Dynamics of the Functional Structure of the Sediment Microflora During the Model Process of Phenol Biodegradation

Sofia University “St. Kliment Ohridski”, Department “General and Applied Hydrobiology”, Faculty of Biology, BG – 1164 Sofia, Bulgaria


Lincheva, S., I. Schneider and Y. Topalova, 2013. Dynamics of the functional structure of the sediment microflora during the model process of phenol biodegradation. Bulg. J. Agric. Sci., Supplement 2, 19: 139–142


The biodegradation of the toxic compound phenol in the sediments from the storage reservoir to HEPP “Lakatnik”, situated in the Iskar River was simulated in the laboratory model process. Phenol at a concentration of 200 mg.l–1 was the investigated xenobiotic. The following microbial and chemical indicators characterized the process: the amount of the key functional groups of microorganisms – aerobic heterotrophic bacteria, anaerobic heterotrophic bacteria,g.Pseudomonas, g.Acinetobacter andreduction of the residual phenol, mg.l–1. The dynamics of microorganisms showed greater changes after 72 hours of the process. All investigated microbial groups quickly adapted to the amount of 200 mg.l–1 phenol. The results confirmed that at the end of the process the phenol concentration decreased up to 69%. This result can be used in the decision-making at risk situations associated with increased concentration of phenol in the sediments.

Key words: Functional microbial diversity, phenol biodegradation, sediments
Abbreviations: АH – aerobic heterotrophic bacteria, AnH – anaerobic heterotrophic bacteria, HEPP – Hydroelectric Power Plants, Ps. – g. Pseudomonas, Ac.g. Acinetobacter

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