- Kinetics models,
- Degradation rate constant
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Copyright (c) 2023 African Journal of Environment and Sustainable Development
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
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Crude oil pollution of soil is a major environmental concern that requires effective remediation. Bioremediation using microorganisms provides an eco-friendly approach. This study investigated the biodegradation of total petroleum hydrocarbons (TPH) in crude oil contaminated wet and dry soils treated with Pseudomonas sp. First order and Michaelis-Menten kinetics models were used to evaluate degradation rate constants. Results showed significant TPH reduction of up to 96.97% and 95.10% in wet and dry soils treated with Pseudomonas sp., respectively. The first order rate constant () increased from 0.0073 day-1 to 0.0394 day-1 in wet soil and from 0.0057 day-1 to 0.0298 day-1 in dry soil with Pseudomonas sp. treatment. The maximum specific degradation rate and Michaelis-Menten constants also varied based on treatment. Comparison of experimental TPH values with model predictions showed the first order kinetics provided a better fit (R2 0.9730-0.9869) than Michaelis-Menten model (R2 0.8318-0.9590). By utilising the rate constants, the models can effectively predict TPH reduction over time during bioremediation.