Suspended Ball
Media

The suspended ball media is a uniformly shaped, porous rotating spherical packing. The sphere is moulded from PP or PE and with several regular or irregular internal cavities, so it keeps dynamic equilibrium in water. The outer mesh shell and an optional inner bio-carrier (for example polyurethane sponge) give a large protected surface for biofilm growth.

Key characteristics:

1. Spherical or granular, generally regular, with high porosity and large specific surface area.
2. Relative density close to water (slightly above or below 1); once covered with biofilm the media move with the flow — driven by aeration in aerobic tanks and mechanical agitation in anoxic/anaerobic reactors.
3. Made of polyethylene, polypropylene or polyurethane plastic/resin; some surfaces are specially treated to promote microbial attachment.
4. No agglomeration or clogging — aged biofilm detaches automatically under hydraulic scour and aeration agitation.
5. High mass-transfer efficiency with no additional energy.

Advantages: when used in biological treatment the residual sludge yield is low, refractory substances are removed well, nitrogen and phosphorus removal is efficient and the media also intercept suspended solids. No fixing or hanging is required — simply place them in the treatment unit, which is convenient, easy to replace and reduces installation and operating workload.