Search

Biodegradation of polycyclic aromatic hydrocarbons (PAHs) is a major concern in the environment due to their toxic nature and ubiquitous occurrence. PAHs remain sorbed to soil organics and interact with non-aqueous phases and therefore, become less available for degradation. Several microorganisms like bacteria, fungi, and algae have the capability to degrade soil-sorbed PAHs using different metabolic pathways. The focus of this review is microbial degradation of high molecular weight PAH pyrene by pure and mixed culture, including biological aspects of biosurfactants produced during the process for increasing the bioavailability of soil-sorbed or non-aqueous phase pyrene. High molecular weight PAHs are generally recalcitrant to microbial attack, although some bacteria, fungi, and algae are capable of transforming these compounds by using them as the sole source of carbon and energy. Also, the use of microbial consortium has been found to be more efficient and better from an economic point of view for degradation due to synergistic interactions among microbial species. The review also explains the role of catabolic genes involved in the degradation of pyrene. [ABSTRACT FROM AUTHOR]

The presence of polycyclic aromatic hydrocarbons (PAHs) in the soil is a major cause of concern due to their toxic nature and ubiquitous occurrence. As PAHs are hydrophobic substances, their solubility in water is very low. This makes them unfit for natural degradation. However, it has been found that several microorganisms have the capability to efficiently degrade soil-sorbed PAHs using different metabolic pathways. As the microbial degradation process is quite economical and does not cause ecological damage, it has been a subject of extensive research for the past several decades. In numerous studies, it has been found that a consortium of microbes is more effective than the individual microbial isolates. The process remains affected by different environmental factors. Therefore, in this article, the current status of the work done on various aspects of biodegradation of ecologically toxic PAHs using different microbial consortia has been reviewed along with the biological aspects of biosurfactants produced during the process. The role of recent technologies such as the next-generation sequencing using omics techniques, metagenomics and metatranscriptomics, has also been discussed. These technologies are critical in understanding the application of microbial consortium, including its potential for future bioremediation in microbial ecology. [ABSTRACT FROM AUTHOR]