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.

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