Abstract:
:Constructed wetland (CW) for wastewater treatment has attracted increasing attention. In this review, the system configuration optimization, purification effect and general mechanisms of nitrogen removal in CW are systematically summarized and discussed. Ammonia oxidation is a crucial and primary process for total nitrogen (TN) removal in domestic or livestock wastewater treatment. Aeration, waterdrop influent and tidal operation are three main methods to strengthen the oxygen supplement and nitrification process in CW. Aeration significantly increases the ammonia removal rate (almost 100%), followed by the removal of chemical oxygen demand (COD) and TN. Solid carbon source, iron and anode material can be filled as electron donor for the denitrification process. The co-adjustment of oxygen and carbon/electron donor can form different conditions for different nitrogen removal pathways (e.g. the simultaneous nitrification-denitrification, the partial nitrification-denitrification and the anammox process), and achieve the optimal removal of nitrogen.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Zhuang LL,Yang T,Zhang J,Li Xdoi
10.1016/j.biortech.2019.122086subject
Has Abstractpub_date
2019-12-01 00:00:00pages
122086eissn
0960-8524issn
1873-2976pii
S0960-8524(19)31316-1journal_volume
293pub_type
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