Full Description

The City of Minneapolis' 70-MGD Columbia Heights Membrane Filtration Plant is currentlyunder construction, with start-up of the plant scheduled for the spring of 2005. As part of thepreparations for start-up, the City has continued pilot testing the Ionics/Norit ultrafiltrationsystem since the system's procurement in 2001. The focus of this paper is on the lessons learnedduring this extensive piloting at Minneapolis, and in particular, on the recent piloting results,during which pilot testing was approached with full-scale operations as a control factor. Allexperiments done on the pilot must be capable of being implemented in the full-scale plant. Theend result of the extensive pilot testing has been the development of improved maintenance andrecovery cleaning procedures and modifications to the sequencing of the direct integrity test(DIT), which are being incorporated into the full-scale plant's operational toolbox. The extensive piloting effort at Minneapolis following procurement has afforded the City theopportunity to identify and troubleshoot potential operational issues and make necessarymodifications into the plant design. Such issues can be difficult to identify during short-durationpilot testing (used for the purposes of procurement), particularly with the dynamic nature ofsurface water quality throughout the course of a year. For the Columbia Heights Membrane Plantpilot units, three primary issues were identified during post-procurement pilot testing:what is the "clean" membrane permeability and what is a reasonablepermeability to sustain during normal operation;fouling of the membrane system starting in the spring, during the snowmelt run-off period and lasting sometimes into fall; and,the impacts of the direct integrity test (DIT) on the membranepermeability. Includes reference, table, figures.

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Edition: Vol. - No. Published: 03/01/2005 Number of Pages: 4File Size: 1 file , 600 KB