The Passavant® BIOFLEX tube diffuser is designed to provide efficient fine-bubble aeration for biological treatment processes. When air is introduced, the slits in the flexible membrane open and release thousands of micro-bubbles into the wastewater. Upon stopping the airflow, the membrane seals tightly against the support tube, preventing water ingress into the aeration system.

This double-sealing mechanism allows for safe and reliable intermittent operation, offering greater flexibility compared to ceramic diffusers. The system can be adapted for a variety of process conditions by selecting EPDM or silicone membranes, depending on the wastewater composition. The silicone variant is particularly resistant to fouling from fats, oils, and industrial compounds.

With its modular design, the diffuser can be easily mounted onto rectangular distribution pipes and integrated into new or existing aeration grids. BIOFLEX combines high oxygen transfer rates with low energy consumption, ensuring stable and effective performance in both municipal and industrial applications.