Journal
ECOLOGICAL ENGINEERING
Volume 91, Issue -, Pages 310-316Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2016.02.039
Keywords
Constructed wetlands (CWs); Typha latifolia; Carbon source; Nitrate removal
Funding
- National Science Foundation of China [51578393, 50808135]
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In this study, a self-supplying carbon source constructed wetland (CW) was developed and evaluated. Both the effects of plants (Typha latifolia) and plant fermentation broth on nitrate removal were measured. The results showed that the addition of plant fermentation broth greatly improved the nitrate removal rate. As the ratio of added chemical oxygen demand to influent nitrate (CODAdd/NO3-N ratio) increased from 0 to 3, the nitrate removal rate attributed to the plants increased from 0.09 to 0.29 g N m(-3) d(-1), but the proportion of total nitrate removal decreased from 27.3% to 10.7%, and denitrification was always the dominant nitrate removal mechanism. Furthermore, there were strong positive correlations between the CODAdd/NO3-N ratio and the nitrate removal rate, both in unplanted (R-2=0.977) and planted (R-2=0.996) microcosms. Plant biomass could potentially support a nitrate removal rate of 0.05-0.54 g N m(-2) d(-1) in self-supplying carbon source CWs. (C) 2016 Elsevier B.V. All rights reserved.
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