Properties of a new strain of Nitrosomonas isolated from an aerobic biofilm in a domestic sewage-treatment system |
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| Institution: | 1. Research and Development Division, Toto Ltd., Nakashima 2-1-1, Kokurakita-ku, Kitakyushu 802, Japan;2. Department of Industrial Chemistry, College of Science and Technology, Nihon University, 1-5 Kanda-Surugadai, Chiyoda-ku, Tokyo 101, Japan;1. Centro Nacional Patagónico (CENPAT-CONICET). Boulevard Brown 2915, U9120ACF Puerto Madryn, Chubut, Argentina;2. Universidad Nacional de la Patagonia San Juan Bosco, Puerto Madryn, Chubut, Argentina;3. Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Tucumán, Argentina;1. Department of Chemical Sciences, Ariel University, Israel;2. Department of Chemical Engineering, Biotechnology and Materials, Ariel University, Israel;3. Eastern Israel R&D Center, Ariel University, Israel;4. Natural Sciences Faculty, Physics Department, Ariel University, Israel;1. Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China;2. State Key Lab of Pulp and Paper Engineering, College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, China;3. Guangdong Institute of Microbiology, Guangzhou 510070, China |
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| Abstract: | A new ammonia-oxidizing strain, isolated from an aerobic biofilm in a domestic sewage-treatment system, was identified as a species of Nitrosomonas different from Nitrosomonas europaea. This strain had morphological features and growth characteristics typical of members of the genus Nitrosomonas. The G+C content of the DNA of this strain was 48.5 mol%, being lower than that of known strains of N. europaea. The extent of the homology between the DNA of this strain and that of other strains of N. europaea was less than 30%. After cells of this isolate, immobilized in a polyacrylamide gel, had been added to the aerobic reactor of a laboratory-scale sewage-treatment system, the concentration of ammonium nitrogen in the effluent decreased to 2 mg/l without the accumulation of nitrite, and removal of more than 70% of the nitrogen from the input sewage was achieved. |
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