Microbial Bioremediation of Petroleum Contaminants: Mechanisms, Applications, and Challenges

Oil pollution is one of the most persistent environmental threats affecting terrestrial and marine ecosystems worldwide. Bioremediation, an eco-friendly and cost-effective approach, utilizes microorganisms to degrade petroleum hydrocarbons into non-toxic end products. This review highlights the microbial diversity involved in oil degradation, including key bacterial and fungal genera such as Pseudomonas, Acinetobacter, Rhodococcus, Aspergillus, and Candida. It further discusses the enzymatic mechanisms underlying hydrocarbon degradation, both aerobic and anaerobic, and the environmental factors influencing microbial activity, such as temperature, pH, nutrient availability, and oxygen levels. Special attention is given to the role of biosurfactants in increasing hydrocarbon bioavailability and the advancement of modern technologies such as microbial electrochemical systems and genetic engineering for enhanced degradation. This paper also presents successful case studies of microbial oil bioremediation and compares it to other remediation strategies, emphasizing the potential and challenges of microbial approaches in large-scale applications. The comprehensive understanding provided here aims to guide future research and industrial applications for sustainable environmental restoration.