1 of 2 Design Expectations Exceeded with TORAYFIL TM Ultrafiltration Membranes at Oliver-Mercer-North Dunn SYSTEM DESIGN The Oliver-Mercer-North Dunn (OMND) Drinking Water Treatment Plant (WTP) operates as part of the Southwest Pipeline Project (SWPP) to deliver a continuous supply of drinking water to communities in southwest North Dakota. OMND uses a two-stage ultrafiltration (UF) system with TORAYFILTM hollow-fiber UF membrane modules to treat surface water from Lake Sakakawea. The second stage treats backwash water from the first stage, and the product water from the second stage is returned to the head of the plant. The raw water quality of the UF feed is listed in Table 1. The UF filtrate is sent to a reverse osmosis (RO) system using ROMEMBRATM low-pressure membrane

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