Investigation into ammonia stress on Cyperus alternifolius and its impact on nutrient removal in microcosm experiments

Journal of Environmental Management
Wendong TaoHanyan Li

Abstract

Ammonia stress on plants has been investigated at discrete ammonia concentrations in constructed wetlands. This study introduced a Gaussian model to simulate the kinetics of ammonia stress and investigated reversible and irreversible ammonia stress on Cyperus alternifolius in wetland-like microcosms. Ammonia stress on plant weight increase and oxygen release potential started at weekly ammonia concentrations of 27 and 28 mg N/L, reached 50% inhibition at 178 and 158 mg N/L, and resulted in lethal effects at 311 and 303 mg N/L, respectively. The stress of one-time ammonia concentrations up to 400 mg N/L could be reversible. Ammonia concentrations constantly above 219 mg N/L exerted irreversible stress. In the microcosms with ammonia concentrations above the 50% inhibition levels, plants played a minor role in nitrogen removal. Nitrogen removal performance was not affected considerably by ammonia stress. Orthophosphate removal was suppressed by ammonia stress due to less plant uptake. Design and operation of constructed wetlands should consider wastewater ammonia concentration so that the integrity of constructed wetland ecosystems can be maintained.

References

Nov 3, 2006·The Science of the Total Environment·Jan Vymazal
May 18, 2012·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mengjing XiaYuansheng Pei
Sep 17, 2013·Water Science and Technology : a Journal of the International Association on Water Pollution Research·C H SimK H Goh

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Citations

Oct 29, 2018·Environmental Science and Pollution Research International·Wendong Tao

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