) for a duration of 7 weeks. The pH of the soil was determined to be (7.29_0.09), Electrical Conductivity (EC) recorded (61.31 _0.00 mS/cm), The pH was determined to be (7.40_0.05), Bulk density measured at (0.51_0.01 g/ml), Electrical Conductivity (EC) recorded (6.64_0.97mS/cm). Furthermore, the results revealed that the plantain peel biomas possess a substantial content of essential nutrients, including Niteogen (9.0mg/kg), and Phosphorous (5.80mg/kg), Potassium 117mg/kg), Sodium (29.0 mg/kg), and Magnesium (34.00 mg/kg). More importantly, the concentrations of specific heavy metals were all found to be below the established threshold values considered safe for soil. The concentratiin of THC present in the contaminatef soil resuced from 1000mg/kg to 463.3 ± 0.7mg/kg (53.9%), 374.3 ± 0.9mg/kg (62.7%), 314.3 ± 1.1mg/kg (51.6%), and 292.3 ± 0.5 mg/kg (70.8 %) respectively for PP at 0g, 5g, 45g and 65g. The THC reductiin of the contaminated soil wa found to be highest at 65g amendment application. The addition of the organic waste (PP) was effective in the reduction of the spent engine oil contaminated soil.
