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The influence of ammonium-nitrogen on the specific activity of pelletized methanogenic sludge |
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| Affiliation: | 1. Advanced Water Management Centre, The University of Queensland, Brisbane, 4072, QLD, Australia;2. Centre for Solid Waste Bioprocessing, Schools of Civil and Chemical Engineering, The University of Queensland, 4072, QLD, Australia;1. Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet Bygning 115, 2800 Kgs. Lyngby, Denmark;2. Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower, Singapore 138602, Singapore;3. Department of Biology, University of Padua, 35131 Padua, Italy;1. School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China;2. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China;3. Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China;1. Biomass Energy and Environmental Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China;2. Department of Biological & Agricultural Engineering, University of California, Davis, CA 95616, USA |
| Abstract: | The influence of ammonium-nitrogen concentrations in the range 680–2601 mg litre−1 on the specific activity of pelletized methanogenic sludge was investigated in batch experiments. A discontinuous linear negative correlation was found between ammonium-nitrogen concentration and methane production rate. The slope of the discontinuous correlation changed sharply at an ammonium-nitrogen concentration in the range 1600–1700 mg litre−1. The reversibility of the effect of ammonium-nitrogen was shown in a continuously fed experiment using an Upflow Anaerobic Sludge Blanket (UASB) reactor.Some proof was gathered for the hypothesis that acetate-consuming methanogenic bacteria are more strongly affected by ammonium-nitrogen than hydrogen-consuming methanogenic bacteria. In gradually increasing ammonium-nitrogen concentration the methanogenic sludge can adapt to ammonium-nitrogen concentrations above 1700 mg litre−1 without the occurrence of a lag-phase. |
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