title: Nitrogen removal in intermittently aerated vertical flow constructed wetlands: impact of influent COD/N ratios.
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.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.
authors.forename: Jinlin
authors.initials: J
authors.lastname: Fan
authors.forename: Wengang
authors.initials: W
authors.lastname: Wang
authors.forename: Bo
authors.initials: B
authors.lastname: Zhang
authors.forename: Yeye
authors.initials: Y
authors.lastname: Guo
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.forename: Wenshan
authors.initials: W
authors.lastname: Guo
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Haiming
authors.initials: H
authors.lastname: Wu
mesh_terms: D000332:Aerobiosis; D000388:Air; D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D009584:Nitrogen / Q000737:chemistry* / Q000302:isolation & purification*; D053833:Wetlands
chemical_list: D009584:Nitrogen
keywords: COD/N ratio; Intermittent aeration; Nitrogen removal; Vertical flow constructed wetlands