期刊
WATER RESEARCH
卷 64, 期 -, 页码 32-41出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.06.035
关键词
Constructed wetland (CW); Tidal flow; C/N ratio; Functional gene; Nitrogen transformation; Quantitative response relationship
资金
- National Key Technology R&D Program of China [2012BAJ25B01]
- National Natural Science Foundation of China [51179001]
- Jilin Province Transportation Science and Technology Projects [2011-1-7]
- Collaborative Innovation Center for Regional Environmental Quality
The present study explored treatment performance and nitrogen removal mechanisms of a novel tidal flow constructed wetland (TF CW) under C/N ratios ranging from two to 12. High and stable COD (83-95%), NH4+ - N (63-80%), and TN (50-82%) removal efficiency were simultaneously achieved in our single-stage TF CW without costly aeration. Results showed that a C/N ratio exceeding six was required to achieve complete denitrification without NO2- - N and NO3- - N accumulation in the system. Molecular biological analyses revealed aerobic ammonia oxidation was the dominant NH4+ - N removal pathway when the C/N ratio was less than or equal to six. However, when the C/N ratio was greater than six, anammox was notably enhanced, resulting in another primary NH4+ - N removal pathway, in addition to the aerobic ammonia oxidation. Quantitative response relationships between nitrogen transformation rates and nitrogen functional genes were established, and these relationships confirmed that different nitrogen transformation processes were coupled at the molecular level (functional genes), and collaboratively contributed to nitrogen removal in the TF CW. Specifically, NH4+ N transformation rates were collectively determined by amoA, nxrA, anammox, narG, nirS, nirK, and nosZ; and TN removal was influenced primarily by amoA and anammox. (C) 2014 Elsevier Ltd. All rights reserved.
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