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Effects of hydraulic loading rate and substrate on ammonium removal in tidal flow constructed wetlands treating black and odorous water bodies
- Source :
- Bioresource technology. 321
- Publication Year :
- 2020
-
Abstract
- The efficient removal of ammonium nitrogen (NH4+-N) is vital to eliminating black and odorous water bodies. In this work, tidal flow constructed wetlands with gravel (TFCW-G) and with a mixture of zeolite and gravel (TFCW-Z) were set up to treat black and odorous water bodies at different hydraulic loading rates (HLRs). Results showed that zeolite significantly enhanced nitrogen removal, and the maximum NH4+-N removal efficiency of 96.69% was achieved in TFCW-Z at HLR of 3 m·d−1 with a flooding and drying cycle of 2 h. Zeolite addition changed the microbial community structure and the abundance of nitrification genes. Comammox Nitrospira was the only enriched strain accounting for NH4+-N removal in TFCW-G, while the co-occurrence of comammox Nitrospira and the canonical and potential ammonia-oxidizing bacteria were identified in TFCW-Z. Summarily, high performance, together with low footprint and low maintenance cost, are characteristics that make the TFCW-Z a promising and competitive alternative.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Nitrogen
Bioengineering
Wetland
010501 environmental sciences
01 natural sciences
Waste Disposal, Fluid
chemistry.chemical_compound
010608 biotechnology
Ammonium Compounds
Substrate (aquarium)
Ammonium
Zeolite
Waste Management and Disposal
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
biology
Renewable Energy, Sustainability and the Environment
Water
General Medicine
Comammox
Pulp and paper industry
biology.organism_classification
Microbial population biology
chemistry
Wetlands
Denitrification
Environmental science
Nitrification
Nitrospira
Subjects
Details
- ISSN :
- 18732976
- Volume :
- 321
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....b2ebe03ff1be9bbc5a648da6e2b8e0f7