Light as a possible regulator of MIB-producing Planktothrix in source water reservoir,mechanism and in-situ verification |
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| Institution: | 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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