Examination of oxygen release from plants in constructed wetlands in different stages of wetland plant life cycle |
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| Authors: | Jian Zhang Haiming Wu Zhen Hu Shuang Liang Jinlin Fan |
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| Institution: | 2. Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan, 250100, People’s Republic of China
1. College of Resources and Environment, Northwest A & F University, Xianyang, Shaanxi, 712100, People’s Republic of China
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| Abstract: | The quantification of oxygen release by plants in different stages of wetland plant life cycle was made in this study. Results obtained from 1 year measurement in subsurface wetland microcosms demonstrated that oxygen release from Phragmites australis varied from 108.89 to 404.44 mg O2/m2/d during the different periods from budding to dormancy. Plant species, substrate types, and culture solutions had a significant effect on the capacity of oxygen release of wetland plants. Oxygen supply by wetland plants was estimated to potentially support a removal of 300.37 mg COD/m2/d or 55.87 mg NH4-N/m2/d. According to oxygen balance analysis, oxygen release by plants could provide 0.43–1.12 % of biochemical oxygen demand in typical subsurface-flow constructed wetlands (CWs). This demonstrates that oxygen release of plants may be a potential source for pollutants removal especially in low-loaded CWs. The results make it possible to quantify the role of plants in wastewater purification. |
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