title: Nitrification performance and microbial ecology of nitrifying bacteria in a full-scale membrane bioreactor treating TFT-LCD wastewater.
abstract: This study investigated nitrification performance and nitrifying community in one full-scale membrane bioreactor (MBR) treating TFT-LCD wastewater. For the A/O MBR system treating monoethanolamine (MEA) and dimethyl sulfoxide (DMSO), no nitrification was observed, due presumably to high organic loading, high colloidal COD, low DO, and low hydraulic retention time (HRT) conditions. By including additional A/O or O/A tanks, the A/O/A/O MBR and the O/A/O MBR were able to perform successful nitrification. The real-time PCR results for quantification of nitrifying populations showed a high correlation to nitrification performance, and can be a good indicator of stable nitrification. Terminal restriction fragment length polymorphism (T-RFLP) results of functional gene, amoA, suggest that Nitrosomonas oligotropha-like AOB seemed to be important to a good nitrification in the MBR system. In the MBR system, Nitrobacter- and Nitrospira-like NOB were both abundant, but the low nitrite environment is likely to promote the growth of Nitrospira-like NOB.
authors.affiliation: Department of Environmental Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan. whang@mail.ncku.edu.tw
authors.forename: Liang-Ming
authors.initials: LM
authors.lastname: Whang
authors.forename: Yi-Ju
authors.initials: YJ
authors.lastname: Wu
authors.forename: Ya-Chin
authors.initials: YC
authors.lastname: Lee
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Chen
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Fukushima
authors.forename: Ming-Yu
authors.initials: MY
authors.lastname: Chang
authors.forename: Sheng-Shung
authors.initials: SS
authors.lastname: Cheng
authors.forename: Shu-Fu
authors.initials: SF
authors.lastname: Hsu
authors.forename: Cheng-Huey
authors.initials: CH
authors.lastname: Chang
authors.forename: Wason
authors.initials: W
authors.lastname: Shen
authors.forename: Chung Kai
authors.initials: CK
authors.lastname: Huang
authors.forename: Ryan
authors.initials: R
authors.lastname: Fu
authors.forename: Barkley
authors.initials: B
authors.lastname: Chang
mesh_terms: D000332:Aerobiosis; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D050866:Liquid Crystals / Q000382:microbiology*; D008567:Membranes, Artificial; D009566:Nitrates / Q000032:analysis; D058465:Nitrification; D009584:Nitrogen / Q000032:analysis; D010084:Oxidation-Reduction; D012150:Polymorphism, Restriction Fragment Length; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D060888:Real-Time Polymerase Chain Reaction; D012722:Sewage / Q000382:microbiology; D014173:Transistors, Electronic / Q000382:microbiology*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000382:microbiology; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D008567:Membranes, Artificial; D009566:Nitrates; D009584:Nitrogen; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D062065:Wastewater