title: The microorganism community in an aerobic denitrification membrane bioreactor by 16S rDNA based molecular biotechnology.
abstract: In this study, the performance and microbial community in a submerged membrane bioreactor were investigated for different hydraulic retention times. The removal efficiencies of chemical oxygen demand, total phosphorus, suspended solid and heterotrophic bacteria did not differ significantly with different hydraulic retention times but the total nitrogen removal efficiency increased when the hydraulic retention time increased. Aerobic denitrification occurred during the membrane bioreactor process at hydraulic retention time of 20 hours and Thiosphera pantotropha was identified as the aerobic denitrifier by the clone-denaturing gradient gel electrophoresis method. Another denitrifying Fe+2 oxidizing bacteria was also identified at hydraulic retention time of 20 hours. In contrast, no denitrifying bacteria were identified at hydraulic retention time of 5 hours.
authors.affiliation: Department of Bioenvironmental Engineering, Chung Yuan Christian University, Chungli 320, Taiwan.
authors.forename: S J
authors.initials: SJ
authors.lastname: You
mesh_terms: D001420:Bacteria, Aerobic / Q000235:genetics* / Q000502:physiology*; D019149:Bioreactors; D001709:Biotechnology; D004269:DNA, Bacterial / Q000032:analysis*; D008567:Membranes, Artificial; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements
chemical_list: D004269:DNA, Bacterial; D008567:Membranes, Artificial