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- Title
Nitrogen removal in wood chip combined substrate baffled subsurface-flow constructed wetlands: impact of matrix arrangement and intermittent aeration.
- Authors
Li, Huai; Chi, Zifang; Yan, Baixing; Cheng, Long; Li, Jianzheng
- Abstract
In this study, two lab-scale baffled subsurface-flow constructed wetlands (BSFCWs), including gravel-wood chips-slag and gravel-slag-wood chips, were operated at different intermittent aeration to evaluate the effect of artificial aeration and slow-released carbon source on the treatment efficiency of high-strength nitrogen wastewater. Results indicated that gravel-slag-wood chips extended aerobic/anaerobic alternating environment to gravel and slag zones and maintained anaerobic condition in the subsequent wood chip section. The order of gravel-slag-wood chip was more beneficial to pollutant removal. Sufficient carbon source supply resulted from wood-chip-framework substrate simultaneously obtained high removals of COD (97%), NH -N (95%), and TN (94%) in BSFCWs at 2 h aeration per day. The results suggest that intermittent aeration combined with wood chips could achieve high nitrogen removal in BSFCWs.
- Subjects
NITROGEN removal (Sewage purification); WOOD chips; BIOCHEMICAL substrates; WETLANDS; WATER aeration; POLLUTANTS
- Publication
Environmental Science & Pollution Research, 2017, Vol 24, Issue 5, p5032
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-016-8227-3