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« Previous AbstractEvaluation of dispersion methods for enumeration of microorganisms from peat and activated carbon biofilters treating volatile organic compounds    Next AbstractBiodegradation of vapor-phase toluene in unsaturated porous media: Column experiments »

J Appl Microbiol


Title:Link between spatial structure of microbial communities and degradation of a complex mixture of volatile organic compounds in peat biofilters
Author(s):Khammar N; Malhautier L; Degrange V; Lensi R; Godon JJ; Fanlo JL;
Address:"Laboratoire Genie de l'Environnement Industriel, Ecole des Mines d'Ales, Ales cedex, France"
Journal Title:J Appl Microbiol
Year:2005
Volume:98
Issue:2
Page Number:476 - 490
DOI: 10.1111/j.1365-2672.2004.02474.x
ISSN/ISBN:1364-5072 (Print) 1364-5072 (Linking)
Abstract:"AIMS: To investigate the relationships between the operation of the volatile organic compound (VOC) removal biofilter and the structure of microbial communities, and to study the impact on degradation activities and the structuring of microbial communities of biofilter malfunctions related to the qualitative composition of the polluted air. METHODS AND RESULTS: A microbiological study and a measurement of biodegradation activities were simultaneously carried out on two identical peat-packed columns, seeded with two different inocula, treating polluted air containing 11 VOCs. For both reactors, the spatial structure of the microbial communities was investigated by means of single-strand conformation polymorphism (SSCP) analysis. For both reactors, stratification of degradation activities in function of depth was observed. Oxygenated compounds were removed at the top of the column and aromatics at the bottom. Comparison of SSCP patterns clearly showed a shift in community structure in function of depth inside both biofilters. This distribution of biodegradation activities correlates with the spatialization of microbial density and diversity. Although the operating conditions of both reactors were identical and the biodegradation activities similar, the composition of microflora differed for biofilters A and B. Subdivision of biofilter B into two independent parts supplied with polluted air containing the complex VOC mixture showed that the microflora having colonized the bottom of biofilter B retained their potential for degrading oxygenated compounds. CONCLUSIONS: This work highlights the spatialization of biodegradation functions in a biofilter treating a complex mixture of VOCs. This distribution of biodegradation activities correlates with the spatialization of microbial density and diversity. SIGNIFICANCE AND IMPACT OF THE STUDY: This vertical structure of microbial communities must be taken into consideration when dealing with the malfunctioning of bioreactors. These results are also useful information about changes in microbial communities following natural or anthropogenic alterations in different ecosystems (soils and sediments) where structuring of microbial communities according to depth has been observed"
Keywords:"*Air Microbiology *Air Pollution *Bacteria Biodegradation, Environmental Bioreactors Filtration *Soil;"
Notes:"MedlineKhammar, N Malhautier, L Degrange, V Lensi, R Godon, J-J Fanlo, J-L eng Research Support, Non-U.S. Gov't England 2005/01/22 J Appl Microbiol. 2005; 98(2):476-90. doi: 10.1111/j.1365-2672.2004.02474.x"

 
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