Light as a possible regulator of MIB-producing Planktothrix in source water reservoir,mechanism and in-situ verification |
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| Affiliation: | 1. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People''s Republic of China;2. University of Chinese Academy of Science, Beijing, 100049, People''s Republic of China;3. Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, People''s Republic of China;4. Department of Ecology and Evolutionary Biology, School of Biological Science, The University of Adelaide, SA 5005 Australia;1. Environment and Climate Change Canada, Canada Centre for Inland Waters, 867 Lakeshore Road, Burlington, ON L7S 1A1, Canada;2. Healthscope Pathology, 1 Goodwood Road, Wayville, SA 5034, Australia;3. South Australian Water Corporation, 250 Victoria Square, Adelaide, SA 5000, Australia;1. Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, PR China;2. Department of Environmental Analysis, Faculty of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308, Poland;1. Key Laboratory of Algal Biology, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People’s Republic of China;2. University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China;3. Tianjin Hydraulic Research Institute, Tianjin 300061, People’s Republic of China;4. College of Life Sciences, Jiangxi Normal University, Nanchang, Jiangxi, People’s Republic of China;1. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China;2. University of Chinese Academy of Sciences, Beijing, China;3. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China;1. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Department of Mathematical Sciences, Tsinghua University, Beijing, 100084, China;4. College of Environmental Science & Engineering, Yancheng Institute of Technology, Yancheng, 224051, China |
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| Abstract: | The typical musty/earthy odor-causing compound, 2-methylisoborneol (MIB), is usually associated with the occurrence and proliferation of benthic/subsurface-living cyanobacteria in source water. Control of MIB-producing cyanobacteria in source water may greatly reduce the processing burden for drinking water treatment plants. We explored the mechanism and feasibility of restricting the growth of subsurface-living Planktothrix sp. by reducing underwater light availability. The effects of light intensity (5, 17, 36, 85, and 250 μmol photons m−2 s−1) on the growth and MIB production of Planktothrix sp. were first determined using batch culture, followed by an in-situ experiment deployed at different depths (0.5, 1.5, 3.5, and 5.0 m) in a drinking source water reservoir (Miyun Reservoir, China) to verify the laboratory results. The optimum conditions for growth (7.5 × 108 cells L−1) and MIB production ((1300 ± 29) μg L−1) of Planktothrix sp. were achieved at 85 μmol photons m−2 s−1 in the laboratory and at 1.5 m (the corresponding average light intensity of 66 μmol photons m−2 s−1) in the field. The minimum light requirement for the growth of Planktothrix sp. (4.4 μmol photons m−2 s−1) was determined according to the laboratory data. While the in-situ experiment further indicated that Planktothrix sp. could not successfully grow at depths of 5 m where light intensity was below the minimum light requirement. In addition, the history data also verified the negative relationships between underwater light availability and MIB concentration. |
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| Keywords: | Light intensity Subsurface cyanobacteria 2-Methylisoborneol |
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