Nitrogen removal from polluted river by enhanced floating bed grown canna |
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| Authors: | Lianpeng Sun Yang Liu Hui Jin |
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| Institution: | 1. Department of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;2. Huizhou Environmental Science Institute, Huizhou, Guangdong 516001, China;1. Department of Biological and Agricultural Engineering, North Carolina State University, 3100 Faucette Drive, Raleigh, NC 27695, United States;2. City of Durham, NC Public Works Department, Stormwater Services, 101 City Hall Plaza, Durham, NC 27701, United States;1. School of Environmental Engineering, Xuzhou Institute of Technology, Xuzhou 221111, PR China;2. Jiangsu Provincial Key Laboratory of Palygorskite Science and Applied Technology, Huaiyin Institute of Technology, Huaian 223003, PR China;3. School of Environment Science and Spaitial Informatics China University of Mining and Technology, Xuzhou 221111, PR China;1. Coastal Environment Engineering Technology Research Center of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;2. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;1. School of Environmental Science and Engineering, Tianjin University, 300072, China;2. Tianjin Key Laboratory for Prevention and Control of Occupational and Environmental Hazard, Logistics University of Chinese People’s Armed Police Forces, Tianjin 300162, China |
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| Abstract: | Floating beds of canna can remove nitrogen from polluted river water, but the removal efficiency is not very high in a short time, so some enhanced methods must be used to improve nitrogen removal efficiency by the system. Immobilized denitrifying bacteria and aeration were added into the canna floating bed. The experimental results showed that these enhancements substantially improved the nitrogen removal efficiency of the floating beds. With the enhancements, total nitrogen removal was 72.1%, ammonia nitrogen oxidation was 100%, nitrate nitrogen removal was 75.8%, nitrite nitrogen removal was 95.9%, and COD removal was 94.6% in 5 days. Without the enhancements, the canna floating bed system removed only 50.4% of the total nitrogen, 22.4% of the nitrate nitrogen, 5.3% of the nitrite nitrogen and 39.9% of the COD, respectively, in 5 days, but did accomplish 100% oxidation of the ammonia nitrogen. The experimental results provide an improved method for the treatment of polluted river water. |
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