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Performance and bacterial communities in unsaturated and saturated zones of a vertical-flow constructed wetland with continuous-feed
- Source :
- Bioresource technology. 315
- Publication Year :
- 2020
-
Abstract
- In this study, a partially-saturated vertical-flow constructed wetland (VFCW) with continuous-feed was operated to investigate nutrients transformation and possible pathways in unsaturated and saturated zones. Effect of temperature on nutrients removal and microbial community was also evaluated. The variation of temperature barely affected removal of NH4+-N and COD, achieving removal efficiencies of 99.5–100.0% and 96.8–100.0% at effluent temperature of 14.9–27.7 °C. The removal of COD, NH4+-N, total inorganic nitrogen (TIN) and total phosphorus mainly occurred in unsaturated zone, achieving much higher removal rates than saturated zone. Nitrification process in the VFCW was associated with autotrophic/heterotrophic ammonia oxidizing bacteria and nitrite oxidizing bacteria. Denitrification process relied on both autotrophic and heterotrophic denitrifiers. Anaerobic ammonium oxidizing bacteria was also detected, contributing to TIN removal. All of the groups for nutrients removal exhibited higher abundance in unsaturated zone. Diverse pathways co-existed for nitrogen removal, while the main metabolic pathways were different along the depth.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Nitrogen
Bioengineering
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Nutrient
Bioreactors
010608 biotechnology
Oxidizing agent
Ammonium
Autotroph
Nitrite
Waste Management and Disposal
Effluent
0105 earth and related environmental sciences
Bacteria
Renewable Energy, Sustainability and the Environment
General Medicine
Nitrification
chemistry
Environmental chemistry
Wetlands
Constructed wetland
Denitrification
Subjects
Details
- ISSN :
- 18732976
- Volume :
- 315
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....9afd660c51deefe1f2d9c9a2be06691c