Advantages of MBBR biofilter media of different shapes

MBBR (Moving Bed Biofilm Reactor) biofilter medias come in a variety of shapes, each with unique advantages.
Cylindrical fillers
Good fluidity: Cylindrical fillers have excellent fluidity in MBBR units. When aerated or stirred, they are able to roll freely in the reaction tank, allowing microorganisms to fully and evenly contact the sewage. This rolling motion prevents microorganisms from growing too thick on the surface of the filler, which causes internal hypoxia, and is beneficial to the metabolism of aerobic microorganisms. For example, when treating sewage with a high concentration of organic matter, the rolling of cylindrical fillers can ensure that microorganisms continue to obtain sufficient oxygen and pollutants, improving the removal efficiency of chemical oxygen demand (COD).

Large specific surface area: The cylindrical shape can provide a relatively large specific surface area. Microorganisms can attach to the sides and ends of the cylinder, increasing the attachment space for microorganisms. This is very beneficial for cultivating a rich microbial community, and can accommodate a variety of microorganisms that play a key role in sewage treatment, such as nitrifying bacteria and denitrifying bacteria, thereby effectively performing denitrification treatment.

Spherical fillers
Uniform force and fluidization: Spherical fillers are uniformly stressed in the fluid, and both the rising airflow generated by aeration and the water flow caused by stirring can enable them to achieve a good fluidization state in the reaction tank. This uniform fluidization can reduce the collision and friction between fillers, reduce the wear rate of fillers, and extend their service life. In long-term MBBR devices, this feature helps to maintain a stable treatment effect.

Efficient mass transfer performance: The shape of the sphere makes it have less resistance in the sewage, which is conducive to the diffusion of pollutants and oxygen in the sewage into the filler. The curvature of its surface can guide water and air flow and promote material exchange. For some pollutants that are difficult to degrade, this mass transfer advantage of spherical fillers can accelerate the decomposition rate of microorganisms and improve the efficiency of sewage treatment.

Flake or corrugated fillers
Increase contact area and interception effect: Flake or corrugated fillers have a large plane area and can form a multi-layer structure in the reaction tank. When sewage flows through, this structure can increase the contact area between sewage and fillers, and at the same time have a good interception effect on pollutants such as suspended matter and colloids in sewage. It acts like a filter, giving pollutants more opportunities to be decomposed by microorganisms. When treating sewage containing more suspended matter, such as papermaking wastewater, this filler can effectively remove suspended matter while allowing microorganisms to degrade organic pollutants.

Provide different microbial growth environments: The multi-layer structure of sheet or corrugated fillers provides different growth environments for microorganisms. At different levels, microorganisms can form different community distributions based on factors such as light, water flow rate, and oxygen concentration. For example, in areas close to the surface of sewage flow, aerobic microorganisms may dominate; while in some hidden areas inside the filler, an environment suitable for the growth of anaerobic microorganisms may be formed. This diverse microbial environment helps to treat sewage more comprehensively, such as performing aerobic and anaerobic reactions at the same time, and improving the removal of nutrients such as nitrogen and phosphorus in sewage.

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