A novel tidal unsaturated constructed wetland for high-efficiency nitrogen removal of wastewater based on the oxygen regulation
| Autor: | Lin-Lan Zhuang, Jian Zhang, Song Xiran |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Pollutant
Environmental Engineering Denitrification Renewable Energy Sustainability and the Environment 020209 energy Bioengineering 02 engineering and technology 010501 environmental sciences 01 natural sciences Ammonia chemistry.chemical_compound Wastewater chemistry Environmental chemistry 0202 electrical engineering electronic engineering information engineering Constructed wetland Environmental science Sewage treatment Aeration Waste Management and Disposal Effluent 0105 earth and related environmental sciences |
| Zdroj: | Bioresource Technology Reports. 10:100410 |
| ISSN: | 2589-014X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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