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Effects of key enzyme activities and microbial communities in a flocculent-granular hybrid complete autotrophic nitrogen removal over nitrite reactor under mainstream conditions
- Source :
- Bioresource technology. 280
- Publication Year :
- 2018
-
Abstract
- Recently, a flocculent-granular hybrid reactor was reported as a novel nitrogen removal system; however, the mechanisms of stable operation in the system remain unclear. In this study, the mechanisms of the stable nitrogen removal performance in a flocculent-granular hybrid system were investigated with temperature reduction. The operational period was divided into three phases with different temperatures ranges. In phase I, the nitrogen removal efficiency was stabilized at about 90% with nitrogen removal load maintained at approximately 0.28 kg N/(m3·day). In phase II, while decreasing the temperature to 20 °C, the activities of key enzymes were reduced immediately and were then maintained at a certain level. The relative abundances of aerobic ammonium-oxidizing bacteria and anaerobic ammonium-oxidizing bacteria gradually increased at this phase. In phase III, after the temperature dropped to 15 °C, the activities of key enzymes gradually increased due to adaptation to low temperature, boosting the nitrogen removal efficiency to 83%.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Denitrification
Nitrogen
Microorganism
chemistry.chemical_element
Bioengineering
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Bacteria, Anaerobic
Bioreactors
010608 biotechnology
Ammonium Compounds
Hybrid reactor
Ammonium
Nitrite
Waste Management and Disposal
Nitrites
0105 earth and related environmental sciences
Autotrophic Processes
Sewage
Renewable Energy, Sustainability and the Environment
Microbiota
Temperature
Flocculation
General Medicine
chemistry
Anammox
Environmental chemistry
Anaerobic exercise
Oxidation-Reduction
Subjects
Details
- ISSN :
- 18732976
- Volume :
- 280
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....f82dea6ce61d9256a8f2872083e63624