Nitrite inhibition and intermediates effects on Anammox bacteria: A batch-scale experimental study |
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| Institution: | 1. Civil and Environmental Engineering Department, University of Florence, via S. Marta, 3, 50139 Florence, Italy;2. Publiacqua S.p.A., via Villamagna, 39, 59126 Florence, Italy;3. Biology Department, University of Pisa, via A. Volta 4/6, 56126 Pisa, Italy;1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China;2. Key Laboratory for Water Pollution Control and Environmental Safety, Zhejiang Province, Hangzhou 310058, PR China;3. Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore;1. Department of Environmental Science and Engineering, Hangzhou Normal University, Hangzhou 310036, China;2. Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, Hangzhou Normal University, Hangzhou 310036, China;3. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China;1. Dept. of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;2. School of Environment Science and Spatial Informatics, CUMT, Xuzhou 221116, China;3. Graduate School of Environmental studies, Tohoku university, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. Institute of Energy, Jiangxi Academy of Sciences, Nanchang 330096, China;1. Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, North-13, West-8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan;2. Department of Civil and Environmental Engineering, National Institute of Technology, Kure College, 2-2-11 Agaminami, Kure, Hiroshima 737-8506, Japan;3. Water Desalination and Reuse Center (WDRC), Biological and Environmental Science & Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;4. Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, 4-22-1, Ikeda, Nishi-ku, Kumamoto, Kumamoto 860-0082, Japan |
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| Abstract: | A batch test procedure, based on manometric measurements, was used to study the Anammox process, in particular the inhibition due to nitrite and the effects of hydroxylamine and hydrazine, indicated as possible intermediates of the process. The maximum nitrite removal rate (MNRR) was measured. The method showed good reliability with a standard error of 4.5 ± 3.3% (n: 41). All the tests were carried out on samples taken from a pilot plant with Anammox suspended biomass. The tests were used also to monitor the reactor activity. By testing different spiked additions of nitrite (10–75 mg NO2?-N L?1), a short-term inhibition, with more than 25% MNRR decrease, was found at concentrations higher than 60 mg NO2?-N L?1. Repeated additions of nitrite higher than 30 mg NO2?-N L?1 caused losses of activity. After a complete loss of activity, spiked additions of hydroxylamine (30 mg N L?1 in total) determined a 20% permanent recovery. Low amounts of the intermediates (1–3 mg N L?1) applied on partially inhibited samples and uninhibited samples produced temporary increases in activity up to 50% and 30%, respectively. |
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