title: Seasonal effects of pre-aeration on microbial processes for nitrogen removal in constructed wetlands.
abstract: Seasonal effects of pre-aeration on microbial nitrogen performance in constructed wetlands (CWs) involved with anaerobic ammonium oxidation (anammox) process were investigated in this study. Slow natural re-aeration rate was the inhibiting factor for total nitrogen removal in CW without pre-aeration, and partial nitrification was the main way for nitrite generation. Besides partial nitrification, pre-aeration provided nitrite generation in CWs with an alternative way: nitrate reduction. Advantage of pre-aeration of influent was much different under various temperature ranges. Mean temperature of 15 °C seemed to be the turning point. With a mean temperature of or higher than 15 °C, nitrate in the influent effectively improved nitrogen removal in CWs. With a mean temperature lower than 15 °C, the nitrate reduction process in CWs was greatly inhibited. The benefit of pre-aeration was weak under this temperature range. Seasonal aeration pattern for the pre-treatment of HSSF CWs might be a more energy-saving alternative in in-suit domestic sewage treatment.
authors.affiliation: Tongji University, Shanghai, 200092, People's Republic of China.
authors.forename: Ling
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, People's Republic of China. tianli_tj@163.com.
authors.forename: Tian
authors.initials: T
authors.lastname: Li
mesh_terms: D058440:Denitrification; D009566:Nitrates; D058465:Nitrification; D009573:Nitrites; D009584:Nitrogen / Q000737:chemistry* / Q000302:isolation & purification; D012621:Seasons; D013696:Temperature; D053833:Wetlands
chemical_list: D009566:Nitrates; D009573:Nitrites; D009584:Nitrogen
keywords: Anammox; Constructed wetland; Denitrification; Partial nitrification; Pre-aeration; Wastewater treatment