Hydrophilicity of MBBR biofilter media

The hydrophilicity of MBBR (Moving Bed Biofilm Reactor) biofilter media has a multi-faceted promoting effect on microbial metabolism.

Enhancing microbial attachment
Wet surface environment: The surface of biofilter media can remain moist, which provides a good initial attachment environment for microorganisms. Microbial cells usually contain a large amount of water, and the affinity between the hydrophilic surface and microbial cells is strong, making it easier for microorganisms to settle on the filler surface. For example, the cell wall components and extracellular polymers (EPS) of bacteria contain many hydrophilic groups, which can form hydrogen bonds and other interactions with the surface of hydrophilic fillers to promote bacterial adhesion. Moreover, this moist environment helps microorganisms to attach to the filler surface for a long time and stably, reducing the situation where microorganisms fall off due to adverse factors such as drying.

Conducive to the formation of microbial communities: Biofilter medias are conducive to the aggregation of multiple microorganisms, thereby promoting the formation of microbial communities. The mutual cooperation between different microorganisms plays a key role in sewage treatment. When microorganisms gather on the surface of hydrophilic fillers, they can cooperate with each other through co-metabolism and other means. For example, some microorganisms can decompose complex organic matter and convert it into simple small molecules that can be used by other microorganisms, thus forming an efficient metabolic network and improving the overall sewage treatment capacity.

Improve material exchange
Accelerate the absorption of nutrients: Biofilter media can accelerate the diffusion of nutrients in sewage to microorganisms. Due to the high affinity of hydrophilic surfaces with water, sewage can spread better on the surface of fillers. This makes it easier for organic matter, nitrogen, phosphorus and other nutrients in sewage to contact microorganisms and be absorbed and utilized by microorganisms. For example, when treating sewage containing high concentrations of organic pollutants, hydrophilic fillers can enable organic molecules to reach the surface of microbial cells faster, providing sufficient substrates for microbial metabolism, thereby increasing the rate of microbial decomposition and metabolism of organic matter.

Promote the excretion of metabolites: Microorganisms produce various metabolites during metabolism, such as carbon dioxide and organic acids. Hydrophilic fillers help these metabolites to be excreted from the area around microbial cells in a timely manner. If the metabolites cannot be excreted in time, they will accumulate around the microorganisms, which may have toxic effects on the microorganisms or change local environmental conditions, inhibiting the metabolism of microorganisms. Hydrophilic fillers can promote water flow and material exchange, allowing these metabolites to quickly diffuse into the surrounding sewage, maintain a good microenvironment around microbial cells, and ensure the continued metabolic activities of microorganisms.

Stabilize the living environment of microorganisms
Buffering environmental changes: Biofilter media can buffer the impact of changes in sewage quality and hydraulic conditions on microorganisms to a certain extent. For example, when the sewage flow suddenly increases or the water quality fluctuates, hydrophilic fillers can use their good interaction with water to make the microenvironment in which microorganisms live relatively stable. It can absorb and store a certain amount of water to prevent microorganisms from being damaged by short-term water shortages, and at the same time reduce the shedding of microorganisms caused by factors such as water flow impact, providing a relatively stable living space for the normal metabolism of microorganisms.
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