Oxygen Fluxes and Ammonia Removal Efficiencies in Constructed Treatment Wetlands

Authors

Meiyin S Wu, Montclair State UniversityFollow
Eldon H. Franz, SUNY Albany
Shulin Chen, SUNY Albany

Document Type

Article

Publication Date

1-1-2001

Journal / Book Title

Water Environment Research

Abstract

Ammonia-removal efficiency in constructed wetlands is often limited by the amount of oxygen available in the system. In this study, the oxygen-transfer rates to laboratory-scale, subsurface-flow and free-water-surface constructed wetlands were quantified for two input concentrations of ammonia, 10 and 50 mg nitrogen/L, both with and without Typha latifolia. Rates of oxygen diffusion into the subsurface-flow constructed wetlands were 6.01 to 7.92 g/m2·d and were strongly correlated with ammonia concentration in the water. In contrast, low oxygen diffusion rates of 1.36 to 1.76 g/m2·d were observed for the free-water-surface system. The presence of Typha latifolia had small but consistent effects on atmospheric oxygen-diffusion rates and ammonia-removal efficiencies in both the subsurface-flow and free-water-surface systems. The observed small effects were consistent with measurements of oxygen inputs from T. latifolia roots. Only approximately 0.023 g/m2·d of oxygen was released from roots of T. latifolia, as measured using the titanium (III) citrate buffer method. The results for the ammonia-removal rates of the laboratory-scale constructed wetlands were further verified using pilot-scale constructed wetlands under greenhouse conditions.

DOI

10.2175/106143001X143394

Montclair State University Digital Commons Citation

Wu, Meiyin S; Franz, Eldon H.; and Chen, Shulin, "Oxygen Fluxes and Ammonia Removal Efficiencies in Constructed Treatment Wetlands" (2001). Department of Biology Faculty Scholarship and Creative Works. 47.
https://digitalcommons.montclair.edu/biology-facpubs/47

Published Citation

Wu, M.-Y., Franz, E.H. and Chen, S. (2001), Oxygen Fluxes and Ammonia Removal Efficiencies in Constructed Treatment Wetlands. Water Environment Research, 73: 661-666. https://doi.org/10.2175/106143001X143394