title: Microbial community analysis of an aerobic nitrifying-denitrifying MBR treating ABS resin wastewater.
abstract: A two-stage aerobic membrane bioreactor (MBR) system for treating acrylonitrile butadiene styrene (ABS) resin wastewater was carried out in this study to evaluate the system performance on nitrification. The results showed that nitrification of the aerobic MBR system was significant and the highest TKN removal of approximately 90% was obtained at hydraulic retention time (HRT) 18 h. In addition, the result of nitrogen mass balance revealed that the percentage of TN removal due to denitrification was in the range of 8.7-19.8%. Microbial community analysis based on 16s rDNA molecular approach indicated that the dominant ammonia oxidizing bacteria (AOB) group in the system was a β-class ammonia oxidizer which was identified as uncultured sludge bacterium (AF234732). A heterotrophic aerobic denitrifier identified as Thauera mechernichensis was found in the system. The results indicated that a sole aerobic MBR system for simultaneous removals of carbon and nitrogen can be designed and operated for neglect with an anaerobic unit.
authors.affiliation: Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, Tainan 717, Taiwan. mcychang@mail.chna.edu.tw
authors.forename: Chia-Yuan
authors.initials: CY
authors.lastname: Chang
authors.forename: Kulchaya
authors.initials: K
authors.lastname: Tanong
authors.forename: Jia
authors.initials: J
authors.lastname: Xu
authors.forename: Hokyong
authors.initials: H
authors.lastname: Shon
mesh_terms: D000180:Acrylic Resins / Q000138:chemical synthesis*; D000332:Aerobiosis; D001419:Bacteria / Q000235:genetics*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D002070:Butadienes / Q000138:chemical synthesis*; D004275:DNA, Ribosomal / Q000235:genetics; D058440:Denitrification; D004587:Electrophoresis, Agar Gel; D007220:Industrial Waste / Q000032:analysis; D008567:Membranes, Artificial; D058465:Nitrification; D009584:Nitrogen / Q000032:analysis; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D011137:Polystyrenes / Q000138:chemical synthesis*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D000180:Acrylic Resins; D002070:Butadienes; D004275:DNA, Ribosomal; D007220:Industrial Waste; D008567:Membranes, Artificial; D011137:Polystyrenes; C024636:ABS resin; D009584:Nitrogen