Abstract
A tidal unsaturated constructed wetland (CWTU) was proposed to improve the oxygen supplement and ammonia oxidation without high energy consumption of aeration. A siphon effluent tube was imported in CWTU to form the tidal discharge, expose part substrate into air, and supply oxygen to the biofilm and the thin wastewater film on the surface of substance during wastewater treatment process. The results showed that NH4+-N removal rates in CWTUs ranged from 42.76% to 61.17%, much higher than that in conventional non-aeration CWNA (25.25%). The addition of hydrophilic material and COD in CWTU further improved nitrogen removal from 24.72% to 30.92%. Seen from the spatial distribution of pollutants and the relative functional gene abundance of bacteria community, it could be concluded that the tidal unsaturated section near the inlet played an important role in nitrogen removal. Increasing organic carbon supply was proposed to improve the denitrification function of the constant saturated section of CWTUs.
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