Enhanced organics and nitrogen removal in batch-operated vertical flow constructed wetlands by combination of intermittent aeration and step feeding strategy

2012 ◽  
Vol 20 (4) ◽  
pp. 2448-2455 ◽  
Author(s):  
Jinlin Fan ◽  
Shuang Liang ◽  
Bo Zhang ◽  
Jian Zhang
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Feeding Strategy ◽  
Vertical Flow ◽  
Intermittent Aeration ◽  
Vertical Flow Constructed Wetlands

Increasing nitrogen removal efficiency by intermittent aeration in partial areas of laboratory-scale vertical flow constructed wetlands

2020 ◽  
Vol 71 (12) ◽  
pp. 1686
Author(s):  
Chen Chen ◽  
Nannan Zhang ◽  
Zhe Liu ◽  
Shuqing An ◽  
Dehua Zhao
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Amoa Gene ◽  
Laboratory Scale ◽  
Vertical Flow ◽  
Intermittent Aeration ◽  
Nitrate Reductase Gene ◽  
Partial Area ◽  
Reductase Gene

Intermittent aeration (IA) has been widely used in constructed wetlands (CWs) because it is economical and results in high nitrogen removal efficiency (RE). The aim of this study was to identify whether IA (4hday–1; the recommended frequency according to previous studies) in a partial area (PIA) can improve nitrogen RE compared with IA applied throughout the CW (TIA). Three types of laboratory-scale vertical flow CWs were constructed: PIA, TIA and non-aerated (NA). PIA achieved a higher RE of total nitrogen than TIA and NA (mean RE 60.6 v. 45.2 and 37.4% respectively). In the PIA, the ammonia mono-oxygenase subunit A (amoA) gene was abundant in aerated areas, whereas the nitrate reductase gene narG and nitrite reductase genes nirK and nirS were abundant in anaerobic areas. The results of this study suggest that PIA is an effective strategy for nitrogen removal when applying aeration in CWs because it preserves a constant anaerobic area for denitrification.

Combinations of Horizontal and Vertical Flow Constructed Wetlands to Improve Nitrogen Removal

2009 ◽  
Vol 9 (3-4) ◽  
pp. 279-286 ◽  
Author(s):  
Gilbert Kabelo Gaboutloeloe ◽  
Shulin Chen ◽  
Michael E. Barber ◽  
Claudio O. Stöckle
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands

Nitrogen removal in intermittently aerated vertical flow constructed wetlands: Impact of influent COD/N ratios

2013 ◽  
Vol 143 ◽  
pp. 461-466 ◽  
Author(s):  
Jinlin Fan ◽  
Wengang Wang ◽  
Bo Zhang ◽  
Yeye Guo ◽  
Huu Hao Ngo ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands
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