Related Experiment Videos
Nitrite accumulation by aeration controlled in sequencing batch reactors treating domestic wastewater
1College of Environmental and Energy Engineering, Beijing University of Technology, Chaoyang District, Beijing, China 100022. pyz@bjut.edu.cn
Summary
Stable nitrite accumulation is achievable in Sequencing Batch Reactors (SBRs) for domestic wastewater treatment. Real-time control of dissolved oxygen (DO) and pH enables efficient nitritation, optimizing nitrogen removal processes.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Microbial Ecology
Background:
- Nitrite accumulation is a key step in biological nitrogen removal.
- Sequencing Batch Reactors (SBRs) offer flexibility in wastewater treatment processes.
- Controlling aeration is crucial for directing ammonium oxidation pathways.
Purpose of the Study:
- To investigate the feasibility of stable nitrite accumulation in SBRs treating domestic wastewater.
- To evaluate the effectiveness of different aeration strategies on nitritation.
- To determine the role of dissolved oxygen (DO) and pH as control parameters.
Main Methods:
- Operation of two parallel SBRs with distinct aeration control strategies.
- Utilizing on-line indirect measurements of DO and pH.
- Monitoring nitrogen species (ammonium, nitrite, nitrate) concentrations.
Main Results:
- Stable long-term nitritation was achieved in one SBR at 32°C using a specific aeration control strategy.
- DO and pH were identified as reliable real-time control parameters for nitritation.
- An alternate aeration control strategy was necessary during the acclimation phase.
Conclusions:
- Real-time aeration control based on DO and pH facilitates stable nitrite accumulation in SBRs.
- Optimized aeration strategies are essential for successful nitritation in domestic wastewater treatment.
- SBRs are a viable technology for achieving controlled nitrogen removal through nitritation.