MBBR Nitrogen Removal Optimization
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- Kate nana
- Issue Time
- Nov 7,2025
Summary
When the nitrogen removal efficiency in the MBBR (Moving Bed Biofilm Reactor) process is low, performance can be improved through the following adjustments:
By: Kate Nana
Post Date: November 7th, 2025
Email:Kate@aquasust.com
Post Tags: MBBR, Secondary Wastewater Treatment, MBBR System，Moving Bed Biofilm Reactor (MBBR)
When the nitrogen removal efficiency in the MBBR (Moving Bed Biofilm Reactor) process is low, performance can be improved through the following adjustments:
1. Sludge Age Optimization
Biofilm sludge age: 40–70 days
Suspended sludge age: 5–10 days
Recommended approach:
Keep the A²/O stage at 15 days sludge age for effective nitrogen removal.
Use biofilm in the MBBR stage to extend the overall sludge age and achieve simultaneous nitrogen and phosphorus removal.
2. Temperature Control
When water temperature falls below 20°C, nitrification rate drops significantly.
At 10°C, the nitrification rate decreases by 62%.
Optimization measures:
Maintain temperature at 25–35°C with heating equipment.
Under low temperature, extend sludge age by 20–30% to sustain microbial activity.
3. Dissolved Oxygen (DO) Control
Recommended DO level: 2–3 mg/L.
Excessive DO (> 4.5 mg/L) leads to sludge aging and a 45% reduction in sludge stability.
Solution: Adjust aeration precisely to maintain optimal DO levels.
4. Carbon Source Addition
When temperature is below 20°C, add a carbon source (e.g., sodium acetate) to enhance denitrification.
Field data shows nitrogen removal efficiency increases by approximately 40% after carbon supplementation.
Key Takeaways:
Segmented sludge age control
Stable temperature maintenance
Accurate DO management
Proper carbon source dosing
Efficient nitrogen removal starts with precise MBBR process control.