Technical Bulletin 171 PTFE Coated EPDM Diffuser Membranes: Benefits and Limitations
Membrane diffuser technology has become the standard for high efficiency transfer of oxygen into wastewater. This difficult service has utilized many materials for membrane construction with premium low oil EPDM having emerged as one of the most reliable materials throughout the industry. Even premium EPDM can occasionally experience difficulty or failure so search for the perfect membrane continues. Several alternates to EPDM have performed well in specific sites but to date premium EPDM is the clear standard for efficiency, economies, and life.
One of the specialty membranes promoted over the past few years is “PTFE (best known brand name Teflon®) Membranes”. This product has great market appeal as everyone knows PTFE is resistant to even severe operating conditions in household use (eggs on frying pan etc.). Why not make a PTFE membrane and solve all membrane diffuser problems? This program had been pursued and “PTFE Membranes” are currently being marketed for diffusers as a solution to all membrane problems. What does an analysis of this product actually suggest?
EDI recommends each project be reviewed for membrane technology! Our 40 year history with membrane technology suggests premium EPDM is a superior choice for most municipal wastewaters and many industrial projects. Evaluation of membrane types can be helpful when test rigs can be installed with real field data accumulated.
EDI considers the PTFE thin coated membrane a viable specialty membrane product and available for applications when the material has demonstrated benefits. EDI does not promote this product as superior to EPDM or polyurethane standard products without data or customer preference to employ PTFE coated EPDM membranes as insurance policy.
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