ph and Mg/Ca control for biological treatment of an offensive flavour (2-MIB) |
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| Affiliation: | 1. Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China;2. Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, Guangdong, China;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;2. School of the Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China;3. Civil and Environmental Engineering, Duke University, Durham 27708-0287, USA;4. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;1. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China;2. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China;3. Department of Bioproducts and Biosystems Engineering, University of Minnesota, Saint Paul, MN, 55108, United States;4. Shenzhen Shenshui Baoan Water Group Co., Ltd., Shenzhen, 518000, China;1. Department of General Chemistry, Belarusian State Medical University, Dzerzinskogo, 83, Minsk, Belarus;2. Laboratory of Cellular Technologies, Institute of Physiology of the National Academy of Sciences of Belarus, Academicheskaya, 28, Minsk, Belarus |
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| Abstract: | From a series of experimental observations, it was found that removal rates of the offensive flavor 2-methylisoborneol(2-MIB) and ammonia by a biological treatment for water supply were rather unstable and that the removal rates of them often became reverse such as low removal in 2-MIB and high removal of ammonia. One reason for the reverse phenomenon was found that the affinities of sludge around bacteria with 2-MIB and ammonia often became reversed. The affinities of sludge with 2-MIB and ammonia were found to be changeable depending upon pH along with magnesium (Mg) and calcium (Ca) concentrations in sludge. From these findings, control of pH and magnesium calcium ratio (Mg/Ca) of raw water was recommended for simultaneous and stable removal of 2-MIB and ammonia. From plant scale experiments equipped with automatic pH controller, the effects of pH and Mg/Ca control for biological treatment of 2-MIB and ammonia were observed in a biological activated filtration. Here, a biological activated carbon filtration means a longer filtration than 40 to 50 days from the beginning. The obtained results were almost as expected, showing high removal rates of both 2-MIB and ammonia. |
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