MBBR Process Control Parameters
1. Temperature Control
The biofilm reactor system should operate within the optimal temperature range of 15-35°C.
2. Dissolved Oxygen (DO) Management
DO concentration critically affects organic removal efficiency, particularly for nutrient (N/P) removal applications. The recommended DO control ranges are:
- Anaerobic zone: <0.2 mg/L
- Anoxic zone: 0.2-0.5 mg/L
- Aerobic zone: ≥2.0 mg/L
3. Mixed Liquor Suspended Solids (MLSS)
The recommended MLSS concentration in MBBR aerobic zones should be maintained at 3,000-20,000 mg/L. Both excessively high and low concentrations impair system performance:
- High MLSS: Causes sludge deposition on biofilm carriers, forming thick sludge layers
- Low MLSS: Reduces degradation rates and weakens adsorption capacity for soluble organics
4. pH Regulation
The influent pH should be maintained between 6.0-9.0 for optimal biochemical processes.
MBBR Operational Process Control
1. Low Temperature Operation
- When influent temperature drops below 8°C:
✓ Reduce treatment capacity
✓ Extend hydraulic retention time to ensure complete organic degradation
2. Seasonal Variation Response
- Monitor effluent quality closely during temperature transition periods
- Implement corrective measures when detecting sudden water quality changes:
✓ Adjust treatment capacity
✓ Increase aeration duration
3. Toxic Substance Prevention
- Strictly avoid introduction of biocides/disinfectants that inhibit microbial metabolism
- Prevent disruption of microbial biological mechanisms that could degrade effluent quality
4. Foam Control
- For foam caused by surfactants or foaming agents:
✓ Use water spray systems for foam suppression
✗ Avoid oil-based defoamers
✗ Prohibit silicone-based defoaming agents
These control measures ensure stable MBBR operation while maintaining treatment efficiency under varying conditions.