Bioset Biofilm Filling Materials

Bioset media for biofilms: description and operation

Bioset filling materials consist of an alternating series of flat and/or corrugated PVC sheets bonded together to provide a lightweight, strong and rigid structure. Such modules are thus self-supporting and capable of bearing high loads. These structures provide a high active surface area for bacterial growth in a relatively small volume. Clearances are large enough to avoid abnormal bacterial accumulation, which could cause clogging of the filter.

The thermoformed sheets prevent free fall of the slurry evenly distributed on its top while facilitating its flow by wetting the entire useful surface with a uniform, thin film.

The percolating liquid flow is vertical or cross-current type, and it is prevented from dripping liquid directly through the entire module. Additional corrugations have been built into the molded sheets to allow easier rooting of biomass and increase local turbulence that promotes oxygen exchange between air and slurry. The slurry, containing organic residues, is lapped by a naturally circulating air flow thus providing the necessary elements for the development of bacteria on the surface of the fill.

Because of its modular structure and relatively low weight it can be easily handled, stored and installed in the tower. For supplies to distant countries it can also be transported in unglued sheets and its assembly can be carried out on site by machines easily operated even by unskilled personnel.