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Partial nitrification in sequencing batch reactors treating low ammonia strength synthetic wastewater
Summary
Partial nitrification in wastewater treatment is best achieved by controlling aeration duration, leading to higher nitrite accumulation. However, high carbon-to-nitrogen ratios can cause sludge bulking and increase nitrogen loss.
Area of Science:
- Environmental Science
- Environmental Engineering
- Wastewater Treatment
Background:
- Nitrification is a key process in wastewater treatment for removing ammonia.
- Partial nitrification offers advantages but requires careful control.
- Understanding the influence of operational parameters is crucial for optimizing nitrogen removal.
Purpose of the Study:
- To investigate the transition from full to partial nitrification in sequencing batch reactors.
- To compare strategies for establishing partial nitrification: aeration duration control versus process parameter control.
- To evaluate the effect of carbon-to-nitrogen (C/N) ratios on nitrite accumulation and nitrogen loss.
Main Methods:
- Utilized sequencing batch reactors (SBRs) with synthetic wastewater.
- Manipulated C/N ratios (0.5, 1.5, 3.0) and employed two distinct strategies for partial nitrification.
- Conducted nitrogen mass balance analyses to quantify nitrogen transformations and losses.
Main Results:
- Aeration duration control proved more effective for establishing partial nitrification, yielding higher nitrite accumulation.
- Increased C/N ratios promoted nitrite accumulation but led to non-filamentous sludge bulking at high ratios.
- Nitrogen loss was significantly higher during partial nitrification compared to full nitrification, influenced by dissolved oxygen and C/N ratio.
Conclusions:
- Controlling aeration duration is a superior strategy for achieving partial nitrification and high nitrite accumulation in SBRs.
- Optimizing C/N ratio is essential to balance nitrite accumulation and prevent sludge bulking.
- Dissolved oxygen and C/N ratio are critical factors affecting nitrogen loss during nitrification processes.
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