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Nitrogen removal via nitritation pathway for low-strength ammonium wastewater by adsorption, biological desorption and denitrification
- Source :
- Bioresource Technology. 267:541-549
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Stable nitritation for low-strength ammonium wastewater was the key obstacle for cost-effective and low-carbon biological nitrogen removal. A zeolite biological fixed bed (ZBFB) and an anoxic sequencing batch reactor (ASBR) were successfully applied for achieving nitritation-denitrification of low-strength ammonium wastewater by adsorption, biological desorption and denitrification. Based on free ammonia inhibition on biofilm, stable nitrite accumulation could be realized with suitable operational time and aeration in biological desorption. During cycle operation, adsorption effluent NH4+-N kept at 3.0–4.0 mg/L, biological desorption effluent NO2−-N maintained at 226.8–243.2 mg/L with average nitrite accumulation ratio of 97.18%, and nitrite removal rate was about 0.628–0.672 kg NO2−-N·m−3·day−1, revealing obvious feasibility of ZBFB and ASBR for low-strength ammonium wastewater treatment. High-throughput sequencing analysis results further presented significant microbial community variations happened after cycle operation, with ammonia oxidizing bacteria enrichment and nitrite oxidizing bacteria inhibition in ZBFB and dominance of denitrifiers in ASBR.
- Subjects :
- Environmental Engineering
Denitrification
Nitrogen
0208 environmental biotechnology
chemistry.chemical_element
Bioengineering
Sequencing batch reactor
02 engineering and technology
Wastewater
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Ammonia
Bioreactors
Ammonium Compounds
Ammonium
Nitrite
Waste Management and Disposal
Effluent
Nitrites
0105 earth and related environmental sciences
Renewable Energy, Sustainability and the Environment
General Medicine
020801 environmental engineering
chemistry
Environmental chemistry
Adsorption
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 267
- Database :
- OpenAIRE
- Journal :
- Bioresource Technology
- Accession number :
- edsair.doi.dedup.....87528e35ec523fa44ce065a1490051b6