Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/198804
Type: Artigo de periódico
Title: Investigation Of Bacterial Diversity In Membrane Bioreactor And Conventional Activated Sludge Processes From Petroleum Refineries Using Phylogenetic And Statistical Approaches.
Author: Silva, Cynthia C
Jesus, Ederson C
Torres, Ana P R
Sousa, Maira P
Santiago, Vânia M J
Oliveira, Valéria M
Abstract: Bacterial diversity of two distinct wastewater treatment systems, conventional activated sludge (CAS) and membrane bioreactor (MBR), of petroleum refineries were investigated through 16S rRNA gene libraries. Sequencing and phylogenetic analysis showed that the bacterial community composition of sludge samples was distinct between the two wastewater treatment systems. MBR clones belonged predominantly to Class Betaproteobacteria, represented mainly by genera Thiobacillus and Thauera, whereas CAS clones were mostly related to Class Alphaproteobacteria, represented by uncultured bacteria related to Order Parvularculales. Richness estimators ACE and Chao revealed that the diversity observed in both libraries at the species level is an underestimate of the total bacterial diversity present in the environment and further sampling would yield an increased observed diversity. Shannon and Simpson diversity indices were different between the libraries and revealed greater bacterial diversity for the MBR library, considering an evolutionary distance of 0.03. LIBSHUFF analyses revealed that MBR and CAS communities were significantly different at the 95% confidence level (P< or =0.05) for distances 0< or =D< or =0.20. This work described, qualitatively and quantitatively, the structure of bacterial communities in industrial-scale MBR and CAS processes of the wastewater treatment system from petroleum refineries and demonstrated clearly differentiated communities responsible for the stable performance of wastewater treatment plants.
Subject: Base Sequence
Biodegradation, Environmental
Bioreactors
Dna, Bacterial
Extraction And Processing Industry
Genetic Variation
Industrial Waste
Molecular Sequence Data
Petroleum
Phylogeny
Polymerase Chain Reaction
Proteobacteria
Rna, Ribosomal, 16s
Sequence Alignment
Sewage
Waste Disposal, Fluid
Water Pollutants, Chemical
Rights: aberto
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/20372011
Date Issue: 2010
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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