Case Study – OMND Plant in North Dakota

This presentation will discuss the operation of a 6 MGD pressurized two-stage Ultrafiltration (UF) plant over a 3 year period at the Oliver-Mercer-North Dunn (OMND) Drinking Water Treatment Facility. The OMND Treatment Facility utilizes Ultrafiltration followed by low pressure Reverse Osmosis Softening to produce a blended Finished Water capacity of 5.2 MGD. The 6 MGD capacity of the UF system supplies the feed water for the softening system and a softening bypass system for a blended Finished Water consisting of 60% softening system product water and 40% UF Product water. The plant is located approximately 12 miles (20 kilometers) northwest of Beulah, North Dakota, USA and uses Missouri River water from the Lake Sakakawea reservoir as a source of supply. At the OMND Plant calculated LRV values are consistently greater than 4.5 log using the Darcy-Pipe model. Other conservative parameters were also used in the LRV calculations in determining the minimum test pressure required for detection of a 3 æm or smaller breach in the membrane surface. For the pore-shaped correction factor (?) the most conservative value of 1 was used. For the liquid – membrane contact angle (O) zero degrees was used as opposed to a measured contact angle.
Overall integrity performance of the plant will be discussed in detail, as well as Trans-Membrane Pressure (TMP), flux, temperature corrected permeability (specific flux) and cleaning efficiency for both the first and second UF stages will also be presented.

This presentation is available to AMTA Members only.