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Strategies for enhanced deammonification performance and reduced nitrous oxide emissions
Carmen Leix1, Jörg E Drewes1, Liu Ye2
1Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Bioresource Technology
|April 14, 2017
Summary
Optimizing deammonification requires balancing nitrogen removal and nitrous oxide (N2O) emissions. This study found no single operational point maximizes performance while minimizing N2O, indicating a trade-off exists.
Area of Science:
- Environmental Science
- Wastewater Treatment Engineering
- Biotechnology
Background:
- Deammonification is a key wastewater treatment process.
- Operational conditions significantly impact deammonification performance and nitrous oxide (N2O) emissions.
- Previous research often focused on optimizing either performance or emissions separately.
Purpose of the Study:
- To investigate simultaneous optimization of deammonification performance and reduction of N2O emissions.
- To develop predictive models for nitrogen removal rate and N2O emissions under varying operational conditions.
- To identify optimal operational parameters for single-stage deammonification.
Main Methods:
- Employed a design of experiments (DoE) approach.
- Developed two predictive models for nitrogen removal rate and N2O emissions.
- Investigated the influence of pH, feeding strategy, and aeration strategy on deammonification.
Main Results:
- The emission factor ranged from 0.7±0.5% to 4.1±1.2% across different conditions.
- Maximized nitrogen removal was predicted at pH 7.46 with intermittent feeding and aeration.
- Minimized N2O emissions were predicted at pH 7.80 with single feeding and continuous aeration.
Conclusions:
- A weak positive correlation exists between nitrogen removal rate and N2O emissions.
- A single operational set-point for simultaneously maximizing performance and minimizing emissions was not identified.
- Operational adjustments are necessary to balance deammonification efficiency and N2O mitigation.