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| Preliminary investigation on the denitrification of reclaimed water intake area of the Chaobai River |
| Received:March 03, 2016 |
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| KeyWord:reclaimed water;denitrification;N2:Ar ratio method;N2 flux |
| Author Name | Affiliation | E-mail | | HE Bao-nan | Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China | | | HE Jiang-tao | Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China | jthe@cugb.edu.cn | | WANG Jian | East China University of Technology, Nanchang 330013, China | | | LI Jie | Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China | |
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| Abstract: |
| Monitoring points were set along reclaimed water supply path in intake area of the Chaobai River in Shunyi. N2:Ar ratio method and membrane introduction mass spectrometry(MIMS) were used to determine dissolved nitrogen directly, and then N2 fluxes on water-air interface were calculated. Based on these, N2 fluxes changing characteristics and controlling factors of NO3--N changes along the river were investigated, and then contributions of main factors in NO3--N transformation were estimated. The results showed that N2 fluxes in the Jian River and the Chaobai River were 8.92~15.20 mmol N2·m-2·d-1 and 17.07~33.01 mmol N2·m-2·d-1, respectively. Denitrification combined with assimilation of phytoplankton led to variation of NO3--N concentration at different parts of intake area. In the Jian River, nitrogen removal amounts caused by denitrification and phytoplankton were 0.041 mmol·L-1 and 0.017 mmol·L-1, accounting for 68.33% and 28.33% of total NO3--N changes, respectively. In the Chaobai River, the values were 0.254 mmol·L-1 and 0.125 mmol·L-1, accounting for 63.50% and 31.25%, respectively. |
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