期刊
ECOLOGICAL ENGINEERING
卷 64, 期 -, 页码 285-290出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2013.12.036
关键词
Integrated vertical constructed wetland (IVCW); Nitrification intensity; Nitrifying bacteria; Denitrifying bacteria; Oxygen concentration at the surface of plant roots
资金
- Major Science and Technology Program for Water Pollution Control and Treatment [2012ZX07104-001]
- Fundamental Research Funds for the Central Universities [2012ZYT5033]
Constructed wetlands are continuously being developed due to their cost effectiveness and ecological characteristics. A pilot-scale integrated vertical constructed wetlands (IVCWs) system was implemented for the treatment of primary domestic wastewater from student dorms in a university to investigate the nitrogen transformation properties. The removal efficiency of the total nitrogen of the pilot system ranged from 22.9% to 35.8%, i.e., there was insufficient denitrification in the wetland system. The maximum nitrification intensities of the media in the down-flow wetland and the up-flow wetland of the IVCW were 0.065 mg/(kg h) and 0.06 mg/(kg h), respectively. The nitrification intensity of the media in the rhizosphere of plants was significantly higher than that in the non-rhizosphere (13< 0.01). Larger numbers of the ammonia-oxidizing bacteria and nitrite-oxidizing bacteria were observed in the rhizosphere than in the non-rhizosphere in all the wetland cells, while the numbers of denitrifying bacteria exhibited the profiles contrary to those of the ammonia-oxidizing bacteria and nitrite-oxidizing bacteria. The nitrogen bacteria exhibited temperature-related patterns. The maximum oxygen concentrations at the surface of the roots offuncus effusus could reach 106 mu mo1/1. The differences between the nitrification intensity, the numbers of bacteria in the rhizosphere and the numbers in the non-rhizosphere were attributed to the oxygen-secretion capacity of the plant roots. (C) 2013 Elsevier B.V. All rights reserved.
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