Biodegradation of Benzene and Toluene by Streptomyces Species Isolated From the Soil of Tabriz Refinery, Eastern-Azerbaijan and Investigation of the Kinetic Model

Authors

1 Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran

2 Department of Engineering, Faculty of Engineering, Islamic Azad University Ahar Branch, Ahra, Iran

3 Biotechnology Department, East Azerbaijan Research and Education Center Agricultural and Natural Resources, AREEO, Tabriz, Iran

Abstract

Aromatic hydrocarbons are an important group of environmental pollutants which are produced from different sources such as refineries and petrochemical, pharmaceutical, paint, and plastics industries. These environmental pollutants can be removed by different methods such as evaporation, chemical degradation, biological degradation, and adsorption. Biological methods are preferred selective methods because of simplicity, utilization of environmental-friendly microorganisms, and production of safe materials such as water and carbon dioxide (Singh et al. 2007). Bioremediation is a process for the conversion of toxic materials into non-toxic and safe ones based on metabolic activity of microorganisms capable of using organic and petroleum pollutants as carbon and energy sources. It is a useful technology with no environmental disruption (Sungpetch, 1998). Streptomyces species, which belong to the category of Actinomycetes, are gram-positive and non-moving strains. Most of them produce spores and produce most of clinically useful antibiotics of natural origin. These species have different genus and some of them can degrade aromatic compounds such as benzene, toluene, and even complex petroleum compounds (Claessen et al. 2006).

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