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Completely autotrophic nitrogen removal over nitrite in one single reactor
Water Research
|August 3, 2002
Summary
This study demonstrates a novel single-stage reactor for efficient autotrophic ammonia removal. The reactor successfully converts ammonia to nitrogen gas (N2) with minimal byproducts, eliminating the need for external carbon sources.
Area of Science:
- Environmental Microbiology
- Wastewater Treatment Technologies
- Biogeochemical Cycles
Background:
- Conventional ammonia removal often requires multiple stages and external carbon sources.
- Autotrophic nitrogen removal processes, like anaerobic ammonia oxidation (Anammox), offer sustainable alternatives.
- Developing integrated systems for complete autotrophic ammonia removal is crucial for efficient wastewater treatment.
Purpose of the Study:
- To investigate the microbiology and feasibility of a novel single-stage reactor for complete autotrophic ammonia removal.
- To assess the performance of the reactor under controlled oxygen limitation.
- To monitor the development and activity of microbial populations during operation.
Main Methods:
- Inoculation with Anammox biomass and subsequent introduction of oxygen.
- Monitoring microbial populations using Fluorescence In Situ Hybridization (FISH).
- Assessing microbial activity through off-line measurements and byproduct analysis.
Main Results:
- Successful development of a nitrifying population under oxygen-limiting conditions.
- Co-existence and activity of anaerobic ammonium-oxidizing bacteria (Anammox bacteria) at steady state.
- Ammonia primarily converted to N2 (85%), with minimal nitrate (15%) and negligible N2O production.
Conclusions:
- The single-stage reactor is feasible for complete autotrophic ammonia removal.
- The system effectively integrates nitrification and Anammox processes without aerobic nitrite-oxidizers.
- No external carbon source is required for efficient autotrophic denitrification to N2.