Evaluation Criteria for MBBR Media
By: Kate Nana
Post Date: August 20th, 2025
Email:Kate@aquasust.com
Post Tags: MBBR, Secondary Wastewater Treatment, MBBR System，Moving Bed Biofilm Reactor (MBBR)
1. Biofilm Adhesion Capacity (Key Performance Indicator)
- Biofilm attachment capacity = Protected surface area (determined by media design) × Biofilm attachment per unit area (media property-dependent)
2. Surface Characteristics
a) Surface Texture
- Rough surfaces demonstrate faster biofilm formation rates
b) Surface Charge
- Optimal microbial growth occurs when media surface exhibits positive charge (microorganisms typically carry negative charge)
c) Hydrophilicity
- Hydrophilic media surfaces promote microbial attachment as microorganisms are hydrophilic particles
3. Hydraulic Properties
a) Porosity
- Higher porosity media is preferred (greater protected volume)
b) Geometry
- Shape and dimensions significantly influence hydraulic/airflow patterns
c) Fluidization Characteristics
- Optimal specific gravity range: 0.97-1.03 g/cm³
- Achieves effective fluidization with minimal aeration/mixing energy
4. Biofilm Maturation Assessment
Visual Inspection Criteria:
- Uniform biofilm distribution on media surface
- Increasing biofilm density toward media core
- Darkening media coloration
Microscopic Examination Criteria:
- Dense biofilm structure
- Diverse microbial population
- Dominance of sessile ciliates (Vorticella, Epistylis)
- Presence of rotifers and free-swimming ciliates
- Appearance of higher trophic organisms indicates mature biofilm
Note: These parameters collectively determine media performance in MBBR systems, affecting treatment efficiency, operational stability, and energy requirements.
How to Optimize Secondary Wastewater Treatment? Aquasust Is Your Ideal Partner.
✅We specialize in delivering high-quality, low-cost, low-maintenance solutions.
✅Facing challenges in selecting from numerous MBBR media options? Rest assured!
✅Contact us to discuss your specific requirements. We will precisely match the optimal media specifications for your application, ensuring peak treatment performance.
