Performance indicators of MBBR biofilter media

1. Specific surface area
Specific surface area is the core indicator of MBBR biofilter media performance. The larger the value, the wider the effective area for microorganisms to attach. It is like a spacious "living space" that can accommodate more microorganisms to "live and work in peace and contentment". Generally, the specific surface area of ​​high-quality MBBR biofilter media can reach 200-800m²/m³, which provides a basis for the large-scale reproduction of microorganisms, greatly enhances the ability to decompose and transform various pollutants in sewage, and thus improves the efficiency and quality of sewage treatment.

2. Porosity
Porosity is related to the proportion of the total volume of pores inside the filter media in its total volume. High-porosity filter media is like a "maze" with many connections, which is conducive to the smooth flow of water and the free flow of air, greatly promoting mass transfer efficiency. At the same time, the rich pores create a safe and suitable habitat for microorganisms and create good conditions for their metabolism. Generally speaking, the porosity of ideal MBBR biofilter media is in the range of 60%-90%.

3. Density
The density of the filter media plays a decisive role in its fluidization state in the water. When the MBBR process is running, the filter media needs to be fluidized under aeration or stirring and fully contact with the sewage. The filter media with a density of 0.95-1.05g/cm³ can remain moderately suspended in the water, neither sinking easily nor floating excessively, ensuring that it can be evenly dispersed in the water body and efficiently participate in the sewage treatment process.

4. Hydrophilicity
The filter media with good hydrophilicity is like having a strong "attraction", which can quickly come into close contact with water and accelerate the attachment and growth of microorganisms on its surface. When the surface of the filter media is quickly infiltrated by water, the microorganisms can "take root" faster, shorten the system startup time, get the sewage treatment work on track faster, and stably exert the purification efficiency.

5. Mechanical strength
During the long-term sewage treatment process, the filter media will be subjected to mechanical forces such as water flow impact and aeration stirring. The filter media with high mechanical strength can effectively resist wear and tear, ensure its structural integrity, extend service life, reduce replacement frequency, reduce operating costs, and ensure the continuous and stable operation of the MBBR process.

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