Systematic Review on Bacteria Growth Analysis in a Crude-oil Polluted Stagnant Water

Abstract

Crude oil pollution remains a major environmental challenge in regions with intensive petroleum exploration, particularly Nigeria’s Niger Delta. Stagnant water bodies in contaminated areas often accumulate petroleum hydrocarbons, creating ecological and health risks. This systematic review examines bacterial growth dynamics in polluted, stagnant water and evaluates the potential of indigenous microorganisms to drive natural attenuation. Mathematical models derived from n^th-order kinetics, Monod and Michaelis–Menten equations, and substrate–biomass interactions were analyzed to understand how crude oil concentration, nutrient availability, pH, and environmental conditions influence microbial proliferation. Empirical data from freshwater and saltwater systems reveal that Total Bacteria Count (TBC) increases progressively with time and depth, with rapid microbial multiplication observed after an initial adaptation phase. In freshwater, TBC rose from 175 cfu/ml on day 1 to 329,000 cfu/ml by day 84, while saltwater showed an increase from 124 cfu/ml to 103,000 cfu/ml over the same period. These trends confirm that bacteria acclimatize to petroleum-contaminated environments and subsequently accelerate hydrocarbon degradation. The review also highlights that aerobic conditions enhance bioremediation efficiency by approximately 30% compared to anaerobic processes. Integrated models incorporating dispersion, diffusion, and sedimentation further demonstrate how crude oil is transported, transformed, and degraded within stagnant water systems. Overall, the findings underscore the crucial role of microbial growth kinetics in predicting petroleum degradation and improving remediation strategies. Understanding these interactions provides a scientific basis for designing effective bioremediation interventions in crude-oil-impacted aquatic ecosystems.