AWWA MTC64624

This slide presentation outlines the start-up experiences at two Minneapolis Water Works filtration plants, Columbia Heights and Fridley. Both have conventional pretreatment and the key ultrafiltration features of both include: Warm Water Capacity = ~ 70 mgd; Cold Water Capacity = ~ 40 mgd; 36 UF Units; UF membrane by Norit / Xflow; UF equipment by GE Ionics; and, Pressure (TMP) = 5 to 12 psid (max 15); flux adjusted by feed water temperature - Constant Flux, Units in rotating stand-by for low flow; Cleaning Methods - Water Backwash (no air), Chemically Enhanced Backwash (CEB), Dose, Soak (no recirculation); and Enhanced CEB. Topics covered include: operation of the membrane filter, preparing for start-up/operation; construction issues; membrane loading; Preservative Removal & Flushing; disinfection; testing of the control system and the membrane system; hydraulic issues; wet commissioning without membranes; membrane integrity; acceptance testing; cleaning methods; permeability; fiber breakage; and, full scale results. Includes figures.