Polycyclic aromatic hydrocarbons: environmental pollution and bioremediation

Area of Science:

• Environmental Science
• Microbiology
• Biotechnology

Background:

• Polycyclic aromatic hydrocarbons (PAHs) are persistent environmental pollutants resulting from incomplete organic matter combustion.
• Many PAHs and their epoxides exhibit high toxicity, mutagenicity, and carcinogenicity, posing risks to ecosystems and human health.
• Conventional physicochemical remediation methods for PAHs have significant limitations.

Purpose of the Study:

• To review the challenges associated with polycyclic aromatic hydrocarbon (PAH) pollution.
• To explore the potential of microbial degradation and bioremediation for PAH removal.
• To discuss strategies for enhancing the efficiency of bioremediation for recalcitrant compounds.

Main Methods:

• Literature review on PAH pollution, toxicity, and degradation pathways.
• Analysis of current bioremediation strategies and their limitations.
• Discussion of emerging approaches like metabolic engineering and optimization of environmental factors.

Main Results:

• PAHs are widespread and toxic, with limited success in conventional removal methods.
• Xenobiotic-degrading microorganisms show potential for bioremediation but require enhancements.
• Factors like bioavailability, adsorption, mass transfer, and chemotaxis can improve microbial degradation efficiency.

Conclusions:

• Bioremediation holds significant promise for addressing PAH pollution.
• Metabolic engineering and optimization of environmental factors are crucial for effective microbial degradation of PAHs.
• Further research and development are needed to optimize bioremediation strategies for real-world applications.