... promote sewage, oxygen, bio-film adequate mixing & stirring and keep bio-films Suspension Bio-filter:It is a new biofilm carrier ... Polymer. This carrier’s surface attaches number of hydrophilic group and Amino, carboxyl, Epoxy active group. Furthermore, it can form ... forms Fungi, filamentous bacteria, Zoogloea, but also forms protozoa and metazoan. Finally, it forms stable food chain. Forming biofilm ...