Abstract
An
external aeration and intermittent circulation were used to improve the
nitrogen removal performance of subsurface flow constructed wetland
(SSF CW) in landscape garden ponds. Nitrification was the main mechanism
of ammonium–nitrogen (
)
removal and partial nitrification/anaerobic ammonia oxidation was a
minor process. Field measurements yielded a removal rate of
of 0.266–0.566 g N/d m
2 and a corresponding temperature-dependent rate constant of 0.184 d
−1 to 0.377 d
−1 representing an improvement over nitrogen removal. The nitrate–nitrogen (
) removal was degraded to the background level of
concentration in an environment with a high concentration of dissolved oxygen. The
removal rate ranged from 0.0393 g N/d m
2 to 0.0825 g N/d m
2
and resulted from aerobic denitrification, indicating that external
aeration and intermittent circulation effectively improved oxygen
transportation in SSF CW. This could remove
of the effluent of SSF CW when using in-tank aeration to improve the nitrogen removal performance of SSF CW.
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