| Literature DB >> 23831745 |
Jinlin Fan1, Wengang Wang, Bo Zhang, Yeye Guo, Huu Hao Ngo, Wenshan Guo, Jian Zhang, Haiming Wu.
Abstract
The performance response of eight vertical flow constructed wetlands (VFCWs) to different influent COD/N ratios and intermittent aeration in domestic wastewater treatment was investigated. Almost complete nitrification was obtained by intermittent aeration, which well developed alternate anaerobic and aerobic conditions for nitrification and denitrification. Sufficient carbon source supply resulted from influent COD/N ratio of 10 simultaneously obtained high removals of COD (96%), ammonia nitrogen (99%) and total nitrogen (90%) in intermittently aerated VFCWs. In all non-aerated VFCWs, poor nitrification was observed due to oxygen deficiency whilst high COD/N ratios further led to lower COD and nitrogen removal efficiency. The results suggest that intermittent aeration combined with high influent COD/N ratios could achieve high nitrogen removal in VFCWs.Entities:
Keywords: COD/N ratio; Intermittent aeration; Nitrogen removal; Vertical flow constructed wetlands
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Year: 2013 PMID： 23831745 DOI： 10.1016/j.biortech.2013.06.038
Source DB: PubMed Journal: Bioresour Technol ISSN： 0960-8524 Impact factor: 9.642