Journal
BIORESOURCE TECHNOLOGY
Volume 314, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123759
Keywords
Constructed wetlands; Nitrogen removal; Coupling mechanisms
Funding
- Water Pollution Control and Control of Major National Science and Technology Projects in China [2018ZX07110005]
- National Key Research and Development Project of China [2019YFC0409202]
- National Natural Science Foundation of China [51679001]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51721006]
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Nitrogen removal through microorganisms is the most important pathway in constructed wetlands (CWs). In this review, we summarize the microbial coupling mechanisms of nitrogen removal, which are the common methods of nitrogen transformation. The electron pathways are shortened and consumption of oxygen and energy is reduced during the coupling of nitrogen transformation functional microorganisms. The highly efficient nitrogen removal mechanisms are cultivated from the design conditions in CWs, such as intermittent aeration and tidal flow. The coupling of microorganisms and substrates enhances nitrogen removal mainly by supplying electrons, and plants affect nitrogen transformation functional microorganisms by the release of oxygen and exudates from root systems as well as providing carriers for microbial attachment. In addition, inorganic elements such as Fe, S and H act as electron donors to drive the autotrophic denitrification process in CWs.
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