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The Bacterial Community Structure in Biofilms of the RABC Process for Swine Butchery Wastewater Treatment  

Sung, Gi-Moon (Department of Microbiology, Graduate School, Daejeon University)
Lee, Dong-Geun (Department of Pharmaceutical Engineering, Silla University)
Park, Seong-Joo (Department of Microbiology, Graduate School, Daejeon University)
Publication Information
Korean Journal of Microbiology / v.47, no.1, 2011 , pp. 56-65 More about this Journal
Abstract
Culture-independent microscopic observations and 16S rDNA analyses were applied to describe the bacterial community inherent to the biofilm structure of the RABC (Rotating Activated Bacillus Contactors) process for swine butchery wastewater treatment. The ratios of Gram-positive bacterial counts to total bacterial counts of the RABC process were significantly increased in the last aeration tank as well as returned sludge, while those of the existing A2O (Anaerobic-Anoxic-Oxic) process maintained constant from aeration tanks to returned sludge. Totally nine phyla were recovered by 16S rDNA analysis, two of which were major groups: the Proteobacteria (64.1%) and the Actinobacteria (18.4%). The third major group was the endospore-forming Firmicutes (5.4%). The remaining six minor groups are the Bacteroidetes (3.3%), the Chlorobi (2.2%), the Nitrospirae (1.1%), the Chlorofleix (1.1%), the Acidobacteria (1.1%), and the Fusobacteria (1.1%). The ratio of endospore-forming bacteria was 19.4%, which was composed of the members of the Firmicutes phylum (5.4%) and the Intrasporangiaceae family (14.0%) of the Actinobacteria phylum. Nitrifying and denitrifying related- and phosphorus accumulating related-sequences were composed of 6.5% and 5.4% of total community, respectively, these could mean the high capacity of the RABC process to remove odor compounds and reduce eutrophication by efficient removing inorganic nutrients.
Keywords
16S rDNA; bacterial community structure; biofilm; endospore-forming bacteria; Rotating Activated Bacillus Contactors (RABC); swine butchery wastewater;
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