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Activities of soil microbial exudates (lipase and dehydrogenases) reflect the extent of metabolism in an ecosystem polluted with spent engine oil undergoing remediation. This study investigated these ex-situ using biochemical tools during the bio-augmentation with poultry droppings. The result revealed that at 1.0 – 3.5% contamination across days-zero to -28, spent engine oil which significantly (p < 0.05) inhibited the activity of soil lipase from 5.80 ± 0.10 to 1.80 ± 0.05mol/min was significantly (p < 0.05) stimulated from 5.80 ± 0.10 to 6.50 ± 0.01mol/min during the bio-augmentation. Conversely, the activity of soil dehydrogenases which was significantly (p < 0.05) stimulated from 4.72 ± 0.01 to 9.78 ± 0.04mol/min suffered inhibition significantly (p < 0.05) from 4.72 ± 0.01 to 3.80 ± 0.10mol/min during soil enrichment with poultry droppings. These two groups of enzymes have demonstrated that they could be used in concert as biomarkers of hydrocarbon-polluted soil ecosystem undergoing remediation. The inhibition in the activity of soil dehydrogenases occasioned during bio-augmentation will forestall the catabolic removal of the pollutant by this enzyme. The activity of these enzymes which was concentration and time dependent of the pollutant and bio-augmenting agent affected the entire soil biochemistry. Ecosystem dynamics and mineralization which were impaired and disrupted during the contamination were restored during the remediation process.

IMPACT ASSESSMENT OF THE ACTIVITIES OF SOIL LIPASE AND DEHYDROGENASES IN SPENT ENGINE OIL-POLLUTED ECOSYSTEM UNDERGOING REMEDIATION