How to prevent MBBR filter media loss?

Install appropriate flow diversion devices at the reactor inlet and outlet to ensure even water distribution and prevent localized high flow velocities from impacting the filter media. Install interception devices at the outlet, such as precision screens or meshes, with pore sizes smaller than the filter media particle size, to create a physical barrier that prevents the filter media from flowing out with the effluent while ensuring smooth passage of wastewater and minimizing water flow obstruction.

Choose a filter media material with a density close to that of water and high strength to reduce the risk of media floating and overflowing due to low density or breaking and losing due to insufficient strength. Ensure the filter media has a regular shape to avoid excessive corners or irregular shapes that could cause blockage or excessive scouring during flow, thus maintaining the integrity of the filter media.

Control the agitation intensity or aeration level within the reactor to ensure uniform fluidization of the filter media. Avoid excessive agitation or aeration that could cause violent water flow impacting the filter media. Adjust operating parameters promptly based on changes in wastewater volume to prevent sudden increases in water volume, which could lead to a sudden increase in water velocity and carryover of filter media.

Regularly inspect the interception devices within the reactor and remove impurities and biofilm adhering to the gratings or screens to prevent blockages that could cause water flow obstruction and localized high pressure that could dislodge the filter media. Regularly inspect the reactor structure and promptly repair any gaps or damage to prevent filter media from leaking through these holes.

For areas prone to filter media loss, add guide plates or baffles within the reactor to direct filter media flow and reduce accumulation at the outlet. Control the fill level appropriately based on the filter media's characteristics to avoid overfilling, which could cause the filter media to squeeze and overflow, or underfilling, which could cause the filter media to be carried away by the water flow.