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ABSTRACT
The efficiency of the bioremediation of a crude oil contaminated soil using a blend of cassava peel biochar and pig waste was investigated in this study. 10kg of the soil was contaminated with 150g of crude oil. 500g of contaminated soil were weighed each into Fourteen Bowl- RUN one through to fourteen -control included. Thirteen of the contaminated soil samples were bio-stimulated with a blend of pig waste and cassava peel bio-char in the ratio of 1:1 while the fourteenth bowl served as control. The amendment experiment was design employing the central composite design of response surface methodology. The process variables considered were duration of amendment (2-8 weeks) and composition of amendment materials was obtained by mixing 100g or 100% of amendment materials. Value of the physico-chemical properties particularly pH, nitrogen, Phosphorus and trace metals-Potassium, Sodium and Magnesium of the amendment material were markedly higher than in the contaminated soil which suggested their potential to facilitate contaminant degradation. The effect of the amendment materials on the Total Hydrocarbon Content (THC) were monitored in all samples for a period of eight weeks. Results showed a steady decrease in THC with an increase in retention time in all samples which indicated steady decomposition of crude oil contaminants during storage. Also a significant level of bioremediation was achieved using the pig waste and Cassava Biochar as amendments as shown by the maximum residual THC degradation of 462.03 mg/kg of contaminated soil.
