How to choose suitable MBBR filter media

1. Material characteristics
Chemical stability:
Choose a filler material with good chemical stability, which can remain stable in different sewage environments and does not react with chemicals in sewage. For example, materials such as polyethylene and polypropylene have excellent acid resistance, alkali resistance, and corrosion resistance, and are suitable for treating various types of sewage.
Avoid choosing materials that are easily corroded by chemicals in sewage, so as to prevent the filler from being gradually damaged during use, affecting the treatment effect and service life.
Abrasion resistance:
Since the filler is in a fluidized state in the MBBR reactor, it will rub against other fillers, reactor walls, etc., so it is necessary to choose a material with good wear resistance. For example, high-strength polyethylene fillers have good wear resistance and can maintain the integrity of shape and structure during long-term operation.
You can understand the wear resistance of the filler by checking the material manual of the filler, consulting the manufacturer, or referring to actual application cases.
Biological affinity:
The filler material should have good biological affinity, which is conducive to the attachment and growth of microorganisms. Some material surfaces have a certain degree of roughness and pore structure, which can provide more attachment sites for microorganisms and promote the formation and growth of biofilms.
For example, polyethylene fillers with microporous structures can increase the attachment area of ​​microorganisms, increase the biomass and activity of biofilms, and thus enhance the sewage treatment effect.

2. Shape and size
Shape selection:
MBBR biofiltration fillers have a variety of shapes, such as cylindrical, spherical, irregular, etc. Fillers of different shapes may differ in fluidization performance, specific surface area, biofilm growth speed, etc.
Cylindrical fillers usually have good fluidization performance and mechanical strength, and are suitable for use in larger reactors; spherical fillers have a higher specific surface area and uniform water flow distribution, which is conducive to the growth and mass transfer of microorganisms; irregularly shaped fillers may have more pore structures and can provide more biological attachment sites.
Select fillers of appropriate shapes according to actual application requirements and the characteristics of the reactor.
Size:
The size of the filler will also affect its performance. Generally speaking, smaller-sized fillers have a larger specific surface area and can provide more biological growth space, but may cause increased fluidization resistance and require higher aeration intensity. Larger-sized fillers are the opposite, with better fluidization performance but a relatively small specific surface area.
Generally, the diameter of MBBR filler is between 10 and 30 mm. When selecting the filler size, it is necessary to comprehensively consider factors such as the size of the reactor, water flow rate, aeration intensity, etc. to ensure that the filler can be well fluidized in the reactor and provide sufficient biological growth area.

3. Specific surface area and porosity
Specific surface area:
Specific surface area is one of the important indicators to measure the performance of fillers. A larger specific surface area means more microbial attachment sites and can accommodate more biomass, thereby improving the sewage treatment effect.
Generally speaking, the specific surface area of ​​MBBR biofiltration fillers should be above 300-800 square meters/cubic meters. You can understand its specific surface area by checking the product manual of the filler or performing actual measurements.
Porosity:
Porosity refers to the ratio of the volume of pores inside the filler to the total volume. A higher porosity is conducive to the passage of water flow and the transfer of oxygen, providing a good growth environment for microorganisms.
Porosity should generally be above 80%. The porosity can be determined by observing the appearance structure of the filler or performing a porosity test.

4. Price and supply stability
Price factors:
Consider the price cost of the filler and select a reasonably priced filler on the premise of meeting the treatment requirements. The prices of fillers of different materials, shapes and specifications may vary greatly. You can choose a cost-effective filler by comparing the prices and performance of products from different manufacturers.
At the same time, the service life and replacement cost of the filler should also be considered to comprehensively evaluate the long-term operating costs.
Supply stability:
Ensure a stable and reliable supply of fillers to avoid affecting the normal operation of the sewage treatment plant due to supply interruptions. Select manufacturers with good reputation and stable production capacity, and sign long-term supply contracts to ensure the timely supply of fillers.
You can understand the manufacturer's production scale, market share, after-sales service, etc., and evaluate its supply stability.

If you want to know how to choose MBBR biofiltration fillers, you can contact BioCell Environmental Technology, we will do our best to help you!

https://www.biocell-enviro.com/