HYDROPHOBIC PTFE MEMBRANE, HYDROPHOBIC PTFE MEMBRANE WITH SUPPORT MATERIAL, PRODUCTION METHOD OF TREATING LIQUID, SELECTION METHOD OF ACTIVATED SLUDGE AND FILTRATION MEMBRANE IN MEMBRANE SEPARATION ACTIVATED SLUDGE METHOD, INHIBITING METHOD OF FOULING IN MEMBRANE SEPARATION ACTIVATED SLUDGE METHOD AND TREATING METHOD OF TREATING OBJECT LIQUID

摘要

PROBLEM TO BE SOLVED: To provide a flat membrane for a membrane separation activated sludge method: where fouling is inhibited; and which has chemical durability withstanding cleaning by a chemical agent and physical durability to aeration (air bubbling and ventilation) and the like.SOLUTION: A hydrophobic polytetrafluoroethylene (PTFE) flat membrane having an average pore diameter of 0.01-5 m and an average thickness of 5-200 m is used for the filtration of a treating liquid obtained by purification treatment using activated sludge having a relative hydrophobicity measured by a BATH method of 30-100% in a membrane separation activated sludge method.